#include <kern/kalloc.h>
#include <kern/assert.h>
#include <kern/debug.h>
-#include <kern/lock.h>
+#include <kern/locks.h>
#include <kern/task.h>
#include <kern/thread.h>
#include <kern/host.h>
+#include <kern/policy_internal.h>
+
+#include <IOKit/IOBSD.h>
+
#include <libkern/libkern.h>
+#include <mach/coalition.h>
#include <mach/mach_time.h>
#include <mach/task.h>
#include <mach/host_priv.h>
#include <mach/mach_host.h>
#include <pexpert/pexpert.h>
+#include <sys/coalition.h>
#include <sys/kern_event.h>
#include <sys/proc.h>
#include <sys/proc_info.h>
+#include <sys/reason.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/sysctl.h>
#include <sys/kern_memorystatus.h>
+#include <mach/machine/sdt.h>
+
+/* For logging clarity */
+static const char *jetsam_kill_cause_name[] = {
+ "" ,
+ "jettisoned" , /* kMemorystatusKilled */
+ "highwater" , /* kMemorystatusKilledHiwat */
+ "vnode-limit" , /* kMemorystatusKilledVnodes */
+ "vm-pageshortage" , /* kMemorystatusKilledVMPageShortage */
+ "vm-thrashing" , /* kMemorystatusKilledVMThrashing */
+ "fc-thrashing" , /* kMemorystatusKilledFCThrashing */
+ "per-process-limit" , /* kMemorystatusKilledPerProcessLimit */
+ "diagnostic" , /* kMemorystatusKilledDiagnostic */
+ "idle-exit" , /* kMemorystatusKilledIdleExit */
+};
+
+#if CONFIG_JETSAM
+/* Does cause indicate vm or fc thrashing? */
+static boolean_t
+is_thrashing(unsigned cause)
+{
+ switch (cause) {
+ case kMemorystatusKilledVMThrashing:
+ case kMemorystatusKilledFCThrashing:
+ return TRUE;
+ default:
+ return FALSE;
+ }
+}
+
+/* Callback into vm_compressor.c to signal that thrashing has been mitigated. */
+extern void vm_thrashing_jetsam_done(void);
+#endif /* CONFIG_JETSAM */
+
/* These are very verbose printfs(), enable with
* MEMORYSTATUS_DEBUG_LOG
*/
#define MEMORYSTATUS_DEBUG(cond, format, ...)
#endif
+/*
+ * Active / Inactive limit support
+ * proc list must be locked
+ *
+ * The SET_*** macros are used to initialize a limit
+ * for the first time.
+ *
+ * The CACHE_*** macros are use to cache the limit that will
+ * soon be in effect down in the ledgers.
+ */
+
+#define SET_ACTIVE_LIMITS_LOCKED(p, limit, is_fatal) \
+MACRO_BEGIN \
+(p)->p_memstat_memlimit_active = (limit); \
+ (p)->p_memstat_state &= ~P_MEMSTAT_MEMLIMIT_ACTIVE_EXC_TRIGGERED; \
+ if (is_fatal) { \
+ (p)->p_memstat_state |= P_MEMSTAT_MEMLIMIT_ACTIVE_FATAL; \
+ } else { \
+ (p)->p_memstat_state &= ~P_MEMSTAT_MEMLIMIT_ACTIVE_FATAL; \
+ } \
+MACRO_END
+
+#define SET_INACTIVE_LIMITS_LOCKED(p, limit, is_fatal) \
+MACRO_BEGIN \
+(p)->p_memstat_memlimit_inactive = (limit); \
+ (p)->p_memstat_state &= ~P_MEMSTAT_MEMLIMIT_INACTIVE_EXC_TRIGGERED; \
+ if (is_fatal) { \
+ (p)->p_memstat_state |= P_MEMSTAT_MEMLIMIT_INACTIVE_FATAL; \
+ } else { \
+ (p)->p_memstat_state &= ~P_MEMSTAT_MEMLIMIT_INACTIVE_FATAL; \
+ } \
+MACRO_END
+
+#define CACHE_ACTIVE_LIMITS_LOCKED(p, trigger_exception) \
+MACRO_BEGIN \
+(p)->p_memstat_memlimit = (p)->p_memstat_memlimit_active; \
+ if ((p)->p_memstat_state & P_MEMSTAT_MEMLIMIT_ACTIVE_FATAL) { \
+ (p)->p_memstat_state |= P_MEMSTAT_FATAL_MEMLIMIT; \
+ } else { \
+ (p)->p_memstat_state &= ~P_MEMSTAT_FATAL_MEMLIMIT; \
+ } \
+ if ((p)->p_memstat_state & P_MEMSTAT_MEMLIMIT_ACTIVE_EXC_TRIGGERED) { \
+ trigger_exception = FALSE; \
+ } else { \
+ trigger_exception = TRUE; \
+ } \
+MACRO_END
+
+#define CACHE_INACTIVE_LIMITS_LOCKED(p, trigger_exception) \
+MACRO_BEGIN \
+(p)->p_memstat_memlimit = (p)->p_memstat_memlimit_inactive; \
+ if ((p)->p_memstat_state & P_MEMSTAT_MEMLIMIT_INACTIVE_FATAL) { \
+ (p)->p_memstat_state |= P_MEMSTAT_FATAL_MEMLIMIT; \
+ } else { \
+ (p)->p_memstat_state &= ~P_MEMSTAT_FATAL_MEMLIMIT; \
+ } \
+ if ((p)->p_memstat_state & P_MEMSTAT_MEMLIMIT_INACTIVE_EXC_TRIGGERED) { \
+ trigger_exception = FALSE; \
+ } else { \
+ trigger_exception = TRUE; \
+ } \
+MACRO_END
+
+
/* General tunables */
unsigned long delta_percentage = 5;
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;
/* General memorystatus stuff */
static void memorystatus_klist_lock(void);
static void memorystatus_klist_unlock(void);
-static uint64_t memorystatus_idle_delay_time = 0;
+static uint64_t memorystatus_sysprocs_idle_delay_time = 0;
+static uint64_t memorystatus_apps_idle_delay_time = 0;
/*
* Memorystatus kevents
static int filt_memorystatusattach(struct knote *kn);
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);
struct filterops memorystatus_filtops = {
.f_attach = filt_memorystatusattach,
.f_detach = filt_memorystatusdetach,
.f_event = filt_memorystatus,
+ .f_touch = filt_memorystatustouch,
+ .f_process = filt_memorystatusprocess,
};
enum {
- kMemorystatusNoPressure = 1,
- kMemorystatusPressure = 2
+ kMemorystatusNoPressure = 0x1,
+ kMemorystatusPressure = 0x2,
+ kMemorystatusLowSwap = 0x4,
+ kMemorystatusProcLimitWarn = 0x8,
+ kMemorystatusProcLimitCritical = 0x10
};
/* Idle guard handling */
-static int32_t memorystatus_scheduled_idle_demotions = 0;
+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_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);
+static void memorystatus_update_priority_locked(proc_t p, int priority, boolean_t head_insert, boolean_t skip_demotion_check);
+
+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_wakeup = 0;
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)))
+#define isApp(p) (! (p->p_memstat_dirty & P_DIRTY_TRACK))
+#define isSysProc(p) ((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;
+
+extern int corpse_for_fatal_memkill;
+extern unsigned long total_corpses_count;
+extern void task_purge_all_corpses(void);
+
+#if 0
+
+/* Keeping around for future use if we need a utility that can do this OR an app that needs a dynamic adjustment. */
+
+static int
+sysctl_set_jetsam_aging_policy SYSCTL_HANDLER_ARGS
+{
+#pragma unused(oidp, arg1, arg2)
+
+ int error = 0, val = 0;
+ memstat_bucket_t *old_bucket = 0;
+ int old_system_procs_aging_band = 0, new_system_procs_aging_band = 0;
+ int old_applications_aging_band = 0, new_applications_aging_band = 0;
+ proc_t p = NULL, next_proc = NULL;
+
+
+ error = sysctl_io_number(req, jetsam_aging_policy, sizeof(int), &val, NULL);
+ if (error || !req->newptr) {
+ return (error);
+ }
+
+ if ((val < 0) || (val > kJetsamAgingPolicyMax)) {
+ printf("jetsam: ordering policy sysctl has invalid value - %d\n", val);
+ return EINVAL;
+ }
+
+ /*
+ * We need to synchronize with any potential adding/removal from aging bands
+ * that might be in progress currently. We use the proc_list_lock() just for
+ * consistency with all the routines dealing with 'aging' processes. We need
+ * a lighterweight lock.
+ */
+ proc_list_lock();
+
+ old_system_procs_aging_band = system_procs_aging_band;
+ old_applications_aging_band = applications_aging_band;
+
+ switch (val) {
+
+ case kJetsamAgingPolicyNone:
+ new_system_procs_aging_band = JETSAM_PRIORITY_IDLE;
+ new_applications_aging_band = JETSAM_PRIORITY_IDLE;
+ break;
+
+ 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.
