/*
- * Copyright (c) 2006-2018 Apple Inc. All rights reserved.
+ * Copyright (c) 2006-2019 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <kern/policy_internal.h>
#include <kern/thread_group.h>
-#include <IOKit/IOBSD.h>
-
+#include <corpses/task_corpse.h>
#include <libkern/libkern.h>
#include <mach/coalition.h>
#include <mach/mach_time.h>
#include <sys/wait.h>
#include <sys/tree.h>
#include <sys/priv.h>
+#include <vm/pmap.h>
#include <vm/vm_pageout.h>
#include <vm/vm_protos.h>
+#include <mach/machine/sdt.h>
+#include <libkern/section_keywords.h>
+#include <stdatomic.h>
+
+#include <IOKit/IOBSD.h>
#if CONFIG_FREEZE
#include <vm/vm_map.h>
#endif /* CONFIG_FREEZE */
#include <sys/kern_memorystatus.h>
-
-#include <mach/machine/sdt.h>
-#include <libkern/section_keywords.h>
-#include <stdatomic.h>
+#include <sys/kern_memorystatus_freeze.h>
+#include <sys/kern_memorystatus_notify.h>
/* For logging clarity */
static const char *memorystatus_kill_cause_name[] = {
return "AUDIO_AND_ACCESSORY";
case JETSAM_PRIORITY_CONDUCTOR:
return "CONDUCTOR";
+ case JETSAM_PRIORITY_DRIVER_APPLE:
+ return "DRIVER_APPLE";
case JETSAM_PRIORITY_HOME:
return "HOME";
case JETSAM_PRIORITY_EXECUTIVE:
*/
extern void get_largest_zone_info(char *zone_name, size_t zone_name_len, uint64_t *zone_size);
-/* These are very verbose printfs(), enable with
- * MEMORYSTATUS_DEBUG_LOG
- */
-#if MEMORYSTATUS_DEBUG_LOG
-#define MEMORYSTATUS_DEBUG(cond, format, ...) \
-do { \
- if (cond) { printf(format, ##__VA_ARGS__); } \
-} while(0)
-#else
-#define MEMORYSTATUS_DEBUG(cond, format, ...)
-#endif
-
/*
* Active / Inactive limit support
* proc list must be locked
unsigned long delta_percentage = 5;
unsigned long critical_threshold_percentage = 5;
+// On embedded devices with more than 3GB of memory we lower the critical percentage.
+uint64_t config_jetsam_large_memory_cutoff = 3UL * (1UL << 30);
+unsigned long critical_threshold_percentage_larger_devices = 4;
+unsigned long delta_percentage_larger_devices = 4;
unsigned long idle_offset_percentage = 5;
unsigned long pressure_threshold_percentage = 15;
-unsigned long freeze_threshold_percentage = 50;
unsigned long policy_more_free_offset_percentage = 5;
+unsigned long sysproc_aging_aggr_threshold_percentage = 7;
-/* General memorystatus stuff */
-
-struct klist memorystatus_klist;
-static lck_mtx_t memorystatus_klist_mutex;
+/*
+ * default jetsam snapshot support
+ */
+memorystatus_jetsam_snapshot_t *memorystatus_jetsam_snapshot;
+memorystatus_jetsam_snapshot_t *memorystatus_jetsam_snapshot_copy;
-static void memorystatus_klist_lock(void);
-static void memorystatus_klist_unlock(void);
+#if CONFIG_FREEZE
+memorystatus_jetsam_snapshot_t *memorystatus_jetsam_snapshot_freezer;
+/*
+ * The size of the freezer snapshot is given by memorystatus_jetsam_snapshot_max / JETSAM_SNAPSHOT_FREEZER_MAX_FACTOR
+ * The freezer snapshot can be much smaller than the default snapshot
+ * because it only includes apps that have been killed and dasd consumes it every 30 minutes.
+ * Since the snapshots are always wired we don't want to overallocate too much.
+ */
+#define JETSAM_SNAPSHOT_FREEZER_MAX_FACTOR 20
+unsigned int memorystatus_jetsam_snapshot_freezer_max;
+unsigned int memorystatus_jetsam_snapshot_freezer_size;
+TUNABLE(bool, memorystatus_jetsam_use_freezer_snapshot, "kern.jetsam_user_freezer_snapshot", true);
+#endif /* CONFIG_FREEZE */
-static uint64_t memorystatus_sysprocs_idle_delay_time = 0;
-static uint64_t memorystatus_apps_idle_delay_time = 0;
+unsigned int memorystatus_jetsam_snapshot_count = 0;
+unsigned int memorystatus_jetsam_snapshot_copy_count = 0;
+unsigned int memorystatus_jetsam_snapshot_max = 0;
+unsigned int memorystatus_jetsam_snapshot_size = 0;
+uint64_t memorystatus_jetsam_snapshot_last_timestamp = 0;
+uint64_t memorystatus_jetsam_snapshot_timeout = 0;
+#if DEVELOPMENT || DEBUG
/*
- * Memorystatus kevents
+ * On development and debug kernels, we allow one pid to take ownership
+ * of the memorystatus snapshot (via memorystatus_control).
+ * If there's an owner, then only they may consume the snapshot.
+ * This is used when testing the snapshot interface to avoid racing with other
+ * processes on the system that consume snapshots.
*/
+static pid_t memorystatus_snapshot_owner = 0;
+SYSCTL_INT(_kern, OID_AUTO, memorystatus_snapshot_owner, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_snapshot_owner, 0, "");
+#endif /* DEVELOPMENT || DEBUG */
+static void memorystatus_init_jetsam_snapshot_header(memorystatus_jetsam_snapshot_t *snapshot);
-static int filt_memorystatusattach(struct knote *kn, struct kevent_internal_s *kev);
-static void filt_memorystatusdetach(struct knote *kn);
-static int filt_memorystatus(struct knote *kn, long hint);
-static int filt_memorystatustouch(struct knote *kn, struct kevent_internal_s *kev);
-static int filt_memorystatusprocess(struct knote *kn, struct filt_process_s *data, struct kevent_internal_s *kev);
-
-SECURITY_READ_ONLY_EARLY(struct filterops) memorystatus_filtops = {
- .f_attach = filt_memorystatusattach,
- .f_detach = filt_memorystatusdetach,
- .f_event = filt_memorystatus,
- .f_touch = filt_memorystatustouch,
- .f_process = filt_memorystatusprocess,
-};
+/* General memorystatus stuff */
-enum {
- kMemorystatusNoPressure = 0x1,
- kMemorystatusPressure = 0x2,
- kMemorystatusLowSwap = 0x4,
- kMemorystatusProcLimitWarn = 0x8,
- kMemorystatusProcLimitCritical = 0x10
-};
+uint64_t memorystatus_sysprocs_idle_delay_time = 0;
+uint64_t memorystatus_apps_idle_delay_time = 0;
+/* Some devices give entitled apps a higher memory limit */
+#if __arm64__
+int32_t memorystatus_entitled_max_task_footprint_mb = 0;
+
+#if DEVELOPMENT || DEBUG
+SYSCTL_INT(_kern, OID_AUTO, entitled_max_task_pmem, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_entitled_max_task_footprint_mb, 0, "");
+#endif /* DEVELOPMENT || DEBUG */
+#endif /* __arm64__ */
+
+static lck_grp_attr_t *memorystatus_jetsam_fg_band_lock_grp_attr;
+static lck_grp_t *memorystatus_jetsam_fg_band_lock_grp;
+lck_mtx_t memorystatus_jetsam_fg_band_lock;
/* Idle guard handling */
static int32_t memorystatus_scheduled_idle_demotions_sysprocs = 0;
static int32_t memorystatus_scheduled_idle_demotions_apps = 0;
-static thread_call_t memorystatus_idle_demotion_call;
-
static void memorystatus_perform_idle_demotion(__unused void *spare1, __unused void *spare2);
static void memorystatus_schedule_idle_demotion_locked(proc_t p, boolean_t set_state);
-static void memorystatus_invalidate_idle_demotion_locked(proc_t p, boolean_t clean_state);
static void memorystatus_reschedule_idle_demotion_locked(void);
-
-static void memorystatus_update_priority_locked(proc_t p, int priority, boolean_t head_insert, boolean_t skip_demotion_check);
-
int memorystatus_update_priority_for_appnap(proc_t p, boolean_t is_appnap);
-
vm_pressure_level_t convert_internal_pressure_level_to_dispatch_level(vm_pressure_level_t);
-
boolean_t is_knote_registered_modify_task_pressure_bits(struct knote*, int, task_t, vm_pressure_level_t, vm_pressure_level_t);
void memorystatus_klist_reset_all_for_level(vm_pressure_level_t pressure_level_to_clear);
void memorystatus_send_low_swap_note(void);
+int memorystatus_get_proccnt_upto_priority(int32_t max_bucket_index);
+boolean_t memorystatus_kill_elevated_process(uint32_t cause, os_reason_t jetsam_reason, unsigned int band, int aggr_count,
+ uint32_t *errors, uint64_t *memory_reclaimed);
+uint64_t memorystatus_available_memory_internal(proc_t p);
unsigned int memorystatus_level = 0;
-
static int memorystatus_list_count = 0;
-
-
-#define MEMSTAT_BUCKET_COUNT (JETSAM_PRIORITY_MAX + 1)
-
-typedef struct memstat_bucket {
- TAILQ_HEAD(, proc) list;
- int count;
-} memstat_bucket_t;
-
memstat_bucket_t memstat_bucket[MEMSTAT_BUCKET_COUNT];
-
-int memorystatus_get_proccnt_upto_priority(int32_t max_bucket_index);
-
+static thread_call_t memorystatus_idle_demotion_call;
uint64_t memstat_idle_demotion_deadline = 0;
-
int system_procs_aging_band = JETSAM_PRIORITY_AGING_BAND1;
int applications_aging_band = JETSAM_PRIORITY_IDLE;
#define isProcessInAgingBands(p) ((isSysProc(p) && system_procs_aging_band && (p->p_memstat_effectivepriority == system_procs_aging_band)) || (isApp(p) && applications_aging_band && (p->p_memstat_effectivepriority == applications_aging_band)))
-/*
- * Checking the p_memstat_state almost always requires the proc_list_lock
- * because the jetsam thread could be on the other core changing the state.
- *
- * App -- almost always managed by a system process. Always have dirty tracking OFF. Can include extensions too.
- * System Processes -- not managed by anybody. Always have dirty tracking ON. Can include extensions (here) too.
- */
-#define isApp(p) ((p->p_memstat_state & P_MEMSTAT_MANAGED) || ! (p->p_memstat_dirty & P_DIRTY_TRACK))
-#define isSysProc(p) ( ! (p->p_memstat_state & P_MEMSTAT_MANAGED) || (p->p_memstat_dirty & P_DIRTY_TRACK))
-
#define kJetsamAgingPolicyNone (0)
#define kJetsamAgingPolicyLegacy (1)
#define kJetsamAgingPolicySysProcsReclaimedFirst (2)
#define kJetsamAgingPolicyAppsReclaimedFirst (3)
#define kJetsamAgingPolicyMax kJetsamAgingPolicyAppsReclaimedFirst
-unsigned int jetsam_aging_policy = kJetsamAgingPolicyLegacy;
+unsigned int jetsam_aging_policy = kJetsamAgingPolicySysProcsReclaimedFirst;
extern int corpse_for_fatal_memkill;
-extern unsigned long total_corpses_count(void) __attribute__((pure));
-extern void task_purge_all_corpses(void);
extern uint64_t vm_purgeable_purge_task_owned(task_t task);
boolean_t memorystatus_allowed_vm_map_fork(task_t);
#if DEVELOPMENT || DEBUG
void memorystatus_abort_vm_map_fork(task_t);
#endif
+/*
+ * Idle delay timeout factors for daemons based on relaunch behavior. Only used in
+ * kJetsamAgingPolicySysProcsReclaimedFirst aging policy.
+ */
+#define kJetsamSysProcsIdleDelayTimeLowRatio (5)
+#define kJetsamSysProcsIdleDelayTimeMedRatio (2)
+#define kJetsamSysProcsIdleDelayTimeHighRatio (1)
+static_assert(kJetsamSysProcsIdleDelayTimeLowRatio <= DEFERRED_IDLE_EXIT_TIME_SECS, "sysproc idle delay time for low relaunch daemons would be 0");
+
+/*
+ * For the kJetsamAgingPolicySysProcsReclaimedFirst aging policy, treat apps as well
+ * behaved daemons for aging purposes.
+ */
+#define kJetsamAppsIdleDelayTimeRatio (kJetsamSysProcsIdleDelayTimeLowRatio)
+
+static uint64_t
+memorystatus_sysprocs_idle_time(proc_t p)
+{
+ /*
+ * The kJetsamAgingPolicySysProcsReclaimedFirst aging policy uses the relaunch behavior to
+ * determine the exact idle deferred time provided to the daemons. For all other aging
+ * policies, simply return the default aging idle time.
+ */
+ if (jetsam_aging_policy != kJetsamAgingPolicySysProcsReclaimedFirst) {
+ return memorystatus_sysprocs_idle_delay_time;
+ }
+
+ uint64_t idle_delay_time = 0;
+ /*
+ * For system processes, base the idle delay time on the
+ * jetsam relaunch behavior specified by launchd. The idea
+ * is to provide extra protection to the daemons which would
+ * relaunch immediately after jetsam.
+ */
+ switch (p->p_memstat_relaunch_flags) {
+ case P_MEMSTAT_RELAUNCH_UNKNOWN:
+ case P_MEMSTAT_RELAUNCH_LOW:
+ idle_delay_time = memorystatus_sysprocs_idle_delay_time / kJetsamSysProcsIdleDelayTimeLowRatio;
+ break;
+ case P_MEMSTAT_RELAUNCH_MED:
+ idle_delay_time = memorystatus_sysprocs_idle_delay_time / kJetsamSysProcsIdleDelayTimeMedRatio;
+ break;
+ case P_MEMSTAT_RELAUNCH_HIGH:
+ idle_delay_time = memorystatus_sysprocs_idle_delay_time / kJetsamSysProcsIdleDelayTimeHighRatio;
+ break;
+ default:
+ panic("Unknown relaunch flags on process!");
+ break;
+ }
+ return idle_delay_time;
+}
+
+static uint64_t
+memorystatus_apps_idle_time(__unused proc_t p)
+{
+ /*
+ * For kJetsamAgingPolicySysProcsReclaimedFirst, the Apps are considered as low
+ * relaunch candidates. So only provide limited protection to them. In the other
+ * aging policies, return the default aging idle time.
+ */
+ if (jetsam_aging_policy != kJetsamAgingPolicySysProcsReclaimedFirst) {
+ return memorystatus_apps_idle_delay_time;
+ }
+
+ return memorystatus_apps_idle_delay_time / kJetsamAppsIdleDelayTimeRatio;
+}
+
+
#if 0
/* Keeping around for future use if we need a utility that can do this OR an app that needs a dynamic adjustment. */
uint64_t old_time_in_ns = 0;
absolutetime_to_nanoseconds(memorystatus_sysprocs_idle_delay_time, &old_time_in_ns);
- old_time_in_secs = old_time_in_ns / NSEC_PER_SEC;
+ old_time_in_secs = (int) (old_time_in_ns / NSEC_PER_SEC);
error = sysctl_io_number(req, old_time_in_secs, sizeof(int), &val, NULL);
if (error || !req->newptr) {
uint64_t old_time_in_ns = 0;
absolutetime_to_nanoseconds(memorystatus_apps_idle_delay_time, &old_time_in_ns);
- old_time_in_secs = old_time_in_ns / NSEC_PER_SEC;
+ old_time_in_secs = (int) (old_time_in_ns / NSEC_PER_SEC);
error = sysctl_io_number(req, old_time_in_secs, sizeof(int), &val, NULL);
if (error || !req->newptr) {
SYSCTL_INT(_kern, OID_AUTO, max_task_pmem, CTLFLAG_RD | CTLFLAG_LOCKED | CTLFLAG_MASKED, &max_task_footprint_mb, 0, "");
-#if CONFIG_EMBEDDED
+static int memorystatus_highwater_enabled = 1; /* Update the cached memlimit data. */
+static boolean_t proc_jetsam_state_is_active_locked(proc_t);
+
+#if __arm64__
+int legacy_footprint_bonus_mb = 50; /* This value was chosen after looking at the top 30 apps
+ * that needed the additional room in their footprint when
+ * the 'correct' accounting methods were applied to them.
+ */
-SYSCTL_INT(_kern, OID_AUTO, memorystatus_level, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_level, 0, "");
+#if DEVELOPMENT || DEBUG
+SYSCTL_INT(_kern, OID_AUTO, legacy_footprint_bonus_mb, CTLFLAG_RW | CTLFLAG_LOCKED, &legacy_footprint_bonus_mb, 0, "");
+#endif /* DEVELOPMENT || DEBUG */
+/*
+ * Raise the inactive and active memory limits to new values.
+ * Will only raise the limits and will do nothing if either of the current
+ * limits are 0.
+ * Caller must hold the proc_list_lock
+ */
+static void
+memorystatus_raise_memlimit(proc_t p, int new_memlimit_active, int new_memlimit_inactive)
+{
+ int memlimit_mb_active = 0, memlimit_mb_inactive = 0;
+ boolean_t memlimit_active_is_fatal = FALSE, memlimit_inactive_is_fatal = FALSE, use_active_limit = FALSE;
+
+ LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED);
+
+ if (p->p_memstat_memlimit_active > 0) {
+ memlimit_mb_active = p->p_memstat_memlimit_active;
+ } else if (p->p_memstat_memlimit_active == -1) {
+ memlimit_mb_active = max_task_footprint_mb;
+ } else {
+ /*
+ * Nothing to do for '0' which is
+ * a special value only used internally
+ * to test 'no limits'.
+ */
+ return;
+ }
+
+ if (p->p_memstat_memlimit_inactive > 0) {
+ memlimit_mb_inactive = p->p_memstat_memlimit_inactive;
+ } else if (p->p_memstat_memlimit_inactive == -1) {
+ memlimit_mb_inactive = max_task_footprint_mb;
+ } else {
+ /*
+ * Nothing to do for '0' which is
+ * a special value only used internally
+ * to test 'no limits'.
+ */
+ return;
+ }
+
+ memlimit_mb_active = MAX(new_memlimit_active, memlimit_mb_active);
+ memlimit_mb_inactive = MAX(new_memlimit_inactive, memlimit_mb_inactive);
+
+ memlimit_active_is_fatal = (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_ACTIVE_FATAL);
+ memlimit_inactive_is_fatal = (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_INACTIVE_FATAL);
+
+ SET_ACTIVE_LIMITS_LOCKED(p, memlimit_mb_active, memlimit_active_is_fatal);
+ SET_INACTIVE_LIMITS_LOCKED(p, memlimit_mb_inactive, memlimit_inactive_is_fatal);
+
+ if (proc_jetsam_state_is_active_locked(p) == TRUE) {
+ use_active_limit = TRUE;
+ CACHE_ACTIVE_LIMITS_LOCKED(p, memlimit_active_is_fatal);
+ } else {
+ CACHE_INACTIVE_LIMITS_LOCKED(p, memlimit_inactive_is_fatal);
+ }
+
+ if (memorystatus_highwater_enabled) {
+ task_set_phys_footprint_limit_internal(p->task,
+ (p->p_memstat_memlimit > 0) ? p->p_memstat_memlimit : -1,
+ NULL, /*return old value */
+ use_active_limit, /*active limit?*/
+ (use_active_limit ? memlimit_active_is_fatal : memlimit_inactive_is_fatal));
+ }
+}
+
+void
+memorystatus_act_on_legacy_footprint_entitlement(proc_t p, boolean_t footprint_increase)
+{
+ int memlimit_mb_active = 0, memlimit_mb_inactive = 0;
+
+ if (p == NULL) {
+ return;
+ }
+
+ proc_list_lock();
+
+ if (p->p_memstat_memlimit_active > 0) {
+ memlimit_mb_active = p->p_memstat_memlimit_active;
+ } else if (p->p_memstat_memlimit_active == -1) {
+ memlimit_mb_active = max_task_footprint_mb;
+ } else {
+ /*
+ * Nothing to do for '0' which is
+ * a special value only used internally
+ * to test 'no limits'.
+ */
+ proc_list_unlock();
+ return;
+ }
+
+ if (p->p_memstat_memlimit_inactive > 0) {
+ memlimit_mb_inactive = p->p_memstat_memlimit_inactive;
+ } else if (p->p_memstat_memlimit_inactive == -1) {
+ memlimit_mb_inactive = max_task_footprint_mb;
+ } else {
+ /*
+ * Nothing to do for '0' which is
+ * a special value only used internally
+ * to test 'no limits'.
+ */
+ proc_list_unlock();
+ return;
+ }
+
+ if (footprint_increase) {
+ memlimit_mb_active += legacy_footprint_bonus_mb;
+ memlimit_mb_inactive += legacy_footprint_bonus_mb;
+ } else {
+ memlimit_mb_active -= legacy_footprint_bonus_mb;
+ if (memlimit_mb_active == max_task_footprint_mb) {
+ memlimit_mb_active = -1; /* reverting back to default system limit */
+ }
+
+ memlimit_mb_inactive -= legacy_footprint_bonus_mb;
+ if (memlimit_mb_inactive == max_task_footprint_mb) {
+ memlimit_mb_inactive = -1; /* reverting back to default system limit */
+ }
+ }
+ memorystatus_raise_memlimit(p, memlimit_mb_active, memlimit_mb_inactive);
+
+ proc_list_unlock();
+}
+
+void
+memorystatus_act_on_ios13extended_footprint_entitlement(proc_t p)
+{
+ if (max_mem < 1500ULL * 1024 * 1024 ||
+ max_mem > 2ULL * 1024 * 1024 * 1024) {
+ /* ios13extended_footprint is only for 2GB devices */
+ return;
+ }
+ /* limit to "almost 2GB" */
+ proc_list_lock();
+ memorystatus_raise_memlimit(p, 1800, 1800);
+ proc_list_unlock();
+}
+
+void
+memorystatus_act_on_entitled_task_limit(proc_t p)
+{
+ if (memorystatus_entitled_max_task_footprint_mb == 0) {
+ // Entitlement is not supported on this device.
+ return;
+ }
+ proc_list_lock();
+ memorystatus_raise_memlimit(p, memorystatus_entitled_max_task_footprint_mb, memorystatus_entitled_max_task_footprint_mb);
+ proc_list_unlock();
+}
+#endif /* __arm64__ */
-#endif /* CONFIG_EMBEDDED */
+SYSCTL_INT(_kern, OID_AUTO, memorystatus_level, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_level, 0, "");
int
memorystatus_get_level(__unused struct proc *p, struct memorystatus_get_level_args *args, __unused int *ret)
return 0;
}
-static proc_t memorystatus_get_first_proc_locked(unsigned int *bucket_index, boolean_t search);
-static proc_t memorystatus_get_next_proc_locked(unsigned int *bucket_index, proc_t p, boolean_t search);
-
static void memorystatus_thread(void *param __unused, wait_result_t wr __unused);
/* Memory Limits */
-static int memorystatus_highwater_enabled = 1; /* Update the cached memlimit data. */
-
-static boolean_t proc_jetsam_state_is_active_locked(proc_t);
static boolean_t memorystatus_kill_specific_process(pid_t victim_pid, uint32_t cause, os_reason_t jetsam_reason);
static boolean_t memorystatus_kill_process_sync(pid_t victim_pid, uint32_t cause, os_reason_t jetsam_reason);
static int memorystatus_cmd_get_memlimit_excess_np(pid_t pid, uint32_t flags, user_addr_t buffer, size_t buffer_size, __unused int32_t *retval);
+static void memorystatus_get_memlimit_properties_internal(proc_t p, memorystatus_memlimit_properties_t *p_entry);
+static int memorystatus_set_memlimit_properties_internal(proc_t p, memorystatus_memlimit_properties_t *p_entry);
+
int proc_get_memstat_priority(proc_t, boolean_t);
static boolean_t memorystatus_idle_snapshot = 0;
static uint32_t kill_under_pressure_cause = 0;
-/*
- * default jetsam snapshot support
- */
-static memorystatus_jetsam_snapshot_t *memorystatus_jetsam_snapshot;
-static memorystatus_jetsam_snapshot_t *memorystatus_jetsam_snapshot_copy;
-#define memorystatus_jetsam_snapshot_list memorystatus_jetsam_snapshot->entries
-static unsigned int memorystatus_jetsam_snapshot_count = 0;
-static unsigned int memorystatus_jetsam_snapshot_copy_count = 0;
-static unsigned int memorystatus_jetsam_snapshot_max = 0;
-static unsigned int memorystatus_jetsam_snapshot_size = 0;
-static uint64_t memorystatus_jetsam_snapshot_last_timestamp = 0;
-static uint64_t memorystatus_jetsam_snapshot_timeout = 0;
-#define JETSAM_SNAPSHOT_TIMEOUT_SECS 30
-
/*
* snapshot support for memstats collected at boot.
*/
static void memorystatus_update_jetsam_snapshot_entry_locked(proc_t p, uint32_t kill_cause, uint64_t killtime);
static void memorystatus_clear_errors(void);
-static void memorystatus_get_task_page_counts(task_t task, uint32_t *footprint, uint32_t *max_footprint_lifetime, uint32_t *purgeable_pages);
static void memorystatus_get_task_phys_footprint_page_counts(task_t task,
uint64_t *internal_pages, uint64_t *internal_compressed_pages,
uint64_t *purgeable_nonvolatile_pages, uint64_t *purgeable_nonvolatile_compressed_pages,
uint64_t *alternate_accounting_pages, uint64_t *alternate_accounting_compressed_pages,
- uint64_t *iokit_mapped_pages, uint64_t *page_table_pages);
+ uint64_t *iokit_mapped_pages, uint64_t *page_table_pages, uint64_t *frozen_to_swap_pages);
static void memorystatus_get_task_memory_region_count(task_t task, uint64_t *count);
static uint32_t memorystatus_build_state(proc_t p);
//static boolean_t memorystatus_issue_pressure_kevent(boolean_t pressured);
-static boolean_t memorystatus_kill_top_process(boolean_t any, boolean_t sort_flag, uint32_t cause, os_reason_t jetsam_reason, int32_t *priority, uint32_t *errors);
-static boolean_t memorystatus_kill_top_process_aggressive(uint32_t cause, int aggr_count, int32_t priority_max, uint32_t *errors);
-static boolean_t memorystatus_kill_elevated_process(uint32_t cause, os_reason_t jetsam_reason, unsigned int band, int aggr_count, uint32_t *errors);
-static boolean_t memorystatus_kill_hiwat_proc(uint32_t *errors, boolean_t *purged);
+static boolean_t memorystatus_kill_top_process(boolean_t any, boolean_t sort_flag, uint32_t cause, os_reason_t jetsam_reason, int32_t *priority,
+ uint32_t *errors, uint64_t *memory_reclaimed);
+static boolean_t memorystatus_kill_processes_aggressive(uint32_t cause, int aggr_count, int32_t priority_max, uint32_t *errors, uint64_t *memory_reclaimed);
+static boolean_t memorystatus_kill_hiwat_proc(uint32_t *errors, boolean_t *purged, uint64_t *memory_reclaimed);
static boolean_t memorystatus_kill_process_async(pid_t victim_pid, uint32_t cause);
extern unsigned int vm_page_throttled_count;
extern unsigned int vm_page_purgeable_count;
extern unsigned int vm_page_wire_count;
+extern unsigned int vm_page_speculative_count;
+
+#if CONFIG_JETSAM
+#define MEMORYSTATUS_LOG_AVAILABLE_PAGES memorystatus_available_pages
+#else /* CONFIG_JETSAM */
+#define MEMORYSTATUS_LOG_AVAILABLE_PAGES (vm_page_active_count + vm_page_inactive_count + vm_page_free_count + vm_page_speculative_count)
+#endif /* CONFIG_JETSAM */
#if CONFIG_SECLUDED_MEMORY
extern unsigned int vm_page_secluded_count;
+extern unsigned int vm_page_secluded_count_over_target;
#endif /* CONFIG_SECLUDED_MEMORY */
+/* Aggressive jetsam pages threshold for sysproc aging policy */
+unsigned int memorystatus_sysproc_aging_aggr_pages = 0;
+
#if CONFIG_JETSAM
unsigned int memorystatus_available_pages = (unsigned int)-1;
unsigned int memorystatus_available_pages_pressure = 0;
unsigned int memorystatus_available_pages_critical = 0;
-static unsigned int memorystatus_available_pages_critical_base = 0;
-static unsigned int memorystatus_available_pages_critical_idle_offset = 0;
+unsigned int memorystatus_available_pages_critical_base = 0;
+unsigned int memorystatus_available_pages_critical_idle_offset = 0;
#if DEVELOPMENT || DEBUG
SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_available_pages, 0, "");
/* Callback into vm_compressor.c to signal that thrashing has been mitigated. */
extern void vm_thrashing_jetsam_done(void);
static int memorystatus_cmd_set_jetsam_memory_limit(pid_t pid, int32_t high_water_mark, __unused int32_t *retval, boolean_t is_fatal_limit);
+#if DEVELOPMENT || DEBUG
+static inline uint32_t
+roundToNearestMB(uint32_t in)
+{
+ return (in + ((1 << 20) - 1)) >> 20;
+}
+
+static int memorystatus_cmd_increase_jetsam_task_limit(pid_t pid, uint32_t byte_increase);
+#endif
int32_t max_kill_priority = JETSAM_PRIORITY_MAX;
int32_t max_kill_priority = JETSAM_PRIORITY_IDLE;
#endif /* CONFIG_JETSAM */
-unsigned int memorystatus_frozen_count = 0;
-unsigned int memorystatus_frozen_processes_max = 0;
-unsigned int memorystatus_frozen_shared_mb = 0;
-unsigned int memorystatus_frozen_shared_mb_max = 0;
-unsigned int memorystatus_freeze_shared_mb_per_process_max = 0; /* Max. MB allowed per process to be freezer-eligible. */
-unsigned int memorystatus_freeze_private_shared_pages_ratio = 2; /* Ratio of private:shared pages for a process to be freezer-eligible. */
-unsigned int memorystatus_suspended_count = 0;
-unsigned int memorystatus_thaw_count = 0;
-unsigned int memorystatus_refreeze_eligible_count = 0; /* # of processes currently thawed i.e. have state on disk & in-memory */
-
-#if VM_PRESSURE_EVENTS
-
-boolean_t memorystatus_warn_process(pid_t pid, __unused boolean_t is_active, __unused boolean_t is_fatal, boolean_t exceeded);
-
-vm_pressure_level_t memorystatus_vm_pressure_level = kVMPressureNormal;
-
-/*
- * We use this flag to signal if we have any HWM offenders
- * on the system. This way we can reduce the number of wakeups
- * of the memorystatus_thread when the system is between the
- * "pressure" and "critical" threshold.
- *
- * The (re-)setting of this variable is done without any locks
- * or synchronization simply because it is not possible (currently)
- * to keep track of HWM offenders that drop down below their memory
- * limit and/or exit. So, we choose to burn a couple of wasted wakeups
- * by allowing the unguarded modification of this variable.
- */
-boolean_t memorystatus_hwm_candidates = 0;
-
-static int memorystatus_send_note(int event_code, void *data, size_t data_length);
-
-/*
- * This value is the threshold that a process must meet to be considered for scavenging.
- */
-#if CONFIG_EMBEDDED
-#define VM_PRESSURE_MINIMUM_RSIZE 6 /* MB */
-#else /* CONFIG_EMBEDDED */
-#define VM_PRESSURE_MINIMUM_RSIZE 10 /* MB */
-#endif /* CONFIG_EMBEDDED */
-
-uint32_t vm_pressure_task_footprint_min = VM_PRESSURE_MINIMUM_RSIZE;
-
-#if DEVELOPMENT || DEBUG
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_vm_pressure_task_footprint_min, CTLFLAG_RW | CTLFLAG_LOCKED, &vm_pressure_task_footprint_min, 0, "");
-#endif /* DEVELOPMENT || DEBUG */
-
-#endif /* VM_PRESSURE_EVENTS */
-
-
#if DEVELOPMENT || DEBUG
lck_grp_attr_t *disconnect_page_mappings_lck_grp_attr;
lck_grp_t *disconnect_page_mappings_lck_grp;
static lck_mtx_t disconnect_page_mappings_mutex;
-extern boolean_t kill_on_no_paging_space;
+extern bool kill_on_no_paging_space;
#endif /* DEVELOPMENT || DEBUG */
-/*
- * Table that expresses the probability of a process
- * being used in the next hour.
- */
-typedef struct memorystatus_internal_probabilities {
- char proc_name[MAXCOMLEN + 1];
- int use_probability;
-} memorystatus_internal_probabilities_t;
-
-static memorystatus_internal_probabilities_t *memorystatus_global_probabilities_table = NULL;
-static size_t memorystatus_global_probabilities_size = 0;
-
-/* Freeze */
-
-#if CONFIG_FREEZE
-boolean_t memorystatus_freeze_enabled = FALSE;
-int memorystatus_freeze_wakeup = 0;
-int memorystatus_freeze_jetsam_band = 0; /* the jetsam band which will contain P_MEMSTAT_FROZEN processes */
-
-lck_grp_attr_t *freezer_lck_grp_attr;
-lck_grp_t *freezer_lck_grp;
-static lck_mtx_t freezer_mutex;
-
-static inline boolean_t memorystatus_can_freeze_processes(void);
-static boolean_t memorystatus_can_freeze(boolean_t *memorystatus_freeze_swap_low);
-static boolean_t memorystatus_is_process_eligible_for_freeze(proc_t p);
-static void memorystatus_freeze_thread(void *param __unused, wait_result_t wr __unused);
-static boolean_t memorystatus_freeze_thread_should_run(void);
-
-void memorystatus_disable_freeze(void);
-
-/* Thresholds */
-static unsigned int memorystatus_freeze_threshold = 0;
-
-static unsigned int memorystatus_freeze_pages_min = 0;
-static unsigned int memorystatus_freeze_pages_max = 0;
-
-static unsigned int memorystatus_freeze_suspended_threshold = FREEZE_SUSPENDED_THRESHOLD_DEFAULT;
-
-static unsigned int memorystatus_freeze_daily_mb_max = FREEZE_DAILY_MB_MAX_DEFAULT;
-static uint64_t memorystatus_freeze_budget_pages_remaining = 0; //remaining # of pages that can be frozen to disk
-static boolean_t memorystatus_freeze_degradation = FALSE; //protected by the freezer mutex. Signals we are in a degraded freeze mode.
-
-static unsigned int memorystatus_max_frozen_demotions_daily = 0;
-static unsigned int memorystatus_thaw_count_demotion_threshold = 0;
-
-/* Stats */
-static uint64_t memorystatus_freeze_pageouts = 0;
-
-/* Throttling */
-#define DEGRADED_WINDOW_MINS (30)
-#define NORMAL_WINDOW_MINS (24 * 60)
-
-static throttle_interval_t throttle_intervals[] = {
- { DEGRADED_WINDOW_MINS, 1, 0, 0, { 0, 0 }},
- { NORMAL_WINDOW_MINS, 1, 0, 0, { 0, 0 }},
-};
-throttle_interval_t *degraded_throttle_window = &throttle_intervals[0];
-throttle_interval_t *normal_throttle_window = &throttle_intervals[1];
-
-extern uint64_t vm_swap_get_free_space(void);
-extern boolean_t vm_swap_max_budget(uint64_t *);
-
-static void memorystatus_freeze_update_throttle(uint64_t *budget_pages_allowed);
-
-static uint64_t memorystatus_freezer_thread_next_run_ts = 0;
-
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_count, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_frozen_count, 0, "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_thaw_count, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_thaw_count, 0, "");
-SYSCTL_QUAD(_kern, OID_AUTO, memorystatus_freeze_pageouts, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_freeze_pageouts, "");
-SYSCTL_QUAD(_kern, OID_AUTO, memorystatus_freeze_budget_pages_remaining, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_freeze_budget_pages_remaining, "");
-
-#endif /* CONFIG_FREEZE */
-
/* Debug */
extern struct knote *vm_find_knote_from_pid(pid_t, struct klist *);
*/
printf("memorystatus_debug_dump ***START*(PAGE_SIZE_64=%llu)**\n", PAGE_SIZE_64);
- printf("bucket [pid] [pages / MB] [state] [EP / RP] dirty deadline [L-limit / C-limit / A-limit / IA-limit] name\n");
+ printf("bucket [pid] [pages / MB] [state] [EP / RP / AP] dirty deadline [L-limit / C-limit / A-limit / IA-limit] name\n");
p = memorystatus_get_first_proc_locked(&b, traverse_all_buckets);
while (p) {
bytes = get_task_phys_footprint(p->task);
task_get_phys_footprint_limit(p->task, &ledger_limit);
- printf("%2d [%5d] [%5lld /%3lldMB] 0x%-8x [%2d / %2d] 0x%-3x %10lld [%3d / %3d%s / %3d%s / %3d%s] %s\n",
+ printf("%2d [%5d] [%5lld /%3lldMB] 0x%-8x [%2d / %2d / %2d] 0x%-3x %10lld [%3d / %3d%s / %3d%s / %3d%s] %s\n",
b, p->p_pid,
(bytes / PAGE_SIZE_64), /* task's footprint converted from bytes to pages */
(bytes / (1024ULL * 1024ULL)), /* task's footprint converted from bytes to MB */
- p->p_memstat_state, p->p_memstat_effectivepriority, p->p_memstat_requestedpriority, p->p_memstat_dirty, p->p_memstat_idledeadline,
+ p->p_memstat_state, p->p_memstat_effectivepriority, p->p_memstat_requestedpriority, p->p_memstat_assertionpriority,
+ p->p_memstat_dirty, p->p_memstat_idledeadline,
ledger_limit,
p->p_memstat_memlimit,
(p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT ? "F " : "NF"),
SYSCTL_PROC(_kern, OID_AUTO, memorystatus_highwater_enabled, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_highwater_enabled, 0, sysctl_memorystatus_highwater_enable, "I", "");
-#if VM_PRESSURE_EVENTS
+SYSCTL_INT(_kern, OID_AUTO, memorystatus_idle_snapshot, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_idle_snapshot, 0, "");
-/*
- * This routine is used for targeted notifications regardless of system memory pressure
- * and regardless of whether or not the process has already been notified.
- * It bypasses and has no effect on the only-one-notification per soft-limit policy.
- *
- * "memnote" is the current user.
- */
+#if CONFIG_JETSAM
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_available_pages_critical, 0, "");
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical_base, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_available_pages_critical_base, 0, "");
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical_idle_offset, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_available_pages_critical_idle_offset, 0, "");
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_policy_more_free_offset_pages, CTLFLAG_RW, &memorystatus_policy_more_free_offset_pages, 0, "");
-static int
-sysctl_memorystatus_vm_pressure_send SYSCTL_HANDLER_ARGS
-{
-#pragma unused(arg1, arg2)
+static unsigned int memorystatus_jetsam_panic_debug = 0;
- int error = 0, pid = 0;
- struct knote *kn = NULL;
- boolean_t found_knote = FALSE;
- int fflags = 0; /* filter flags for EVFILT_MEMORYSTATUS */
- uint64_t value = 0;
+#if VM_PRESSURE_EVENTS
- error = sysctl_handle_quad(oidp, &value, 0, req);
- if (error || !req->newptr) {
- return error;
- }
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_pressure, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_available_pages_pressure, 0, "");
- /*
- * Find the pid in the low 32 bits of value passed in.
- */
- pid = (int)(value & 0xFFFFFFFF);
+#endif /* VM_PRESSURE_EVENTS */
- /*
- * Find notification in the high 32 bits of the value passed in.
- */
- fflags = (int)((value >> 32) & 0xFFFFFFFF);
+#endif /* CONFIG_JETSAM */
- /*
- * For backwards compatibility, when no notification is
- * passed in, default to the NOTE_MEMORYSTATUS_PRESSURE_WARN
- */
- if (fflags == 0) {
- fflags = NOTE_MEMORYSTATUS_PRESSURE_WARN;
- // printf("memorystatus_vm_pressure_send: using default notification [0x%x]\n", fflags);
- }
+#endif /* DEVELOPMENT || DEBUG */
- /*
- * See event.h ... fflags for EVFILT_MEMORYSTATUS
- */
- if (!((fflags == NOTE_MEMORYSTATUS_PRESSURE_NORMAL) ||
- (fflags == NOTE_MEMORYSTATUS_PRESSURE_WARN) ||
- (fflags == NOTE_MEMORYSTATUS_PRESSURE_CRITICAL) ||
- (fflags == NOTE_MEMORYSTATUS_LOW_SWAP) ||
- (fflags == NOTE_MEMORYSTATUS_PROC_LIMIT_WARN) ||
- (fflags == NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL) ||
- (((fflags & NOTE_MEMORYSTATUS_MSL_STATUS) != 0 &&
- ((fflags & ~NOTE_MEMORYSTATUS_MSL_STATUS) == 0))))) {
- printf("memorystatus_vm_pressure_send: notification [0x%x] not supported \n", fflags);
- error = 1;
+extern kern_return_t kernel_thread_start_priority(thread_continue_t continuation,
+ void *parameter,
+ integer_t priority,
+ thread_t *new_thread);
+
+#if DEVELOPMENT || DEBUG
+
+static int
+sysctl_memorystatus_disconnect_page_mappings SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2)
+ int error = 0, pid = 0;
+ proc_t p;
+
+ error = sysctl_handle_int(oidp, &pid, 0, req);
+ if (error || !req->newptr) {
return error;
}
- /*
- * Forcibly send pid a memorystatus notification.
- */
+ lck_mtx_lock(&disconnect_page_mappings_mutex);
+
+ if (pid == -1) {
+ vm_pageout_disconnect_all_pages();
+ } else {
+ p = proc_find(pid);
- memorystatus_klist_lock();
+ if (p != NULL) {
+ error = task_disconnect_page_mappings(p->task);
- SLIST_FOREACH(kn, &memorystatus_klist, kn_selnext) {
- proc_t knote_proc = knote_get_kq(kn)->kq_p;
- pid_t knote_pid = knote_proc->p_pid;
+ proc_rele(p);
- if (knote_pid == pid) {
- /*
- * Forcibly send this pid a memorystatus notification.
- */
- kn->kn_fflags = fflags;
- found_knote = TRUE;
+ if (error) {
+ error = EIO;
+ }
+ } else {
+ error = EINVAL;
}
}
-
- if (found_knote) {
- KNOTE(&memorystatus_klist, 0);
- printf("memorystatus_vm_pressure_send: (value 0x%llx) notification [0x%x] sent to process [%d] \n", value, fflags, pid);
- error = 0;
- } else {
- printf("memorystatus_vm_pressure_send: (value 0x%llx) notification [0x%x] not sent to process [%d] (none registered?)\n", value, fflags, pid);
- error = 1;
- }
-
- memorystatus_klist_unlock();
+ lck_mtx_unlock(&disconnect_page_mappings_mutex);
return error;
}
-SYSCTL_PROC(_kern, OID_AUTO, memorystatus_vm_pressure_send, CTLTYPE_QUAD | CTLFLAG_WR | CTLFLAG_LOCKED | CTLFLAG_MASKED,
- 0, 0, &sysctl_memorystatus_vm_pressure_send, "Q", "");
-
-#endif /* VM_PRESSURE_EVENTS */
-
-SYSCTL_INT(_kern, OID_AUTO, memorystatus_idle_snapshot, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_idle_snapshot, 0, "");
-
-#if CONFIG_JETSAM
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_available_pages_critical, 0, "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical_base, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_available_pages_critical_base, 0, "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical_idle_offset, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_available_pages_critical_idle_offset, 0, "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_policy_more_free_offset_pages, CTLFLAG_RW, &memorystatus_policy_more_free_offset_pages, 0, "");
-
-static unsigned int memorystatus_jetsam_panic_debug = 0;
-static unsigned int memorystatus_jetsam_policy_offset_pages_diagnostic = 0;
+SYSCTL_PROC(_kern, OID_AUTO, memorystatus_disconnect_page_mappings, CTLTYPE_INT | CTLFLAG_WR | CTLFLAG_LOCKED | CTLFLAG_MASKED,
+ 0, 0, &sysctl_memorystatus_disconnect_page_mappings, "I", "");
-/* Diagnostic code */
+#endif /* DEVELOPMENT || DEBUG */
-enum {
- kJetsamDiagnosticModeNone = 0,
- kJetsamDiagnosticModeAll = 1,
- kJetsamDiagnosticModeStopAtFirstActive = 2,
- kJetsamDiagnosticModeCount
-} jetsam_diagnostic_mode = kJetsamDiagnosticModeNone;
+/*
+ * Sorts the given bucket.
+ *
+ * Input:
+ * bucket_index - jetsam priority band to be sorted.
+ * sort_order - JETSAM_SORT_xxx from kern_memorystatus.h
+ * Currently sort_order is only meaningful when handling
+ * coalitions.
+ *
+ * proc_list_lock must be held by the caller.
+ */
+static void
+memorystatus_sort_bucket_locked(unsigned int bucket_index, int sort_order)
+{
+ LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED);
+ if (memstat_bucket[bucket_index].count == 0) {
+ return;
+ }
-static int jetsam_diagnostic_suspended_one_active_proc = 0;
+ switch (bucket_index) {
+ case JETSAM_PRIORITY_FOREGROUND:
+ if (memorystatus_sort_by_largest_coalition_locked(bucket_index, sort_order) == 0) {
+ /*
+ * Fall back to per process sorting when zero coalitions are found.
+ */
+ memorystatus_sort_by_largest_process_locked(bucket_index);
+ }
+ break;
+ default:
+ memorystatus_sort_by_largest_process_locked(bucket_index);
+ break;
+ }
+}
+/*
+ * Picks the sorting routine for a given jetsam priority band.
+ *
+ * Input:
+ * bucket_index - jetsam priority band to be sorted.
+ * sort_order - JETSAM_SORT_xxx from kern_memorystatus.h
+ * Currently sort_order is only meaningful when handling
+ * coalitions.
+ *
+ * Return:
+ * 0 on success
+ * non-0 on failure
+ */
static int
-sysctl_jetsam_diagnostic_mode SYSCTL_HANDLER_ARGS
+memorystatus_sort_bucket(unsigned int bucket_index, int sort_order)
{
-#pragma unused(arg1, arg2)
-
- const char *diagnosticStrings[] = {
- "jetsam: diagnostic mode: resetting critical level.",
- "jetsam: diagnostic mode: will examine all processes",
- "jetsam: diagnostic mode: will stop at first active process"
- };
+ int coal_sort_order;
- int error, val = jetsam_diagnostic_mode;
- boolean_t changed = FALSE;
+ /*
+ * Verify the jetsam priority
+ */
+ if (bucket_index >= MEMSTAT_BUCKET_COUNT) {
+ return EINVAL;
+ }
- error = sysctl_handle_int(oidp, &val, 0, req);
- if (error || !req->newptr) {
- return error;
+#if DEVELOPMENT || DEBUG
+ if (sort_order == JETSAM_SORT_DEFAULT) {
+ coal_sort_order = COALITION_SORT_DEFAULT;
+ } else {
+ coal_sort_order = sort_order; /* only used for testing scenarios */
}
- if ((val < 0) || (val >= kJetsamDiagnosticModeCount)) {
- printf("jetsam: diagnostic mode: invalid value - %d\n", val);
+#else
+ /* Verify default */
+ if (sort_order == JETSAM_SORT_DEFAULT) {
+ coal_sort_order = COALITION_SORT_DEFAULT;
+ } else {
return EINVAL;
}
+#endif
proc_list_lock();
+ memorystatus_sort_bucket_locked(bucket_index, coal_sort_order);
+ proc_list_unlock();
- if ((unsigned int) val != jetsam_diagnostic_mode) {
- jetsam_diagnostic_mode = val;
+ return 0;
+}
- memorystatus_jetsam_policy &= ~kPolicyDiagnoseActive;
+/*
+ * Sort processes by size for a single jetsam bucket.
+ */
- switch (jetsam_diagnostic_mode) {
- case kJetsamDiagnosticModeNone:
- /* Already cleared */
- break;
- case kJetsamDiagnosticModeAll:
- memorystatus_jetsam_policy |= kPolicyDiagnoseAll;
- break;
- case kJetsamDiagnosticModeStopAtFirstActive:
- memorystatus_jetsam_policy |= kPolicyDiagnoseFirst;
- break;
- default:
- /* Already validated */
- break;
- }
+static void
+memorystatus_sort_by_largest_process_locked(unsigned int bucket_index)
+{
+ proc_t p = NULL, insert_after_proc = NULL, max_proc = NULL;
+ proc_t next_p = NULL, prev_max_proc = NULL;
+ uint32_t pages = 0, max_pages = 0;
+ memstat_bucket_t *current_bucket;
- memorystatus_update_levels_locked(FALSE);
- changed = TRUE;
+ if (bucket_index >= MEMSTAT_BUCKET_COUNT) {
+ return;
}
- proc_list_unlock();
+ current_bucket = &memstat_bucket[bucket_index];
- if (changed) {
- printf("%s\n", diagnosticStrings[val]);
- }
+ p = TAILQ_FIRST(¤t_bucket->list);
- return 0;
-}
+ while (p) {
+ memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL);
+ max_pages = pages;
+ max_proc = p;
+ prev_max_proc = p;
-SYSCTL_PROC(_debug, OID_AUTO, jetsam_diagnostic_mode, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_ANYBODY,
- &jetsam_diagnostic_mode, 0, sysctl_jetsam_diagnostic_mode, "I", "Jetsam Diagnostic Mode");
+ while ((next_p = TAILQ_NEXT(p, p_memstat_list)) != NULL) {
+ /* traversing list until we find next largest process */
+ p = next_p;
+ memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL);
+ if (pages > max_pages) {
+ max_pages = pages;
+ max_proc = p;
+ }
+ }
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_jetsam_policy_offset_pages_diagnostic, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_jetsam_policy_offset_pages_diagnostic, 0, "");
+ if (prev_max_proc != max_proc) {
+ /* found a larger process, place it in the list */
+ TAILQ_REMOVE(¤t_bucket->list, max_proc, p_memstat_list);
+ if (insert_after_proc == NULL) {
+ TAILQ_INSERT_HEAD(¤t_bucket->list, max_proc, p_memstat_list);
+ } else {
+ TAILQ_INSERT_AFTER(¤t_bucket->list, insert_after_proc, max_proc, p_memstat_list);
+ }
+ prev_max_proc = max_proc;
+ }
-#if VM_PRESSURE_EVENTS
+ insert_after_proc = max_proc;
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_pressure, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_available_pages_pressure, 0, "");
+ p = TAILQ_NEXT(max_proc, p_memstat_list);
+ }
+}
-#endif /* VM_PRESSURE_EVENTS */
+proc_t
+memorystatus_get_first_proc_locked(unsigned int *bucket_index, boolean_t search)
+{
+ memstat_bucket_t *current_bucket;
+ proc_t next_p;
-#endif /* CONFIG_JETSAM */
+ if ((*bucket_index) >= MEMSTAT_BUCKET_COUNT) {
+ return NULL;
+ }
-#if CONFIG_FREEZE
+ current_bucket = &memstat_bucket[*bucket_index];
+ next_p = TAILQ_FIRST(¤t_bucket->list);
+ if (!next_p && search) {
+ while (!next_p && (++(*bucket_index) < MEMSTAT_BUCKET_COUNT)) {
+ current_bucket = &memstat_bucket[*bucket_index];
+ next_p = TAILQ_FIRST(¤t_bucket->list);
+ }
+ }
+
+ return next_p;
+}
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_jetsam_band, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_freeze_jetsam_band, 0, "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_daily_mb_max, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_freeze_daily_mb_max, 0, "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_degraded_mode, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_freeze_degradation, 0, "");
+proc_t
+memorystatus_get_next_proc_locked(unsigned int *bucket_index, proc_t p, boolean_t search)
+{
+ memstat_bucket_t *current_bucket;
+ proc_t next_p;
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_threshold, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_freeze_threshold, 0, "");
+ if (!p || ((*bucket_index) >= MEMSTAT_BUCKET_COUNT)) {
+ return NULL;
+ }
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_pages_min, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_freeze_pages_min, 0, "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_pages_max, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_freeze_pages_max, 0, "");
+ next_p = TAILQ_NEXT(p, p_memstat_list);
+ while (!next_p && search && (++(*bucket_index) < MEMSTAT_BUCKET_COUNT)) {
+ current_bucket = &memstat_bucket[*bucket_index];
+ next_p = TAILQ_FIRST(¤t_bucket->list);
+ }
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_refreeze_eligible_count, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_refreeze_eligible_count, 0, "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_processes_max, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_frozen_processes_max, 0, "");
+ return next_p;
+}
/*
- * Max. shared-anonymous memory in MB that can be held by frozen processes in the high jetsam band.
- * "0" means no limit.
- * Default is 10% of system-wide task limit.
+ * Structure to hold state for a jetsam thread.
+ * Typically there should be a single jetsam thread
+ * unless parallel jetsam is enabled.
*/
+struct jetsam_thread_state {
+ uint8_t inited; /* boolean - if the thread is initialized */
+ uint8_t limit_to_low_bands; /* boolean */
+ int memorystatus_wakeup; /* wake channel */
+ int index; /* jetsam thread index */
+ thread_t thread; /* jetsam thread pointer */
+} *jetsam_threads;
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_shared_mb_max, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_frozen_shared_mb_max, 0, "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_shared_mb, CTLFLAG_RD | CTLFLAG_LOCKED, &memorystatus_frozen_shared_mb, 0, "");
+/* Maximum number of jetsam threads allowed */
+#define JETSAM_THREADS_LIMIT 3
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_shared_mb_per_process_max, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_freeze_shared_mb_per_process_max, 0, "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_private_shared_pages_ratio, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_freeze_private_shared_pages_ratio, 0, "");
+/* Number of active jetsam threads */
+_Atomic int active_jetsam_threads = 1;
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_min_processes, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_freeze_suspended_threshold, 0, "");
+/* Number of maximum jetsam threads configured */
+int max_jetsam_threads = JETSAM_THREADS_LIMIT;
/*
- * max. # of frozen process demotions we will allow in our daily cycle.
- */
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_max_freeze_demotions_daily, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_max_frozen_demotions_daily, 0, "");
-/*
- * min # of thaws needed by a process to protect it from getting demoted into the IDLE band.
+ * Global switch for enabling fast jetsam. Fast jetsam is
+ * hooked up via the system_override() system call. It has the
+ * following effects:
+ * - Raise the jetsam threshold ("clear-the-deck")
+ * - Enabled parallel jetsam on eligible devices
*/
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_thaw_count_demotion_threshold, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_thaw_count_demotion_threshold, 0, "");
-
-boolean_t memorystatus_freeze_throttle_enabled = TRUE;
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_throttle_enabled, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_freeze_throttle_enabled, 0, "");
+#if __AMP__
+int fast_jetsam_enabled = 1;
+#else /* __AMP__ */
+int fast_jetsam_enabled = 0;
+#endif /* __AMP__ */
-/*
- * When set to true, this keeps frozen processes in the compressor pool in memory, instead of swapping them out to disk.
- * Exposed via the sysctl kern.memorystatus_freeze_to_memory.
- */
-boolean_t memorystatus_freeze_to_memory = FALSE;
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_to_memory, CTLFLAG_RW | CTLFLAG_LOCKED, &memorystatus_freeze_to_memory, 0, "");
+#if CONFIG_DIRTYSTATUS_TRACKING
+int dirtystatus_tracking_enabled = 0;
+SYSCTL_INT(_kern, OID_AUTO, dirtystatus_tracking_enabled, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &dirtystatus_tracking_enabled, 0, "");
+#endif
-#define VM_PAGES_FOR_ALL_PROCS (2)
-/*
- * Manual trigger of freeze and thaw for dev / debug kernels only.
- */
-static int
-sysctl_memorystatus_freeze SYSCTL_HANDLER_ARGS
+/* Routine to find the jetsam state structure for the current jetsam thread */
+static inline struct jetsam_thread_state *
+jetsam_current_thread(void)
{
-#pragma unused(arg1, arg2)
- int error, pid = 0;
- proc_t p;
- int freezer_error_code = 0;
-
- if (memorystatus_freeze_enabled == FALSE) {
- printf("sysctl_freeze: Freeze is DISABLED\n");
- return ENOTSUP;
+ for (int thr_id = 0; thr_id < max_jetsam_threads; thr_id++) {
+ if (jetsam_threads[thr_id].thread == current_thread()) {
+ return &(jetsam_threads[thr_id]);
+ }
}
+ return NULL;
+}
- error = sysctl_handle_int(oidp, &pid, 0, req);
- if (error || !req->newptr) {
- return error;
- }
- if (pid == VM_PAGES_FOR_ALL_PROCS) {
- vm_pageout_anonymous_pages();
+__private_extern__ void
+memorystatus_init(void)
+{
+ kern_return_t result;
+ int i;
- return 0;
- }
+#if CONFIG_FREEZE
+ memorystatus_freeze_jetsam_band = JETSAM_PRIORITY_UI_SUPPORT;
+ memorystatus_frozen_processes_max = FREEZE_PROCESSES_MAX;
+ memorystatus_frozen_shared_mb_max = ((MAX_FROZEN_SHARED_MB_PERCENT * max_task_footprint_mb) / 100); /* 10% of the system wide task limit */
+ memorystatus_freeze_shared_mb_per_process_max = (memorystatus_frozen_shared_mb_max / 4);
+ memorystatus_freeze_pages_min = FREEZE_PAGES_MIN;
+ memorystatus_freeze_pages_max = FREEZE_PAGES_MAX;
+ memorystatus_max_frozen_demotions_daily = MAX_FROZEN_PROCESS_DEMOTIONS;
+ memorystatus_thaw_count_demotion_threshold = MIN_THAW_DEMOTION_THRESHOLD;
+#endif
- lck_mtx_lock(&freezer_mutex);
+#if DEVELOPMENT || DEBUG
+ disconnect_page_mappings_lck_grp_attr = lck_grp_attr_alloc_init();
+ disconnect_page_mappings_lck_grp = lck_grp_alloc_init("disconnect_page_mappings", disconnect_page_mappings_lck_grp_attr);
- p = proc_find(pid);
- if (p != NULL) {
- uint32_t purgeable, wired, clean, dirty, shared;
- uint32_t max_pages = 0, state = 0;
+ lck_mtx_init(&disconnect_page_mappings_mutex, disconnect_page_mappings_lck_grp, NULL);
- if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
- /*
- * Freezer backed by the compressor and swap file(s)
- * will hold compressed data.
- *
- * Set the sysctl kern.memorystatus_freeze_to_memory to true to keep compressed data from
- * being swapped out to disk. Note that this disables freezer swap support globally,
- * not just for the process being frozen.
- *
- *
- * We don't care about the global freezer budget or the process's (min/max) budget here.
- * The freeze sysctl is meant to force-freeze a process.
- *
- * We also don't update any global or process stats on this path, so that the jetsam/ freeze
- * logic remains unaffected. The tasks we're performing here are: freeze the process, set the
- * P_MEMSTAT_FROZEN bit, and elevate the process to a higher band (if the freezer is active).
- */
- max_pages = memorystatus_freeze_pages_max;
- } else {
- /*
- * We only have the compressor without any swap.
- */
- max_pages = UINT32_MAX - 1;
- }
+ if (kill_on_no_paging_space) {
+ max_kill_priority = JETSAM_PRIORITY_MAX;
+ }
+#endif
- proc_list_lock();
- state = p->p_memstat_state;
- proc_list_unlock();
+ memorystatus_jetsam_fg_band_lock_grp_attr = lck_grp_attr_alloc_init();
+ memorystatus_jetsam_fg_band_lock_grp =
+ lck_grp_alloc_init("memorystatus_jetsam_fg_band", memorystatus_jetsam_fg_band_lock_grp_attr);
+ lck_mtx_init(&memorystatus_jetsam_fg_band_lock, memorystatus_jetsam_fg_band_lock_grp, NULL);
- /*
- * The jetsam path also verifies that the process is a suspended App. We don't care about that here.
- * We simply ensure that jetsam is not already working on the process and that the process has not
- * explicitly disabled freezing.
- */
- if (state & (P_MEMSTAT_TERMINATED | P_MEMSTAT_LOCKED | P_MEMSTAT_FREEZE_DISABLED)) {
- printf("sysctl_freeze: p_memstat_state check failed, process is%s%s%s\n",
- (state & P_MEMSTAT_TERMINATED) ? " terminated" : "",
- (state & P_MEMSTAT_LOCKED) ? " locked" : "",
- (state & P_MEMSTAT_FREEZE_DISABLED) ? " unfreezable" : "");
+ /* Init buckets */
+ for (i = 0; i < MEMSTAT_BUCKET_COUNT; i++) {
+ TAILQ_INIT(&memstat_bucket[i].list);
+ memstat_bucket[i].count = 0;
+ memstat_bucket[i].relaunch_high_count = 0;
+ }
+ memorystatus_idle_demotion_call = thread_call_allocate((thread_call_func_t)memorystatus_perform_idle_demotion, NULL);
- proc_rele(p);
- lck_mtx_unlock(&freezer_mutex);
- return EPERM;
- }
+ nanoseconds_to_absolutetime((uint64_t)DEFERRED_IDLE_EXIT_TIME_SECS * NSEC_PER_SEC, &memorystatus_sysprocs_idle_delay_time);
+ nanoseconds_to_absolutetime((uint64_t)DEFERRED_IDLE_EXIT_TIME_SECS * NSEC_PER_SEC, &memorystatus_apps_idle_delay_time);
- error = task_freeze(p->task, &purgeable, &wired, &clean, &dirty, max_pages, &shared, &freezer_error_code, FALSE /* eval only */);
+#if CONFIG_JETSAM
+ /* Apply overrides */
+ if (!PE_parse_boot_argn("kern.jetsam_delta", &delta_percentage, sizeof(delta_percentage))) {
+ PE_get_default("kern.jetsam_delta", &delta_percentage, sizeof(delta_percentage));
+ }
+ if (delta_percentage == 0) {
+ delta_percentage = 5;
+ }
+ if (max_mem > config_jetsam_large_memory_cutoff) {
+ critical_threshold_percentage = critical_threshold_percentage_larger_devices;
+ delta_percentage = delta_percentage_larger_devices;
+ }
+ assert(delta_percentage < 100);
+ if (!PE_parse_boot_argn("kern.jetsam_critical_threshold", &critical_threshold_percentage, sizeof(critical_threshold_percentage))) {
+ PE_get_default("kern.jetsam_critical_threshold", &critical_threshold_percentage, sizeof(critical_threshold_percentage));
+ }
+ assert(critical_threshold_percentage < 100);
+ PE_get_default("kern.jetsam_idle_offset", &idle_offset_percentage, sizeof(idle_offset_percentage));
+ assert(idle_offset_percentage < 100);
+ PE_get_default("kern.jetsam_pressure_threshold", &pressure_threshold_percentage, sizeof(pressure_threshold_percentage));
+ assert(pressure_threshold_percentage < 100);
+ PE_get_default("kern.jetsam_freeze_threshold", &freeze_threshold_percentage, sizeof(freeze_threshold_percentage));
+ assert(freeze_threshold_percentage < 100);
- if (error) {
- char reason[128];
- if (freezer_error_code == FREEZER_ERROR_EXCESS_SHARED_MEMORY) {
- strlcpy(reason, "too much shared memory", 128);
- }
- if (freezer_error_code == FREEZER_ERROR_LOW_PRIVATE_SHARED_RATIO) {
- strlcpy(reason, "low private-shared pages ratio", 128);
- }
+ if (!PE_parse_boot_argn("jetsam_aging_policy", &jetsam_aging_policy,
+ sizeof(jetsam_aging_policy))) {
+ if (!PE_get_default("kern.jetsam_aging_policy", &jetsam_aging_policy,
+ sizeof(jetsam_aging_policy))) {
+ jetsam_aging_policy = kJetsamAgingPolicySysProcsReclaimedFirst;
+ }
+ }
- if (freezer_error_code == FREEZER_ERROR_NO_COMPRESSOR_SPACE) {
- strlcpy(reason, "no compressor space", 128);
- }
+ if (jetsam_aging_policy > kJetsamAgingPolicyMax) {
+ jetsam_aging_policy = kJetsamAgingPolicySysProcsReclaimedFirst;
+ }
- if (freezer_error_code == FREEZER_ERROR_NO_SWAP_SPACE) {
- strlcpy(reason, "no swap space", 128);
- }
+ switch (jetsam_aging_policy) {
+ case kJetsamAgingPolicyNone:
+ system_procs_aging_band = JETSAM_PRIORITY_IDLE;
+ applications_aging_band = JETSAM_PRIORITY_IDLE;
+ break;
- printf("sysctl_freeze: task_freeze failed: %s\n", reason);
+ case kJetsamAgingPolicyLegacy:
+ /*
+ * Legacy behavior where some daemons get a 10s protection once
+ * AND only before the first clean->dirty->clean transition before
+ * going into IDLE band.
+ */
+ system_procs_aging_band = JETSAM_PRIORITY_AGING_BAND1;
+ applications_aging_band = JETSAM_PRIORITY_IDLE;
+ break;
- if (error == KERN_NO_SPACE) {
- /* Make it easy to distinguish between failures due to low compressor/ swap space and other failures. */
- error = ENOSPC;
- } else {
- error = EIO;
- }
- } else {
- proc_list_lock();
- if ((p->p_memstat_state & P_MEMSTAT_FROZEN) == 0) {
- p->p_memstat_state |= P_MEMSTAT_FROZEN;
- memorystatus_frozen_count++;
- }
- p->p_memstat_frozen_count++;
+ case kJetsamAgingPolicySysProcsReclaimedFirst:
+ system_procs_aging_band = JETSAM_PRIORITY_AGING_BAND1;
+ applications_aging_band = JETSAM_PRIORITY_AGING_BAND2;
+ break;
+ case kJetsamAgingPolicyAppsReclaimedFirst:
+ system_procs_aging_band = JETSAM_PRIORITY_AGING_BAND2;
+ applications_aging_band = JETSAM_PRIORITY_AGING_BAND1;
+ break;
- proc_list_unlock();
+ default:
+ break;
+ }
- if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
- /*
- * We elevate only if we are going to swap out the data.
- */
- error = memorystatus_update_inactive_jetsam_priority_band(pid, MEMORYSTATUS_CMD_ELEVATED_INACTIVEJETSAMPRIORITY_ENABLE,
- memorystatus_freeze_jetsam_band, TRUE);
+ /*
+ * The aging bands cannot overlap with the JETSAM_PRIORITY_ELEVATED_INACTIVE
+ * band and must be below it in priority. This is so that we don't have to make
+ * our 'aging' code worry about a mix of processes, some of which need to age
+ * and some others that need to stay elevated in the jetsam bands.
+ */
+ assert(JETSAM_PRIORITY_ELEVATED_INACTIVE > system_procs_aging_band);
+ assert(JETSAM_PRIORITY_ELEVATED_INACTIVE > applications_aging_band);
- if (error) {
- printf("sysctl_freeze: Elevating frozen process to higher jetsam band failed with %d\n", error);
- }
- }
- }
+ /* Take snapshots for idle-exit kills by default? First check the boot-arg... */
+ if (!PE_parse_boot_argn("jetsam_idle_snapshot", &memorystatus_idle_snapshot, sizeof(memorystatus_idle_snapshot))) {
+ /* ...no boot-arg, so check the device tree */
+ PE_get_default("kern.jetsam_idle_snapshot", &memorystatus_idle_snapshot, sizeof(memorystatus_idle_snapshot));
+ }
- proc_rele(p);
+ memorystatus_delta = (unsigned int) (delta_percentage * atop_64(max_mem) / 100);
+ memorystatus_available_pages_critical_idle_offset = (unsigned int) (idle_offset_percentage * atop_64(max_mem) / 100);
+ memorystatus_available_pages_critical_base = (unsigned int) ((critical_threshold_percentage / delta_percentage) * memorystatus_delta);
+ memorystatus_policy_more_free_offset_pages = (unsigned int) ((policy_more_free_offset_percentage / delta_percentage) * memorystatus_delta);
+ memorystatus_sysproc_aging_aggr_pages = (unsigned int) (sysproc_aging_aggr_threshold_percentage * atop_64(max_mem) / 100);
- lck_mtx_unlock(&freezer_mutex);
- return error;
+ /* Jetsam Loop Detection */
+ if (max_mem <= (512 * 1024 * 1024)) {
+ /* 512 MB devices */
+ memorystatus_jld_eval_period_msecs = 8000; /* 8000 msecs == 8 second window */
} else {
- printf("sysctl_freeze: Invalid process\n");
+ /* 1GB and larger devices */
+ memorystatus_jld_eval_period_msecs = 6000; /* 6000 msecs == 6 second window */
}
+ memorystatus_jld_enabled = TRUE;
- lck_mtx_unlock(&freezer_mutex);
- return EINVAL;
-}
-
-SYSCTL_PROC(_kern, OID_AUTO, memorystatus_freeze, CTLTYPE_INT | CTLFLAG_WR | CTLFLAG_LOCKED | CTLFLAG_MASKED,
- 0, 0, &sysctl_memorystatus_freeze, "I", "");
-
-static int
-sysctl_memorystatus_available_pages_thaw SYSCTL_HANDLER_ARGS
-{
-#pragma unused(arg1, arg2)
+ /* No contention at this point */
+ memorystatus_update_levels_locked(FALSE);
- int error, pid = 0;
- proc_t p;
+#endif /* CONFIG_JETSAM */
- if (memorystatus_freeze_enabled == FALSE) {
- return ENOTSUP;
+#if __arm64__
+ if (!PE_parse_boot_argn("entitled_max_task_pmem", &memorystatus_entitled_max_task_footprint_mb,
+ sizeof(memorystatus_entitled_max_task_footprint_mb))) {
+ if (!PE_get_default("kern.entitled_max_task_pmem", &memorystatus_entitled_max_task_footprint_mb,
+ sizeof(memorystatus_entitled_max_task_footprint_mb))) {
+ // entitled_max_task_pmem is not supported on this system.