+ */
+ new_system_procs_aging_band = JETSAM_PRIORITY_AGING_BAND1;
+ new_applications_aging_band = JETSAM_PRIORITY_IDLE;
+ break;
+
+ case kJetsamAgingPolicySysProcsReclaimedFirst:
+ new_system_procs_aging_band = JETSAM_PRIORITY_AGING_BAND1;
+ new_applications_aging_band = JETSAM_PRIORITY_AGING_BAND2;
+ break;
+
+ case kJetsamAgingPolicyAppsReclaimedFirst:
+ new_system_procs_aging_band = JETSAM_PRIORITY_AGING_BAND2;
+ new_applications_aging_band = JETSAM_PRIORITY_AGING_BAND1;
+ break;
+
+ default:
+ break;
+ }
+
+ if (old_system_procs_aging_band && (old_system_procs_aging_band != new_system_procs_aging_band)) {
+
+ old_bucket = &memstat_bucket[old_system_procs_aging_band];
+ p = TAILQ_FIRST(&old_bucket->list);
+
+ while (p) {
+
+ next_proc = TAILQ_NEXT(p, p_memstat_list);
+
+ if (isSysProc(p)) {
+ if (new_system_procs_aging_band == JETSAM_PRIORITY_IDLE) {
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ }
+
+ memorystatus_update_priority_locked(p, new_system_procs_aging_band, false, true);
+ }
+
+ p = next_proc;
+ continue;
+ }
+ }
+
+ if (old_applications_aging_band && (old_applications_aging_band != new_applications_aging_band)) {
+
+ old_bucket = &memstat_bucket[old_applications_aging_band];
+ p = TAILQ_FIRST(&old_bucket->list);
+
+ while (p) {
+
+ next_proc = TAILQ_NEXT(p, p_memstat_list);
+
+ if (isApp(p)) {
+ if (new_applications_aging_band == JETSAM_PRIORITY_IDLE) {
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ }
+
+ memorystatus_update_priority_locked(p, new_applications_aging_band, false, true);
+ }
+
+ p = next_proc;
+ continue;
+ }
+ }
+
+ jetsam_aging_policy = val;
+ system_procs_aging_band = new_system_procs_aging_band;
+ applications_aging_band = new_applications_aging_band;
+
+ proc_list_unlock();
+
+ return (0);
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, set_jetsam_aging_policy, CTLTYPE_INT|CTLFLAG_RW,
+ 0, 0, sysctl_set_jetsam_aging_policy, "I", "Jetsam Aging Policy");
+#endif /*0*/
+
+static int
+sysctl_jetsam_set_sysprocs_idle_delay_time SYSCTL_HANDLER_ARGS
+{
+#pragma unused(oidp, arg1, arg2)
+
+ int error = 0, val = 0, old_time_in_secs = 0;
+ 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;
+
+ error = sysctl_io_number(req, old_time_in_secs, sizeof(int), &val, NULL);
+ if (error || !req->newptr) {
+ return (error);
+ }
+
+ if ((val < 0) || (val > INT32_MAX)) {
+ printf("jetsam: new idle delay interval has invalid value.\n");
+ return EINVAL;
+ }
+
+ nanoseconds_to_absolutetime((uint64_t)val * NSEC_PER_SEC, &memorystatus_sysprocs_idle_delay_time);
+
+ return(0);
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, memorystatus_sysprocs_idle_delay_time, CTLTYPE_INT|CTLFLAG_RW,
+ 0, 0, sysctl_jetsam_set_sysprocs_idle_delay_time, "I", "Aging window for system processes");
+
+
+static int
+sysctl_jetsam_set_apps_idle_delay_time SYSCTL_HANDLER_ARGS
+{
+#pragma unused(oidp, arg1, arg2)
+
+ int error = 0, val = 0, old_time_in_secs = 0;
+ 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;
+
+ error = sysctl_io_number(req, old_time_in_secs, sizeof(int), &val, NULL);
+ if (error || !req->newptr) {
+ return (error);
+ }
+
+ if ((val < 0) || (val > INT32_MAX)) {
+ printf("jetsam: new idle delay interval has invalid value.\n");
+ return EINVAL;
+ }
+
+ nanoseconds_to_absolutetime((uint64_t)val * NSEC_PER_SEC, &memorystatus_apps_idle_delay_time);
+
+ return(0);
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, memorystatus_apps_idle_delay_time, CTLTYPE_INT|CTLFLAG_RW,
+ 0, 0, sysctl_jetsam_set_apps_idle_delay_time, "I", "Aging window for applications");
+
+SYSCTL_INT(_kern, OID_AUTO, jetsam_aging_policy, CTLTYPE_INT|CTLFLAG_RD, &jetsam_aging_policy, 0, "");
+
static unsigned int memorystatus_dirty_count = 0;
-#if !CONFIG_JETSAM
-static boolean_t kill_idle_exit = FALSE;
-#endif
+SYSCTL_INT(_kern, OID_AUTO, max_task_pmem, CTLFLAG_RD|CTLFLAG_LOCKED|CTLFLAG_MASKED, &max_task_footprint_mb, 0, "");
int
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);
+
+
/* Jetsam */
#if CONFIG_JETSAM
-/* Kill processes exceeding their limit either under memory pressure (1), or as soon as possible (0) */
-#define LEGACY_HIWATER 1
+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);
-static int memorystatus_highwater_enabled = 1;
+static int memorystatus_cmd_set_memlimit_properties(pid_t pid, user_addr_t buffer, size_t buffer_size, __unused int32_t *retval);
-extern unsigned int vm_page_free_count;
-extern unsigned int vm_page_active_count;
-extern unsigned int vm_page_inactive_count;
-extern unsigned int vm_page_throttled_count;
-extern unsigned int vm_page_purgeable_count;
-extern unsigned int vm_page_wire_count;
+static int memorystatus_set_memlimit_properties(pid_t pid, memorystatus_memlimit_properties_t *entry);
+
+static int memorystatus_cmd_get_memlimit_properties(pid_t pid, user_addr_t buffer, size_t buffer_size, __unused int32_t *retval);
+
+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);
+
+int proc_get_memstat_priority(proc_t, boolean_t);
+
+static boolean_t memorystatus_idle_snapshot = 0;
unsigned int memorystatus_delta = 0;
-static unsigned int memorystatus_available_pages = (unsigned int)-1;
-static unsigned int memorystatus_available_pages_pressure = 0;
-static unsigned int memorystatus_available_pages_critical = 0;
static unsigned int memorystatus_available_pages_critical_base = 0;
-static unsigned int memorystatus_last_foreground_pressure_pages = (unsigned int)-1;
-#if !LATENCY_JETSAM
+//static unsigned int memorystatus_last_foreground_pressure_pages = (unsigned int)-1;
static unsigned int memorystatus_available_pages_critical_idle_offset = 0;
-#endif
+
+/* Jetsam Loop Detection */
+static boolean_t memorystatus_jld_enabled = TRUE; /* Enables jetsam loop detection on all devices */
+static uint32_t memorystatus_jld_eval_period_msecs = 0; /* Init pass sets this based on device memory size */
+static int memorystatus_jld_eval_aggressive_count = 3; /* Raise the priority max after 'n' aggressive loops */
+static int memorystatus_jld_eval_aggressive_priority_band_max = 15; /* Kill aggressively up through this band */
+
+/*
+ * A FG app can request that the aggressive jetsam mechanism display some leniency in the FG band. This 'lenient' mode is described as:
+ * --- if aggressive jetsam kills an app in the FG band and gets back >=AGGRESSIVE_JETSAM_LENIENT_MODE_THRESHOLD memory, it will stop the aggressive march further into and up the jetsam bands.
+ *
+ * RESTRICTIONS:
+ * - Such a request is respected/acknowledged only once while that 'requesting' app is in the FG band i.e. if aggressive jetsam was
+ * needed and the 'lenient' mode was deployed then that's it for this special mode while the app is in the FG band.
+ *
+ * - If the app is still in the FG band and aggressive jetsam is needed again, there will be no stop-and-check the next time around.
+ *
+ * - Also, the transition of the 'requesting' app away from the FG band will void this special behavior.
+ */
+
+#define AGGRESSIVE_JETSAM_LENIENT_MODE_THRESHOLD 25
+boolean_t memorystatus_aggressive_jetsam_lenient_allowed = FALSE;
+boolean_t memorystatus_aggressive_jetsam_lenient = FALSE;
#if DEVELOPMENT || DEBUG
-static unsigned int memorystatus_jetsam_panic_debug = 0;
+/*
+ * Jetsam Loop Detection tunables.
+ */
-static unsigned int memorystatus_jetsam_policy = kPolicyDefault;
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_jld_eval_period_msecs, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_jld_eval_period_msecs, 0, "");
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_jld_eval_aggressive_count, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_jld_eval_aggressive_count, 0, "");
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_jld_eval_aggressive_priority_band_max, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_jld_eval_aggressive_priority_band_max, 0, "");
+#endif /* DEVELOPMENT || DEBUG */
+
+#if DEVELOPMENT || DEBUG
+static unsigned int memorystatus_jetsam_panic_debug = 0;
static unsigned int memorystatus_jetsam_policy_offset_pages_diagnostic = 0;
#endif
-static boolean_t kill_under_pressure = FALSE;
+static unsigned int memorystatus_jetsam_policy = kPolicyDefault;
+static unsigned int memorystatus_thread_wasted_wakeup = 0;
+
+static uint32_t kill_under_pressure_cause = 0;
+/*
+ * default jetsam snapshot support
+ */
static memorystatus_jetsam_snapshot_t *memorystatus_jetsam_snapshot;
#define memorystatus_jetsam_snapshot_list memorystatus_jetsam_snapshot->entries
-
static unsigned int memorystatus_jetsam_snapshot_count = 0;
static unsigned int memorystatus_jetsam_snapshot_max = 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 memorystatus_jetsam_snapshot_t memorystatus_at_boot_snapshot;
+
+static void memorystatus_init_jetsam_snapshot_locked(memorystatus_jetsam_snapshot_t *od_snapshot, uint32_t ods_list_count);
+static boolean_t memorystatus_init_jetsam_snapshot_entry_locked(proc_t p, memorystatus_jetsam_snapshot_entry_t *entry, uint64_t gencount);
+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);
-static int memorystatus_send_note(int event_code, void *data, size_t data_length);
+static void memorystatus_get_task_page_counts(task_t task, uint32_t *footprint, uint32_t *max_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);
+
+static void memorystatus_get_task_memory_region_count(task_t task, uint64_t *count);
+
static uint32_t memorystatus_build_state(proc_t p);
static void memorystatus_update_levels_locked(boolean_t critical_only);
-static boolean_t memorystatus_issue_pressure_kevent(boolean_t pressured);
+//static boolean_t memorystatus_issue_pressure_kevent(boolean_t pressured);
-static boolean_t memorystatus_kill_specific_process(pid_t victim_pid, uint32_t cause);
-static boolean_t memorystatus_kill_top_process(boolean_t any, uint32_t cause, int32_t *priority, uint32_t *errors);
-#if LEGACY_HIWATER
+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(boolean_t any, uint32_t cause, os_reason_t jetsam_reason, 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, int aggr_count, uint32_t *errors);
static boolean_t memorystatus_kill_hiwat_proc(uint32_t *errors);
-#endif
static boolean_t memorystatus_kill_process_async(pid_t victim_pid, uint32_t cause);
-static boolean_t memorystatus_kill_process_sync(pid_t victim_pid, uint32_t cause);
+
+/* Priority Band Sorting Routines */
+static int memorystatus_sort_bucket(unsigned int bucket_index, int sort_order);
+static int memorystatus_sort_by_largest_coalition_locked(unsigned int bucket_index, int coal_sort_order);
+static void memorystatus_sort_by_largest_process_locked(unsigned int bucket_index);
+static int memorystatus_move_list_locked(unsigned int bucket_index, pid_t *pid_list, int list_sz);
+
+/* qsort routines */
+typedef int (*cmpfunc_t)(const void *a, const void *b);
+extern void qsort(void *a, size_t n, size_t es, cmpfunc_t cmp);
+static int memstat_asc_cmp(const void *a, const void *b);
#endif /* CONFIG_JETSAM */
/* VM pressure */
-#if VM_PRESSURE_EVENTS
+extern unsigned int vm_page_free_count;
+extern unsigned int vm_page_active_count;
+extern unsigned int vm_page_inactive_count;
+extern unsigned int vm_page_throttled_count;
+extern unsigned int vm_page_purgeable_count;
+extern unsigned int vm_page_wire_count;
+#if CONFIG_SECLUDED_MEMORY
+extern unsigned int vm_page_secluded_count;
+#endif /* CONFIG_SECLUDED_MEMORY */
-#include "vm_pressure.h"
+#if VM_PRESSURE_EVENTS
-extern boolean_t memorystatus_warn_process(pid_t pid);
+boolean_t memorystatus_warn_process(pid_t pid, boolean_t exceeded);
vm_pressure_level_t memorystatus_vm_pressure_level = kVMPressureNormal;
+#if CONFIG_MEMORYSTATUS
+unsigned int memorystatus_available_pages = (unsigned int)-1;
+unsigned int memorystatus_available_pages_pressure = 0;
+unsigned int memorystatus_available_pages_critical = 0;
+unsigned int memorystatus_frozen_count = 0;
+unsigned int memorystatus_suspended_count = 0;
+unsigned int memorystatus_policy_more_free_offset_pages = 0;
+
+/*
+ * 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);
+#endif /* CONFIG_MEMORYSTATUS */
+
#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;
+
+#endif
+
+
/* Freeze */
#if CONFIG_FREEZE
boolean_t memorystatus_freeze_enabled = FALSE;
int memorystatus_freeze_wakeup = 0;
+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);
/* Thresholds */
static unsigned int memorystatus_freeze_threshold = 0;
-static unsigned int memorystatus_freeze_pages_min = FREEZE_PAGES_MIN;
-static unsigned int memorystatus_freeze_pages_max = FREEZE_PAGES_MAX;
-
-static unsigned int memorystatus_frozen_count = 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;
+
/* Stats */
static uint64_t memorystatus_freeze_count = 0;
static uint64_t memorystatus_freeze_pageouts = 0;
static uint64_t memorystatus_freeze_throttle_count = 0;
-static unsigned int memorystatus_suspended_count = 0;
-static unsigned int memorystatus_suspended_footprint_total = 0;
+static unsigned int memorystatus_suspended_footprint_total = 0; /* pages */
+
+extern uint64_t vm_swap_get_free_space(void);
+
+static boolean_t memorystatus_freeze_update_throttle();
#endif /* CONFIG_FREEZE */
/* Debug */
+extern struct knote *vm_find_knote_from_pid(pid_t, struct klist *);
+
#if DEVELOPMENT || DEBUG
-#if CONFIG_JETSAM
+static unsigned int memorystatus_debug_dump_this_bucket = 0;
+
+static void
+memorystatus_debug_dump_bucket_locked (unsigned int bucket_index)
+{
+ proc_t p = NULL;
+ uint64_t bytes = 0;
+ int ledger_limit = 0;
+ unsigned int b = bucket_index;
+ boolean_t traverse_all_buckets = FALSE;
+
+ if (bucket_index >= MEMSTAT_BUCKET_COUNT) {
+ traverse_all_buckets = TRUE;
+ b = 0;
+ } else {
+ traverse_all_buckets = FALSE;
+ b = bucket_index;
+ }
+
+ /*
+ * footprint reported in [pages / MB ]
+ * limits reported as:
+ * L-limit proc's Ledger limit
+ * C-limit proc's Cached limit, should match Ledger
+ * A-limit proc's Active limit
+ * IA-limit proc's Inactive limit
+ * F==Fatal, NF==NonFatal
+ */
+
+ 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");
+ 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",
+ 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,
+ ledger_limit,
+ p->p_memstat_memlimit,
+ (p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT ? "F " : "NF"),
+ p->p_memstat_memlimit_active,
+ (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_ACTIVE_FATAL ? "F " : "NF"),
+ p->p_memstat_memlimit_inactive,
+ (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_INACTIVE_FATAL ? "F " : "NF"),
+ (*p->p_name ? p->p_name : "unknown"));
+ p = memorystatus_get_next_proc_locked(&b, p, traverse_all_buckets);
+ }
+ printf("memorystatus_debug_dump ***END***\n");
+}
+
+static int
+sysctl_memorystatus_debug_dump_bucket SYSCTL_HANDLER_ARGS
+{
+#pragma unused(oidp, arg2)
+ int bucket_index = 0;
+ int error;
+ error = SYSCTL_OUT(req, arg1, sizeof(int));
+ if (error || !req->newptr) {
+ return (error);
+ }
+ error = SYSCTL_IN(req, &bucket_index, sizeof(int));
+ if (error || !req->newptr) {
+ return (error);
+ }
+ if (bucket_index >= MEMSTAT_BUCKET_COUNT) {
+ /*
+ * All jetsam buckets will be dumped.
+ */
+ } else {
+ /*
+ * Only a single bucket will be dumped.
+ */
+ }
+
+ proc_list_lock();
+ memorystatus_debug_dump_bucket_locked(bucket_index);
+ proc_list_unlock();
+ memorystatus_debug_dump_this_bucket = bucket_index;
+ return (error);
+}
+
+/*
+ * Debug aid to look at jetsam buckets and proc jetsam fields.
+ * Use this sysctl to act on a particular jetsam bucket.
+ * Writing the sysctl triggers the dump.
+ * Usage: sysctl kern.memorystatus_debug_dump_this_bucket=<bucket_index>
+ */
+
+SYSCTL_PROC(_kern, OID_AUTO, memorystatus_debug_dump_this_bucket, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_debug_dump_this_bucket, 0, sysctl_memorystatus_debug_dump_bucket, "I", "");
+
/* Debug aid to aid determination of limit */
proc_t p;
unsigned int b = 0;
int error, enable = 0;
- int32_t memlimit;
error = SYSCTL_OUT(req, arg1, sizeof(int));
if (error || !req->newptr) {
p = memorystatus_get_first_proc_locked(&b, TRUE);
while (p) {
+ boolean_t trigger_exception;
+
if (enable) {
- if ((p->p_memstat_state & P_MEMSTAT_MEMLIMIT_BACKGROUND) && (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND)) {
- memlimit = -1;
+ /*
+ * No need to consider P_MEMSTAT_MEMLIMIT_BACKGROUND anymore.
+ * Background limits are described via the inactive limit slots.
+ */
+
+ if (proc_jetsam_state_is_active_locked(p) == TRUE) {
+ CACHE_ACTIVE_LIMITS_LOCKED(p, trigger_exception);
} else {
- memlimit = p->p_memstat_memlimit;
+ CACHE_INACTIVE_LIMITS_LOCKED(p, trigger_exception);
}
+
} else {
- memlimit = -1;
+ /*
+ * Disabling limits does not touch the stored variants.
+ * Set the cached limit fields to system_wide defaults.
+ */
+ p->p_memstat_memlimit = -1;
+ p->p_memstat_state |= P_MEMSTAT_FATAL_MEMLIMIT;
+ trigger_exception = TRUE;
}
- task_set_phys_footprint_limit_internal(p->task, (memlimit > 0) ? memlimit : -1, NULL, TRUE);
-
+
+ /*
+ * Enforce the cached limit by writing to the ledger.
+ */
+ task_set_phys_footprint_limit_internal(p->task, (p->p_memstat_memlimit > 0) ? p->p_memstat_memlimit: -1, NULL, trigger_exception);
+
p = memorystatus_get_next_proc_locked(&b, p, TRUE);
}
proc_list_unlock();
return 0;
+
}
SYSCTL_PROC(_kern, OID_AUTO, memorystatus_highwater_enabled, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_highwater_enabled, 0, sysctl_memorystatus_highwater_enable, "I", "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages, CTLFLAG_RD|CTLFLAG_LOCKED, &memorystatus_available_pages, 0, "");
-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, "");
-#if !LATENCY_JETSAM
+#if VM_PRESSURE_EVENTS
+
+/*
+ * This routine is used for targeted notifications
+ * regardless of system memory pressure.
+ * "memnote" is the current user.
+ */
+
+static int
+sysctl_memorystatus_vm_pressure_send SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2)
+
+ 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;
+
+ error = sysctl_handle_quad(oidp, &value, 0, req);
+ if (error || !req->newptr)
+ return (error);
+
+ /*
+ * Find the pid in the low 32 bits of value passed in.
+ */
+ pid = (int)(value & 0xFFFFFFFF);
+
+ /*
+ * Find notification in the high 32 bits of the value passed in.