+ memorystatus_entitled_max_task_footprint_mb = 0;
+ }
}
-
- error = sysctl_handle_int(oidp, &pid, 0, req);
- if (error || !req->newptr) {
- return error;
+ if (memorystatus_entitled_max_task_footprint_mb > max_mem / (1UL << 20) || memorystatus_entitled_max_task_footprint_mb < 0) {
+ os_log_with_startup_serial(OS_LOG_DEFAULT, "Invalid value (%d) for entitled_max_task_pmem. Setting to 0",
+ memorystatus_entitled_max_task_footprint_mb);
}
+#endif /* __arm64__ */
- if (pid == VM_PAGES_FOR_ALL_PROCS) {
- do_fastwake_warmup_all();
- return 0;
- } else {
- p = proc_find(pid);
- if (p != NULL) {
- error = task_thaw(p->task);
+ memorystatus_jetsam_snapshot_max = maxproc;
- if (error) {
- error = EIO;
- } else {
- /*
- * task_thaw() succeeded.
- *
- * We increment memorystatus_frozen_count on the sysctl freeze path.
- * And so we need the P_MEMSTAT_FROZEN to decrement the frozen count
- * when this process exits.
- *
- * proc_list_lock();
- * p->p_memstat_state &= ~P_MEMSTAT_FROZEN;
- * proc_list_unlock();
- */
- }
- proc_rele(p);
- return error;
- }
- }
+ memorystatus_jetsam_snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) +
+ (sizeof(memorystatus_jetsam_snapshot_entry_t) * memorystatus_jetsam_snapshot_max);
- return EINVAL;
-}
+ memorystatus_jetsam_snapshot = kalloc_flags(memorystatus_jetsam_snapshot_size, Z_WAITOK | Z_ZERO);
+ if (!memorystatus_jetsam_snapshot) {
+ panic("Could not allocate memorystatus_jetsam_snapshot");
+ }
-SYSCTL_PROC(_kern, OID_AUTO, memorystatus_thaw, CTLTYPE_INT | CTLFLAG_WR | CTLFLAG_LOCKED | CTLFLAG_MASKED,
- 0, 0, &sysctl_memorystatus_available_pages_thaw, "I", "");
+ memorystatus_jetsam_snapshot_copy = kalloc_flags(memorystatus_jetsam_snapshot_size, Z_WAITOK | Z_ZERO);
+ if (!memorystatus_jetsam_snapshot_copy) {
+ panic("Could not allocate memorystatus_jetsam_snapshot_copy");
+ }
-typedef struct _global_freezable_status {
- boolean_t freeze_pages_threshold_crossed;
- boolean_t freeze_eligible_procs_available;
- boolean_t freeze_scheduled_in_future;
-}global_freezable_status_t;
+#if CONFIG_FREEZE
+ memorystatus_jetsam_snapshot_freezer_max = memorystatus_jetsam_snapshot_max / JETSAM_SNAPSHOT_FREEZER_MAX_FACTOR;
+ memorystatus_jetsam_snapshot_freezer_size = sizeof(memorystatus_jetsam_snapshot_t) +
+ (sizeof(memorystatus_jetsam_snapshot_entry_t) * memorystatus_jetsam_snapshot_freezer_max);
-typedef struct _proc_freezable_status {
- boolean_t freeze_has_memstat_state;
- boolean_t freeze_has_pages_min;
- int freeze_has_probability;
- boolean_t freeze_attempted;
- uint32_t p_memstat_state;
- uint32_t p_pages;
- int p_freeze_error_code;
- int p_pid;
- char p_name[MAXCOMLEN + 1];
-}proc_freezable_status_t;
+ memorystatus_jetsam_snapshot_freezer = kalloc_flags(memorystatus_jetsam_snapshot_freezer_size, Z_WAITOK | Z_ZERO);
+ if (!memorystatus_jetsam_snapshot_freezer) {
+ panic("Could not allocate memorystatus_jetsam_snapshot_freezer");
+ }
+#endif /* CONFIG_FREEZE */
-#define MAX_FREEZABLE_PROCESSES 100
+ nanoseconds_to_absolutetime((uint64_t)JETSAM_SNAPSHOT_TIMEOUT_SECS * NSEC_PER_SEC, &memorystatus_jetsam_snapshot_timeout);
-static int
-memorystatus_freezer_get_status(user_addr_t buffer, size_t buffer_size, int32_t *retval)
-{
- uint32_t proc_count = 0, i = 0;
- global_freezable_status_t *list_head;
- proc_freezable_status_t *list_entry;
- size_t list_size = 0;
- proc_t p;
- memstat_bucket_t *bucket;
- uint32_t state = 0, pages = 0, entry_count = 0;
- boolean_t try_freeze = TRUE;
- int error = 0, probability_of_use = 0;
+ memset(&memorystatus_at_boot_snapshot, 0, sizeof(memorystatus_jetsam_snapshot_t));
+#if CONFIG_FREEZE
+ memorystatus_freeze_threshold = (unsigned int) ((freeze_threshold_percentage / delta_percentage) * memorystatus_delta);
+#endif
- if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE == FALSE) {
- return ENOTSUP;
+ /* Check the boot-arg to see if fast jetsam is allowed */
+ if (!PE_parse_boot_argn("fast_jetsam_enabled", &fast_jetsam_enabled, sizeof(fast_jetsam_enabled))) {
+ fast_jetsam_enabled = 0;
}
- list_size = sizeof(global_freezable_status_t) + (sizeof(proc_freezable_status_t) * MAX_FREEZABLE_PROCESSES);
-
- if (buffer_size < list_size) {
- return EINVAL;
+ /* Check the boot-arg to configure the maximum number of jetsam threads */
+ if (!PE_parse_boot_argn("max_jetsam_threads", &max_jetsam_threads, sizeof(max_jetsam_threads))) {
+ max_jetsam_threads = JETSAM_THREADS_LIMIT;
}
- list_head = (global_freezable_status_t*)kalloc(list_size);
- if (list_head == NULL) {
- return ENOMEM;
+ /* Restrict the maximum number of jetsam threads to JETSAM_THREADS_LIMIT */
+ if (max_jetsam_threads > JETSAM_THREADS_LIMIT) {
+ max_jetsam_threads = JETSAM_THREADS_LIMIT;
}
- memset(list_head, 0, list_size);
+ /* For low CPU systems disable fast jetsam mechanism */
+ if (vm_pageout_state.vm_restricted_to_single_processor == TRUE) {
+ max_jetsam_threads = 1;
+ fast_jetsam_enabled = 0;
+ }
- list_size = sizeof(global_freezable_status_t);
+ /* Initialize the jetsam_threads state array */
+ jetsam_threads = zalloc_permanent(sizeof(struct jetsam_thread_state) *
+ max_jetsam_threads, ZALIGN(struct jetsam_thread_state));
- proc_list_lock();
+ /* Initialize all the jetsam threads */
+ for (i = 0; i < max_jetsam_threads; i++) {
+ jetsam_threads[i].inited = FALSE;
+ jetsam_threads[i].index = i;
+ result = kernel_thread_start_priority(memorystatus_thread, NULL, 95 /* MAXPRI_KERNEL */, &jetsam_threads[i].thread);
+ if (result != KERN_SUCCESS) {
+ panic("Could not create memorystatus_thread %d", i);
+ }
+ thread_deallocate(jetsam_threads[i].thread);
+ }
+}
- uint64_t curr_time = mach_absolute_time();
+/* Centralised for the purposes of allowing panic-on-jetsam */
+extern void
+vm_run_compactor(void);
- list_head->freeze_pages_threshold_crossed = (memorystatus_available_pages < memorystatus_freeze_threshold);
- list_head->freeze_eligible_procs_available = ((memorystatus_suspended_count - memorystatus_frozen_count) > memorystatus_freeze_suspended_threshold);
- list_head->freeze_scheduled_in_future = (curr_time < memorystatus_freezer_thread_next_run_ts);
+/*
+ * The jetsam no frills kill call
+ * Return: 0 on success
+ * error code on failure (EINVAL...)
+ */
+static int
+jetsam_do_kill(proc_t p, int jetsam_flags, os_reason_t jetsam_reason)
+{
+ int error = 0;
+ error = exit_with_reason(p, W_EXITCODE(0, SIGKILL), (int *)NULL, FALSE, FALSE, jetsam_flags, jetsam_reason);
+ return error;
+}
- list_entry = (proc_freezable_status_t*) ((uintptr_t)list_head + sizeof(global_freezable_status_t));
+/*
+ * Wrapper for processes exiting with memorystatus details
+ */
+static boolean_t
+memorystatus_do_kill(proc_t p, uint32_t cause, os_reason_t jetsam_reason, uint64_t *footprint_of_killed_proc)
+{
+ int error = 0;
+ __unused pid_t victim_pid = p->p_pid;
+ uint64_t footprint = get_task_phys_footprint(p->task);
+#if (KDEBUG_LEVEL >= KDEBUG_LEVEL_STANDARD)
+ int32_t memstat_effectivepriority = p->p_memstat_effectivepriority;
+#endif /* (KDEBUG_LEVEL >= KDEBUG_LEVEL_STANDARD) */
- bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE];
+ KERNEL_DEBUG_CONSTANT((BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DO_KILL)) | DBG_FUNC_START,
+ victim_pid, cause, vm_page_free_count, footprint, 0);
+ DTRACE_MEMORYSTATUS4(memorystatus_do_kill, proc_t, p, os_reason_t, jetsam_reason, uint32_t, cause, uint64_t, footprint);
+#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
+ if (memorystatus_jetsam_panic_debug & (1 << cause)) {
+ panic("memorystatus_do_kill(): jetsam debug panic (cause: %d)", cause);
+ }
+#else
+#pragma unused(cause)
+#endif
- entry_count = (memorystatus_global_probabilities_size / sizeof(memorystatus_internal_probabilities_t));
+ if (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND) {
+ printf("memorystatus: killing process %d [%s] in high band %s (%d) - memorystatus_available_pages: %llu\n", p->p_pid,
+ (*p->p_name ? p->p_name : "unknown"),
+ memorystatus_priority_band_name(p->p_memstat_effectivepriority), p->p_memstat_effectivepriority,
+ (uint64_t)MEMORYSTATUS_LOG_AVAILABLE_PAGES);
+ }
- p = memorystatus_get_first_proc_locked(&i, FALSE);
- proc_count++;
-
- while ((proc_count <= MAX_FREEZABLE_PROCESSES) &&
- (p) &&
- (list_size < buffer_size)) {
- if (isApp(p) == FALSE) {
- p = memorystatus_get_next_proc_locked(&i, p, FALSE);
- proc_count++;
- continue;
- }
+ /*
+ * The jetsam_reason (os_reason_t) has enough information about the kill cause.
+ * We don't really need jetsam_flags anymore, so it's okay that not all possible kill causes have been mapped.
+ */
+ int jetsam_flags = P_LTERM_JETSAM;
+ switch (cause) {
+ case kMemorystatusKilledHiwat: jetsam_flags |= P_JETSAM_HIWAT; break;
+ case kMemorystatusKilledVnodes: jetsam_flags |= P_JETSAM_VNODE; break;
+ case kMemorystatusKilledVMPageShortage: jetsam_flags |= P_JETSAM_VMPAGESHORTAGE; break;
+ case kMemorystatusKilledVMCompressorThrashing:
+ case kMemorystatusKilledVMCompressorSpaceShortage: jetsam_flags |= P_JETSAM_VMTHRASHING; break;
+ case kMemorystatusKilledFCThrashing: jetsam_flags |= P_JETSAM_FCTHRASHING; break;
+ case kMemorystatusKilledPerProcessLimit: jetsam_flags |= P_JETSAM_PID; break;
+ case kMemorystatusKilledIdleExit: jetsam_flags |= P_JETSAM_IDLEEXIT; break;
+ }
+ error = jetsam_do_kill(p, jetsam_flags, jetsam_reason);
+ *footprint_of_killed_proc = ((error == 0) ? footprint : 0);
- strlcpy(list_entry->p_name, p->p_name, MAXCOMLEN + 1);
+ KERNEL_DEBUG_CONSTANT((BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DO_KILL)) | DBG_FUNC_END,
+ victim_pid, memstat_effectivepriority, vm_page_free_count, error, 0);
- list_entry->p_pid = p->p_pid;
+ KERNEL_DEBUG_CONSTANT((BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_COMPACTOR_RUN)) | DBG_FUNC_START,
+ victim_pid, cause, vm_page_free_count, *footprint_of_killed_proc, 0);
- state = p->p_memstat_state;
+ vm_run_compactor();
- if ((state & (P_MEMSTAT_TERMINATED | P_MEMSTAT_LOCKED | P_MEMSTAT_FREEZE_DISABLED | P_MEMSTAT_FREEZE_IGNORE)) ||
- !(state & P_MEMSTAT_SUSPENDED)) {
- try_freeze = list_entry->freeze_has_memstat_state = FALSE;
- } else {
- try_freeze = list_entry->freeze_has_memstat_state = TRUE;
- }
+ KERNEL_DEBUG_CONSTANT((BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_COMPACTOR_RUN)) | DBG_FUNC_END,
+ victim_pid, cause, vm_page_free_count, 0, 0);
- list_entry->p_memstat_state = state;
+ return error == 0;
+}
- memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL);
- if (pages < memorystatus_freeze_pages_min) {
- try_freeze = list_entry->freeze_has_pages_min = FALSE;
- } else {
- list_entry->freeze_has_pages_min = TRUE;
- if (try_freeze != FALSE) {
- try_freeze = TRUE;
- }
- }
+/*
+ * Node manipulation
+ */
- list_entry->p_pages = pages;
+static void
+memorystatus_check_levels_locked(void)
+{
+#if CONFIG_JETSAM
+ /* Update levels */
+ memorystatus_update_levels_locked(TRUE);
+#else /* CONFIG_JETSAM */
+ /*
+ * Nothing to do here currently since we update
+ * memorystatus_available_pages in vm_pressure_response.
+ */
+#endif /* CONFIG_JETSAM */
+}
- if (entry_count) {
- uint32_t j = 0;
- for (j = 0; j < entry_count; j++) {
- if (strncmp(memorystatus_global_probabilities_table[j].proc_name,
- p->p_name,
- MAXCOMLEN + 1) == 0) {
- probability_of_use = memorystatus_global_probabilities_table[j].use_probability;
- break;
- }
- }
+/*
+ * Pin a process to a particular jetsam band when it is in the background i.e. not doing active work.
+ * For an application: that means no longer in the FG band
+ * For a daemon: that means no longer in its 'requested' jetsam priority band
+ */
- list_entry->freeze_has_probability = probability_of_use;
+int
+memorystatus_update_inactive_jetsam_priority_band(pid_t pid, uint32_t op_flags, int jetsam_prio, boolean_t effective_now)
+{
+ int error = 0;
+ boolean_t enable = FALSE;
+ proc_t p = NULL;
- if (probability_of_use && try_freeze != FALSE) {
- try_freeze = TRUE;
- } else {
- try_freeze = FALSE;
- }
+ if (op_flags == MEMORYSTATUS_CMD_ELEVATED_INACTIVEJETSAMPRIORITY_ENABLE) {
+ enable = TRUE;
+ } else if (op_flags == MEMORYSTATUS_CMD_ELEVATED_INACTIVEJETSAMPRIORITY_DISABLE) {
+ enable = FALSE;
+ } else {
+ return EINVAL;
+ }
+
+ p = proc_find(pid);
+ if (p != NULL) {
+ if ((enable && ((p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) == P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND)) ||
+ (!enable && ((p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) == 0))) {
+ /*
+ * No change in state.
+ */
} else {
- if (try_freeze != FALSE) {
- try_freeze = TRUE;
- }
- list_entry->freeze_has_probability = -1;
- }
+ proc_list_lock();
- if (try_freeze) {
- uint32_t purgeable, wired, clean, dirty, shared;
- uint32_t max_pages = 0;
- int freezer_error_code = 0;
+ if (enable) {
+ p->p_memstat_state |= P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND;
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
- error = task_freeze(p->task, &purgeable, &wired, &clean, &dirty, max_pages, &shared, &freezer_error_code, TRUE /* eval only */);
+ if (effective_now) {
+ if (p->p_memstat_effectivepriority < jetsam_prio) {
+ if (memorystatus_highwater_enabled) {
+ /*
+ * Process is about to transition from
+ * inactive --> active
+ * assign active state
+ */
+ boolean_t is_fatal;
+ boolean_t use_active = TRUE;
+ CACHE_ACTIVE_LIMITS_LOCKED(p, is_fatal);
+ task_set_phys_footprint_limit_internal(p->task, (p->p_memstat_memlimit > 0) ? p->p_memstat_memlimit : -1, NULL, use_active, is_fatal);
+ }
+ memorystatus_update_priority_locked(p, jetsam_prio, FALSE, FALSE);
+ }
+ } else {
+ if (isProcessInAgingBands(p)) {
+ memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, FALSE, TRUE);
+ }
+ }
+ } else {
+ p->p_memstat_state &= ~P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND;
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
- if (error) {
- list_entry->p_freeze_error_code = freezer_error_code;
+ if (effective_now) {
+ if (p->p_memstat_effectivepriority == jetsam_prio) {
+ memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, FALSE, TRUE);
+ }
+ } else {
+ if (isProcessInAgingBands(p)) {
+ memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, FALSE, TRUE);
+ }
+ }
}
- list_entry->freeze_attempted = TRUE;
+ proc_list_unlock();
}
-
- list_entry++;
-
- list_size += sizeof(proc_freezable_status_t);
-
- p = memorystatus_get_next_proc_locked(&i, p, FALSE);
- proc_count++;
- }
-
- proc_list_unlock();
-
- buffer_size = list_size;
-
- error = copyout(list_head, buffer, buffer_size);
- if (error == 0) {
- *retval = buffer_size;
+ proc_rele(p);
+ error = 0;
} else {
- *retval = 0;
+ error = ESRCH;
}
- list_size = sizeof(global_freezable_status_t) + (sizeof(proc_freezable_status_t) * MAX_FREEZABLE_PROCESSES);
- kfree(list_head, list_size);
-
- MEMORYSTATUS_DEBUG(1, "memorystatus_freezer_get_status: returning %d (%lu - size)\n", error, (unsigned long)*list_size);
-
return error;
}
-static int
-memorystatus_freezer_control(int32_t flags, user_addr_t buffer, size_t buffer_size, int32_t *retval)
+static void
+memorystatus_perform_idle_demotion(__unused void *spare1, __unused void *spare2)
{
- int err = ENOTSUP;
+ proc_t p;
+ uint64_t current_time = 0, idle_delay_time = 0;
+ int demote_prio_band = 0;
+ memstat_bucket_t *demotion_bucket;
- if (flags == FREEZER_CONTROL_GET_STATUS) {
- err = memorystatus_freezer_get_status(buffer, buffer_size, retval);
- }
+ MEMORYSTATUS_DEBUG(1, "memorystatus_perform_idle_demotion()\n");
- return err;
-}
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_IDLE_DEMOTE) | DBG_FUNC_START, 0, 0, 0, 0, 0);
-#endif /* CONFIG_FREEZE */
+ current_time = mach_absolute_time();
-#endif /* DEVELOPMENT || DEBUG */
+ proc_list_lock();
-extern kern_return_t kernel_thread_start_priority(thread_continue_t continuation,
- void *parameter,
- integer_t priority,
- thread_t *new_thread);
+ demote_prio_band = JETSAM_PRIORITY_IDLE + 1;
-#if DEVELOPMENT || DEBUG
+ for (; demote_prio_band < JETSAM_PRIORITY_MAX; demote_prio_band++) {
+ if (demote_prio_band != system_procs_aging_band && demote_prio_band != applications_aging_band) {
+ continue;
+ }
-static int
-sysctl_memorystatus_disconnect_page_mappings SYSCTL_HANDLER_ARGS
-{
-#pragma unused(arg1, arg2)
- int error = 0, pid = 0;
- proc_t p;
+ demotion_bucket = &memstat_bucket[demote_prio_band];
+ p = TAILQ_FIRST(&demotion_bucket->list);
- error = sysctl_handle_int(oidp, &pid, 0, req);
- if (error || !req->newptr) {
- return error;
- }
+ while (p) {
+ MEMORYSTATUS_DEBUG(1, "memorystatus_perform_idle_demotion() found %d\n", p->p_pid);
- lck_mtx_lock(&disconnect_page_mappings_mutex);
+ assert(p->p_memstat_idledeadline);
- if (pid == -1) {
- vm_pageout_disconnect_all_pages();
- } else {
- p = proc_find(pid);
+ assert(p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS);
- if (p != NULL) {
- error = task_disconnect_page_mappings(p->task);
+ if (current_time >= p->p_memstat_idledeadline) {
+ if ((isSysProc(p) &&
+ ((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED | P_DIRTY_IS_DIRTY)) != P_DIRTY_IDLE_EXIT_ENABLED)) || /* system proc marked dirty*/
+ task_has_assertions((struct task *)(p->task))) { /* has outstanding assertions which might indicate outstanding work too */
+ idle_delay_time = (isSysProc(p)) ? memorystatus_sysprocs_idle_time(p) : memorystatus_apps_idle_time(p);
- proc_rele(p);
+ p->p_memstat_idledeadline += idle_delay_time;
+ p = TAILQ_NEXT(p, p_memstat_list);
+ } else {
+ proc_t next_proc = NULL;
- if (error) {
- error = EIO;
+ next_proc = TAILQ_NEXT(p, p_memstat_list);
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+
+ memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, false, true);
+
+ p = next_proc;
+ continue;
+ }
+ } else {
+ // No further candidates
+ break;
}
- } else {
- error = EINVAL;
}
}
- lck_mtx_unlock(&disconnect_page_mappings_mutex);
-
- return error;
-}
-SYSCTL_PROC(_kern, OID_AUTO, memorystatus_disconnect_page_mappings, CTLTYPE_INT | CTLFLAG_WR | CTLFLAG_LOCKED | CTLFLAG_MASKED,
- 0, 0, &sysctl_memorystatus_disconnect_page_mappings, "I", "");
+ memorystatus_reschedule_idle_demotion_locked();
-#endif /* DEVELOPMENT || DEBUG */
+ proc_list_unlock();
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_IDLE_DEMOTE) | DBG_FUNC_END, 0, 0, 0, 0, 0);
+}
-/*
- * Picks the sorting routine for a given jetsam priority band.
- *
- * Input:
- * bucket_index - jetsam priority band to be sorted.
- * sort_order - JETSAM_SORT_xxx from kern_memorystatus.h
- * Currently sort_order is only meaningful when handling
- * coalitions.
- *
- * Return:
- * 0 on success
- * non-0 on failure
- */
-static int
-memorystatus_sort_bucket(unsigned int bucket_index, int sort_order)
+static void
+memorystatus_schedule_idle_demotion_locked(proc_t p, boolean_t set_state)
{
- int coal_sort_order;
+ boolean_t present_in_sysprocs_aging_bucket = FALSE;
+ boolean_t present_in_apps_aging_bucket = FALSE;
+ uint64_t idle_delay_time = 0;
- /*
- * Verify the jetsam priority
- */
- if (bucket_index >= MEMSTAT_BUCKET_COUNT) {
- return EINVAL;
+ if (jetsam_aging_policy == kJetsamAgingPolicyNone) {
+ return;
}
-#if DEVELOPMENT || DEBUG
- if (sort_order == JETSAM_SORT_DEFAULT) {
- coal_sort_order = COALITION_SORT_DEFAULT;
- } else {
- coal_sort_order = sort_order; /* only used for testing scenarios */
- }
-#else
- /* Verify default */
- if (sort_order == JETSAM_SORT_DEFAULT) {
- coal_sort_order = COALITION_SORT_DEFAULT;
- } else {
- return EINVAL;
+ if ((p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) ||
+ (p->p_memstat_state & P_MEMSTAT_PRIORITY_ASSERTION)) {
+ /*
+ * This process isn't going to be making the trip to the lower bands.
+ */
+ return;
}
-#endif
-
- proc_list_lock();
- if (memstat_bucket[bucket_index].count == 0) {
- proc_list_unlock();
- return 0;
- }
+ if (isProcessInAgingBands(p)) {
+ if (jetsam_aging_policy != kJetsamAgingPolicyLegacy) {
+ assert((p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) != P_DIRTY_AGING_IN_PROGRESS);
+ }
- switch (bucket_index) {
- case JETSAM_PRIORITY_FOREGROUND:
- if (memorystatus_sort_by_largest_coalition_locked(bucket_index, coal_sort_order) == 0) {
- /*
- * Fall back to per process sorting when zero coalitions are found.
- */
- memorystatus_sort_by_largest_process_locked(bucket_index);
+ if (isSysProc(p) && system_procs_aging_band) {
+ present_in_sysprocs_aging_bucket = TRUE;
+ } else if (isApp(p) && applications_aging_band) {
+ present_in_apps_aging_bucket = TRUE;
}
- break;
- default:
- memorystatus_sort_by_largest_process_locked(bucket_index);
- break;
}
- proc_list_unlock();
-
- return 0;
-}
-/*
- * Sort processes by size for a single jetsam bucket.
- */
+ assert(!present_in_sysprocs_aging_bucket);
+ assert(!present_in_apps_aging_bucket);
-static void
-memorystatus_sort_by_largest_process_locked(unsigned int bucket_index)
-{
- proc_t p = NULL, insert_after_proc = NULL, max_proc = NULL;
- proc_t next_p = NULL, prev_max_proc = NULL;
- uint32_t pages = 0, max_pages = 0;
- memstat_bucket_t *current_bucket;
+ MEMORYSTATUS_DEBUG(1, "memorystatus_schedule_idle_demotion_locked: scheduling demotion to idle band for pid %d (dirty:0x%x, set_state %d, demotions %d).\n",
+ p->p_pid, p->p_memstat_dirty, set_state, (memorystatus_scheduled_idle_demotions_sysprocs + memorystatus_scheduled_idle_demotions_apps));
- if (bucket_index >= MEMSTAT_BUCKET_COUNT) {
- return;
+ if (isSysProc(p)) {
+ assert((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED);
}
- current_bucket = &memstat_bucket[bucket_index];
-
- p = TAILQ_FIRST(¤t_bucket->list);
-
- while (p) {
- memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL);
- max_pages = pages;
- max_proc = p;
- prev_max_proc = p;
-
- while ((next_p = TAILQ_NEXT(p, p_memstat_list)) != NULL) {
- /* traversing list until we find next largest process */
- p = next_p;
- memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL);
- if (pages > max_pages) {
- max_pages = pages;
- max_proc = p;
- }
- }
-
- if (prev_max_proc != max_proc) {
- /* found a larger process, place it in the list */
- TAILQ_REMOVE(¤t_bucket->list, max_proc, p_memstat_list);
- if (insert_after_proc == NULL) {
- TAILQ_INSERT_HEAD(¤t_bucket->list, max_proc, p_memstat_list);
- } else {
- TAILQ_INSERT_AFTER(¤t_bucket->list, insert_after_proc, max_proc, p_memstat_list);
- }
- prev_max_proc = max_proc;
- }
+ idle_delay_time = (isSysProc(p)) ? memorystatus_sysprocs_idle_time(p) : memorystatus_apps_idle_time(p);
+ if (set_state) {
+ p->p_memstat_dirty |= P_DIRTY_AGING_IN_PROGRESS;
+ p->p_memstat_idledeadline = mach_absolute_time() + idle_delay_time;
+ }
- insert_after_proc = max_proc;
+ assert(p->p_memstat_idledeadline);
- p = TAILQ_NEXT(max_proc, p_memstat_list);
+ if (isSysProc(p) && present_in_sysprocs_aging_bucket == FALSE) {
+ memorystatus_scheduled_idle_demotions_sysprocs++;
+ } else if (isApp(p) && present_in_apps_aging_bucket == FALSE) {
+ memorystatus_scheduled_idle_demotions_apps++;
}
}
-static proc_t
-memorystatus_get_first_proc_locked(unsigned int *bucket_index, boolean_t search)
+void
+memorystatus_invalidate_idle_demotion_locked(proc_t p, boolean_t clear_state)
{
- memstat_bucket_t *current_bucket;
- proc_t next_p;
+ boolean_t present_in_sysprocs_aging_bucket = FALSE;
+ boolean_t present_in_apps_aging_bucket = FALSE;
- if ((*bucket_index) >= MEMSTAT_BUCKET_COUNT) {
- return NULL;
+ if (!system_procs_aging_band && !applications_aging_band) {
+ return;
}
- current_bucket = &memstat_bucket[*bucket_index];
- next_p = TAILQ_FIRST(¤t_bucket->list);
- if (!next_p && search) {
- while (!next_p && (++(*bucket_index) < MEMSTAT_BUCKET_COUNT)) {
- current_bucket = &memstat_bucket[*bucket_index];
- next_p = TAILQ_FIRST(¤t_bucket->list);
+ if ((p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) == 0) {
+ return;
+ }
+
+ if (isProcessInAgingBands(p)) {
+ if (jetsam_aging_policy != kJetsamAgingPolicyLegacy) {
+ assert((p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) == P_DIRTY_AGING_IN_PROGRESS);
+ }
+
+ if (isSysProc(p) && system_procs_aging_band) {
+ assert(p->p_memstat_effectivepriority == system_procs_aging_band);
+ assert(p->p_memstat_idledeadline);
+ present_in_sysprocs_aging_bucket = TRUE;
+ } else if (isApp(p) && applications_aging_band) {
+ assert(p->p_memstat_effectivepriority == applications_aging_band);
+ assert(p->p_memstat_idledeadline);
+ present_in_apps_aging_bucket = TRUE;
}
}
- return next_p;
-}
+ MEMORYSTATUS_DEBUG(1, "memorystatus_invalidate_idle_demotion(): invalidating demotion to idle band for pid %d (clear_state %d, demotions %d).\n",
+ p->p_pid, clear_state, (memorystatus_scheduled_idle_demotions_sysprocs + memorystatus_scheduled_idle_demotions_apps));
-static proc_t
-memorystatus_get_next_proc_locked(unsigned int *bucket_index, proc_t p, boolean_t search)
-{
- memstat_bucket_t *current_bucket;
- proc_t next_p;
- if (!p || ((*bucket_index) >= MEMSTAT_BUCKET_COUNT)) {
- return NULL;
+ if (clear_state) {
+ p->p_memstat_idledeadline = 0;
+ p->p_memstat_dirty &= ~P_DIRTY_AGING_IN_PROGRESS;
}
- next_p = TAILQ_NEXT(p, p_memstat_list);
- while (!next_p && search && (++(*bucket_index) < MEMSTAT_BUCKET_COUNT)) {
- current_bucket = &memstat_bucket[*bucket_index];
- next_p = TAILQ_FIRST(¤t_bucket->list);
+ if (isSysProc(p) && present_in_sysprocs_aging_bucket == TRUE) {
+ memorystatus_scheduled_idle_demotions_sysprocs--;
+ assert(memorystatus_scheduled_idle_demotions_sysprocs >= 0);
+ } else if (isApp(p) && present_in_apps_aging_bucket == TRUE) {
+ memorystatus_scheduled_idle_demotions_apps--;
+ assert(memorystatus_scheduled_idle_demotions_apps >= 0);
}
- return next_p;
+ assert((memorystatus_scheduled_idle_demotions_sysprocs + memorystatus_scheduled_idle_demotions_apps) >= 0);
}
-/*
- * Structure to hold state for a jetsam thread.
- * Typically there should be a single jetsam thread
- * unless parallel jetsam is enabled.
- */
-struct jetsam_thread_state {
- boolean_t inited; /* if the thread is initialized */
- int memorystatus_wakeup; /* wake channel */
- int index; /* jetsam thread index */
- thread_t thread; /* jetsam thread pointer */
-} *jetsam_threads;
+static void
+memorystatus_reschedule_idle_demotion_locked(void)
+{
+ if (0 == (memorystatus_scheduled_idle_demotions_sysprocs + memorystatus_scheduled_idle_demotions_apps)) {
+ if (memstat_idle_demotion_deadline) {
+ /* Transitioned 1->0, so cancel next call */
+ thread_call_cancel(memorystatus_idle_demotion_call);
+ memstat_idle_demotion_deadline = 0;
+ }
+ } else {
+ memstat_bucket_t *demotion_bucket;
+ proc_t p = NULL, p1 = NULL, p2 = NULL;
-/* Maximum number of jetsam threads allowed */
-#define JETSAM_THREADS_LIMIT 3
+ if (system_procs_aging_band) {
+ demotion_bucket = &memstat_bucket[system_procs_aging_band];
+ p1 = TAILQ_FIRST(&demotion_bucket->list);
-/* Number of active jetsam threads */
-_Atomic int active_jetsam_threads = 1;
+ p = p1;
+ }
-/* Number of maximum jetsam threads configured */
-int max_jetsam_threads = JETSAM_THREADS_LIMIT;
+ if (applications_aging_band) {
+ demotion_bucket = &memstat_bucket[applications_aging_band];
+ p2 = TAILQ_FIRST(&demotion_bucket->list);
-/*
- * Global switch for enabling fast jetsam. Fast jetsam is
- * hooked up via the system_override() system call. It has the
- * following effects:
- * - Raise the jetsam threshold ("clear-the-deck")
- * - Enabled parallel jetsam on eligible devices
- */
-int fast_jetsam_enabled = 0;
+ if (p1 && p2) {
+ p = (p1->p_memstat_idledeadline > p2->p_memstat_idledeadline) ? p2 : p1;
+ } else {
+ p = (p1 == NULL) ? p2 : p1;
+ }
+ }
-/* Routine to find the jetsam state structure for the current jetsam thread */
-static inline struct jetsam_thread_state *
-jetsam_current_thread(void)
-{
- for (int thr_id = 0; thr_id < max_jetsam_threads; thr_id++) {
- if (jetsam_threads[thr_id].thread == current_thread()) {
- return &(jetsam_threads[thr_id]);
+ assert(p);
+
+ if (p != NULL) {
+ assert(p && p->p_memstat_idledeadline);
+ if (memstat_idle_demotion_deadline != p->p_memstat_idledeadline) {
+ thread_call_enter_delayed(memorystatus_idle_demotion_call, p->p_memstat_idledeadline);
+ memstat_idle_demotion_deadline = p->p_memstat_idledeadline;
+ }
}
}
- panic("jetsam_current_thread() is being called from a non-jetsam thread\n");
- /* Contol should not reach here */
- return NULL;
}
+/*
+ * List manipulation
+ */
-__private_extern__ void
-memorystatus_init(void)
+int
+memorystatus_add(proc_t p, boolean_t locked)
{
- kern_return_t result;
- int i;
+ memstat_bucket_t *bucket;
-#if CONFIG_FREEZE
- memorystatus_freeze_jetsam_band = JETSAM_PRIORITY_UI_SUPPORT;
- memorystatus_frozen_processes_max = FREEZE_PROCESSES_MAX;
- memorystatus_frozen_shared_mb_max = ((MAX_FROZEN_SHARED_MB_PERCENT * max_task_footprint_mb) / 100); /* 10% of the system wide task limit */
- memorystatus_freeze_shared_mb_per_process_max = (memorystatus_frozen_shared_mb_max / 4);
- memorystatus_freeze_pages_min = FREEZE_PAGES_MIN;
- memorystatus_freeze_pages_max = FREEZE_PAGES_MAX;
- memorystatus_max_frozen_demotions_daily = MAX_FROZEN_PROCESS_DEMOTIONS;
- memorystatus_thaw_count_demotion_threshold = MIN_THAW_DEMOTION_THRESHOLD;
-#endif
+ MEMORYSTATUS_DEBUG(1, "memorystatus_list_add(): adding pid %d with priority %d.\n", p->p_pid, p->p_memstat_effectivepriority);
-#if DEVELOPMENT || DEBUG
- disconnect_page_mappings_lck_grp_attr = lck_grp_attr_alloc_init();
- disconnect_page_mappings_lck_grp = lck_grp_alloc_init("disconnect_page_mappings", disconnect_page_mappings_lck_grp_attr);
+ if (!locked) {
+ proc_list_lock();
+ }
- lck_mtx_init(&disconnect_page_mappings_mutex, disconnect_page_mappings_lck_grp, NULL);
+ DTRACE_MEMORYSTATUS2(memorystatus_add, proc_t, p, int32_t, p->p_memstat_effectivepriority);
- if (kill_on_no_paging_space == TRUE) {
- max_kill_priority = JETSAM_PRIORITY_MAX;
+ /* Processes marked internal do not have priority tracked */
+ if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
+ goto exit;
}
-#endif
-
- /* Init buckets */
- for (i = 0; i < MEMSTAT_BUCKET_COUNT; i++) {
- TAILQ_INIT(&memstat_bucket[i].list);
- memstat_bucket[i].count = 0;
+ /*
+ * Opt out system processes from being frozen by default.
+ * For coalition-based freezing, we only want to freeze sysprocs that have specifically opted in.
+ */
+ if (isSysProc(p)) {
+ p->p_memstat_state |= P_MEMSTAT_FREEZE_DISABLED;
}
- memorystatus_idle_demotion_call = thread_call_allocate((thread_call_func_t)memorystatus_perform_idle_demotion, NULL);
+#if CONFIG_FREEZE
+ memorystatus_freeze_init_proc(p);
+#endif
-#if CONFIG_JETSAM
- nanoseconds_to_absolutetime((uint64_t)DEFERRED_IDLE_EXIT_TIME_SECS * NSEC_PER_SEC, &memorystatus_sysprocs_idle_delay_time);
- nanoseconds_to_absolutetime((uint64_t)DEFERRED_IDLE_EXIT_TIME_SECS * NSEC_PER_SEC, &memorystatus_apps_idle_delay_time);
-
- /* Apply overrides */
- PE_get_default("kern.jetsam_delta", &delta_percentage, sizeof(delta_percentage));
- if (delta_percentage == 0) {
- delta_percentage = 5;
- }
- assert(delta_percentage < 100);
- PE_get_default("kern.jetsam_critical_threshold", &critical_threshold_percentage, sizeof(critical_threshold_percentage));
- assert(critical_threshold_percentage < 100);
- PE_get_default("kern.jetsam_idle_offset", &idle_offset_percentage, sizeof(idle_offset_percentage));
- assert(idle_offset_percentage < 100);
- PE_get_default("kern.jetsam_pressure_threshold", &pressure_threshold_percentage, sizeof(pressure_threshold_percentage));
- assert(pressure_threshold_percentage < 100);
- PE_get_default("kern.jetsam_freeze_threshold", &freeze_threshold_percentage, sizeof(freeze_threshold_percentage));
- assert(freeze_threshold_percentage < 100);
-
- if (!PE_parse_boot_argn("jetsam_aging_policy", &jetsam_aging_policy,
- sizeof(jetsam_aging_policy))) {
- if (!PE_get_default("kern.jetsam_aging_policy", &jetsam_aging_policy,
- sizeof(jetsam_aging_policy))) {
- jetsam_aging_policy = kJetsamAgingPolicyLegacy;
- }
- }
-
- if (jetsam_aging_policy > kJetsamAgingPolicyMax) {
- jetsam_aging_policy = kJetsamAgingPolicyLegacy;
- }
-
- switch (jetsam_aging_policy) {
- case kJetsamAgingPolicyNone:
- system_procs_aging_band = JETSAM_PRIORITY_IDLE;
- applications_aging_band = JETSAM_PRIORITY_IDLE;
- break;
+ bucket = &memstat_bucket[p->p_memstat_effectivepriority];
- case kJetsamAgingPolicyLegacy:
+ if (isSysProc(p) && system_procs_aging_band && (p->p_memstat_effectivepriority == system_procs_aging_band)) {
+ assert(bucket->count == memorystatus_scheduled_idle_demotions_sysprocs - 1);
+ } else if (isApp(p) && applications_aging_band && (p->p_memstat_effectivepriority == applications_aging_band)) {
+ assert(bucket->count == memorystatus_scheduled_idle_demotions_apps - 1);
+ } else if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE) {
/*
- * Legacy behavior where some daemons get a 10s protection once
- * AND only before the first clean->dirty->clean transition before
- * going into IDLE band.
+ * Entering the idle band.
+ * Record idle start time.
*/
- system_procs_aging_band = JETSAM_PRIORITY_AGING_BAND1;
- applications_aging_band = JETSAM_PRIORITY_IDLE;
- break;
-
- case kJetsamAgingPolicySysProcsReclaimedFirst:
- system_procs_aging_band = JETSAM_PRIORITY_AGING_BAND1;
- applications_aging_band = JETSAM_PRIORITY_AGING_BAND2;
- break;
-
- case kJetsamAgingPolicyAppsReclaimedFirst:
- system_procs_aging_band = JETSAM_PRIORITY_AGING_BAND2;
- applications_aging_band = JETSAM_PRIORITY_AGING_BAND1;
- break;
-
- default:
- break;
+ p->p_memstat_idle_start = mach_absolute_time();
}
- /*
- * The aging bands cannot overlap with the JETSAM_PRIORITY_ELEVATED_INACTIVE
- * band and must be below it in priority. This is so that we don't have to make
- * our 'aging' code worry about a mix of processes, some of which need to age
- * and some others that need to stay elevated in the jetsam bands.
- */
- assert(JETSAM_PRIORITY_ELEVATED_INACTIVE > system_procs_aging_band);
- assert(JETSAM_PRIORITY_ELEVATED_INACTIVE > applications_aging_band);
-
- /* Take snapshots for idle-exit kills by default? First check the boot-arg... */
- if (!PE_parse_boot_argn("jetsam_idle_snapshot", &memorystatus_idle_snapshot, sizeof(memorystatus_idle_snapshot))) {
- /* ...no boot-arg, so check the device tree */
- PE_get_default("kern.jetsam_idle_snapshot", &memorystatus_idle_snapshot, sizeof(memorystatus_idle_snapshot));
+ TAILQ_INSERT_TAIL(&bucket->list, p, p_memstat_list);
+ bucket->count++;
+ if (p->p_memstat_relaunch_flags & (P_MEMSTAT_RELAUNCH_HIGH)) {
+ bucket->relaunch_high_count++;
}
- memorystatus_delta = delta_percentage * atop_64(max_mem) / 100;
- memorystatus_available_pages_critical_idle_offset = idle_offset_percentage * atop_64(max_mem) / 100;
- memorystatus_available_pages_critical_base = (critical_threshold_percentage / delta_percentage) * memorystatus_delta;
- memorystatus_policy_more_free_offset_pages = (policy_more_free_offset_percentage / delta_percentage) * memorystatus_delta;
+ memorystatus_list_count++;
- /* Jetsam Loop Detection */
- if (max_mem <= (512 * 1024 * 1024)) {
- /* 512 MB devices */
- memorystatus_jld_eval_period_msecs = 8000; /* 8000 msecs == 8 second window */
- } else {
- /* 1GB and larger devices */
- memorystatus_jld_eval_period_msecs = 6000; /* 6000 msecs == 6 second window */
+ memorystatus_check_levels_locked();
+
+exit:
+ if (!locked) {
+ proc_list_unlock();
}
- memorystatus_jld_enabled = TRUE;
+ return 0;
+}
- /* No contention at this point */
- memorystatus_update_levels_locked(FALSE);
+/*
+ * Description:
+ * Moves a process from one jetsam bucket to another.
+ * which changes the LRU position of the process.
+ *
+ * Monitors transition between buckets and if necessary
+ * will update cached memory limits accordingly.
+ *
+ * skip_demotion_check:
+ * - if the 'jetsam aging policy' is NOT 'legacy':
+ * When this flag is TRUE, it means we are going
+ * to age the ripe processes out of the aging bands and into the
+ * IDLE band and apply their inactive memory limits.
+ *
+ * - if the 'jetsam aging policy' is 'legacy':
+ * When this flag is TRUE, it might mean the above aging mechanism
+ * OR
+ * It might be that we have a process that has used up its 'idle deferral'
+ * stay that is given to it once per lifetime. And in this case, the process
+ * won't be going through any aging codepaths. But we still need to apply
+ * the right inactive limits and so we explicitly set this to TRUE if the
+ * new priority for the process is the IDLE band.
+ */
+void
+memorystatus_update_priority_locked(proc_t p, int priority, boolean_t head_insert, boolean_t skip_demotion_check)
+{
+ memstat_bucket_t *old_bucket, *new_bucket;
-#endif /* CONFIG_JETSAM */
+ assert(priority < MEMSTAT_BUCKET_COUNT);
- memorystatus_jetsam_snapshot_max = maxproc;
+ /* Ensure that exit isn't underway, leaving the proc retained but removed from its bucket */
+ if ((p->p_listflag & P_LIST_EXITED) != 0) {
+ return;
+ }
- memorystatus_jetsam_snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) +
- (sizeof(memorystatus_jetsam_snapshot_entry_t) * memorystatus_jetsam_snapshot_max);
+ MEMORYSTATUS_DEBUG(1, "memorystatus_update_priority_locked(): setting %s(%d) to priority %d, inserting at %s\n",
+ (*p->p_name ? p->p_name : "unknown"), p->p_pid, priority, head_insert ? "head" : "tail");
- memorystatus_jetsam_snapshot =
- (memorystatus_jetsam_snapshot_t*)kalloc(memorystatus_jetsam_snapshot_size);
- if (!memorystatus_jetsam_snapshot) {
- panic("Could not allocate memorystatus_jetsam_snapshot");
- }
+ DTRACE_MEMORYSTATUS3(memorystatus_update_priority, proc_t, p, int32_t, p->p_memstat_effectivepriority, int, priority);
- memorystatus_jetsam_snapshot_copy =
- (memorystatus_jetsam_snapshot_t*)kalloc(memorystatus_jetsam_snapshot_size);
- if (!memorystatus_jetsam_snapshot_copy) {
- panic("Could not allocate memorystatus_jetsam_snapshot_copy");
- }
+ old_bucket = &memstat_bucket[p->p_memstat_effectivepriority];
- nanoseconds_to_absolutetime((uint64_t)JETSAM_SNAPSHOT_TIMEOUT_SECS * NSEC_PER_SEC, &memorystatus_jetsam_snapshot_timeout);
+ if (skip_demotion_check == FALSE) {
+ if (isSysProc(p)) {
+ /*
+ * For system processes, the memorystatus_dirty_* routines take care of adding/removing
+ * the processes from the aging bands and balancing the demotion counts.
+ * We can, however, override that if the process has an 'elevated inactive jetsam band' attribute.
+ */
- memset(&memorystatus_at_boot_snapshot, 0, sizeof(memorystatus_jetsam_snapshot_t));
+ if (p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) {
+ /*
+ * 2 types of processes can use the non-standard elevated inactive band:
+ * - Frozen processes that always land in memorystatus_freeze_jetsam_band
+ * OR
+ * - processes that specifically opt-in to the elevated inactive support e.g. docked processes.
+ */
+#if CONFIG_FREEZE
+ if (p->p_memstat_state & P_MEMSTAT_FROZEN) {
+ if (priority <= memorystatus_freeze_jetsam_band) {
+ priority = memorystatus_freeze_jetsam_band;
+ }
+ } else
+#endif /* CONFIG_FREEZE */
+ {
+ if (priority <= JETSAM_PRIORITY_ELEVATED_INACTIVE) {
+ priority = JETSAM_PRIORITY_ELEVATED_INACTIVE;
+ }
+ }
+ assert(!(p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS));
+ }
+ } else if (isApp(p)) {
+ /*
+ * Check to see if the application is being lowered in jetsam priority. If so, and:
+ * - it has an 'elevated inactive jetsam band' attribute, then put it in the appropriate band.
+ * - it is a normal application, then let it age in the aging band if that policy is in effect.
+ */
+ if (p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) {
#if CONFIG_FREEZE
- memorystatus_freeze_threshold = (freeze_threshold_percentage / delta_percentage) * memorystatus_delta;
-#endif
+ if (p->p_memstat_state & P_MEMSTAT_FROZEN) {
+ if (priority <= memorystatus_freeze_jetsam_band) {
+ priority = memorystatus_freeze_jetsam_band;
+ }
+ } else
+#endif /* CONFIG_FREEZE */
+ {
+ if (priority <= JETSAM_PRIORITY_ELEVATED_INACTIVE) {
+ priority = JETSAM_PRIORITY_ELEVATED_INACTIVE;
+ }
+ }
+ } else {
+ if (applications_aging_band) {
+ if (p->p_memstat_effectivepriority == applications_aging_band) {
+ assert(old_bucket->count == (memorystatus_scheduled_idle_demotions_apps + 1));
+ }
- /* Check the boot-arg to see if fast jetsam is allowed */
- if (!PE_parse_boot_argn("fast_jetsam_enabled", &fast_jetsam_enabled, sizeof(fast_jetsam_enabled))) {
- fast_jetsam_enabled = 0;
+ if ((jetsam_aging_policy != kJetsamAgingPolicyLegacy) && (priority <= applications_aging_band)) {
+ assert(!(p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS));
+ priority = applications_aging_band;
+ memorystatus_schedule_idle_demotion_locked(p, TRUE);
+ }
+ }
+ }
+ }
}
- /* Check the boot-arg to configure the maximum number of jetsam threads */
- if (!PE_parse_boot_argn("max_jetsam_threads", &max_jetsam_threads, sizeof(max_jetsam_threads))) {
- max_jetsam_threads = JETSAM_THREADS_LIMIT;
+ if ((system_procs_aging_band && (priority == system_procs_aging_band)) || (applications_aging_band && (priority == applications_aging_band))) {
+ assert(p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS);
}
- /* Restrict the maximum number of jetsam threads to JETSAM_THREADS_LIMIT */
- if (max_jetsam_threads > JETSAM_THREADS_LIMIT) {
- max_jetsam_threads = JETSAM_THREADS_LIMIT;
+#if DEVELOPMENT || DEBUG
+ if (priority == JETSAM_PRIORITY_IDLE && /* if the process is on its way into the IDLE band */
+ skip_demotion_check == FALSE && /* and it isn't via the path that will set the INACTIVE memlimits */
+ (p->p_memstat_dirty & P_DIRTY_TRACK) && /* and it has 'DIRTY' tracking enabled */
+ ((p->p_memstat_memlimit != p->p_memstat_memlimit_inactive) || /* and we notice that the current limit isn't the right value (inactive) */
+ ((p->p_memstat_state & P_MEMSTAT_MEMLIMIT_INACTIVE_FATAL) ? (!(p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT)) : (p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT)))) { /* OR type (fatal vs non-fatal) */
+ printf("memorystatus_update_priority_locked: on %s with 0x%x, prio: %d and %d\n", p->p_name, p->p_memstat_state, priority, p->p_memstat_memlimit); /* then we must catch this */
}
+#endif /* DEVELOPMENT || DEBUG */
- /* For low CPU systems disable fast jetsam mechanism */
- if (vm_pageout_state.vm_restricted_to_single_processor == TRUE) {
- max_jetsam_threads = 1;
- fast_jetsam_enabled = 0;
+ TAILQ_REMOVE(&old_bucket->list, p, p_memstat_list);
+ old_bucket->count--;
+ if (p->p_memstat_relaunch_flags & (P_MEMSTAT_RELAUNCH_HIGH)) {
+ old_bucket->relaunch_high_count--;
}
- /* Initialize the jetsam_threads state array */
- jetsam_threads = kalloc(sizeof(struct jetsam_thread_state) * max_jetsam_threads);
-
- /* Initialize all the jetsam threads */
- for (i = 0; i < max_jetsam_threads; i++) {
- result = kernel_thread_start_priority(memorystatus_thread, NULL, 95 /* MAXPRI_KERNEL */, &jetsam_threads[i].thread);
- if (result == KERN_SUCCESS) {
- jetsam_threads[i].inited = FALSE;
- jetsam_threads[i].index = i;
- thread_deallocate(jetsam_threads[i].thread);
- } else {
- panic("Could not create memorystatus_thread %d", i);
- }
+ new_bucket = &memstat_bucket[priority];
+ if (head_insert) {
+ TAILQ_INSERT_HEAD(&new_bucket->list, p, p_memstat_list);
+ } else {
+ TAILQ_INSERT_TAIL(&new_bucket->list, p, p_memstat_list);
+ }
+ new_bucket->count++;
+ if (p->p_memstat_relaunch_flags & (P_MEMSTAT_RELAUNCH_HIGH)) {
+ new_bucket->relaunch_high_count++;
}
-}
-/* Centralised for the purposes of allowing panic-on-jetsam */
-extern void
-vm_run_compactor(void);
+ if (memorystatus_highwater_enabled) {
+ boolean_t is_fatal;
+ boolean_t use_active;
-/*
- * The jetsam no frills kill call
- * Return: 0 on success
- * error code on failure (EINVAL...)
- */
-static int
-jetsam_do_kill(proc_t p, int jetsam_flags, os_reason_t jetsam_reason)
-{
- int error = 0;
- error = exit_with_reason(p, W_EXITCODE(0, SIGKILL), (int *)NULL, FALSE, FALSE, jetsam_flags, jetsam_reason);
- return error;
-}
+ /*
+ * If cached limit data is updated, then the limits
+ * will be enforced by writing to the ledgers.
+ */
+ boolean_t ledger_update_needed = TRUE;
-/*
- * Wrapper for processes exiting with memorystatus details
- */
-static boolean_t
-memorystatus_do_kill(proc_t p, uint32_t cause, os_reason_t jetsam_reason)
-{
- int error = 0;
- __unused pid_t victim_pid = p->p_pid;
+ /*
+ * Here, we must update the cached memory limit if the task
+ * is transitioning between:
+ * active <--> inactive
+ * FG <--> BG
+ * but:
+ * dirty <--> clean is ignored
+ *
+ * We bypass non-idle processes that have opted into dirty tracking because
+ * a move between buckets does not imply a transition between the
+ * dirty <--> clean state.
+ */
- KERNEL_DEBUG_CONSTANT((BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DO_KILL)) | DBG_FUNC_START,
- victim_pid, cause, vm_page_free_count, 0, 0);
+ if (p->p_memstat_dirty & P_DIRTY_TRACK) {
+ if (skip_demotion_check == TRUE && priority == JETSAM_PRIORITY_IDLE) {
+ CACHE_INACTIVE_LIMITS_LOCKED(p, is_fatal);
+ use_active = FALSE;
+ } else {
+ ledger_update_needed = FALSE;
+ }
+ } else if ((priority >= JETSAM_PRIORITY_FOREGROUND) && (p->p_memstat_effectivepriority < JETSAM_PRIORITY_FOREGROUND)) {
+ /*
+ * inactive --> active
+ * BG --> FG
+ * assign active state
+ */
+ CACHE_ACTIVE_LIMITS_LOCKED(p, is_fatal);
+ use_active = TRUE;
+ } else if ((priority < JETSAM_PRIORITY_FOREGROUND) && (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND)) {
+ /*
+ * active --> inactive
+ * FG --> BG
+ * assign inactive state
+ */
+ CACHE_INACTIVE_LIMITS_LOCKED(p, is_fatal);
+ use_active = FALSE;
+ } else {
+ /*
+ * The transition between jetsam priority buckets apparently did
+ * not affect active/inactive state.
+ * This is not unusual... especially during startup when
+ * processes are getting established in their respective bands.
+ */
+ ledger_update_needed = FALSE;
+ }
- DTRACE_MEMORYSTATUS3(memorystatus_do_kill, proc_t, p, os_reason_t, jetsam_reason, uint32_t, cause);
-#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
- if (memorystatus_jetsam_panic_debug & (1 << cause)) {
- panic("memorystatus_do_kill(): jetsam debug panic (cause: %d)", cause);
- }
-#else
-#pragma unused(cause)
-#endif
+ /*
+ * Enforce the new limits by writing to the ledger
+ */
+ if (ledger_update_needed) {
+ task_set_phys_footprint_limit_internal(p->task, (p->p_memstat_memlimit > 0) ? p->p_memstat_memlimit : -1, NULL, use_active, is_fatal);
- if (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND) {
- printf("memorystatus: killing process %d [%s] in high band %s (%d) - memorystatus_available_pages: %llu\n", p->p_pid,
- (*p->p_name ? p->p_name : "unknown"),
- memorystatus_priority_band_name(p->p_memstat_effectivepriority), p->p_memstat_effectivepriority,
- (uint64_t)memorystatus_available_pages);
+ MEMORYSTATUS_DEBUG(3, "memorystatus_update_priority_locked: new limit on pid %d (%dMB %s) priority old --> new (%d --> %d) dirty?=0x%x %s\n",
+ p->p_pid, (p->p_memstat_memlimit > 0 ? p->p_memstat_memlimit : -1),
+ (p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT ? "F " : "NF"), p->p_memstat_effectivepriority, priority, p->p_memstat_dirty,
+ (p->p_memstat_dirty ? ((p->p_memstat_dirty & P_DIRTY) ? "isdirty" : "isclean") : ""));
+ }
}
/*
- * The jetsam_reason (os_reason_t) has enough information about the kill cause.
- * We don't really need jetsam_flags anymore, so it's okay that not all possible kill causes have been mapped.
+ * Record idle start or idle delta.
*/
- int jetsam_flags = P_LTERM_JETSAM;
- switch (cause) {
- case kMemorystatusKilledHiwat: jetsam_flags |= P_JETSAM_HIWAT; break;
- case kMemorystatusKilledVnodes: jetsam_flags |= P_JETSAM_VNODE; break;
- case kMemorystatusKilledVMPageShortage: jetsam_flags |= P_JETSAM_VMPAGESHORTAGE; break;
- case kMemorystatusKilledVMCompressorThrashing:
- case kMemorystatusKilledVMCompressorSpaceShortage: jetsam_flags |= P_JETSAM_VMTHRASHING; break;
- case kMemorystatusKilledFCThrashing: jetsam_flags |= P_JETSAM_FCTHRASHING; break;
- case kMemorystatusKilledPerProcessLimit: jetsam_flags |= P_JETSAM_PID; break;
- case kMemorystatusKilledIdleExit: jetsam_flags |= P_JETSAM_IDLEEXIT; break;
+ if (p->p_memstat_effectivepriority == priority) {
+ /*
+ * This process is not transitioning between
+ * jetsam priority buckets. Do nothing.
+ */
+ } else if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE) {
+ uint64_t now;
+ /*
+ * Transitioning out of the idle priority bucket.
+ * Record idle delta.
+ */
+ assert(p->p_memstat_idle_start != 0);
+ now = mach_absolute_time();
+ if (now > p->p_memstat_idle_start) {
+ p->p_memstat_idle_delta = now - p->p_memstat_idle_start;
+ }
+
+ /*
+ * About to become active and so memory footprint could change.
+ * So mark it eligible for freeze-considerations next time around.
+ */
+ if (p->p_memstat_state & P_MEMSTAT_FREEZE_IGNORE) {
+ p->p_memstat_state &= ~P_MEMSTAT_FREEZE_IGNORE;
+ }
+ } else if (priority == JETSAM_PRIORITY_IDLE) {
+ /*
+ * Transitioning into the idle priority bucket.
+ * Record idle start.
+ */
+ p->p_memstat_idle_start = mach_absolute_time();
}
- error = jetsam_do_kill(p, jetsam_flags, jetsam_reason);
- KERNEL_DEBUG_CONSTANT((BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DO_KILL)) | DBG_FUNC_END,
- victim_pid, cause, vm_page_free_count, error, 0);
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_CHANGE_PRIORITY), p->p_pid, priority, p->p_memstat_effectivepriority, 0, 0);
- vm_run_compactor();
+ p->p_memstat_effectivepriority = priority;
- return error == 0;
-}
+#if CONFIG_SECLUDED_MEMORY
+ if (secluded_for_apps &&
+ task_could_use_secluded_mem(p->task)) {
+ task_set_can_use_secluded_mem(
+ p->task,
+ (priority >= JETSAM_PRIORITY_FOREGROUND));
+ }
+#endif /* CONFIG_SECLUDED_MEMORY */
-/*
- * Node manipulation
- */
+ memorystatus_check_levels_locked();
+}
-static void
-memorystatus_check_levels_locked(void)
+int
+memorystatus_relaunch_flags_update(proc_t p, int relaunch_flags)
{
-#if CONFIG_JETSAM
- /* Update levels */
- memorystatus_update_levels_locked(TRUE);
-#else /* CONFIG_JETSAM */
- /*
- * Nothing to do here currently since we update
- * memorystatus_available_pages in vm_pressure_response.
- */
-#endif /* CONFIG_JETSAM */
+ p->p_memstat_relaunch_flags = relaunch_flags;
+ KDBG(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_RELAUNCH_FLAGS), p->p_pid, relaunch_flags, 0, 0, 0);
+ return 0;
}
/*
- * Pin a process to a particular jetsam band when it is in the background i.e. not doing active work.
- * For an application: that means no longer in the FG band
- * For a daemon: that means no longer in its 'requested' jetsam priority band
+ *
+ * Description: Update the jetsam priority and memory limit attributes for a given process.
+ *
+ * Parameters:
+ * p init this process's jetsam information.
+ * priority The jetsam priority band
+ * user_data user specific data, unused by the kernel
+ * is_assertion When true, a priority update is driven by an assertion.
+ * effective guards against race if process's update already occurred
+ * update_memlimit When true we know this is the init step via the posix_spawn path.
+ *
+ * memlimit_active Value in megabytes; The monitored footprint level while the
+ * process is active. Exceeding it may result in termination
+ * based on it's associated fatal flag.
+ *
+ * memlimit_active_is_fatal When a process is active and exceeds its memory footprint,
+ * this describes whether or not it should be immediately fatal.
+ *
+ * memlimit_inactive Value in megabytes; The monitored footprint level while the
+ * process is inactive. Exceeding it may result in termination
+ * based on it's associated fatal flag.
+ *
+ * memlimit_inactive_is_fatal When a process is inactive and exceeds its memory footprint,
+ * this describes whether or not it should be immediatly fatal.
+ *
+ * Returns: 0 Success
+ * non-0 Failure
*/
int
-memorystatus_update_inactive_jetsam_priority_band(pid_t pid, uint32_t op_flags, int jetsam_prio, boolean_t effective_now)
+memorystatus_update(proc_t p, int priority, uint64_t user_data, boolean_t is_assertion, boolean_t effective, boolean_t update_memlimit,
+ int32_t memlimit_active, boolean_t memlimit_active_is_fatal,
+ int32_t memlimit_inactive, boolean_t memlimit_inactive_is_fatal)
{
- int error = 0;
- boolean_t enable = FALSE;
- proc_t p = NULL;
+ int ret;
+ boolean_t head_insert = false;
- if (op_flags == MEMORYSTATUS_CMD_ELEVATED_INACTIVEJETSAMPRIORITY_ENABLE) {
- enable = TRUE;
- } else if (op_flags == MEMORYSTATUS_CMD_ELEVATED_INACTIVEJETSAMPRIORITY_DISABLE) {
- enable = FALSE;
- } else {
- return EINVAL;
+ MEMORYSTATUS_DEBUG(1, "memorystatus_update: changing (%s) pid %d: priority %d, user_data 0x%llx\n", (*p->p_name ? p->p_name : "unknown"), p->p_pid, priority, user_data);
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_UPDATE) | DBG_FUNC_START, p->p_pid, priority, user_data, effective, 0);
+
+ if (priority == -1) {
+ /* Use as shorthand for default priority */
+ priority = JETSAM_PRIORITY_DEFAULT;
+ } else if ((priority == system_procs_aging_band) || (priority == applications_aging_band)) {
+ /* Both the aging bands are reserved for internal use; if requested, adjust to JETSAM_PRIORITY_IDLE. */
+ priority = JETSAM_PRIORITY_IDLE;
+ } else if (priority == JETSAM_PRIORITY_IDLE_HEAD) {
+ /* JETSAM_PRIORITY_IDLE_HEAD inserts at the head of the idle queue */
+ priority = JETSAM_PRIORITY_IDLE;
+ head_insert = TRUE;
+ } else if ((priority < 0) || (priority >= MEMSTAT_BUCKET_COUNT)) {
+ /* Sanity check */
+ ret = EINVAL;
+ goto out;
}
- p = proc_find(pid);
- if (p != NULL) {
- if ((enable && ((p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) == P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND)) ||
- (!enable && ((p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) == 0))) {
+ proc_list_lock();
+
+ assert(!(p->p_memstat_state & P_MEMSTAT_INTERNAL));
+
+ if (effective && (p->p_memstat_state & P_MEMSTAT_PRIORITYUPDATED)) {
+ ret = EALREADY;
+ proc_list_unlock();
+ MEMORYSTATUS_DEBUG(1, "memorystatus_update: effective change specified for pid %d, but change already occurred.\n", p->p_pid);
+ goto out;
+ }
+
+ if ((p->p_memstat_state & P_MEMSTAT_TERMINATED) || ((p->p_listflag & P_LIST_EXITED) != 0)) {
+ /*
+ * This could happen when a process calling posix_spawn() is exiting on the jetsam thread.
+ */
+ ret = EBUSY;
+ proc_list_unlock();
+ goto out;
+ }
+
+ p->p_memstat_state |= P_MEMSTAT_PRIORITYUPDATED;
+ p->p_memstat_userdata = user_data;
+
+ if (is_assertion) {
+ if (priority == JETSAM_PRIORITY_IDLE) {
/*
- * No change in state.
+ * Assertions relinquish control when the process is heading to IDLE.
*/
- } else {
- proc_list_lock();
+ if (p->p_memstat_state & P_MEMSTAT_PRIORITY_ASSERTION) {
+ /*
+ * Mark the process as no longer being managed by assertions.
+ */
+ p->p_memstat_state &= ~P_MEMSTAT_PRIORITY_ASSERTION;
+ } else {
+ /*
+ * Ignore an idle priority transition if the process is not
+ * already managed by assertions. We won't treat this as
+ * an error, but we will log the unexpected behavior and bail.
+ */
+ os_log(OS_LOG_DEFAULT, "memorystatus: Ignore assertion driven idle priority. Process not previously controlled %s:%d\n",
+ (*p->p_name ? p->p_name : "unknown"), p->p_pid);
- if (enable) {
- p->p_memstat_state |= P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND;
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ ret = 0;
+ proc_list_unlock();
+ goto out;
+ }
+ } else {
+ /*
+ * Process is now being managed by assertions,
+ */
+ p->p_memstat_state |= P_MEMSTAT_PRIORITY_ASSERTION;
+ }
- if (effective_now) {
- if (p->p_memstat_effectivepriority < jetsam_prio) {
- if (memorystatus_highwater_enabled) {
- /*
- * Process is about to transition from
- * inactive --> active
- * assign active state
- */
- boolean_t is_fatal;
- boolean_t use_active = TRUE;
- CACHE_ACTIVE_LIMITS_LOCKED(p, is_fatal);
- task_set_phys_footprint_limit_internal(p->task, (p->p_memstat_memlimit > 0) ? p->p_memstat_memlimit : -1, NULL, use_active, is_fatal);
- }
- memorystatus_update_priority_locked(p, jetsam_prio, FALSE, FALSE);
- }
- } else {
- if (isProcessInAgingBands(p)) {
- memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, FALSE, TRUE);
- }
- }
+ /* Always update the assertion priority in this path */
+
+ p->p_memstat_assertionpriority = priority;
+
+ int memstat_dirty_flags = memorystatus_dirty_get(p, TRUE); /* proc_list_lock is held */
+
+ if (memstat_dirty_flags != 0) {
+ /*
+ * Calculate maximum priority only when dirty tracking processes are involved.
+ */
+ int maxpriority;
+ if (memstat_dirty_flags & PROC_DIRTY_IS_DIRTY) {
+ maxpriority = MAX(p->p_memstat_assertionpriority, p->p_memstat_requestedpriority);
} else {
- p->p_memstat_state &= ~P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND;
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ /* clean */
- if (effective_now) {
- if (p->p_memstat_effectivepriority == jetsam_prio) {
- memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, FALSE, TRUE);
+ if (memstat_dirty_flags & PROC_DIRTY_ALLOWS_IDLE_EXIT) {
+ /*
+ * The aging policy must be evaluated and applied here because runnningboardd
+ * has relinquished its hold on the jetsam priority by attempting to move a
+ * clean process to the idle band.