+ */
+ fflags = (int)((value >> 32) & 0xFFFFFFFF);
+
+ /*
+ * 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);
+ }
+
+ /*
+ * 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))) {
+
+ printf("memorystatus_vm_pressure_send: notification [0x%x] not supported \n", fflags);
+ error = 1;
+ return (error);
+ }
+
+ /*
+ * Forcibly send pid a memorystatus notification.
+ */
+
+ memorystatus_klist_lock();
+
+ 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 (knote_pid == pid) {
+ /*
+ * Forcibly send this pid a memorystatus notification.
+ */
+ kn->kn_fflags = fflags;
+ found_knote = TRUE;
+ }
+ }
+
+ 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();
+
+ 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 */
+
+#if CONFIG_JETSAM
+
+SYSCTL_INT(_kern, OID_AUTO, memorystatus_idle_snapshot, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_idle_snapshot, 0, "");
+
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages, CTLFLAG_RD|CTLFLAG_LOCKED, &memorystatus_available_pages, 0, "");
+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, "");
-#endif
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_policy_more_free_offset_pages, CTLFLAG_RW, &memorystatus_policy_more_free_offset_pages, 0, "");
/* Diagnostic code */
SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_pressure, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_available_pages_pressure, 0, "");
-static int
-sysctl_memorystatus_vm_pressure_level SYSCTL_HANDLER_ARGS
-{
-#pragma unused(arg1, arg2, oidp)
- int error = 0;
-
- error = priv_check_cred(kauth_cred_get(), PRIV_VM_PRESSURE, 0);
- if (error)
- return (error);
-
- return SYSCTL_OUT(req, &memorystatus_vm_pressure_level, sizeof(memorystatus_vm_pressure_level));
-}
-
-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", "");
-
-static int
-sysctl_memorystatus_vm_pressure_send SYSCTL_HANDLER_ARGS
-{
-#pragma unused(arg1, arg2)
-
- int error, pid = 0;
-
- error = sysctl_handle_int(oidp, &pid, 0, req);
- if (error || !req->newptr)
- return (error);
-
- return vm_dispatch_pressure_note_to_pid(pid, FALSE);
-}
-
-SYSCTL_PROC(_kern, OID_AUTO, memorystatus_vm_pressure_send, CTLTYPE_INT|CTLFLAG_WR|CTLFLAG_LOCKED|CTLFLAG_MASKED,
- 0, 0, &sysctl_memorystatus_vm_pressure_send, "I", "");
-
#endif /* VM_PRESSURE_EVENTS */
#endif /* CONFIG_JETSAM */
-#endif /* DEVELOPMENT || DEBUG */
-
#if CONFIG_FREEZE
+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_threshold, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_freeze_threshold, 0, "");
SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_pages_min, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_freeze_pages_min, 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, "");
+#define VM_PAGES_FOR_ALL_PROCS (2)
/*
- * Enabled via: <rdar://problem/13248767> Enable the sysctl_memorystatus_freeze/thaw sysctls on Release KC
- *
- * TODO: Manual trigger of freeze and thaw for dev / debug kernels only.
- * <rdar://problem/13248795> Disable/restrict the sysctl_memorystatus_freeze/thaw sysctls on Release KC
+ * Manual trigger of freeze and thaw for dev / debug kernels only.
*/
static int
sysctl_memorystatus_freeze SYSCTL_HANDLER_ARGS
{
#pragma unused(arg1, arg2)
-
int error, pid = 0;
proc_t p;
+ if (memorystatus_freeze_enabled == FALSE) {
+ return ENOTSUP;
+ }
+
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();
+
+ return 0;
+ }
+
+ lck_mtx_lock(&freezer_mutex);
+
p = proc_find(pid);
if (p != NULL) {
uint32_t purgeable, wired, clean, dirty;
boolean_t shared;
uint32_t max_pages = 0;
- if (DEFAULT_FREEZER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) {
- max_pages = MIN(default_pager_swap_pages_free(), memorystatus_freeze_pages_max);
+ if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
+
+ unsigned int avail_swap_space = 0; /* in pages. */
+
+ /*
+ * Freezer backed by the compressor and swap file(s)
+ * while will hold compressed data.
+ */
+ avail_swap_space = vm_swap_get_free_space() / PAGE_SIZE_64;
+
+ max_pages = MIN(avail_swap_space, memorystatus_freeze_pages_max);
+
} else {
+ /*
+ * We only have the compressor without any swap.
+ */
max_pages = UINT32_MAX - 1;
}
+
error = task_freeze(p->task, &purgeable, &wired, &clean, &dirty, max_pages, &shared, FALSE);
proc_rele(p);
if (error)
error = EIO;
+
+ lck_mtx_unlock(&freezer_mutex);
return error;
}
+
+ lck_mtx_unlock(&freezer_mutex);
return EINVAL;
}
int error, pid = 0;
proc_t p;
+ if (memorystatus_freeze_enabled == FALSE) {
+ return ENOTSUP;
+ }
+
error = sysctl_handle_int(oidp, &pid, 0, req);
if (error || !req->newptr)
return (error);
- p = proc_find(pid);
- if (p != NULL) {
- error = task_thaw(p->task);
- proc_rele(p);
-
- if (error)
- error = EIO;
- return error;
+ 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);
+ proc_rele(p);
+
+ if (error)
+ error = EIO;
+ return error;
+ }
}
return EINVAL;
#endif /* CONFIG_FREEZE */
+#endif /* DEVELOPMENT || DEBUG */
+
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);
+
+ lck_mtx_lock(&disconnect_page_mappings_mutex);
+
+ if (pid == -1) {
+ vm_pageout_disconnect_all_pages();
+ } else {
+ p = proc_find(pid);
+
+ if (p != NULL) {
+ error = task_disconnect_page_mappings(p->task);
+
+ proc_rele(p);
+
+ if (error)
+ error = EIO;
+ } 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", "");
+
+#endif /* DEVELOPMENT || DEBUG */
+
+
+
+#if CONFIG_JETSAM
+/*
+ * 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)
+{
+ int coal_sort_order;
+
+ /*
+ * Verify the jetsam priority
+ */
+ if (bucket_index >= MEMSTAT_BUCKET_COUNT) {
+ return(EINVAL);
+ }
+
+#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);
+ }
+#endif
+
+ proc_list_lock();
+ 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);
+ }
+ 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.
+ */
+
+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;
+
+ if (bucket_index >= MEMSTAT_BUCKET_COUNT) {
+ return;
+ }
+
+ current_bucket = &memstat_bucket[bucket_index];
+
+ p = TAILQ_FIRST(¤t_bucket->list);
+
+ while (p) {
+ memorystatus_get_task_page_counts(p->task, &pages, NULL, 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, 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;
+ }
+
+ insert_after_proc = max_proc;
+
+ p = TAILQ_NEXT(max_proc, p_memstat_list);
+ }
+}
+
+#endif /* CONFIG_JETSAM */
+
static proc_t memorystatus_get_first_proc_locked(unsigned int *bucket_index, boolean_t search) {
memstat_bucket_t *current_bucket;
proc_t next_p;
kern_return_t result;
int i;
- nanoseconds_to_absolutetime((uint64_t)DEFERRED_IDLE_EXIT_TIME_SECS * NSEC_PER_SEC, &memorystatus_idle_delay_time);
+#if CONFIG_FREEZE
+ memorystatus_freeze_pages_min = FREEZE_PAGES_MIN;
+ memorystatus_freeze_pages_max = FREEZE_PAGES_MAX;
+#endif
+
+#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);
+
+ lck_mtx_init(&disconnect_page_mappings_mutex, disconnect_page_mappings_lck_grp, NULL);
+#endif
+
+ 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);
/* Init buckets */
for (i = 0; i < MEMSTAT_BUCKET_COUNT; i++) {
/* 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_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;
+
+ 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;
+
+ 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;
+ }
+
+ /*
+ * 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 CONFIG_JETSAM
+ /* 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));
+ }
+
memorystatus_delta = delta_percentage * atop_64(max_mem) / 100;
-#if !LATENCY_JETSAM
memorystatus_available_pages_critical_idle_offset = idle_offset_percentage * atop_64(max_mem) / 100;
-#endif
-
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_jetsam_snapshot_max = maxproc;
memorystatus_jetsam_snapshot =
panic("Could not allocate memorystatus_jetsam_snapshot");
}
+ nanoseconds_to_absolutetime((uint64_t)JETSAM_SNAPSHOT_TIMEOUT_SECS * NSEC_PER_SEC, &memorystatus_jetsam_snapshot_timeout);
+
+ memset(&memorystatus_at_boot_snapshot, 0, sizeof(memorystatus_jetsam_snapshot_t));
+
/* No contention at this point */
memorystatus_update_levels_locked(FALSE);
+
+ /* 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 */
+ }
#endif
#if CONFIG_FREEZE
/* Centralised for the purposes of allowing panic-on-jetsam */
extern void
-vm_wake_compactor_swapper(void);
-
-static boolean_t
-memorystatus_do_kill(proc_t p, uint32_t cause) {
-
- int retval = 0;
+vm_run_compactor(void);
-#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
+/*
+ * 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);
+}
+
+/*
+ * 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;
+
+ KERNEL_DEBUG_CONSTANT( (BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DO_KILL)) | DBG_FUNC_START,
+ victim_pid, cause, vm_page_free_count, 0, 0);
+
+ 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);
}
case kMemorystatusKilledVnodes: jetsam_flags |= P_JETSAM_VNODE; break;
case kMemorystatusKilledVMPageShortage: jetsam_flags |= P_JETSAM_VMPAGESHORTAGE; break;
case kMemorystatusKilledVMThrashing: 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;
}
- retval = exit1_internal(p, W_EXITCODE(0, SIGKILL), (int *)NULL, FALSE, FALSE, jetsam_flags);
+ error = jetsam_do_kill(p, jetsam_flags, jetsam_reason);
- if (COMPRESSED_PAGER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) {
- vm_wake_compactor_swapper();
- }
-
- return (retval == 0);
+ KERNEL_DEBUG_CONSTANT( (BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DO_KILL)) | DBG_FUNC_END,
+ victim_pid, cause, vm_page_free_count, error, 0);
+
+ vm_run_compactor();
+
+ return (error == 0);
}
/*
#endif
}
+/*
+ * 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
+ */
+
+int
+memorystatus_update_inactive_jetsam_priority_band(pid_t pid, uint32_t op_flags, boolean_t effective_now)
+{
+ int error = 0;
+ boolean_t enable = FALSE;
+ proc_t p = NULL;
+
+ 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 {
+
+ proc_list_lock();
+
+ if (enable) {
+ p->p_memstat_state |= P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND;
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+
+ if (effective_now) {
+ if (p->p_memstat_effectivepriority < JETSAM_PRIORITY_ELEVATED_INACTIVE) {
+ boolean_t trigger_exception;
+ CACHE_ACTIVE_LIMITS_LOCKED(p, trigger_exception);
+ task_set_phys_footprint_limit_internal(p->task, (p->p_memstat_memlimit > 0) ? p->p_memstat_memlimit : -1, NULL, trigger_exception);
+ memorystatus_update_priority_locked(p, JETSAM_PRIORITY_ELEVATED_INACTIVE, 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 (effective_now) {
+ if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_ELEVATED_INACTIVE) {
+ memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, FALSE, TRUE);
+ }
+ } else {
+ if (isProcessInAgingBands(p)) {
+ memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, FALSE, TRUE);
+ }
+ }
+ }
+
+ proc_list_unlock();
+ }
+ proc_rele(p);
+ error = 0;
+
+ } else {
+ error = ESRCH;
+ }
+
+ return error;
+}
+
static void
memorystatus_perform_idle_demotion(__unused void *spare1, __unused void *spare2)
{
proc_t p;
- uint64_t current_time;
+ uint64_t current_time = 0, idle_delay_time = 0;
+ int demote_prio_band = 0;
memstat_bucket_t *demotion_bucket;
MEMORYSTATUS_DEBUG(1, "memorystatus_perform_idle_demotion()\n");
proc_list_lock();
- demotion_bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE_DEFERRED];
- p = TAILQ_FIRST(&demotion_bucket->list);
-
- while (p) {
- MEMORYSTATUS_DEBUG(1, "memorystatus_perform_idle_demotion() found %d\n", p->p_pid);
-
- assert(p->p_memstat_idledeadline);
- assert(p->p_memstat_dirty & P_DIRTY_DEFER_IN_PROGRESS);
- assert((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_IS_DIRTY)) == P_DIRTY_IDLE_EXIT_ENABLED);
-
- if (current_time >= p->p_memstat_idledeadline) {
-#if DEBUG || DEVELOPMENT
- if (!(p->p_memstat_dirty & P_DIRTY_MARKED)) {
- printf("memorystatus_perform_idle_demotion: moving process %d to idle band, but never dirtied (0x%x)!\n", p->p_pid, p->p_memstat_dirty);
- }
-#endif
- memorystatus_invalidate_idle_demotion_locked(p, TRUE);
- memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE);
-
- // The prior process has moved out of the demotion bucket, so grab the new head and continue
- p = TAILQ_FIRST(&demotion_bucket->list);
+ demote_prio_band = JETSAM_PRIORITY_IDLE + 1;
+
+ 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;
+
+ 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);
+
+ assert(p->p_memstat_idledeadline);
+
+ assert(p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS);
+
+ 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;
+
+ p->p_memstat_idledeadline += idle_delay_time;
+ p = TAILQ_NEXT(p, p_memstat_list);
+
+ } else {
+
+ proc_t next_proc = NULL;
+
+ 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;
+ }
}
-
- // No further candidates
- break;
+
}
-
+
memorystatus_reschedule_idle_demotion_locked();
proc_list_unlock();
static void
memorystatus_schedule_idle_demotion_locked(proc_t p, boolean_t set_state)
{
- MEMORYSTATUS_DEBUG(1, "memorystatus_schedule_idle_demotion_locked: scheduling demotion to idle band for process %d (dirty:0x%x, set_state %d, demotions %d).\n",
- p->p_pid, p->p_memstat_dirty, set_state, memorystatus_scheduled_idle_demotions);
+ boolean_t present_in_sysprocs_aging_bucket = FALSE;
+ boolean_t present_in_apps_aging_bucket = FALSE;
+ uint64_t idle_delay_time = 0;
+
+ if (jetsam_aging_policy == kJetsamAgingPolicyNone) {
+ return;
+ }
+
+ 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;
+ }
+
+ 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) {
+ present_in_sysprocs_aging_bucket = TRUE;
+
+ } else if (isApp(p) && applications_aging_band) {
+ present_in_apps_aging_bucket = TRUE;
+ }
+ }
+
+ assert(!present_in_sysprocs_aging_bucket);
+ assert(!present_in_apps_aging_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));
- assert((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_DEFER_IN_PROGRESS)) == (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_DEFER_IN_PROGRESS));
+ if(isSysProc(p)) {
+ assert((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED);
+ }
+
+ idle_delay_time = (isSysProc(p)) ? memorystatus_sysprocs_idle_delay_time : memorystatus_apps_idle_delay_time;
if (set_state) {
- assert(p->p_memstat_idledeadline == 0);
- p->p_memstat_idledeadline = mach_absolute_time() + memorystatus_idle_delay_time;
+ p->p_memstat_dirty |= P_DIRTY_AGING_IN_PROGRESS;
+ p->p_memstat_idledeadline = mach_absolute_time() + idle_delay_time;
}
- assert(p->p_memstat_idledeadline);
+ assert(p->p_memstat_idledeadline);
- memorystatus_scheduled_idle_demotions++;
+ 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 void
memorystatus_invalidate_idle_demotion_locked(proc_t p, boolean_t clear_state)
{
- MEMORYSTATUS_DEBUG(1, "memorystatus_invalidate_idle_demotion(): invalidating demotion to idle band for process %d (clear_state %d, demotions %d).\n",
- p->p_pid, clear_state, memorystatus_scheduled_idle_demotions);
+ boolean_t present_in_sysprocs_aging_bucket = FALSE;
+ boolean_t present_in_apps_aging_bucket = FALSE;
+
+ if (!system_procs_aging_band && !applications_aging_band) {
+ return;
+ }
+
+ 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;
+ }
+ }
+
+ 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));
- assert(p->p_memstat_idledeadline);
if (clear_state) {
p->p_memstat_idledeadline = 0;
- p->p_memstat_dirty &= ~P_DIRTY_DEFER_IN_PROGRESS;
+ p->p_memstat_dirty &= ~P_DIRTY_AGING_IN_PROGRESS;
}
- memorystatus_scheduled_idle_demotions--;
- assert(memorystatus_scheduled_idle_demotions >= 0);
+ 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);
+ }
+
+ assert((memorystatus_scheduled_idle_demotions_sysprocs + memorystatus_scheduled_idle_demotions_apps) >= 0);
}
static void
memorystatus_reschedule_idle_demotion_locked(void) {
- if (0 == memorystatus_scheduled_idle_demotions) {
+ 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);
}
} else {
memstat_bucket_t *demotion_bucket;
- proc_t p;
- demotion_bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE_DEFERRED];
- p = TAILQ_FIRST(&demotion_bucket->list);
- 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;
+ proc_t p = NULL, p1 = NULL, p2 = NULL;
+
+ if (system_procs_aging_band) {
+
+ demotion_bucket = &memstat_bucket[system_procs_aging_band];
+ p1 = TAILQ_FIRST(&demotion_bucket->list);
+
+ p = p1;
+ }
+
+ if (applications_aging_band) {
+
+ demotion_bucket = &memstat_bucket[applications_aging_band];
+ p2 = TAILQ_FIRST(&demotion_bucket->list);
+
+ if (p1 && p2) {
+ p = (p1->p_memstat_idledeadline > p2->p_memstat_idledeadline) ? p2 : p1;
+ } else {
+ p = (p1 == NULL) ? p2 : p1;
+ }
+
+ }
+
+ 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;
+ }
}
}
}
{
memstat_bucket_t *bucket;
- MEMORYSTATUS_DEBUG(1, "memorystatus_list_add(): adding process %d with priority %d.\n", p->pid, priority);
-
+ MEMORYSTATUS_DEBUG(1, "memorystatus_list_add(): adding pid %d with priority %d.\n", p->p_pid, p->p_memstat_effectivepriority);
+
if (!locked) {
proc_list_lock();
}
-
+
+ DTRACE_MEMORYSTATUS2(memorystatus_add, proc_t, p, int32_t, p->p_memstat_effectivepriority);
+
/* Processes marked internal do not have priority tracked */
if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
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();
+ }
+
TAILQ_INSERT_TAIL(&bucket->list, p, p_memstat_list);
bucket->count++;
return 0;
}
-static void
-memorystatus_update_priority_locked(proc_t p, int priority)
+/*
+ * 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;
if ((p->p_listflag & P_LIST_EXITED) != 0) {
return;
}
-
- MEMORYSTATUS_DEBUG(1, "memorystatus_update_priority_locked(): setting process %d to priority %d\n", p->p_pid, priority);
+
+ 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");
+
+ DTRACE_MEMORYSTATUS3(memorystatus_update_priority, proc_t, p, int32_t, p->p_memstat_effectivepriority, int, priority);
+
+#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 */
+#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.
+ */
+
+ if (priority <= JETSAM_PRIORITY_ELEVATED_INACTIVE && (p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND)) {
+ 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 JETSAM_PRIORITY_ELEVATED_INACTIVE band.
+ * - it is a normal application, then let it age in the aging band if that policy is in effect.