+ */
+
+ int newpriority = JETSAM_PRIORITY_IDLE;
+ if ((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED | P_DIRTY_IS_DIRTY)) == P_DIRTY_IDLE_EXIT_ENABLED) {
+ newpriority = (p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) ? system_procs_aging_band : JETSAM_PRIORITY_IDLE;
}
- } else {
- if (isProcessInAgingBands(p)) {
- memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, FALSE, TRUE);
+
+ maxpriority = MAX(p->p_memstat_assertionpriority, newpriority );
+
+ if (newpriority == system_procs_aging_band) {
+ memorystatus_schedule_idle_demotion_locked(p, FALSE);
}
+ } else {
+ /*
+ * Preserves requestedpriority when the process does not support pressured exit.
+ */
+ maxpriority = MAX(p->p_memstat_assertionpriority, p->p_memstat_requestedpriority);
}
}
-
- proc_list_unlock();
+ priority = maxpriority;
}
- proc_rele(p);
- error = 0;
} else {
- error = ESRCH;
+ p->p_memstat_requestedpriority = priority;
}
- return error;
-}
+ if (update_memlimit) {
+ boolean_t is_fatal;
+ boolean_t use_active;
-static void
-memorystatus_perform_idle_demotion(__unused void *spare1, __unused void *spare2)
-{
- proc_t p;
- uint64_t current_time = 0, idle_delay_time = 0;
- int demote_prio_band = 0;
- memstat_bucket_t *demotion_bucket;
+ /*
+ * Posix_spawn'd processes come through this path to instantiate ledger limits.
+ * Forked processes do not come through this path, so no ledger limits exist.
+ * (That's why forked processes can consume unlimited memory.)
+ */
- MEMORYSTATUS_DEBUG(1, "memorystatus_perform_idle_demotion()\n");
+ MEMORYSTATUS_DEBUG(3, "memorystatus_update(enter): pid %d, priority %d, dirty=0x%x, Active(%dMB %s), Inactive(%dMB, %s)\n",
+ p->p_pid, priority, p->p_memstat_dirty,
+ memlimit_active, (memlimit_active_is_fatal ? "F " : "NF"),
+ memlimit_inactive, (memlimit_inactive_is_fatal ? "F " : "NF"));
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_IDLE_DEMOTE) | DBG_FUNC_START, 0, 0, 0, 0, 0);
+ if (memlimit_active <= 0) {
+ /*
+ * This process will have a system_wide task limit when active.
+ * System_wide task limit is always fatal.
+ * It's quite common to see non-fatal flag passed in here.
+ * It's not an error, we just ignore it.
+ */
- current_time = mach_absolute_time();
+ /*
+ * For backward compatibility with some unexplained launchd behavior,
+ * we allow a zero sized limit. But we still enforce system_wide limit
+ * when written to the ledgers.
+ */
- proc_list_lock();
+ if (memlimit_active < 0) {
+ memlimit_active = -1; /* enforces system_wide task limit */
+ }
+ memlimit_active_is_fatal = TRUE;
+ }
- demote_prio_band = JETSAM_PRIORITY_IDLE + 1;
+ if (memlimit_inactive <= 0) {
+ /*
+ * This process will have a system_wide task limit when inactive.
+ * System_wide task limit is always fatal.
+ */
- for (; demote_prio_band < JETSAM_PRIORITY_MAX; demote_prio_band++) {
- if (demote_prio_band != system_procs_aging_band && demote_prio_band != applications_aging_band) {
- continue;
+ memlimit_inactive = -1;
+ memlimit_inactive_is_fatal = TRUE;
}
- demotion_bucket = &memstat_bucket[demote_prio_band];
- p = TAILQ_FIRST(&demotion_bucket->list);
-
- while (p) {
- MEMORYSTATUS_DEBUG(1, "memorystatus_perform_idle_demotion() found %d\n", p->p_pid);
+ /*
+ * Initialize the active limit variants for this process.
+ */
+ SET_ACTIVE_LIMITS_LOCKED(p, memlimit_active, memlimit_active_is_fatal);
- assert(p->p_memstat_idledeadline);
+ /*
+ * Initialize the inactive limit variants for this process.
+ */
+ SET_INACTIVE_LIMITS_LOCKED(p, memlimit_inactive, memlimit_inactive_is_fatal);
- assert(p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS);
+ /*
+ * Initialize the cached limits for target process.
+ * When the target process is dirty tracked, it's typically
+ * in a clean state. Non dirty tracked processes are
+ * typically active (Foreground or above).
+ * But just in case, we don't make assumptions...
+ */
- if (current_time >= p->p_memstat_idledeadline) {
- if ((isSysProc(p) &&
- ((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED | P_DIRTY_IS_DIRTY)) != P_DIRTY_IDLE_EXIT_ENABLED)) || /* system proc marked dirty*/
- task_has_assertions((struct task *)(p->task))) { /* has outstanding assertions which might indicate outstanding work too */
- idle_delay_time = (isSysProc(p)) ? memorystatus_sysprocs_idle_delay_time : memorystatus_apps_idle_delay_time;
+ if (proc_jetsam_state_is_active_locked(p) == TRUE) {
+ CACHE_ACTIVE_LIMITS_LOCKED(p, is_fatal);
+ use_active = TRUE;
+ } else {
+ CACHE_INACTIVE_LIMITS_LOCKED(p, is_fatal);
+ use_active = FALSE;
+ }
- p->p_memstat_idledeadline += idle_delay_time;
- p = TAILQ_NEXT(p, p_memstat_list);
- } else {
- proc_t next_proc = NULL;
+ /*
+ * Enforce the cached limit by writing to the ledger.
+ */
+ if (memorystatus_highwater_enabled) {
+ /* apply now */
+ task_set_phys_footprint_limit_internal(p->task, ((p->p_memstat_memlimit > 0) ? p->p_memstat_memlimit : -1), NULL, use_active, is_fatal);
- next_proc = TAILQ_NEXT(p, p_memstat_list);
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ MEMORYSTATUS_DEBUG(3, "memorystatus_update: init: limit on pid %d (%dMB %s) targeting priority(%d) dirty?=0x%x %s\n",
+ p->p_pid, (p->p_memstat_memlimit > 0 ? p->p_memstat_memlimit : -1),
+ (p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT ? "F " : "NF"), priority, p->p_memstat_dirty,
+ (p->p_memstat_dirty ? ((p->p_memstat_dirty & P_DIRTY) ? "isdirty" : "isclean") : ""));
+ }
+ }
- memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, false, true);
+ /*
+ * We can't add to the aging bands buckets here.
+ * But, we could be removing it from those buckets.
+ * Check and take appropriate steps if so.
+ */
- p = next_proc;
- continue;
- }
- } else {
- // No further candidates
- break;
- }
+ if (isProcessInAgingBands(p)) {
+ if ((jetsam_aging_policy != kJetsamAgingPolicyLegacy) && isApp(p) && (priority > applications_aging_band)) {
+ /*
+ * Runningboardd is pulling up an application that is in the aging band.
+ * We reset the app's state here so that it'll get a fresh stay in the
+ * aging band on the way back.
+ *
+ * We always handled the app 'aging' in the memorystatus_update_priority_locked()
+ * function. Daemons used to be handled via the dirty 'set/clear/track' path.
+ * But with extensions (daemon-app hybrid), runningboardd is now going through
+ * this routine for daemons too and things have gotten a bit tangled. This should
+ * be simplified/untangled at some point and might require some assistance from
+ * runningboardd.
+ */
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ } else {
+ memorystatus_invalidate_idle_demotion_locked(p, FALSE);
+ }
+ memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, FALSE, TRUE);
+ } else {
+ if (jetsam_aging_policy == kJetsamAgingPolicyLegacy && priority == JETSAM_PRIORITY_IDLE) {
+ /*
+ * Daemons with 'inactive' limits will go through the dirty tracking codepath.
+ * This path deals with apps that may have 'inactive' limits e.g. WebContent processes.
+ * If this is the legacy aging policy we explicitly need to apply those limits. If it
+ * is any other aging policy, then we don't need to worry because all processes
+ * will go through the aging bands and then the demotion thread will take care to
+ * move them into the IDLE band and apply the required limits.
+ */
+ memorystatus_update_priority_locked(p, priority, head_insert, TRUE);
}
}
- memorystatus_reschedule_idle_demotion_locked();
+ memorystatus_update_priority_locked(p, priority, head_insert, FALSE);
proc_list_unlock();
+ ret = 0;
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_IDLE_DEMOTE) | DBG_FUNC_END, 0, 0, 0, 0, 0);
+out:
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_UPDATE) | DBG_FUNC_END, ret, 0, 0, 0, 0);
+
+ return ret;
}
-static void
-memorystatus_schedule_idle_demotion_locked(proc_t p, boolean_t set_state)
+int
+memorystatus_remove(proc_t p)
{
- boolean_t present_in_sysprocs_aging_bucket = FALSE;
- boolean_t present_in_apps_aging_bucket = FALSE;
- uint64_t idle_delay_time = 0;
+ int ret;
+ memstat_bucket_t *bucket;
+ boolean_t reschedule = FALSE;
- if (jetsam_aging_policy == kJetsamAgingPolicyNone) {
- return;
+ MEMORYSTATUS_DEBUG(1, "memorystatus_list_remove: removing pid %d\n", p->p_pid);
+
+ /*
+ * Check if this proc is locked (because we're performing a freeze).
+ * If so, we fail and instruct the caller to try again later.
+ */
+ if (p->p_memstat_state & P_MEMSTAT_LOCKED) {
+ return EAGAIN;
}
- if (p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) {
- /*
- * This process isn't going to be making the trip to the lower bands.
- */
- return;
+ assert(!(p->p_memstat_state & P_MEMSTAT_INTERNAL));
+
+ bucket = &memstat_bucket[p->p_memstat_effectivepriority];
+
+ if (isSysProc(p) && system_procs_aging_band && (p->p_memstat_effectivepriority == system_procs_aging_band)) {
+ assert(bucket->count == memorystatus_scheduled_idle_demotions_sysprocs);
+ reschedule = TRUE;
+ } else if (isApp(p) && applications_aging_band && (p->p_memstat_effectivepriority == applications_aging_band)) {
+ assert(bucket->count == memorystatus_scheduled_idle_demotions_apps);
+ reschedule = TRUE;
}
- if (isProcessInAgingBands(p)) {
- if (jetsam_aging_policy != kJetsamAgingPolicyLegacy) {
- assert((p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) != P_DIRTY_AGING_IN_PROGRESS);
- }
+ /*
+ * Record idle delta
+ */
- if (isSysProc(p) && system_procs_aging_band) {
- present_in_sysprocs_aging_bucket = TRUE;
- } else if (isApp(p) && applications_aging_band) {
- present_in_apps_aging_bucket = TRUE;
+ if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE) {
+ uint64_t now = mach_absolute_time();
+ if (now > p->p_memstat_idle_start) {
+ p->p_memstat_idle_delta = now - p->p_memstat_idle_start;
}
}
- assert(!present_in_sysprocs_aging_bucket);
- assert(!present_in_apps_aging_bucket);
+ TAILQ_REMOVE(&bucket->list, p, p_memstat_list);
+ bucket->count--;
+ if (p->p_memstat_relaunch_flags & (P_MEMSTAT_RELAUNCH_HIGH)) {
+ bucket->relaunch_high_count--;
+ }
- MEMORYSTATUS_DEBUG(1, "memorystatus_schedule_idle_demotion_locked: scheduling demotion to idle band for pid %d (dirty:0x%x, set_state %d, demotions %d).\n",
- p->p_pid, p->p_memstat_dirty, set_state, (memorystatus_scheduled_idle_demotions_sysprocs + memorystatus_scheduled_idle_demotions_apps));
+ memorystatus_list_count--;
- if (isSysProc(p)) {
- assert((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED);
+ /* If awaiting demotion to the idle band, clean up */
+ if (reschedule) {
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ memorystatus_reschedule_idle_demotion_locked();
}
- idle_delay_time = (isSysProc(p)) ? memorystatus_sysprocs_idle_delay_time : memorystatus_apps_idle_delay_time;
-
- if (set_state) {
- p->p_memstat_dirty |= P_DIRTY_AGING_IN_PROGRESS;
- p->p_memstat_idledeadline = mach_absolute_time() + idle_delay_time;
- }
+ memorystatus_check_levels_locked();
- assert(p->p_memstat_idledeadline);
+#if CONFIG_FREEZE
+ if (p->p_memstat_state & (P_MEMSTAT_FROZEN)) {
+ if (p->p_memstat_state & P_MEMSTAT_REFREEZE_ELIGIBLE) {
+ p->p_memstat_state &= ~P_MEMSTAT_REFREEZE_ELIGIBLE;
+ memorystatus_refreeze_eligible_count--;
+ }
- if (isSysProc(p) && present_in_sysprocs_aging_bucket == FALSE) {
- memorystatus_scheduled_idle_demotions_sysprocs++;
- } else if (isApp(p) && present_in_apps_aging_bucket == FALSE) {
- memorystatus_scheduled_idle_demotions_apps++;
+ memorystatus_frozen_count--;
+ memorystatus_frozen_shared_mb -= p->p_memstat_freeze_sharedanon_pages;
+ p->p_memstat_freeze_sharedanon_pages = 0;
}
-}
-static void
-memorystatus_invalidate_idle_demotion_locked(proc_t p, boolean_t clear_state)
-{
- boolean_t present_in_sysprocs_aging_bucket = FALSE;
- boolean_t present_in_apps_aging_bucket = FALSE;
+ if (p->p_memstat_state & P_MEMSTAT_SUSPENDED) {
+ memorystatus_suspended_count--;
+ }
+#endif
- if (!system_procs_aging_band && !applications_aging_band) {
- return;
+#if DEVELOPMENT || DEBUG
+ if (p->p_pid == memorystatus_snapshot_owner) {
+ memorystatus_snapshot_owner = 0;
}
+#endif /* DEVELOPMENT || DEBUG */
- if ((p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) == 0) {
- return;
+ if (p) {
+ ret = 0;
+ } else {
+ ret = ESRCH;
}
- if (isProcessInAgingBands(p)) {
- if (jetsam_aging_policy != kJetsamAgingPolicyLegacy) {
- assert((p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) == P_DIRTY_AGING_IN_PROGRESS);
- }
+ return ret;
+}
- if (isSysProc(p) && system_procs_aging_band) {
- assert(p->p_memstat_effectivepriority == system_procs_aging_band);
- assert(p->p_memstat_idledeadline);
- present_in_sysprocs_aging_bucket = TRUE;
- } else if (isApp(p) && applications_aging_band) {
- assert(p->p_memstat_effectivepriority == applications_aging_band);
- assert(p->p_memstat_idledeadline);
- present_in_apps_aging_bucket = TRUE;
- }
+/*
+ * Validate dirty tracking flags with process state.
+ *
+ * Return:
+ * 0 on success
+ * non-0 on failure
+ *
+ * The proc_list_lock is held by the caller.
+ */
+
+static int
+memorystatus_validate_track_flags(struct proc *target_p, uint32_t pcontrol)
+{
+ /* See that the process isn't marked for termination */
+ if (target_p->p_memstat_dirty & P_DIRTY_TERMINATED) {
+ return EBUSY;
}
- MEMORYSTATUS_DEBUG(1, "memorystatus_invalidate_idle_demotion(): invalidating demotion to idle band for pid %d (clear_state %d, demotions %d).\n",
- p->p_pid, clear_state, (memorystatus_scheduled_idle_demotions_sysprocs + memorystatus_scheduled_idle_demotions_apps));
+ /* Idle exit requires that process be tracked */
+ if ((pcontrol & PROC_DIRTY_ALLOW_IDLE_EXIT) &&
+ !(pcontrol & PROC_DIRTY_TRACK)) {
+ return EINVAL;
+ }
+ /* 'Launch in progress' tracking requires that process have enabled dirty tracking too. */
+ if ((pcontrol & PROC_DIRTY_LAUNCH_IN_PROGRESS) &&
+ !(pcontrol & PROC_DIRTY_TRACK)) {
+ return EINVAL;
+ }
- if (clear_state) {
- p->p_memstat_idledeadline = 0;
- p->p_memstat_dirty &= ~P_DIRTY_AGING_IN_PROGRESS;
+ /* Only one type of DEFER behavior is allowed.*/
+ if ((pcontrol & PROC_DIRTY_DEFER) &&
+ (pcontrol & PROC_DIRTY_DEFER_ALWAYS)) {
+ return EINVAL;
}
- if (isSysProc(p) && present_in_sysprocs_aging_bucket == TRUE) {
- memorystatus_scheduled_idle_demotions_sysprocs--;
- assert(memorystatus_scheduled_idle_demotions_sysprocs >= 0);
- } else if (isApp(p) && present_in_apps_aging_bucket == TRUE) {
- memorystatus_scheduled_idle_demotions_apps--;
- assert(memorystatus_scheduled_idle_demotions_apps >= 0);
+ /* Deferral is only relevant if idle exit is specified */
+ if (((pcontrol & PROC_DIRTY_DEFER) ||
+ (pcontrol & PROC_DIRTY_DEFER_ALWAYS)) &&
+ !(pcontrol & PROC_DIRTY_ALLOWS_IDLE_EXIT)) {
+ return EINVAL;
}
- assert((memorystatus_scheduled_idle_demotions_sysprocs + memorystatus_scheduled_idle_demotions_apps) >= 0);
+ return 0;
}
static void
-memorystatus_reschedule_idle_demotion_locked(void)
+memorystatus_update_idle_priority_locked(proc_t p)
{
- if (0 == (memorystatus_scheduled_idle_demotions_sysprocs + memorystatus_scheduled_idle_demotions_apps)) {
- if (memstat_idle_demotion_deadline) {
- /* Transitioned 1->0, so cancel next call */
- thread_call_cancel(memorystatus_idle_demotion_call);
- memstat_idle_demotion_deadline = 0;
- }
- } else {
- memstat_bucket_t *demotion_bucket;
- proc_t p = NULL, p1 = NULL, p2 = NULL;
+ int32_t priority;
- if (system_procs_aging_band) {
- demotion_bucket = &memstat_bucket[system_procs_aging_band];
- p1 = TAILQ_FIRST(&demotion_bucket->list);
+ MEMORYSTATUS_DEBUG(1, "memorystatus_update_idle_priority_locked(): pid %d dirty 0x%X\n", p->p_pid, p->p_memstat_dirty);
- p = p1;
- }
+ assert(isSysProc(p));
- if (applications_aging_band) {
- demotion_bucket = &memstat_bucket[applications_aging_band];
- p2 = TAILQ_FIRST(&demotion_bucket->list);
+ if ((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED | P_DIRTY_IS_DIRTY)) == P_DIRTY_IDLE_EXIT_ENABLED) {
+ priority = (p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) ? system_procs_aging_band : JETSAM_PRIORITY_IDLE;
+ } else {
+ priority = p->p_memstat_requestedpriority;
+ }
- if (p1 && p2) {
- p = (p1->p_memstat_idledeadline > p2->p_memstat_idledeadline) ? p2 : p1;
- } else {
- p = (p1 == NULL) ? p2 : p1;
- }
+ if (p->p_memstat_state & P_MEMSTAT_PRIORITY_ASSERTION) {
+ /*
+ * This process has a jetsam priority managed by an assertion.
+ * Policy is to choose the max priority.
+ */
+ if (p->p_memstat_assertionpriority > priority) {
+ os_log(OS_LOG_DEFAULT, "memorystatus: assertion priority %d overrides priority %d for %s:%d\n",
+ p->p_memstat_assertionpriority, priority,
+ (*p->p_name ? p->p_name : "unknown"), p->p_pid);
+ priority = p->p_memstat_assertionpriority;
}
+ }
- assert(p);
+ if (priority != p->p_memstat_effectivepriority) {
+ if ((jetsam_aging_policy == kJetsamAgingPolicyLegacy) &&
+ (priority == JETSAM_PRIORITY_IDLE)) {
+ /*
+ * This process is on its way into the IDLE band. The system is
+ * using 'legacy' jetsam aging policy. That means, this process
+ * has already used up its idle-deferral aging time that is given
+ * once per its lifetime. So we need to set the INACTIVE limits
+ * explicitly because it won't be going through the demotion paths
+ * that take care to apply the limits appropriately.
+ */
- if (p != NULL) {
- assert(p && p->p_memstat_idledeadline);
- if (memstat_idle_demotion_deadline != p->p_memstat_idledeadline) {
- thread_call_enter_delayed(memorystatus_idle_demotion_call, p->p_memstat_idledeadline);
- memstat_idle_demotion_deadline = p->p_memstat_idledeadline;
+ if (p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) {
+ /*
+ * This process has the 'elevated inactive jetsam band' attribute.
+ * So, there will be no trip to IDLE after all.
+ * Instead, we pin the process in the elevated band,
+ * where its ACTIVE limits will apply.
+ */
+
+ priority = JETSAM_PRIORITY_ELEVATED_INACTIVE;
}
+
+ memorystatus_update_priority_locked(p, priority, false, true);
+ } else {
+ memorystatus_update_priority_locked(p, priority, false, false);
}
}
}
/*
- * List manipulation
+ * Processes can opt to have their state tracked by the kernel, indicating when they are busy (dirty) or idle
+ * (clean). They may also indicate that they support termination when idle, with the result that they are promoted
+ * to their desired, higher, jetsam priority when dirty (and are therefore killed later), and demoted to the low
+ * priority idle band when clean (and killed earlier, protecting higher priority procesess).
+ *
+ * If the deferral flag is set, then newly tracked processes will be protected for an initial period (as determined by
+ * memorystatus_sysprocs_idle_delay_time); if they go clean during this time, then they will be moved to a deferred-idle band
+ * with a slightly higher priority, guarding against immediate termination under memory pressure and being unable to
+ * make forward progress. Finally, when the guard expires, they will be moved to the standard, lowest-priority, idle
+ * band. The deferral can be cleared early by clearing the appropriate flag.
+ *
+ * The deferral timer is active only for the duration that the process is marked as guarded and clean; if the process
+ * is marked dirty, the timer will be cancelled. Upon being subsequently marked clean, the deferment will either be
+ * re-enabled or the guard state cleared, depending on whether the guard deadline has passed.
*/
int
-memorystatus_add(proc_t p, boolean_t locked)
+memorystatus_dirty_track(proc_t p, uint32_t pcontrol)
{
- memstat_bucket_t *bucket;
+ unsigned int old_dirty;
+ boolean_t reschedule = FALSE;
+ boolean_t already_deferred = FALSE;
+ boolean_t defer_now = FALSE;
+ int ret = 0;
- MEMORYSTATUS_DEBUG(1, "memorystatus_list_add(): adding pid %d with priority %d.\n", p->p_pid, p->p_memstat_effectivepriority);
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DIRTY_TRACK),
+ p->p_pid, p->p_memstat_dirty, pcontrol, 0, 0);
- if (!locked) {
- proc_list_lock();
- }
+ proc_list_lock();
- DTRACE_MEMORYSTATUS2(memorystatus_add, proc_t, p, int32_t, p->p_memstat_effectivepriority);
+ if ((p->p_listflag & P_LIST_EXITED) != 0) {
+ /*
+ * Process is on its way out.
+ */
+ ret = EBUSY;
+ goto exit;
+ }
- /* Processes marked internal do not have priority tracked */
if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
+ ret = EPERM;
goto exit;
}
- bucket = &memstat_bucket[p->p_memstat_effectivepriority];
-
- if (isSysProc(p) && system_procs_aging_band && (p->p_memstat_effectivepriority == system_procs_aging_band)) {
- assert(bucket->count == memorystatus_scheduled_idle_demotions_sysprocs - 1);
- } else if (isApp(p) && applications_aging_band && (p->p_memstat_effectivepriority == applications_aging_band)) {
- assert(bucket->count == memorystatus_scheduled_idle_demotions_apps - 1);
- } else if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE) {
- /*
- * Entering the idle band.
- * Record idle start time.
- */
- p->p_memstat_idle_start = mach_absolute_time();
+ if ((ret = memorystatus_validate_track_flags(p, pcontrol)) != 0) {
+ /* error */
+ goto exit;
}
- TAILQ_INSERT_TAIL(&bucket->list, p, p_memstat_list);
- bucket->count++;
+ old_dirty = p->p_memstat_dirty;
- memorystatus_list_count++;
+ /* These bits are cumulative, as per <rdar://problem/11159924> */
+ if (pcontrol & PROC_DIRTY_TRACK) {
+ p->p_memstat_dirty |= P_DIRTY_TRACK;
+ }
- memorystatus_check_levels_locked();
+ if (pcontrol & PROC_DIRTY_ALLOW_IDLE_EXIT) {
+ p->p_memstat_dirty |= P_DIRTY_ALLOW_IDLE_EXIT;
+ }
-exit:
- if (!locked) {
- proc_list_unlock();
+ if (pcontrol & PROC_DIRTY_LAUNCH_IN_PROGRESS) {
+ p->p_memstat_dirty |= P_DIRTY_LAUNCH_IN_PROGRESS;
}
- return 0;
-}
+ if (old_dirty & P_DIRTY_AGING_IN_PROGRESS) {
+ already_deferred = TRUE;
+ }
-/*
- * Description:
- * Moves a process from one jetsam bucket to another.
- * which changes the LRU position of the process.
- *
- * Monitors transition between buckets and if necessary
- * will update cached memory limits accordingly.
- *
- * skip_demotion_check:
- * - if the 'jetsam aging policy' is NOT 'legacy':
- * When this flag is TRUE, it means we are going
- * to age the ripe processes out of the aging bands and into the
- * IDLE band and apply their inactive memory limits.
- *
- * - if the 'jetsam aging policy' is 'legacy':
- * When this flag is TRUE, it might mean the above aging mechanism
- * OR
- * It might be that we have a process that has used up its 'idle deferral'
- * stay that is given to it once per lifetime. And in this case, the process
- * won't be going through any aging codepaths. But we still need to apply
- * the right inactive limits and so we explicitly set this to TRUE if the
- * new priority for the process is the IDLE band.
- */
-void
-memorystatus_update_priority_locked(proc_t p, int priority, boolean_t head_insert, boolean_t skip_demotion_check)
-{
- memstat_bucket_t *old_bucket, *new_bucket;
- assert(priority < MEMSTAT_BUCKET_COUNT);
-
- /* Ensure that exit isn't underway, leaving the proc retained but removed from its bucket */
- if ((p->p_listflag & P_LIST_EXITED) != 0) {
- return;
- }
-
- MEMORYSTATUS_DEBUG(1, "memorystatus_update_priority_locked(): setting %s(%d) to priority %d, inserting at %s\n",
- (*p->p_name ? p->p_name : "unknown"), p->p_pid, priority, head_insert ? "head" : "tail");
+ /* This can be set and cleared exactly once. */
+ if (pcontrol & (PROC_DIRTY_DEFER | PROC_DIRTY_DEFER_ALWAYS)) {
+ if ((pcontrol & (PROC_DIRTY_DEFER)) &&
+ !(old_dirty & P_DIRTY_DEFER)) {
+ p->p_memstat_dirty |= P_DIRTY_DEFER;
+ }
- DTRACE_MEMORYSTATUS3(memorystatus_update_priority, proc_t, p, int32_t, p->p_memstat_effectivepriority, int, priority);
+ if ((pcontrol & (PROC_DIRTY_DEFER_ALWAYS)) &&
+ !(old_dirty & P_DIRTY_DEFER_ALWAYS)) {
+ p->p_memstat_dirty |= P_DIRTY_DEFER_ALWAYS;
+ }
-#if DEVELOPMENT || DEBUG
- if (priority == JETSAM_PRIORITY_IDLE && /* if the process is on its way into the IDLE band */
- skip_demotion_check == FALSE && /* and it isn't via the path that will set the INACTIVE memlimits */
- (p->p_memstat_dirty & P_DIRTY_TRACK) && /* and it has 'DIRTY' tracking enabled */
- ((p->p_memstat_memlimit != p->p_memstat_memlimit_inactive) || /* and we notice that the current limit isn't the right value (inactive) */
- ((p->p_memstat_state & P_MEMSTAT_MEMLIMIT_INACTIVE_FATAL) ? (!(p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT)) : (p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT)))) { /* OR type (fatal vs non-fatal) */
- panic("memorystatus_update_priority_locked: on %s with 0x%x, prio: %d and %d\n", p->p_name, p->p_memstat_state, priority, p->p_memstat_memlimit); /* then we must catch this */
+ defer_now = TRUE;
}
-#endif /* DEVELOPMENT || DEBUG */
- old_bucket = &memstat_bucket[p->p_memstat_effectivepriority];
-
- if (skip_demotion_check == FALSE) {
- if (isSysProc(p)) {
- /*
- * For system processes, the memorystatus_dirty_* routines take care of adding/removing
- * the processes from the aging bands and balancing the demotion counts.
- * We can, however, override that if the process has an 'elevated inactive jetsam band' attribute.
- */
+ MEMORYSTATUS_DEBUG(1, "memorystatus_on_track_dirty(): set idle-exit %s / defer %s / dirty %s for pid %d\n",
+ ((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) ? "Y" : "N",
+ defer_now ? "Y" : "N",
+ p->p_memstat_dirty & P_DIRTY ? "Y" : "N",
+ p->p_pid);
- if (p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) {
+ /* Kick off or invalidate the idle exit deferment if there's a state transition. */
+ if (!(p->p_memstat_dirty & P_DIRTY_IS_DIRTY)) {
+ if ((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) {
+ if (defer_now && !already_deferred) {
/*
- * 2 types of processes can use the non-standard elevated inactive band:
- * - Frozen processes that always land in memorystatus_freeze_jetsam_band
- * OR
- * - processes that specifically opt-in to the elevated inactive support e.g. docked processes.
+ * Request to defer a clean process that's idle-exit enabled
+ * and not already in the jetsam deferred band. Most likely a
+ * new launch.
+ */
+ memorystatus_schedule_idle_demotion_locked(p, TRUE);
+ reschedule = TRUE;
+ } else if (!defer_now) {
+ /*
+ * The process isn't asking for the 'aging' facility.
+ * Could be that it is:
*/
-#if CONFIG_FREEZE
- if (p->p_memstat_state & P_MEMSTAT_FROZEN) {
- if (priority <= memorystatus_freeze_jetsam_band) {
- priority = memorystatus_freeze_jetsam_band;
- }
- } else
-#endif /* CONFIG_FREEZE */
- {
- if (priority <= JETSAM_PRIORITY_ELEVATED_INACTIVE) {
- priority = JETSAM_PRIORITY_ELEVATED_INACTIVE;
- }
- }
- assert(!(p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS));
- }
- } else if (isApp(p)) {
- /*
- * Check to see if the application is being lowered in jetsam priority. If so, and:
- * - it has an 'elevated inactive jetsam band' attribute, then put it in the appropriate band.
- * - it is a normal application, then let it age in the aging band if that policy is in effect.
- */
- if (p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) {
-#if CONFIG_FREEZE
- if (p->p_memstat_state & P_MEMSTAT_FROZEN) {
- if (priority <= memorystatus_freeze_jetsam_band) {
- priority = memorystatus_freeze_jetsam_band;
- }
- } else
-#endif /* CONFIG_FREEZE */
- {
- if (priority <= JETSAM_PRIORITY_ELEVATED_INACTIVE) {
- priority = JETSAM_PRIORITY_ELEVATED_INACTIVE;
- }
- }
- } else {
- if (applications_aging_band) {
- if (p->p_memstat_effectivepriority == applications_aging_band) {
- assert(old_bucket->count == (memorystatus_scheduled_idle_demotions_apps + 1));
- }
+ if (already_deferred) {
+ /*
+ * already in the aging bands. Traditionally,
+ * some processes have tried to use this to
+ * opt out of the 'aging' facility.
+ */
- if ((jetsam_aging_policy != kJetsamAgingPolicyLegacy) && (priority <= applications_aging_band)) {
- assert(!(p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS));
- priority = applications_aging_band;
- memorystatus_schedule_idle_demotion_locked(p, TRUE);
- }
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ } else {
+ /*
+ * agnostic to the 'aging' facility. In that case,
+ * we'll go ahead and opt it in because this is likely
+ * a new launch (clean process, dirty tracking enabled)
+ */
+
+ memorystatus_schedule_idle_demotion_locked(p, TRUE);
}
+
+ reschedule = TRUE;
}
}
- }
+ } else {
+ /*
+ * We are trying to operate on a dirty process. Dirty processes have to
+ * be removed from the deferred band. The question is do we reset the
+ * deferred state or not?
+ *
+ * This could be a legal request like:
+ * - this process had opted into the 'aging' band
+ * - but it's now dirty and requests to opt out.
+ * In this case, we remove the process from the band and reset its
+ * state too. It'll opt back in properly when needed.
+ *
+ * OR, this request could be a user-space bug. E.g.:
+ * - this process had opted into the 'aging' band when clean
+ * - and, then issues another request to again put it into the band except
+ * this time the process is dirty.
+ * The process going dirty, as a transition in memorystatus_dirty_set(), will pull the process out of
+ * the deferred band with its state intact. So our request below is no-op.
+ * But we do it here anyways for coverage.
+ *
+ * memorystatus_update_idle_priority_locked()
+ * single-mindedly treats a dirty process as "cannot be in the aging band".
+ */
- if ((system_procs_aging_band && (priority == system_procs_aging_band)) || (applications_aging_band && (priority == applications_aging_band))) {
- assert(p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS);
+ if (!defer_now && already_deferred) {
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ reschedule = TRUE;
+ } else {
+ boolean_t reset_state = (jetsam_aging_policy != kJetsamAgingPolicyLegacy) ? TRUE : FALSE;
+
+ memorystatus_invalidate_idle_demotion_locked(p, reset_state);
+ reschedule = TRUE;
+ }
}
- TAILQ_REMOVE(&old_bucket->list, p, p_memstat_list);
- old_bucket->count--;
+ memorystatus_update_idle_priority_locked(p);
- new_bucket = &memstat_bucket[priority];
- if (head_insert) {
- TAILQ_INSERT_HEAD(&new_bucket->list, p, p_memstat_list);
- } else {
- TAILQ_INSERT_TAIL(&new_bucket->list, p, p_memstat_list);
+ if (reschedule) {
+ memorystatus_reschedule_idle_demotion_locked();
}
- new_bucket->count++;
- if (memorystatus_highwater_enabled) {
- boolean_t is_fatal;
- boolean_t use_active;
+ ret = 0;
+
+exit:
+ proc_list_unlock();
+
+ return ret;
+}
+
+int
+memorystatus_dirty_set(proc_t p, boolean_t self, uint32_t pcontrol)
+{
+ int ret;
+ boolean_t kill = false;
+ boolean_t reschedule = FALSE;
+ boolean_t was_dirty = FALSE;
+ boolean_t now_dirty = FALSE;
+#if CONFIG_DIRTYSTATUS_TRACKING
+ boolean_t notify_change = FALSE;
+ dirty_status_change_event_t change_event;
+#endif
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_dirty_set(): %d %d 0x%x 0x%x\n", self, p->p_pid, pcontrol, p->p_memstat_dirty);
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DIRTY_SET), p->p_pid, self, pcontrol, 0, 0);
+
+ proc_list_lock();
+ if ((p->p_listflag & P_LIST_EXITED) != 0) {
/*
- * If cached limit data is updated, then the limits
- * will be enforced by writing to the ledgers.
+ * Process is on its way out.
*/
- boolean_t ledger_update_needed = TRUE;
+ ret = EBUSY;
+ goto exit;
+ }
+
+ if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
+ ret = EPERM;
+ goto exit;
+ }
+
+ if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
+ was_dirty = TRUE;
+ }
+ if (!(p->p_memstat_dirty & P_DIRTY_TRACK)) {
+ /* Dirty tracking not enabled */
+ ret = EINVAL;
+ } else if (pcontrol && (p->p_memstat_dirty & P_DIRTY_TERMINATED)) {
/*
- * Here, we must update the cached memory limit if the task
- * is transitioning between:
- * active <--> inactive
- * FG <--> BG
- * but:
- * dirty <--> clean is ignored
- *
- * We bypass non-idle processes that have opted into dirty tracking because
- * a move between buckets does not imply a transition between the
- * dirty <--> clean state.
- */
-
- if (p->p_memstat_dirty & P_DIRTY_TRACK) {
- if (skip_demotion_check == TRUE && priority == JETSAM_PRIORITY_IDLE) {
- CACHE_INACTIVE_LIMITS_LOCKED(p, is_fatal);
- use_active = FALSE;
- } else {
- ledger_update_needed = FALSE;
- }
- } else if ((priority >= JETSAM_PRIORITY_FOREGROUND) && (p->p_memstat_effectivepriority < JETSAM_PRIORITY_FOREGROUND)) {
- /*
- * inactive --> active
- * BG --> FG
- * assign active state
- */
- CACHE_ACTIVE_LIMITS_LOCKED(p, is_fatal);
- use_active = TRUE;
- } else if ((priority < JETSAM_PRIORITY_FOREGROUND) && (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND)) {
- /*
- * active --> inactive
- * FG --> BG
- * assign inactive state
- */
- CACHE_INACTIVE_LIMITS_LOCKED(p, is_fatal);
- use_active = FALSE;
- } else {
- /*
- * The transition between jetsam priority buckets apparently did
- * not affect active/inactive state.
- * This is not unusual... especially during startup when
- * processes are getting established in their respective bands.
- */
- ledger_update_needed = FALSE;
- }
-
- /*
- * Enforce the new limits by writing to the ledger
- */
- if (ledger_update_needed) {
- task_set_phys_footprint_limit_internal(p->task, (p->p_memstat_memlimit > 0) ? p->p_memstat_memlimit : -1, NULL, use_active, is_fatal);
-
- MEMORYSTATUS_DEBUG(3, "memorystatus_update_priority_locked: new limit on pid %d (%dMB %s) priority old --> new (%d --> %d) dirty?=0x%x %s\n",
- p->p_pid, (p->p_memstat_memlimit > 0 ? p->p_memstat_memlimit : -1),
- (p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT ? "F " : "NF"), p->p_memstat_effectivepriority, priority, p->p_memstat_dirty,
- (p->p_memstat_dirty ? ((p->p_memstat_dirty & P_DIRTY) ? "isdirty" : "isclean") : ""));
- }
- }
-
- /*
- * Record idle start or idle delta.
- */
- if (p->p_memstat_effectivepriority == priority) {
- /*
- * This process is not transitioning between
- * jetsam priority buckets. Do nothing.
- */
- } else if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE) {
- uint64_t now;
- /*
- * Transitioning out of the idle priority bucket.
- * Record idle delta.
- */
- assert(p->p_memstat_idle_start != 0);
- now = mach_absolute_time();
- if (now > p->p_memstat_idle_start) {
- p->p_memstat_idle_delta = now - p->p_memstat_idle_start;
- }
-
- /*
- * About to become active and so memory footprint could change.
- * So mark it eligible for freeze-considerations next time around.
- */
- if (p->p_memstat_state & P_MEMSTAT_FREEZE_IGNORE) {
- p->p_memstat_state &= ~P_MEMSTAT_FREEZE_IGNORE;
- }
- } else if (priority == JETSAM_PRIORITY_IDLE) {
- /*
- * Transitioning into the idle priority bucket.
- * Record idle start.
- */
- p->p_memstat_idle_start = mach_absolute_time();
- }
-
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_CHANGE_PRIORITY), p->p_pid, priority, p->p_memstat_effectivepriority, 0, 0);
-
- p->p_memstat_effectivepriority = priority;
-
-#if CONFIG_SECLUDED_MEMORY
- if (secluded_for_apps &&
- task_could_use_secluded_mem(p->task)) {
- task_set_can_use_secluded_mem(
- p->task,
- (priority >= JETSAM_PRIORITY_FOREGROUND));
- }
-#endif /* CONFIG_SECLUDED_MEMORY */
-
- memorystatus_check_levels_locked();
-}
-
-/*
- *
- * Description: Update the jetsam priority and memory limit attributes for a given process.
- *
- * Parameters:
- * p init this process's jetsam information.
- * priority The jetsam priority band
- * user_data user specific data, unused by the kernel
- * effective guards against race if process's update already occurred
- * update_memlimit When true we know this is the init step via the posix_spawn path.
- *
- * memlimit_active Value in megabytes; The monitored footprint level while the
- * process is active. Exceeding it may result in termination
- * based on it's associated fatal flag.
- *
- * memlimit_active_is_fatal When a process is active and exceeds its memory footprint,
- * this describes whether or not it should be immediately fatal.
- *
- * memlimit_inactive Value in megabytes; The monitored footprint level while the
- * process is inactive. Exceeding it may result in termination
- * based on it's associated fatal flag.
- *
- * memlimit_inactive_is_fatal When a process is inactive and exceeds its memory footprint,
- * this describes whether or not it should be immediatly fatal.
- *
- * Returns: 0 Success
- * non-0 Failure
- */
-
-int
-memorystatus_update(proc_t p, int priority, uint64_t user_data, boolean_t effective, boolean_t update_memlimit,
- int32_t memlimit_active, boolean_t memlimit_active_is_fatal,
- int32_t memlimit_inactive, boolean_t memlimit_inactive_is_fatal)
-{
- int ret;
- boolean_t head_insert = false;
-
- MEMORYSTATUS_DEBUG(1, "memorystatus_update: changing (%s) pid %d: priority %d, user_data 0x%llx\n", (*p->p_name ? p->p_name : "unknown"), p->p_pid, priority, user_data);
-
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_UPDATE) | DBG_FUNC_START, p->p_pid, priority, user_data, effective, 0);
-
- if (priority == -1) {
- /* Use as shorthand for default priority */
- priority = JETSAM_PRIORITY_DEFAULT;
- } else if ((priority == system_procs_aging_band) || (priority == applications_aging_band)) {
- /* Both the aging bands are reserved for internal use; if requested, adjust to JETSAM_PRIORITY_IDLE. */
- priority = JETSAM_PRIORITY_IDLE;
- } else if (priority == JETSAM_PRIORITY_IDLE_HEAD) {
- /* JETSAM_PRIORITY_IDLE_HEAD inserts at the head of the idle queue */
- priority = JETSAM_PRIORITY_IDLE;
- head_insert = TRUE;
- } else if ((priority < 0) || (priority >= MEMSTAT_BUCKET_COUNT)) {
- /* Sanity check */
- ret = EINVAL;
- goto out;
- }
-
- proc_list_lock();
-
- assert(!(p->p_memstat_state & P_MEMSTAT_INTERNAL));
-
- if (effective && (p->p_memstat_state & P_MEMSTAT_PRIORITYUPDATED)) {
- ret = EALREADY;
- proc_list_unlock();
- MEMORYSTATUS_DEBUG(1, "memorystatus_update: effective change specified for pid %d, but change already occurred.\n", p->p_pid);
- goto out;
- }
-
- if ((p->p_memstat_state & P_MEMSTAT_TERMINATED) || ((p->p_listflag & P_LIST_EXITED) != 0)) {
- /*
- * This could happen when a process calling posix_spawn() is exiting on the jetsam thread.
+ * Process is set to be terminated and we're attempting to mark it dirty.
+ * Set for termination and marking as clean is OK - see <rdar://problem/10594349>.
*/
ret = EBUSY;
- proc_list_unlock();
- goto out;
- }
-
- p->p_memstat_state |= P_MEMSTAT_PRIORITYUPDATED;
- p->p_memstat_userdata = user_data;
- p->p_memstat_requestedpriority = priority;
-
- if (update_memlimit) {
- boolean_t is_fatal;
- boolean_t use_active;
-
- /*
- * Posix_spawn'd processes come through this path to instantiate ledger limits.
- * Forked processes do not come through this path, so no ledger limits exist.
- * (That's why forked processes can consume unlimited memory.)
- */
-
- MEMORYSTATUS_DEBUG(3, "memorystatus_update(enter): pid %d, priority %d, dirty=0x%x, Active(%dMB %s), Inactive(%dMB, %s)\n",
- p->p_pid, priority, p->p_memstat_dirty,
- memlimit_active, (memlimit_active_is_fatal ? "F " : "NF"),
- memlimit_inactive, (memlimit_inactive_is_fatal ? "F " : "NF"));
-
- if (memlimit_active <= 0) {
- /*
- * This process will have a system_wide task limit when active.
- * System_wide task limit is always fatal.
- * It's quite common to see non-fatal flag passed in here.
- * It's not an error, we just ignore it.
- */
-
- /*
- * For backward compatibility with some unexplained launchd behavior,
- * we allow a zero sized limit. But we still enforce system_wide limit
- * when written to the ledgers.
- */
-
- if (memlimit_active < 0) {
- memlimit_active = -1; /* enforces system_wide task limit */
- }
- memlimit_active_is_fatal = TRUE;
- }
-
- if (memlimit_inactive <= 0) {
- /*
- * This process will have a system_wide task limit when inactive.
- * System_wide task limit is always fatal.
- */
-
- memlimit_inactive = -1;
- memlimit_inactive_is_fatal = TRUE;
- }
-
- /*
- * Initialize the active limit variants for this process.
- */
- SET_ACTIVE_LIMITS_LOCKED(p, memlimit_active, memlimit_active_is_fatal);
-
- /*
- * Initialize the inactive limit variants for this process.
- */
- SET_INACTIVE_LIMITS_LOCKED(p, memlimit_inactive, memlimit_inactive_is_fatal);
-
- /*
- * Initialize the cached limits for target process.
- * When the target process is dirty tracked, it's typically
- * in a clean state. Non dirty tracked processes are
- * typically active (Foreground or above).
- * But just in case, we don't make assumptions...
- */
-
- if (proc_jetsam_state_is_active_locked(p) == TRUE) {
- CACHE_ACTIVE_LIMITS_LOCKED(p, is_fatal);
- use_active = TRUE;
- } else {
- CACHE_INACTIVE_LIMITS_LOCKED(p, is_fatal);
- use_active = FALSE;
- }
-
- /*
- * Enforce the cached limit by writing to the ledger.
- */
- if (memorystatus_highwater_enabled) {
- /* apply now */
- task_set_phys_footprint_limit_internal(p->task, ((p->p_memstat_memlimit > 0) ? p->p_memstat_memlimit : -1), NULL, use_active, is_fatal);
-
- MEMORYSTATUS_DEBUG(3, "memorystatus_update: init: limit on pid %d (%dMB %s) targeting priority(%d) dirty?=0x%x %s\n",
- p->p_pid, (p->p_memstat_memlimit > 0 ? p->p_memstat_memlimit : -1),
- (p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT ? "F " : "NF"), priority, p->p_memstat_dirty,
- (p->p_memstat_dirty ? ((p->p_memstat_dirty & P_DIRTY) ? "isdirty" : "isclean") : ""));
- }
- }
-
- /*
- * We can't add to the aging bands buckets here.
- * But, we could be removing it from those buckets.
- * Check and take appropriate steps if so.
- */
-
- if (isProcessInAgingBands(p)) {
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
- memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, FALSE, TRUE);
- } else {
- if (jetsam_aging_policy == kJetsamAgingPolicyLegacy && priority == JETSAM_PRIORITY_IDLE) {
- /*
- * Daemons with 'inactive' limits will go through the dirty tracking codepath.
- * This path deals with apps that may have 'inactive' limits e.g. WebContent processes.
- * If this is the legacy aging policy we explicitly need to apply those limits. If it
- * is any other aging policy, then we don't need to worry because all processes
- * will go through the aging bands and then the demotion thread will take care to
- * move them into the IDLE band and apply the required limits.
- */
- memorystatus_update_priority_locked(p, priority, head_insert, TRUE);
- }
- }
-
- memorystatus_update_priority_locked(p, priority, head_insert, FALSE);
-
- proc_list_unlock();
- ret = 0;
-
-out:
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_UPDATE) | DBG_FUNC_END, ret, 0, 0, 0, 0);
-
- return ret;
-}
-
-int
-memorystatus_remove(proc_t p, boolean_t locked)
-{
- int ret;
- memstat_bucket_t *bucket;
- boolean_t reschedule = FALSE;
-
- MEMORYSTATUS_DEBUG(1, "memorystatus_list_remove: removing pid %d\n", p->p_pid);
-
- if (!locked) {
- proc_list_lock();
- }
-
- assert(!(p->p_memstat_state & P_MEMSTAT_INTERNAL));
-
- bucket = &memstat_bucket[p->p_memstat_effectivepriority];
-
- if (isSysProc(p) && system_procs_aging_band && (p->p_memstat_effectivepriority == system_procs_aging_band)) {
- assert(bucket->count == memorystatus_scheduled_idle_demotions_sysprocs);
- reschedule = TRUE;
- } else if (isApp(p) && applications_aging_band && (p->p_memstat_effectivepriority == applications_aging_band)) {
- assert(bucket->count == memorystatus_scheduled_idle_demotions_apps);
- reschedule = TRUE;
- }
-
- /*
- * Record idle delta
- */
-
- if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE) {
- uint64_t now = mach_absolute_time();
- if (now > p->p_memstat_idle_start) {
- p->p_memstat_idle_delta = now - p->p_memstat_idle_start;
- }
- }
-
- TAILQ_REMOVE(&bucket->list, p, p_memstat_list);
- bucket->count--;
-
- memorystatus_list_count--;
-
- /* If awaiting demotion to the idle band, clean up */
- if (reschedule) {
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
- memorystatus_reschedule_idle_demotion_locked();
- }
-
- memorystatus_check_levels_locked();
-
-#if CONFIG_FREEZE
- if (p->p_memstat_state & (P_MEMSTAT_FROZEN)) {
- if (p->p_memstat_state & P_MEMSTAT_REFREEZE_ELIGIBLE) {
- p->p_memstat_state &= ~P_MEMSTAT_REFREEZE_ELIGIBLE;
- memorystatus_refreeze_eligible_count--;
- }
-
- memorystatus_frozen_count--;
- memorystatus_frozen_shared_mb -= p->p_memstat_freeze_sharedanon_pages;
- p->p_memstat_freeze_sharedanon_pages = 0;
- }
-
- if (p->p_memstat_state & P_MEMSTAT_SUSPENDED) {
- memorystatus_suspended_count--;
- }
-#endif
-
- if (!locked) {
- proc_list_unlock();
- }
-
- if (p) {
- ret = 0;
- } else {
- ret = ESRCH;
- }
-
- return ret;
-}
-
-/*
- * Validate dirty tracking flags with process state.
- *
- * Return:
- * 0 on success
- * non-0 on failure
- *
- * The proc_list_lock is held by the caller.
- */
-
-static int
-memorystatus_validate_track_flags(struct proc *target_p, uint32_t pcontrol)
-{
- /* See that the process isn't marked for termination */
- if (target_p->p_memstat_dirty & P_DIRTY_TERMINATED) {
- return EBUSY;
- }
-
- /* Idle exit requires that process be tracked */
- if ((pcontrol & PROC_DIRTY_ALLOW_IDLE_EXIT) &&
- !(pcontrol & PROC_DIRTY_TRACK)) {
- return EINVAL;
- }
-
- /* 'Launch in progress' tracking requires that process have enabled dirty tracking too. */
- if ((pcontrol & PROC_DIRTY_LAUNCH_IN_PROGRESS) &&
- !(pcontrol & PROC_DIRTY_TRACK)) {
- return EINVAL;
- }
-
- /* Only one type of DEFER behavior is allowed.*/
- if ((pcontrol & PROC_DIRTY_DEFER) &&
- (pcontrol & PROC_DIRTY_DEFER_ALWAYS)) {
- return EINVAL;
- }
-
- /* Deferral is only relevant if idle exit is specified */
- if (((pcontrol & PROC_DIRTY_DEFER) ||
- (pcontrol & PROC_DIRTY_DEFER_ALWAYS)) &&
- !(pcontrol & PROC_DIRTY_ALLOWS_IDLE_EXIT)) {
- return EINVAL;
- }
-
- return 0;
-}
-
-static void
-memorystatus_update_idle_priority_locked(proc_t p)
-{
- int32_t priority;
-
- MEMORYSTATUS_DEBUG(1, "memorystatus_update_idle_priority_locked(): pid %d dirty 0x%X\n", p->p_pid, p->p_memstat_dirty);
-
- assert(isSysProc(p));
-
- if ((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED | P_DIRTY_IS_DIRTY)) == P_DIRTY_IDLE_EXIT_ENABLED) {
- priority = (p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) ? system_procs_aging_band : JETSAM_PRIORITY_IDLE;
- } else {
- priority = p->p_memstat_requestedpriority;
- }
-
- if (priority != p->p_memstat_effectivepriority) {
- if ((jetsam_aging_policy == kJetsamAgingPolicyLegacy) &&
- (priority == JETSAM_PRIORITY_IDLE)) {
- /*
- * This process is on its way into the IDLE band. The system is
- * using 'legacy' jetsam aging policy. That means, this process
- * has already used up its idle-deferral aging time that is given
- * once per its lifetime. So we need to set the INACTIVE limits
- * explicitly because it won't be going through the demotion paths
- * that take care to apply the limits appropriately.
- */
-
- if (p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) {
- /*
- * This process has the 'elevated inactive jetsam band' attribute.
- * So, there will be no trip to IDLE after all.
- * Instead, we pin the process in the elevated band,
- * where its ACTIVE limits will apply.
- */
-
- priority = JETSAM_PRIORITY_ELEVATED_INACTIVE;
- }
-
- memorystatus_update_priority_locked(p, priority, false, true);
- } else {
- memorystatus_update_priority_locked(p, priority, false, false);
- }
- }
-}
-
-/*
- * Processes can opt to have their state tracked by the kernel, indicating when they are busy (dirty) or idle
- * (clean). They may also indicate that they support termination when idle, with the result that they are promoted
- * to their desired, higher, jetsam priority when dirty (and are therefore killed later), and demoted to the low
- * priority idle band when clean (and killed earlier, protecting higher priority procesess).
- *
- * If the deferral flag is set, then newly tracked processes will be protected for an initial period (as determined by
- * memorystatus_sysprocs_idle_delay_time); if they go clean during this time, then they will be moved to a deferred-idle band
- * with a slightly higher priority, guarding against immediate termination under memory pressure and being unable to
- * make forward progress. Finally, when the guard expires, they will be moved to the standard, lowest-priority, idle
- * band. The deferral can be cleared early by clearing the appropriate flag.
- *
- * The deferral timer is active only for the duration that the process is marked as guarded and clean; if the process
- * is marked dirty, the timer will be cancelled. Upon being subsequently marked clean, the deferment will either be
- * re-enabled or the guard state cleared, depending on whether the guard deadline has passed.
- */
-
-int
-memorystatus_dirty_track(proc_t p, uint32_t pcontrol)
-{
- unsigned int old_dirty;
- boolean_t reschedule = FALSE;
- boolean_t already_deferred = FALSE;
- boolean_t defer_now = FALSE;
- int ret = 0;
-
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DIRTY_TRACK),
- p->p_pid, p->p_memstat_dirty, pcontrol, 0, 0);
-
- proc_list_lock();
-
- if ((p->p_listflag & P_LIST_EXITED) != 0) {
- /*
- * Process is on its way out.
- */
- ret = EBUSY;
- goto exit;
- }
-
- if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
- ret = EPERM;
- goto exit;
- }
-
- if ((ret = memorystatus_validate_track_flags(p, pcontrol)) != 0) {
- /* error */
- goto exit;
- }
-
- old_dirty = p->p_memstat_dirty;
-
- /* These bits are cumulative, as per <rdar://problem/11159924> */
- if (pcontrol & PROC_DIRTY_TRACK) {
- p->p_memstat_dirty |= P_DIRTY_TRACK;
- }
-
- if (pcontrol & PROC_DIRTY_ALLOW_IDLE_EXIT) {
- p->p_memstat_dirty |= P_DIRTY_ALLOW_IDLE_EXIT;
- }
-
- if (pcontrol & PROC_DIRTY_LAUNCH_IN_PROGRESS) {
- p->p_memstat_dirty |= P_DIRTY_LAUNCH_IN_PROGRESS;
- }
-
- if (old_dirty & P_DIRTY_AGING_IN_PROGRESS) {
- already_deferred = TRUE;
- }
-
-
- /* This can be set and cleared exactly once. */
- if (pcontrol & (PROC_DIRTY_DEFER | PROC_DIRTY_DEFER_ALWAYS)) {
- if ((pcontrol & (PROC_DIRTY_DEFER)) &&
- !(old_dirty & P_DIRTY_DEFER)) {
- p->p_memstat_dirty |= P_DIRTY_DEFER;
- }
-
- if ((pcontrol & (PROC_DIRTY_DEFER_ALWAYS)) &&
- !(old_dirty & P_DIRTY_DEFER_ALWAYS)) {
- p->p_memstat_dirty |= P_DIRTY_DEFER_ALWAYS;
- }
-
- defer_now = TRUE;
- }
-
- MEMORYSTATUS_DEBUG(1, "memorystatus_on_track_dirty(): set idle-exit %s / defer %s / dirty %s for pid %d\n",
- ((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) ? "Y" : "N",
- defer_now ? "Y" : "N",
- p->p_memstat_dirty & P_DIRTY ? "Y" : "N",
- p->p_pid);
-
- /* Kick off or invalidate the idle exit deferment if there's a state transition. */
- if (!(p->p_memstat_dirty & P_DIRTY_IS_DIRTY)) {
- if ((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) {
- if (defer_now && !already_deferred) {
- /*
- * Request to defer a clean process that's idle-exit enabled
- * and not already in the jetsam deferred band. Most likely a
- * new launch.
- */
- memorystatus_schedule_idle_demotion_locked(p, TRUE);
- reschedule = TRUE;
- } else if (!defer_now) {
- /*
- * The process isn't asking for the 'aging' facility.
- * Could be that it is:
- */
-
- if (already_deferred) {
- /*
- * already in the aging bands. Traditionally,
- * some processes have tried to use this to
- * opt out of the 'aging' facility.
- */
-
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
- } else {
- /*
- * agnostic to the 'aging' facility. In that case,
- * we'll go ahead and opt it in because this is likely
- * a new launch (clean process, dirty tracking enabled)
- */
-
- memorystatus_schedule_idle_demotion_locked(p, TRUE);
- }
-
- reschedule = TRUE;
- }
- }
- } else {
- /*
- * We are trying to operate on a dirty process. Dirty processes have to
- * be removed from the deferred band. The question is do we reset the
- * deferred state or not?
- *
- * This could be a legal request like:
- * - this process had opted into the 'aging' band
- * - but it's now dirty and requests to opt out.
- * In this case, we remove the process from the band and reset its
- * state too. It'll opt back in properly when needed.
- *
- * OR, this request could be a user-space bug. E.g.:
- * - this process had opted into the 'aging' band when clean
- * - and, then issues another request to again put it into the band except
- * this time the process is dirty.
- * The process going dirty, as a transition in memorystatus_dirty_set(), will pull the process out of
- * the deferred band with its state intact. So our request below is no-op.
- * But we do it here anyways for coverage.
- *
- * memorystatus_update_idle_priority_locked()
- * single-mindedly treats a dirty process as "cannot be in the aging band".
- */
-
- if (!defer_now && already_deferred) {
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
- reschedule = TRUE;
- } else {
- boolean_t reset_state = (jetsam_aging_policy != kJetsamAgingPolicyLegacy) ? TRUE : FALSE;
-
- memorystatus_invalidate_idle_demotion_locked(p, reset_state);
- reschedule = TRUE;
- }
- }
-
- memorystatus_update_idle_priority_locked(p);
-
- if (reschedule) {
- memorystatus_reschedule_idle_demotion_locked();
- }
-
- ret = 0;
-
-exit:
- proc_list_unlock();
-
- return ret;
-}
-
-int
-memorystatus_dirty_set(proc_t p, boolean_t self, uint32_t pcontrol)
-{
- int ret;
- boolean_t kill = false;
- boolean_t reschedule = FALSE;
- boolean_t was_dirty = FALSE;
- boolean_t now_dirty = FALSE;
-
- MEMORYSTATUS_DEBUG(1, "memorystatus_dirty_set(): %d %d 0x%x 0x%x\n", self, p->p_pid, pcontrol, p->p_memstat_dirty);
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DIRTY_SET), p->p_pid, self, pcontrol, 0, 0);
-
- proc_list_lock();
-
- if ((p->p_listflag & P_LIST_EXITED) != 0) {
- /*
- * Process is on its way out.
- */
- ret = EBUSY;
- goto exit;
- }
-
- if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
- ret = EPERM;
- goto exit;
- }
-
- if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
- was_dirty = TRUE;
- }
-
- if (!(p->p_memstat_dirty & P_DIRTY_TRACK)) {
- /* Dirty tracking not enabled */
- ret = EINVAL;
- } else if (pcontrol && (p->p_memstat_dirty & P_DIRTY_TERMINATED)) {
- /*
- * Process is set to be terminated and we're attempting to mark it dirty.
- * Set for termination and marking as clean is OK - see <rdar://problem/10594349>.
- */
- ret = EBUSY;
- } else {
- int flag = (self == TRUE) ? P_DIRTY : P_DIRTY_SHUTDOWN;
- if (pcontrol && !(p->p_memstat_dirty & flag)) {
- /* Mark the process as having been dirtied at some point */
- p->p_memstat_dirty |= (flag | P_DIRTY_MARKED);
- memorystatus_dirty_count++;
- ret = 0;
- } else if ((pcontrol == 0) && (p->p_memstat_dirty & flag)) {
- if ((flag == P_DIRTY_SHUTDOWN) && (!(p->p_memstat_dirty & P_DIRTY))) {
- /* Clearing the dirty shutdown flag, and the process is otherwise clean - kill */
- p->p_memstat_dirty |= P_DIRTY_TERMINATED;
- kill = true;
- } else if ((flag == P_DIRTY) && (p->p_memstat_dirty & P_DIRTY_TERMINATED)) {
- /* Kill previously terminated processes if set clean */
- kill = true;
- }
- p->p_memstat_dirty &= ~flag;
- memorystatus_dirty_count--;
- ret = 0;
- } else {
- /* Already set */
- ret = EALREADY;
- }
- }
-
- if (ret != 0) {
- goto exit;
- }
-
- if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
- now_dirty = TRUE;
- }
-
- if ((was_dirty == TRUE && now_dirty == FALSE) ||
- (was_dirty == FALSE && now_dirty == TRUE)) {
- /* Manage idle exit deferral, if applied */
- if ((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) {
- /*
- * Legacy mode: P_DIRTY_AGING_IN_PROGRESS means the process is in the aging band OR it might be heading back
- * there once it's clean again. For the legacy case, this only applies if it has some protection window left.
- * P_DIRTY_DEFER: one-time protection window given at launch
- * P_DIRTY_DEFER_ALWAYS: protection window given for every dirty->clean transition. Like non-legacy mode.
- *
- * Non-Legacy mode: P_DIRTY_AGING_IN_PROGRESS means the process is in the aging band. It will always stop over
- * in that band on it's way to IDLE.
- */
-
- if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
- /*
- * New dirty process i.e. "was_dirty == FALSE && now_dirty == TRUE"
- *
- * The process will move from its aging band to its higher requested
- * jetsam band.
- */
- boolean_t reset_state = (jetsam_aging_policy != kJetsamAgingPolicyLegacy) ? TRUE : FALSE;
-
- memorystatus_invalidate_idle_demotion_locked(p, reset_state);
- reschedule = TRUE;
- } else {
- /*
- * Process is back from "dirty" to "clean".
- */
-
- if (jetsam_aging_policy == kJetsamAgingPolicyLegacy) {
- if (((p->p_memstat_dirty & P_DIRTY_DEFER_ALWAYS) == FALSE) &&
- (mach_absolute_time() >= p->p_memstat_idledeadline)) {
- /*
- * The process' hasn't enrolled in the "always defer after dirty"
- * mode and its deadline has expired. It currently
- * does not reside in any of the aging buckets.
- *
- * It's on its way to the JETSAM_PRIORITY_IDLE
- * bucket via memorystatus_update_idle_priority_locked()
- * below.
- *
- * So all we need to do is reset all the state on the
- * process that's related to the aging bucket i.e.
- * the AGING_IN_PROGRESS flag and the timer deadline.
- */
-
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
- reschedule = TRUE;
- } else {
- /*
- * Process enrolled in "always stop in deferral band after dirty" OR
- * it still has some protection window left and so
- * we just re-arm the timer without modifying any
- * state on the process iff it still wants into that band.
- */
-
- if (p->p_memstat_dirty & P_DIRTY_DEFER_ALWAYS) {
- memorystatus_schedule_idle_demotion_locked(p, TRUE);
- reschedule = TRUE;
- } else if (p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) {
- memorystatus_schedule_idle_demotion_locked(p, FALSE);
- reschedule = TRUE;
- }
- }
- } else {
- memorystatus_schedule_idle_demotion_locked(p, TRUE);
- reschedule = TRUE;
- }
- }
- }
-
- memorystatus_update_idle_priority_locked(p);
-
- if (memorystatus_highwater_enabled) {
- boolean_t ledger_update_needed = TRUE;
- boolean_t use_active;
- boolean_t is_fatal;
- /*
- * We are in this path because this process transitioned between
- * dirty <--> clean state. Update the cached memory limits.
- */
-
- if (proc_jetsam_state_is_active_locked(p) == TRUE) {
- /*
- * process is pinned in elevated band
- * or
- * process is dirty
- */
- CACHE_ACTIVE_LIMITS_LOCKED(p, is_fatal);
- use_active = TRUE;
- ledger_update_needed = TRUE;
- } else {
- /*
- * process is clean...but if it has opted into pressured-exit
- * we don't apply the INACTIVE limit till the process has aged
- * out and is entering the IDLE band.
- * See memorystatus_update_priority_locked() for that.
- */
-
- if (p->p_memstat_dirty & P_DIRTY_ALLOW_IDLE_EXIT) {
- ledger_update_needed = FALSE;
- } else {
- CACHE_INACTIVE_LIMITS_LOCKED(p, is_fatal);
- use_active = FALSE;
- ledger_update_needed = TRUE;
- }
- }
-
- /*
- * Enforce the new limits by writing to the ledger.
- *
- * This is a hot path and holding the proc_list_lock while writing to the ledgers,
- * (where the task lock is taken) is bad. So, we temporarily drop the proc_list_lock.
- * We aren't traversing the jetsam bucket list here, so we should be safe.
- * See rdar://21394491.
- */
-
- if (ledger_update_needed && proc_ref_locked(p) == p) {
- int ledger_limit;
- if (p->p_memstat_memlimit > 0) {
- ledger_limit = p->p_memstat_memlimit;
- } else {
- ledger_limit = -1;
- }
- proc_list_unlock();
- task_set_phys_footprint_limit_internal(p->task, ledger_limit, NULL, use_active, is_fatal);
- proc_list_lock();
- proc_rele_locked(p);
-
- MEMORYSTATUS_DEBUG(3, "memorystatus_dirty_set: new limit on pid %d (%dMB %s) priority(%d) dirty?=0x%x %s\n",
- p->p_pid, (p->p_memstat_memlimit > 0 ? p->p_memstat_memlimit : -1),
- (p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT ? "F " : "NF"), p->p_memstat_effectivepriority, p->p_memstat_dirty,
- (p->p_memstat_dirty ? ((p->p_memstat_dirty & P_DIRTY) ? "isdirty" : "isclean") : ""));
- }
- }
-
- /* If the deferral state changed, reschedule the demotion timer */
- if (reschedule) {
- memorystatus_reschedule_idle_demotion_locked();
- }
- }
-
- if (kill) {
- if (proc_ref_locked(p) == p) {
- proc_list_unlock();
- psignal(p, SIGKILL);
- proc_list_lock();
- proc_rele_locked(p);
- }
- }
-
-exit:
- proc_list_unlock();
-
- return ret;
-}
-
-int
-memorystatus_dirty_clear(proc_t p, uint32_t pcontrol)
-{
- int ret = 0;
-
- MEMORYSTATUS_DEBUG(1, "memorystatus_dirty_clear(): %d 0x%x 0x%x\n", p->p_pid, pcontrol, p->p_memstat_dirty);
-
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DIRTY_CLEAR), p->p_pid, pcontrol, 0, 0, 0);
-
- proc_list_lock();
-
- if ((p->p_listflag & P_LIST_EXITED) != 0) {
- /*
- * Process is on its way out.