+ */
+
+ if (priority <= JETSAM_PRIORITY_ELEVATED_INACTIVE && (p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND)) {
+ 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 ((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);
+ }
+ }
+ }
+ }
+ }
+
+ 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);
+ }
+
TAILQ_REMOVE(&old_bucket->list, p, p_memstat_list);
old_bucket->count--;
-
+
new_bucket = &memstat_bucket[priority];
- TAILQ_INSERT_TAIL(&new_bucket->list, p, p_memstat_list);
+ 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 CONFIG_JETSAM
- if (memorystatus_highwater_enabled && (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_BACKGROUND)) {
- if (((priority >= JETSAM_PRIORITY_FOREGROUND) && (p->p_memstat_effectivepriority < JETSAM_PRIORITY_FOREGROUND)) ||
- ((priority < JETSAM_PRIORITY_FOREGROUND) && (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND))) {
- int32_t memlimit = (priority >= JETSAM_PRIORITY_FOREGROUND) ? -1 : p->p_memstat_memlimit;
- task_set_phys_footprint_limit_internal(p->task, (memlimit > 0) ? memlimit : -1, NULL, TRUE);
+
+ if (memorystatus_highwater_enabled) {
+ boolean_t trigger_exception;
+
+ /*
+ * If cached limit data is updated, then the limits
+ * will be enforced by writing to the ledgers.
+ */
+ boolean_t ledger_update_needed = TRUE;
+
+ /*
+ * No need to consider P_MEMSTAT_MEMLIMIT_BACKGROUND anymore.
+ * Background limits are described via the inactive limit slots.
+ *
+ * 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, trigger_exception);
+ } 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, trigger_exception);
+
+ } 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, trigger_exception);
+ } 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, trigger_exception);
+
+ 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") : ""));
}
}
-#endif
-
+
+ /*
+ * 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;
+ }
+ } else if (priority == JETSAM_PRIORITY_IDLE) {
+ /*
+ * Transitioning into the idle priority bucket.
+ * Record idle start.
+ */
+ p->p_memstat_idle_start = mach_absolute_time();
+ }
+
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.
+ *
+ * memlimit_background This process has a high-water-mark while in the background.
+ * No longer meaningful. Background limits are described via
+ * the inactive slots. Flag is ignored.
+ *
+ *
+ * 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, boolean_t memlimit_background)
+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,
+ __unused boolean_t memlimit_background)
{
int ret;
-
-#if !CONFIG_JETSAM
-#pragma unused(update_memlimit, memlimit, memlimit_background)
-#endif
+ 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);
- MEMORYSTATUS_DEBUG(1, "memorystatus_update: changing process %d: priority %d, user_data 0x%llx\n", 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 == JETSAM_PRIORITY_IDLE_DEFERRED) {
- /* JETSAM_PRIORITY_IDLE_DEFERRED is reserved for internal use; if requested, adjust to JETSAM_PRIORITY_IDLE. */
+ } 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", pid);
+ 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;
p->p_memstat_requestedpriority = priority;
-
-#if CONFIG_JETSAM
+
if (update_memlimit) {
- p->p_memstat_memlimit = memlimit;
+ boolean_t trigger_exception;
+
+ /*
+ * 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_background) {
- /* Will be set as priority is updated */
- p->p_memstat_state |= P_MEMSTAT_MEMLIMIT_BACKGROUND;
- } else {
- /* Otherwise, apply now */
- if (memorystatus_highwater_enabled) {
- task_set_phys_footprint_limit_internal(p->task, (memlimit > 0) ? memlimit : -1, NULL, TRUE);
+
+ /*
+ * With 2-level HWM support, we no longer honor P_MEMSTAT_MEMLIMIT_BACKGROUND.
+ * Background limits are described via the inactive limit slots.
+ */
+
+ // p->p_memstat_state |= P_MEMSTAT_MEMLIMIT_BACKGROUND;
+
+#if DEVELOPMENT || DEBUG
+ printf("memorystatus_update: WARNING %s[%d] set unused flag P_MEMSTAT_MEMLIMIT_BACKGROUND [A==%dMB %s] [IA==%dMB %s]\n",
+ (*p->p_name ? p->p_name : "unknown"), p->p_pid,
+ memlimit_active, (memlimit_active_is_fatal ? "F " : "NF"),
+ memlimit_inactive, (memlimit_inactive_is_fatal ? "F " : "NF"));
+#endif /* DEVELOPMENT || DEBUG */
+ }
+
+ 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, trigger_exception);
+ } else {
+ CACHE_INACTIVE_LIMITS_LOCKED(p, trigger_exception);
+ }
+
+ /*
+ * Enforce the cached limit by writing to the ledger.
+ */
+ if (memorystatus_highwater_enabled) {
+ /* apply now */
+ assert(trigger_exception == TRUE);
+ task_set_phys_footprint_limit_internal(p->task, ((p->p_memstat_memlimit > 0) ? p->p_memstat_memlimit : -1), NULL, trigger_exception);
+
+ 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") : ""));
}
}
-#endif
- memorystatus_update_priority_locked(p, priority);
+ /*
+ * 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;
{
int ret;
memstat_bucket_t *bucket;
+ boolean_t reschedule = FALSE;
- MEMORYSTATUS_DEBUG(1, "memorystatus_list_remove: removing process %d\n", pid);
+ 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 (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE_DEFERRED) {
+ if (reschedule) {
memorystatus_invalidate_idle_demotion_locked(p, TRUE);
memorystatus_reschedule_idle_demotion_locked();
}
return ret;
}
-static boolean_t
+/*
+ * 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 FALSE;
+ return EBUSY;
}
/* Idle exit requires that process be tracked */
if ((pcontrol & PROC_DIRTY_ALLOW_IDLE_EXIT) &&
!(pcontrol & PROC_DIRTY_TRACK)) {
- return FALSE;
+ 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;
}
/* Deferral is only relevant if idle exit is specified */
if ((pcontrol & PROC_DIRTY_DEFER) &&
!(pcontrol & PROC_DIRTY_ALLOWS_IDLE_EXIT)) {
- return FALSE;
+ return EINVAL;
}
- return TRUE;
+ 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_DEFER_IN_PROGRESS) ? JETSAM_PRIORITY_IDLE_DEFERRED : JETSAM_PRIORITY_IDLE;
+
+ priority = (p->p_memstat_dirty & P_DIRTY_AGING_IN_PROGRESS) ? system_procs_aging_band : JETSAM_PRIORITY_IDLE;
} else {
priority = p->p_memstat_requestedpriority;
}
- memorystatus_update_priority_locked(p, priority);
+ 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.
+ */
+ memorystatus_update_priority_locked(p, priority, false, true);
+
+ } else {
+ memorystatus_update_priority_locked(p, priority, false, false);
+ }
+ }
}
/*
* 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_idle_delay_time); if they go clean during this time, then they will be moved to a deferred-idle band
+ * 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.
memorystatus_dirty_track(proc_t p, uint32_t pcontrol) {
unsigned int old_dirty;
boolean_t reschedule = FALSE;
- int ret;
+ 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 (!memorystatus_validate_track_flags(p, pcontrol)) {
- ret = EINVAL;
+ if ((ret = memorystatus_validate_track_flags(p, pcontrol)) != 0) {
+ /* error */
goto exit;
- }
+ }
old_dirty = p->p_memstat_dirty;
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) && !(old_dirty & P_DIRTY_DEFER)) {
- p->p_memstat_dirty |= (P_DIRTY_DEFER|P_DIRTY_DEFER_IN_PROGRESS);
- } else {
- p->p_memstat_dirty &= ~P_DIRTY_DEFER_IN_PROGRESS;
+ if (pcontrol & PROC_DIRTY_DEFER) {
+
+ if ( !(old_dirty & P_DIRTY_DEFER)) {
+ p->p_memstat_dirty |= P_DIRTY_DEFER;
+ }
+
+ defer_now = TRUE;
}
- MEMORYSTATUS_DEBUG(1, "memorystatus_on_track_dirty(): set idle-exit %s / deferred %s / dirty %s for process %d\n",
+ 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",
- p->p_memstat_dirty & P_DIRTY_DEFER_IN_PROGRESS ? "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) &&
- (p->p_memstat_dirty & P_DIRTY_DEFER_IN_PROGRESS) && !(old_dirty & P_DIRTY_DEFER_IN_PROGRESS)) {
- memorystatus_schedule_idle_demotion_locked(p, TRUE);
- reschedule = TRUE;
- } else if (!(p->p_memstat_dirty & P_DIRTY_DEFER_IN_PROGRESS) && (old_dirty & P_DIRTY_DEFER_IN_PROGRESS)) {
+ 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;
}
}
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;
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)) {
+ 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;
if (ret != 0) {
goto exit;
}
-
+
if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY)
now_dirty = TRUE;
(was_dirty == FALSE && now_dirty == TRUE)) {
/* Manage idle exit deferral, if applied */
- if ((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_DEFER_IN_PROGRESS)) ==
- (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_DEFER_IN_PROGRESS)) {
+ 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.
+ *
+ * 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) {
- memorystatus_invalidate_idle_demotion_locked(p, FALSE);
+ /*
+ * 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 {
- /* We evaluate lazily, so reset the idle-deadline if it's expired by the time the process becomes clean. */
- if (mach_absolute_time() >= p->p_memstat_idledeadline) {
- p->p_memstat_idledeadline = 0;
- p->p_memstat_dirty &= ~P_DIRTY_DEFER_IN_PROGRESS;
+
+ /*
+ * Process is back from "dirty" to "clean".