- */
- ret = EBUSY;
- goto exit;
- }
-
- if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
- ret = EPERM;
- goto exit;
- }
-
- if (!(p->p_memstat_dirty & P_DIRTY_TRACK)) {
- /* Dirty tracking not enabled */
- ret = EINVAL;
- goto exit;
- }
-
- if (!pcontrol || (pcontrol & (PROC_DIRTY_LAUNCH_IN_PROGRESS | PROC_DIRTY_DEFER | PROC_DIRTY_DEFER_ALWAYS)) == 0) {
- ret = EINVAL;
- goto exit;
- }
-
- if (pcontrol & PROC_DIRTY_LAUNCH_IN_PROGRESS) {
- p->p_memstat_dirty &= ~P_DIRTY_LAUNCH_IN_PROGRESS;
- }
-
- /* This can be set and cleared exactly once. */
- if (pcontrol & (PROC_DIRTY_DEFER | PROC_DIRTY_DEFER_ALWAYS)) {
- if (p->p_memstat_dirty & P_DIRTY_DEFER) {
- p->p_memstat_dirty &= ~(P_DIRTY_DEFER);
- }
-
- if (p->p_memstat_dirty & P_DIRTY_DEFER_ALWAYS) {
- p->p_memstat_dirty &= ~(P_DIRTY_DEFER_ALWAYS);
- }
-
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
- memorystatus_update_idle_priority_locked(p);
- memorystatus_reschedule_idle_demotion_locked();
- }
-
- ret = 0;
-exit:
- proc_list_unlock();
-
- return ret;
-}
-
-int
-memorystatus_dirty_get(proc_t p)
-{
- int ret = 0;
-
- proc_list_lock();
-
- if (p->p_memstat_dirty & P_DIRTY_TRACK) {
- ret |= PROC_DIRTY_TRACKED;
- if (p->p_memstat_dirty & P_DIRTY_ALLOW_IDLE_EXIT) {
- ret |= PROC_DIRTY_ALLOWS_IDLE_EXIT;
- }
- if (p->p_memstat_dirty & P_DIRTY) {
- ret |= PROC_DIRTY_IS_DIRTY;
- }
- if (p->p_memstat_dirty & P_DIRTY_LAUNCH_IN_PROGRESS) {
- ret |= PROC_DIRTY_LAUNCH_IS_IN_PROGRESS;
- }
- }
-
- proc_list_unlock();
-
- return ret;
-}
-
-int
-memorystatus_on_terminate(proc_t p)
-{
- int sig;
-
- proc_list_lock();
-
- p->p_memstat_dirty |= P_DIRTY_TERMINATED;
-
- if ((p->p_memstat_dirty & (P_DIRTY_TRACK | P_DIRTY_IS_DIRTY)) == P_DIRTY_TRACK) {
- /* Clean; mark as terminated and issue SIGKILL */
- sig = SIGKILL;
- } else {
- /* Dirty, terminated, or state tracking is unsupported; issue SIGTERM to allow cleanup */
- sig = SIGTERM;
- }
-
- proc_list_unlock();
-
- return sig;
-}
-
-void
-memorystatus_on_suspend(proc_t p)
-{
-#if CONFIG_FREEZE
- uint32_t pages;
- memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL);
-#endif
- proc_list_lock();
-#if CONFIG_FREEZE
- memorystatus_suspended_count++;
-#endif
- p->p_memstat_state |= P_MEMSTAT_SUSPENDED;
- proc_list_unlock();
-}
-
-void
-memorystatus_on_resume(proc_t p)
-{
-#if CONFIG_FREEZE
- boolean_t frozen;
- pid_t pid;
-#endif
-
- proc_list_lock();
-
-#if CONFIG_FREEZE
- frozen = (p->p_memstat_state & P_MEMSTAT_FROZEN);
- if (frozen) {
- /*
- * Now that we don't _thaw_ a process completely,
- * resuming it (and having some on-demand swapins)
- * shouldn't preclude it from being counted as frozen.
- *
- * memorystatus_frozen_count--;
- *
- * We preserve the P_MEMSTAT_FROZEN state since the process
- * could have state on disk AND so will deserve some protection
- * in the jetsam bands.
- */
- if ((p->p_memstat_state & P_MEMSTAT_REFREEZE_ELIGIBLE) == 0) {
- p->p_memstat_state |= P_MEMSTAT_REFREEZE_ELIGIBLE;
- memorystatus_refreeze_eligible_count++;
- }
- p->p_memstat_thaw_count++;
-
- memorystatus_thaw_count++;
- }
-
- memorystatus_suspended_count--;
-
- pid = p->p_pid;
-#endif
-
- /*
- * P_MEMSTAT_FROZEN will remain unchanged. This used to be:
- * p->p_memstat_state &= ~(P_MEMSTAT_SUSPENDED | P_MEMSTAT_FROZEN);
- */
- p->p_memstat_state &= ~P_MEMSTAT_SUSPENDED;
-
- proc_list_unlock();
-
-#if CONFIG_FREEZE
- if (frozen) {
- memorystatus_freeze_entry_t data = { pid, FALSE, 0 };
- memorystatus_send_note(kMemorystatusFreezeNote, &data, sizeof(data));
- }
-#endif
-}
-
-void
-memorystatus_on_inactivity(proc_t p)
-{
-#pragma unused(p)
-#if CONFIG_FREEZE
- /* Wake the freeze thread */
- thread_wakeup((event_t)&memorystatus_freeze_wakeup);
-#endif
-}
-
-/*
- * The proc_list_lock is held by the caller.
- */
-static uint32_t
-memorystatus_build_state(proc_t p)
-{
- uint32_t snapshot_state = 0;
-
- /* General */
- if (p->p_memstat_state & P_MEMSTAT_SUSPENDED) {
- snapshot_state |= kMemorystatusSuspended;
- }
- if (p->p_memstat_state & P_MEMSTAT_FROZEN) {
- snapshot_state |= kMemorystatusFrozen;
- }
- if (p->p_memstat_state & P_MEMSTAT_REFREEZE_ELIGIBLE) {
- snapshot_state |= kMemorystatusWasThawed;
- }
-
- /* Tracking */
- if (p->p_memstat_dirty & P_DIRTY_TRACK) {
- snapshot_state |= kMemorystatusTracked;
- }
- if ((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) {
- snapshot_state |= kMemorystatusSupportsIdleExit;
- }
- if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
- snapshot_state |= kMemorystatusDirty;
- }
-
- return snapshot_state;
-}
-
-static boolean_t
-kill_idle_exit_proc(void)
-{
- proc_t p, victim_p = PROC_NULL;
- uint64_t current_time;
- boolean_t killed = FALSE;
- unsigned int i = 0;
- os_reason_t jetsam_reason = OS_REASON_NULL;
-
- /* Pick next idle exit victim. */
- current_time = mach_absolute_time();
-
- jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_IDLE_EXIT);
- if (jetsam_reason == OS_REASON_NULL) {
- printf("kill_idle_exit_proc: failed to allocate jetsam reason\n");
- }
-
- proc_list_lock();
-
- p = memorystatus_get_first_proc_locked(&i, FALSE);
- while (p) {
- /* No need to look beyond the idle band */
- if (p->p_memstat_effectivepriority != JETSAM_PRIORITY_IDLE) {
- break;
- }
-
- if ((p->p_memstat_dirty & (P_DIRTY_ALLOW_IDLE_EXIT | P_DIRTY_IS_DIRTY | P_DIRTY_TERMINATED)) == (P_DIRTY_ALLOW_IDLE_EXIT)) {
- if (current_time >= p->p_memstat_idledeadline) {
- p->p_memstat_dirty |= P_DIRTY_TERMINATED;
- victim_p = proc_ref_locked(p);
- break;
- }
- }
-
- p = memorystatus_get_next_proc_locked(&i, p, FALSE);
- }
-
- proc_list_unlock();
-
- if (victim_p) {
- printf("memorystatus: killing_idle_process pid %d [%s]\n", victim_p->p_pid, (*victim_p->p_name ? victim_p->p_name : "unknown"));
- killed = memorystatus_do_kill(victim_p, kMemorystatusKilledIdleExit, jetsam_reason);
- proc_rele(victim_p);
- } else {
- os_reason_free(jetsam_reason);
- }
-
- return killed;
-}
-
-static void
-memorystatus_thread_wake(void)
-{
- int thr_id = 0;
- int active_thr = atomic_load(&active_jetsam_threads);
-
- /* Wakeup all the jetsam threads */
- for (thr_id = 0; thr_id < active_thr; thr_id++) {
- thread_wakeup((event_t)&jetsam_threads[thr_id].memorystatus_wakeup);
- }
-}
-
-#if CONFIG_JETSAM
-
-static void
-memorystatus_thread_pool_max()
-{
- /* Increase the jetsam thread pool to max_jetsam_threads */
- int max_threads = max_jetsam_threads;
- printf("Expanding memorystatus pool to %d!\n", max_threads);
- atomic_store(&active_jetsam_threads, max_threads);
-}
-
-static void
-memorystatus_thread_pool_default()
-{
- /* Restore the jetsam thread pool to a single thread */
- printf("Reverting memorystatus pool back to 1\n");
- atomic_store(&active_jetsam_threads, 1);
-}
-
-#endif /* CONFIG_JETSAM */
-
-extern void vm_pressure_response(void);
-
-static int
-memorystatus_thread_block(uint32_t interval_ms, thread_continue_t continuation)
-{
- struct jetsam_thread_state *jetsam_thread = jetsam_current_thread();
-
- if (interval_ms) {
- assert_wait_timeout(&jetsam_thread->memorystatus_wakeup, THREAD_UNINT, interval_ms, NSEC_PER_MSEC);
- } else {
- assert_wait(&jetsam_thread->memorystatus_wakeup, THREAD_UNINT);
- }
-
- return thread_block(continuation);
-}
-
-static boolean_t
-memorystatus_avail_pages_below_pressure(void)
-{
-#if CONFIG_EMBEDDED
-/*
- * Instead of CONFIG_EMBEDDED for these *avail_pages* routines, we should
- * key off of the system having dynamic swap support. With full swap support,
- * the system shouldn't really need to worry about various page thresholds.
- */
- return memorystatus_available_pages <= memorystatus_available_pages_pressure;
-#else /* CONFIG_EMBEDDED */
- return FALSE;
-#endif /* CONFIG_EMBEDDED */
-}
-
-static boolean_t
-memorystatus_avail_pages_below_critical(void)
-{
-#if CONFIG_EMBEDDED
- return memorystatus_available_pages <= memorystatus_available_pages_critical;
-#else /* CONFIG_EMBEDDED */
- return FALSE;
-#endif /* CONFIG_EMBEDDED */
-}
-
-static boolean_t
-memorystatus_post_snapshot(int32_t priority, uint32_t cause)
-{
-#if CONFIG_EMBEDDED
-#pragma unused(cause)
- /*
- * Don't generate logs for steady-state idle-exit kills,
- * unless it is overridden for debug or by the device
- * tree.
- */
-
- return (priority != JETSAM_PRIORITY_IDLE) || memorystatus_idle_snapshot;
-
-#else /* CONFIG_EMBEDDED */
- /*
- * Don't generate logs for steady-state idle-exit kills,
- * unless
- * - it is overridden for debug or by the device
- * tree.
- * OR
- * - the kill causes are important i.e. not kMemorystatusKilledIdleExit
- */
-
- boolean_t snapshot_eligible_kill_cause = (is_reason_thrashing(cause) || is_reason_zone_map_exhaustion(cause));
- return (priority != JETSAM_PRIORITY_IDLE) || memorystatus_idle_snapshot || snapshot_eligible_kill_cause;
-#endif /* CONFIG_EMBEDDED */
-}
-
-static boolean_t
-memorystatus_action_needed(void)
-{
-#if CONFIG_EMBEDDED
- return is_reason_thrashing(kill_under_pressure_cause) ||
- is_reason_zone_map_exhaustion(kill_under_pressure_cause) ||
- memorystatus_available_pages <= memorystatus_available_pages_pressure;
-#else /* CONFIG_EMBEDDED */
- return is_reason_thrashing(kill_under_pressure_cause) ||
- is_reason_zone_map_exhaustion(kill_under_pressure_cause);
-#endif /* CONFIG_EMBEDDED */
-}
-
-#if CONFIG_FREEZE
-extern void vm_swap_consider_defragmenting(int);
-
-/*
- * This routine will _jetsam_ all frozen processes
- * and reclaim the swap space immediately.
- *
- * So freeze has to be DISABLED when we call this routine.
- */
-
-void
-memorystatus_disable_freeze(void)
-{
- memstat_bucket_t *bucket;
- int bucket_count = 0, retries = 0;
- boolean_t retval = FALSE, killed = FALSE;
- uint32_t errors = 0, errors_over_prev_iteration = 0;
- os_reason_t jetsam_reason = 0;
- unsigned int band = 0;
- proc_t p = PROC_NULL, next_p = PROC_NULL;
-
- assert(memorystatus_freeze_enabled == FALSE);
-
- jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_DISK_SPACE_SHORTAGE);
- if (jetsam_reason == OS_REASON_NULL) {
- printf("memorystatus_disable_freeze: failed to allocate jetsam reason\n");
- }
-
- /*
- * Let's relocate all frozen processes into band 8. Demoted frozen processes
- * are sitting in band 0 currently and it's possible to have a frozen process
- * in the FG band being actively used. We don't reset its frozen state when
- * it is resumed because it has state on disk.
- *
- * We choose to do this relocation rather than implement a new 'kill frozen'
- * process function for these reasons:
- * - duplication of code: too many kill functions exist and we need to rework them better.
- * - disk-space-shortage kills are rare
- * - not having the 'real' jetsam band at time of the this frozen kill won't preclude us
- * from answering any imp. questions re. jetsam policy/effectiveness.
- *
- * This is essentially what memorystatus_update_inactive_jetsam_priority_band() does while
- * avoiding the application of memory limits.
- */
-
-again:
- proc_list_lock();
-
- band = JETSAM_PRIORITY_IDLE;
- p = PROC_NULL;
- next_p = PROC_NULL;
-
- next_p = memorystatus_get_first_proc_locked(&band, TRUE);
- while (next_p) {
- p = next_p;
- next_p = memorystatus_get_next_proc_locked(&band, p, TRUE);
-
- if (p->p_memstat_effectivepriority > JETSAM_PRIORITY_FOREGROUND) {
- break;
- }
-
- if ((p->p_memstat_state & P_MEMSTAT_FROZEN) == FALSE) {
- continue;
- }
-
- if (p->p_memstat_state & P_MEMSTAT_ERROR) {
- p->p_memstat_state &= ~P_MEMSTAT_ERROR;
- }
-
- if (p->p_memstat_effectivepriority == memorystatus_freeze_jetsam_band) {
- continue;
- }
-
- /*
- * We explicitly add this flag here so the process looks like a normal
- * frozen process i.e. P_MEMSTAT_FROZEN and P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND.
- * We don't bother with assigning the 'active' memory
- * limits at this point because we are going to be killing it soon below.
- */
- p->p_memstat_state |= P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND;
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
-
- memorystatus_update_priority_locked(p, memorystatus_freeze_jetsam_band, FALSE, TRUE);
- }
-
- bucket = &memstat_bucket[memorystatus_freeze_jetsam_band];
- bucket_count = bucket->count;
- proc_list_unlock();
-
- /*
- * Bucket count is already stale at this point. But, we don't expect
- * freezing to continue since we have already disabled the freeze functionality.
- * However, an existing freeze might be in progress. So we might miss that process
- * in the first go-around. We hope to catch it in the next.
- */
-
- errors_over_prev_iteration = 0;
- while (bucket_count) {
- bucket_count--;
-
- /*
- * memorystatus_kill_elevated_process() drops a reference,
- * so take another one so we can continue to use this exit reason
- * even after it returns.
- */
-
- os_reason_ref(jetsam_reason);
- retval = memorystatus_kill_elevated_process(
- kMemorystatusKilledDiskSpaceShortage,
- jetsam_reason,
- memorystatus_freeze_jetsam_band,
- 0, /* the iteration of aggressive jetsam..ignored here */
- &errors);
-
- if (errors > 0) {
- printf("memorystatus_disable_freeze: memorystatus_kill_elevated_process returned %d error(s)\n", errors);
- errors_over_prev_iteration += errors;
- errors = 0;
- }
-
- if (retval == 0) {
- /*
- * No frozen processes left to kill.
- */
- break;
- }
-
- killed = TRUE;
- }
-
- proc_list_lock();
-
- if (memorystatus_frozen_count) {
- /*
- * A frozen process snuck in and so
- * go back around to kill it. That
- * process may have been resumed and
- * put into the FG band too. So we
- * have to do the relocation again.
- */
- assert(memorystatus_freeze_enabled == FALSE);
-
- retries++;
- if (retries < 3) {
- proc_list_unlock();
- goto again;
- }
-#if DEVELOPMENT || DEBUG
- panic("memorystatus_disable_freeze: Failed to kill all frozen processes, memorystatus_frozen_count = %d, errors = %d",
- memorystatus_frozen_count, errors_over_prev_iteration);
-#endif /* DEVELOPMENT || DEBUG */
- }
- proc_list_unlock();
-
- os_reason_free(jetsam_reason);
-
- if (killed) {
- vm_swap_consider_defragmenting(VM_SWAP_FLAGS_FORCE_DEFRAG | VM_SWAP_FLAGS_FORCE_RECLAIM);
-
- proc_list_lock();
- size_t snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) +
- sizeof(memorystatus_jetsam_snapshot_entry_t) * (memorystatus_jetsam_snapshot_count);
- uint64_t timestamp_now = mach_absolute_time();
- memorystatus_jetsam_snapshot->notification_time = timestamp_now;
- memorystatus_jetsam_snapshot->js_gencount++;
- if (memorystatus_jetsam_snapshot_count > 0 && (memorystatus_jetsam_snapshot_last_timestamp == 0 ||
- timestamp_now > memorystatus_jetsam_snapshot_last_timestamp + memorystatus_jetsam_snapshot_timeout)) {
- proc_list_unlock();
- int ret = memorystatus_send_note(kMemorystatusSnapshotNote, &snapshot_size, sizeof(snapshot_size));
- if (!ret) {
- proc_list_lock();
- memorystatus_jetsam_snapshot_last_timestamp = timestamp_now;
- proc_list_unlock();
- }
- } else {
- proc_list_unlock();
- }
- }
-
- return;
-}
-#endif /* CONFIG_FREEZE */
-
-static boolean_t
-memorystatus_act_on_hiwat_processes(uint32_t *errors, uint32_t *hwm_kill, boolean_t *post_snapshot, __unused boolean_t *is_critical)
-{
- boolean_t purged = FALSE;
- boolean_t killed = memorystatus_kill_hiwat_proc(errors, &purged);
-
- if (killed) {
- *hwm_kill = *hwm_kill + 1;
- *post_snapshot = TRUE;
- return TRUE;
- } else {
- if (purged == FALSE) {
- /* couldn't purge and couldn't kill */
- memorystatus_hwm_candidates = FALSE;
- }
- }
-
-#if CONFIG_JETSAM
- /* No highwater processes to kill. Continue or stop for now? */
- if (!is_reason_thrashing(kill_under_pressure_cause) &&
- !is_reason_zone_map_exhaustion(kill_under_pressure_cause) &&
- (memorystatus_available_pages > memorystatus_available_pages_critical)) {
- /*
- * We are _not_ out of pressure but we are above the critical threshold and there's:
- * - no compressor thrashing
- * - enough zone memory
- * - no more HWM processes left.
- * For now, don't kill any other processes.
- */
-
- if (*hwm_kill == 0) {
- memorystatus_thread_wasted_wakeup++;
- }
-
- *is_critical = FALSE;
-
- return TRUE;
- }
-#endif /* CONFIG_JETSAM */
-
- return FALSE;
-}
-
-static boolean_t
-memorystatus_act_aggressive(uint32_t cause, os_reason_t jetsam_reason, int *jld_idle_kills, boolean_t *corpse_list_purged, boolean_t *post_snapshot)
-{
- if (memorystatus_jld_enabled == TRUE) {
- boolean_t killed;
- uint32_t errors = 0;
-
- /* Jetsam Loop Detection - locals */
- memstat_bucket_t *bucket;
- int jld_bucket_count = 0;
- struct timeval jld_now_tstamp = {0, 0};
- uint64_t jld_now_msecs = 0;
- int elevated_bucket_count = 0;
-
- /* Jetsam Loop Detection - statics */
- static uint64_t jld_timestamp_msecs = 0;
- static int jld_idle_kill_candidates = 0; /* Number of available processes in band 0,1 at start */
- static int jld_eval_aggressive_count = 0; /* Bumps the max priority in aggressive loop */
- static int32_t jld_priority_band_max = JETSAM_PRIORITY_UI_SUPPORT;
- /*
- * Jetsam Loop Detection: attempt to detect
- * rapid daemon relaunches in the lower bands.
- */
-
- microuptime(&jld_now_tstamp);
-
- /*
- * Ignore usecs in this calculation.
- * msecs granularity is close enough.
- */
- jld_now_msecs = (jld_now_tstamp.tv_sec * 1000);
-
- proc_list_lock();
- switch (jetsam_aging_policy) {
- case kJetsamAgingPolicyLegacy:
- bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE];
- jld_bucket_count = bucket->count;
- bucket = &memstat_bucket[JETSAM_PRIORITY_AGING_BAND1];
- jld_bucket_count += bucket->count;
- break;
- case kJetsamAgingPolicySysProcsReclaimedFirst:
- case kJetsamAgingPolicyAppsReclaimedFirst:
- bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE];
- jld_bucket_count = bucket->count;
- bucket = &memstat_bucket[system_procs_aging_band];
- jld_bucket_count += bucket->count;
- bucket = &memstat_bucket[applications_aging_band];
- jld_bucket_count += bucket->count;
- break;
- case kJetsamAgingPolicyNone:
- default:
- bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE];
- jld_bucket_count = bucket->count;
- break;
- }
-
- bucket = &memstat_bucket[JETSAM_PRIORITY_ELEVATED_INACTIVE];
- elevated_bucket_count = bucket->count;
-
- proc_list_unlock();
-
- /*
- * memorystatus_jld_eval_period_msecs is a tunable
- * memorystatus_jld_eval_aggressive_count is a tunable
- * memorystatus_jld_eval_aggressive_priority_band_max is a tunable
- */
- if ((jld_bucket_count == 0) ||
- (jld_now_msecs > (jld_timestamp_msecs + memorystatus_jld_eval_period_msecs))) {
- /*
- * Refresh evaluation parameters
- */
- jld_timestamp_msecs = jld_now_msecs;
- jld_idle_kill_candidates = jld_bucket_count;
- *jld_idle_kills = 0;
- jld_eval_aggressive_count = 0;
- jld_priority_band_max = JETSAM_PRIORITY_UI_SUPPORT;
- }
-
- if (*jld_idle_kills > jld_idle_kill_candidates) {
- jld_eval_aggressive_count++;
-
-#if DEVELOPMENT || DEBUG
- printf("memorystatus: aggressive%d: beginning of window: %lld ms, : timestamp now: %lld ms\n",
- jld_eval_aggressive_count,
- jld_timestamp_msecs,
- jld_now_msecs);
- printf("memorystatus: aggressive%d: idle candidates: %d, idle kills: %d\n",
- jld_eval_aggressive_count,
- jld_idle_kill_candidates,
- *jld_idle_kills);
-#endif /* DEVELOPMENT || DEBUG */
-
- if ((jld_eval_aggressive_count == memorystatus_jld_eval_aggressive_count) &&
- (total_corpses_count() > 0) && (*corpse_list_purged == FALSE)) {
- /*
- * If we reach this aggressive cycle, corpses might be causing memory pressure.
- * So, in an effort to avoid jetsams in the FG band, we will attempt to purge
- * corpse memory prior to this final march through JETSAM_PRIORITY_UI_SUPPORT.
- */
- task_purge_all_corpses();
- *corpse_list_purged = TRUE;
- } else if (jld_eval_aggressive_count > memorystatus_jld_eval_aggressive_count) {
- /*
- * Bump up the jetsam priority limit (eg: the bucket index)
- * Enforce bucket index sanity.
- */
- if ((memorystatus_jld_eval_aggressive_priority_band_max < 0) ||
- (memorystatus_jld_eval_aggressive_priority_band_max >= MEMSTAT_BUCKET_COUNT)) {
- /*
- * Do nothing. Stick with the default level.
- */
- } else {
- jld_priority_band_max = memorystatus_jld_eval_aggressive_priority_band_max;
- }
- }
-
- /* Visit elevated processes first */
- while (elevated_bucket_count) {
- elevated_bucket_count--;
-
- /*
- * memorystatus_kill_elevated_process() drops a reference,
- * so take another one so we can continue to use this exit reason
- * even after it returns.
- */
-
- os_reason_ref(jetsam_reason);
- killed = memorystatus_kill_elevated_process(
- cause,
- jetsam_reason,
- JETSAM_PRIORITY_ELEVATED_INACTIVE,
- jld_eval_aggressive_count,
- &errors);
-
- if (killed) {
- *post_snapshot = TRUE;
- if (memorystatus_avail_pages_below_pressure()) {
- /*
- * Still under pressure.
- * Find another pinned processes.
- */
- continue;
- } else {
- return TRUE;
- }
- } else {
- /*
- * No pinned processes left to kill.
- * Abandon elevated band.
- */
- break;
- }
- }
-
- /*
- * memorystatus_kill_top_process_aggressive() allocates its own
- * jetsam_reason so the kMemorystatusKilledProcThrashing cause
- * is consistent throughout the aggressive march.
- */
- killed = memorystatus_kill_top_process_aggressive(
- kMemorystatusKilledProcThrashing,
- jld_eval_aggressive_count,
- jld_priority_band_max,
- &errors);
-
- if (killed) {
- /* Always generate logs after aggressive kill */
- *post_snapshot = TRUE;
- *jld_idle_kills = 0;
- return TRUE;
- }
- }
-
- return FALSE;
- }
-
- return FALSE;
-}
-
-
-static void
-memorystatus_thread(void *param __unused, wait_result_t wr __unused)
-{
- boolean_t post_snapshot = FALSE;
- uint32_t errors = 0;
- uint32_t hwm_kill = 0;
- boolean_t sort_flag = TRUE;
- boolean_t corpse_list_purged = FALSE;
- int jld_idle_kills = 0;
- struct jetsam_thread_state *jetsam_thread = jetsam_current_thread();
-
- if (jetsam_thread->inited == FALSE) {
- /*
- * It's the first time the thread has run, so just mark the thread as privileged and block.
- * This avoids a spurious pass with unset variables, as set out in <rdar://problem/9609402>.
- */
-
- char name[32];
- thread_wire(host_priv_self(), current_thread(), TRUE);
- snprintf(name, 32, "VM_memorystatus_%d", jetsam_thread->index + 1);
-
- if (jetsam_thread->index == 0) {
- if (vm_pageout_state.vm_restricted_to_single_processor == TRUE) {
- thread_vm_bind_group_add();
- }
- }
- thread_set_thread_name(current_thread(), name);
- jetsam_thread->inited = TRUE;
- memorystatus_thread_block(0, memorystatus_thread);
- }
-
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_SCAN) | DBG_FUNC_START,
- memorystatus_available_pages, memorystatus_jld_enabled, memorystatus_jld_eval_period_msecs, memorystatus_jld_eval_aggressive_count, 0);
-
- /*
- * Jetsam aware version.
- *
- * The VM pressure notification thread is working it's way through clients in parallel.
- *
- * So, while the pressure notification thread is targeting processes in order of
- * increasing jetsam priority, we can hopefully reduce / stop it's work by killing
- * any processes that have exceeded their highwater mark.
- *
- * If we run out of HWM processes and our available pages drops below the critical threshold, then,
- * we target the least recently used process in order of increasing jetsam priority (exception: the FG band).
- */
- while (memorystatus_action_needed()) {
- boolean_t killed;
- int32_t priority;
- uint32_t cause;
- uint64_t jetsam_reason_code = JETSAM_REASON_INVALID;
- os_reason_t jetsam_reason = OS_REASON_NULL;
-
- cause = kill_under_pressure_cause;
- switch (cause) {
- case kMemorystatusKilledFCThrashing:
- jetsam_reason_code = JETSAM_REASON_MEMORY_FCTHRASHING;
- break;
- case kMemorystatusKilledVMCompressorThrashing:
- jetsam_reason_code = JETSAM_REASON_MEMORY_VMCOMPRESSOR_THRASHING;
- break;
- case kMemorystatusKilledVMCompressorSpaceShortage:
- jetsam_reason_code = JETSAM_REASON_MEMORY_VMCOMPRESSOR_SPACE_SHORTAGE;
- break;
- case kMemorystatusKilledZoneMapExhaustion:
- jetsam_reason_code = JETSAM_REASON_ZONE_MAP_EXHAUSTION;
- break;
- case kMemorystatusKilledVMPageShortage:
- /* falls through */
- default:
- jetsam_reason_code = JETSAM_REASON_MEMORY_VMPAGESHORTAGE;
- cause = kMemorystatusKilledVMPageShortage;
- break;
- }
-
- /* Highwater */
- boolean_t is_critical = TRUE;
- if (memorystatus_act_on_hiwat_processes(&errors, &hwm_kill, &post_snapshot, &is_critical)) {
- if (is_critical == FALSE) {
- /*
- * For now, don't kill any other processes.
- */
- break;
- } else {
- goto done;
- }
- }
-
- jetsam_reason = os_reason_create(OS_REASON_JETSAM, jetsam_reason_code);
- if (jetsam_reason == OS_REASON_NULL) {
- printf("memorystatus_thread: failed to allocate jetsam reason\n");
- }
-
- if (memorystatus_act_aggressive(cause, jetsam_reason, &jld_idle_kills, &corpse_list_purged, &post_snapshot)) {
- goto done;
- }
-
- /*
- * memorystatus_kill_top_process() drops a reference,
- * so take another one so we can continue to use this exit reason
- * even after it returns
- */
- os_reason_ref(jetsam_reason);
-
- /* LRU */
- killed = memorystatus_kill_top_process(TRUE, sort_flag, cause, jetsam_reason, &priority, &errors);
- sort_flag = FALSE;
-
- if (killed) {
- if (memorystatus_post_snapshot(priority, cause) == TRUE) {
- post_snapshot = TRUE;
- }
-
- /* Jetsam Loop Detection */
- if (memorystatus_jld_enabled == TRUE) {
- if ((priority == JETSAM_PRIORITY_IDLE) || (priority == system_procs_aging_band) || (priority == applications_aging_band)) {
- jld_idle_kills++;
- } else {
- /*
- * We've reached into bands beyond idle deferred.
- * We make no attempt to monitor them
- */
- }
- }
-
- if ((priority >= JETSAM_PRIORITY_UI_SUPPORT) && (total_corpses_count() > 0) && (corpse_list_purged == FALSE)) {
- /*
- * If we have jetsammed a process in or above JETSAM_PRIORITY_UI_SUPPORT
- * then we attempt to relieve pressure by purging corpse memory.
- */
- task_purge_all_corpses();
- corpse_list_purged = TRUE;
- }
- goto done;
- }
-
- if (memorystatus_avail_pages_below_critical()) {
- /*
- * Still under pressure and unable to kill a process - purge corpse memory
- */
- if (total_corpses_count() > 0) {
- task_purge_all_corpses();
- corpse_list_purged = TRUE;
- }
-
- if (memorystatus_avail_pages_below_critical()) {
- /*
- * Still under pressure and unable to kill a process - panic
- */
- panic("memorystatus_jetsam_thread: no victim! available pages:%llu\n", (uint64_t)memorystatus_available_pages);
- }
- }
-
-done:
-
- /*
- * We do not want to over-kill when thrashing has been detected.
- * To avoid that, we reset the flag here and notify the
- * compressor.
- */
- if (is_reason_thrashing(kill_under_pressure_cause)) {
- kill_under_pressure_cause = 0;
-#if CONFIG_JETSAM
- vm_thrashing_jetsam_done();
-#endif /* CONFIG_JETSAM */
- } else if (is_reason_zone_map_exhaustion(kill_under_pressure_cause)) {
- kill_under_pressure_cause = 0;
- }
-
- os_reason_free(jetsam_reason);
- }
-
- kill_under_pressure_cause = 0;
-
- if (errors) {
- memorystatus_clear_errors();
- }
-
- if (post_snapshot) {
- proc_list_lock();
- size_t snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) +
- sizeof(memorystatus_jetsam_snapshot_entry_t) * (memorystatus_jetsam_snapshot_count);
- uint64_t timestamp_now = mach_absolute_time();
- memorystatus_jetsam_snapshot->notification_time = timestamp_now;
- memorystatus_jetsam_snapshot->js_gencount++;
- if (memorystatus_jetsam_snapshot_count > 0 && (memorystatus_jetsam_snapshot_last_timestamp == 0 ||
- timestamp_now > memorystatus_jetsam_snapshot_last_timestamp + memorystatus_jetsam_snapshot_timeout)) {
- proc_list_unlock();
- int ret = memorystatus_send_note(kMemorystatusSnapshotNote, &snapshot_size, sizeof(snapshot_size));
- if (!ret) {
- proc_list_lock();
- memorystatus_jetsam_snapshot_last_timestamp = timestamp_now;
- proc_list_unlock();
- }
- } else {
- proc_list_unlock();
- }
- }
-
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_SCAN) | DBG_FUNC_END,
- memorystatus_available_pages, 0, 0, 0, 0);
-
- memorystatus_thread_block(0, memorystatus_thread);
-}
-
-/*
- * Returns TRUE:
- * when an idle-exitable proc was killed
- * Returns FALSE:
- * when there are no more idle-exitable procs found
- * when the attempt to kill an idle-exitable proc failed
- */
-boolean_t
-memorystatus_idle_exit_from_VM(void)
-{
- /*
- * This routine should no longer be needed since we are
- * now using jetsam bands on all platforms and so will deal
- * with IDLE processes within the memorystatus thread itself.
- *
- * But we still use it because we observed that macos systems
- * started heavy compression/swapping with a bunch of
- * idle-exitable processes alive and doing nothing. We decided
- * to rather kill those processes than start swapping earlier.
- */
-
- return kill_idle_exit_proc();
-}
-
-/*
- * Callback invoked when allowable physical memory footprint exceeded
- * (dirty pages + IOKit mappings)
- *
- * This is invoked for both advisory, non-fatal per-task high watermarks,
- * as well as the fatal task memory limits.
- */
-void
-memorystatus_on_ledger_footprint_exceeded(boolean_t warning, boolean_t memlimit_is_active, boolean_t memlimit_is_fatal)
-{
- os_reason_t jetsam_reason = OS_REASON_NULL;
-
- proc_t p = current_proc();
-
-#if VM_PRESSURE_EVENTS
- if (warning == TRUE) {
- /*
- * This is a warning path which implies that the current process is close, but has
- * not yet exceeded its per-process memory limit.
- */
- if (memorystatus_warn_process(p->p_pid, memlimit_is_active, memlimit_is_fatal, FALSE /* not exceeded */) != TRUE) {
- /* Print warning, since it's possible that task has not registered for pressure notifications */
- os_log(OS_LOG_DEFAULT, "memorystatus_on_ledger_footprint_exceeded: failed to warn the current task (%d exiting, or no handler registered?).\n", p->p_pid);
- }
- return;
- }
-#endif /* VM_PRESSURE_EVENTS */
-
- if (memlimit_is_fatal) {
- /*
- * If this process has no high watermark or has a fatal task limit, then we have been invoked because the task
- * has violated either the system-wide per-task memory limit OR its own task limit.
- */
- jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_PERPROCESSLIMIT);
- if (jetsam_reason == NULL) {
- printf("task_exceeded footprint: failed to allocate jetsam reason\n");
- } else if (corpse_for_fatal_memkill != 0 && proc_send_synchronous_EXC_RESOURCE(p) == FALSE) {
- /* Set OS_REASON_FLAG_GENERATE_CRASH_REPORT to generate corpse */
- jetsam_reason->osr_flags |= OS_REASON_FLAG_GENERATE_CRASH_REPORT;
- }
-
- if (memorystatus_kill_process_sync(p->p_pid, kMemorystatusKilledPerProcessLimit, jetsam_reason) != TRUE) {
- printf("task_exceeded_footprint: failed to kill the current task (exiting?).\n");
- }
- } else {
- /*
- * HWM offender exists. Done without locks or synchronization.
- * See comment near its declaration for more details.
- */
- memorystatus_hwm_candidates = TRUE;
-
-#if VM_PRESSURE_EVENTS
- /*
- * The current process is not in the warning path.
- * This path implies the current process has exceeded a non-fatal (soft) memory limit.
- * Failure to send note is ignored here.
- */
- (void)memorystatus_warn_process(p->p_pid, memlimit_is_active, memlimit_is_fatal, TRUE /* exceeded */);
-
-#endif /* VM_PRESSURE_EVENTS */
- }
-}
-
-void
-memorystatus_log_exception(const int max_footprint_mb, boolean_t memlimit_is_active, boolean_t memlimit_is_fatal)
-{
- proc_t p = current_proc();
-
- /*
- * The limit violation is logged here, but only once per process per limit.
- * Soft memory limit is a non-fatal high-water-mark
- * Hard memory limit is a fatal custom-task-limit or system-wide per-task memory limit.
- */
-
- os_log_with_startup_serial(OS_LOG_DEFAULT, "EXC_RESOURCE -> %s[%d] exceeded mem limit: %s%s %d MB (%s)\n",
- (*p->p_name ? p->p_name : "unknown"), p->p_pid, (memlimit_is_active ? "Active" : "Inactive"),
- (memlimit_is_fatal ? "Hard" : "Soft"), max_footprint_mb,
- (memlimit_is_fatal ? "fatal" : "non-fatal"));
-
- return;
-}
-
-
-/*
- * Description:
- * Evaluates process state to determine which limit
- * should be applied (active vs. inactive limit).
- *
- * Processes that have the 'elevated inactive jetsam band' attribute
- * are first evaluated based on their current priority band.
- * presently elevated ==> active
- *
- * Processes that opt into dirty tracking are evaluated
- * based on clean vs dirty state.
- * dirty ==> active
- * clean ==> inactive
- *
- * Process that do not opt into dirty tracking are
- * evalulated based on priority level.
- * Foreground or above ==> active
- * Below Foreground ==> inactive
- *
- * Return: TRUE if active
- * False if inactive
- */
-
-static boolean_t
-proc_jetsam_state_is_active_locked(proc_t p)
-{
- if ((p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) &&
- (p->p_memstat_effectivepriority == JETSAM_PRIORITY_ELEVATED_INACTIVE)) {
- /*
- * process has the 'elevated inactive jetsam band' attribute
- * and process is present in the elevated band
- * implies active state
- */
- return TRUE;
- } else if (p->p_memstat_dirty & P_DIRTY_TRACK) {
- /*
- * process has opted into dirty tracking
- * active state is based on dirty vs. clean
- */
- if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
- /*
- * process is dirty
- * implies active state
- */
- return TRUE;
- } else {
- /*
- * process is clean
- * implies inactive state
- */
- return FALSE;
- }
- } else if (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND) {
- /*
- * process is Foreground or higher
- * implies active state
- */
- return TRUE;
- } else {
- /*
- * process found below Foreground
- * implies inactive state
- */
- return FALSE;
- }
-}
-
-static boolean_t
-memorystatus_kill_process_sync(pid_t victim_pid, uint32_t cause, os_reason_t jetsam_reason)
-{
- boolean_t res;
-
- uint32_t errors = 0;
-
- if (victim_pid == -1) {
- /* No pid, so kill first process */
- res = memorystatus_kill_top_process(TRUE, TRUE, cause, jetsam_reason, NULL, &errors);
- } else {
- res = memorystatus_kill_specific_process(victim_pid, cause, jetsam_reason);
- }
-
- if (errors) {
- memorystatus_clear_errors();
- }
-
- if (res == TRUE) {
- /* Fire off snapshot notification */
- proc_list_lock();
- size_t snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) +
- sizeof(memorystatus_jetsam_snapshot_entry_t) * memorystatus_jetsam_snapshot_count;
- uint64_t timestamp_now = mach_absolute_time();
- memorystatus_jetsam_snapshot->notification_time = timestamp_now;
- if (memorystatus_jetsam_snapshot_count > 0 && (memorystatus_jetsam_snapshot_last_timestamp == 0 ||
- timestamp_now > memorystatus_jetsam_snapshot_last_timestamp + memorystatus_jetsam_snapshot_timeout)) {
- proc_list_unlock();
- int ret = memorystatus_send_note(kMemorystatusSnapshotNote, &snapshot_size, sizeof(snapshot_size));
- if (!ret) {
- proc_list_lock();
- memorystatus_jetsam_snapshot_last_timestamp = timestamp_now;
- proc_list_unlock();
- }
- } else {
- proc_list_unlock();
- }
- }
-
- return res;
-}
-
-/*
- * Jetsam a specific process.
- */
-static boolean_t
-memorystatus_kill_specific_process(pid_t victim_pid, uint32_t cause, os_reason_t jetsam_reason)
-{
- boolean_t killed;
- proc_t p;
- uint64_t killtime = 0;
- clock_sec_t tv_sec;
- clock_usec_t tv_usec;
- uint32_t tv_msec;
-
- /* TODO - add a victim queue and push this into the main jetsam thread */
-
- p = proc_find(victim_pid);
- if (!p) {
- os_reason_free(jetsam_reason);
- return FALSE;
- }
-
- proc_list_lock();
-
- if (memorystatus_jetsam_snapshot_count == 0) {
- memorystatus_init_jetsam_snapshot_locked(NULL, 0);
- }
-
- killtime = mach_absolute_time();
- absolutetime_to_microtime(killtime, &tv_sec, &tv_usec);
- tv_msec = tv_usec / 1000;
-
- memorystatus_update_jetsam_snapshot_entry_locked(p, cause, killtime);
-
- proc_list_unlock();
-
- os_log_with_startup_serial(OS_LOG_DEFAULT, "%lu.%03d memorystatus: killing_specific_process pid %d [%s] (%s %d) - memorystatus_available_pages: %llu\n",
- (unsigned long)tv_sec, tv_msec, victim_pid, (*p->p_name ? p->p_name : "unknown"),
- memorystatus_kill_cause_name[cause], p->p_memstat_effectivepriority, (uint64_t)memorystatus_available_pages);
-
- killed = memorystatus_do_kill(p, cause, jetsam_reason);
- proc_rele(p);
-
- return killed;
-}
-
-
-/*
- * Toggle the P_MEMSTAT_TERMINATED state.
- * Takes the proc_list_lock.
- */
-void
-proc_memstat_terminated(proc_t p, boolean_t set)
-{
-#if DEVELOPMENT || DEBUG
- if (p) {
- proc_list_lock();
- if (set == TRUE) {
- p->p_memstat_state |= P_MEMSTAT_TERMINATED;
- } else {
- p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
- }
- proc_list_unlock();
- }
-#else
-#pragma unused(p, set)
- /*
- * do nothing
- */
-#endif /* DEVELOPMENT || DEBUG */
- return;
-}
-
-
-#if CONFIG_JETSAM
-/*
- * This is invoked when cpulimits have been exceeded while in fatal mode.
- * The jetsam_flags do not apply as those are for memory related kills.
- * We call this routine so that the offending process is killed with
- * a non-zero exit status.
- */
-void
-jetsam_on_ledger_cpulimit_exceeded(void)
-{
- int retval = 0;
- int jetsam_flags = 0; /* make it obvious */
- proc_t p = current_proc();
- os_reason_t jetsam_reason = OS_REASON_NULL;
-
- printf("task_exceeded_cpulimit: killing pid %d [%s]\n",
- p->p_pid, (*p->p_name ? p->p_name : "(unknown)"));
-
- jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_CPULIMIT);
- if (jetsam_reason == OS_REASON_NULL) {
- printf("task_exceeded_cpulimit: unable to allocate memory for jetsam reason\n");
- }
-
- retval = jetsam_do_kill(p, jetsam_flags, jetsam_reason);
-
- if (retval) {
- printf("task_exceeded_cpulimit: failed to kill current task (exiting?).\n");
- }
-}
-
-#endif /* CONFIG_JETSAM */
-
-static void
-memorystatus_get_task_memory_region_count(task_t task, uint64_t *count)
-{
- assert(task);
- assert(count);
-
- *count = get_task_memory_region_count(task);
-}
-
-
-#define MEMORYSTATUS_VM_MAP_FORK_ALLOWED 0x100000000
-#define MEMORYSTATUS_VM_MAP_FORK_NOT_ALLOWED 0x200000000
-
-#if DEVELOPMENT || DEBUG
-
-/*
- * Sysctl only used to test memorystatus_allowed_vm_map_fork() path.
- * set a new pidwatch value
- * or
- * get the current pidwatch value
- *
- * The pidwatch_val starts out with a PID to watch for in the map_fork path.
- * Its value is:
- * - OR'd with MEMORYSTATUS_VM_MAP_FORK_ALLOWED if we allow the map_fork.
- * - OR'd with MEMORYSTATUS_VM_MAP_FORK_NOT_ALLOWED if we disallow the map_fork.
- * - set to -1ull if the map_fork() is aborted for other reasons.
- */
-
-uint64_t memorystatus_vm_map_fork_pidwatch_val = 0;
-
-static int sysctl_memorystatus_vm_map_fork_pidwatch SYSCTL_HANDLER_ARGS {
-#pragma unused(oidp, arg1, arg2)
-
- uint64_t new_value = 0;
- uint64_t old_value = 0;
- int error = 0;
-
- /*
- * The pid is held in the low 32 bits.
- * The 'allowed' flags are in the upper 32 bits.
- */
- old_value = memorystatus_vm_map_fork_pidwatch_val;
-
- error = sysctl_io_number(req, old_value, sizeof(old_value), &new_value, NULL);
-
- if (error || !req->newptr) {
- /*
- * No new value passed in.
- */
- return error;
- }
-
- /*
- * A new pid was passed in via req->newptr.
- * Ignore any attempt to set the higher order bits.
- */
- memorystatus_vm_map_fork_pidwatch_val = new_value & 0xFFFFFFFF;
- printf("memorystatus: pidwatch old_value = 0x%llx, new_value = 0x%llx \n", old_value, new_value);
-
- return error;
-}
-
-SYSCTL_PROC(_kern, OID_AUTO, memorystatus_vm_map_fork_pidwatch, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_MASKED,
- 0, 0, sysctl_memorystatus_vm_map_fork_pidwatch, "Q", "get/set pid watched for in vm_map_fork");
-
-
-/*
- * Record if a watched process fails to qualify for a vm_map_fork().
- */
-void
-memorystatus_abort_vm_map_fork(task_t task)
-{
- if (memorystatus_vm_map_fork_pidwatch_val != 0) {
- proc_t p = get_bsdtask_info(task);
- if (p != NULL && memorystatus_vm_map_fork_pidwatch_val == (uint64_t)p->p_pid) {
- memorystatus_vm_map_fork_pidwatch_val = -1ull;
- }
- }
-}
-
-static void
-set_vm_map_fork_pidwatch(task_t task, uint64_t x)
-{
- if (memorystatus_vm_map_fork_pidwatch_val != 0) {
- proc_t p = get_bsdtask_info(task);
- if (p && (memorystatus_vm_map_fork_pidwatch_val == (uint64_t)p->p_pid)) {
- memorystatus_vm_map_fork_pidwatch_val |= x;
- }
- }
-}
-
-#else /* DEVELOPMENT || DEBUG */
-
-
-static void
-set_vm_map_fork_pidwatch(task_t task, uint64_t x)
-{
-#pragma unused(task)
-#pragma unused(x)
-}
-
-#endif /* DEVELOPMENT || DEBUG */
-
-/*
- * Called during EXC_RESOURCE handling when a process exceeds a soft
- * memory limit. This is the corpse fork path and here we decide if
- * vm_map_fork will be allowed when creating the corpse.
- * The task being considered is suspended.
- *
- * By default, a vm_map_fork is allowed to proceed.
- *
- * A few simple policy assumptions:
- * Desktop platform is not considered in this path.
- * The vm_map_fork is always allowed.
- *
- * If the device has a zero system-wide task limit,
- * then the vm_map_fork is allowed.
- *
- * And if a process's memory footprint calculates less
- * than or equal to half of the system-wide task limit,
- * then the vm_map_fork is allowed. This calculation
- * is based on the assumption that a process can
- * munch memory up to the system-wide task limit.
- */
-boolean_t
-memorystatus_allowed_vm_map_fork(task_t task)
-{
- boolean_t is_allowed = TRUE; /* default */
-
-#if CONFIG_EMBEDDED
-
- uint64_t footprint_in_bytes;
- uint64_t max_allowed_bytes;
-
- if (max_task_footprint_mb == 0) {
- set_vm_map_fork_pidwatch(task, MEMORYSTATUS_VM_MAP_FORK_ALLOWED);
- return is_allowed;
- }
-
- footprint_in_bytes = get_task_phys_footprint(task);
-
- /*
- * Maximum is 1/4 of the system-wide task limit.
- */
- max_allowed_bytes = ((uint64_t)max_task_footprint_mb * 1024 * 1024) >> 2;
-
- if (footprint_in_bytes > max_allowed_bytes) {
- printf("memorystatus disallowed vm_map_fork %lld %lld\n", footprint_in_bytes, max_allowed_bytes);
- set_vm_map_fork_pidwatch(task, MEMORYSTATUS_VM_MAP_FORK_NOT_ALLOWED);
- return !is_allowed;
- }
-#endif /* CONFIG_EMBEDDED */
-
- set_vm_map_fork_pidwatch(task, MEMORYSTATUS_VM_MAP_FORK_ALLOWED);
- return is_allowed;
-}
-
-static void
-memorystatus_get_task_page_counts(task_t task, uint32_t *footprint, uint32_t *max_footprint_lifetime, uint32_t *purgeable_pages)
-{
- assert(task);
- assert(footprint);
-
- uint64_t pages;
-
- pages = (get_task_phys_footprint(task) / PAGE_SIZE_64);
- assert(((uint32_t)pages) == pages);
- *footprint = (uint32_t)pages;
-
- if (max_footprint_lifetime) {
- pages = (get_task_phys_footprint_lifetime_max(task) / PAGE_SIZE_64);
- assert(((uint32_t)pages) == pages);
- *max_footprint_lifetime = (uint32_t)pages;
- }
- if (purgeable_pages) {
- pages = (get_task_purgeable_size(task) / PAGE_SIZE_64);
- assert(((uint32_t)pages) == pages);
- *purgeable_pages = (uint32_t)pages;
- }
-}
-
-static void
-memorystatus_get_task_phys_footprint_page_counts(task_t task,
- uint64_t *internal_pages, uint64_t *internal_compressed_pages,
- uint64_t *purgeable_nonvolatile_pages, uint64_t *purgeable_nonvolatile_compressed_pages,
- uint64_t *alternate_accounting_pages, uint64_t *alternate_accounting_compressed_pages,
- uint64_t *iokit_mapped_pages, uint64_t *page_table_pages)
-{
- assert(task);
-
- if (internal_pages) {
- *internal_pages = (get_task_internal(task) / PAGE_SIZE_64);
- }
-
- if (internal_compressed_pages) {
- *internal_compressed_pages = (get_task_internal_compressed(task) / PAGE_SIZE_64);
- }
-
- if (purgeable_nonvolatile_pages) {
- *purgeable_nonvolatile_pages = (get_task_purgeable_nonvolatile(task) / PAGE_SIZE_64);
- }
-
- if (purgeable_nonvolatile_compressed_pages) {
- *purgeable_nonvolatile_compressed_pages = (get_task_purgeable_nonvolatile_compressed(task) / PAGE_SIZE_64);
- }
-
- if (alternate_accounting_pages) {
- *alternate_accounting_pages = (get_task_alternate_accounting(task) / PAGE_SIZE_64);
- }
-
- if (alternate_accounting_compressed_pages) {
- *alternate_accounting_compressed_pages = (get_task_alternate_accounting_compressed(task) / PAGE_SIZE_64);
- }
-
- if (iokit_mapped_pages) {
- *iokit_mapped_pages = (get_task_iokit_mapped(task) / PAGE_SIZE_64);
- }
-
- if (page_table_pages) {
- *page_table_pages = (get_task_page_table(task) / PAGE_SIZE_64);
- }
-}
-
-/*
- * This routine only acts on the global jetsam event snapshot.
- * Updating the process's entry can race when the memorystatus_thread
- * has chosen to kill a process that is racing to exit on another core.
- */
-static void
-memorystatus_update_jetsam_snapshot_entry_locked(proc_t p, uint32_t kill_cause, uint64_t killtime)
-{
- memorystatus_jetsam_snapshot_entry_t *entry = NULL;
- memorystatus_jetsam_snapshot_t *snapshot = NULL;
- memorystatus_jetsam_snapshot_entry_t *snapshot_list = NULL;
-
- unsigned int i;
-
- LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED);
-
- if (memorystatus_jetsam_snapshot_count == 0) {
- /*
- * No active snapshot.
- * Nothing to do.
- */
- return;
- }
-
- /*
- * Sanity check as this routine should only be called
- * from a jetsam kill path.
- */
- assert(kill_cause != 0 && killtime != 0);
-
- snapshot = memorystatus_jetsam_snapshot;
- snapshot_list = memorystatus_jetsam_snapshot->entries;
-
- for (i = 0; i < memorystatus_jetsam_snapshot_count; i++) {
- if (snapshot_list[i].pid == p->p_pid) {
- entry = &snapshot_list[i];
-
- if (entry->killed || entry->jse_killtime) {
- /*
- * We apparently raced on the exit path
- * for this process, as it's snapshot entry
- * has already recorded a kill.
- */
- assert(entry->killed && entry->jse_killtime);
- break;
- }
-
- /*
- * Update the entry we just found in the snapshot.
- */
-
- entry->killed = kill_cause;
- entry->jse_killtime = killtime;
- entry->jse_gencount = snapshot->js_gencount;
- entry->jse_idle_delta = p->p_memstat_idle_delta;
-#if CONFIG_FREEZE
- entry->jse_thaw_count = p->p_memstat_thaw_count;
-#else /* CONFIG_FREEZE */
- entry->jse_thaw_count = 0;
-#endif /* CONFIG_FREEZE */
-
- /*
- * If a process has moved between bands since snapshot was
- * initialized, then likely these fields changed too.
- */
- if (entry->priority != p->p_memstat_effectivepriority) {
- strlcpy(entry->name, p->p_name, sizeof(entry->name));
- entry->priority = p->p_memstat_effectivepriority;
- entry->state = memorystatus_build_state(p);
- entry->user_data = p->p_memstat_userdata;
- entry->fds = p->p_fd->fd_nfiles;
+ } else {
+ int flag = (self == TRUE) ? P_DIRTY : P_DIRTY_SHUTDOWN;
+ if (pcontrol && !(p->p_memstat_dirty & flag)) {
+ /* Mark the process as having been dirtied at some point */
+ p->p_memstat_dirty |= (flag | P_DIRTY_MARKED);
+ memorystatus_dirty_count++;
+ ret = 0;
+ } else if ((pcontrol == 0) && (p->p_memstat_dirty & flag)) {
+ if ((flag == P_DIRTY_SHUTDOWN) && (!(p->p_memstat_dirty & P_DIRTY))) {
+ /* Clearing the dirty shutdown flag, and the process is otherwise clean - kill */
+ p->p_memstat_dirty |= P_DIRTY_TERMINATED;
+ kill = true;
+ } else if ((flag == P_DIRTY) && (p->p_memstat_dirty & P_DIRTY_TERMINATED)) {
+ /* Kill previously terminated processes if set clean */
+ kill = true;
}
+ p->p_memstat_dirty &= ~flag;
+ memorystatus_dirty_count--;
+ ret = 0;
+ } else {
+ /* Already set */
+ ret = EALREADY;
+ }
+ }
- /*
- * Always update the page counts on a kill.
- */
-
- uint32_t pages = 0;
- uint32_t max_pages_lifetime = 0;
- uint32_t purgeable_pages = 0;
-
- memorystatus_get_task_page_counts(p->task, &pages, &max_pages_lifetime, &purgeable_pages);
- entry->pages = (uint64_t)pages;
- entry->max_pages_lifetime = (uint64_t)max_pages_lifetime;
- entry->purgeable_pages = (uint64_t)purgeable_pages;
-
- uint64_t internal_pages = 0;
- uint64_t internal_compressed_pages = 0;
- uint64_t purgeable_nonvolatile_pages = 0;
- uint64_t purgeable_nonvolatile_compressed_pages = 0;
- uint64_t alternate_accounting_pages = 0;
- uint64_t alternate_accounting_compressed_pages = 0;
- uint64_t iokit_mapped_pages = 0;
- uint64_t page_table_pages = 0;
-
- memorystatus_get_task_phys_footprint_page_counts(p->task, &internal_pages, &internal_compressed_pages,
- &purgeable_nonvolatile_pages, &purgeable_nonvolatile_compressed_pages,
- &alternate_accounting_pages, &alternate_accounting_compressed_pages,
- &iokit_mapped_pages, &page_table_pages);
-
- entry->jse_internal_pages = internal_pages;
- entry->jse_internal_compressed_pages = internal_compressed_pages;
- entry->jse_purgeable_nonvolatile_pages = purgeable_nonvolatile_pages;
- entry->jse_purgeable_nonvolatile_compressed_pages = purgeable_nonvolatile_compressed_pages;
- entry->jse_alternate_accounting_pages = alternate_accounting_pages;
- entry->jse_alternate_accounting_compressed_pages = alternate_accounting_compressed_pages;
- entry->jse_iokit_mapped_pages = iokit_mapped_pages;
- entry->jse_page_table_pages = page_table_pages;
+ if (ret != 0) {
+ goto exit;
+ }
- uint64_t region_count = 0;
- memorystatus_get_task_memory_region_count(p->task, ®ion_count);
- entry->jse_memory_region_count = region_count;
+ if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
+ now_dirty = TRUE;
+ }
- goto exit;
+ if ((was_dirty == TRUE && now_dirty == FALSE) ||
+ (was_dirty == FALSE && now_dirty == TRUE)) {
+#if CONFIG_DIRTYSTATUS_TRACKING
+ if (dirtystatus_tracking_enabled) {
+ uint32_t pages = 0;
+ memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL);
+ change_event.dsc_pid = p->p_pid;
+ change_event.dsc_event_type = (now_dirty == TRUE) ? kDirtyStatusChangedDirty : kDirtyStatusChangedClean;
+ change_event.dsc_time = mach_absolute_time();
+ change_event.dsc_pages = pages;
+ change_event.dsc_priority = p->p_memstat_effectivepriority;
+ strlcpy(&change_event.dsc_process_name[0], p->p_name, sizeof(change_event.dsc_process_name));
+ notify_change = TRUE;
}
- }
+#endif
- if (entry == NULL) {
- /*
- * The entry was not found in the snapshot, so the process must have
- * launched after the snapshot was initialized.
- * Let's try to append the new entry.
- */
- if (memorystatus_jetsam_snapshot_count < memorystatus_jetsam_snapshot_max) {
+ /* Manage idle exit deferral, if applied */
+ if ((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) {
/*
- * A populated snapshot buffer exists
- * and there is room to init a new entry.
+ * Legacy mode: P_DIRTY_AGING_IN_PROGRESS means the process is in the aging band OR it might be heading back
+ * there once it's clean again. For the legacy case, this only applies if it has some protection window left.
+ * P_DIRTY_DEFER: one-time protection window given at launch
+ * P_DIRTY_DEFER_ALWAYS: protection window given for every dirty->clean transition. Like non-legacy mode.
+ *
+ * Non-Legacy mode: P_DIRTY_AGING_IN_PROGRESS means the process is in the aging band. It will always stop over
+ * in that band on it's way to IDLE.
*/
- assert(memorystatus_jetsam_snapshot_count == snapshot->entry_count);
- unsigned int next = memorystatus_jetsam_snapshot_count;
+ if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
+ /*
+ * New dirty process i.e. "was_dirty == FALSE && now_dirty == TRUE"
+ *
+ * The process will move from its aging band to its higher requested
+ * jetsam band.
+ */
+ boolean_t reset_state = (jetsam_aging_policy != kJetsamAgingPolicyLegacy) ? TRUE : FALSE;
- if (memorystatus_init_jetsam_snapshot_entry_locked(p, &snapshot_list[next], (snapshot->js_gencount)) == TRUE) {
- entry = &snapshot_list[next];
- entry->killed = kill_cause;
- entry->jse_killtime = killtime;
+ memorystatus_invalidate_idle_demotion_locked(p, reset_state);
+ reschedule = TRUE;
+ } else {
+ /*
+ * Process is back from "dirty" to "clean".
+ */
- snapshot->entry_count = ++next;
- memorystatus_jetsam_snapshot_count = next;
+ if (jetsam_aging_policy == kJetsamAgingPolicyLegacy) {
+ if (((p->p_memstat_dirty & P_DIRTY_DEFER_ALWAYS) == FALSE) &&
+ (mach_absolute_time() >= p->p_memstat_idledeadline)) {
+ /*
+ * The process' hasn't enrolled in the "always defer after dirty"
+ * mode and its deadline has expired. It currently
+ * does not reside in any of the aging buckets.
+ *
+ * It's on its way to the JETSAM_PRIORITY_IDLE
+ * bucket via memorystatus_update_idle_priority_locked()
+ * below.
+ *
+ * So all we need to do is reset all the state on the
+ * process that's related to the aging bucket i.e.
+ * the AGING_IN_PROGRESS flag and the timer deadline.
+ */
- if (memorystatus_jetsam_snapshot_count >= memorystatus_jetsam_snapshot_max) {
- /*
- * We just used the last slot in the snapshot buffer.
- * We only want to log it once... so we do it here
- * when we notice we've hit the max.
- */
- printf("memorystatus: WARNING snapshot buffer is full, count %d\n",
- memorystatus_jetsam_snapshot_count);
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ reschedule = TRUE;
+ } else {
+ /*
+ * Process enrolled in "always stop in deferral band after dirty" OR
+ * it still has some protection window left and so
+ * we just re-arm the timer without modifying any
+ * state on the process iff it still wants into that band.
+ */
+
+ if (p->p_memstat_dirty & P_DIRTY_DEFER_ALWAYS) {
+ memorystatus_schedule_idle_demotion_locked(p, TRUE);
+ reschedule = TRUE;
+ } else if (p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) {
+ memorystatus_schedule_idle_demotion_locked(p, FALSE);
+ reschedule = TRUE;
+ }
+ }
+ } else {
+ memorystatus_schedule_idle_demotion_locked(p, TRUE);
+ reschedule = TRUE;
}
}
}
- }
-
-exit:
- if (entry == NULL) {
- /*
- * If we reach here, the snapshot buffer could not be updated.
- * Most likely, the buffer is full, in which case we would have
- * logged a warning in the previous call.
- *
- * For now, we will stop appending snapshot entries.
- * When the buffer is consumed, the snapshot state will reset.
- */
-
- MEMORYSTATUS_DEBUG(4, "memorystatus_update_jetsam_snapshot_entry_locked: failed to update pid %d, priority %d, count %d\n",
- p->p_pid, p->p_memstat_effectivepriority, memorystatus_jetsam_snapshot_count);
- }
- return;
-}
+ memorystatus_update_idle_priority_locked(p);
-#if CONFIG_JETSAM
-void
-memorystatus_pages_update(unsigned int pages_avail)
-{
- memorystatus_available_pages = pages_avail;
+ if (memorystatus_highwater_enabled) {
+ boolean_t ledger_update_needed = TRUE;
+ boolean_t use_active;
+ boolean_t is_fatal;
+ /*
+ * We are in this path because this process transitioned between
+ * dirty <--> clean state. Update the cached memory limits.
+ */
-#if VM_PRESSURE_EVENTS
- /*
- * Since memorystatus_available_pages changes, we should
- * re-evaluate the pressure levels on the system and
- * check if we need to wake the pressure thread.
- * We also update memorystatus_level in that routine.
- */
- vm_pressure_response();
+ if (proc_jetsam_state_is_active_locked(p) == TRUE) {
+ /*
+ * process is pinned in elevated band
+ * or
+ * process is dirty
+ */
+ CACHE_ACTIVE_LIMITS_LOCKED(p, is_fatal);
+ use_active = TRUE;
+ ledger_update_needed = TRUE;
+ } else {
+ /*
+ * process is clean...but if it has opted into pressured-exit
+ * we don't apply the INACTIVE limit till the process has aged
+ * out and is entering the IDLE band.
+ * See memorystatus_update_priority_locked() for that.
+ */
- if (memorystatus_available_pages <= memorystatus_available_pages_pressure) {
- if (memorystatus_hwm_candidates || (memorystatus_available_pages <= memorystatus_available_pages_critical)) {
- memorystatus_thread_wake();
- }
- }
-#if CONFIG_FREEZE
- /*
- * We can't grab the freezer_mutex here even though that synchronization would be correct to inspect
- * the # of frozen processes and wakeup the freezer thread. Reason being that we come here into this
- * code with (possibly) the page-queue locks held and preemption disabled. So trying to grab a mutex here
- * will result in the "mutex with preemption disabled" panic.
- */
+ if (p->p_memstat_dirty & P_DIRTY_ALLOW_IDLE_EXIT) {
+ ledger_update_needed = FALSE;
+ } else {
+ CACHE_INACTIVE_LIMITS_LOCKED(p, is_fatal);
+ use_active = FALSE;
+ ledger_update_needed = TRUE;
+ }
+ }
- if (memorystatus_freeze_thread_should_run() == TRUE) {
- /*
- * The freezer thread is usually woken up by some user-space call i.e. pid_hibernate(any process).
- * That trigger isn't invoked often enough and so we are enabling this explicit wakeup here.
- */
- if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
- thread_wakeup((event_t)&memorystatus_freeze_wakeup);
- }
- }
-#endif /* CONFIG_FREEZE */
+ /*
+ * Enforce the new limits by writing to the ledger.
+ *
+ * This is a hot path and holding the proc_list_lock while writing to the ledgers,
+ * (where the task lock is taken) is bad. So, we temporarily drop the proc_list_lock.
+ * We aren't traversing the jetsam bucket list here, so we should be safe.
+ * See rdar://21394491.
+ */
-#else /* VM_PRESSURE_EVENTS */
+ if (ledger_update_needed && proc_ref_locked(p) == p) {
+ int ledger_limit;
+ if (p->p_memstat_memlimit > 0) {
+ ledger_limit = p->p_memstat_memlimit;
+ } else {
+ ledger_limit = -1;
+ }
+ proc_list_unlock();
+ task_set_phys_footprint_limit_internal(p->task, ledger_limit, NULL, use_active, is_fatal);
+ proc_list_lock();
+ proc_rele_locked(p);
- boolean_t critical, delta;
+ MEMORYSTATUS_DEBUG(3, "memorystatus_dirty_set: new limit on pid %d (%dMB %s) priority(%d) dirty?=0x%x %s\n",
+ p->p_pid, (p->p_memstat_memlimit > 0 ? p->p_memstat_memlimit : -1),
+ (p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT ? "F " : "NF"), p->p_memstat_effectivepriority, p->p_memstat_dirty,
+ (p->p_memstat_dirty ? ((p->p_memstat_dirty & P_DIRTY) ? "isdirty" : "isclean") : ""));
+ }
+ }
- if (!memorystatus_delta) {
- return;
+ /* If the deferral state changed, reschedule the demotion timer */
+ if (reschedule) {
+ memorystatus_reschedule_idle_demotion_locked();
+ }
}
- critical = (pages_avail < memorystatus_available_pages_critical) ? TRUE : FALSE;
- delta = ((pages_avail >= (memorystatus_available_pages + memorystatus_delta))
- || (memorystatus_available_pages >= (pages_avail + memorystatus_delta))) ? TRUE : FALSE;
+ if (kill) {
+ if (proc_ref_locked(p) == p) {
+ proc_list_unlock();
+ psignal(p, SIGKILL);
+ proc_list_lock();
+ proc_rele_locked(p);
+ }
+ }
- if (critical || delta) {
- unsigned int total_pages;
+exit:
+ proc_list_unlock();
- total_pages = (unsigned int) atop_64(max_mem);
-#if CONFIG_SECLUDED_MEMORY
- total_pages -= vm_page_secluded_count;
-#endif /* CONFIG_SECLUDED_MEMORY */
- memorystatus_level = memorystatus_available_pages * 100 / total_pages;
- memorystatus_thread_wake();
+#if CONFIG_DIRTYSTATUS_TRACKING
+ // Before returning, let's notify the dirtiness status if we have to
+ if (notify_change) {
+ memorystatus_send_dirty_status_change_note(&change_event, sizeof(change_event));
}
-#endif /* VM_PRESSURE_EVENTS */
+#endif
+
+ return ret;
}
-#endif /* CONFIG_JETSAM */
-static boolean_t
-memorystatus_init_jetsam_snapshot_entry_locked(proc_t p, memorystatus_jetsam_snapshot_entry_t *entry, uint64_t gencount)
+int
+memorystatus_dirty_clear(proc_t p, uint32_t pcontrol)
{
- clock_sec_t tv_sec;
- clock_usec_t tv_usec;
- uint32_t pages = 0;
- uint32_t max_pages_lifetime = 0;
- uint32_t purgeable_pages = 0;
- uint64_t internal_pages = 0;
- uint64_t internal_compressed_pages = 0;
- uint64_t purgeable_nonvolatile_pages = 0;
- uint64_t purgeable_nonvolatile_compressed_pages = 0;
- uint64_t alternate_accounting_pages = 0;
- uint64_t alternate_accounting_compressed_pages = 0;
- uint64_t iokit_mapped_pages = 0;
- uint64_t page_table_pages = 0;
- uint64_t region_count = 0;
- uint64_t cids[COALITION_NUM_TYPES];
+ int ret = 0;
- memset(entry, 0, sizeof(memorystatus_jetsam_snapshot_entry_t));
+ MEMORYSTATUS_DEBUG(1, "memorystatus_dirty_clear(): %d 0x%x 0x%x\n", p->p_pid, pcontrol, p->p_memstat_dirty);
- entry->pid = p->p_pid;
- strlcpy(&entry->name[0], p->p_name, sizeof(entry->name));
- entry->priority = p->p_memstat_effectivepriority;
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DIRTY_CLEAR), p->p_pid, pcontrol, 0, 0, 0);
- memorystatus_get_task_page_counts(p->task, &pages, &max_pages_lifetime, &purgeable_pages);
- entry->pages = (uint64_t)pages;
- entry->max_pages_lifetime = (uint64_t)max_pages_lifetime;
- entry->purgeable_pages = (uint64_t)purgeable_pages;
+ proc_list_lock();
- memorystatus_get_task_phys_footprint_page_counts(p->task, &internal_pages, &internal_compressed_pages,
- &purgeable_nonvolatile_pages, &purgeable_nonvolatile_compressed_pages,
- &alternate_accounting_pages, &alternate_accounting_compressed_pages,
- &iokit_mapped_pages, &page_table_pages);
+ if ((p->p_listflag & P_LIST_EXITED) != 0) {
+ /*
+ * Process is on its way out.
+ */
+ ret = EBUSY;
+ goto exit;
+ }
- entry->jse_internal_pages = internal_pages;
- entry->jse_internal_compressed_pages = internal_compressed_pages;
- entry->jse_purgeable_nonvolatile_pages = purgeable_nonvolatile_pages;
- entry->jse_purgeable_nonvolatile_compressed_pages = purgeable_nonvolatile_compressed_pages;
- entry->jse_alternate_accounting_pages = alternate_accounting_pages;
- entry->jse_alternate_accounting_compressed_pages = alternate_accounting_compressed_pages;
- entry->jse_iokit_mapped_pages = iokit_mapped_pages;
- entry->jse_page_table_pages = page_table_pages;
+ if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
+ ret = EPERM;
+ goto exit;
+ }
- memorystatus_get_task_memory_region_count(p->task, ®ion_count);
- entry->jse_memory_region_count = region_count;
+ if (!(p->p_memstat_dirty & P_DIRTY_TRACK)) {
+ /* Dirty tracking not enabled */
+ ret = EINVAL;
+ goto exit;
+ }
- entry->state = memorystatus_build_state(p);
- entry->user_data = p->p_memstat_userdata;
- memcpy(&entry->uuid[0], &p->p_uuid[0], sizeof(p->p_uuid));
- entry->fds = p->p_fd->fd_nfiles;
+ if (!pcontrol || (pcontrol & (PROC_DIRTY_LAUNCH_IN_PROGRESS | PROC_DIRTY_DEFER | PROC_DIRTY_DEFER_ALWAYS)) == 0) {
+ ret = EINVAL;
+ goto exit;
+ }
- absolutetime_to_microtime(get_task_cpu_time(p->task), &tv_sec, &tv_usec);
- entry->cpu_time.tv_sec = (int64_t)tv_sec;
- entry->cpu_time.tv_usec = (int64_t)tv_usec;
+ if (pcontrol & PROC_DIRTY_LAUNCH_IN_PROGRESS) {
+ p->p_memstat_dirty &= ~P_DIRTY_LAUNCH_IN_PROGRESS;
+ }
- assert(p->p_stats != NULL);
- entry->jse_starttime = p->p_stats->ps_start; /* abstime process started */
- entry->jse_killtime = 0; /* abstime jetsam chose to kill process */
- entry->killed = 0; /* the jetsam kill cause */
- entry->jse_gencount = gencount; /* indicates a pass through jetsam thread, when process was targeted to be killed */
+ /* This can be set and cleared exactly once. */
+ if (pcontrol & (PROC_DIRTY_DEFER | PROC_DIRTY_DEFER_ALWAYS)) {
+ if (p->p_memstat_dirty & P_DIRTY_DEFER) {
+ p->p_memstat_dirty &= ~(P_DIRTY_DEFER);
+ }
- entry->jse_idle_delta = p->p_memstat_idle_delta; /* Most recent timespan spent in idle-band */
+ if (p->p_memstat_dirty & P_DIRTY_DEFER_ALWAYS) {
+ p->p_memstat_dirty &= ~(P_DIRTY_DEFER_ALWAYS);
+ }
-#if CONFIG_FREEZE
- entry->jse_thaw_count = p->p_memstat_thaw_count;
-#else /* CONFIG_FREEZE */
- entry->jse_thaw_count = 0;
-#endif /* CONFIG_FREEZE */
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ memorystatus_update_idle_priority_locked(p);
+ memorystatus_reschedule_idle_demotion_locked();
+ }
- proc_coalitionids(p, cids);
- entry->jse_coalition_jetsam_id = cids[COALITION_TYPE_JETSAM];
+ ret = 0;
+exit:
+ proc_list_unlock();
- return TRUE;
+ return ret;
}
-static void
-memorystatus_init_snapshot_vmstats(memorystatus_jetsam_snapshot_t *snapshot)
+int
+memorystatus_dirty_get(proc_t p, boolean_t locked)
{
- kern_return_t kr = KERN_SUCCESS;
- mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
- vm_statistics64_data_t vm_stat;
+ int ret = 0;
- if ((kr = host_statistics64(host_self(), HOST_VM_INFO64, (host_info64_t)&vm_stat, &count)) != KERN_SUCCESS) {
- printf("memorystatus_init_jetsam_snapshot_stats: host_statistics64 failed with %d\n", kr);
- memset(&snapshot->stats, 0, sizeof(snapshot->stats));
- } else {
- snapshot->stats.free_pages = vm_stat.free_count;
- snapshot->stats.active_pages = vm_stat.active_count;
- snapshot->stats.inactive_pages = vm_stat.inactive_count;
- snapshot->stats.throttled_pages = vm_stat.throttled_count;
- snapshot->stats.purgeable_pages = vm_stat.purgeable_count;
- snapshot->stats.wired_pages = vm_stat.wire_count;
+ if (!locked) {
+ proc_list_lock();
+ }
- snapshot->stats.speculative_pages = vm_stat.speculative_count;
- snapshot->stats.filebacked_pages = vm_stat.external_page_count;
- snapshot->stats.anonymous_pages = vm_stat.internal_page_count;
- snapshot->stats.compressions = vm_stat.compressions;
- snapshot->stats.decompressions = vm_stat.decompressions;
- snapshot->stats.compressor_pages = vm_stat.compressor_page_count;
- snapshot->stats.total_uncompressed_pages_in_compressor = vm_stat.total_uncompressed_pages_in_compressor;
+ if (p->p_memstat_dirty & P_DIRTY_TRACK) {
+ ret |= PROC_DIRTY_TRACKED;
+ if (p->p_memstat_dirty & P_DIRTY_ALLOW_IDLE_EXIT) {
+ ret |= PROC_DIRTY_ALLOWS_IDLE_EXIT;
+ }
+ if (p->p_memstat_dirty & P_DIRTY) {
+ ret |= PROC_DIRTY_IS_DIRTY;
+ }
+ if (p->p_memstat_dirty & P_DIRTY_LAUNCH_IN_PROGRESS) {
+ ret |= PROC_DIRTY_LAUNCH_IS_IN_PROGRESS;
+ }
}
- get_zone_map_size(&snapshot->stats.zone_map_size, &snapshot->stats.zone_map_capacity);
- get_largest_zone_info(snapshot->stats.largest_zone_name, sizeof(snapshot->stats.largest_zone_name),
- &snapshot->stats.largest_zone_size);
-}
+ if (!locked) {
+ proc_list_unlock();
+ }
-/*
- * Collect vm statistics at boot.
- * Called only once (see kern_exec.c)
- * Data can be consumed at any time.
- */
-void
-memorystatus_init_at_boot_snapshot()
-{
- memorystatus_init_snapshot_vmstats(&memorystatus_at_boot_snapshot);
- memorystatus_at_boot_snapshot.entry_count = 0;
- memorystatus_at_boot_snapshot.notification_time = 0; /* updated when consumed */
- memorystatus_at_boot_snapshot.snapshot_time = mach_absolute_time();
+ return ret;
}
-static void
-memorystatus_init_jetsam_snapshot_locked(memorystatus_jetsam_snapshot_t *od_snapshot, uint32_t ods_list_count )
+int
+memorystatus_on_terminate(proc_t p)
{
- proc_t p, next_p;
- unsigned int b = 0, i = 0;
+ int sig;
- memorystatus_jetsam_snapshot_t *snapshot = NULL;
- memorystatus_jetsam_snapshot_entry_t *snapshot_list = NULL;
- unsigned int snapshot_max = 0;
+ proc_list_lock();
- LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED);
+ p->p_memstat_dirty |= P_DIRTY_TERMINATED;
- if (od_snapshot) {
+ if (((p->p_memstat_dirty & (P_DIRTY_TRACK | P_DIRTY_IS_DIRTY)) == P_DIRTY_TRACK) ||
+ (p->p_memstat_state & P_MEMSTAT_SUSPENDED)) {
/*
- * This is an on_demand snapshot
+ * Mark as terminated and issue SIGKILL if:-
+ * - process is clean, or,
+ * - if process is dirty but suspended. This case is likely
+ * an extension because apps don't opt into dirty-tracking
+ * and daemons aren't suspended.
*/
- snapshot = od_snapshot;
- snapshot_list = od_snapshot->entries;
- snapshot_max = ods_list_count;
+#if DEVELOPMENT || DEBUG
+ if (p->p_memstat_state & P_MEMSTAT_SUSPENDED) {
+ os_log(OS_LOG_DEFAULT, "memorystatus: sending suspended process %s (pid %d) SIGKILL",
+ (*p->p_name ? p->p_name : "unknown"), p->p_pid);
+ }
+#endif /* DEVELOPMENT || DEBUG */
+ sig = SIGKILL;
} else {
- /*
- * This is a jetsam event snapshot
- */
- snapshot = memorystatus_jetsam_snapshot;
- snapshot_list = memorystatus_jetsam_snapshot->entries;
- snapshot_max = memorystatus_jetsam_snapshot_max;
+ /* Dirty, terminated, or state tracking is unsupported; issue SIGTERM to allow cleanup */
+ sig = SIGTERM;
}
- /*
- * Init the snapshot header information
- */
- memorystatus_init_snapshot_vmstats(snapshot);
- snapshot->snapshot_time = mach_absolute_time();
- snapshot->notification_time = 0;
- snapshot->js_gencount = 0;
+ proc_list_unlock();
+
+ return sig;
+}
+
+void
+memorystatus_on_suspend(proc_t p)
+{
+#if CONFIG_FREEZE
+ uint32_t pages;
+ memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL);
+#endif
+ proc_list_lock();
+#if CONFIG_FREEZE
+ memorystatus_suspended_count++;
+#endif
+ p->p_memstat_state |= P_MEMSTAT_SUSPENDED;
+ proc_list_unlock();
+}
- next_p = memorystatus_get_first_proc_locked(&b, TRUE);
- while (next_p) {
- p = next_p;
- next_p = memorystatus_get_next_proc_locked(&b, p, TRUE);
+extern uint64_t memorystatus_thaw_count_since_boot;
- if (FALSE == memorystatus_init_jetsam_snapshot_entry_locked(p, &snapshot_list[i], snapshot->js_gencount)) {
- continue;
- }
+void
+memorystatus_on_resume(proc_t p)
+{
+#if CONFIG_FREEZE
+ boolean_t frozen;
+ pid_t pid;
+#endif
- MEMORYSTATUS_DEBUG(0, "jetsam snapshot pid %d, uuid = %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n",
- p->p_pid,
- p->p_uuid[0], p->p_uuid[1], p->p_uuid[2], p->p_uuid[3], p->p_uuid[4], p->p_uuid[5], p->p_uuid[6], p->p_uuid[7],
- p->p_uuid[8], p->p_uuid[9], p->p_uuid[10], p->p_uuid[11], p->p_uuid[12], p->p_uuid[13], p->p_uuid[14], p->p_uuid[15]);
+ proc_list_lock();
- if (++i == snapshot_max) {
- break;
+#if CONFIG_FREEZE
+ frozen = (p->p_memstat_state & P_MEMSTAT_FROZEN);
+ if (frozen) {
+ /*
+ * Now that we don't _thaw_ a process completely,
+ * resuming it (and having some on-demand swapins)
+ * shouldn't preclude it from being counted as frozen.
+ *
+ * memorystatus_frozen_count--;
+ *
+ * We preserve the P_MEMSTAT_FROZEN state since the process
+ * could have state on disk AND so will deserve some protection
+ * in the jetsam bands.
+ */
+ if ((p->p_memstat_state & P_MEMSTAT_REFREEZE_ELIGIBLE) == 0) {
+ p->p_memstat_state |= P_MEMSTAT_REFREEZE_ELIGIBLE;
+ memorystatus_refreeze_eligible_count++;
}
- }
-
- snapshot->entry_count = i;
+ p->p_memstat_thaw_count++;
- if (!od_snapshot) {
- /* update the system buffer count */
- memorystatus_jetsam_snapshot_count = i;
+ memorystatus_thaw_count++;
+ memorystatus_thaw_count_since_boot++;
}
-}
-
-#if DEVELOPMENT || DEBUG
-#if CONFIG_JETSAM
-static int
-memorystatus_cmd_set_panic_bits(user_addr_t buffer, uint32_t buffer_size)
-{
- int ret;
- memorystatus_jetsam_panic_options_t debug;
+ memorystatus_suspended_count--;
- if (buffer_size != sizeof(memorystatus_jetsam_panic_options_t)) {
- return EINVAL;
- }
+ pid = p->p_pid;
+#endif
- ret = copyin(buffer, &debug, buffer_size);
- if (ret) {
- return ret;
- }
+ /*
+ * P_MEMSTAT_FROZEN will remain unchanged. This used to be:
+ * p->p_memstat_state &= ~(P_MEMSTAT_SUSPENDED | P_MEMSTAT_FROZEN);
+ */
+ p->p_memstat_state &= ~P_MEMSTAT_SUSPENDED;
- /* Panic bits match kMemorystatusKilled* enum */
- memorystatus_jetsam_panic_debug = (memorystatus_jetsam_panic_debug & ~debug.mask) | (debug.data & debug.mask);
+ proc_list_unlock();
- /* Copyout new value */
- debug.data = memorystatus_jetsam_panic_debug;
- ret = copyout(&debug, buffer, sizeof(memorystatus_jetsam_panic_options_t));
+#if CONFIG_FREEZE
+ if (frozen) {
+ memorystatus_freeze_entry_t data = { pid, FALSE, 0 };
+ memorystatus_send_note(kMemorystatusFreezeNote, &data, sizeof(data));
+ }
+#endif
+}
- return ret;
+void
+memorystatus_on_inactivity(proc_t p)
+{
+#pragma unused(p)
+#if CONFIG_FREEZE
+ /* Wake the freeze thread */
+ thread_wakeup((event_t)&memorystatus_freeze_wakeup);
+#endif
}
-#endif /* CONFIG_JETSAM */
/*
- * Triggers a sort_order on a specified jetsam priority band.
- * This is for testing only, used to force a path through the sort
- * function.
+ * The proc_list_lock is held by the caller.
*/
-static int
-memorystatus_cmd_test_jetsam_sort(int priority, int sort_order)
+static uint32_t
+memorystatus_build_state(proc_t p)
{
- int error = 0;
-
- unsigned int bucket_index = 0;
+ uint32_t snapshot_state = 0;
- if (priority == -1) {
- /* Use as shorthand for default priority */
- bucket_index = JETSAM_PRIORITY_DEFAULT;
- } else {
- bucket_index = (unsigned int)priority;
+ /* General */
+ if (p->p_memstat_state & P_MEMSTAT_SUSPENDED) {
+ snapshot_state |= kMemorystatusSuspended;
+ }
+ if (p->p_memstat_state & P_MEMSTAT_FROZEN) {
+ snapshot_state |= kMemorystatusFrozen;
+ }
+ if (p->p_memstat_state & P_MEMSTAT_REFREEZE_ELIGIBLE) {
+ snapshot_state |= kMemorystatusWasThawed;
+ }
+ if (p->p_memstat_state & P_MEMSTAT_PRIORITY_ASSERTION) {
+ snapshot_state |= kMemorystatusAssertion;
}
- error = memorystatus_sort_bucket(bucket_index, sort_order);
+ /* Tracking */
+ if (p->p_memstat_dirty & P_DIRTY_TRACK) {
+ snapshot_state |= kMemorystatusTracked;
+ }
+ if ((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) {
+ snapshot_state |= kMemorystatusSupportsIdleExit;
+ }
+ if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
+ snapshot_state |= kMemorystatusDirty;
+ }
- return error;
+ return snapshot_state;
}
-#endif /* DEVELOPMENT || DEBUG */
-
-/*
- * Prepare the process to be killed (set state, update snapshot) and kill it.
- */
-static uint64_t memorystatus_purge_before_jetsam_success = 0;
-
static boolean_t
-memorystatus_kill_proc(proc_t p, uint32_t cause, os_reason_t jetsam_reason, boolean_t *killed)
+kill_idle_exit_proc(void)
{
- pid_t aPid = 0;
- uint32_t aPid_ep = 0;
-
- uint64_t killtime = 0;
- clock_sec_t tv_sec;
- clock_usec_t tv_usec;
- uint32_t tv_msec;
- boolean_t retval = FALSE;
- uint64_t num_pages_purged = 0;
-
- aPid = p->p_pid;
- aPid_ep = p->p_memstat_effectivepriority;
-
- if (cause != kMemorystatusKilledVnodes && cause != kMemorystatusKilledZoneMapExhaustion) {
- /*
- * Genuine memory pressure and not other (vnode/zone) resource exhaustion.
- */
- boolean_t success = FALSE;
-
- networking_memstatus_callout(p, cause);
- num_pages_purged = vm_purgeable_purge_task_owned(p->task);
+ proc_t p, victim_p = PROC_NULL;
+ uint64_t current_time, footprint_of_killed_proc;
+ boolean_t killed = FALSE;
+ unsigned int i = 0;
+ os_reason_t jetsam_reason = OS_REASON_NULL;
- if (num_pages_purged) {
- /*
- * We actually purged something and so let's
- * check if we need to continue with the kill.
- */
- if (cause == kMemorystatusKilledHiwat) {
- uint64_t footprint_in_bytes = get_task_phys_footprint(p->task);
- uint64_t memlimit_in_bytes = (((uint64_t)p->p_memstat_memlimit) * 1024ULL * 1024ULL); /* convert MB to bytes */
- success = (footprint_in_bytes <= memlimit_in_bytes);
- } else {
- success = (memorystatus_avail_pages_below_pressure() == FALSE);
- }
+ /* Pick next idle exit victim. */
+ current_time = mach_absolute_time();
- if (success) {
- memorystatus_purge_before_jetsam_success++;
+ jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_IDLE_EXIT);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("kill_idle_exit_proc: failed to allocate jetsam reason\n");
+ }
- os_log_with_startup_serial(OS_LOG_DEFAULT, "memorystatus: purged %llu pages from pid %d [%s] and avoided %s\n",
- num_pages_purged, aPid, (*p->p_name ? p->p_name : "unknown"), memorystatus_kill_cause_name[cause]);
+ proc_list_lock();
- *killed = FALSE;
+ p = memorystatus_get_first_proc_locked(&i, FALSE);
+ while (p) {
+ /* No need to look beyond the idle band */
+ if (p->p_memstat_effectivepriority != JETSAM_PRIORITY_IDLE) {
+ break;
+ }
- return TRUE;
+ if ((p->p_memstat_dirty & (P_DIRTY_ALLOW_IDLE_EXIT | P_DIRTY_IS_DIRTY | P_DIRTY_TERMINATED)) == (P_DIRTY_ALLOW_IDLE_EXIT)) {
+ if (current_time >= p->p_memstat_idledeadline) {
+ p->p_memstat_dirty |= P_DIRTY_TERMINATED;
+ victim_p = proc_ref_locked(p);
+ break;
}
}
+
+ p = memorystatus_get_next_proc_locked(&i, p, FALSE);
}
-#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
- MEMORYSTATUS_DEBUG(1, "jetsam: %s pid %d [%s] - %lld Mb > 1 (%d Mb)\n",
- (memorystatus_jetsam_policy & kPolicyDiagnoseActive) ? "suspending": "killing",
- aPid, (*p->p_name ? p->p_name : "unknown"),
- (footprint_in_bytes / (1024ULL * 1024ULL)), /* converted bytes to MB */
- p->p_memstat_memlimit);
-#endif /* CONFIG_JETSAM && (DEVELOPMENT || DEBUG) */
+ proc_list_unlock();
- killtime = mach_absolute_time();
- absolutetime_to_microtime(killtime, &tv_sec, &tv_usec);
- tv_msec = tv_usec / 1000;
+ if (victim_p) {
+ printf("memorystatus: killing_idle_process pid %d [%s] jetsam_reason->osr_code: %llu\n", victim_p->p_pid, (*victim_p->p_name ? victim_p->p_name : "unknown"), jetsam_reason->osr_code);
+ killed = memorystatus_do_kill(victim_p, kMemorystatusKilledIdleExit, jetsam_reason, &footprint_of_killed_proc);
+ proc_rele(victim_p);
+ } else {
+ os_reason_free(jetsam_reason);
+ }
-#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
- if (memorystatus_jetsam_policy & kPolicyDiagnoseActive) {
- if (cause == kMemorystatusKilledHiwat) {
- MEMORYSTATUS_DEBUG(1, "jetsam: suspending pid %d [%s] for diagnosis - memorystatus_available_pages: %d\n",
- aPid, (*p->p_name ? p->p_name: "(unknown)"), memorystatus_available_pages);
- } else {
- int activeProcess = p->p_memstat_state & P_MEMSTAT_FOREGROUND;
- if (activeProcess) {
- MEMORYSTATUS_DEBUG(1, "jetsam: suspending pid %d [%s] (active) for diagnosis - memorystatus_available_pages: %d\n",
- aPid, (*p->p_name ? p->p_name: "(unknown)"), memorystatus_available_pages);
-
- if (memorystatus_jetsam_policy & kPolicyDiagnoseFirst) {
- jetsam_diagnostic_suspended_one_active_proc = 1;
- printf("jetsam: returning after suspending first active proc - %d\n", aPid);
- }
- }
- }
+ return killed;
+}
- proc_list_lock();
- /* This diagnostic code is going away soon. Ignore the kMemorystatusInvalid cause here. */
- memorystatus_update_jetsam_snapshot_entry_locked(p, kMemorystatusInvalid, killtime);
- proc_list_unlock();
+static void
+memorystatus_thread_wake(void)
+{
+ int thr_id = 0;
+ int active_thr = atomic_load(&active_jetsam_threads);
- p->p_memstat_state |= P_MEMSTAT_DIAG_SUSPENDED;
+ /* Wakeup all the jetsam threads */
+ for (thr_id = 0; thr_id < active_thr; thr_id++) {
+ thread_wakeup((event_t)&jetsam_threads[thr_id].memorystatus_wakeup);
+ }
+}
- if (p) {
- task_suspend(p->task);
- *killed = TRUE;
- }
- } else
-#endif /* CONFIG_JETSAM && (DEVELOPMENT || DEBUG) */
- {
- proc_list_lock();
- memorystatus_update_jetsam_snapshot_entry_locked(p, cause, killtime);
- proc_list_unlock();
+#if CONFIG_JETSAM
- char kill_reason_string[128];
+static void
+memorystatus_thread_pool_max()
+{
+ /* Increase the jetsam thread pool to max_jetsam_threads */
+ int max_threads = max_jetsam_threads;
+ printf("Expanding memorystatus pool to %d!\n", max_threads);
+ atomic_store(&active_jetsam_threads, max_threads);
+}
- if (cause == kMemorystatusKilledHiwat) {
- strlcpy(kill_reason_string, "killing_highwater_process", 128);
- } else {
- if (aPid_ep == JETSAM_PRIORITY_IDLE) {
- strlcpy(kill_reason_string, "killing_idle_process", 128);
- } else {
- strlcpy(kill_reason_string, "killing_top_process", 128);
- }
- }
+static void
+memorystatus_thread_pool_default()
+{
+ /* Restore the jetsam thread pool to a single thread */
+ printf("Reverting memorystatus pool back to 1\n");
+ atomic_store(&active_jetsam_threads, 1);
+}
- os_log_with_startup_serial(OS_LOG_DEFAULT, "%lu.%03d memorystatus: %s pid %d [%s] (%s %d) - memorystatus_available_pages: %llu\n",
- (unsigned long)tv_sec, tv_msec, kill_reason_string,
- aPid, (*p->p_name ? p->p_name : "unknown"),
- memorystatus_kill_cause_name[cause], aPid_ep, (uint64_t)memorystatus_available_pages);
+#endif /* CONFIG_JETSAM */
- /*
- * memorystatus_do_kill drops a reference, so take another one so we can
- * continue to use this exit reason even after memorystatus_do_kill()
- * returns
- */
- os_reason_ref(jetsam_reason);
+extern void vm_pressure_response(void);
- retval = memorystatus_do_kill(p, cause, jetsam_reason);
+static int
+memorystatus_thread_block(uint32_t interval_ms, thread_continue_t continuation)
+{
+ struct jetsam_thread_state *jetsam_thread = jetsam_current_thread();
- *killed = retval;
+ assert(jetsam_thread != NULL);
+ if (interval_ms) {
+ assert_wait_timeout(&jetsam_thread->memorystatus_wakeup, THREAD_UNINT, interval_ms, NSEC_PER_MSEC);
+ } else {
+ assert_wait(&jetsam_thread->memorystatus_wakeup, THREAD_UNINT);
}
- return retval;
+ return thread_block(continuation);
}
-/*
- * Jetsam the first process in the queue.
- */
static boolean_t
-memorystatus_kill_top_process(boolean_t any, boolean_t sort_flag, uint32_t cause, os_reason_t jetsam_reason,
- int32_t *priority, uint32_t *errors)
+memorystatus_avail_pages_below_pressure(void)
{
- pid_t aPid;
- proc_t p = PROC_NULL, next_p = PROC_NULL;
- boolean_t new_snapshot = FALSE, force_new_snapshot = FALSE, killed = FALSE, freed_mem = FALSE;
- unsigned int i = 0;
- uint32_t aPid_ep;
- int32_t local_max_kill_prio = JETSAM_PRIORITY_IDLE;
-
-#ifndef CONFIG_FREEZE
-#pragma unused(any)
-#endif
-
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_START,
- memorystatus_available_pages, 0, 0, 0, 0);
-
-
#if CONFIG_JETSAM
- if (sort_flag == TRUE) {
- (void)memorystatus_sort_bucket(JETSAM_PRIORITY_FOREGROUND, JETSAM_SORT_DEFAULT);
- }
-
- local_max_kill_prio = max_kill_priority;
-
- force_new_snapshot = FALSE;
+ return memorystatus_available_pages <= memorystatus_available_pages_pressure;
+#else /* CONFIG_JETSAM */
+ return FALSE;
+#endif /* CONFIG_JETSAM */
+}
+static boolean_t
+memorystatus_avail_pages_below_critical(void)
+{
+#if CONFIG_JETSAM
+ return memorystatus_available_pages <= memorystatus_available_pages_critical;
#else /* CONFIG_JETSAM */
+ return FALSE;
+#endif /* CONFIG_JETSAM */
+}
- if (sort_flag == TRUE) {
- (void)memorystatus_sort_bucket(JETSAM_PRIORITY_IDLE, JETSAM_SORT_DEFAULT);
- }
+static boolean_t
+memorystatus_post_snapshot(int32_t priority, uint32_t cause)
+{
+ boolean_t is_idle_priority;
- /*
- * On macos, we currently only have 2 reasons to be here:
- *
- * kMemorystatusKilledZoneMapExhaustion
- * AND
- * kMemorystatusKilledVMCompressorSpaceShortage
- *
- * If we are here because of kMemorystatusKilledZoneMapExhaustion, we will consider
- * any and all processes as eligible kill candidates since we need to avoid a panic.
- *
- * Since this function can be called async. it is harder to toggle the max_kill_priority
- * value before and after a call. And so we use this local variable to set the upper band
- * on the eligible kill bands.
- */
- if (cause == kMemorystatusKilledZoneMapExhaustion) {
- local_max_kill_prio = JETSAM_PRIORITY_MAX;
+ if (jetsam_aging_policy == kJetsamAgingPolicyLegacy) {
+ is_idle_priority = (priority == JETSAM_PRIORITY_IDLE);
} else {
- local_max_kill_prio = max_kill_priority;
+ is_idle_priority = (priority == JETSAM_PRIORITY_IDLE || priority == JETSAM_PRIORITY_IDLE_DEFERRED);
}
-
+#if CONFIG_JETSAM
+#pragma unused(cause)
/*
- * And, because we are here under extreme circumstances, we force a snapshot even for
- * IDLE kills.
+ * Don't generate logs for steady-state idle-exit kills,
+ * unless it is overridden for debug or by the device
+ * tree.
*/
- force_new_snapshot = TRUE;
-
-#endif /* CONFIG_JETSAM */
-
- proc_list_lock();
-
- next_p = memorystatus_get_first_proc_locked(&i, TRUE);
- while (next_p && (next_p->p_memstat_effectivepriority <= local_max_kill_prio)) {
-#if DEVELOPMENT || DEBUG
- int procSuspendedForDiagnosis;
-#endif /* DEVELOPMENT || DEBUG */
-
- p = next_p;
- next_p = memorystatus_get_next_proc_locked(&i, p, TRUE);
-#if DEVELOPMENT || DEBUG
- procSuspendedForDiagnosis = p->p_memstat_state & P_MEMSTAT_DIAG_SUSPENDED;
-#endif /* DEVELOPMENT || DEBUG */
-
- aPid = p->p_pid;
- aPid_ep = p->p_memstat_effectivepriority;
-
- if (p->p_memstat_state & (P_MEMSTAT_ERROR | P_MEMSTAT_TERMINATED)) {
- continue; /* with lock held */
- }
-
-#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
- if ((memorystatus_jetsam_policy & kPolicyDiagnoseActive) && procSuspendedForDiagnosis) {
- printf("jetsam: continuing after ignoring proc suspended already for diagnosis - %d\n", aPid);
- continue;
- }
-#endif /* CONFIG_JETSAM && (DEVELOPMENT || DEBUG) */
-
- if (cause == kMemorystatusKilledVnodes) {
- /*
- * If the system runs out of vnodes, we systematically jetsam
- * processes in hopes of stumbling onto a vnode gain that helps
- * the system recover. The process that happens to trigger
- * this path has no known relationship to the vnode shortage.
- * Deadlock avoidance: attempt to safeguard the caller.
- */
-
- if (p == current_proc()) {
- /* do not jetsam the current process */
- continue;
- }
- }
-
-#if CONFIG_FREEZE
- boolean_t skip;
- boolean_t reclaim_proc = !(p->p_memstat_state & P_MEMSTAT_LOCKED);
- if (any || reclaim_proc) {
- skip = FALSE;
- } else {
- skip = TRUE;
- }
+ return !is_idle_priority || memorystatus_idle_snapshot;
- if (skip) {
- continue;
- } else
-#endif
- {
- if (proc_ref_locked(p) == p) {
- /*
- * Mark as terminated so that if exit1() indicates success, but the process (for example)
- * is blocked in task_exception_notify(), it'll be skipped if encountered again - see
- * <rdar://problem/13553476>. This is cheaper than examining P_LEXIT, which requires the
- * acquisition of the proc lock.
- */
- p->p_memstat_state |= P_MEMSTAT_TERMINATED;
- } else {
- /*
- * We need to restart the search again because
- * proc_ref_locked _can_ drop the proc_list lock
- * and we could have lost our stored next_p via
- * an exit() on another core.
- */
- i = 0;
- next_p = memorystatus_get_first_proc_locked(&i, TRUE);
- continue;
- }
+#else /* CONFIG_JETSAM */
+ /*
+ * Don't generate logs for steady-state idle-exit kills,
+ * unless
+ * - it is overridden for debug or by the device
+ * tree.
+ * OR
+ * - the kill causes are important i.e. not kMemorystatusKilledIdleExit
+ */
- /*
- * Capture a snapshot if none exists and:
- * - we are forcing a new snapshot creation, either because:
- * - on a particular platform we need these snapshots every time, OR
- * - a boot-arg/embedded device tree property has been set.
- * - priority was not requested (this is something other than an ambient kill)
- * - the priority was requested *and* the targeted process is not at idle priority
- */
- if ((memorystatus_jetsam_snapshot_count == 0) &&
- (force_new_snapshot || memorystatus_idle_snapshot || ((!priority) || (priority && (aPid_ep != JETSAM_PRIORITY_IDLE))))) {
- memorystatus_init_jetsam_snapshot_locked(NULL, 0);
- new_snapshot = TRUE;
- }
+ boolean_t snapshot_eligible_kill_cause = (is_reason_thrashing(cause) || is_reason_zone_map_exhaustion(cause));
+ return !is_idle_priority || memorystatus_idle_snapshot || snapshot_eligible_kill_cause;
+#endif /* CONFIG_JETSAM */
+}
- proc_list_unlock();
+static boolean_t
+memorystatus_action_needed(void)
+{
+#if CONFIG_JETSAM
+ return is_reason_thrashing(kill_under_pressure_cause) ||
+ is_reason_zone_map_exhaustion(kill_under_pressure_cause) ||
+ memorystatus_available_pages <= memorystatus_available_pages_pressure;
+#else /* CONFIG_JETSAM */
+ return is_reason_thrashing(kill_under_pressure_cause) ||
+ is_reason_zone_map_exhaustion(kill_under_pressure_cause);
+#endif /* CONFIG_JETSAM */
+}
- freed_mem = memorystatus_kill_proc(p, cause, jetsam_reason, &killed); /* purged and/or killed 'p' */
- /* Success? */
- if (freed_mem) {
- if (killed) {
- if (priority) {
- *priority = aPid_ep;
- }
- } else {
- /* purged */
- proc_list_lock();
- p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
- proc_list_unlock();
- }
- proc_rele(p);
- goto exit;
- }
+static boolean_t
+memorystatus_act_on_hiwat_processes(uint32_t *errors, uint32_t *hwm_kill, boolean_t *post_snapshot, __unused boolean_t *is_critical, uint64_t *memory_reclaimed)
+{
+ boolean_t purged = FALSE, killed = FALSE;
- /*
- * Failure - first unwind the state,
- * then fall through to restart the search.
- */
- proc_list_lock();
- proc_rele_locked(p);
- p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
- p->p_memstat_state |= P_MEMSTAT_ERROR;
- *errors += 1;
+ *memory_reclaimed = 0;
+ killed = memorystatus_kill_hiwat_proc(errors, &purged, memory_reclaimed);
- i = 0;
- next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ if (killed) {
+ *hwm_kill = *hwm_kill + 1;
+ *post_snapshot = TRUE;
+ return TRUE;
+ } else {
+ if (purged == FALSE) {
+ /* couldn't purge and couldn't kill */
+ memorystatus_hwm_candidates = FALSE;
}
}
- proc_list_unlock();
-
-exit:
- os_reason_free(jetsam_reason);
+#if CONFIG_JETSAM
+ /* No highwater processes to kill. Continue or stop for now? */
+ if (!is_reason_thrashing(kill_under_pressure_cause) &&
+ !is_reason_zone_map_exhaustion(kill_under_pressure_cause) &&
+ (memorystatus_available_pages > memorystatus_available_pages_critical)) {
+ /*
+ * We are _not_ out of pressure but we are above the critical threshold and there's:
+ * - no compressor thrashing
+ * - enough zone memory
+ * - no more HWM processes left.
+ * For now, don't kill any other processes.
+ */
- /* Clear snapshot if freshly captured and no target was found */
- if (new_snapshot && !killed) {
- proc_list_lock();
- memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
- proc_list_unlock();
- }
+ if (*hwm_kill == 0) {
+ memorystatus_thread_wasted_wakeup++;
+ }
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_END,
- memorystatus_available_pages, killed ? aPid : 0, 0, 0, 0);
+ *is_critical = FALSE;
- return killed;
+ return TRUE;
+ }
+#endif /* CONFIG_JETSAM */
+
+ return FALSE;
}
/*
- * Jetsam aggressively
+ * kJetsamHighRelaunchCandidatesThreshold defines the percentage of candidates
+ * in the idle & deferred bands that need to be bad candidates in order to trigger
+ * aggressive jetsam.
+ */
+#define kJetsamHighRelaunchCandidatesThreshold (100)
+
+/* kJetsamMinCandidatesThreshold defines the minimum number of candidates in the
+ * idle/deferred bands to trigger aggressive jetsam. This value basically decides
+ * how much memory the system is ready to hold in the lower bands without triggering
+ * aggressive jetsam. This number should ideally be tuned based on the memory config
+ * of the device.
*/
+#define kJetsamMinCandidatesThreshold (5)
+
static boolean_t
-memorystatus_kill_top_process_aggressive(uint32_t cause, int aggr_count,
- int32_t priority_max, uint32_t *errors)
+memorystatus_aggressive_jetsam_needed_sysproc_aging(__unused int jld_eval_aggressive_count, __unused int *jld_idle_kills, __unused int jld_idle_kill_candidates, int *total_candidates, int *elevated_bucket_count)
{
- pid_t aPid;
- proc_t p = PROC_NULL, next_p = PROC_NULL;
- boolean_t new_snapshot = FALSE, killed = FALSE;
- int kill_count = 0;
- unsigned int i = 0;
- int32_t aPid_ep = 0;
- unsigned int memorystatus_level_snapshot = 0;
- uint64_t killtime = 0;
- clock_sec_t tv_sec;
- clock_usec_t tv_usec;
- uint32_t tv_msec;
- os_reason_t jetsam_reason = OS_REASON_NULL;
+ boolean_t aggressive_jetsam_needed = false;
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_START,
- memorystatus_available_pages, priority_max, 0, 0, 0);
+ /*
+ * For the kJetsamAgingPolicySysProcsReclaimedFirst aging policy, we maintain the jetsam
+ * relaunch behavior for all daemons. Also, daemons and apps are aged in deferred bands on
+ * every dirty->clean transition. For this aging policy, the best way to determine if
+ * aggressive jetsam is needed, is to see if the kill candidates are mostly bad candidates.
+ * If yes, then we need to go to higher bands to reclaim memory.
+ */
+ proc_list_lock();
+ /* Get total candidate counts for idle and idle deferred bands */
+ *total_candidates = memstat_bucket[JETSAM_PRIORITY_IDLE].count + memstat_bucket[system_procs_aging_band].count;
+ /* Get counts of bad kill candidates in idle and idle deferred bands */
+ int bad_candidates = memstat_bucket[JETSAM_PRIORITY_IDLE].relaunch_high_count + memstat_bucket[system_procs_aging_band].relaunch_high_count;
- memorystatus_sort_bucket(JETSAM_PRIORITY_FOREGROUND, JETSAM_SORT_DEFAULT);
+ *elevated_bucket_count = memstat_bucket[JETSAM_PRIORITY_ELEVATED_INACTIVE].count;
- jetsam_reason = os_reason_create(OS_REASON_JETSAM, cause);
- if (jetsam_reason == OS_REASON_NULL) {
- printf("memorystatus_kill_top_process_aggressive: failed to allocate exit reason\n");
- }
+ proc_list_unlock();
- proc_list_lock();
+ /* Check if the number of bad candidates is greater than kJetsamHighRelaunchCandidatesThreshold % */
+ aggressive_jetsam_needed = (((bad_candidates * 100) / *total_candidates) >= kJetsamHighRelaunchCandidatesThreshold);
+
+ /*
+ * Since the new aging policy bases the aggressive jetsam trigger on percentage of
+ * bad candidates, it is prone to being overly aggressive. In order to mitigate that,
+ * make sure the system is really under memory pressure before triggering aggressive
+ * jetsam.
+ */
+ if (memorystatus_available_pages > memorystatus_sysproc_aging_aggr_pages) {
+ aggressive_jetsam_needed = false;
+ }
- next_p = memorystatus_get_first_proc_locked(&i, TRUE);
- while (next_p) {
#if DEVELOPMENT || DEBUG
- int activeProcess;
- int procSuspendedForDiagnosis;
+ printf("memorystatus: aggressive%d: [%s] Bad Candidate Threshold Check (total: %d, bad: %d, threshold: %d %%); Memory Pressure Check (available_pgs: %llu, threshold_pgs: %llu)\n",
+ jld_eval_aggressive_count, aggressive_jetsam_needed ? "PASSED" : "FAILED", *total_candidates, bad_candidates,
+ kJetsamHighRelaunchCandidatesThreshold, (uint64_t)MEMORYSTATUS_LOG_AVAILABLE_PAGES, (uint64_t)memorystatus_sysproc_aging_aggr_pages);
#endif /* DEVELOPMENT || DEBUG */
+ return aggressive_jetsam_needed;
+}
- if (((next_p->p_listflag & P_LIST_EXITED) != 0) ||
- ((unsigned int)(next_p->p_memstat_effectivepriority) != i)) {
- /*
- * We have raced with next_p running on another core.
- * It may be exiting or it may have moved to a different
- * jetsam priority band. This means we have lost our
- * place in line while traversing the jetsam list. We
- * attempt to recover by rewinding to the beginning of the band
- * we were already traversing. By doing this, we do not guarantee
- * that no process escapes this aggressive march, but we can make
- * skipping an entire range of processes less likely. (PR-21069019)
- */
+/*
+ * Gets memory back from various system caches.
+ * Called before jetsamming in the foreground band in the hope that we'll
+ * avoid a jetsam.
+ */
+static void
+memorystatus_approaching_fg_band(boolean_t *corpse_list_purged)
+{
+ assert(corpse_list_purged != NULL);
+ pmap_release_pages_fast();
+ memorystatus_issue_fg_band_notify();
+ if (total_corpses_count() > 0 && !*corpse_list_purged) {
+ task_purge_all_corpses();
+ *corpse_list_purged = TRUE;
+ }
+}
- MEMORYSTATUS_DEBUG(1, "memorystatus: aggressive%d: rewinding band %d, %s(%d) moved or exiting.\n",
- aggr_count, i, (*next_p->p_name ? next_p->p_name : "unknown"), next_p->p_pid);
+static boolean_t
+memorystatus_aggressive_jetsam_needed_default(__unused int jld_eval_aggressive_count, int *jld_idle_kills, int jld_idle_kill_candidates, int *total_candidates, int *elevated_bucket_count)
+{
+ boolean_t aggressive_jetsam_needed = false;
+ /* Jetsam Loop Detection - locals */
+ memstat_bucket_t *bucket;
+ int jld_bucket_count = 0;
- next_p = memorystatus_get_first_proc_locked(&i, TRUE);
- continue;
- }
+ proc_list_lock();
+ switch (jetsam_aging_policy) {
+ case kJetsamAgingPolicyLegacy:
+ bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE];
+ jld_bucket_count = bucket->count;
+ bucket = &memstat_bucket[JETSAM_PRIORITY_AGING_BAND1];
+ jld_bucket_count += bucket->count;
+ break;
+ case kJetsamAgingPolicyAppsReclaimedFirst:
+ bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE];
+ jld_bucket_count = bucket->count;
+ bucket = &memstat_bucket[system_procs_aging_band];
+ jld_bucket_count += bucket->count;
+ bucket = &memstat_bucket[applications_aging_band];
+ jld_bucket_count += bucket->count;
+ break;
+ case kJetsamAgingPolicyNone:
+ default:
+ bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE];
+ jld_bucket_count = bucket->count;
+ break;
+ }
- p = next_p;
- next_p = memorystatus_get_next_proc_locked(&i, p, TRUE);
+ bucket = &memstat_bucket[JETSAM_PRIORITY_ELEVATED_INACTIVE];
+ *elevated_bucket_count = bucket->count;
+ *total_candidates = jld_bucket_count;
+ proc_list_unlock();
- if (p->p_memstat_effectivepriority > priority_max) {
- /*
- * Bail out of this killing spree if we have
- * reached beyond the priority_max jetsam band.
- * That is, we kill up to and through the
- * priority_max jetsam band.
- */
- proc_list_unlock();
- goto exit;
- }
+ aggressive_jetsam_needed = (*jld_idle_kills > jld_idle_kill_candidates);
#if DEVELOPMENT || DEBUG
- activeProcess = p->p_memstat_state & P_MEMSTAT_FOREGROUND;
- procSuspendedForDiagnosis = p->p_memstat_state & P_MEMSTAT_DIAG_SUSPENDED;
+ if (aggressive_jetsam_needed) {
+ printf("memorystatus: aggressive%d: idle candidates: %d, idle kills: %d\n",
+ jld_eval_aggressive_count,
+ jld_idle_kill_candidates,
+ *jld_idle_kills);
+ }
#endif /* DEVELOPMENT || DEBUG */
+ return aggressive_jetsam_needed;
+}
- aPid = p->p_pid;
- aPid_ep = p->p_memstat_effectivepriority;
+static boolean_t
+memorystatus_act_aggressive(uint32_t cause, os_reason_t jetsam_reason, int *jld_idle_kills, boolean_t *corpse_list_purged, boolean_t *post_snapshot, uint64_t *memory_reclaimed)
+{
+ boolean_t aggressive_jetsam_needed = false;
+ boolean_t killed;
+ uint32_t errors = 0;
+ uint64_t footprint_of_killed_proc = 0;
+ int elevated_bucket_count = 0;
+ int total_candidates = 0;
+ *memory_reclaimed = 0;
- if (p->p_memstat_state & (P_MEMSTAT_ERROR | P_MEMSTAT_TERMINATED)) {
- continue;
- }
+ /*
+ * The aggressive jetsam logic looks at the number of times it has been in the
+ * aggressive loop to determine the max priority band it should kill upto. The
+ * static variables below are used to track that property.
+ *
+ * To reset those values, the implementation checks if it has been
+ * memorystatus_jld_eval_period_msecs since the parameters were reset.
+ */
+ static int jld_eval_aggressive_count = 0;
+ static int32_t jld_priority_band_max = JETSAM_PRIORITY_UI_SUPPORT;
+ static uint64_t jld_timestamp_msecs = 0;
+ static int jld_idle_kill_candidates = 0;
-#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
- if ((memorystatus_jetsam_policy & kPolicyDiagnoseActive) && procSuspendedForDiagnosis) {
- printf("jetsam: continuing after ignoring proc suspended already for diagnosis - %d\n", aPid);
- continue;
- }
-#endif /* CONFIG_JETSAM && (DEVELOPMENT || DEBUG) */
+ if (memorystatus_jld_enabled == FALSE) {
+ /* If aggressive jetsam is disabled, nothing to do here */
+ return FALSE;
+ }
- /*
- * Capture a snapshot if none exists.
- */
- if (memorystatus_jetsam_snapshot_count == 0) {
- memorystatus_init_jetsam_snapshot_locked(NULL, 0);
- new_snapshot = TRUE;
- }
+ /* Get current timestamp (msecs only) */
+ struct timeval jld_now_tstamp = {0, 0};
+ uint64_t jld_now_msecs = 0;
+ microuptime(&jld_now_tstamp);
+ jld_now_msecs = (jld_now_tstamp.tv_sec * 1000);
+ /*
+ * The aggressive jetsam logic looks at the number of candidates and their
+ * properties to decide if aggressive jetsam should be engaged.
+ */
+ if (jetsam_aging_policy == kJetsamAgingPolicySysProcsReclaimedFirst) {
/*
- * Mark as terminated so that if exit1() indicates success, but the process (for example)
- * is blocked in task_exception_notify(), it'll be skipped if encountered again - see
- * <rdar://problem/13553476>. This is cheaper than examining P_LEXIT, which requires the
- * acquisition of the proc lock.
+ * For the kJetsamAgingPolicySysProcsReclaimedFirst aging policy, the logic looks at the number of
+ * candidates in the idle and deferred band and how many out of them are marked as high relaunch
+ * probability.
*/
- p->p_memstat_state |= P_MEMSTAT_TERMINATED;
-
- killtime = mach_absolute_time();
- absolutetime_to_microtime(killtime, &tv_sec, &tv_usec);
- tv_msec = tv_usec / 1000;
-
- /* Shift queue, update stats */
- memorystatus_update_jetsam_snapshot_entry_locked(p, cause, killtime);
-
+ aggressive_jetsam_needed = memorystatus_aggressive_jetsam_needed_sysproc_aging(jld_eval_aggressive_count,
+ jld_idle_kills, jld_idle_kill_candidates, &total_candidates, &elevated_bucket_count);
+ } else {
/*
- * In order to kill the target process, we will drop the proc_list_lock.
- * To guaranteee that p and next_p don't disappear out from under the lock,
- * we must take a ref on both.
- * If we cannot get a reference, then it's likely we've raced with
- * that process exiting on another core.
+ * The other aging policies look at number of candidate processes over a specific time window and
+ * evaluate if the system is in a jetsam loop. If yes, aggressive jetsam is triggered.
*/
- if (proc_ref_locked(p) == p) {
- if (next_p) {
- while (next_p && (proc_ref_locked(next_p) != next_p)) {
- proc_t temp_p;
-
- /*
- * We must have raced with next_p exiting on another core.
- * Recover by getting the next eligible process in the band.
- */
-
- MEMORYSTATUS_DEBUG(1, "memorystatus: aggressive%d: skipping %d [%s] (exiting?)\n",
- aggr_count, next_p->p_pid, (*next_p->p_name ? next_p->p_name : "(unknown)"));
-
- temp_p = next_p;
- next_p = memorystatus_get_next_proc_locked(&i, temp_p, TRUE);
- }
- }
- proc_list_unlock();
-
- printf("%lu.%03d memorystatus: %s%d pid %d [%s] (%s %d) - memorystatus_available_pages: %llu\n",
- (unsigned long)tv_sec, tv_msec,
- ((aPid_ep == JETSAM_PRIORITY_IDLE) ? "killing_idle_process_aggressive" : "killing_top_process_aggressive"),
- aggr_count, aPid, (*p->p_name ? p->p_name : "unknown"),
- memorystatus_kill_cause_name[cause], aPid_ep, (uint64_t)memorystatus_available_pages);
-
- memorystatus_level_snapshot = memorystatus_level;
+ aggressive_jetsam_needed = memorystatus_aggressive_jetsam_needed_default(jld_eval_aggressive_count,
+ jld_idle_kills, jld_idle_kill_candidates, &total_candidates, &elevated_bucket_count);
+ }
- /*
- * memorystatus_do_kill() drops a reference, so take another one so we can
- * continue to use this exit reason even after memorystatus_do_kill()
- * returns.
- */
- os_reason_ref(jetsam_reason);
- killed = memorystatus_do_kill(p, cause, jetsam_reason);
+ /*
+ * Check if its been really long since the aggressive jetsam evaluation
+ * parameters have been refreshed. This logic also resets the jld_eval_aggressive_count
+ * counter to make sure we reset the aggressive jetsam severity.
+ */
+ boolean_t param_reval = false;
- /* Success? */
- if (killed) {
- proc_rele(p);
- kill_count++;
- p = NULL;
- killed = FALSE;
+ if ((total_candidates == 0) ||
+ (jld_now_msecs > (jld_timestamp_msecs + memorystatus_jld_eval_period_msecs))) {
+ jld_timestamp_msecs = jld_now_msecs;
+ jld_idle_kill_candidates = total_candidates;
+ *jld_idle_kills = 0;
+ jld_eval_aggressive_count = 0;
+ jld_priority_band_max = JETSAM_PRIORITY_UI_SUPPORT;
+ param_reval = true;
+ }
- /*
- * Continue the killing spree.
- */
- proc_list_lock();
- if (next_p) {
- proc_rele_locked(next_p);
- }
+ /*
+ * If the parameters have been updated, re-evaluate the aggressive_jetsam_needed condition for
+ * the non kJetsamAgingPolicySysProcsReclaimedFirst policy since its based on jld_idle_kill_candidates etc.
+ */
+ if ((param_reval == true) && (jetsam_aging_policy != kJetsamAgingPolicySysProcsReclaimedFirst)) {
+ aggressive_jetsam_needed = (*jld_idle_kills > jld_idle_kill_candidates);
+ }
- if (aPid_ep == JETSAM_PRIORITY_FOREGROUND && memorystatus_aggressive_jetsam_lenient == TRUE) {
- if (memorystatus_level > memorystatus_level_snapshot && ((memorystatus_level - memorystatus_level_snapshot) >= AGGRESSIVE_JETSAM_LENIENT_MODE_THRESHOLD)) {
+ /*
+ * It is also possible that the system is down to a very small number of processes in the candidate
+ * bands. In that case, the decisions made by the memorystatus_aggressive_jetsam_needed_* routines
+ * would not be useful. In that case, do not trigger aggressive jetsam.
+ */
+ if (total_candidates < kJetsamMinCandidatesThreshold) {
#if DEVELOPMENT || DEBUG
- printf("Disabling Lenient mode after one-time deployment.\n");
+ printf("memorystatus: aggressive: [FAILED] Low Candidate Count (current: %d, threshold: %d)\n", total_candidates, kJetsamMinCandidatesThreshold);
#endif /* DEVELOPMENT || DEBUG */
- memorystatus_aggressive_jetsam_lenient = FALSE;
- break;
- }
- }
+ aggressive_jetsam_needed = false;
+ }
- continue;
- }
+ if (aggressive_jetsam_needed == false) {
+ /* Either the aging policy or the candidate count decided that aggressive jetsam is not needed. Nothing more to do here. */
+ return FALSE;
+ }
- /*
- * Failure - first unwind the state,
- * then fall through to restart the search.
- */
- proc_list_lock();
- proc_rele_locked(p);
- if (next_p) {
- proc_rele_locked(next_p);
- }
- p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
- p->p_memstat_state |= P_MEMSTAT_ERROR;
- *errors += 1;
- p = NULL;
- }
+ /* Looks like aggressive jetsam is needed */
+ jld_eval_aggressive_count++;
+ if (jld_eval_aggressive_count == memorystatus_jld_eval_aggressive_count) {
+ memorystatus_approaching_fg_band(corpse_list_purged);
+ } else if (jld_eval_aggressive_count > memorystatus_jld_eval_aggressive_count) {
/*
- * Failure - restart the search at the beginning of
- * the band we were already traversing.
- *
- * We might have raced with "p" exiting on another core, resulting in no
- * ref on "p". Or, we may have failed to kill "p".
- *
- * Either way, we fall thru to here, leaving the proc in the
- * P_MEMSTAT_TERMINATED or P_MEMSTAT_ERROR state.
- *
- * And, we hold the the proc_list_lock at this point.
+ * Bump up the jetsam priority limit (eg: the bucket index)
+ * Enforce bucket index sanity.
*/
-
- next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ if ((memorystatus_jld_eval_aggressive_priority_band_max < 0) ||
+ (memorystatus_jld_eval_aggressive_priority_band_max >= MEMSTAT_BUCKET_COUNT)) {
+ /*
+ * Do nothing. Stick with the default level.
+ */
+ } else {
+ jld_priority_band_max = memorystatus_jld_eval_aggressive_priority_band_max;
+ }
}
- proc_list_unlock();
+ /* Visit elevated processes first */
+ while (elevated_bucket_count) {
+ elevated_bucket_count--;
-exit:
- os_reason_free(jetsam_reason);
+ /*
+ * memorystatus_kill_elevated_process() drops a reference,
+ * so take another one so we can continue to use this exit reason
+ * even after it returns.
+ */
- /* Clear snapshot if freshly captured and no target was found */
- if (new_snapshot && (kill_count == 0)) {
- proc_list_lock();
- memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
- proc_list_unlock();
+ os_reason_ref(jetsam_reason);
+ killed = memorystatus_kill_elevated_process(
+ cause,
+ jetsam_reason,
+ JETSAM_PRIORITY_ELEVATED_INACTIVE,
+ jld_eval_aggressive_count,
+ &errors, &footprint_of_killed_proc);
+ if (killed) {
+ *post_snapshot = TRUE;
+ *memory_reclaimed += footprint_of_killed_proc;
+ if (memorystatus_avail_pages_below_pressure()) {
+ /*
+ * Still under pressure.
+ * Find another pinned processes.
+ */
+ continue;
+ } else {
+ return TRUE;
+ }
+ } else {
+ /*
+ * No pinned processes left to kill.
+ * Abandon elevated band.
+ */
+ break;
+ }
}
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_END,
- memorystatus_available_pages, killed ? aPid : 0, kill_count, 0, 0);
+ /*
+ * memorystatus_kill_processes_aggressive() allocates its own
+ * jetsam_reason so the kMemorystatusKilledProcThrashing cause
+ * is consistent throughout the aggressive march.
+ */
+ killed = memorystatus_kill_processes_aggressive(
+ kMemorystatusKilledProcThrashing,
+ jld_eval_aggressive_count,
+ jld_priority_band_max,
+ &errors, &footprint_of_killed_proc);
- if (kill_count > 0) {
+ if (killed) {
+ /* Always generate logs after aggressive kill */
+ *post_snapshot = TRUE;
+ *memory_reclaimed += footprint_of_killed_proc;
+ *jld_idle_kills = 0;
return TRUE;
- } else {
- return FALSE;
}
+
+ return FALSE;
}
-static boolean_t
-memorystatus_kill_hiwat_proc(uint32_t *errors, boolean_t *purged)
+
+static void
+memorystatus_thread(void *param __unused, wait_result_t wr __unused)
{
- pid_t aPid = 0;
- proc_t p = PROC_NULL, next_p = PROC_NULL;
- boolean_t new_snapshot = FALSE, killed = FALSE, freed_mem = FALSE;
- unsigned int i = 0;
- uint32_t aPid_ep;
- os_reason_t jetsam_reason = OS_REASON_NULL;
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM_HIWAT) | DBG_FUNC_START,
- memorystatus_available_pages, 0, 0, 0, 0);
+ boolean_t post_snapshot = FALSE;
+ uint32_t errors = 0;
+ uint32_t hwm_kill = 0;
+ boolean_t sort_flag = TRUE;
+ boolean_t corpse_list_purged = FALSE;
+ int jld_idle_kills = 0;
+ struct jetsam_thread_state *jetsam_thread = jetsam_current_thread();
+ uint64_t total_memory_reclaimed = 0;
- jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_HIGHWATER);
- if (jetsam_reason == OS_REASON_NULL) {
- printf("memorystatus_kill_hiwat_proc: failed to allocate exit reason\n");
+ assert(jetsam_thread != NULL);
+ if (jetsam_thread->inited == FALSE) {
+ /*
+ * It's the first time the thread has run, so just mark the thread as privileged and block.
+ * This avoids a spurious pass with unset variables, as set out in <rdar://problem/9609402>.
+ */
+
+ char name[32];
+ thread_wire(host_priv_self(), current_thread(), TRUE);
+ snprintf(name, 32, "VM_memorystatus_%d", jetsam_thread->index + 1);
+
+ /* Limit all but one thread to the lower jetsam bands, as that's where most of the victims are. */
+ if (jetsam_thread->index == 0) {
+ if (vm_pageout_state.vm_restricted_to_single_processor == TRUE) {
+ thread_vm_bind_group_add();
+ }
+ jetsam_thread->limit_to_low_bands = FALSE;
+ } else {
+ jetsam_thread->limit_to_low_bands = TRUE;
+ }
+#if CONFIG_THREAD_GROUPS
+ thread_group_vm_add();
+#endif
+ thread_set_thread_name(current_thread(), name);
+ jetsam_thread->inited = TRUE;
+ memorystatus_thread_block(0, memorystatus_thread);
}
- proc_list_lock();
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_SCAN) | DBG_FUNC_START,
+ MEMORYSTATUS_LOG_AVAILABLE_PAGES, memorystatus_jld_enabled, memorystatus_jld_eval_period_msecs, memorystatus_jld_eval_aggressive_count, 0);
- next_p = memorystatus_get_first_proc_locked(&i, TRUE);
- while (next_p) {
- uint64_t footprint_in_bytes = 0;
- uint64_t memlimit_in_bytes = 0;
- boolean_t skip = 0;
+ /*
+ * Jetsam aware version.
+ *
+ * The VM pressure notification thread is working it's way through clients in parallel.
+ *
+ * So, while the pressure notification thread is targeting processes in order of
+ * increasing jetsam priority, we can hopefully reduce / stop it's work by killing
+ * any processes that have exceeded their highwater mark.
+ *
+ * If we run out of HWM processes and our available pages drops below the critical threshold, then,
+ * we target the least recently used process in order of increasing jetsam priority (exception: the FG band).
+ */
+ while (memorystatus_action_needed()) {
+ boolean_t killed;
+ int32_t priority;
+ uint32_t cause;
+ uint64_t memory_reclaimed = 0;
+ uint64_t jetsam_reason_code = JETSAM_REASON_INVALID;
+ os_reason_t jetsam_reason = OS_REASON_NULL;
- p = next_p;
- next_p = memorystatus_get_next_proc_locked(&i, p, TRUE);
+ cause = kill_under_pressure_cause;
+ switch (cause) {
+ case kMemorystatusKilledFCThrashing:
+ jetsam_reason_code = JETSAM_REASON_MEMORY_FCTHRASHING;
+ break;
+ case kMemorystatusKilledVMCompressorThrashing:
+ jetsam_reason_code = JETSAM_REASON_MEMORY_VMCOMPRESSOR_THRASHING;
+ break;
+ case kMemorystatusKilledVMCompressorSpaceShortage:
+ jetsam_reason_code = JETSAM_REASON_MEMORY_VMCOMPRESSOR_SPACE_SHORTAGE;
+ break;
+ case kMemorystatusKilledZoneMapExhaustion:
+ jetsam_reason_code = JETSAM_REASON_ZONE_MAP_EXHAUSTION;
+ break;
+ case kMemorystatusKilledVMPageShortage:
+ /* falls through */
+ default:
+ jetsam_reason_code = JETSAM_REASON_MEMORY_VMPAGESHORTAGE;
+ cause = kMemorystatusKilledVMPageShortage;
+ break;
+ }
- aPid = p->p_pid;
- aPid_ep = p->p_memstat_effectivepriority;
+ /* Highwater */
+ boolean_t is_critical = TRUE;
+ if (memorystatus_act_on_hiwat_processes(&errors, &hwm_kill, &post_snapshot, &is_critical, &memory_reclaimed)) {
+ total_memory_reclaimed += memory_reclaimed;
+ if (is_critical == FALSE) {
+ /*
+ * For now, don't kill any other processes.
+ */
+ break;
+ } else {
+ goto done;
+ }
+ }
- if (p->p_memstat_state & (P_MEMSTAT_ERROR | P_MEMSTAT_TERMINATED)) {
- continue;
+ jetsam_reason = os_reason_create(OS_REASON_JETSAM, jetsam_reason_code);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("memorystatus_thread: failed to allocate jetsam reason\n");
}
- /* skip if no limit set */
- if (p->p_memstat_memlimit <= 0) {
- continue;
+ /* Only unlimited jetsam threads should act aggressive */
+ if (!jetsam_thread->limit_to_low_bands &&
+ memorystatus_act_aggressive(cause, jetsam_reason, &jld_idle_kills, &corpse_list_purged, &post_snapshot, &memory_reclaimed)) {
+ total_memory_reclaimed += memory_reclaimed;
+ goto done;
}
- footprint_in_bytes = get_task_phys_footprint(p->task);
- memlimit_in_bytes = (((uint64_t)p->p_memstat_memlimit) * 1024ULL * 1024ULL); /* convert MB to bytes */
- skip = (footprint_in_bytes <= memlimit_in_bytes);
+ /*
+ * memorystatus_kill_top_process() drops a reference,
+ * so take another one so we can continue to use this exit reason
+ * even after it returns
+ */
+ os_reason_ref(jetsam_reason);
-#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
- if (!skip && (memorystatus_jetsam_policy & kPolicyDiagnoseActive)) {
- if (p->p_memstat_state & P_MEMSTAT_DIAG_SUSPENDED) {
- continue;
+ /* LRU */
+ killed = memorystatus_kill_top_process(TRUE, sort_flag, cause, jetsam_reason, &priority, &errors, &memory_reclaimed);
+ sort_flag = FALSE;
+
+ if (killed) {
+ total_memory_reclaimed += memory_reclaimed;
+ if (memorystatus_post_snapshot(priority, cause) == TRUE) {
+ post_snapshot = TRUE;
}
- }
-#endif /* CONFIG_JETSAM && (DEVELOPMENT || DEBUG) */
-#if CONFIG_FREEZE
- if (!skip) {
- if (p->p_memstat_state & P_MEMSTAT_LOCKED) {
- skip = TRUE;
- } else {
- skip = FALSE;
+ /* Jetsam Loop Detection */
+ if (memorystatus_jld_enabled == TRUE) {
+ if ((priority == JETSAM_PRIORITY_IDLE) || (priority == system_procs_aging_band) || (priority == applications_aging_band)) {
+ jld_idle_kills++;
+ } else {
+ /*
+ * We've reached into bands beyond idle deferred.
+ * We make no attempt to monitor them
+ */
+ }
}
- }
-#endif
- if (skip) {
- continue;
- } else {
- if (memorystatus_jetsam_snapshot_count == 0) {
- memorystatus_init_jetsam_snapshot_locked(NULL, 0);
- new_snapshot = TRUE;
+ /*
+ * If we have jetsammed a process in or above JETSAM_PRIORITY_UI_SUPPORT
+ * then we attempt to relieve pressure by purging corpse memory and notifying
+ * anybody wanting to know this.
+ */
+ if (priority >= JETSAM_PRIORITY_UI_SUPPORT) {
+ memorystatus_approaching_fg_band(&corpse_list_purged);
}
+ goto done;
+ }
- if (proc_ref_locked(p) == p) {
- /*
- * Mark as terminated so that if exit1() indicates success, but the process (for example)
- * is blocked in task_exception_notify(), it'll be skipped if encountered again - see
- * <rdar://problem/13553476>. This is cheaper than examining P_LEXIT, which requires the
- * acquisition of the proc lock.
- */
- p->p_memstat_state |= P_MEMSTAT_TERMINATED;
+ if (memorystatus_avail_pages_below_critical()) {
+ /*
+ * Still under pressure and unable to kill a process - purge corpse memory
+ * and get everything back from the pmap.
+ */
+ pmap_release_pages_fast();
+ if (total_corpses_count() > 0) {
+ task_purge_all_corpses();
+ corpse_list_purged = TRUE;
+ }
- proc_list_unlock();
- } else {
+ if (!jetsam_thread->limit_to_low_bands && memorystatus_avail_pages_below_critical()) {
/*
- * We need to restart the search again because
- * proc_ref_locked _can_ drop the proc_list lock
- * and we could have lost our stored next_p via
- * an exit() on another core.
+ * Still under pressure and unable to kill a process - panic
*/
- i = 0;
- next_p = memorystatus_get_first_proc_locked(&i, TRUE);
- continue;
+ panic("memorystatus_jetsam_thread: no victim! available pages:%llu\n", (uint64_t)MEMORYSTATUS_LOG_AVAILABLE_PAGES);
}
+ }
- freed_mem = memorystatus_kill_proc(p, kMemorystatusKilledHiwat, jetsam_reason, &killed); /* purged and/or killed 'p' */
+done:
- /* Success? */
- if (freed_mem) {
- if (killed == FALSE) {
- /* purged 'p'..don't reset HWM candidate count */
- *purged = TRUE;
+ /*
+ * We do not want to over-kill when thrashing has been detected.
+ * To avoid that, we reset the flag here and notify the
+ * compressor.
+ */
+ if (is_reason_thrashing(kill_under_pressure_cause)) {
+ kill_under_pressure_cause = 0;
+#if CONFIG_JETSAM
+ vm_thrashing_jetsam_done();
+#endif /* CONFIG_JETSAM */
+ } else if (is_reason_zone_map_exhaustion(kill_under_pressure_cause)) {
+ kill_under_pressure_cause = 0;
+ }
- proc_list_lock();
- p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
- proc_list_unlock();
- }
- proc_rele(p);
- goto exit;
- }
- /*
- * Failure - first unwind the state,
- * then fall through to restart the search.