+ */
+
+ if (jetsam_aging_policy == kJetsamAgingPolicyLegacy) {
+ if (mach_absolute_time() >= p->p_memstat_idledeadline) {
+ /*
+ * The process' 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 {
+ /*
+ * 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_AGING_IN_PROGRESS) {
+ memorystatus_schedule_idle_demotion_locked(p, FALSE);
+ reschedule = TRUE;
+ }
+ }
} else {
- memorystatus_schedule_idle_demotion_locked(p, FALSE);
+
+ memorystatus_schedule_idle_demotion_locked(p, TRUE);
reschedule = TRUE;
}
}
}
-
+
memorystatus_update_idle_priority_locked(p);
+
+ if (memorystatus_highwater_enabled) {
+ boolean_t trigger_exception = FALSE, ledger_update_needed = TRUE;
+ /*
+ * 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 dirty
+ */
+ CACHE_ACTIVE_LIMITS_LOCKED(p, trigger_exception);
+ 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, trigger_exception);
+ 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, trigger_exception);
+ 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) {
- psignal(p, SIGKILL);
+ if (proc_ref_locked(p) == p) {
+ proc_list_unlock();
+ psignal(p, SIGKILL);
+ proc_list_lock();
+ proc_rele_locked(p);
+ }
}
exit:
}
int
-memorystatus_dirty_get(proc_t p) {
+memorystatus_dirty_clear(proc_t p, uint32_t pcontrol) {
+
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;
- }
- }
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_dirty_clear(): %d 0x%x 0x%x\n", p->p_pid, pcontrol, p->p_memstat_dirty);
- proc_list_unlock();
-
- return ret;
-}
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DIRTY_CLEAR), p->p_pid, pcontrol, 0, 0, 0);
-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;
-}
+ 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)) == 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) {
+
+ if (p->p_memstat_dirty & P_DIRTY_DEFER) {
+
+ p->p_memstat_dirty &= ~P_DIRTY_DEFER;
+
+ 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);
+ memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL, NULL);
#endif
proc_list_lock();
#if CONFIG_FREEZE
#endif
}
+/*
+ * The proc_list_lock is held by the caller.
+*/
static uint32_t
memorystatus_build_state(proc_t p) {
uint32_t snapshot_state = 0;
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);
proc_list_unlock();
if (victim_p) {
- printf("memorystatus_thread: idle exiting pid %d [%s]\n", victim_p->p_pid, (victim_p->p_comm ? victim_p->p_comm : "(unknown)"));
- killed = memorystatus_do_kill(victim_p, kMemorystatusKilledIdleExit);
+ printf("memorystatus_thread: idle exiting 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;
}
#endif
+#if CONFIG_JETSAM
static void
memorystatus_thread_wake(void) {
thread_wakeup((event_t)&memorystatus_wakeup);
}
+#endif /* CONFIG_JETSAM */
+
+extern void vm_pressure_response(void);
static int
memorystatus_thread_block(uint32_t interval_ms, thread_continue_t continuation)
return thread_block(continuation);
}
-extern boolean_t vm_compressor_thrashing_detected;
-extern uint64_t vm_compressor_total_compressions(void);
-
static void
memorystatus_thread(void *param __unused, wait_result_t wr __unused)
{
static boolean_t is_vm_privileged = FALSE;
+
#if CONFIG_JETSAM
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;
+
+ /* 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_idle_kills = 0; /* Number of procs killed during eval period */
+ 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;
#endif
if (is_vm_privileged == FALSE) {
thread_wire(host_priv_self(), current_thread(), TRUE);
is_vm_privileged = TRUE;
+ if (vm_restricted_to_single_processor == TRUE)
+ thread_vm_bind_group_add();
+
memorystatus_thread_block(0, memorystatus_thread);
}
#if CONFIG_JETSAM
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_SCAN) | DBG_FUNC_START,
- memorystatus_available_pages, 0, 0, 0, 0);
+ memorystatus_available_pages, memorystatus_jld_enabled, memorystatus_jld_eval_period_msecs, memorystatus_jld_eval_aggressive_count,0);
- uint32_t cause = vm_compressor_thrashing_detected ? kMemorystatusKilledVMThrashing : kMemorystatusKilledVMPageShortage;
-
- /* Jetsam aware version.
+ /*
+ * Jetsam aware version.
*
- * If woken under pressure, go down the path of killing:
+ * The VM pressure notification thread is working it's way through clients in parallel.
*
- * - processes exceeding their highwater mark if no clean victims available
- * - the least recently used process if no highwater mark victims available
+ * 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).
*/
-#if !LATENCY_JETSAM
- while (vm_compressor_thrashing_detected || memorystatus_available_pages <= memorystatus_available_pages_critical) {
-#else
- while (kill_under_pressure) {
- const uint32_t SNAPSHOT_WAIT_TIMEOUT_MS = 100;
- wait_result_t wait_result;
-#endif
+ while (is_thrashing(kill_under_pressure_cause) ||
+ memorystatus_available_pages <= memorystatus_available_pages_pressure) {
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 kMemorystatusKilledVMThrashing:
+ jetsam_reason_code = JETSAM_REASON_MEMORY_VMTHRASHING;
+ break;
+ case kMemorystatusKilledVMPageShortage:
+ /* falls through */
+ default:
+ jetsam_reason_code = JETSAM_REASON_MEMORY_VMPAGESHORTAGE;
+ cause = kMemorystatusKilledVMPageShortage;
+ break;
+ }
-#if LEGACY_HIWATER
/* Highwater */
killed = memorystatus_kill_hiwat_proc(&errors);
if (killed) {
+ hwm_kill++;
post_snapshot = TRUE;
goto done;
+ } else {
+ memorystatus_hwm_candidates = FALSE;
}
-#endif
+
+ /* No highwater processes to kill. Continue or stop for now? */
+ if (!is_thrashing(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
+ * - no more HWM processes left.
+ * For now, don't kill any other processes.
+ */
+ if (hwm_kill == 0) {
+ memorystatus_thread_wasted_wakeup++;
+ }
+
+ break;
+ }
+
+ 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_jld_enabled == TRUE) {
+
+ /*
+ * 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(
+ kMemorystatusKilledVMThrashing,
+ jetsam_reason,
+ jld_eval_aggressive_count,
+ &errors);
+
+ if (killed) {
+ post_snapshot = TRUE;
+ if (memorystatus_available_pages <= memorystatus_available_pages_pressure) {
+ /*
+ * Still under pressure.
+ * Find another pinned processes.
+ */
+ continue;
+ } else {
+ goto done;
+ }
+ } else {
+ /*
+ * No pinned processes left to kill.
+ * Abandon elevated band.
+ */
+ break;
+ }
+ }
+
+ /*
+ * memorystatus_kill_top_process_aggressive() 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_top_process_aggressive(
+ TRUE,
+ kMemorystatusKilledVMThrashing,
+ jetsam_reason,
+ jld_eval_aggressive_count,
+ jld_priority_band_max,
+ &errors);
+
+ if (killed) {
+ /* Always generate logs after aggressive kill */
+ post_snapshot = TRUE;
+ jld_idle_kills = 0;
+ 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, cause, &priority, &errors);
+ killed = memorystatus_kill_top_process(TRUE, sort_flag, cause, jetsam_reason, &priority, &errors);
+ sort_flag = FALSE;
+
if (killed) {
- if (!kill_under_pressure && (priority != JETSAM_PRIORITY_IDLE)) {
- /* Don't generate logs for steady-state idle-exit kills */
+ /*
+ * Don't generate logs for steady-state idle-exit kills,
+ * unless it is overridden for debug or by the device
+ * tree.
+ */
+ if ((priority != JETSAM_PRIORITY_IDLE) || memorystatus_idle_snapshot) {
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;
}
-
- /* Under pressure and unable to kill a process - panic */
- panic("memorystatus_jetsam_thread: no victim! available pages:%d\n", memorystatus_available_pages);
+
+ if (memorystatus_available_pages <= memorystatus_available_pages_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_available_pages <= memorystatus_available_pages_critical) {
+ /*
+ * Still under pressure and unable to kill a process - panic
+ */
+ panic("memorystatus_jetsam_thread: no victim! available pages:%d\n", memorystatus_available_pages);
+ }
+ }
done:
- kill_under_pressure = FALSE;
- vm_compressor_thrashing_detected = FALSE;
-
-#if LATENCY_JETSAM
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_LATENCY_COALESCE) | DBG_FUNC_START,
- memorystatus_available_pages, 0, 0, 0, 0);
- thread_wakeup((event_t)&latency_jetsam_wakeup);
- /*
- * Coalesce snapshot reports in the face of repeated jetsams by blocking here with a timeout.
- * If the wait expires, issue the note.
+
+ /*
+ * We do not want to over-kill when thrashing has been detected.
+ * To avoid that, we reset the flag here and notify the
+ * compressor.
*/
- wait_result = memorystatus_thread_block(SNAPSHOT_WAIT_TIMEOUT_MS, THREAD_CONTINUE_NULL);
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_LATENCY_COALESCE) | DBG_FUNC_END,
- memorystatus_available_pages, 0, 0, 0, 0);
- if (wait_result != THREAD_AWAKENED) {
- /* Catch-all */
- break;
+ if (is_thrashing(kill_under_pressure_cause)) {
+ kill_under_pressure_cause = 0;
+ vm_thrashing_jetsam_done();
}
-#endif
+
+ os_reason_free(jetsam_reason);
}
-
+
+ kill_under_pressure_cause = 0;
+
if (errors) {
memorystatus_clear_errors();
}
#if VM_PRESSURE_EVENTS
- memorystatus_update_vm_pressure(TRUE);
+ /*
+ * LD: We used to target the foreground process first and foremost here.
+ * Now, we target all processes, starting from the non-suspended, background
+ * processes first. We will target foreground too.
+ *
+ * memorystatus_update_vm_pressure(TRUE);
+ */
+ //vm_pressure_response();
#endif
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);
- memorystatus_jetsam_snapshot->notification_time = mach_absolute_time();
- memorystatus_send_note(kMemorystatusSnapshotNote, &snapshot_size, sizeof(snapshot_size));
+ 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);
#else /* CONFIG_JETSAM */
- /* Simple version.
- *
- * Jetsam not enabled, so just kill the first suitable clean process
- * and sleep.
+ /*
+ * Jetsam not enabled
*/
- if (kill_idle_exit) {
- kill_idle_exit_proc();
- kill_idle_exit = FALSE;
- }
-
#endif /* CONFIG_JETSAM */
memorystatus_thread_block(0, memorystatus_thread);
}
#if !CONFIG_JETSAM
+/*
+ * 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) {
- kill_idle_exit = TRUE;
- memorystatus_thread_wake();
- return TRUE;
+ return(kill_idle_exit_proc());
}
-#endif
+#endif /* !CONFIG_JETSAM */
-#if CONFIG_JETSAM
+/*
+ * Returns TRUE:
+ * when exceeding ledger footprint is fatal.