- */
- proc_list_lock();
- proc_rele_locked(p);
- p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
- p->p_memstat_state |= P_MEMSTAT_ERROR;
- *errors += 1;
+ os_reason_free(jetsam_reason);
+ }
- i = 0;
- next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ kill_under_pressure_cause = 0;
+
+ if (errors) {
+ memorystatus_clear_errors();
+ }
+
+ if (post_snapshot) {
+ proc_list_lock();
+ size_t snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) +
+ sizeof(memorystatus_jetsam_snapshot_entry_t) * (memorystatus_jetsam_snapshot_count);
+ uint64_t timestamp_now = mach_absolute_time();
+ memorystatus_jetsam_snapshot->notification_time = timestamp_now;
+ memorystatus_jetsam_snapshot->js_gencount++;
+ if (memorystatus_jetsam_snapshot_count > 0 && (memorystatus_jetsam_snapshot_last_timestamp == 0 ||
+ timestamp_now > memorystatus_jetsam_snapshot_last_timestamp + memorystatus_jetsam_snapshot_timeout)) {
+ proc_list_unlock();
+ int ret = memorystatus_send_note(kMemorystatusSnapshotNote, &snapshot_size, sizeof(snapshot_size));
+ if (!ret) {
+ proc_list_lock();
+ memorystatus_jetsam_snapshot_last_timestamp = timestamp_now;
+ proc_list_unlock();
+ }
+ } else {
+ proc_list_unlock();
}
}
- proc_list_unlock();
-
-exit:
- os_reason_free(jetsam_reason);
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_SCAN) | DBG_FUNC_END,
+ MEMORYSTATUS_LOG_AVAILABLE_PAGES, total_memory_reclaimed, 0, 0, 0);
- /* Clear snapshot if freshly captured and no target was found */
- if (new_snapshot && !killed) {
- proc_list_lock();
- memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
- proc_list_unlock();
- }
+ memorystatus_thread_block(0, memorystatus_thread);
+}
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM_HIWAT) | DBG_FUNC_END,
- memorystatus_available_pages, killed ? aPid : 0, 0, 0, 0);
+/*
+ * Returns TRUE:
+ * when an idle-exitable proc was killed
+ * Returns FALSE:
+ * when there are no more idle-exitable procs found
+ * when the attempt to kill an idle-exitable proc failed
+ */
+boolean_t
+memorystatus_idle_exit_from_VM(void)
+{
+ /*
+ * This routine should no longer be needed since we are
+ * now using jetsam bands on all platforms and so will deal
+ * with IDLE processes within the memorystatus thread itself.
+ *
+ * But we still use it because we observed that macos systems
+ * started heavy compression/swapping with a bunch of
+ * idle-exitable processes alive and doing nothing. We decided
+ * to rather kill those processes than start swapping earlier.
+ */
- return killed;
+ return kill_idle_exit_proc();
}
/*
- * Jetsam a process pinned in the elevated band.
+ * Callback invoked when allowable physical memory footprint exceeded
+ * (dirty pages + IOKit mappings)
*
- * Return: true -- at least one pinned process was jetsammed
- * false -- no pinned process was jetsammed
+ * This is invoked for both advisory, non-fatal per-task high watermarks,
+ * as well as the fatal task memory limits.
*/
-static boolean_t
-memorystatus_kill_elevated_process(uint32_t cause, os_reason_t jetsam_reason, unsigned int band, int aggr_count, uint32_t *errors)
+void
+memorystatus_on_ledger_footprint_exceeded(boolean_t warning, boolean_t memlimit_is_active, boolean_t memlimit_is_fatal)
{
- pid_t aPid = 0;
- proc_t p = PROC_NULL, next_p = PROC_NULL;
- boolean_t new_snapshot = FALSE, killed = FALSE;
- int kill_count = 0;
- uint32_t aPid_ep;
- uint64_t killtime = 0;
- clock_sec_t tv_sec;
- clock_usec_t tv_usec;
- uint32_t tv_msec;
-
-
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_START,
- memorystatus_available_pages, 0, 0, 0, 0);
-
-#if CONFIG_FREEZE
- boolean_t consider_frozen_only = FALSE;
-
- if (band == (unsigned int) memorystatus_freeze_jetsam_band) {
- consider_frozen_only = TRUE;
- }
-#endif /* CONFIG_FREEZE */
-
- proc_list_lock();
-
- next_p = memorystatus_get_first_proc_locked(&band, FALSE);
- while (next_p) {
- p = next_p;
- next_p = memorystatus_get_next_proc_locked(&band, p, FALSE);
+ os_reason_t jetsam_reason = OS_REASON_NULL;
- aPid = p->p_pid;
- aPid_ep = p->p_memstat_effectivepriority;
+ proc_t p = current_proc();
+#if VM_PRESSURE_EVENTS
+ if (warning == TRUE) {
/*
- * Only pick a process pinned in this elevated band
+ * This is a warning path which implies that the current process is close, but has
+ * not yet exceeded its per-process memory limit.
*/
- if (!(p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND)) {
- continue;
+ if (memorystatus_warn_process(p, memlimit_is_active, memlimit_is_fatal, FALSE /* not exceeded */) != TRUE) {
+ /* Print warning, since it's possible that task has not registered for pressure notifications */
+ os_log(OS_LOG_DEFAULT, "memorystatus_on_ledger_footprint_exceeded: failed to warn the current task (%d exiting, or no handler registered?).\n", p->p_pid);
}
+ return;
+ }
+#endif /* VM_PRESSURE_EVENTS */
- if (p->p_memstat_state & (P_MEMSTAT_ERROR | P_MEMSTAT_TERMINATED)) {
- continue;
+ if (memlimit_is_fatal) {
+ /*
+ * If this process has no high watermark or has a fatal task limit, then we have been invoked because the task
+ * has violated either the system-wide per-task memory limit OR its own task limit.
+ */
+ jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_PERPROCESSLIMIT);
+ if (jetsam_reason == NULL) {
+ printf("task_exceeded footprint: failed to allocate jetsam reason\n");
+ } else if (corpse_for_fatal_memkill != 0 && proc_send_synchronous_EXC_RESOURCE(p) == FALSE) {
+ /* Set OS_REASON_FLAG_GENERATE_CRASH_REPORT to generate corpse */
+ jetsam_reason->osr_flags |= OS_REASON_FLAG_GENERATE_CRASH_REPORT;
}
-#if CONFIG_FREEZE
- if (consider_frozen_only && !(p->p_memstat_state & P_MEMSTAT_FROZEN)) {
- continue;
+ if (memorystatus_kill_process_sync(p->p_pid, kMemorystatusKilledPerProcessLimit, jetsam_reason) != TRUE) {
+ printf("task_exceeded_footprint: failed to kill the current task (exiting?).\n");
}
+ } else {
+ /*
+ * HWM offender exists. Done without locks or synchronization.
+ * See comment near its declaration for more details.
+ */
+ memorystatus_hwm_candidates = TRUE;
- if (p->p_memstat_state & P_MEMSTAT_LOCKED) {
- continue;
- }
-#endif /* CONFIG_FREEZE */
+#if VM_PRESSURE_EVENTS
+ /*
+ * The current process is not in the warning path.
+ * This path implies the current process has exceeded a non-fatal (soft) memory limit.
+ * Failure to send note is ignored here.
+ */
+ (void)memorystatus_warn_process(p, memlimit_is_active, memlimit_is_fatal, TRUE /* exceeded */);
-#if DEVELOPMENT || DEBUG
- MEMORYSTATUS_DEBUG(1, "jetsam: elevated%d process pid %d [%s] - memorystatus_available_pages: %d\n",
- aggr_count,
- aPid, (*p->p_name ? p->p_name : "unknown"),
- memorystatus_available_pages);
-#endif /* DEVELOPMENT || DEBUG */
+#endif /* VM_PRESSURE_EVENTS */
+ }
+}
- if (memorystatus_jetsam_snapshot_count == 0) {
- memorystatus_init_jetsam_snapshot_locked(NULL, 0);
- new_snapshot = TRUE;
- }
+void
+memorystatus_log_exception(const int max_footprint_mb, boolean_t memlimit_is_active, boolean_t memlimit_is_fatal)
+{
+ proc_t p = current_proc();
- p->p_memstat_state |= P_MEMSTAT_TERMINATED;
+ /*
+ * The limit violation is logged here, but only once per process per limit.
+ * Soft memory limit is a non-fatal high-water-mark
+ * Hard memory limit is a fatal custom-task-limit or system-wide per-task memory limit.
+ */
- killtime = mach_absolute_time();
- absolutetime_to_microtime(killtime, &tv_sec, &tv_usec);
- tv_msec = tv_usec / 1000;
+ os_log_with_startup_serial(OS_LOG_DEFAULT, "EXC_RESOURCE -> %s[%d] exceeded mem limit: %s%s %d MB (%s)\n",
+ ((p && *p->p_name) ? p->p_name : "unknown"), (p ? p->p_pid : -1), (memlimit_is_active ? "Active" : "Inactive"),
+ (memlimit_is_fatal ? "Hard" : "Soft"), max_footprint_mb,
+ (memlimit_is_fatal ? "fatal" : "non-fatal"));
- memorystatus_update_jetsam_snapshot_entry_locked(p, cause, killtime);
+ return;
+}
- if (proc_ref_locked(p) == p) {
- proc_list_unlock();
- os_log_with_startup_serial(OS_LOG_DEFAULT, "%lu.%03d memorystatus: killing_top_process_elevated%d pid %d [%s] (%s %d) - memorystatus_available_pages: %llu\n",
- (unsigned long)tv_sec, tv_msec,
- aggr_count,
- aPid, (*p->p_name ? p->p_name : "unknown"),
- memorystatus_kill_cause_name[cause], aPid_ep, (uint64_t)memorystatus_available_pages);
+/*
+ * Description:
+ * Evaluates process state to determine which limit
+ * should be applied (active vs. inactive limit).
+ *
+ * Processes that have the 'elevated inactive jetsam band' attribute
+ * are first evaluated based on their current priority band.
+ * presently elevated ==> active
+ *
+ * Processes that opt into dirty tracking are evaluated
+ * based on clean vs dirty state.
+ * dirty ==> active
+ * clean ==> inactive
+ *
+ * Process that do not opt into dirty tracking are
+ * evalulated based on priority level.
+ * Foreground or above ==> active
+ * Below Foreground ==> inactive
+ *
+ * Return: TRUE if active
+ * False if inactive
+ */
+static boolean_t
+proc_jetsam_state_is_active_locked(proc_t p)
+{
+ if ((p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND) &&
+ (p->p_memstat_effectivepriority == JETSAM_PRIORITY_ELEVATED_INACTIVE)) {
+ /*
+ * process has the 'elevated inactive jetsam band' attribute
+ * and process is present in the elevated band
+ * implies active state
+ */
+ return TRUE;
+ } else if (p->p_memstat_dirty & P_DIRTY_TRACK) {
+ /*
+ * process has opted into dirty tracking
+ * active state is based on dirty vs. clean
+ */
+ if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
/*
- * memorystatus_do_kill drops a reference, so take another one so we can
- * continue to use this exit reason even after memorystatus_do_kill()
- * returns
+ * process is dirty
+ * implies active state
*/
- os_reason_ref(jetsam_reason);
- killed = memorystatus_do_kill(p, cause, jetsam_reason);
-
- /* Success? */
- if (killed) {
- proc_rele(p);
- kill_count++;
- goto exit;
- }
-
+ return TRUE;
+ } else {
/*
- * Failure - first unwind the state,
- * then fall through to restart the search.
+ * process is clean
+ * implies inactive state
*/
- proc_list_lock();
- proc_rele_locked(p);
- p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
- p->p_memstat_state |= P_MEMSTAT_ERROR;
- *errors += 1;
+ return FALSE;
}
-
+ } else if (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND) {
/*
- * Failure - restart the search.
- *
- * We might have raced with "p" exiting on another core, resulting in no
- * ref on "p". Or, we may have failed to kill "p".
- *
- * Either way, we fall thru to here, leaving the proc in the
- * P_MEMSTAT_TERMINATED state or P_MEMSTAT_ERROR state.
- *
- * And, we hold the the proc_list_lock at this point.
+ * process is Foreground or higher
+ * implies active state
*/
-
- next_p = memorystatus_get_first_proc_locked(&band, FALSE);
+ return TRUE;
+ } else {
+ /*
+ * process found below Foreground
+ * implies inactive state
+ */
+ return FALSE;
}
+}
+
+static boolean_t
+memorystatus_kill_process_sync(pid_t victim_pid, uint32_t cause, os_reason_t jetsam_reason)
+{
+ boolean_t res;
+
+ uint32_t errors = 0;
+ uint64_t memory_reclaimed = 0;
- proc_list_unlock();
+ if (victim_pid == -1) {
+ /* No pid, so kill first process */
+ res = memorystatus_kill_top_process(TRUE, TRUE, cause, jetsam_reason, NULL, &errors, &memory_reclaimed);
+ } else {
+ res = memorystatus_kill_specific_process(victim_pid, cause, jetsam_reason);
+ }
-exit:
- os_reason_free(jetsam_reason);
+ if (errors) {
+ memorystatus_clear_errors();
+ }
- /* Clear snapshot if freshly captured and no target was found */
- if (new_snapshot && (kill_count == 0)) {
+ if (res == TRUE) {
+ /* Fire off snapshot notification */
proc_list_lock();
- memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
- proc_list_unlock();
+ size_t snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) +
+ sizeof(memorystatus_jetsam_snapshot_entry_t) * memorystatus_jetsam_snapshot_count;
+ uint64_t timestamp_now = mach_absolute_time();
+ memorystatus_jetsam_snapshot->notification_time = timestamp_now;
+ if (memorystatus_jetsam_snapshot_count > 0 && (memorystatus_jetsam_snapshot_last_timestamp == 0 ||
+ timestamp_now > memorystatus_jetsam_snapshot_last_timestamp + memorystatus_jetsam_snapshot_timeout)) {
+ proc_list_unlock();
+ int ret = memorystatus_send_note(kMemorystatusSnapshotNote, &snapshot_size, sizeof(snapshot_size));
+ if (!ret) {
+ proc_list_lock();
+ memorystatus_jetsam_snapshot_last_timestamp = timestamp_now;
+ proc_list_unlock();
+ }
+ } else {
+ proc_list_unlock();
+ }
}
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_END,
- memorystatus_available_pages, killed ? aPid : 0, kill_count, 0, 0);
-
- return killed;
+ return res;
}
+/*
+ * Jetsam a specific process.
+ */
static boolean_t
-memorystatus_kill_process_async(pid_t victim_pid, uint32_t cause)
+memorystatus_kill_specific_process(pid_t victim_pid, uint32_t cause, os_reason_t jetsam_reason)
{
- /*
- * TODO: allow a general async path
- *
- * NOTE: If a new async kill cause is added, make sure to update memorystatus_thread() to
- * add the appropriate exit reason code mapping.
- */
- if ((victim_pid != -1) ||
- (cause != kMemorystatusKilledVMPageShortage &&
- cause != kMemorystatusKilledVMCompressorThrashing &&
- cause != kMemorystatusKilledVMCompressorSpaceShortage &&
- cause != kMemorystatusKilledFCThrashing &&
- cause != kMemorystatusKilledZoneMapExhaustion)) {
+ boolean_t killed;
+ proc_t p;
+ uint64_t killtime = 0;
+ uint64_t footprint_of_killed_proc;
+ clock_sec_t tv_sec;
+ clock_usec_t tv_usec;
+ uint32_t tv_msec;
+
+ /* TODO - add a victim queue and push this into the main jetsam thread */
+
+ p = proc_find(victim_pid);
+ if (!p) {
+ os_reason_free(jetsam_reason);
return FALSE;
}
- kill_under_pressure_cause = cause;
- memorystatus_thread_wake();
- return TRUE;
-}
-
-boolean_t
-memorystatus_kill_on_VM_compressor_space_shortage(boolean_t async)
-{
- if (async) {
- return memorystatus_kill_process_async(-1, kMemorystatusKilledVMCompressorSpaceShortage);
- } else {
- os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_VMCOMPRESSOR_SPACE_SHORTAGE);
- if (jetsam_reason == OS_REASON_NULL) {
- printf("memorystatus_kill_on_VM_compressor_space_shortage -- sync: failed to allocate jetsam reason\n");
- }
+ proc_list_lock();
- return memorystatus_kill_process_sync(-1, kMemorystatusKilledVMCompressorSpaceShortage, jetsam_reason);
+ if (memorystatus_jetsam_snapshot_count == 0) {
+ memorystatus_init_jetsam_snapshot_locked(NULL, 0);
}
-}
-#if CONFIG_JETSAM
-boolean_t
-memorystatus_kill_on_VM_compressor_thrashing(boolean_t async)
-{
- if (async) {
- return memorystatus_kill_process_async(-1, kMemorystatusKilledVMCompressorThrashing);
- } else {
- os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_VMCOMPRESSOR_THRASHING);
- if (jetsam_reason == OS_REASON_NULL) {
- printf("memorystatus_kill_on_VM_compressor_thrashing -- sync: failed to allocate jetsam reason\n");
- }
+ killtime = mach_absolute_time();
+ absolutetime_to_microtime(killtime, &tv_sec, &tv_usec);
+ tv_msec = tv_usec / 1000;
- return memorystatus_kill_process_sync(-1, kMemorystatusKilledVMCompressorThrashing, jetsam_reason);
- }
-}
+ memorystatus_update_jetsam_snapshot_entry_locked(p, cause, killtime);
-boolean_t
-memorystatus_kill_on_VM_page_shortage(boolean_t async)
-{
- if (async) {
- return memorystatus_kill_process_async(-1, kMemorystatusKilledVMPageShortage);
- } else {
- os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_VMPAGESHORTAGE);
- if (jetsam_reason == OS_REASON_NULL) {
- printf("memorystatus_kill_on_VM_page_shortage -- sync: failed to allocate jetsam reason\n");
- }
+ proc_list_unlock();
- return memorystatus_kill_process_sync(-1, kMemorystatusKilledVMPageShortage, jetsam_reason);
- }
+ killed = memorystatus_do_kill(p, cause, jetsam_reason, &footprint_of_killed_proc);
+
+ os_log_with_startup_serial(OS_LOG_DEFAULT, "%lu.%03d memorystatus: killing_specific_process pid %d [%s] (%s %d) %lluKB - memorystatus_available_pages: %llu\n",
+ (unsigned long)tv_sec, tv_msec, victim_pid, ((p && *p->p_name) ? p->p_name : "unknown"),
+ memorystatus_kill_cause_name[cause], (p ? p->p_memstat_effectivepriority: -1),
+ footprint_of_killed_proc >> 10, (uint64_t)MEMORYSTATUS_LOG_AVAILABLE_PAGES);
+
+ proc_rele(p);
+
+ return killed;
}
-boolean_t
-memorystatus_kill_on_FC_thrashing(boolean_t async)
+
+/*
+ * Toggle the P_MEMSTAT_TERMINATED state.
+ * Takes the proc_list_lock.
+ */
+void
+proc_memstat_terminated(proc_t p, boolean_t set)
{
- if (async) {
- return memorystatus_kill_process_async(-1, kMemorystatusKilledFCThrashing);
- } else {
- os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_FCTHRASHING);
- if (jetsam_reason == OS_REASON_NULL) {
- printf("memorystatus_kill_on_FC_thrashing -- sync: failed to allocate jetsam reason\n");
+#if DEVELOPMENT || DEBUG
+ if (p) {
+ proc_list_lock();
+ if (set == TRUE) {
+ p->p_memstat_state |= P_MEMSTAT_TERMINATED;
+ } else {
+ p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
}
-
- return memorystatus_kill_process_sync(-1, kMemorystatusKilledFCThrashing, jetsam_reason);
+ proc_list_unlock();
}
+#else
+#pragma unused(p, set)
+ /*
+ * do nothing
+ */
+#endif /* DEVELOPMENT || DEBUG */
+ return;
}
-boolean_t
-memorystatus_kill_on_vnode_limit(void)
+
+#if CONFIG_JETSAM
+/*
+ * This is invoked when cpulimits have been exceeded while in fatal mode.
+ * The jetsam_flags do not apply as those are for memory related kills.
+ * We call this routine so that the offending process is killed with
+ * a non-zero exit status.
+ */
+void
+jetsam_on_ledger_cpulimit_exceeded(void)
{
- os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_VNODE);
+ int retval = 0;
+ int jetsam_flags = 0; /* make it obvious */
+ proc_t p = current_proc();
+ os_reason_t jetsam_reason = OS_REASON_NULL;
+
+ printf("task_exceeded_cpulimit: killing pid %d [%s]\n",
+ p->p_pid, (*p->p_name ? p->p_name : "(unknown)"));
+
+ jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_CPULIMIT);
if (jetsam_reason == OS_REASON_NULL) {
- printf("memorystatus_kill_on_vnode_limit: failed to allocate jetsam reason\n");
+ printf("task_exceeded_cpulimit: unable to allocate memory for jetsam reason\n");
}
- return memorystatus_kill_process_sync(-1, kMemorystatusKilledVnodes, jetsam_reason);
+ retval = jetsam_do_kill(p, jetsam_flags, jetsam_reason);
+
+ if (retval) {
+ printf("task_exceeded_cpulimit: failed to kill current task (exiting?).\n");
+ }
}
#endif /* CONFIG_JETSAM */
-boolean_t
-memorystatus_kill_on_zone_map_exhaustion(pid_t pid)
+static void
+memorystatus_get_task_memory_region_count(task_t task, uint64_t *count)
{
- boolean_t res = FALSE;
- if (pid == -1) {
- res = memorystatus_kill_process_async(-1, kMemorystatusKilledZoneMapExhaustion);
- } else {
- os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_ZONE_MAP_EXHAUSTION);
- if (jetsam_reason == OS_REASON_NULL) {
- printf("memorystatus_kill_on_zone_map_exhaustion: failed to allocate jetsam reason\n");
- }
+ assert(task);
+ assert(count);
- res = memorystatus_kill_process_sync(pid, kMemorystatusKilledZoneMapExhaustion, jetsam_reason);
- }
- return res;
+ *count = get_task_memory_region_count(task);
}
-#if CONFIG_FREEZE
-__private_extern__ void
-memorystatus_freeze_init(void)
-{
- kern_return_t result;
- thread_t thread;
+#define MEMORYSTATUS_VM_MAP_FORK_ALLOWED 0x100000000
+#define MEMORYSTATUS_VM_MAP_FORK_NOT_ALLOWED 0x200000000
- freezer_lck_grp_attr = lck_grp_attr_alloc_init();
- freezer_lck_grp = lck_grp_alloc_init("freezer", freezer_lck_grp_attr);
+#if DEVELOPMENT || DEBUG
- lck_mtx_init(&freezer_mutex, freezer_lck_grp, NULL);
+/*
+ * Sysctl only used to test memorystatus_allowed_vm_map_fork() path.
+ * set a new pidwatch value
+ * or
+ * get the current pidwatch value
+ *
+ * The pidwatch_val starts out with a PID to watch for in the map_fork path.
+ * Its value is:
+ * - OR'd with MEMORYSTATUS_VM_MAP_FORK_ALLOWED if we allow the map_fork.
+ * - OR'd with MEMORYSTATUS_VM_MAP_FORK_NOT_ALLOWED if we disallow the map_fork.
+ * - set to -1ull if the map_fork() is aborted for other reasons.
+ */
- /*
- * This is just the default value if the underlying
- * storage device doesn't have any specific budget.
- * We check with the storage layer in memorystatus_freeze_update_throttle()
- * before we start our freezing the first time.
- */
- memorystatus_freeze_budget_pages_remaining = (memorystatus_freeze_daily_mb_max * 1024 * 1024) / PAGE_SIZE;
+uint64_t memorystatus_vm_map_fork_pidwatch_val = 0;
- result = kernel_thread_start(memorystatus_freeze_thread, NULL, &thread);
- if (result == KERN_SUCCESS) {
- proc_set_thread_policy(thread, TASK_POLICY_INTERNAL, TASK_POLICY_IO, THROTTLE_LEVEL_COMPRESSOR_TIER2);
- proc_set_thread_policy(thread, TASK_POLICY_INTERNAL, TASK_POLICY_PASSIVE_IO, TASK_POLICY_ENABLE);
- thread_set_thread_name(thread, "VM_freezer");
+static int sysctl_memorystatus_vm_map_fork_pidwatch SYSCTL_HANDLER_ARGS {
+#pragma unused(oidp, arg1, arg2)
- thread_deallocate(thread);
- } else {
- panic("Could not create memorystatus_freeze_thread");
- }
-}
+ uint64_t new_value = 0;
+ uint64_t old_value = 0;
+ int error = 0;
-static boolean_t
-memorystatus_is_process_eligible_for_freeze(proc_t p)
-{
/*
- * Called with proc_list_lock held.
+ * The pid is held in the low 32 bits.
+ * The 'allowed' flags are in the upper 32 bits.
*/
+ old_value = memorystatus_vm_map_fork_pidwatch_val;
- LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED);
-
- boolean_t should_freeze = FALSE;
- uint32_t state = 0, entry_count = 0, pages = 0, i = 0;
- int probability_of_use = 0;
+ error = sysctl_io_number(req, old_value, sizeof(old_value), &new_value, NULL);
- if (isApp(p) == FALSE) {
- goto out;
+ if (error || !req->newptr) {
+ /*
+ * No new value passed in.
+ */
+ return error;
}
- state = p->p_memstat_state;
-
- if ((state & (P_MEMSTAT_TERMINATED | P_MEMSTAT_LOCKED | P_MEMSTAT_FREEZE_DISABLED | P_MEMSTAT_FREEZE_IGNORE)) ||
- !(state & P_MEMSTAT_SUSPENDED)) {
- goto out;
- }
+ /*
+ * A new pid was passed in via req->newptr.
+ * Ignore any attempt to set the higher order bits.
+ */
+ memorystatus_vm_map_fork_pidwatch_val = new_value & 0xFFFFFFFF;
+ printf("memorystatus: pidwatch old_value = 0x%llx, new_value = 0x%llx \n", old_value, new_value);
- /* Only freeze processes meeting our minimum resident page criteria */
- memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL);
- if (pages < memorystatus_freeze_pages_min) {
- goto out;
- }
+ return error;
+}
- entry_count = (memorystatus_global_probabilities_size / sizeof(memorystatus_internal_probabilities_t));
+SYSCTL_PROC(_kern, OID_AUTO, memorystatus_vm_map_fork_pidwatch, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_MASKED,
+ 0, 0, sysctl_memorystatus_vm_map_fork_pidwatch, "Q", "get/set pid watched for in vm_map_fork");
- if (entry_count) {
- for (i = 0; i < entry_count; i++) {
- if (strncmp(memorystatus_global_probabilities_table[i].proc_name,
- p->p_name,
- MAXCOMLEN + 1) == 0) {
- probability_of_use = memorystatus_global_probabilities_table[i].use_probability;
- break;
- }
+
+/*
+ * Record if a watched process fails to qualify for a vm_map_fork().
+ */
+void
+memorystatus_abort_vm_map_fork(task_t task)
+{
+ if (memorystatus_vm_map_fork_pidwatch_val != 0) {
+ proc_t p = get_bsdtask_info(task);
+ if (p != NULL && memorystatus_vm_map_fork_pidwatch_val == (uint64_t)p->p_pid) {
+ memorystatus_vm_map_fork_pidwatch_val = -1ull;
}
+ }
+}
- if (probability_of_use == 0) {
- goto out;
+static void
+set_vm_map_fork_pidwatch(task_t task, uint64_t x)
+{
+ if (memorystatus_vm_map_fork_pidwatch_val != 0) {
+ proc_t p = get_bsdtask_info(task);
+ if (p && (memorystatus_vm_map_fork_pidwatch_val == (uint64_t)p->p_pid)) {
+ memorystatus_vm_map_fork_pidwatch_val |= x;
}
}
+}
- should_freeze = TRUE;
-out:
- return should_freeze;
+#else /* DEVELOPMENT || DEBUG */
+
+
+static void
+set_vm_map_fork_pidwatch(task_t task, uint64_t x)
+{
+#pragma unused(task)
+#pragma unused(x)
}
+#endif /* DEVELOPMENT || DEBUG */
+
/*
- * Synchronously freeze the passed proc. Called with a reference to the proc held.
+ * Called during EXC_RESOURCE handling when a process exceeds a soft
+ * memory limit. This is the corpse fork path and here we decide if
+ * vm_map_fork will be allowed when creating the corpse.
+ * The task being considered is suspended.
+ *
+ * By default, a vm_map_fork is allowed to proceed.
*
- * Doesn't deal with re-freezing because this is called on a specific process and
- * not by the freezer thread. If that changes, we'll have to teach it about
- * refreezing a frozen process.
+ * A few simple policy assumptions:
+ * If the device has a zero system-wide task limit,
+ * then the vm_map_fork is allowed. macOS always has a zero
+ * system wide task limit (unless overriden by a boot-arg).
*
- * Returns EINVAL or the value returned by task_freeze().
+ * And if a process's memory footprint calculates less
+ * than or equal to quarter of the system-wide task limit,
+ * then the vm_map_fork is allowed. This calculation
+ * is based on the assumption that a process can
+ * munch memory up to the system-wide task limit.
*/
-int
-memorystatus_freeze_process_sync(proc_t p)
+extern boolean_t corpse_threshold_system_limit;
+boolean_t
+memorystatus_allowed_vm_map_fork(task_t task)
{
- int ret = EINVAL;
- pid_t aPid = 0;
- boolean_t memorystatus_freeze_swap_low = FALSE;
- int freezer_error_code = 0;
+ boolean_t is_allowed = TRUE; /* default */
- lck_mtx_lock(&freezer_mutex);
+ uint64_t footprint_in_bytes;
+ uint64_t max_allowed_bytes;
- if (p == NULL) {
- printf("memorystatus_freeze_process_sync: Invalid process\n");
- goto exit;
+ if (max_task_footprint_mb == 0) {
+ set_vm_map_fork_pidwatch(task, MEMORYSTATUS_VM_MAP_FORK_ALLOWED);
+ return is_allowed;
}
- if (memorystatus_freeze_enabled == FALSE) {
- printf("memorystatus_freeze_process_sync: Freezing is DISABLED\n");
- goto exit;
- }
+ footprint_in_bytes = get_task_phys_footprint(task);
- if (!memorystatus_can_freeze(&memorystatus_freeze_swap_low)) {
- printf("memorystatus_freeze_process_sync: Low compressor and/or low swap space...skipping freeze\n");
- goto exit;
- }
+ /*
+ * Maximum is 1/4 of the system-wide task limit by default.
+ */
+ max_allowed_bytes = ((uint64_t)max_task_footprint_mb * 1024 * 1024) >> 2;
- memorystatus_freeze_update_throttle(&memorystatus_freeze_budget_pages_remaining);
- if (!memorystatus_freeze_budget_pages_remaining) {
- printf("memorystatus_freeze_process_sync: exit with NO available budget\n");
- goto exit;
+#if DEBUG || DEVELOPMENT
+ if (corpse_threshold_system_limit) {
+ max_allowed_bytes = (uint64_t)max_task_footprint_mb * (1UL << 20);
}
+#endif /* DEBUG || DEVELOPMENT */
- proc_list_lock();
-
- if (p != NULL) {
- uint32_t purgeable, wired, clean, dirty, shared;
- uint32_t max_pages, i;
-
- aPid = p->p_pid;
-
- /* Ensure the process is eligible for freezing */
- if (memorystatus_is_process_eligible_for_freeze(p) == FALSE) {
- proc_list_unlock();
- goto exit;
- }
-
- if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
- max_pages = MIN(memorystatus_freeze_pages_max, memorystatus_freeze_budget_pages_remaining);
- } else {
- /*
- * We only have the compressor without any swap.
- */
- max_pages = UINT32_MAX - 1;
- }
-
- /* Mark as locked temporarily to avoid kill */
- p->p_memstat_state |= P_MEMSTAT_LOCKED;
- proc_list_unlock();
-
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_FREEZE) | DBG_FUNC_START,
- memorystatus_available_pages, 0, 0, 0, 0);
-
- ret = task_freeze(p->task, &purgeable, &wired, &clean, &dirty, max_pages, &shared, &freezer_error_code, FALSE /* eval only */);
-
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_FREEZE) | DBG_FUNC_END,
- memorystatus_available_pages, aPid, 0, 0, 0);
-
- DTRACE_MEMORYSTATUS6(memorystatus_freeze, proc_t, p, unsigned int, memorystatus_available_pages, boolean_t, purgeable, unsigned int, wired, uint32_t, clean, uint32_t, dirty);
-
- MEMORYSTATUS_DEBUG(1, "memorystatus_freeze_process_sync: task_freeze %s for pid %d [%s] - "
- "memorystatus_pages: %d, purgeable: %d, wired: %d, clean: %d, dirty: %d, max_pages %d, shared %d\n",
- (ret == KERN_SUCCESS) ? "SUCCEEDED" : "FAILED", aPid, (*p->p_name ? p->p_name : "(unknown)"),
- memorystatus_available_pages, purgeable, wired, clean, dirty, max_pages, shared);
+ if (footprint_in_bytes > max_allowed_bytes) {
+ printf("memorystatus disallowed vm_map_fork %lld %lld\n", footprint_in_bytes, max_allowed_bytes);
+ set_vm_map_fork_pidwatch(task, MEMORYSTATUS_VM_MAP_FORK_NOT_ALLOWED);
+ return !is_allowed;
+ }
- proc_list_lock();
+ set_vm_map_fork_pidwatch(task, MEMORYSTATUS_VM_MAP_FORK_ALLOWED);
+ return is_allowed;
+}
- if (ret == KERN_SUCCESS) {
- os_log_with_startup_serial(OS_LOG_DEFAULT, "memorystatus: freezing (specific) pid %d [%s]...done",
- aPid, (*p->p_name ? p->p_name : "unknown"));
+void
+memorystatus_get_task_page_counts(task_t task, uint32_t *footprint, uint32_t *max_footprint_lifetime, uint32_t *purgeable_pages)
+{
+ assert(task);
+ assert(footprint);
- memorystatus_freeze_entry_t data = { aPid, TRUE, dirty };
+ uint64_t pages;
- p->p_memstat_freeze_sharedanon_pages += shared;
+ pages = (get_task_phys_footprint(task) / PAGE_SIZE_64);
+ assert(((uint32_t)pages) == pages);
+ *footprint = (uint32_t)pages;
- memorystatus_frozen_shared_mb += shared;
+ if (max_footprint_lifetime) {
+ pages = (get_task_phys_footprint_lifetime_max(task) / PAGE_SIZE_64);
+ assert(((uint32_t)pages) == pages);
+ *max_footprint_lifetime = (uint32_t)pages;
+ }
+ if (purgeable_pages) {
+ pages = (get_task_purgeable_size(task) / PAGE_SIZE_64);
+ assert(((uint32_t)pages) == pages);
+ *purgeable_pages = (uint32_t)pages;
+ }
+}
- if ((p->p_memstat_state & P_MEMSTAT_FROZEN) == 0) {
- p->p_memstat_state |= P_MEMSTAT_FROZEN;
- memorystatus_frozen_count++;
- }
+static void
+memorystatus_get_task_phys_footprint_page_counts(task_t task,
+ uint64_t *internal_pages, uint64_t *internal_compressed_pages,
+ uint64_t *purgeable_nonvolatile_pages, uint64_t *purgeable_nonvolatile_compressed_pages,
+ uint64_t *alternate_accounting_pages, uint64_t *alternate_accounting_compressed_pages,
+ uint64_t *iokit_mapped_pages, uint64_t *page_table_pages, uint64_t *frozen_to_swap_pages)
+{
+ assert(task);
- p->p_memstat_frozen_count++;
+ if (internal_pages) {
+ *internal_pages = (get_task_internal(task) / PAGE_SIZE_64);
+ }
- /*
- * Still keeping the P_MEMSTAT_LOCKED bit till we are actually done elevating this frozen process
- * to its higher jetsam band.
- */
- proc_list_unlock();
+ if (internal_compressed_pages) {
+ *internal_compressed_pages = (get_task_internal_compressed(task) / PAGE_SIZE_64);
+ }
- memorystatus_send_note(kMemorystatusFreezeNote, &data, sizeof(data));
+ if (purgeable_nonvolatile_pages) {
+ *purgeable_nonvolatile_pages = (get_task_purgeable_nonvolatile(task) / PAGE_SIZE_64);
+ }
- if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
- ret = memorystatus_update_inactive_jetsam_priority_band(p->p_pid, MEMORYSTATUS_CMD_ELEVATED_INACTIVEJETSAMPRIORITY_ENABLE,
- memorystatus_freeze_jetsam_band, TRUE);
+ if (purgeable_nonvolatile_compressed_pages) {
+ *purgeable_nonvolatile_compressed_pages = (get_task_purgeable_nonvolatile_compressed(task) / PAGE_SIZE_64);
+ }
- if (ret) {
- printf("Elevating the frozen process failed with %d\n", ret);
- /* not fatal */
- ret = 0;
- }
+ if (alternate_accounting_pages) {
+ *alternate_accounting_pages = (get_task_alternate_accounting(task) / PAGE_SIZE_64);
+ }
- proc_list_lock();
+ if (alternate_accounting_compressed_pages) {
+ *alternate_accounting_compressed_pages = (get_task_alternate_accounting_compressed(task) / PAGE_SIZE_64);
+ }
- /* Update stats */
- for (i = 0; i < sizeof(throttle_intervals) / sizeof(struct throttle_interval_t); i++) {
- throttle_intervals[i].pageouts += dirty;
- }
- } else {
- proc_list_lock();
- }
+ if (iokit_mapped_pages) {
+ *iokit_mapped_pages = (get_task_iokit_mapped(task) / PAGE_SIZE_64);
+ }
- memorystatus_freeze_pageouts += dirty;
+ if (page_table_pages) {
+ *page_table_pages = (get_task_page_table(task) / PAGE_SIZE_64);
+ }
- if (memorystatus_frozen_count == (memorystatus_frozen_processes_max - 1)) {
- /*
- * Add some eviction logic here? At some point should we
- * jetsam a process to get back its swap space so that we
- * can freeze a more eligible process at this moment in time?
- */
- }
- } else {
- char reason[128];
- if (freezer_error_code == FREEZER_ERROR_EXCESS_SHARED_MEMORY) {
- strlcpy(reason, "too much shared memory", 128);
- }
+#if CONFIG_FREEZE
+ if (frozen_to_swap_pages) {
+ *frozen_to_swap_pages = (get_task_frozen_to_swap(task) / PAGE_SIZE_64);
+ }
+#else /* CONFIG_FREEZE */
+#pragma unused(frozen_to_swap_pages)
+#endif /* CONFIG_FREEZE */
+}
- if (freezer_error_code == FREEZER_ERROR_LOW_PRIVATE_SHARED_RATIO) {
- strlcpy(reason, "low private-shared pages ratio", 128);
- }
+#if CONFIG_FREEZE
+/*
+ * Copies the source entry into the destination snapshot.
+ * Returns true on success. Fails if the destination snapshot is full.
+ * Caller must hold the proc list lock.
+ */
+static bool
+memorystatus_jetsam_snapshot_copy_entry_locked(memorystatus_jetsam_snapshot_t *dst_snapshot, unsigned int dst_snapshot_size, const memorystatus_jetsam_snapshot_entry_t *src_entry)
+{
+ LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED);
+ assert(dst_snapshot);
- if (freezer_error_code == FREEZER_ERROR_NO_COMPRESSOR_SPACE) {
- strlcpy(reason, "no compressor space", 128);
- }
+ if (dst_snapshot->entry_count == dst_snapshot_size) {
+ /* Destination snapshot is full. Can not be updated until it is consumed. */
+ return false;
+ }
+ if (dst_snapshot->entry_count == 0) {
+ memorystatus_init_jetsam_snapshot_header(dst_snapshot);
+ }
+ memorystatus_jetsam_snapshot_entry_t *dst_entry = &dst_snapshot->entries[dst_snapshot->entry_count++];
+ memcpy(dst_entry, src_entry, sizeof(memorystatus_jetsam_snapshot_entry_t));
+ return true;
+}
+#endif /* CONFIG_FREEZE */
- if (freezer_error_code == FREEZER_ERROR_NO_SWAP_SPACE) {
- strlcpy(reason, "no swap space", 128);
- }
+static bool
+memorystatus_init_jetsam_snapshot_entry_with_kill_locked(memorystatus_jetsam_snapshot_t *snapshot, proc_t p, uint32_t kill_cause, uint64_t killtime, memorystatus_jetsam_snapshot_entry_t **entry)
+{
+ LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED);
+ memorystatus_jetsam_snapshot_entry_t *snapshot_list = snapshot->entries;
+ size_t i = snapshot->entry_count;
- os_log_with_startup_serial(OS_LOG_DEFAULT, "memorystatus: freezing (specific) pid %d [%s]...skipped (%s)",
- aPid, (*p->p_name ? p->p_name : "unknown"), reason);
- p->p_memstat_state |= P_MEMSTAT_FREEZE_IGNORE;
- }
+ if (memorystatus_init_jetsam_snapshot_entry_locked(p, &snapshot_list[i], (snapshot->js_gencount)) == TRUE) {
+ *entry = &snapshot_list[i];
+ (*entry)->killed = kill_cause;
+ (*entry)->jse_killtime = killtime;
- p->p_memstat_state &= ~P_MEMSTAT_LOCKED;
- proc_list_unlock();
+ snapshot->entry_count = i + 1;
+ return true;
}
-
-exit:
- lck_mtx_unlock(&freezer_mutex);
-
- return ret;
+ return false;
}
-static int
-memorystatus_freeze_top_process(void)
+/*
+ * This routine only acts on the global jetsam event snapshot.
+ * Updating the process's entry can race when the memorystatus_thread
+ * has chosen to kill a process that is racing to exit on another core.
+ */
+static void
+memorystatus_update_jetsam_snapshot_entry_locked(proc_t p, uint32_t kill_cause, uint64_t killtime)
{
- pid_t aPid = 0;
- int ret = -1;
- proc_t p = PROC_NULL, next_p = PROC_NULL;
- unsigned int i = 0;
- unsigned int band = JETSAM_PRIORITY_IDLE;
- boolean_t refreeze_processes = FALSE;
+ memorystatus_jetsam_snapshot_entry_t *entry = NULL;
+ memorystatus_jetsam_snapshot_t *snapshot = NULL;
+ memorystatus_jetsam_snapshot_entry_t *snapshot_list = NULL;
- proc_list_lock();
+ unsigned int i;
+#if CONFIG_FREEZE
+ bool copied_to_freezer_snapshot = false;
+#endif /* CONFIG_FREEZE */
+
+ LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED);
- if (memorystatus_frozen_count >= memorystatus_frozen_processes_max) {
+ if (memorystatus_jetsam_snapshot_count == 0) {
/*
- * Freezer is already full but we are here and so let's
- * try to refreeze any processes we might have thawed
- * in the past and push out their compressed state out.
+ * No active snapshot.
+ * Nothing to do.
*/
- refreeze_processes = TRUE;
- band = (unsigned int) memorystatus_freeze_jetsam_band;
+ goto exit;
}
-freeze_process:
-
- next_p = memorystatus_get_first_proc_locked(&band, FALSE);
- while (next_p) {
- kern_return_t kr;
- uint32_t purgeable, wired, clean, dirty, shared;
- uint32_t max_pages = 0;
- int freezer_error_code = 0;
-
- p = next_p;
- next_p = memorystatus_get_next_proc_locked(&band, p, FALSE);
+ /*
+ * Sanity check as this routine should only be called
+ * from a jetsam kill path.
+ */
+ assert(kill_cause != 0 && killtime != 0);
- aPid = p->p_pid;
+ snapshot = memorystatus_jetsam_snapshot;
+ snapshot_list = memorystatus_jetsam_snapshot->entries;
- if (p->p_memstat_effectivepriority != (int32_t) band) {
- /*
- * We shouldn't be freezing processes outside the
- * prescribed band.
- */
- break;
- }
+ for (i = 0; i < memorystatus_jetsam_snapshot_count; i++) {
+ if (snapshot_list[i].pid == p->p_pid) {
+ entry = &snapshot_list[i];
- /* Ensure the process is eligible for (re-)freezing */
- if (refreeze_processes) {
- /*
- * Has to have been frozen once before.
- */
- if ((p->p_memstat_state & P_MEMSTAT_FROZEN) == FALSE) {
- continue;
+ if (entry->killed || entry->jse_killtime) {
+ /*
+ * We apparently raced on the exit path
+ * for this process, as it's snapshot entry
+ * has already recorded a kill.
+ */
+ assert(entry->killed && entry->jse_killtime);
+ break;
}
/*
- * Has to have been resumed once before.
+ * Update the entry we just found in the snapshot.
*/
- if ((p->p_memstat_state & P_MEMSTAT_REFREEZE_ELIGIBLE) == FALSE) {
- continue;
- }
- /*
- * Not currently being looked at for something.
- */
- if (p->p_memstat_state & P_MEMSTAT_LOCKED) {
- continue;
- }
+ entry->killed = kill_cause;
+ entry->jse_killtime = killtime;
+ entry->jse_gencount = snapshot->js_gencount;
+ entry->jse_idle_delta = p->p_memstat_idle_delta;
+#if CONFIG_FREEZE
+ entry->jse_thaw_count = p->p_memstat_thaw_count;
+ entry->jse_freeze_skip_reason = p->p_memstat_freeze_skip_reason;
+#else /* CONFIG_FREEZE */
+ entry->jse_thaw_count = 0;
+ entry->jse_freeze_skip_reason = kMemorystatusFreezeSkipReasonNone;
+#endif /* CONFIG_FREEZE */
/*
- * We are going to try and refreeze and so re-evaluate
- * the process. We don't want to double count the shared
- * memory. So deduct the old snapshot here.
+ * If a process has moved between bands since snapshot was
+ * initialized, then likely these fields changed too.
*/
- memorystatus_frozen_shared_mb -= p->p_memstat_freeze_sharedanon_pages;
- p->p_memstat_freeze_sharedanon_pages = 0;
-
- p->p_memstat_state &= ~P_MEMSTAT_REFREEZE_ELIGIBLE;
- memorystatus_refreeze_eligible_count--;
- } else {
- if (memorystatus_is_process_eligible_for_freeze(p) == FALSE) {
- continue; // with lock held
+ if (entry->priority != p->p_memstat_effectivepriority) {
+ strlcpy(entry->name, p->p_name, sizeof(entry->name));
+ entry->priority = p->p_memstat_effectivepriority;
+ entry->state = memorystatus_build_state(p);
+ entry->user_data = p->p_memstat_userdata;
+ entry->fds = p->p_fd->fd_nfiles;
}
- }
- if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
/*
- * Freezer backed by the compressor and swap file(s)
- * will hold compressed data.
+ * Always update the page counts on a kill.
*/
- max_pages = MIN(memorystatus_freeze_pages_max, memorystatus_freeze_budget_pages_remaining);
- } else {
- /*
- * We only have the compressor pool.
- */
- max_pages = UINT32_MAX - 1;
- }
+ uint32_t pages = 0;
+ uint32_t max_pages_lifetime = 0;
+ uint32_t purgeable_pages = 0;
- /* Mark as locked temporarily to avoid kill */
- p->p_memstat_state |= P_MEMSTAT_LOCKED;
+ memorystatus_get_task_page_counts(p->task, &pages, &max_pages_lifetime, &purgeable_pages);
+ entry->pages = (uint64_t)pages;
+ entry->max_pages_lifetime = (uint64_t)max_pages_lifetime;
+ entry->purgeable_pages = (uint64_t)purgeable_pages;
- p = proc_ref_locked(p);
- if (!p) {
- break;
- }
+ uint64_t internal_pages = 0;
+ uint64_t internal_compressed_pages = 0;
+ uint64_t purgeable_nonvolatile_pages = 0;
+ uint64_t purgeable_nonvolatile_compressed_pages = 0;
+ uint64_t alternate_accounting_pages = 0;
+ uint64_t alternate_accounting_compressed_pages = 0;
+ uint64_t iokit_mapped_pages = 0;
+ uint64_t page_table_pages = 0;
+ uint64_t frozen_to_swap_pages = 0;
- proc_list_unlock();
+ memorystatus_get_task_phys_footprint_page_counts(p->task, &internal_pages, &internal_compressed_pages,
+ &purgeable_nonvolatile_pages, &purgeable_nonvolatile_compressed_pages,
+ &alternate_accounting_pages, &alternate_accounting_compressed_pages,
+ &iokit_mapped_pages, &page_table_pages, &frozen_to_swap_pages);
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_FREEZE) | DBG_FUNC_START,
- memorystatus_available_pages, 0, 0, 0, 0);
+ entry->jse_internal_pages = internal_pages;
+ entry->jse_internal_compressed_pages = internal_compressed_pages;
+ entry->jse_purgeable_nonvolatile_pages = purgeable_nonvolatile_pages;
+ entry->jse_purgeable_nonvolatile_compressed_pages = purgeable_nonvolatile_compressed_pages;
+ entry->jse_alternate_accounting_pages = alternate_accounting_pages;
+ entry->jse_alternate_accounting_compressed_pages = alternate_accounting_compressed_pages;
+ entry->jse_iokit_mapped_pages = iokit_mapped_pages;
+ entry->jse_page_table_pages = page_table_pages;
+ entry->jse_frozen_to_swap_pages = frozen_to_swap_pages;
- kr = task_freeze(p->task, &purgeable, &wired, &clean, &dirty, max_pages, &shared, &freezer_error_code, FALSE /* eval only */);
+ uint64_t region_count = 0;
+ memorystatus_get_task_memory_region_count(p->task, ®ion_count);
+ entry->jse_memory_region_count = region_count;
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_FREEZE) | DBG_FUNC_END,
- memorystatus_available_pages, aPid, 0, 0, 0);
+ goto exit;
+ }
+ }
- MEMORYSTATUS_DEBUG(1, "memorystatus_freeze_top_process: task_freeze %s for pid %d [%s] - "
- "memorystatus_pages: %d, purgeable: %d, wired: %d, clean: %d, dirty: %d, max_pages %d, shared %d\n",
- (kr == KERN_SUCCESS) ? "SUCCEEDED" : "FAILED", aPid, (*p->p_name ? p->p_name : "(unknown)"),
- memorystatus_available_pages, purgeable, wired, clean, dirty, max_pages, shared);
+ if (entry == NULL) {
+ /*
+ * The entry was not found in the snapshot, so the process must have
+ * launched after the snapshot was initialized.
+ * Let's try to append the new entry.
+ */
+ if (memorystatus_jetsam_snapshot_count < memorystatus_jetsam_snapshot_max) {
+ /*
+ * A populated snapshot buffer exists
+ * and there is room to init a new entry.
+ */
+ assert(memorystatus_jetsam_snapshot_count == snapshot->entry_count);
- proc_list_lock();
+ if (memorystatus_init_jetsam_snapshot_entry_with_kill_locked(snapshot, p, kill_cause, killtime, &entry)) {
+ memorystatus_jetsam_snapshot_count++;
- /* Success? */
- if (KERN_SUCCESS == kr) {
- if (refreeze_processes) {
- os_log_with_startup_serial(OS_LOG_DEFAULT, "memorystatus: Refreezing (general) pid %d [%s]...done",
- aPid, (*p->p_name ? p->p_name : "unknown"));
- } else {
- os_log_with_startup_serial(OS_LOG_DEFAULT, "memorystatus: freezing (general) pid %d [%s]...done",
- aPid, (*p->p_name ? p->p_name : "unknown"));
+ if (memorystatus_jetsam_snapshot_count >= memorystatus_jetsam_snapshot_max) {
+ /*
+ * We just used the last slot in the snapshot buffer.
+ * We only want to log it once... so we do it here
+ * when we notice we've hit the max.
+ */
+ printf("memorystatus: WARNING snapshot buffer is full, count %d\n",
+ memorystatus_jetsam_snapshot_count);
+ }
}
+ }
+ }
- memorystatus_freeze_entry_t data = { aPid, TRUE, dirty };
-
- p->p_memstat_freeze_sharedanon_pages += shared;
+exit:
+ if (entry) {
+#if CONFIG_FREEZE
+ if (memorystatus_jetsam_use_freezer_snapshot && isApp(p)) {
+ /* This is an app kill. Record it in the freezer snapshot so dasd can incorporate this in its recommendations. */
+ copied_to_freezer_snapshot = memorystatus_jetsam_snapshot_copy_entry_locked(memorystatus_jetsam_snapshot_freezer, memorystatus_jetsam_snapshot_freezer_max, entry);
+ if (copied_to_freezer_snapshot && memorystatus_jetsam_snapshot_freezer->entry_count == memorystatus_jetsam_snapshot_freezer_max) {
+ /*
+ * We just used the last slot in the freezer snapshot buffer.
+ * We only want to log it once... so we do it here
+ * when we notice we've hit the max.
+ */
+ os_log_error(OS_LOG_DEFAULT, "memorystatus: WARNING freezer snapshot buffer is full, count %zu",
+ memorystatus_jetsam_snapshot_freezer->entry_count);
+ }
+ }
+#endif /* CONFIG_FREEZE */
+ } else {
+ /*
+ * If we reach here, the snapshot buffer could not be updated.
+ * Most likely, the buffer is full, in which case we would have
+ * logged a warning in the previous call.
+ *
+ * For now, we will stop appending snapshot entries.
+ * When the buffer is consumed, the snapshot state will reset.
+ */
- memorystatus_frozen_shared_mb += shared;
+ MEMORYSTATUS_DEBUG(4, "memorystatus_update_jetsam_snapshot_entry_locked: failed to update pid %d, priority %d, count %d\n",
+ p->p_pid, p->p_memstat_effectivepriority, memorystatus_jetsam_snapshot_count);
- if ((p->p_memstat_state & P_MEMSTAT_FROZEN) == 0) {
- p->p_memstat_state |= P_MEMSTAT_FROZEN;
- memorystatus_frozen_count++;
+#if CONFIG_FREEZE
+ /* We still attempt to record this in the freezer snapshot */
+ if (memorystatus_jetsam_use_freezer_snapshot && isApp(p)) {
+ snapshot = memorystatus_jetsam_snapshot_freezer;
+ if (snapshot->entry_count < memorystatus_jetsam_snapshot_freezer_max) {
+ copied_to_freezer_snapshot = memorystatus_init_jetsam_snapshot_entry_with_kill_locked(snapshot, p, kill_cause, killtime, &entry);
+ if (copied_to_freezer_snapshot && memorystatus_jetsam_snapshot_freezer->entry_count == memorystatus_jetsam_snapshot_freezer_max) {
+ /*
+ * We just used the last slot in the freezer snapshot buffer.
+ * We only want to log it once... so we do it here
+ * when we notice we've hit the max.
+ */
+ os_log_error(OS_LOG_DEFAULT, "memorystatus: WARNING freezer snapshot buffer is full, count %zu",
+ memorystatus_jetsam_snapshot_freezer->entry_count);
+ }
}
+ }
+#endif /* CONFIG_FREEZE */
+ }
- p->p_memstat_frozen_count++;
+ return;
+}
- /*
- * Still keeping the P_MEMSTAT_LOCKED bit till we are actually done elevating this frozen process
- * to its higher jetsam band.
- */
- proc_list_unlock();
+#if CONFIG_JETSAM
+void
+memorystatus_pages_update(unsigned int pages_avail)
+{
+ memorystatus_available_pages = pages_avail;
- memorystatus_send_note(kMemorystatusFreezeNote, &data, sizeof(data));
+#if VM_PRESSURE_EVENTS
+ /*
+ * Since memorystatus_available_pages changes, we should
+ * re-evaluate the pressure levels on the system and
+ * check if we need to wake the pressure thread.
+ * We also update memorystatus_level in that routine.
+ */
+ vm_pressure_response();
- if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
- ret = memorystatus_update_inactive_jetsam_priority_band(p->p_pid, MEMORYSTATUS_CMD_ELEVATED_INACTIVEJETSAMPRIORITY_ENABLE, memorystatus_freeze_jetsam_band, TRUE);
+ if (memorystatus_available_pages <= memorystatus_available_pages_pressure) {
+ if (memorystatus_hwm_candidates || (memorystatus_available_pages <= memorystatus_available_pages_critical)) {
+ memorystatus_thread_wake();
+ }
+ }
+#if CONFIG_FREEZE
+ /*
+ * We can't grab the freezer_mutex here even though that synchronization would be correct to inspect
+ * the # of frozen processes and wakeup the freezer thread. Reason being that we come here into this
+ * code with (possibly) the page-queue locks held and preemption disabled. So trying to grab a mutex here
+ * will result in the "mutex with preemption disabled" panic.
+ */
- if (ret) {
- printf("Elevating the frozen process failed with %d\n", ret);
- /* not fatal */
- ret = 0;
- }
+ if (memorystatus_freeze_thread_should_run() == TRUE) {
+ /*
+ * The freezer thread is usually woken up by some user-space call i.e. pid_hibernate(any process).
+ * That trigger isn't invoked often enough and so we are enabling this explicit wakeup here.
+ */
+ if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
+ thread_wakeup((event_t)&memorystatus_freeze_wakeup);
+ }
+ }
+#endif /* CONFIG_FREEZE */
- proc_list_lock();
+#else /* VM_PRESSURE_EVENTS */
- /* Update stats */
- for (i = 0; i < sizeof(throttle_intervals) / sizeof(struct throttle_interval_t); i++) {
- throttle_intervals[i].pageouts += dirty;
- }
- } else {
- proc_list_lock();
- }
+ boolean_t critical, delta;
- memorystatus_freeze_pageouts += dirty;
+ if (!memorystatus_delta) {
+ return;
+ }
- if (memorystatus_frozen_count == (memorystatus_frozen_processes_max - 1)) {
- /*
- * Add some eviction logic here? At some point should we
- * jetsam a process to get back its swap space so that we
- * can freeze a more eligible process at this moment in time?
- */
- }
+ critical = (pages_avail < memorystatus_available_pages_critical) ? TRUE : FALSE;
+ delta = ((pages_avail >= (memorystatus_available_pages + memorystatus_delta))
+ || (memorystatus_available_pages >= (pages_avail + memorystatus_delta))) ? TRUE : FALSE;
- /* Return KERN_SUCCESS */
- ret = kr;
+ if (critical || delta) {
+ unsigned int total_pages;
- p->p_memstat_state &= ~P_MEMSTAT_LOCKED;
- proc_rele_locked(p);
+ total_pages = (unsigned int) atop_64(max_mem);
+#if CONFIG_SECLUDED_MEMORY
+ total_pages -= vm_page_secluded_count;
+#endif /* CONFIG_SECLUDED_MEMORY */
+ memorystatus_level = memorystatus_available_pages * 100 / total_pages;
+ memorystatus_thread_wake();
+ }
+#endif /* VM_PRESSURE_EVENTS */
+}
+#endif /* CONFIG_JETSAM */
- /*
- * We froze a process successfully. We can stop now
- * and see if that helped.
- */
+static boolean_t
+memorystatus_init_jetsam_snapshot_entry_locked(proc_t p, memorystatus_jetsam_snapshot_entry_t *entry, uint64_t gencount)
+{
+ clock_sec_t tv_sec;
+ clock_usec_t tv_usec;
+ uint32_t pages = 0;
+ uint32_t max_pages_lifetime = 0;
+ uint32_t purgeable_pages = 0;
+ uint64_t internal_pages = 0;
+ uint64_t internal_compressed_pages = 0;
+ uint64_t purgeable_nonvolatile_pages = 0;
+ uint64_t purgeable_nonvolatile_compressed_pages = 0;
+ uint64_t alternate_accounting_pages = 0;
+ uint64_t alternate_accounting_compressed_pages = 0;
+ uint64_t iokit_mapped_pages = 0;
+ uint64_t page_table_pages = 0;
+ uint64_t frozen_to_swap_pages = 0;
+ uint64_t region_count = 0;
+ uint64_t cids[COALITION_NUM_TYPES];
- break;
- } else {
- p->p_memstat_state &= ~P_MEMSTAT_LOCKED;
+ memset(entry, 0, sizeof(memorystatus_jetsam_snapshot_entry_t));
- if (refreeze_processes == TRUE) {
- if ((freezer_error_code == FREEZER_ERROR_EXCESS_SHARED_MEMORY) ||
- (freezer_error_code == FREEZER_ERROR_LOW_PRIVATE_SHARED_RATIO)) {
- /*
- * Keeping this prior-frozen process in this high band when
- * we failed to re-freeze it due to bad shared memory usage
- * could cause excessive pressure on the lower bands.
- * We need to demote it for now. It'll get re-evaluated next
- * time because we don't set the P_MEMSTAT_FREEZE_IGNORE
- * bit.
- */
+ entry->pid = p->p_pid;
+ strlcpy(&entry->name[0], p->p_name, sizeof(entry->name));
+ entry->priority = p->p_memstat_effectivepriority;
- p->p_memstat_state &= ~P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND;
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
- memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, TRUE, TRUE);
- }
- } else {
- p->p_memstat_state |= P_MEMSTAT_FREEZE_IGNORE;
- }
+ memorystatus_get_task_page_counts(p->task, &pages, &max_pages_lifetime, &purgeable_pages);
+ entry->pages = (uint64_t)pages;
+ entry->max_pages_lifetime = (uint64_t)max_pages_lifetime;
+ entry->purgeable_pages = (uint64_t)purgeable_pages;
- proc_rele_locked(p);
+ memorystatus_get_task_phys_footprint_page_counts(p->task, &internal_pages, &internal_compressed_pages,
+ &purgeable_nonvolatile_pages, &purgeable_nonvolatile_compressed_pages,
+ &alternate_accounting_pages, &alternate_accounting_compressed_pages,
+ &iokit_mapped_pages, &page_table_pages, &frozen_to_swap_pages);
- char reason[128];
- if (freezer_error_code == FREEZER_ERROR_EXCESS_SHARED_MEMORY) {
- strlcpy(reason, "too much shared memory", 128);
- }
+ entry->jse_internal_pages = internal_pages;
+ entry->jse_internal_compressed_pages = internal_compressed_pages;
+ entry->jse_purgeable_nonvolatile_pages = purgeable_nonvolatile_pages;
+ entry->jse_purgeable_nonvolatile_compressed_pages = purgeable_nonvolatile_compressed_pages;
+ entry->jse_alternate_accounting_pages = alternate_accounting_pages;
+ entry->jse_alternate_accounting_compressed_pages = alternate_accounting_compressed_pages;
+ entry->jse_iokit_mapped_pages = iokit_mapped_pages;
+ entry->jse_page_table_pages = page_table_pages;
+ entry->jse_frozen_to_swap_pages = frozen_to_swap_pages;
- if (freezer_error_code == FREEZER_ERROR_LOW_PRIVATE_SHARED_RATIO) {
- strlcpy(reason, "low private-shared pages ratio", 128);
- }
+ memorystatus_get_task_memory_region_count(p->task, ®ion_count);
+ entry->jse_memory_region_count = region_count;
+
+ entry->state = memorystatus_build_state(p);
+ entry->user_data = p->p_memstat_userdata;
+ memcpy(&entry->uuid[0], &p->p_uuid[0], sizeof(p->p_uuid));
+ entry->fds = p->p_fd->fd_nfiles;
+
+ absolutetime_to_microtime(get_task_cpu_time(p->task), &tv_sec, &tv_usec);
+ entry->cpu_time.tv_sec = (int64_t)tv_sec;
+ entry->cpu_time.tv_usec = (int64_t)tv_usec;
- if (freezer_error_code == FREEZER_ERROR_NO_COMPRESSOR_SPACE) {
- strlcpy(reason, "no compressor space", 128);
- }
+ assert(p->p_stats != NULL);
+ entry->jse_starttime = p->p_stats->ps_start; /* abstime process started */
+ entry->jse_killtime = 0; /* abstime jetsam chose to kill process */
+ entry->killed = 0; /* the jetsam kill cause */
+ entry->jse_gencount = gencount; /* indicates a pass through jetsam thread, when process was targeted to be killed */
- if (freezer_error_code == FREEZER_ERROR_NO_SWAP_SPACE) {
- strlcpy(reason, "no swap space", 128);
- }
+ entry->jse_idle_delta = p->p_memstat_idle_delta; /* Most recent timespan spent in idle-band */
- os_log_with_startup_serial(OS_LOG_DEFAULT, "memorystatus: freezing (general) pid %d [%s]...skipped (%s)",
- aPid, (*p->p_name ? p->p_name : "unknown"), reason);
+#if CONFIG_FREEZE
+ entry->jse_freeze_skip_reason = p->p_memstat_freeze_skip_reason;
+ entry->jse_thaw_count = p->p_memstat_thaw_count;
+#else /* CONFIG_FREEZE */
+ entry->jse_thaw_count = 0;
+ entry->jse_freeze_skip_reason = kMemorystatusFreezeSkipReasonNone;
+#endif /* CONFIG_FREEZE */
- if (vm_compressor_low_on_space() || vm_swap_low_on_space()) {
- break;
- }
- }
- }
+ proc_coalitionids(p, cids);
+ entry->jse_coalition_jetsam_id = cids[COALITION_TYPE_JETSAM];
- if ((ret == -1) &&
- (memorystatus_refreeze_eligible_count >= MIN_THAW_REFREEZE_THRESHOLD) &&
- (refreeze_processes == FALSE)) {
- /*
- * We failed to freeze a process from the IDLE
- * band AND we have some thawed processes
- * AND haven't tried refreezing as yet.
- * Let's try and re-freeze processes in the
- * frozen band that have been resumed in the past
- * and so have brought in state from disk.
- */
+ return TRUE;
+}
- band = (unsigned int) memorystatus_freeze_jetsam_band;
+static void
+memorystatus_init_snapshot_vmstats(memorystatus_jetsam_snapshot_t *snapshot)
+{
+ kern_return_t kr = KERN_SUCCESS;
+ mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
+ vm_statistics64_data_t vm_stat;
- refreeze_processes = TRUE;
+ if ((kr = host_statistics64(host_self(), HOST_VM_INFO64, (host_info64_t)&vm_stat, &count)) != KERN_SUCCESS) {
+ printf("memorystatus_init_jetsam_snapshot_stats: host_statistics64 failed with %d\n", kr);
+ memset(&snapshot->stats, 0, sizeof(snapshot->stats));
+ } else {
+ snapshot->stats.free_pages = vm_stat.free_count;
+ snapshot->stats.active_pages = vm_stat.active_count;
+ snapshot->stats.inactive_pages = vm_stat.inactive_count;
+ snapshot->stats.throttled_pages = vm_stat.throttled_count;
+ snapshot->stats.purgeable_pages = vm_stat.purgeable_count;
+ snapshot->stats.wired_pages = vm_stat.wire_count;
- goto freeze_process;
+ snapshot->stats.speculative_pages = vm_stat.speculative_count;
+ snapshot->stats.filebacked_pages = vm_stat.external_page_count;
+ snapshot->stats.anonymous_pages = vm_stat.internal_page_count;
+ snapshot->stats.compressions = vm_stat.compressions;
+ snapshot->stats.decompressions = vm_stat.decompressions;
+ snapshot->stats.compressor_pages = vm_stat.compressor_page_count;
+ snapshot->stats.total_uncompressed_pages_in_compressor = vm_stat.total_uncompressed_pages_in_compressor;
}
- proc_list_unlock();
+ get_zone_map_size(&snapshot->stats.zone_map_size, &snapshot->stats.zone_map_capacity);
- return ret;
+ bzero(snapshot->stats.largest_zone_name, sizeof(snapshot->stats.largest_zone_name));
+ get_largest_zone_info(snapshot->stats.largest_zone_name, sizeof(snapshot->stats.largest_zone_name),
+ &snapshot->stats.largest_zone_size);
}
-static inline boolean_t
-memorystatus_can_freeze_processes(void)
+/*
+ * Collect vm statistics at boot.
+ * Called only once (see kern_exec.c)
+ * Data can be consumed at any time.
+ */
+void
+memorystatus_init_at_boot_snapshot()
{
- boolean_t ret;
-
- proc_list_lock();
-
- if (memorystatus_suspended_count) {
- memorystatus_freeze_suspended_threshold = MIN(memorystatus_freeze_suspended_threshold, FREEZE_SUSPENDED_THRESHOLD_DEFAULT);
-
- if ((memorystatus_suspended_count - memorystatus_frozen_count) > memorystatus_freeze_suspended_threshold) {
- ret = TRUE;
- } else {
- ret = FALSE;
- }
- } else {
- ret = FALSE;
- }
-
- proc_list_unlock();
+ memorystatus_init_snapshot_vmstats(&memorystatus_at_boot_snapshot);
+ memorystatus_at_boot_snapshot.entry_count = 0;
+ memorystatus_at_boot_snapshot.notification_time = 0; /* updated when consumed */
+ memorystatus_at_boot_snapshot.snapshot_time = mach_absolute_time();
+}
- return ret;
+static void
+memorystatus_init_jetsam_snapshot_header(memorystatus_jetsam_snapshot_t *snapshot)
+{
+ memorystatus_init_snapshot_vmstats(snapshot);
+ snapshot->snapshot_time = mach_absolute_time();
+ snapshot->notification_time = 0;
+ snapshot->js_gencount = 0;
}
-static boolean_t
-memorystatus_can_freeze(boolean_t *memorystatus_freeze_swap_low)
+static void
+memorystatus_init_jetsam_snapshot_locked(memorystatus_jetsam_snapshot_t *od_snapshot, uint32_t ods_list_count )
{
- boolean_t can_freeze = TRUE;
+ proc_t p, next_p;
+ unsigned int b = 0, i = 0;
- /* Only freeze if we're sufficiently low on memory; this holds off freeze right
- * after boot, and is generally is a no-op once we've reached steady state. */
- if (memorystatus_available_pages > memorystatus_freeze_threshold) {
- return FALSE;
- }
+ memorystatus_jetsam_snapshot_t *snapshot = NULL;
+ memorystatus_jetsam_snapshot_entry_t *snapshot_list = NULL;
+ unsigned int snapshot_max = 0;
- /* Check minimum suspended process threshold. */
- if (!memorystatus_can_freeze_processes()) {
- return FALSE;
- }
- assert(VM_CONFIG_COMPRESSOR_IS_PRESENT);
+ LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED);
- if (!VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
+ if (od_snapshot) {
/*
- * In-core compressor used for freezing WITHOUT on-disk swap support.
+ * This is an on_demand snapshot
*/
- if (vm_compressor_low_on_space()) {
- if (*memorystatus_freeze_swap_low) {
- *memorystatus_freeze_swap_low = TRUE;
- }
-
- can_freeze = FALSE;
- } else {
- if (*memorystatus_freeze_swap_low) {
- *memorystatus_freeze_swap_low = FALSE;
- }
-
- can_freeze = TRUE;
- }
+ snapshot = od_snapshot;
+ snapshot_list = od_snapshot->entries;
+ snapshot_max = ods_list_count;
} else {
/*
- * Freezing WITH on-disk swap support.
- *
- * In-core compressor fronts the swap.
+ * This is a jetsam event snapshot
*/
- if (vm_swap_low_on_space()) {
- if (*memorystatus_freeze_swap_low) {
- *memorystatus_freeze_swap_low = TRUE;
- }
-
- can_freeze = FALSE;
- }
+ snapshot = memorystatus_jetsam_snapshot;
+ snapshot_list = memorystatus_jetsam_snapshot->entries;
+ snapshot_max = memorystatus_jetsam_snapshot_max;
}
- return can_freeze;
-}
-
-/*
- * This function evaluates if the currently frozen processes deserve
- * to stay in the higher jetsam band. If the # of thaws of a process
- * is below our threshold, then we will demote that process into the IDLE
- * band and put it at the head. We don't immediately kill the process here
- * because it already has state on disk and so it might be worth giving
- * it another shot at getting thawed/resumed and used.
- */
-static void
-memorystatus_demote_frozen_processes(void)
-{
- unsigned int band = (unsigned int) memorystatus_freeze_jetsam_band;
- unsigned int demoted_proc_count = 0;
- proc_t p = PROC_NULL, next_p = PROC_NULL;
-
- proc_list_lock();
-
- if (memorystatus_freeze_enabled == FALSE) {
- /*
- * Freeze has been disabled likely to
- * reclaim swap space. So don't change
- * any state on the frozen processes.
- */
- proc_list_unlock();
- return;
- }
+ memorystatus_init_jetsam_snapshot_header(snapshot);
- next_p = memorystatus_get_first_proc_locked(&band, FALSE);
+ next_p = memorystatus_get_first_proc_locked(&b, TRUE);
while (next_p) {
p = next_p;
- next_p = memorystatus_get_next_proc_locked(&band, p, FALSE);
+ next_p = memorystatus_get_next_proc_locked(&b, p, TRUE);
- if ((p->p_memstat_state & P_MEMSTAT_FROZEN) == FALSE) {
+ if (FALSE == memorystatus_init_jetsam_snapshot_entry_locked(p, &snapshot_list[i], snapshot->js_gencount)) {
continue;
}
- if (p->p_memstat_state & P_MEMSTAT_LOCKED) {
- continue;
+ MEMORYSTATUS_DEBUG(0, "jetsam snapshot pid %d, uuid = %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n",
+ p->p_pid,
+ p->p_uuid[0], p->p_uuid[1], p->p_uuid[2], p->p_uuid[3], p->p_uuid[4], p->p_uuid[5], p->p_uuid[6], p->p_uuid[7],
+ p->p_uuid[8], p->p_uuid[9], p->p_uuid[10], p->p_uuid[11], p->p_uuid[12], p->p_uuid[13], p->p_uuid[14], p->p_uuid[15]);
+
+ if (++i == snapshot_max) {
+ break;
}
+ }
- if (p->p_memstat_thaw_count < memorystatus_thaw_count_demotion_threshold) {
- p->p_memstat_state &= ~P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND;
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ snapshot->entry_count = i;
+
+ if (!od_snapshot) {
+ /* update the system buffer count */
+ memorystatus_jetsam_snapshot_count = i;
+ }
+}
- memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, TRUE, TRUE);
#if DEVELOPMENT || DEBUG
- os_log_with_startup_serial(OS_LOG_DEFAULT, "memorystatus_demote_frozen_process pid %d [%s]",
- p->p_pid, (*p->p_name ? p->p_name : "unknown"));
-#endif /* DEVELOPMENT || DEBUG */
- /*
- * The freezer thread will consider this a normal app to be frozen
- * because it is in the IDLE band. So we don't need the
- * P_MEMSTAT_REFREEZE_ELIGIBLE state here. Also, if it gets resumed
- * we'll correctly count it as eligible for re-freeze again.
- *
- * We don't drop the frozen count because this process still has
- * state on disk. So there's a chance it gets resumed and then it
- * should land in the higher jetsam band. For that it needs to
- * remain marked frozen.
- */
- if (p->p_memstat_state & P_MEMSTAT_REFREEZE_ELIGIBLE) {
- p->p_memstat_state &= ~P_MEMSTAT_REFREEZE_ELIGIBLE;
- memorystatus_refreeze_eligible_count--;
- }
+#if CONFIG_JETSAM
+static int
+memorystatus_cmd_set_panic_bits(user_addr_t buffer, size_t buffer_size)
+{
+ int ret;
+ memorystatus_jetsam_panic_options_t debug;
- demoted_proc_count++;
- }
+ if (buffer_size != sizeof(memorystatus_jetsam_panic_options_t)) {
+ return EINVAL;
+ }
- if (demoted_proc_count == memorystatus_max_frozen_demotions_daily) {
- break;
- }
+ ret = copyin(buffer, &debug, buffer_size);
+ if (ret) {
+ return ret;
}
- memorystatus_thaw_count = 0;
- proc_list_unlock();
-}
+ /* Panic bits match kMemorystatusKilled* enum */
+ memorystatus_jetsam_panic_debug = (memorystatus_jetsam_panic_debug & ~debug.mask) | (debug.data & debug.mask);
+
+ /* Copyout new value */
+ debug.data = memorystatus_jetsam_panic_debug;
+ ret = copyout(&debug, buffer, sizeof(memorystatus_jetsam_panic_options_t));
+ return ret;
+}
+#endif /* CONFIG_JETSAM */
/*
- * This function will do 4 things:
+ * Verify that the given bucket has been sorted correctly.
*
- * 1) check to see if we are currently in a degraded freezer mode, and if so:
- * - check to see if our window has expired and we should exit this mode, OR,
- * - return a budget based on the degraded throttle window's max. pageouts vs current pageouts.
+ * Walks through the bucket and verifies that all pids in the
+ * expected_order buffer are in that bucket and in the same
+ * relative order.
*
- * 2) check to see if we are in a NEW normal window and update the normal throttle window's params.
- *
- * 3) check what the current normal window allows for a budget.
- *
- * 4) calculate the current rate of pageouts for DEGRADED_WINDOW_MINS duration. If that rate is below
- * what we would normally expect, then we are running low on our daily budget and need to enter
- * degraded perf. mode.
+ * The proc_list_lock must be held by the caller.
*/
+static int
+memorystatus_verify_sort_order(unsigned int bucket_index, pid_t *expected_order, size_t num_pids)
+{
+ LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED);
-static void
-memorystatus_freeze_update_throttle(uint64_t *budget_pages_allowed)
+ int error = 0;
+ proc_t p = NULL;
+ size_t i = 0;
+
+ /*
+ * NB: We allow other procs to be mixed in within the expected ones.
+ * We just need the expected procs to be in the right order relative to each other.
+ */
+ p = memorystatus_get_first_proc_locked(&bucket_index, FALSE);
+ while (p) {
+ if (p->p_pid == expected_order[i]) {
+ i++;
+ }
+ if (i == num_pids) {
+ break;
+ }
+ p = memorystatus_get_next_proc_locked(&bucket_index, p, FALSE);
+ }
+ if (i != num_pids) {
+ char buffer[128];
+ size_t len = sizeof(buffer);
+ size_t buffer_idx = 0;
+ os_log_error(OS_LOG_DEFAULT, "memorystatus_verify_sort_order: Processes in bucket %d were not sorted properly\n", bucket_index);
+ for (i = 0; i < num_pids; i++) {
+ int num_written = snprintf(buffer + buffer_idx, len - buffer_idx, "%d,", expected_order[i]);
+ if (num_written <= 0) {
+ break;
+ }
+ if (buffer_idx + (unsigned int) num_written >= len) {
+ break;
+ }
+ buffer_idx += num_written;
+ }
+ os_log_error(OS_LOG_DEFAULT, "memorystatus_verify_sort_order: Expected order [%s]", buffer);
+ memset(buffer, 0, len);
+ buffer_idx = 0;
+ p = memorystatus_get_first_proc_locked(&bucket_index, FALSE);
+ i = 0;
+ os_log_error(OS_LOG_DEFAULT, "memorystatus_verify_sort_order: Actual order:");
+ while (p) {
+ int num_written;
+ if (buffer_idx == 0) {
+ num_written = snprintf(buffer + buffer_idx, len - buffer_idx, "%zu: %d,", i, p->p_pid);
+ } else {
+ num_written = snprintf(buffer + buffer_idx, len - buffer_idx, "%d,", p->p_pid);
+ }
+ if (num_written <= 0) {
+ break;
+ }
+ buffer_idx += (unsigned int) num_written;
+ assert(buffer_idx <= len);
+ if (i % 10 == 0) {
+ os_log_error(OS_LOG_DEFAULT, "memorystatus_verify_sort_order: %s", buffer);
+ buffer_idx = 0;
+ }
+ p = memorystatus_get_next_proc_locked(&bucket_index, p, FALSE);
+ i++;
+ }
+ if (buffer_idx != 0) {
+ os_log_error(OS_LOG_DEFAULT, "memorystatus_verify_sort_order: %s", buffer);
+ }
+ error = EINVAL;
+ }
+ return error;
+}
+
+/*
+ * Triggers a sort_order on a specified jetsam priority band.
+ * This is for testing only, used to force a path through the sort
+ * function.
+ */
+static int
+memorystatus_cmd_test_jetsam_sort(int priority,
+ int sort_order,
+ user_addr_t expected_order_user,
+ size_t expected_order_user_len)
{
- clock_sec_t sec;
- clock_nsec_t nsec;
- mach_timespec_t ts;
+ int error = 0;
+ unsigned int bucket_index = 0;
+ static size_t kMaxPids = 8;
+ pid_t expected_order[kMaxPids];
+ size_t copy_size = sizeof(expected_order);
+ size_t num_pids;
- unsigned int freeze_daily_pageouts_max = 0;
+ if (expected_order_user_len < copy_size) {
+ copy_size = expected_order_user_len;
+ }
+ num_pids = copy_size / sizeof(pid_t);
-#if DEVELOPMENT || DEBUG
- if (!memorystatus_freeze_throttle_enabled) {
- /*
- * No throttling...we can use the full budget everytime.
- */
- *budget_pages_allowed = UINT64_MAX;
- return;
+ error = copyin(expected_order_user, expected_order, copy_size);
+ if (error != 0) {
+ return error;
}
-#endif
- clock_get_system_nanotime(&sec, &nsec);
- ts.tv_sec = sec;
- ts.tv_nsec = nsec;
+ if (priority == -1) {
+ /* Use as shorthand for default priority */
+ bucket_index = JETSAM_PRIORITY_DEFAULT;
+ } else {
+ bucket_index = (unsigned int)priority;
+ }
- struct throttle_interval_t *interval = NULL;
+ /*
+ * Acquire lock before sorting so we can check the sort order
+ * while still holding the lock.
+ */
+ proc_list_lock();
- if (memorystatus_freeze_degradation == TRUE) {
- interval = degraded_throttle_window;
+ memorystatus_sort_bucket_locked(bucket_index, sort_order);
- if (CMP_MACH_TIMESPEC(&ts, &interval->ts) >= 0) {
- memorystatus_freeze_degradation = FALSE;
- interval->pageouts = 0;
- interval->max_pageouts = 0;
- } else {
- *budget_pages_allowed = interval->max_pageouts - interval->pageouts;
- }
+ if (expected_order_user != CAST_USER_ADDR_T(NULL) && expected_order_user_len > 0) {
+ error = memorystatus_verify_sort_order(bucket_index, expected_order, num_pids);
}
- interval = normal_throttle_window;
+ proc_list_unlock();
- if (CMP_MACH_TIMESPEC(&ts, &interval->ts) >= 0) {
- /*
- * New throttle window.
- * Rollover any unused budget.
- * Also ask the storage layer what the new budget needs to be.
- */
- uint64_t freeze_daily_budget = 0;
- unsigned int daily_budget_pageouts = 0;
+ return error;
+}
- if (vm_swap_max_budget(&freeze_daily_budget)) {
- memorystatus_freeze_daily_mb_max = (freeze_daily_budget / (1024 * 1024));
- os_log_with_startup_serial(OS_LOG_DEFAULT, "memorystatus: memorystatus_freeze_daily_mb_max set to %dMB\n", memorystatus_freeze_daily_mb_max);
- }
+#endif /* DEVELOPMENT || DEBUG */
- freeze_daily_pageouts_max = memorystatus_freeze_daily_mb_max * (1024 * 1024 / PAGE_SIZE);
+/*
+ * Prepare the process to be killed (set state, update snapshot) and kill it.
+ */
+static uint64_t memorystatus_purge_before_jetsam_success = 0;
- daily_budget_pageouts = (interval->burst_multiple * (((uint64_t)interval->mins * freeze_daily_pageouts_max) / NORMAL_WINDOW_MINS));
- interval->max_pageouts = (interval->max_pageouts - interval->pageouts) + daily_budget_pageouts;
+static boolean_t
+memorystatus_kill_proc(proc_t p, uint32_t cause, os_reason_t jetsam_reason, boolean_t *killed, uint64_t *footprint_of_killed_proc)
+{
+ pid_t aPid = 0;
+ uint32_t aPid_ep = 0;
- interval->ts.tv_sec = interval->mins * 60;
- interval->ts.tv_nsec = 0;
- ADD_MACH_TIMESPEC(&interval->ts, &ts);
- /* Since we update the throttle stats pre-freeze, adjust for overshoot here */
- if (interval->pageouts > interval->max_pageouts) {
- interval->pageouts -= interval->max_pageouts;
- } else {
- interval->pageouts = 0;
- }
- *budget_pages_allowed = interval->max_pageouts;
+ uint64_t killtime = 0;
+ clock_sec_t tv_sec;
+ clock_usec_t tv_usec;
+ uint32_t tv_msec;
+ boolean_t retval = FALSE;
- memorystatus_demote_frozen_processes();
- } else {
- /*
- * Current throttle window.
- * Deny freezing if we have no budget left.
- * Try graceful degradation if we are within 25% of:
- * - the daily budget, and
- * - the current budget left is below our normal budget expectations.
- */
+ aPid = p->p_pid;
+ aPid_ep = p->p_memstat_effectivepriority;
-#if DEVELOPMENT || DEBUG
+ if (cause != kMemorystatusKilledVnodes && cause != kMemorystatusKilledZoneMapExhaustion) {
/*
- * This can only happen in the INTERNAL configs because we allow modifying the daily budget for testing.
+ * Genuine memory pressure and not other (vnode/zone) resource exhaustion.
*/
+ boolean_t success = FALSE;
+ uint64_t num_pages_purged;
+ uint64_t num_pages_reclaimed = 0;
+ uint64_t num_pages_unsecluded = 0;
- if (freeze_daily_pageouts_max > interval->max_pageouts) {
+ networking_memstatus_callout(p, cause);
+ num_pages_purged = vm_purgeable_purge_task_owned(p->task);
+ num_pages_reclaimed += num_pages_purged;
+#if CONFIG_SECLUDED_MEMORY
+ if (cause == kMemorystatusKilledVMPageShortage &&
+ vm_page_secluded_count > 0 &&
+ task_can_use_secluded_mem(p->task, FALSE)) {
/*
- * We just bumped the daily budget. Re-evaluate our normal window params.
+ * We're about to kill a process that has access
+ * to the secluded pool. Drain that pool into the
+ * free or active queues to make these pages re-appear
+ * as "available", which might make us no longer need
+ * to kill that process.
+ * Since the secluded pool does not get refilled while
+ * a process has access to it, it should remain
+ * drained.
*/
- interval->max_pageouts = (interval->burst_multiple * (((uint64_t)interval->mins * freeze_daily_pageouts_max) / NORMAL_WINDOW_MINS));
- memorystatus_freeze_degradation = FALSE; //we'll re-evaluate this below...
+ num_pages_unsecluded = vm_page_secluded_drain();
+ num_pages_reclaimed += num_pages_unsecluded;
}
-#endif /* DEVELOPMENT || DEBUG */
+#endif /* CONFIG_SECLUDED_MEMORY */
- if (memorystatus_freeze_degradation == FALSE) {
- if (interval->pageouts >= interval->max_pageouts) {
- *budget_pages_allowed = 0;
+ if (num_pages_reclaimed) {
+ /*
+ * We actually reclaimed something and so let's
+ * check if we need to continue with the kill.
+ */
+ if (cause == kMemorystatusKilledHiwat) {
+ uint64_t footprint_in_bytes = get_task_phys_footprint(p->task);
+ uint64_t memlimit_in_bytes = (((uint64_t)p->p_memstat_memlimit) * 1024ULL * 1024ULL); /* convert MB to bytes */
+ success = (footprint_in_bytes <= memlimit_in_bytes);
} else {
- int budget_left = interval->max_pageouts - interval->pageouts;
- int budget_threshold = (freeze_daily_pageouts_max * FREEZE_DEGRADATION_BUDGET_THRESHOLD) / 100;
-
- mach_timespec_t time_left = {0, 0};
-
- time_left.tv_sec = interval->ts.tv_sec;
- time_left.tv_nsec = 0;
-
- SUB_MACH_TIMESPEC(&time_left, &ts);
-
- if (budget_left <= budget_threshold) {
+ success = (memorystatus_avail_pages_below_pressure() == FALSE);
+#if CONFIG_SECLUDED_MEMORY
+ if (!success && num_pages_unsecluded) {
/*
- * For the current normal window, calculate how much we would pageout in a DEGRADED_WINDOW_MINS duration.
- * And also calculate what we would pageout for the same DEGRADED_WINDOW_MINS duration if we had the full
- * daily pageout budget.
+ * We just drained the secluded pool
+ * because we're about to kill a
+ * process that has access to it.
+ * This is an important process and
+ * we'd rather not kill it unless
+ * absolutely necessary, so declare
+ * success even if draining the pool
+ * did not quite get us out of the
+ * "pressure" level but still got
+ * us out of the "critical" level.
*/
+ success = (memorystatus_avail_pages_below_critical() == FALSE);
+ }
+#endif /* CONFIG_SECLUDED_MEMORY */
+ }
- unsigned int current_budget_rate_allowed = ((budget_left / time_left.tv_sec) / 60) * DEGRADED_WINDOW_MINS;
- unsigned int normal_budget_rate_allowed = (freeze_daily_pageouts_max / NORMAL_WINDOW_MINS) * DEGRADED_WINDOW_MINS;
-
- /*
- * The current rate of pageouts is below what we would expect for
- * the normal rate i.e. we have below normal budget left and so...
- */
+ if (success) {
+ memorystatus_purge_before_jetsam_success++;
- if (current_budget_rate_allowed < normal_budget_rate_allowed) {
- memorystatus_freeze_degradation = TRUE;
- degraded_throttle_window->max_pageouts = current_budget_rate_allowed;
- degraded_throttle_window->pageouts = 0;
+ os_log_with_startup_serial(OS_LOG_DEFAULT, "memorystatus: reclaimed %llu pages (%llu purged, %llu unsecluded) from pid %d [%s] and avoided %s\n",
+ num_pages_reclaimed, num_pages_purged, num_pages_unsecluded, aPid, ((p && *p->p_name) ? p->p_name : "unknown"), memorystatus_kill_cause_name[cause]);
- /*
- * Switch over to the degraded throttle window so the budget
- * doled out is based on that window.
- */
- interval = degraded_throttle_window;
- }
- }
+ *killed = FALSE;
- *budget_pages_allowed = interval->max_pageouts - interval->pageouts;
+ return TRUE;
}
}
}
- MEMORYSTATUS_DEBUG(1, "memorystatus_freeze_update_throttle_interval: throttle updated - %d frozen (%d max) within %dm; %dm remaining; throttle %s\n",
- interval->pageouts, interval->max_pageouts, interval->mins, (interval->ts.tv_sec - ts->tv_sec) / 60,
- interval->throttle ? "on" : "off");
-}
+#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
+ MEMORYSTATUS_DEBUG(1, "jetsam: killing pid %d [%s] - %lld Mb > 1 (%d Mb)\n",
+ aPid, (*p->p_name ? p->p_name : "unknown"),
+ (footprint_in_bytes / (1024ULL * 1024ULL)), /* converted bytes to MB */
+ p->p_memstat_memlimit);
+#endif /* CONFIG_JETSAM && (DEVELOPMENT || DEBUG) */
-static void
-memorystatus_freeze_thread(void *param __unused, wait_result_t wr __unused)
-{
- static boolean_t memorystatus_freeze_swap_low = FALSE;
+ killtime = mach_absolute_time();
+ absolutetime_to_microtime(killtime, &tv_sec, &tv_usec);
+ tv_msec = tv_usec / 1000;
- lck_mtx_lock(&freezer_mutex);
+ proc_list_lock();
+ memorystatus_update_jetsam_snapshot_entry_locked(p, cause, killtime);
+ proc_list_unlock();
- if (memorystatus_freeze_enabled) {
- if ((memorystatus_frozen_count < memorystatus_frozen_processes_max) ||
- (memorystatus_refreeze_eligible_count >= MIN_THAW_REFREEZE_THRESHOLD)) {
- if (memorystatus_can_freeze(&memorystatus_freeze_swap_low)) {
- /* Only freeze if we've not exceeded our pageout budgets.*/
- memorystatus_freeze_update_throttle(&memorystatus_freeze_budget_pages_remaining);
+ char kill_reason_string[128];
- if (memorystatus_freeze_budget_pages_remaining) {
- memorystatus_freeze_top_process();
- }
- }
+ if (cause == kMemorystatusKilledHiwat) {
+ strlcpy(kill_reason_string, "killing_highwater_process", 128);
+ } else {
+ if (aPid_ep == JETSAM_PRIORITY_IDLE) {
+ strlcpy(kill_reason_string, "killing_idle_process", 128);
+ } else {
+ strlcpy(kill_reason_string, "killing_top_process", 128);
}
}
/*
- * We use memorystatus_apps_idle_delay_time because if/when we adopt aging for applications,
- * it'll tie neatly into running the freezer once we age an application.
- *
- * Till then, it serves as a good interval that can be tuned via a sysctl too.
+ * memorystatus_do_kill drops a reference, so take another one so we can
+ * continue to use this exit reason even after memorystatus_do_kill()
+ * returns
*/
- memorystatus_freezer_thread_next_run_ts = mach_absolute_time() + memorystatus_apps_idle_delay_time;
+ os_reason_ref(jetsam_reason);
+
+ retval = memorystatus_do_kill(p, cause, jetsam_reason, footprint_of_killed_proc);
+ *killed = retval;
- assert_wait((event_t) &memorystatus_freeze_wakeup, THREAD_UNINT);
- lck_mtx_unlock(&freezer_mutex);
+ os_log_with_startup_serial(OS_LOG_DEFAULT, "%lu.%03d memorystatus: %s pid %d [%s] (%s %d) %lluKB - memorystatus_available_pages: %llu",
+ (unsigned long)tv_sec, tv_msec, kill_reason_string,
+ aPid, ((p && *p->p_name) ? p->p_name : "unknown"),
+ memorystatus_kill_cause_name[cause], aPid_ep,
+ (*footprint_of_killed_proc) >> 10, (uint64_t)MEMORYSTATUS_LOG_AVAILABLE_PAGES);
- thread_block((thread_continue_t) memorystatus_freeze_thread);
+ return retval;
}
+/*
+ * Jetsam the first process in the queue.
+ */
static boolean_t
-memorystatus_freeze_thread_should_run(void)
+memorystatus_kill_top_process(boolean_t any, boolean_t sort_flag, uint32_t cause, os_reason_t jetsam_reason,
+ int32_t *priority, uint32_t *errors, uint64_t *memory_reclaimed)
{
- /*
- * No freezer_mutex held here...see why near call-site
- * within memorystatus_pages_update().
- */
-
- boolean_t should_run = FALSE;
-
- if (memorystatus_freeze_enabled == FALSE) {
- goto out;
- }
-
- if (memorystatus_available_pages > memorystatus_freeze_threshold) {
- goto out;
- }
+ pid_t aPid;
+ proc_t p = PROC_NULL, next_p = PROC_NULL;
+ boolean_t new_snapshot = FALSE, force_new_snapshot = FALSE, killed = FALSE, freed_mem = FALSE;
+ unsigned int i = 0;
+ uint32_t aPid_ep;
+ int32_t local_max_kill_prio = JETSAM_PRIORITY_IDLE;
+ uint64_t footprint_of_killed_proc = 0;
- if ((memorystatus_frozen_count >= memorystatus_frozen_processes_max) &&
- (memorystatus_refreeze_eligible_count < MIN_THAW_REFREEZE_THRESHOLD)) {
- goto out;
- }
+#ifndef CONFIG_FREEZE
+#pragma unused(any)
+#endif
- if (memorystatus_frozen_shared_mb_max && (memorystatus_frozen_shared_mb >= memorystatus_frozen_shared_mb_max)) {
- goto out;
- }
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_START,
+ MEMORYSTATUS_LOG_AVAILABLE_PAGES, 0, 0, 0, 0);
- uint64_t curr_time = mach_absolute_time();
- if (curr_time < memorystatus_freezer_thread_next_run_ts) {
- goto out;
+#if CONFIG_JETSAM
+ if (sort_flag == TRUE) {
+ (void)memorystatus_sort_bucket(JETSAM_PRIORITY_FOREGROUND, JETSAM_SORT_DEFAULT);
}
- should_run = TRUE;
+ local_max_kill_prio = max_kill_priority;
-out:
- return should_run;
-}
+ force_new_snapshot = FALSE;
-static int
-sysctl_memorystatus_do_fastwake_warmup_all SYSCTL_HANDLER_ARGS
-{
-#pragma unused(oidp, req, arg1, arg2)
+#else /* CONFIG_JETSAM */
- /* Need to be root or have entitlement */
- if (!kauth_cred_issuser(kauth_cred_get()) && !IOTaskHasEntitlement(current_task(), MEMORYSTATUS_ENTITLEMENT)) {
- return EPERM;
+ if (sort_flag == TRUE) {
+ (void)memorystatus_sort_bucket(JETSAM_PRIORITY_IDLE, JETSAM_SORT_DEFAULT);
}
- if (memorystatus_freeze_enabled == FALSE) {
- return ENOTSUP;
+ /*
+ * On macos, we currently only have 2 reasons to be here:
+ *
+ * kMemorystatusKilledZoneMapExhaustion
+ * AND
+ * kMemorystatusKilledVMCompressorSpaceShortage
+ *
+ * If we are here because of kMemorystatusKilledZoneMapExhaustion, we will consider
+ * any and all processes as eligible kill candidates since we need to avoid a panic.
+ *
+ * Since this function can be called async. it is harder to toggle the max_kill_priority
+ * value before and after a call. And so we use this local variable to set the upper band
+ * on the eligible kill bands.
+ */
+ if (cause == kMemorystatusKilledZoneMapExhaustion) {
+ local_max_kill_prio = JETSAM_PRIORITY_MAX;
+ } else {
+ local_max_kill_prio = max_kill_priority;
}
- do_fastwake_warmup_all();
-
- return 0;
-}
-
-SYSCTL_PROC(_kern, OID_AUTO, memorystatus_do_fastwake_warmup_all, CTLTYPE_INT | CTLFLAG_WR | CTLFLAG_LOCKED | CTLFLAG_MASKED,
- 0, 0, &sysctl_memorystatus_do_fastwake_warmup_all, "I", "");
-
-#endif /* CONFIG_FREEZE */
-
-#if VM_PRESSURE_EVENTS
-
-#if CONFIG_MEMORYSTATUS
-
-static int
-memorystatus_send_note(int event_code, void *data, size_t data_length)
-{
- int ret;
- struct kev_msg ev_msg;
-
- ev_msg.vendor_code = KEV_VENDOR_APPLE;
- ev_msg.kev_class = KEV_SYSTEM_CLASS;
- ev_msg.kev_subclass = KEV_MEMORYSTATUS_SUBCLASS;
-
- ev_msg.event_code = event_code;
+ /*
+ * And, because we are here under extreme circumstances, we force a snapshot even for
+ * IDLE kills.
+ */
+ force_new_snapshot = TRUE;
- ev_msg.dv[0].data_length = data_length;
- ev_msg.dv[0].data_ptr = data;
- ev_msg.dv[1].data_length = 0;
+#endif /* CONFIG_JETSAM */
- ret = kev_post_msg(&ev_msg);
- if (ret) {
- printf("%s: kev_post_msg() failed, err %d\n", __func__, ret);
+ if (cause != kMemorystatusKilledZoneMapExhaustion &&
+ jetsam_current_thread() != NULL &&
+ jetsam_current_thread()->limit_to_low_bands &&
+ local_max_kill_prio > JETSAM_PRIORITY_BACKGROUND) {
+ local_max_kill_prio = JETSAM_PRIORITY_BACKGROUND;
}
- return ret;
-}
+ proc_list_lock();
-boolean_t
-memorystatus_warn_process(pid_t pid, __unused boolean_t is_active, __unused boolean_t is_fatal, boolean_t limit_exceeded)
-{
- boolean_t ret = FALSE;
- boolean_t found_knote = FALSE;
- struct knote *kn = NULL;
- int send_knote_count = 0;
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ while (next_p && (next_p->p_memstat_effectivepriority <= local_max_kill_prio)) {
+ p = next_p;
+ next_p = memorystatus_get_next_proc_locked(&i, p, TRUE);
- /*
- * See comment in sysctl_memorystatus_vm_pressure_send.
- */
- memorystatus_klist_lock();
+ aPid = p->p_pid;
+ aPid_ep = p->p_memstat_effectivepriority;
- SLIST_FOREACH(kn, &memorystatus_klist, kn_selnext) {
- proc_t knote_proc = knote_get_kq(kn)->kq_p;
- pid_t knote_pid = knote_proc->p_pid;
+ if (p->p_memstat_state & (P_MEMSTAT_ERROR | P_MEMSTAT_TERMINATED)) {
+ continue; /* with lock held */
+ }
- if (knote_pid == pid) {
+ if (cause == kMemorystatusKilledVnodes) {
/*
- * By setting the "fflags" here, we are forcing
- * a process to deal with the case where it's
- * bumping up into its memory limits. If we don't
- * do this here, we will end up depending on the
- * system pressure snapshot evaluation in
- * filt_memorystatus().
+ * If the system runs out of vnodes, we systematically jetsam
+ * processes in hopes of stumbling onto a vnode gain that helps
+ * the system recover. The process that happens to trigger
+ * this path has no known relationship to the vnode shortage.
+ * Deadlock avoidance: attempt to safeguard the caller.
*/
-#if CONFIG_EMBEDDED
- if (!limit_exceeded) {
+ if (p == current_proc()) {
+ /* do not jetsam the current process */
+ continue;
+ }
+ }
+
+#if CONFIG_FREEZE
+ boolean_t skip;
+ boolean_t reclaim_proc = !(p->p_memstat_state & P_MEMSTAT_LOCKED);
+ if (any || reclaim_proc) {
+ skip = FALSE;
+ } else {
+ skip = TRUE;
+ }
+
+ if (skip) {
+ continue;
+ } else
+#endif
+ {
+ if (proc_ref_locked(p) == p) {
/*
- * Intentionally set either the unambiguous limit warning,
- * the system-wide critical or the system-wide warning
- * notification bit.
+ * Mark as terminated so that if exit1() indicates success, but the process (for example)
+ * is blocked in task_exception_notify(), it'll be skipped if encountered again - see
+ * <rdar://problem/13553476>. This is cheaper than examining P_LEXIT, which requires the
+ * acquisition of the proc lock.
*/
-
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN) {
- kn->kn_fflags = NOTE_MEMORYSTATUS_PROC_LIMIT_WARN;
- found_knote = TRUE;
- send_knote_count++;
- } else if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PRESSURE_CRITICAL) {
- kn->kn_fflags = NOTE_MEMORYSTATUS_PRESSURE_CRITICAL;
- found_knote = TRUE;
- send_knote_count++;
- } else if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PRESSURE_WARN) {
- kn->kn_fflags = NOTE_MEMORYSTATUS_PRESSURE_WARN;
- found_knote = TRUE;
- send_knote_count++;
- }
+ p->p_memstat_state |= P_MEMSTAT_TERMINATED;
} else {
/*
- * Send this notification when a process has exceeded a soft limit.
+ * We need to restart the search again because
+ * proc_ref_locked _can_ drop the proc_list lock
+ * and we could have lost our stored next_p via
+ * an exit() on another core.
*/
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL) {
- kn->kn_fflags = NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL;
- found_knote = TRUE;
- send_knote_count++;
- }
+ i = 0;
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ continue;
}
-#else /* CONFIG_EMBEDDED */
- if (!limit_exceeded) {
- /*
- * Processes on desktop are not expecting to handle a system-wide
- * critical or system-wide warning notification from this path.
- * Intentionally set only the unambiguous limit warning here.
- *
- * If the limit is soft, however, limit this to one notification per
- * active/inactive limit (per each registered listener).
- */
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN) {
- found_knote = TRUE;
- if (!is_fatal) {
- /*
- * Restrict proc_limit_warn notifications when
- * non-fatal (soft) limit is at play.
- */
- if (is_active) {
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_ACTIVE) {
- /*
- * Mark this knote for delivery.
- */
- kn->kn_fflags = NOTE_MEMORYSTATUS_PROC_LIMIT_WARN;
- /*
- * And suppress it from future notifications.
- */
- kn->kn_sfflags &= ~NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_ACTIVE;
- send_knote_count++;
- }
- } else {
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_INACTIVE) {
- /*
- * Mark this knote for delivery.
- */
- kn->kn_fflags = NOTE_MEMORYSTATUS_PROC_LIMIT_WARN;
- /*
- * And suppress it from future notifications.
- */
- kn->kn_sfflags &= ~NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_INACTIVE;
- send_knote_count++;
- }
- }
- } else {
- /*
- * No restriction on proc_limit_warn notifications when
- * fatal (hard) limit is at play.
- */
- kn->kn_fflags = NOTE_MEMORYSTATUS_PROC_LIMIT_WARN;
- send_knote_count++;
- }
- }
- } else {
- /*
- * Send this notification when a process has exceeded a soft limit,
- */
+ /*
+ * Capture a snapshot if none exists and:
+ * - we are forcing a new snapshot creation, either because:
+ * - on a particular platform we need these snapshots every time, OR
+ * - a boot-arg/embedded device tree property has been set.
+ * - priority was not requested (this is something other than an ambient kill)
+ * - the priority was requested *and* the targeted process is not at idle priority
+ */
+ if ((memorystatus_jetsam_snapshot_count == 0) &&
+ (force_new_snapshot || memorystatus_idle_snapshot || ((!priority) || (priority && (aPid_ep != JETSAM_PRIORITY_IDLE))))) {
+ memorystatus_init_jetsam_snapshot_locked(NULL, 0);
+ new_snapshot = TRUE;
+ }
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL) {
- found_knote = TRUE;
- if (!is_fatal) {
- /*
- * Restrict critical notifications for soft limits.
- */
+ proc_list_unlock();
- if (is_active) {
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_ACTIVE) {
- /*
- * Suppress future proc_limit_critical notifications
- * for the active soft limit.
- */
- kn->kn_sfflags &= ~NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_ACTIVE;
- kn->kn_fflags = NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL;
- send_knote_count++;
- }
- } else {
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_INACTIVE) {
- /*
- * Suppress future proc_limit_critical_notifications
- * for the inactive soft limit.
- */
- kn->kn_sfflags &= ~NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_INACTIVE;
- kn->kn_fflags = NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL;
- send_knote_count++;
- }
- }
- } else {
- /*
- * We should never be trying to send a critical notification for
- * a hard limit... the process would be killed before it could be
- * received.
- */
- panic("Caught sending pid %d a critical warning for a fatal limit.\n", pid);
+ freed_mem = memorystatus_kill_proc(p, cause, jetsam_reason, &killed, &footprint_of_killed_proc); /* purged and/or killed 'p' */
+ /* Success? */
+ if (freed_mem) {
+ if (killed) {
+ *memory_reclaimed = footprint_of_killed_proc;
+ if (priority) {
+ *priority = aPid_ep;
}
+ } else {
+ /* purged */
+ proc_list_lock();
+ p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
+ proc_list_unlock();
}
+ proc_rele(p);
+ goto exit;
}
-#endif /* CONFIG_EMBEDDED */
- }
- }
- if (found_knote) {
- if (send_knote_count > 0) {
- KNOTE(&memorystatus_klist, 0);
+ /*
+ * Failure - first unwind the state,
+ * then fall through to restart the search.
+ */
+ proc_list_lock();
+ proc_rele_locked(p);
+ p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
+ p->p_memstat_state |= P_MEMSTAT_ERROR;
+ *errors += 1;
+
+ i = 0;
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
}
- ret = TRUE;
}
- memorystatus_klist_unlock();
-
- return ret;
-}
-
-/*
- * Can only be set by the current task on itself.
- */
-int
-memorystatus_low_mem_privileged_listener(uint32_t op_flags)
-{
- boolean_t set_privilege = FALSE;
- /*
- * Need an entitlement check here?
- */
- if (op_flags == MEMORYSTATUS_CMD_PRIVILEGED_LISTENER_ENABLE) {
- set_privilege = TRUE;
- } else if (op_flags == MEMORYSTATUS_CMD_PRIVILEGED_LISTENER_DISABLE) {
- set_privilege = FALSE;
- } else {
- return EINVAL;
- }
+ proc_list_unlock();
- return task_low_mem_privileged_listener(current_task(), set_privilege, NULL);
-}
+exit:
+ os_reason_free(jetsam_reason);
-int
-memorystatus_send_pressure_note(pid_t pid)
-{
- MEMORYSTATUS_DEBUG(1, "memorystatus_send_pressure_note(): pid %d\n", pid);
- return memorystatus_send_note(kMemorystatusPressureNote, &pid, sizeof(pid));
-}
+ if (!killed) {
+ *memory_reclaimed = 0;
-void
-memorystatus_send_low_swap_note(void)
-{
- struct knote *kn = NULL;
-
- memorystatus_klist_lock();
- SLIST_FOREACH(kn, &memorystatus_klist, kn_selnext) {
- /* We call is_knote_registered_modify_task_pressure_bits to check if the sfflags for the
- * current note contain NOTE_MEMORYSTATUS_LOW_SWAP. Once we find one note in the memorystatus_klist
- * that has the NOTE_MEMORYSTATUS_LOW_SWAP flags in its sfflags set, we call KNOTE with
- * kMemoryStatusLowSwap as the hint to process and update all knotes on the memorystatus_klist accordingly. */
- if (is_knote_registered_modify_task_pressure_bits(kn, NOTE_MEMORYSTATUS_LOW_SWAP, NULL, 0, 0) == TRUE) {
- KNOTE(&memorystatus_klist, kMemorystatusLowSwap);
- break;
+ /* Clear snapshot if freshly captured and no target was found */
+ if (new_snapshot) {
+ proc_list_lock();
+ memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
+ proc_list_unlock();
}
}
- memorystatus_klist_unlock();
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_END,
+ MEMORYSTATUS_LOG_AVAILABLE_PAGES, killed ? aPid : 0, killed, *memory_reclaimed, 0);
+
+ return killed;
}
-boolean_t
-memorystatus_bg_pressure_eligible(proc_t p)
+/*
+ * Jetsam aggressively
+ */
+static boolean_t
+memorystatus_kill_processes_aggressive(uint32_t cause, int aggr_count,
+ int32_t priority_max, uint32_t *errors, uint64_t *memory_reclaimed)
{
- boolean_t eligible = FALSE;
-
- proc_list_lock();
+ pid_t aPid;
+ proc_t p = PROC_NULL, next_p = PROC_NULL;
+ boolean_t new_snapshot = FALSE, killed = FALSE;
+ int kill_count = 0;
+ unsigned int i = 0;
+ int32_t aPid_ep = 0;
+ unsigned int memorystatus_level_snapshot = 0;
+ uint64_t killtime = 0;
+ clock_sec_t tv_sec;
+ clock_usec_t tv_usec;
+ uint32_t tv_msec;
+ os_reason_t jetsam_reason = OS_REASON_NULL;
+ uint64_t footprint_of_killed_proc = 0;
- MEMORYSTATUS_DEBUG(1, "memorystatus_bg_pressure_eligible: pid %d, state 0x%x\n", p->p_pid, p->p_memstat_state);
+ *memory_reclaimed = 0;
- /* Foreground processes have already been dealt with at this point, so just test for eligibility */
- if (!(p->p_memstat_state & (P_MEMSTAT_TERMINATED | P_MEMSTAT_LOCKED | P_MEMSTAT_SUSPENDED | P_MEMSTAT_FROZEN))) {
- eligible = TRUE;
- }
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_START,
+ MEMORYSTATUS_LOG_AVAILABLE_PAGES, priority_max, 0, 0, 0);
- if (p->p_memstat_effectivepriority < JETSAM_PRIORITY_BACKGROUND_OPPORTUNISTIC) {
+ if (priority_max >= JETSAM_PRIORITY_FOREGROUND) {
/*
- * IDLE and IDLE_DEFERRED bands contain processes
- * that have dropped memory to be under their inactive
- * memory limits. And so they can't really give back
- * anything.
+ * Check if aggressive jetsam has been asked to kill upto or beyond the
+ * JETSAM_PRIORITY_FOREGROUND bucket. If yes, sort the FG band based on
+ * coalition footprint.
*/
- eligible = FALSE;
+ memorystatus_sort_bucket(JETSAM_PRIORITY_FOREGROUND, JETSAM_SORT_DEFAULT);
}
- proc_list_unlock();
-
- return eligible;
-}
-
-boolean_t
-memorystatus_is_foreground_locked(proc_t p)
-{
- return (p->p_memstat_effectivepriority == JETSAM_PRIORITY_FOREGROUND) ||
- (p->p_memstat_effectivepriority == JETSAM_PRIORITY_FOREGROUND_SUPPORT);
-}
-
-/*
- * This is meant for stackshot and kperf -- it does not take the proc_list_lock
- * to access the p_memstat_dirty field.
- */
-void
-memorystatus_proc_flags_unsafe(void * v, boolean_t *is_dirty, boolean_t *is_dirty_tracked, boolean_t *allow_idle_exit)
-{
- if (!v) {
- *is_dirty = FALSE;
- *is_dirty_tracked = FALSE;
- *allow_idle_exit = FALSE;
- } else {
- proc_t p = (proc_t)v;
- *is_dirty = (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) != 0;
- *is_dirty_tracked = (p->p_memstat_dirty & P_DIRTY_TRACK) != 0;
- *allow_idle_exit = (p->p_memstat_dirty & P_DIRTY_ALLOW_IDLE_EXIT) != 0;
+ jetsam_reason = os_reason_create(OS_REASON_JETSAM, cause);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("memorystatus_kill_processes_aggressive: failed to allocate exit reason\n");
}
-}
-#endif /* CONFIG_MEMORYSTATUS */
-
-/*
- * Trigger levels to test the mechanism.
- * Can be used via a sysctl.
- */
-#define TEST_LOW_MEMORY_TRIGGER_ONE 1
-#define TEST_LOW_MEMORY_TRIGGER_ALL 2
-#define TEST_PURGEABLE_TRIGGER_ONE 3
-#define TEST_PURGEABLE_TRIGGER_ALL 4
-#define TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ONE 5
-#define TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL 6
-
-boolean_t memorystatus_manual_testing_on = FALSE;
-vm_pressure_level_t memorystatus_manual_testing_level = kVMPressureNormal;
-
-extern struct knote *
-vm_pressure_select_optimal_candidate_to_notify(struct klist *, int, boolean_t);
+ proc_list_lock();
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ while (next_p) {
+ if (((next_p->p_listflag & P_LIST_EXITED) != 0) ||
+ ((unsigned int)(next_p->p_memstat_effectivepriority) != i)) {
+ /*
+ * We have raced with next_p running on another core.
+ * It may be exiting or it may have moved to a different
+ * jetsam priority band. This means we have lost our
+ * place in line while traversing the jetsam list. We
+ * attempt to recover by rewinding to the beginning of the band
+ * we were already traversing. By doing this, we do not guarantee
+ * that no process escapes this aggressive march, but we can make
+ * skipping an entire range of processes less likely. (PR-21069019)
+ */
-#define VM_PRESSURE_NOTIFY_WAIT_PERIOD 10000 /* milliseconds */
+ MEMORYSTATUS_DEBUG(1, "memorystatus: aggressive%d: rewinding band %d, %s(%d) moved or exiting.\n",
+ aggr_count, i, (*next_p->p_name ? next_p->p_name : "unknown"), next_p->p_pid);
-#if DEBUG
-#define VM_PRESSURE_DEBUG(cond, format, ...) \
-do { \
- if (cond) { printf(format, ##__VA_ARGS__); } \
-} while(0)
-#else
-#define VM_PRESSURE_DEBUG(cond, format, ...)
-#endif
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ continue;
+ }
-#define INTER_NOTIFICATION_DELAY (250000) /* .25 second */
+ p = next_p;
+ next_p = memorystatus_get_next_proc_locked(&i, p, TRUE);
-void
-memorystatus_on_pageout_scan_end(void)
-{
- /* No-op */
-}
+ if (p->p_memstat_effectivepriority > priority_max) {
+ /*
+ * Bail out of this killing spree if we have
+ * reached beyond the priority_max jetsam band.
+ * That is, we kill up to and through the
+ * priority_max jetsam band.
+ */
+ proc_list_unlock();
+ goto exit;
+ }
-/*
- * kn_max - knote
- *
- * knote_pressure_level - to check if the knote is registered for this notification level.
- *
- * task - task whose bits we'll be modifying
- *
- * pressure_level_to_clear - if the task has been notified of this past level, clear that notification bit so that if/when we revert to that level, the task will be notified again.
- *
- * pressure_level_to_set - the task is about to be notified of this new level. Update the task's bit notification information appropriately.
- *
- */
+ aPid = p->p_pid;
+ aPid_ep = p->p_memstat_effectivepriority;
-boolean_t
-is_knote_registered_modify_task_pressure_bits(struct knote *kn_max, int knote_pressure_level, task_t task, vm_pressure_level_t pressure_level_to_clear, vm_pressure_level_t pressure_level_to_set)
-{
- if (kn_max->kn_sfflags & knote_pressure_level) {
- if (pressure_level_to_clear && task_has_been_notified(task, pressure_level_to_clear) == TRUE) {
- task_clear_has_been_notified(task, pressure_level_to_clear);
+ if (p->p_memstat_state & (P_MEMSTAT_ERROR | P_MEMSTAT_TERMINATED)) {
+ continue;
}
- task_mark_has_been_notified(task, pressure_level_to_set);
- return TRUE;
- }
+ /*
+ * Capture a snapshot if none exists.
+ */
+ if (memorystatus_jetsam_snapshot_count == 0) {
+ memorystatus_init_jetsam_snapshot_locked(NULL, 0);
+ new_snapshot = TRUE;
+ }
- return FALSE;
-}
+ /*
+ * Mark as terminated so that if exit1() indicates success, but the process (for example)
+ * is blocked in task_exception_notify(), it'll be skipped if encountered again - see
+ * <rdar://problem/13553476>. This is cheaper than examining P_LEXIT, which requires the
+ * acquisition of the proc lock.
+ */
+ p->p_memstat_state |= P_MEMSTAT_TERMINATED;
-void
-memorystatus_klist_reset_all_for_level(vm_pressure_level_t pressure_level_to_clear)
-{
- struct knote *kn = NULL;
+ killtime = mach_absolute_time();
+ absolutetime_to_microtime(killtime, &tv_sec, &tv_usec);
+ tv_msec = tv_usec / 1000;
- memorystatus_klist_lock();
- SLIST_FOREACH(kn, &memorystatus_klist, kn_selnext) {
- proc_t p = PROC_NULL;
- struct task* t = TASK_NULL;
+ /* Shift queue, update stats */
+ memorystatus_update_jetsam_snapshot_entry_locked(p, cause, killtime);
- p = knote_get_kq(kn)->kq_p;
- proc_list_lock();
- if (p != proc_ref_locked(p)) {
- p = PROC_NULL;
- proc_list_unlock();
- continue;
- }
- proc_list_unlock();
+ /*
+ * In order to kill the target process, we will drop the proc_list_lock.
+ * To guaranteee that p and next_p don't disappear out from under the lock,
+ * we must take a ref on both.
+ * If we cannot get a reference, then it's likely we've raced with
+ * that process exiting on another core.
+ */
+ if (proc_ref_locked(p) == p) {
+ if (next_p) {
+ while (next_p && (proc_ref_locked(next_p) != next_p)) {
+ proc_t temp_p;
- t = (struct task *)(p->task);
+ /*
+ * We must have raced with next_p exiting on another core.
+ * Recover by getting the next eligible process in the band.
+ */
- task_clear_has_been_notified(t, pressure_level_to_clear);
+ MEMORYSTATUS_DEBUG(1, "memorystatus: aggressive%d: skipping %d [%s] (exiting?)\n",
+ aggr_count, next_p->p_pid, (*next_p->p_name ? next_p->p_name : "(unknown)"));
- proc_rele(p);
- }
+ temp_p = next_p;
+ next_p = memorystatus_get_next_proc_locked(&i, temp_p, TRUE);
+ }
+ }
+ proc_list_unlock();
- memorystatus_klist_unlock();
-}
+ printf("%lu.%03d memorystatus: %s%d pid %d [%s] (%s %d) - memorystatus_available_pages: %llu\n",
+ (unsigned long)tv_sec, tv_msec,
+ ((aPid_ep == JETSAM_PRIORITY_IDLE) ? "killing_idle_process_aggressive" : "killing_top_process_aggressive"),
+ aggr_count, aPid, (*p->p_name ? p->p_name : "unknown"),
+ memorystatus_kill_cause_name[cause], aPid_ep, (uint64_t)MEMORYSTATUS_LOG_AVAILABLE_PAGES);
-extern kern_return_t vm_pressure_notify_dispatch_vm_clients(boolean_t target_foreground_process);
+ memorystatus_level_snapshot = memorystatus_level;
-struct knote *
-vm_pressure_select_optimal_candidate_to_notify(struct klist *candidate_list, int level, boolean_t target_foreground_process);
+ /*
+ * memorystatus_do_kill() drops a reference, so take another one so we can
+ * continue to use this exit reason even after memorystatus_do_kill()
+ * returns.
+ */
+ os_reason_ref(jetsam_reason);
+ killed = memorystatus_do_kill(p, cause, jetsam_reason, &footprint_of_killed_proc);
-/*
- * Used by the vm_pressure_thread which is
- * signalled from within vm_pageout_scan().
- */
-static void vm_dispatch_memory_pressure(void);
-void consider_vm_pressure_events(void);
+ /* Success? */
+ if (killed) {
+ *memory_reclaimed += footprint_of_killed_proc;
+ proc_rele(p);
+ kill_count++;
+ p = NULL;
+ killed = FALSE;
-void
-consider_vm_pressure_events(void)
-{
- vm_dispatch_memory_pressure();
-}
-static void
-vm_dispatch_memory_pressure(void)
-{
- memorystatus_update_vm_pressure(FALSE);
-}
+ /*
+ * Continue the killing spree.
+ */
+ proc_list_lock();
+ if (next_p) {
+ proc_rele_locked(next_p);
+ }
-extern vm_pressure_level_t
-convert_internal_pressure_level_to_dispatch_level(vm_pressure_level_t);
+ if (aPid_ep == JETSAM_PRIORITY_FOREGROUND && memorystatus_aggressive_jetsam_lenient == TRUE) {
+ if (memorystatus_level > memorystatus_level_snapshot && ((memorystatus_level - memorystatus_level_snapshot) >= AGGRESSIVE_JETSAM_LENIENT_MODE_THRESHOLD)) {
+#if DEVELOPMENT || DEBUG
+ printf("Disabling Lenient mode after one-time deployment.\n");
+#endif /* DEVELOPMENT || DEBUG */
+ memorystatus_aggressive_jetsam_lenient = FALSE;
+ break;
+ }
+ }
-struct knote *
-vm_pressure_select_optimal_candidate_to_notify(struct klist *candidate_list, int level, boolean_t target_foreground_process)
-{
- struct knote *kn = NULL, *kn_max = NULL;
- uint64_t resident_max = 0; /* MB */
- struct timeval curr_tstamp = {0, 0};
- int elapsed_msecs = 0;
- int selected_task_importance = 0;
- static int pressure_snapshot = -1;
- boolean_t pressure_increase = FALSE;
+ continue;
+ }
- if (pressure_snapshot == -1) {
- /*
- * Initial snapshot.
- */
- pressure_snapshot = level;
- pressure_increase = TRUE;
- } else {
- if (level && (level >= pressure_snapshot)) {
- pressure_increase = TRUE;
- } else {
- pressure_increase = FALSE;
+ /*
+ * Failure - first unwind the state,
+ * then fall through to restart the search.
+ */
+ proc_list_lock();
+ proc_rele_locked(p);
+ if (next_p) {
+ proc_rele_locked(next_p);
+ }
+ p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
+ p->p_memstat_state |= P_MEMSTAT_ERROR;
+ *errors += 1;
+ p = NULL;
}
- pressure_snapshot = level;
- }
-
- if (pressure_increase == TRUE) {
- /*
- * We'll start by considering the largest
- * unimportant task in our list.
- */
- selected_task_importance = INT_MAX;
- } else {
/*
- * We'll start by considering the largest
- * important task in our list.
+ * Failure - restart the search at the beginning of
+ * the band we were already traversing.
+ *
+ * We might have raced with "p" exiting on another core, resulting in no
+ * ref on "p". Or, we may have failed to kill "p".
+ *
+ * Either way, we fall thru to here, leaving the proc in the
+ * P_MEMSTAT_TERMINATED or P_MEMSTAT_ERROR state.
+ *
+ * And, we hold the the proc_list_lock at this point.
*/
- selected_task_importance = 0;
+
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
}
- microuptime(&curr_tstamp);
+ proc_list_unlock();
- SLIST_FOREACH(kn, candidate_list, kn_selnext) {
- uint64_t resident_size = 0; /* MB */
- proc_t p = PROC_NULL;
- struct task* t = TASK_NULL;
- int curr_task_importance = 0;
- boolean_t consider_knote = FALSE;
- boolean_t privileged_listener = FALSE;
+exit:
+ os_reason_free(jetsam_reason);
- p = knote_get_kq(kn)->kq_p;
+ /* Clear snapshot if freshly captured and no target was found */
+ if (new_snapshot && (kill_count == 0)) {
proc_list_lock();
- if (p != proc_ref_locked(p)) {
- p = PROC_NULL;
- proc_list_unlock();
- continue;
- }
+ memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
proc_list_unlock();
+ }
-#if CONFIG_MEMORYSTATUS
- if (target_foreground_process == TRUE && !memorystatus_is_foreground_locked(p)) {
- /*
- * Skip process not marked foreground.
- */
- proc_rele(p);
- continue;
- }
-#endif /* CONFIG_MEMORYSTATUS */
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_END,
+ MEMORYSTATUS_LOG_AVAILABLE_PAGES, 0, kill_count, *memory_reclaimed, 0);
+
+ if (kill_count > 0) {
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+static boolean_t
+memorystatus_kill_hiwat_proc(uint32_t *errors, boolean_t *purged, uint64_t *memory_reclaimed)
+{
+ pid_t aPid = 0;
+ proc_t p = PROC_NULL, next_p = PROC_NULL;
+ boolean_t new_snapshot = FALSE, killed = FALSE, freed_mem = FALSE;
+ unsigned int i = 0;
+ uint32_t aPid_ep;
+ os_reason_t jetsam_reason = OS_REASON_NULL;
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM_HIWAT) | DBG_FUNC_START,
+ MEMORYSTATUS_LOG_AVAILABLE_PAGES, 0, 0, 0, 0);
+
+ jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_HIGHWATER);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("memorystatus_kill_hiwat_proc: failed to allocate exit reason\n");
+ }
- t = (struct task *)(p->task);
+ proc_list_lock();
+
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ while (next_p) {
+ uint64_t footprint_in_bytes = 0;
+ uint64_t memlimit_in_bytes = 0;
+ boolean_t skip = 0;
- timevalsub(&curr_tstamp, &p->vm_pressure_last_notify_tstamp);
- elapsed_msecs = curr_tstamp.tv_sec * 1000 + curr_tstamp.tv_usec / 1000;
+ p = next_p;
+ next_p = memorystatus_get_next_proc_locked(&i, p, TRUE);
- vm_pressure_level_t dispatch_level = convert_internal_pressure_level_to_dispatch_level(level);
+ aPid = p->p_pid;
+ aPid_ep = p->p_memstat_effectivepriority;
- if ((kn->kn_sfflags & dispatch_level) == 0) {
- proc_rele(p);
+ if (p->p_memstat_state & (P_MEMSTAT_ERROR | P_MEMSTAT_TERMINATED)) {
continue;
}
-#if CONFIG_MEMORYSTATUS
- if (target_foreground_process == FALSE && !memorystatus_bg_pressure_eligible(p)) {
- VM_PRESSURE_DEBUG(1, "[vm_pressure] skipping process %d\n", p->p_pid);
- proc_rele(p);
+ /* skip if no limit set */
+ if (p->p_memstat_memlimit <= 0) {
continue;
}
-#endif /* CONFIG_MEMORYSTATUS */
-#if CONFIG_EMBEDDED
- curr_task_importance = p->p_memstat_effectivepriority;
-#else /* CONFIG_EMBEDDED */
- curr_task_importance = task_importance_estimate(t);
-#endif /* CONFIG_EMBEDDED */
+ footprint_in_bytes = get_task_phys_footprint(p->task);
+ memlimit_in_bytes = (((uint64_t)p->p_memstat_memlimit) * 1024ULL * 1024ULL); /* convert MB to bytes */
+ skip = (footprint_in_bytes <= memlimit_in_bytes);
- /*
- * Privileged listeners are only considered in the multi-level pressure scheme
- * AND only if the pressure is increasing.
- */
- if (level > 0) {
- if (task_has_been_notified(t, level) == FALSE) {
- /*
- * Is this a privileged listener?
- */
- if (task_low_mem_privileged_listener(t, FALSE, &privileged_listener) == 0) {
- if (privileged_listener) {
- kn_max = kn;
- proc_rele(p);
- goto done_scanning;
- }
- }
+#if CONFIG_FREEZE
+ if (!skip) {
+ if (p->p_memstat_state & P_MEMSTAT_LOCKED) {
+ skip = TRUE;
} else {
- proc_rele(p);
- continue;
- }
- } else if (level == 0) {
- /*
- * Task wasn't notified when the pressure was increasing and so
- * no need to notify it that the pressure is decreasing.
- */
- if ((task_has_been_notified(t, kVMPressureWarning) == FALSE) && (task_has_been_notified(t, kVMPressureCritical) == FALSE)) {
- proc_rele(p);
- continue;
+ skip = FALSE;
}
}
+#endif
- /*
- * We don't want a small process to block large processes from
- * being notified again. <rdar://problem/7955532>
- */
- resident_size = (get_task_phys_footprint(t)) / (1024 * 1024ULL); /* MB */
+ if (skip) {
+ continue;
+ } else {
+ if (memorystatus_jetsam_snapshot_count == 0) {
+ memorystatus_init_jetsam_snapshot_locked(NULL, 0);
+ new_snapshot = TRUE;
+ }
- if (resident_size >= vm_pressure_task_footprint_min) {
- if (level > 0) {
+ if (proc_ref_locked(p) == p) {
/*
- * Warning or Critical Pressure.
+ * Mark as terminated so that if exit1() indicates success, but the process (for example)
+ * is blocked in task_exception_notify(), it'll be skipped if encountered again - see
+ * <rdar://problem/13553476>. This is cheaper than examining P_LEXIT, which requires the
+ * acquisition of the proc lock.
*/
- if (pressure_increase) {
- if ((curr_task_importance < selected_task_importance) ||
- ((curr_task_importance == selected_task_importance) && (resident_size > resident_max))) {
- /*
- * We have found a candidate process which is:
- * a) at a lower importance than the current selected process
- * OR
- * b) has importance equal to that of the current selected process but is larger
- */
-
- consider_knote = TRUE;
- }
- } else {
- if ((curr_task_importance > selected_task_importance) ||
- ((curr_task_importance == selected_task_importance) && (resident_size > resident_max))) {
- /*
- * We have found a candidate process which is:
- * a) at a higher importance than the current selected process
- * OR
- * b) has importance equal to that of the current selected process but is larger
- */
+ p->p_memstat_state |= P_MEMSTAT_TERMINATED;
- consider_knote = TRUE;
- }
- }
- } else if (level == 0) {
+ proc_list_unlock();
+ } else {
/*
- * Pressure back to normal.
+ * We need to restart the search again because
+ * proc_ref_locked _can_ drop the proc_list lock
+ * and we could have lost our stored next_p via
+ * an exit() on another core.
*/
- if ((curr_task_importance > selected_task_importance) ||
- ((curr_task_importance == selected_task_importance) && (resident_size > resident_max))) {
- consider_knote = TRUE;
- }
- }
-
- if (consider_knote) {
- resident_max = resident_size;
- kn_max = kn;
- selected_task_importance = curr_task_importance;
- consider_knote = FALSE; /* reset for the next candidate */
+ i = 0;
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ continue;
}
- } else {
- /* There was no candidate with enough resident memory to scavenge */
- VM_PRESSURE_DEBUG(0, "[vm_pressure] threshold failed for pid %d with %llu resident...\n", p->p_pid, resident_size);
- }
- proc_rele(p);
- }
-
-done_scanning:
- if (kn_max) {
- VM_DEBUG_CONSTANT_EVENT(vm_pressure_event, VM_PRESSURE_EVENT, DBG_FUNC_NONE, knote_get_kq(kn_max)->kq_p->p_pid, resident_max, 0, 0);
- VM_PRESSURE_DEBUG(1, "[vm_pressure] sending event to pid %d with %llu resident\n", knote_get_kq(kn_max)->kq_p->p_pid, resident_max);
- }
-
- return kn_max;
-}
-
-#define VM_PRESSURE_DECREASED_SMOOTHING_PERIOD 5000 /* milliseconds */
-#define WARNING_NOTIFICATION_RESTING_PERIOD 25 /* seconds */
-#define CRITICAL_NOTIFICATION_RESTING_PERIOD 25 /* seconds */
-
-uint64_t next_warning_notification_sent_at_ts = 0;
-uint64_t next_critical_notification_sent_at_ts = 0;
-kern_return_t
-memorystatus_update_vm_pressure(boolean_t target_foreground_process)
-{
- struct knote *kn_max = NULL;
- struct knote *kn_cur = NULL, *kn_temp = NULL; /* for safe list traversal */
- pid_t target_pid = -1;
- struct klist dispatch_klist = { NULL };
- proc_t target_proc = PROC_NULL;
- struct task *task = NULL;
- boolean_t found_candidate = FALSE;
-
- static vm_pressure_level_t level_snapshot = kVMPressureNormal;
- static vm_pressure_level_t prev_level_snapshot = kVMPressureNormal;
- boolean_t smoothing_window_started = FALSE;
- struct timeval smoothing_window_start_tstamp = {0, 0};
- struct timeval curr_tstamp = {0, 0};
- int elapsed_msecs = 0;
- uint64_t curr_ts = mach_absolute_time();
-
-#if !CONFIG_JETSAM
-#define MAX_IDLE_KILLS 100 /* limit the number of idle kills allowed */
+ footprint_in_bytes = 0;
+ freed_mem = memorystatus_kill_proc(p, kMemorystatusKilledHiwat, jetsam_reason, &killed, &footprint_in_bytes); /* purged and/or killed 'p' */
- int idle_kill_counter = 0;
-
- /*
- * On desktop we take this opportunity to free up memory pressure
- * by immediately killing idle exitable processes. We use a delay
- * to avoid overkill. And we impose a max counter as a fail safe
- * in case daemons re-launch too fast.
- */
- while ((memorystatus_vm_pressure_level != kVMPressureNormal) && (idle_kill_counter < MAX_IDLE_KILLS)) {
- if (memorystatus_idle_exit_from_VM() == FALSE) {
- /* No idle exitable processes left to kill */
- break;
- }
- idle_kill_counter++;
+ /* Success? */
+ if (freed_mem) {
+ if (killed == FALSE) {
+ /* purged 'p'..don't reset HWM candidate count */
+ *purged = TRUE;
- if (memorystatus_manual_testing_on == TRUE) {
+ proc_list_lock();
+ p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
+ proc_list_unlock();
+ } else {
+ *memory_reclaimed = footprint_in_bytes;
+ }
+ proc_rele(p);
+ goto exit;
+ }
/*
- * Skip the delay when testing
- * the pressure notification scheme.
+ * Failure - first unwind the state,
+ * then fall through to restart the search.
*/
- } else {
- delay(1000000); /* 1 second */
+ proc_list_lock();
+ proc_rele_locked(p);
+ p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
+ p->p_memstat_state |= P_MEMSTAT_ERROR;
+ *errors += 1;
+
+ i = 0;
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
}
}
-#endif /* !CONFIG_JETSAM */
- if (level_snapshot != kVMPressureNormal) {
- /*
- * Check to see if we are still in the 'resting' period
- * after having notified all clients interested in
- * a particular pressure level.
- */
+ proc_list_unlock();
- level_snapshot = memorystatus_vm_pressure_level;
+exit:
+ os_reason_free(jetsam_reason);
- if (level_snapshot == kVMPressureWarning || level_snapshot == kVMPressureUrgent) {
- if (next_warning_notification_sent_at_ts) {
- if (curr_ts < next_warning_notification_sent_at_ts) {
- delay(INTER_NOTIFICATION_DELAY * 4 /* 1 sec */);
- return KERN_SUCCESS;
- }
+ if (!killed) {
+ *memory_reclaimed = 0;
- next_warning_notification_sent_at_ts = 0;
- memorystatus_klist_reset_all_for_level(kVMPressureWarning);
- }
- } else if (level_snapshot == kVMPressureCritical) {
- if (next_critical_notification_sent_at_ts) {
- if (curr_ts < next_critical_notification_sent_at_ts) {
- delay(INTER_NOTIFICATION_DELAY * 4 /* 1 sec */);
- return KERN_SUCCESS;
- }
- next_critical_notification_sent_at_ts = 0;
- memorystatus_klist_reset_all_for_level(kVMPressureCritical);
- }
+ /* Clear snapshot if freshly captured and no target was found */
+ if (new_snapshot) {
+ proc_list_lock();
+ memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
+ proc_list_unlock();
}
}
- while (1) {
- /*
- * There is a race window here. But it's not clear
- * how much we benefit from having extra synchronization.
- */
- level_snapshot = memorystatus_vm_pressure_level;
-
- if (prev_level_snapshot > level_snapshot) {
- /*
- * Pressure decreased? Let's take a little breather
- * and see if this condition stays.
- */
- if (smoothing_window_started == FALSE) {
- smoothing_window_started = TRUE;
- microuptime(&smoothing_window_start_tstamp);
- }
-
- microuptime(&curr_tstamp);
- timevalsub(&curr_tstamp, &smoothing_window_start_tstamp);
- elapsed_msecs = curr_tstamp.tv_sec * 1000 + curr_tstamp.tv_usec / 1000;
-
- if (elapsed_msecs < VM_PRESSURE_DECREASED_SMOOTHING_PERIOD) {
- delay(INTER_NOTIFICATION_DELAY);
- continue;
- }
- }
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM_HIWAT) | DBG_FUNC_END,
+ MEMORYSTATUS_LOG_AVAILABLE_PAGES, killed ? aPid : 0, killed, *memory_reclaimed, 0);
- prev_level_snapshot = level_snapshot;
- smoothing_window_started = FALSE;
+ return killed;
+}
- memorystatus_klist_lock();
- kn_max = vm_pressure_select_optimal_candidate_to_notify(&memorystatus_klist, level_snapshot, target_foreground_process);
+/*
+ * Jetsam a process pinned in the elevated band.
+ *
+ * Return: true -- a pinned process was jetsammed
+ * false -- no pinned process was jetsammed
+ */
+boolean_t
+memorystatus_kill_elevated_process(uint32_t cause, os_reason_t jetsam_reason, unsigned int band, int aggr_count, uint32_t *errors, uint64_t *memory_reclaimed)
+{
+ pid_t aPid = 0;
+ proc_t p = PROC_NULL, next_p = PROC_NULL;
+ boolean_t new_snapshot = FALSE, killed = FALSE;
+ int kill_count = 0;
+ uint32_t aPid_ep;
+ uint64_t killtime = 0;
+ clock_sec_t tv_sec;
+ clock_usec_t tv_usec;
+ uint32_t tv_msec;
+ uint64_t footprint_of_killed_proc = 0;
- if (kn_max == NULL) {
- memorystatus_klist_unlock();
- /*
- * No more level-based clients to notify.
- *
- * Start the 'resting' window within which clients will not be re-notified.
- */
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_START,
+ MEMORYSTATUS_LOG_AVAILABLE_PAGES, 0, 0, 0, 0);
- if (level_snapshot != kVMPressureNormal) {
- if (level_snapshot == kVMPressureWarning || level_snapshot == kVMPressureUrgent) {
- nanoseconds_to_absolutetime(WARNING_NOTIFICATION_RESTING_PERIOD * NSEC_PER_SEC, &curr_ts);
+#if CONFIG_FREEZE
+ boolean_t consider_frozen_only = FALSE;
- /* Next warning notification (if nothing changes) won't be sent before...*/
- next_warning_notification_sent_at_ts = mach_absolute_time() + curr_ts;
- }
+ if (band == (unsigned int) memorystatus_freeze_jetsam_band) {
+ consider_frozen_only = TRUE;
+ }
+#endif /* CONFIG_FREEZE */
- if (level_snapshot == kVMPressureCritical) {
- nanoseconds_to_absolutetime(CRITICAL_NOTIFICATION_RESTING_PERIOD * NSEC_PER_SEC, &curr_ts);
+ proc_list_lock();
- /* Next critical notification (if nothing changes) won't be sent before...*/
- next_critical_notification_sent_at_ts = mach_absolute_time() + curr_ts;
- }
- }
- return KERN_FAILURE;
- }
+ next_p = memorystatus_get_first_proc_locked(&band, FALSE);
+ while (next_p) {
+ p = next_p;
+ next_p = memorystatus_get_next_proc_locked(&band, p, FALSE);
- target_proc = knote_get_kq(kn_max)->kq_p;
+ aPid = p->p_pid;
+ aPid_ep = p->p_memstat_effectivepriority;
- proc_list_lock();
- if (target_proc != proc_ref_locked(target_proc)) {
- target_proc = PROC_NULL;
- proc_list_unlock();
- memorystatus_klist_unlock();
+ /*
+ * Only pick a process pinned in this elevated band
+ */
+ if (!(p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND)) {
continue;
}
- proc_list_unlock();
-
- target_pid = target_proc->p_pid;
-
- task = (struct task *)(target_proc->task);
-
- if (level_snapshot != kVMPressureNormal) {
- if (level_snapshot == kVMPressureWarning || level_snapshot == kVMPressureUrgent) {
- if (is_knote_registered_modify_task_pressure_bits(kn_max, NOTE_MEMORYSTATUS_PRESSURE_WARN, task, 0, kVMPressureWarning) == TRUE) {
- found_candidate = TRUE;
- }
- } else {
- if (level_snapshot == kVMPressureCritical) {
- if (is_knote_registered_modify_task_pressure_bits(kn_max, NOTE_MEMORYSTATUS_PRESSURE_CRITICAL, task, 0, kVMPressureCritical) == TRUE) {
- found_candidate = TRUE;
- }
- }
- }
- } else {
- if (kn_max->kn_sfflags & NOTE_MEMORYSTATUS_PRESSURE_NORMAL) {
- task_clear_has_been_notified(task, kVMPressureWarning);
- task_clear_has_been_notified(task, kVMPressureCritical);
- found_candidate = TRUE;
- }
+ if (p->p_memstat_state & (P_MEMSTAT_ERROR | P_MEMSTAT_TERMINATED)) {
+ continue;
}
- if (found_candidate == FALSE) {
- proc_rele(target_proc);
- memorystatus_klist_unlock();
+#if CONFIG_FREEZE
+ if (consider_frozen_only && !(p->p_memstat_state & P_MEMSTAT_FROZEN)) {
continue;
}
- SLIST_FOREACH_SAFE(kn_cur, &memorystatus_klist, kn_selnext, kn_temp) {
- int knote_pressure_level = convert_internal_pressure_level_to_dispatch_level(level_snapshot);
-
- if (is_knote_registered_modify_task_pressure_bits(kn_cur, knote_pressure_level, task, 0, level_snapshot) == TRUE) {
- proc_t knote_proc = knote_get_kq(kn_cur)->kq_p;
- pid_t knote_pid = knote_proc->p_pid;
- if (knote_pid == target_pid) {
- KNOTE_DETACH(&memorystatus_klist, kn_cur);
- KNOTE_ATTACH(&dispatch_klist, kn_cur);
- }
- }
+ if (p->p_memstat_state & P_MEMSTAT_LOCKED) {
+ continue;
}
+#endif /* CONFIG_FREEZE */
- KNOTE(&dispatch_klist, (level_snapshot != kVMPressureNormal) ? kMemorystatusPressure : kMemorystatusNoPressure);
+#if DEVELOPMENT || DEBUG
+ MEMORYSTATUS_DEBUG(1, "jetsam: elevated%d process pid %d [%s] - memorystatus_available_pages: %d\n",
+ aggr_count,
+ aPid, (*p->p_name ? p->p_name : "unknown"),
+ MEMORYSTATUS_LOG_AVAILABLE_PAGES);
+#endif /* DEVELOPMENT || DEBUG */
- SLIST_FOREACH_SAFE(kn_cur, &dispatch_klist, kn_selnext, kn_temp) {
- KNOTE_DETACH(&dispatch_klist, kn_cur);
- KNOTE_ATTACH(&memorystatus_klist, kn_cur);
+ if (memorystatus_jetsam_snapshot_count == 0) {
+ memorystatus_init_jetsam_snapshot_locked(NULL, 0);
+ new_snapshot = TRUE;
}
- memorystatus_klist_unlock();
+ p->p_memstat_state |= P_MEMSTAT_TERMINATED;
- microuptime(&target_proc->vm_pressure_last_notify_tstamp);
- proc_rele(target_proc);
+ killtime = mach_absolute_time();
+ absolutetime_to_microtime(killtime, &tv_sec, &tv_usec);
+ tv_msec = tv_usec / 1000;
- if (memorystatus_manual_testing_on == TRUE && target_foreground_process == TRUE) {
- break;
- }
+ memorystatus_update_jetsam_snapshot_entry_locked(p, cause, killtime);
+
+ if (proc_ref_locked(p) == p) {
+ proc_list_unlock();
- if (memorystatus_manual_testing_on == TRUE) {
/*
- * Testing out the pressure notification scheme.
- * No need for delays etc.
+ * memorystatus_do_kill drops a reference, so take another one so we can
+ * continue to use this exit reason even after memorystatus_do_kill()
+ * returns
*/
- } else {
- uint32_t sleep_interval = INTER_NOTIFICATION_DELAY;
-#if CONFIG_JETSAM
- unsigned int page_delta = 0;
- unsigned int skip_delay_page_threshold = 0;
-
- assert(memorystatus_available_pages_pressure >= memorystatus_available_pages_critical_base);
+ os_reason_ref(jetsam_reason);
+ killed = memorystatus_do_kill(p, cause, jetsam_reason, &footprint_of_killed_proc);
- page_delta = (memorystatus_available_pages_pressure - memorystatus_available_pages_critical_base) / 2;
- skip_delay_page_threshold = memorystatus_available_pages_pressure - page_delta;
+ os_log_with_startup_serial(OS_LOG_DEFAULT, "%lu.%03d memorystatus: killing_top_process_elevated%d pid %d [%s] (%s %d) %lluKB - memorystatus_available_pages: %llu\n",
+ (unsigned long)tv_sec, tv_msec,
+ aggr_count,
+ aPid, ((p && *p->p_name) ? p->p_name : "unknown"),
+ memorystatus_kill_cause_name[cause], aPid_ep,
+ footprint_of_killed_proc >> 10, (uint64_t)MEMORYSTATUS_LOG_AVAILABLE_PAGES);
- if (memorystatus_available_pages <= skip_delay_page_threshold) {
- /*
- * We are nearing the critcal mark fast and can't afford to wait between
- * notifications.
- */
- sleep_interval = 0;
+ /* Success? */
+ if (killed) {
+ *memory_reclaimed = footprint_of_killed_proc;
+ proc_rele(p);
+ kill_count++;
+ goto exit;
}
-#endif /* CONFIG_JETSAM */
- if (sleep_interval) {
- delay(sleep_interval);
- }
+ /*
+ * Failure - first unwind the state,
+ * then fall through to restart the search.
+ */
+ proc_list_lock();
+ proc_rele_locked(p);
+ p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
+ p->p_memstat_state |= P_MEMSTAT_ERROR;
+ *errors += 1;
}
- }
-
- return KERN_SUCCESS;
-}
-vm_pressure_level_t
-convert_internal_pressure_level_to_dispatch_level(vm_pressure_level_t internal_pressure_level)
-{
- vm_pressure_level_t dispatch_level = NOTE_MEMORYSTATUS_PRESSURE_NORMAL;
+ /*
+ * Failure - restart the search.
+ *
+ * We might have raced with "p" exiting on another core, resulting in no
+ * ref on "p". Or, we may have failed to kill "p".
+ *
+ * Either way, we fall thru to here, leaving the proc in the
+ * P_MEMSTAT_TERMINATED state or P_MEMSTAT_ERROR state.
+ *
+ * And, we hold the the proc_list_lock at this point.
+ */
- switch (internal_pressure_level) {
- case kVMPressureNormal:
- {
- dispatch_level = NOTE_MEMORYSTATUS_PRESSURE_NORMAL;
- break;
+ next_p = memorystatus_get_first_proc_locked(&band, FALSE);
}
- case kVMPressureWarning:
- case kVMPressureUrgent:
- {
- dispatch_level = NOTE_MEMORYSTATUS_PRESSURE_WARN;
- break;
- }
+ proc_list_unlock();
- case kVMPressureCritical:
- {
- dispatch_level = NOTE_MEMORYSTATUS_PRESSURE_CRITICAL;
- break;
- }
+exit:
+ os_reason_free(jetsam_reason);
- default:
- break;
+ if (kill_count == 0) {
+ *memory_reclaimed = 0;
+
+ /* Clear snapshot if freshly captured and no target was found */
+ if (new_snapshot) {
+ proc_list_lock();
+ memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
+ proc_list_unlock();
+ }
}
- return dispatch_level;
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_END,
+ MEMORYSTATUS_LOG_AVAILABLE_PAGES, killed ? aPid : 0, kill_count, *memory_reclaimed, 0);
+
+ return killed;
}
-static int
-sysctl_memorystatus_vm_pressure_level SYSCTL_HANDLER_ARGS
+static boolean_t
+memorystatus_kill_process_async(pid_t victim_pid, uint32_t cause)
{
-#pragma unused(arg1, arg2, oidp)
-#if CONFIG_EMBEDDED
- int error = 0;
-
- error = priv_check_cred(kauth_cred_get(), PRIV_VM_PRESSURE, 0);
- if (error) {
- return error;
+ /*
+ * TODO: allow a general async path
+ *
+ * NOTE: If a new async kill cause is added, make sure to update memorystatus_thread() to
+ * add the appropriate exit reason code mapping.
+ */
+ if ((victim_pid != -1) ||
+ (cause != kMemorystatusKilledVMPageShortage &&
+ cause != kMemorystatusKilledVMCompressorThrashing &&
+ cause != kMemorystatusKilledVMCompressorSpaceShortage &&
+ cause != kMemorystatusKilledFCThrashing &&
+ cause != kMemorystatusKilledZoneMapExhaustion)) {
+ return FALSE;
}
-#endif /* CONFIG_EMBEDDED */
- vm_pressure_level_t dispatch_level = convert_internal_pressure_level_to_dispatch_level(memorystatus_vm_pressure_level);
-
- return SYSCTL_OUT(req, &dispatch_level, sizeof(dispatch_level));
+ kill_under_pressure_cause = cause;
+ memorystatus_thread_wake();
+ return TRUE;
}
-#if DEBUG || DEVELOPMENT
-
-SYSCTL_PROC(_kern, OID_AUTO, memorystatus_vm_pressure_level, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_LOCKED,
- 0, 0, &sysctl_memorystatus_vm_pressure_level, "I", "");
-
-#else /* DEBUG || DEVELOPMENT */
-
-SYSCTL_PROC(_kern, OID_AUTO, memorystatus_vm_pressure_level, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_LOCKED | CTLFLAG_MASKED,
- 0, 0, &sysctl_memorystatus_vm_pressure_level, "I", "");
-
-#endif /* DEBUG || DEVELOPMENT */
-
-
-static int
-sysctl_memorypressure_manual_trigger SYSCTL_HANDLER_ARGS
+boolean_t
+memorystatus_kill_on_VM_compressor_space_shortage(boolean_t async)
{
-#pragma unused(arg1, arg2)
-
- int level = 0;
- int error = 0;
- int pressure_level = 0;
- int trigger_request = 0;
- int force_purge;
+ if (async) {
+ return memorystatus_kill_process_async(-1, kMemorystatusKilledVMCompressorSpaceShortage);
+ } else {
+ os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_VMCOMPRESSOR_SPACE_SHORTAGE);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("memorystatus_kill_on_VM_compressor_space_shortage -- sync: failed to allocate jetsam reason\n");
+ }
- error = sysctl_handle_int(oidp, &level, 0, req);
- if (error || !req->newptr) {
- return error;
+ return memorystatus_kill_process_sync(-1, kMemorystatusKilledVMCompressorSpaceShortage, jetsam_reason);
}
+}
- memorystatus_manual_testing_on = TRUE;
-
- trigger_request = (level >> 16) & 0xFFFF;
- pressure_level = (level & 0xFFFF);
+#if CONFIG_JETSAM
+boolean_t
+memorystatus_kill_on_VM_compressor_thrashing(boolean_t async)
+{
+ if (async) {
+ return memorystatus_kill_process_async(-1, kMemorystatusKilledVMCompressorThrashing);
+ } else {
+ os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_VMCOMPRESSOR_THRASHING);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("memorystatus_kill_on_VM_compressor_thrashing -- sync: failed to allocate jetsam reason\n");
+ }
- if (trigger_request < TEST_LOW_MEMORY_TRIGGER_ONE ||
- trigger_request > TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL) {
- return EINVAL;
- }
- switch (pressure_level) {
- case NOTE_MEMORYSTATUS_PRESSURE_NORMAL:
- case NOTE_MEMORYSTATUS_PRESSURE_WARN:
- case NOTE_MEMORYSTATUS_PRESSURE_CRITICAL:
- break;
- default:
- return EINVAL;
+ return memorystatus_kill_process_sync(-1, kMemorystatusKilledVMCompressorThrashing, jetsam_reason);
}
+}
- /*
- * The pressure level is being set from user-space.
- * And user-space uses the constants in sys/event.h
- * So we translate those events to our internal levels here.
- */
- if (pressure_level == NOTE_MEMORYSTATUS_PRESSURE_NORMAL) {
- memorystatus_manual_testing_level = kVMPressureNormal;
- force_purge = 0;
- } else if (pressure_level == NOTE_MEMORYSTATUS_PRESSURE_WARN) {
- memorystatus_manual_testing_level = kVMPressureWarning;
- force_purge = vm_pageout_state.memorystatus_purge_on_warning;
- } else if (pressure_level == NOTE_MEMORYSTATUS_PRESSURE_CRITICAL) {
- memorystatus_manual_testing_level = kVMPressureCritical;
- force_purge = vm_pageout_state.memorystatus_purge_on_critical;
- }
-
- memorystatus_vm_pressure_level = memorystatus_manual_testing_level;
-
- /* purge according to the new pressure level */
- switch (trigger_request) {
- case TEST_PURGEABLE_TRIGGER_ONE:
- case TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ONE:
- if (force_purge == 0) {
- /* no purging requested */
- break;
- }
- vm_purgeable_object_purge_one_unlocked(force_purge);
- break;
- case TEST_PURGEABLE_TRIGGER_ALL:
- case TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL:
- if (force_purge == 0) {
- /* no purging requested */
- break;
- }
- while (vm_purgeable_object_purge_one_unlocked(force_purge)) {
- ;
+boolean_t
+memorystatus_kill_on_VM_page_shortage(boolean_t async)
+{
+ if (async) {
+ return memorystatus_kill_process_async(-1, kMemorystatusKilledVMPageShortage);
+ } else {
+ os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_VMPAGESHORTAGE);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("memorystatus_kill_on_VM_page_shortage -- sync: failed to allocate jetsam reason\n");
}
- break;
- }
- if ((trigger_request == TEST_LOW_MEMORY_TRIGGER_ONE) ||
- (trigger_request == TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ONE)) {
- memorystatus_update_vm_pressure(TRUE);
+ return memorystatus_kill_process_sync(-1, kMemorystatusKilledVMPageShortage, jetsam_reason);
}
+}
- if ((trigger_request == TEST_LOW_MEMORY_TRIGGER_ALL) ||
- (trigger_request == TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL)) {
- while (memorystatus_update_vm_pressure(FALSE) == KERN_SUCCESS) {
- continue;
+boolean_t
+memorystatus_kill_on_FC_thrashing(boolean_t async)
+{
+ if (async) {
+ return memorystatus_kill_process_async(-1, kMemorystatusKilledFCThrashing);
+ } else {
+ os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_FCTHRASHING);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("memorystatus_kill_on_FC_thrashing -- sync: failed to allocate jetsam reason\n");
}
+
+ return memorystatus_kill_process_sync(-1, kMemorystatusKilledFCThrashing, jetsam_reason);
}
+}
- if (pressure_level == NOTE_MEMORYSTATUS_PRESSURE_NORMAL) {
- memorystatus_manual_testing_on = FALSE;
+boolean_t
+memorystatus_kill_on_vnode_limit(void)
+{
+ os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_VNODE);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("memorystatus_kill_on_vnode_limit: failed to allocate jetsam reason\n");
}
- return 0;
+ return memorystatus_kill_process_sync(-1, kMemorystatusKilledVnodes, jetsam_reason);
}
-SYSCTL_PROC(_kern, OID_AUTO, memorypressure_manual_trigger, CTLTYPE_INT | CTLFLAG_WR | CTLFLAG_LOCKED | CTLFLAG_MASKED,
- 0, 0, &sysctl_memorypressure_manual_trigger, "I", "");
-
+#endif /* CONFIG_JETSAM */
-SYSCTL_INT(_kern, OID_AUTO, memorystatus_purge_on_warning, CTLFLAG_RW | CTLFLAG_LOCKED, &vm_pageout_state.memorystatus_purge_on_warning, 0, "");
-SYSCTL_INT(_kern, OID_AUTO, memorystatus_purge_on_urgent, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &vm_pageout_state.memorystatus_purge_on_urgent, 0, "");
-SYSCTL_INT(_kern, OID_AUTO, memorystatus_purge_on_critical, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &vm_pageout_state.memorystatus_purge_on_critical, 0, "");
+boolean_t
+memorystatus_kill_on_zone_map_exhaustion(pid_t pid)
+{
+ boolean_t res = FALSE;
+ if (pid == -1) {
+ res = memorystatus_kill_process_async(-1, kMemorystatusKilledZoneMapExhaustion);
+ } else {
+ os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_ZONE_MAP_EXHAUSTION);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("memorystatus_kill_on_zone_map_exhaustion: failed to allocate jetsam reason\n");
+ }
-#if DEBUG || DEVELOPMENT
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_vm_pressure_events_enabled, CTLFLAG_RW | CTLFLAG_LOCKED, &vm_pressure_events_enabled, 0, "");
-#endif
+ res = memorystatus_kill_process_sync(pid, kMemorystatusKilledZoneMapExhaustion, jetsam_reason);
+ }
+ return res;
+}
-#endif /* VM_PRESSURE_EVENTS */
+void
+memorystatus_on_pageout_scan_end(void)
+{
+ /* No-op */
+}
/* Return both allocated and actual size, since there's a race between allocation and list compilation */
static int
return EINVAL;
}
- *list_ptr = (memorystatus_priority_entry_t*)kalloc(*list_size);
+ *list_ptr = kheap_alloc(KHEAP_TEMP, *list_size, Z_WAITOK | Z_ZERO);
if (!*list_ptr) {
return ENOMEM;
}
- memset(*list_ptr, 0, *list_size);
-
*buffer_size = *list_size;
*list_size = 0;
{
int error = 0;
memorystatus_priority_entry_t mp_entry;
+ kern_return_t ret;
/* Validate inputs */
if ((pid == 0) || (buffer == USER_ADDR_NULL) || (buffer_size != sizeof(memorystatus_priority_entry_t))) {
mp_entry.priority = p->p_memstat_effectivepriority;
mp_entry.user_data = p->p_memstat_userdata;
if (p->p_memstat_memlimit <= 0) {
- task_get_phys_footprint_limit(p->task, &mp_entry.limit);
+ ret = task_get_phys_footprint_limit(p->task, &mp_entry.limit);
+ if (ret != KERN_SUCCESS) {
+ proc_rele(p);
+ return EINVAL;
+ }
} else {
mp_entry.limit = p->p_memstat_memlimit;
}
}
if (list) {
- kfree(list, buffer_size);
+ kheap_free(KHEAP_TEMP, list, buffer_size);
}
}
if (error == 0) {
- *retval = list_size;
+ assert(list_size <= INT32_MAX);
+ *retval = (int32_t) list_size;
}
return error;
}
}
-#if DEBUG || DEVELOPMENT
- if (memorystatus_jetsam_policy & kPolicyDiagnoseActive) {
- memorystatus_available_pages_critical += memorystatus_jetsam_policy_offset_pages_diagnostic;
-
- if (memorystatus_available_pages_critical > memorystatus_available_pages_pressure) {
- /*
- * The critical threshold must never exceed the pressure threshold
- */
- memorystatus_available_pages_critical = memorystatus_available_pages_pressure;
- }
- }
-#endif /* DEBUG || DEVELOPMENT */
-
if (memorystatus_jetsam_policy & kPolicyMoreFree) {
memorystatus_available_pages_critical += memorystatus_policy_more_free_offset_pages;
}
}
#if VM_PRESSURE_EVENTS
- memorystatus_available_pages_pressure = (pressure_threshold_percentage / delta_percentage) * memorystatus_delta;
-#if DEBUG || DEVELOPMENT
- if (memorystatus_jetsam_policy & kPolicyDiagnoseActive) {
- memorystatus_available_pages_pressure += memorystatus_jetsam_policy_offset_pages_diagnostic;
- }
-#endif
+ memorystatus_available_pages_pressure = (int32_t)(pressure_threshold_percentage * (atop_64(max_mem) / 100));
#endif
}
memorystatus_at_boot_snapshot.notification_time = mach_absolute_time();
*snapshot = &memorystatus_at_boot_snapshot;
- MEMORYSTATUS_DEBUG(7, "memorystatus_get_at_boot_snapshot: returned inputsize (%ld), snapshot_size(%ld), listcount(%d)\n",
- (long)input_size, (long)*snapshot_size, 0);
+ MEMORYSTATUS_DEBUG(7, "memorystatus_get_at_boot_snapshot: returned inputsize (%ld), snapshot_size(%ld), listcount(%d)\n",
+ (long)input_size, (long)*snapshot_size, 0);
+ return 0;
+}
+
+/*
+ * Get the previous fully populated snapshot
+ */
+static int
+memorystatus_get_jetsam_snapshot_copy(memorystatus_jetsam_snapshot_t **snapshot, size_t *snapshot_size, boolean_t size_only)
+{
+ size_t input_size = *snapshot_size;
+
+ if (memorystatus_jetsam_snapshot_copy_count > 0) {
+ *snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) + (sizeof(memorystatus_jetsam_snapshot_entry_t) * (memorystatus_jetsam_snapshot_copy_count));
+ } else {
+ *snapshot_size = 0;
+ }
+
+ if (size_only) {
+ return 0;
+ }
+
+ if (input_size < *snapshot_size) {
+ return EINVAL;
+ }
+
+ *snapshot = memorystatus_jetsam_snapshot_copy;
+
+ MEMORYSTATUS_DEBUG(7, "memorystatus_get_jetsam_snapshot_copy: returned inputsize (%ld), snapshot_size(%ld), listcount(%ld)\n",
+ (long)input_size, (long)*snapshot_size, (long)memorystatus_jetsam_snapshot_copy_count);
+
return 0;
}
-/*
- * Get the previous fully populated snapshot
- */
+#if CONFIG_FREEZE
static int
-memorystatus_get_jetsam_snapshot_copy(memorystatus_jetsam_snapshot_t **snapshot, size_t *snapshot_size, boolean_t size_only)
+memorystatus_get_jetsam_snapshot_freezer(memorystatus_jetsam_snapshot_t **snapshot, size_t *snapshot_size, boolean_t size_only)
{
size_t input_size = *snapshot_size;
- if (memorystatus_jetsam_snapshot_copy_count > 0) {
- *snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) + (sizeof(memorystatus_jetsam_snapshot_entry_t) * (memorystatus_jetsam_snapshot_copy_count));
+ if (memorystatus_jetsam_snapshot_freezer->entry_count > 0) {
+ *snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) + (sizeof(memorystatus_jetsam_snapshot_entry_t) * (memorystatus_jetsam_snapshot_freezer->entry_count));
} else {
*snapshot_size = 0;
}
+ assert(*snapshot_size <= memorystatus_jetsam_snapshot_freezer_size);
if (size_only) {
return 0;
return EINVAL;
}
- *snapshot = memorystatus_jetsam_snapshot_copy;
+ *snapshot = memorystatus_jetsam_snapshot_freezer;
- MEMORYSTATUS_DEBUG(7, "memorystatus_get_jetsam_snapshot_copy: returned inputsize (%ld), snapshot_size(%ld), listcount(%ld)\n",
- (long)input_size, (long)*snapshot_size, (long)memorystatus_jetsam_snapshot_copy_count);
+ MEMORYSTATUS_DEBUG(7, "memorystatus_get_jetsam_snapshot_freezer: returned inputsize (%ld), snapshot_size(%ld), listcount(%ld)\n",
+ (long)input_size, (long)*snapshot_size, (long)memorystatus_jetsam_snapshot_freezer->entry_count);
return 0;
}
+#endif /* CONFIG_FREEZE */
static int
memorystatus_get_on_demand_snapshot(memorystatus_jetsam_snapshot_t **snapshot, size_t *snapshot_size, boolean_t size_only)
/*
* Allocate and initialize a snapshot buffer.
*/
- ods = (memorystatus_jetsam_snapshot_t *)kalloc(*snapshot_size);
+ ods = kalloc(*snapshot_size);
if (!ods) {
return ENOMEM;
}
boolean_t is_default_snapshot = FALSE;
boolean_t is_on_demand_snapshot = FALSE;
boolean_t is_at_boot_snapshot = FALSE;
+#if CONFIG_FREEZE
+ bool is_freezer_snapshot = false;
+#endif /* CONFIG_FREEZE */
memorystatus_jetsam_snapshot_t *snapshot;
size_only = ((buffer == USER_ADDR_NULL) ? TRUE : FALSE);
is_default_snapshot = TRUE;
error = memorystatus_get_jetsam_snapshot(&snapshot, &buffer_size, size_only);
} else {
- if (flags & ~(MEMORYSTATUS_SNAPSHOT_ON_DEMAND | MEMORYSTATUS_SNAPSHOT_AT_BOOT | MEMORYSTATUS_SNAPSHOT_COPY)) {
+ if (flags & ~(MEMORYSTATUS_SNAPSHOT_ON_DEMAND | MEMORYSTATUS_SNAPSHOT_AT_BOOT | MEMORYSTATUS_SNAPSHOT_COPY | MEMORYSTATUS_FLAGS_SNAPSHOT_FREEZER)) {
/*
* Unsupported bit set in flag.
*/
error = memorystatus_get_at_boot_snapshot(&snapshot, &buffer_size, size_only);
} else if (flags & MEMORYSTATUS_SNAPSHOT_COPY) {
error = memorystatus_get_jetsam_snapshot_copy(&snapshot, &buffer_size, size_only);
+#if CONFIG_FREEZE
+ } else if (flags & MEMORYSTATUS_FLAGS_SNAPSHOT_FREEZER) {
+ is_freezer_snapshot = true;
+ error = memorystatus_get_jetsam_snapshot_freezer(&snapshot, &buffer_size, size_only);
+#endif /* CONFIG_FREEZE */
} else {
/*
* Invalid flag setting.
* there is nothing to clear or update.
* If working with a copy of the snapshot
* there is nothing to clear or update.
+ * If working with the freezer snapshot
+ * clearing the buffer means, reset the count.
*/
if (!size_only) {
if ((error = copyout(snapshot, buffer, buffer_size)) == 0) {
+#if CONFIG_FREEZE
+ if (is_default_snapshot || is_freezer_snapshot) {
+#else
if (is_default_snapshot) {
+#endif /* CONFIG_FREEZE */
/*
* The jetsam snapshot is never freed, its count is simply reset.
* However, we make a copy for any parties that might be interested
* in the previous fully populated snapshot.
*/
proc_list_lock();
- memcpy(memorystatus_jetsam_snapshot_copy, memorystatus_jetsam_snapshot, memorystatus_jetsam_snapshot_size);
- memorystatus_jetsam_snapshot_copy_count = memorystatus_jetsam_snapshot_count;
- snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
- memorystatus_jetsam_snapshot_last_timestamp = 0;
+#if DEVELOPMENT || DEBUG
+ if (memorystatus_snapshot_owner != 0 && memorystatus_snapshot_owner != current_proc()->p_pid) {
+ /* Snapshot is currently owned by someone else. Don't consume it. */
+ proc_list_unlock();
+ goto out;
+ }
+#endif /* (DEVELOPMENT || DEBUG)*/
+ if (is_default_snapshot) {
+ memcpy(memorystatus_jetsam_snapshot_copy, memorystatus_jetsam_snapshot, memorystatus_jetsam_snapshot_size);
+ memorystatus_jetsam_snapshot_copy_count = memorystatus_jetsam_snapshot_count;
+ snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
+ memorystatus_jetsam_snapshot_last_timestamp = 0;
+ }
+#if CONFIG_FREEZE
+ else if (is_freezer_snapshot) {
+ memorystatus_jetsam_snapshot_freezer->entry_count = 0;
+ }
+#endif /* CONFIG_FREEZE */
proc_list_unlock();
}
}
}
}
+out:
if (error == 0) {
- *retval = buffer_size;
+ assert(buffer_size <= INT32_MAX);
+ *retval = (int32_t) buffer_size;
}
-out:
return error;
}
+#if DEVELOPMENT || DEBUG
+static int
+memorystatus_cmd_set_jetsam_snapshot_ownership(int32_t flags)
+{
+ int error = EINVAL;
+ proc_t caller = current_proc();
+ assert(caller != kernproc);
+ proc_list_lock();
+ if (flags & MEMORYSTATUS_FLAGS_SNAPSHOT_TAKE_OWNERSHIP) {
+ if (memorystatus_snapshot_owner == 0) {
+ memorystatus_snapshot_owner = caller->p_pid;
+ error = 0;
+ } else if (memorystatus_snapshot_owner == caller->p_pid) {
+ error = 0;
+ } else {
+ /* We don't allow ownership to be taken from another proc. */
+ error = EBUSY;
+ }
+ } else if (flags & MEMORYSTATUS_FLAGS_SNAPSHOT_DROP_OWNERSHIP) {
+ if (memorystatus_snapshot_owner == caller->p_pid) {
+ memorystatus_snapshot_owner = 0;
+ error = 0;
+ } else if (memorystatus_snapshot_owner != 0) {
+ /* We don't allow ownership to be taken from another proc. */
+ error = EPERM;
+ }
+ }
+ proc_list_unlock();
+
+ return error;
+}
+#endif /* DEVELOPMENT || DEBUG */
+
/*
* Routine: memorystatus_cmd_grp_set_priorities
* Purpose: Update priorities for a group of processes.
int error = 0;
memorystatus_properties_entry_v1_t *entries = NULL;
- uint32_t entry_count = 0;
+ size_t entry_count = 0;
/* This will be the ordered proc list */
typedef struct memorystatus_internal_properties {
size_t table_size = 0;
uint32_t table_count = 0;
- uint32_t i = 0;
+ size_t i = 0;
uint32_t bucket_index = 0;
boolean_t head_insert;
int32_t new_priority;
}
entry_count = (buffer_size / sizeof(memorystatus_properties_entry_v1_t));
- if ((entries = (memorystatus_properties_entry_v1_t *)kalloc(buffer_size)) == NULL) {
+ if (entry_count == 0) {
+ /* buffer size was not large enough for a single entry */
+ error = EINVAL;
+ goto out;
+ }
+
+ if ((entries = kheap_alloc(KHEAP_TEMP, buffer_size, Z_WAITOK)) == NULL) {
error = ENOMEM;
goto out;
}
}
table_size = sizeof(memorystatus_internal_properties_t) * entry_count;
- if ((table = (memorystatus_internal_properties_t *)kalloc(table_size)) == NULL) {
+ if ((table = kheap_alloc(KHEAP_TEMP, table_size, Z_WAITOK | Z_ZERO)) == NULL) {
error = ENOMEM;
goto out;
}
- memset(table, 0, table_size);
/*
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_GRP_SET_PROP) | DBG_FUNC_END, MEMORYSTATUS_FLAGS_GRP_SET_PRIORITY, entry_count, table_count, 0, 0);
if (entries) {
- kfree(entries, buffer_size);
+ kheap_free(KHEAP_TEMP, entries, buffer_size);
}
if (table) {
- kfree(table, table_size);
+ kheap_free(KHEAP_TEMP, table, table_size);
}
return error;
}
+memorystatus_internal_probabilities_t *memorystatus_global_probabilities_table = NULL;
+size_t memorystatus_global_probabilities_size = 0;
+
static int
memorystatus_cmd_grp_set_probabilities(user_addr_t buffer, size_t buffer_size)
{
int error = 0;
memorystatus_properties_entry_v1_t *entries = NULL;
- uint32_t entry_count = 0, i = 0;
+ size_t entry_count = 0, i = 0;
memorystatus_internal_probabilities_t *tmp_table_new = NULL, *tmp_table_old = NULL;
size_t tmp_table_new_size = 0, tmp_table_old_size = 0;
entry_count = (buffer_size / sizeof(memorystatus_properties_entry_v1_t));
- if ((entries = (memorystatus_properties_entry_v1_t *) kalloc(buffer_size)) == NULL) {
+ if ((entries = kheap_alloc(KHEAP_TEMP, buffer_size, Z_WAITOK)) == NULL) {
error = ENOMEM;
goto out;
}
tmp_table_new_size = sizeof(memorystatus_internal_probabilities_t) * entry_count;
- if ((tmp_table_new = (memorystatus_internal_probabilities_t *) kalloc(tmp_table_new_size)) == NULL) {
+ if ((tmp_table_new = kalloc_flags(tmp_table_new_size, Z_WAITOK | Z_ZERO)) == NULL) {
error = ENOMEM;
goto out;
}
- memset(tmp_table_new, 0, tmp_table_new_size);
proc_list_lock();
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_GRP_SET_PROP) | DBG_FUNC_END, MEMORYSTATUS_FLAGS_GRP_SET_PROBABILITY, entry_count, tmp_table_new_size, 0, 0);
if (entries) {
- kfree(entries, buffer_size);
+ kheap_free(KHEAP_TEMP, entries, buffer_size);
entries = NULL;
}
* This routine is used to update a process's jetsam priority position and stored user_data.
* It is not used for the setting of memory limits, which is why the last 6 args to the
* memorystatus_update() call are 0 or FALSE.
+ *
+ * Flags passed into this call are used to distinguish the motivation behind a jetsam priority
+ * transition. By default, the kernel updates the process's original requested priority when
+ * no flag is passed. But when the MEMORYSTATUS_SET_PRIORITY_ASSERTION flag is used, the kernel
+ * updates the process's assertion driven priority.
+ *
+ * The assertion flag was introduced for use by the device's assertion mediator (eg: runningboardd).
+ * When an assertion is controlling a process's jetsam priority, it may conflict with that process's
+ * dirty/clean (active/inactive) jetsam state. The kernel attempts to resolve a priority transition
+ * conflict by reviewing the process state and then choosing the maximum jetsam band at play,
+ * eg: requested priority versus assertion priority.
*/
static int
-memorystatus_cmd_set_priority_properties(pid_t pid, user_addr_t buffer, size_t buffer_size, __unused int32_t *retval)
+memorystatus_cmd_set_priority_properties(pid_t pid, uint32_t flags, user_addr_t buffer, size_t buffer_size, __unused int32_t *retval)
{
int error = 0;
+ boolean_t is_assertion = FALSE; /* priority is driven by an assertion */
memorystatus_priority_properties_t mpp_entry;
/* Validate inputs */
return EINVAL;
}
+ /* Validate flags */
+ if (flags == 0) {
+ /*
+ * Default. This path updates requestedpriority.
+ */
+ } else {
+ if (flags & ~(MEMORYSTATUS_SET_PRIORITY_ASSERTION)) {
+ /*
+ * Unsupported bit set in flag.
+ */
+ return EINVAL;
+ } else if (flags & MEMORYSTATUS_SET_PRIORITY_ASSERTION) {
+ is_assertion = TRUE;
+ }
+ }
+
error = copyin(buffer, &mpp_entry, buffer_size);
if (error == 0) {
return EPERM;
}
- error = memorystatus_update(p, mpp_entry.priority, mpp_entry.user_data, FALSE, FALSE, 0, 0, FALSE, FALSE);
+ if (is_assertion) {
+ os_log(OS_LOG_DEFAULT, "memorystatus: set assertion priority(%d) target %s:%d\n",
+ mpp_entry.priority, (*p->p_name ? p->p_name : "unknown"), p->p_pid);
+ }
+
+ error = memorystatus_update(p, mpp_entry.priority, mpp_entry.user_data, is_assertion, FALSE, FALSE, 0, 0, FALSE, FALSE);
proc_rele(p);
}
return error;
}
+static void
+memorystatus_get_memlimit_properties_internal(proc_t p, memorystatus_memlimit_properties_t* p_entry)
+{
+ memset(p_entry, 0, sizeof(memorystatus_memlimit_properties_t));
+
+ if (p->p_memstat_memlimit_active > 0) {
+ p_entry->memlimit_active = p->p_memstat_memlimit_active;
+ } else {
+ task_convert_phys_footprint_limit(-1, &p_entry->memlimit_active);
+ }
+
+ if (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_ACTIVE_FATAL) {
+ p_entry->memlimit_active_attr |= MEMORYSTATUS_MEMLIMIT_ATTR_FATAL;
+ }
+
+ /*
+ * Get the inactive limit and attributes
+ */
+ if (p->p_memstat_memlimit_inactive <= 0) {
+ task_convert_phys_footprint_limit(-1, &p_entry->memlimit_inactive);
+ } else {
+ p_entry->memlimit_inactive = p->p_memstat_memlimit_inactive;
+ }
+ if (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_INACTIVE_FATAL) {
+ p_entry->memlimit_inactive_attr |= MEMORYSTATUS_MEMLIMIT_ATTR_FATAL;
+ }
+}
+
/*
* When getting the memlimit settings, we can't simply call task_get_phys_footprint_limit().
* That gets the proc's cached memlimit and there is no guarantee that the active/inactive
static int
memorystatus_cmd_get_memlimit_properties(pid_t pid, user_addr_t buffer, size_t buffer_size, __unused int32_t *retval)
{
- int error = 0;
- memorystatus_memlimit_properties_t mmp_entry;
+ memorystatus_memlimit_properties2_t mmp_entry;
/* Validate inputs */
- if ((pid == 0) || (buffer == USER_ADDR_NULL) || (buffer_size != sizeof(memorystatus_memlimit_properties_t))) {
+ if ((pid == 0) || (buffer == USER_ADDR_NULL) ||
+ ((buffer_size != sizeof(memorystatus_memlimit_properties_t)) &&
+ (buffer_size != sizeof(memorystatus_memlimit_properties2_t)))) {
return EINVAL;
}
- memset(&mmp_entry, 0, sizeof(memorystatus_memlimit_properties_t));
+ memset(&mmp_entry, 0, sizeof(memorystatus_memlimit_properties2_t));
proc_t p = proc_find(pid);
if (!p) {
* No locks taken since we hold a reference to the proc.
*/
- if (p->p_memstat_memlimit_active > 0) {
- mmp_entry.memlimit_active = p->p_memstat_memlimit_active;
- } else {
- task_convert_phys_footprint_limit(-1, &mmp_entry.memlimit_active);
- }
-
- if (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_ACTIVE_FATAL) {
- mmp_entry.memlimit_active_attr |= MEMORYSTATUS_MEMLIMIT_ATTR_FATAL;
- }
+ memorystatus_get_memlimit_properties_internal(p, &mmp_entry.v1);
+#if CONFIG_JETSAM
+#if DEVELOPMENT || DEBUG
/*
- * Get the inactive limit and attributes
+ * Get the limit increased via SPI
*/
- if (p->p_memstat_memlimit_inactive <= 0) {
- task_convert_phys_footprint_limit(-1, &mmp_entry.memlimit_inactive);
- } else {
- mmp_entry.memlimit_inactive = p->p_memstat_memlimit_inactive;
- }
- if (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_INACTIVE_FATAL) {
- mmp_entry.memlimit_inactive_attr |= MEMORYSTATUS_MEMLIMIT_ATTR_FATAL;
- }
+ mmp_entry.memlimit_increase = roundToNearestMB(p->p_memlimit_increase);
+ mmp_entry.memlimit_increase_bytes = p->p_memlimit_increase;
+#endif /* DEVELOPMENT || DEBUG */
+#endif /* CONFIG_JETSAM */
+
proc_rele(p);
- error = copyout(&mmp_entry, buffer, buffer_size);
+ int error = copyout(&mmp_entry, buffer, buffer_size);
return error;
}
#endif /* CONFIG_JETSAM */
static int
-memorystatus_set_memlimit_properties(pid_t pid, memorystatus_memlimit_properties_t *entry)
+memorystatus_set_memlimit_properties_internal(proc_t p, memorystatus_memlimit_properties_t *p_entry)
{
- int32_t memlimit_active;
- boolean_t memlimit_active_is_fatal;
- int32_t memlimit_inactive;
- boolean_t memlimit_inactive_is_fatal;
- uint32_t valid_attrs = 0;
- int error = 0;
-
- proc_t p = proc_find(pid);
- if (!p) {
- return ESRCH;
- }
-
- /*
- * Check for valid attribute flags.
- */
- valid_attrs |= (MEMORYSTATUS_MEMLIMIT_ATTR_FATAL);
- if ((entry->memlimit_active_attr & (~valid_attrs)) != 0) {
- proc_rele(p);
- return EINVAL;
- }
- if ((entry->memlimit_inactive_attr & (~valid_attrs)) != 0) {
- proc_rele(p);
- return EINVAL;
- }
-
- /*
- * Setup the active memlimit properties
- */
- memlimit_active = entry->memlimit_active;
- if (entry->memlimit_active_attr & MEMORYSTATUS_MEMLIMIT_ATTR_FATAL) {
- memlimit_active_is_fatal = TRUE;
- } else {
- memlimit_active_is_fatal = FALSE;
- }
-
- /*
- * Setup the inactive memlimit properties
- */
- memlimit_inactive = entry->memlimit_inactive;
- if (entry->memlimit_inactive_attr & MEMORYSTATUS_MEMLIMIT_ATTR_FATAL) {
- memlimit_inactive_is_fatal = TRUE;
- } else {
- memlimit_inactive_is_fatal = FALSE;
- }
-
- /*
- * Setting a limit of <= 0 implies that the process has no
- * high-water-mark and has no per-task-limit. That means
- * the system_wide task limit is in place, which by the way,
- * is always fatal.
- */
-
- if (memlimit_active <= 0) {
- /*
- * Enforce the fatal system_wide task limit while process is active.
- */
- memlimit_active = -1;
- memlimit_active_is_fatal = TRUE;
- }
-
- if (memlimit_inactive <= 0) {
- /*
- * Enforce the fatal system_wide task limit while process is inactive.
- */
- memlimit_inactive = -1;
- memlimit_inactive_is_fatal = TRUE;
- }
+ int error = 0;
- proc_list_lock();
+ LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED);
/*
* Store the active limit variants in the proc.
*/
- SET_ACTIVE_LIMITS_LOCKED(p, memlimit_active, memlimit_active_is_fatal);
+ SET_ACTIVE_LIMITS_LOCKED(p, p_entry->memlimit_active, p_entry->memlimit_active_attr);
/*
* Store the inactive limit variants in the proc.
*/
- SET_INACTIVE_LIMITS_LOCKED(p, memlimit_inactive, memlimit_inactive_is_fatal);
+ SET_INACTIVE_LIMITS_LOCKED(p, p_entry->memlimit_inactive, p_entry->memlimit_inactive_attr);
/*
* Enforce appropriate limit variant by updating the cached values
DTRACE_MEMORYSTATUS2(memorystatus_set_memlimit, proc_t, p, int32_t, (p->p_memstat_memlimit > 0 ? p->p_memstat_memlimit : -1));
}
- proc_list_unlock();
- proc_rele(p);
-
return error;
}
-/*
- * Returns the jetsam priority (effective or requested) of the process
- * associated with this task.
- */
-int
-proc_get_memstat_priority(proc_t p, boolean_t effective_priority)
-{
- if (p) {
- if (effective_priority) {
- return p->p_memstat_effectivepriority;
- } else {
- return p->p_memstat_requestedpriority;
- }
- }
- return 0;
-}
-
static int
-memorystatus_get_process_is_managed(pid_t pid, int *is_managed)
+memorystatus_set_memlimit_properties(pid_t pid, memorystatus_memlimit_properties_t *entry)
{
- proc_t p = NULL;
+ memorystatus_memlimit_properties_t set_entry;
- /* Validate inputs */
- if (pid == 0) {
- return EINVAL;
- }
-
- p = proc_find(pid);
+ proc_t p = proc_find(pid);
if (!p) {
return ESRCH;
}
- proc_list_lock();
- *is_managed = ((p->p_memstat_state & P_MEMSTAT_MANAGED) ? 1 : 0);
- proc_rele_locked(p);
- proc_list_unlock();
+ /*
+ * Check for valid attribute flags.
+ */
+ const uint32_t valid_attrs = MEMORYSTATUS_MEMLIMIT_ATTR_FATAL;
+ if ((entry->memlimit_active_attr & (~valid_attrs)) != 0) {
+ proc_rele(p);
+ return EINVAL;
+ }
+ if ((entry->memlimit_inactive_attr & (~valid_attrs)) != 0) {
+ proc_rele(p);
+ return EINVAL;
+ }
- return 0;
-}
+ /*
+ * Setup the active memlimit properties
+ */
+ set_entry.memlimit_active = entry->memlimit_active;
+ set_entry.memlimit_active_attr = entry->memlimit_active_attr & MEMORYSTATUS_MEMLIMIT_ATTR_FATAL;
-static int
-memorystatus_set_process_is_managed(pid_t pid, boolean_t set_managed)
-{
- proc_t p = NULL;
+ /*
+ * Setup the inactive memlimit properties
+ */
+ set_entry.memlimit_inactive = entry->memlimit_inactive;
+ set_entry.memlimit_inactive_attr = entry->memlimit_inactive_attr & MEMORYSTATUS_MEMLIMIT_ATTR_FATAL;
- /* Validate inputs */
- if (pid == 0) {
- return EINVAL;
+ /*
+ * Setting a limit of <= 0 implies that the process has no
+ * high-water-mark and has no per-task-limit. That means
+ * the system_wide task limit is in place, which by the way,
+ * is always fatal.
+ */
+
+ if (set_entry.memlimit_active <= 0) {
+ /*
+ * Enforce the fatal system_wide task limit while process is active.
+ */
+ set_entry.memlimit_active = -1;
+ set_entry.memlimit_active_attr = MEMORYSTATUS_MEMLIMIT_ATTR_FATAL;
+ }
+#if CONFIG_JETSAM
+#if DEVELOPMENT || DEBUG
+ else {
+ /* add the current increase to it, for roots */
+ set_entry.memlimit_active += roundToNearestMB(p->p_memlimit_increase);
}
+#endif /* DEVELOPMENT || DEBUG */
+#endif /* CONFIG_JETSAM */
- p = proc_find(pid);
- if (!p) {
- return ESRCH;
+ if (set_entry.memlimit_inactive <= 0) {
+ /*
+ * Enforce the fatal system_wide task limit while process is inactive.
+ */
+ set_entry.memlimit_inactive = -1;
+ set_entry.memlimit_inactive_attr = MEMORYSTATUS_MEMLIMIT_ATTR_FATAL;
+ }
+#if CONFIG_JETSAM
+#if DEVELOPMENT || DEBUG
+ else {
+ /* add the current increase to it, for roots */
+ set_entry.memlimit_inactive += roundToNearestMB(p->p_memlimit_increase);
}
+#endif /* DEVELOPMENT || DEBUG */
+#endif /* CONFIG_JETSAM */
proc_list_lock();
- if (set_managed == TRUE) {
- p->p_memstat_state |= P_MEMSTAT_MANAGED;
- } else {
- p->p_memstat_state &= ~P_MEMSTAT_MANAGED;
- }
- proc_rele_locked(p);
+
+ int error = memorystatus_set_memlimit_properties_internal(p, &set_entry);
+
proc_list_unlock();
+ proc_rele(p);
+ return error;
+}
+
+/*
+ * Returns the jetsam priority (effective or requested) of the process
+ * associated with this task.
+ */
+int
+proc_get_memstat_priority(proc_t p, boolean_t effective_priority)
+{
+ if (p) {
+ if (effective_priority) {
+ return p->p_memstat_effectivepriority;
+ } else {
+ return p->p_memstat_requestedpriority;
+ }
+ }
return 0;
}
static int
-memorystatus_get_process_is_freezable(pid_t pid, int *is_freezable)
+memorystatus_get_process_is_managed(pid_t pid, int *is_managed)
{
- proc_t p = PROC_NULL;
+ proc_t p = NULL;
+ /* Validate inputs */
if (pid == 0) {
return EINVAL;
}
return ESRCH;
}
- /*
- * Only allow this on the current proc for now.
- * We can check for privileges and allow targeting another process in the future.
- */
- if (p != current_proc()) {
- proc_rele(p);
- return EPERM;
- }
-
proc_list_lock();
- *is_freezable = ((p->p_memstat_state & P_MEMSTAT_FREEZE_DISABLED) ? 0 : 1);
+ *is_managed = ((p->p_memstat_state & P_MEMSTAT_MANAGED) ? 1 : 0);
proc_rele_locked(p);
proc_list_unlock();
}
static int
-memorystatus_set_process_is_freezable(pid_t pid, boolean_t is_freezable)
+memorystatus_set_process_is_managed(pid_t pid, boolean_t set_managed)
{
- proc_t p = PROC_NULL;
+ proc_t p = NULL;
+ /* Validate inputs */
if (pid == 0) {
return EINVAL;
}
return ESRCH;
}
- /*
- * Only allow this on the current proc for now.
- * We can check for privileges and allow targeting another process in the future.
- */
- if (p != current_proc()) {
- proc_rele(p);
- return EPERM;
- }
-
proc_list_lock();
- if (is_freezable == FALSE) {
- /* Freeze preference set to FALSE. Set the P_MEMSTAT_FREEZE_DISABLED bit. */
- p->p_memstat_state |= P_MEMSTAT_FREEZE_DISABLED;
- printf("memorystatus_set_process_is_freezable: disabling freeze for pid %d [%s]\n",
- p->p_pid, (*p->p_name ? p->p_name : "unknown"));
- } else {
+ if (set_managed == TRUE) {
+ p->p_memstat_state |= P_MEMSTAT_MANAGED;
+ /*
+ * The P_MEMSTAT_MANAGED bit is set by assertiond for Apps.
+ * Also opt them in to being frozen (they might have started
+ * off with the P_MEMSTAT_FREEZE_DISABLED bit set.)
+ */
p->p_memstat_state &= ~P_MEMSTAT_FREEZE_DISABLED;
- printf("memorystatus_set_process_is_freezable: enabling freeze for pid %d [%s]\n",
- p->p_pid, (*p->p_name ? p->p_name : "unknown"));
+ } else {
+ p->p_memstat_state &= ~P_MEMSTAT_MANAGED;
}
proc_rele_locked(p);
proc_list_unlock();
os_reason_t jetsam_reason = OS_REASON_NULL;
#if !CONFIG_JETSAM
- #pragma unused(ret)
- #pragma unused(jetsam_reason)
+ #pragma unused(ret)
+ #pragma unused(jetsam_reason)
#endif
- /* We don't need entitlements if we're setting/ querying the freeze preference for a process. Skip the check below. */
- if (args->command == MEMORYSTATUS_CMD_SET_PROCESS_IS_FREEZABLE || args->command == MEMORYSTATUS_CMD_GET_PROCESS_IS_FREEZABLE) {
+ /* We don't need entitlements if we're setting / querying the freeze preference or frozen status for a process. */
+ if (args->command == MEMORYSTATUS_CMD_SET_PROCESS_IS_FREEZABLE ||
+ args->command == MEMORYSTATUS_CMD_GET_PROCESS_IS_FREEZABLE ||
+ args->command == MEMORYSTATUS_CMD_GET_PROCESS_IS_FROZEN) {
skip_auth_check = TRUE;
}
error = memorystatus_cmd_get_priority_list(args->pid, args->buffer, args->buffersize, ret);
break;
case MEMORYSTATUS_CMD_SET_PRIORITY_PROPERTIES:
- error = memorystatus_cmd_set_priority_properties(args->pid, args->buffer, args->buffersize, ret);
+ error = memorystatus_cmd_set_priority_properties(args->pid, args->flags, args->buffer, args->buffersize, ret);
break;
case MEMORYSTATUS_CMD_SET_MEMLIMIT_PROPERTIES:
error = memorystatus_cmd_set_memlimit_properties(args->pid, args->buffer, args->buffersize, ret);
case MEMORYSTATUS_CMD_GET_JETSAM_SNAPSHOT:
error = memorystatus_cmd_get_jetsam_snapshot((int32_t)args->flags, args->buffer, args->buffersize, ret);
break;
+#if DEVELOPMENT || DEBUG
+ case MEMORYSTATUS_CMD_SET_JETSAM_SNAPSHOT_OWNERSHIP:
+ error = memorystatus_cmd_set_jetsam_snapshot_ownership((int32_t) args->flags);
+ break;
+#endif
case MEMORYSTATUS_CMD_GET_PRESSURE_STATUS:
error = memorystatus_cmd_get_pressure_status(ret);
break;
error = memorystatus_kill_process_sync(args->pid, kMemorystatusKilled, jetsam_reason) ? 0 : EINVAL;
break;
case MEMORYSTATUS_CMD_TEST_JETSAM_SORT:
- error = memorystatus_cmd_test_jetsam_sort(args->pid, (int32_t)args->flags);
+ error = memorystatus_cmd_test_jetsam_sort(args->pid, (int32_t)args->flags, args->buffer, args->buffersize);
break;
#if CONFIG_JETSAM
case MEMORYSTATUS_CMD_SET_JETSAM_PANIC_BITS:
memorystatus_aggressive_jetsam_lenient = FALSE;
error = 0;
break;
+ case MEMORYSTATUS_CMD_GET_AGGRESSIVE_JETSAM_LENIENT_MODE:
+ *ret = (memorystatus_aggressive_jetsam_lenient ? 1 : 0);
+ error = 0;
+ break;
case MEMORYSTATUS_CMD_PRIVILEGED_LISTENER_ENABLE:
case MEMORYSTATUS_CMD_PRIVILEGED_LISTENER_DISABLE:
error = memorystatus_low_mem_privileged_listener(args->command);
error = memorystatus_get_process_is_managed(args->pid, ret);
break;
+#if CONFIG_FREEZE
case MEMORYSTATUS_CMD_SET_PROCESS_IS_FREEZABLE:
error = memorystatus_set_process_is_freezable(args->pid, args->flags ? TRUE : FALSE);
break;
case MEMORYSTATUS_CMD_GET_PROCESS_IS_FREEZABLE:
error = memorystatus_get_process_is_freezable(args->pid, ret);
break;
+ case MEMORYSTATUS_CMD_GET_PROCESS_IS_FROZEN:
+ error = memorystatus_get_process_is_frozen(args->pid, ret);
+ break;
-#if CONFIG_FREEZE
-#if DEVELOPMENT || DEBUG
case MEMORYSTATUS_CMD_FREEZER_CONTROL:
error = memorystatus_freezer_control(args->flags, args->buffer, args->buffersize, ret);
break;
-#endif /* DEVELOPMENT || DEBUG */
#endif /* CONFIG_FREEZE */
+#if CONFIG_JETSAM
+#if DEVELOPMENT || DEBUG
+ case MEMORYSTATUS_CMD_INCREASE_JETSAM_TASK_LIMIT:
+ error = memorystatus_cmd_increase_jetsam_task_limit(args->pid, args->flags);
+ break;
+#endif /* DEVELOPMENT || DEBUG */
+#endif /* CONFIG_JETSAM */
+
default:
break;
}
return error;
}
-
-static int
-filt_memorystatusattach(struct knote *kn, __unused struct kevent_internal_s *kev)
-{
- int error;
-
- kn->kn_flags |= EV_CLEAR;
- error = memorystatus_knote_register(kn);
- if (error) {
- kn->kn_flags = EV_ERROR;
- kn->kn_data = error;
- }
- return 0;
-}
-
-static void
-filt_memorystatusdetach(struct knote *kn)
-{
- memorystatus_knote_unregister(kn);
-}
-
-static int
-filt_memorystatus(struct knote *kn __unused, long hint)
-{
- if (hint) {
- switch (hint) {
- case kMemorystatusNoPressure:
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PRESSURE_NORMAL) {
- kn->kn_fflags = NOTE_MEMORYSTATUS_PRESSURE_NORMAL;
- }
- break;
- case kMemorystatusPressure:
- if (memorystatus_vm_pressure_level == kVMPressureWarning || memorystatus_vm_pressure_level == kVMPressureUrgent) {
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PRESSURE_WARN) {
- kn->kn_fflags = NOTE_MEMORYSTATUS_PRESSURE_WARN;
- }
- } else if (memorystatus_vm_pressure_level == kVMPressureCritical) {
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PRESSURE_CRITICAL) {
- kn->kn_fflags = NOTE_MEMORYSTATUS_PRESSURE_CRITICAL;
- }
- }
- break;
- case kMemorystatusLowSwap:
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_LOW_SWAP) {
- kn->kn_fflags = NOTE_MEMORYSTATUS_LOW_SWAP;
- }
- break;
-
- case kMemorystatusProcLimitWarn:
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN) {
- kn->kn_fflags = NOTE_MEMORYSTATUS_PROC_LIMIT_WARN;
- }
- break;
-
- case kMemorystatusProcLimitCritical:
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL) {
- kn->kn_fflags = NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL;
- }
- break;
-
- default:
- break;
- }
- }
-
-#if 0
- if (kn->kn_fflags != 0) {
- proc_t knote_proc = knote_get_kq(kn)->kq_p;
- pid_t knote_pid = knote_proc->p_pid;
-
- printf("filt_memorystatus: sending kn 0x%lx (event 0x%x) for pid (%d)\n",
- (unsigned long)kn, kn->kn_fflags, knote_pid);
- }
-#endif
-
- return kn->kn_fflags != 0;
-}
-
-static int
-filt_memorystatustouch(struct knote *kn, struct kevent_internal_s *kev)
-{
- int res;
- int prev_kn_sfflags = 0;
-
- memorystatus_klist_lock();
-
- /*
- * copy in new kevent settings
- * (saving the "desired" data and fflags).
- */
-
- prev_kn_sfflags = kn->kn_sfflags;
- kn->kn_sfflags = (kev->fflags & EVFILT_MEMORYSTATUS_ALL_MASK);
-
-#if !CONFIG_EMBEDDED
- /*
- * Only on desktop do we restrict notifications to
- * one per active/inactive state (soft limits only).
- */
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN) {
- /*
- * Is there previous state to preserve?
- */
- if (prev_kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN) {
- /*
- * This knote was previously interested in proc_limit_warn,
- * so yes, preserve previous state.
- */
- if (prev_kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_ACTIVE) {
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_ACTIVE;
- }
- if (prev_kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_INACTIVE) {
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_INACTIVE;
- }
- } else {
- /*
- * This knote was not previously interested in proc_limit_warn,
- * but it is now. Set both states.
- */
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_ACTIVE;
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_INACTIVE;
- }
- }
-
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL) {
- /*
- * Is there previous state to preserve?
- */
- if (prev_kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL) {
- /*
- * This knote was previously interested in proc_limit_critical,
- * so yes, preserve previous state.
- */
- if (prev_kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_ACTIVE) {
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_ACTIVE;
- }
- if (prev_kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_INACTIVE) {
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_INACTIVE;
- }
- } else {
- /*
- * This knote was not previously interested in proc_limit_critical,
- * but it is now. Set both states.
- */
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_ACTIVE;
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_INACTIVE;
- }
- }
-#endif /* !CONFIG_EMBEDDED */
-
- /*
- * reset the output flags based on a
- * combination of the old events and
- * the new desired event list.
- */
- //kn->kn_fflags &= kn->kn_sfflags;
-
- res = (kn->kn_fflags != 0);
-
- memorystatus_klist_unlock();
-
- return res;
-}
-
-static int
-filt_memorystatusprocess(struct knote *kn, struct filt_process_s *data, struct kevent_internal_s *kev)
-{
-#pragma unused(data)
- int res;
-
- memorystatus_klist_lock();
- res = (kn->kn_fflags != 0);
- if (res) {
- *kev = kn->kn_kevent;
- kn->kn_flags |= EV_CLEAR; /* automatic */
- kn->kn_fflags = 0;
- kn->kn_data = 0;
- }
- memorystatus_klist_unlock();
-
- return res;
-}
-
-static void
-memorystatus_klist_lock(void)
-{
- lck_mtx_lock(&memorystatus_klist_mutex);
-}
-
-static void
-memorystatus_klist_unlock(void)
-{
- lck_mtx_unlock(&memorystatus_klist_mutex);
-}
-
-void
-memorystatus_kevent_init(lck_grp_t *grp, lck_attr_t *attr)
-{
- lck_mtx_init(&memorystatus_klist_mutex, grp, attr);
- klist_init(&memorystatus_klist);
-}
-
-int
-memorystatus_knote_register(struct knote *kn)
-{
- int error = 0;
-
- memorystatus_klist_lock();
-
- /*
- * Support only userspace visible flags.
- */
- if ((kn->kn_sfflags & EVFILT_MEMORYSTATUS_ALL_MASK) == (unsigned int) kn->kn_sfflags) {
-#if !CONFIG_EMBEDDED
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN) {
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_ACTIVE;
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_INACTIVE;
- }
-
- if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL) {
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_ACTIVE;
- kn->kn_sfflags |= NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_INACTIVE;
- }
-#endif /* !CONFIG_EMBEDDED */
-
- KNOTE_ATTACH(&memorystatus_klist, kn);
- } else {
- error = ENOTSUP;
- }
-
- memorystatus_klist_unlock();
-
- return error;
-}
-
-void
-memorystatus_knote_unregister(struct knote *kn __unused)
-{
- memorystatus_klist_lock();
- KNOTE_DETACH(&memorystatus_klist, kn);
- memorystatus_klist_unlock();
-}
-
-
-#if 0
-#if CONFIG_JETSAM && VM_PRESSURE_EVENTS
-static boolean_t
-memorystatus_issue_pressure_kevent(boolean_t pressured)
-{
- memorystatus_klist_lock();
- KNOTE(&memorystatus_klist, pressured ? kMemorystatusPressure : kMemorystatusNoPressure);
- memorystatus_klist_unlock();
- return TRUE;
-}
-#endif /* CONFIG_JETSAM && VM_PRESSURE_EVENTS */
-#endif /* 0 */
-
/* Coalition support */
/* sorting info for a particular priority bucket */
p = memorystatus_get_first_proc_locked(&b, FALSE);
while (p) {
- if (coalition_is_leader(p->task, COALITION_TYPE_JETSAM, &coal)) {
+ coal = task_get_coalition(p->task, COALITION_TYPE_JETSAM);
+ if (coalition_is_leader(p->task, coal)) {
if (nleaders < MAX_COAL_LEADERS) {
int coal_ntasks = 0;
uint64_t coal_page_count = coalition_get_page_count(coal, &coal_ntasks);
TAILQ_REMOVE(¤t_bucket->list, p, p_memstat_list);
current_bucket->count--;
-
+ if (p->p_memstat_relaunch_flags & (P_MEMSTAT_RELAUNCH_HIGH)) {
+ current_bucket->relaunch_high_count--;
+ }
TAILQ_INSERT_TAIL(&new_bucket->list, p, p_memstat_list);
new_bucket->count++;
-
+ if (p->p_memstat_relaunch_flags & (P_MEMSTAT_RELAUNCH_HIGH)) {
+ new_bucket->relaunch_high_count++;
+ }
/*
* Record idle start or idle delta.
*/
return -1;
#endif /* !CONFIG_JETSAM */
}
+
+uint64_t
+memorystatus_available_memory_internal(struct proc *p)
+{
+#ifdef XNU_TARGET_OS_OSX
+ if (p->p_memstat_memlimit <= 0) {
+ return 0;
+ }
+#endif /* XNU_TARGET_OS_OSX */
+ const uint64_t footprint_in_bytes = get_task_phys_footprint(p->task);
+ int32_t memlimit_mb;
+ int64_t memlimit_bytes;
+ int64_t rc;
+
+ if (isApp(p) == FALSE) {
+ return 0;
+ }
+
+ if (p->p_memstat_memlimit > 0) {
+ memlimit_mb = p->p_memstat_memlimit;
+ } else if (task_convert_phys_footprint_limit(-1, &memlimit_mb) != KERN_SUCCESS) {
+ return 0;
+ }
+
+ if (memlimit_mb <= 0) {
+ memlimit_bytes = INT_MAX & ~((1 << 20) - 1);
+ } else {
+ memlimit_bytes = ((int64_t) memlimit_mb) << 20;
+ }
+
+ rc = memlimit_bytes - footprint_in_bytes;
+
+ return (rc >= 0) ? rc : 0;
+}
+
+int
+memorystatus_available_memory(struct proc *p, __unused struct memorystatus_available_memory_args *args, uint64_t *ret)
+{
+ *ret = memorystatus_available_memory_internal(p);
+
+ return 0;
+}
+
+#if CONFIG_JETSAM
+#if DEVELOPMENT || DEBUG
+static int
+memorystatus_cmd_increase_jetsam_task_limit(pid_t pid, uint32_t byte_increase)
+{
+ memorystatus_memlimit_properties_t mmp_entry;
+
+ /* Validate inputs */
+ if ((pid == 0) || (byte_increase == 0)) {
+ return EINVAL;
+ }
+
+ proc_t p = proc_find(pid);
+
+ if (!p) {
+ return ESRCH;
+ }
+
+ const uint32_t current_memlimit_increase = roundToNearestMB(p->p_memlimit_increase);
+ /* round to page */
+ const int32_t page_aligned_increase = (int32_t) MIN(round_page(p->p_memlimit_increase + byte_increase), INT32_MAX);
+
+ proc_list_lock();
+
+ memorystatus_get_memlimit_properties_internal(p, &mmp_entry);
+
+ if (mmp_entry.memlimit_active > 0) {
+ mmp_entry.memlimit_active -= current_memlimit_increase;
+ mmp_entry.memlimit_active += roundToNearestMB(page_aligned_increase);
+ }
+
+ if (mmp_entry.memlimit_inactive > 0) {
+ mmp_entry.memlimit_inactive -= current_memlimit_increase;
+ mmp_entry.memlimit_inactive += roundToNearestMB(page_aligned_increase);
+ }
+
+ /*
+ * Store the updated delta limit in the proc.
+ */
+ p->p_memlimit_increase = page_aligned_increase;
+
+ int error = memorystatus_set_memlimit_properties_internal(p, &mmp_entry);
+
+ proc_list_unlock();
+ proc_rele(p);
+
+ return error;
+}
+#endif /* DEVELOPMENT */
+#endif /* CONFIG_JETSAM */
projects / apple / xnu.git / blobdiff