+ * Returns FALSE:
+ * when exceeding ledger footprint is non fatal.
+ */
+boolean_t
+memorystatus_turnoff_exception_and_get_fatalness(boolean_t warning, const int max_footprint_mb)
+{
+ proc_t p = current_proc();
+ boolean_t is_fatal;
+
+ proc_list_lock();
+
+ is_fatal = (p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT);
+
+ if (warning == FALSE) {
+ boolean_t is_active;
+ boolean_t state_changed = FALSE;
+
+ /*
+ * We are here because a process has exceeded its ledger limit.
+ * That is, the process is no longer in the limit warning range.
+ *
+ * When a process exceeds its ledger limit, we want an EXC_RESOURCE
+ * to trigger, but only once per process per limit. We enforce that
+ * here, by identifying the active/inactive limit type. We then turn
+ * off the exception state by marking the limit as exception triggered.
+ */
+
+ is_active = proc_jetsam_state_is_active_locked(p);
+
+ if (is_active == TRUE) {
+ /*
+ * turn off exceptions for active state
+ */
+ if (!(p->p_memstat_state & P_MEMSTAT_MEMLIMIT_ACTIVE_EXC_TRIGGERED)) {
+ p->p_memstat_state |= P_MEMSTAT_MEMLIMIT_ACTIVE_EXC_TRIGGERED;
+ state_changed = TRUE;
+ }
+ } else {
+ /*
+ * turn off exceptions for inactive state
+ */
+ if (!(p->p_memstat_state & P_MEMSTAT_MEMLIMIT_INACTIVE_EXC_TRIGGERED)) {
+ p->p_memstat_state |= P_MEMSTAT_MEMLIMIT_INACTIVE_EXC_TRIGGERED;
+ state_changed = TRUE;
+ }
+ }
+
+ /*
+ * The limit violation is logged here, but only once per process per limit.
+ * This avoids excessive logging when a process consistently exceeds a soft 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.
+ */
+ if(state_changed) {
+ printf("process %d (%s) exceeded physical memory footprint, the %s%sMemoryLimit of %d MB\n",
+ p->p_pid, (*p->p_name ? p->p_name : "unknown"), (is_active ? "Active" : "Inactive"),
+ (is_fatal ? "Hard" : "Soft"), max_footprint_mb);
+ }
+
+ }
+ proc_list_unlock();
+
+ return is_fatal;
+}
/*
* 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 system-wide task memory limit.
+ * as well as the fatal task memory limits.
*/
void
-memorystatus_on_ledger_footprint_exceeded(boolean_t warning, const int max_footprint_mb)
+memorystatus_on_ledger_footprint_exceeded(boolean_t warning, boolean_t is_fatal)
{
+ os_reason_t jetsam_reason = OS_REASON_NULL;
+
proc_t p = current_proc();
-
- printf("process %d (%s) %s physical memory footprint limit of %d MB\n",
- p->p_pid, p->p_comm,
- warning ? "approaching" : "exceeded",
- max_footprint_mb);
#if VM_PRESSURE_EVENTS
if (warning == TRUE) {
- if (memorystatus_warn_process(p->p_pid) != 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, FALSE /* not exceeded */) != TRUE) {
/* Print warning, since it's possible that task has not registered for pressure notifications */
- printf("task_exceeded_footprint: failed to warn the current task (exiting?).\n");
+ printf("task_exceeded_footprint: 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_memlimit <= 0) {
+ if (is_fatal) {
/*
- * If this process has no high watermark, then we have been invoked because the task
- * has violated the system-wide per-task memory limit.
+ * 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.
*/
- if (memorystatus_kill_process_sync(p->p_pid, kMemorystatusKilledPerProcessLimit) != TRUE) {
+ 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) {
+ /* 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, TRUE /* exceeded */);
+
+#endif /* VM_PRESSURE_EVENTS */
}
}
-static void
-memorystatus_get_task_page_counts(task_t task, uint32_t *footprint, uint32_t *max_footprint)
-{
- assert(task);
- assert(footprint);
-
- *footprint = (uint32_t)(get_task_phys_footprint(task) / PAGE_SIZE_64);
- if (max_footprint) {
- *max_footprint = (uint32_t)(get_task_phys_footprint_max(task) / PAGE_SIZE_64);
+/*
+ * Description:
+ * Evaluates active vs. inactive process state.
+ * 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_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 int
-memorystatus_send_note(int event_code, void *data, size_t data_length) {
- int ret;
- struct kev_msg ev_msg;
+static boolean_t
+memorystatus_kill_process_sync(pid_t victim_pid, uint32_t cause, os_reason_t jetsam_reason) {
+ boolean_t res;
+
+#if CONFIG_JETSAM
+ 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);
+ }
- ev_msg.vendor_code = KEV_VENDOR_APPLE;
- ev_msg.kev_class = KEV_SYSTEM_CLASS;
- ev_msg.kev_subclass = KEV_MEMORYSTATUS_SUBCLASS;
+ if (errors) {
+ memorystatus_clear_errors();
+ }
- ev_msg.event_code = event_code;
+ 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();
+ }
+ }
+#else /* !CONFIG_JETSAM */
- ev_msg.dv[0].data_length = data_length;
- ev_msg.dv[0].data_ptr = data;
- ev_msg.dv[1].data_length = 0;
+ res = memorystatus_kill_specific_process(victim_pid, cause, jetsam_reason);
- ret = kev_post_msg(&ev_msg);
- if (ret) {
- printf("%s: kev_post_msg() failed, err %d\n", __func__, ret);
+#endif /* CONFIG_JETSAM */
+
+ 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 CONFIG_JETSAM
+ 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();
+
+ printf("%lu.%02d memorystatus: specifically killing pid %d [%s] (%s %d) - memorystatus_available_pages: %d\n",
+ (unsigned long)tv_sec, tv_msec, victim_pid, (*p->p_name ? p->p_name : "(unknown)"),
+ jetsam_kill_cause_name[cause], p->p_memstat_effectivepriority, memorystatus_available_pages);
+#else /* !CONFIG_JETSAM */
+ proc_list_unlock();
+
+ killtime = mach_absolute_time();
+ absolutetime_to_microtime(killtime, &tv_sec, &tv_usec);
+ tv_msec = tv_usec / 1000;
+ printf("%lu.%02d memorystatus: specifically killing pid %d [%s] (%s %d)\n",
+ (unsigned long)tv_sec, tv_msec, victim_pid, (*p->p_name ? p->p_name : "(unknown)"),
+ jetsam_kill_cause_name[cause], p->p_memstat_effectivepriority);
+#endif /* CONFIG_JETSAM */
- return ret;
+ 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");
+ }
+}
+
+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);
+}
+
+static void
+memorystatus_get_task_page_counts(task_t task, uint32_t *footprint, uint32_t *max_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) {
+ pages = (get_task_phys_footprint_max(task) / PAGE_SIZE_64);
+ assert(((uint32_t)pages) == pages);
+ *max_footprint = (uint32_t)pages;
+ }
+ if (max_footprint_lifetime) {
+ pages = (get_task_resident_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_update_snapshot_locked(proc_t p, uint32_t kill_cause)
+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;
+ 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 (memorystatus_jetsam_snapshot_list[i].pid == p->p_pid) {
- /* Update if the priority has changed since the snapshot was taken */
- if (memorystatus_jetsam_snapshot_list[i].priority != p->p_memstat_effectivepriority) {
- memorystatus_jetsam_snapshot_list[i].priority = p->p_memstat_effectivepriority;
- strlcpy(memorystatus_jetsam_snapshot_list[i].name, p->p_comm, MAXCOMLEN+1);
- memorystatus_jetsam_snapshot_list[i].state = memorystatus_build_state(p);
- memorystatus_jetsam_snapshot_list[i].user_data = p->p_memstat_userdata;
- memorystatus_jetsam_snapshot_list[i].fds = p->p_fd->fd_nfiles;
+ 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;
}
- memorystatus_jetsam_snapshot_list[i].killed = kill_cause;
- return;
+
+ /*
+ * 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 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;
+ }
+
+ /*
+ * Always update the page counts on a kill.
+ */
+
+ uint32_t pages = 0;
+ uint32_t max_pages = 0;
+ uint32_t max_pages_lifetime = 0;
+ uint32_t purgeable_pages = 0;
+
+ memorystatus_get_task_page_counts(p->task, &pages, &max_pages, &max_pages_lifetime, &purgeable_pages);
+ entry->pages = (uint64_t)pages;
+ entry->max_pages = (uint64_t)max_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;
+
+ uint64_t region_count = 0;
+ memorystatus_get_task_memory_region_count(p->task, ®ion_count);
+ entry->jse_memory_region_count = region_count;
+
+ goto exit;
}
}
+
+ 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);
+
+ unsigned int next = memorystatus_jetsam_snapshot_count;
+
+ 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;
+
+ snapshot->entry_count = ++next;
+ memorystatus_jetsam_snapshot_count = next;
+
+ 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);
+ }
+ }
+ }
+ }
+
+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;
}
void memorystatus_pages_update(unsigned int pages_avail)
{
+ memorystatus_available_pages = pages_avail;
+
+#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 (memorystatus_available_pages <= memorystatus_available_pages_pressure) {
+
+ if (memorystatus_hwm_candidates || (memorystatus_available_pages <= memorystatus_available_pages_critical)) {
+ memorystatus_thread_wake();
+ }
+ }
+#else /* VM_PRESSURE_EVENTS */
+
boolean_t critical, delta;
if (!memorystatus_delta) {
|| (memorystatus_available_pages >= (pages_avail + memorystatus_delta))) ? TRUE : FALSE;
if (critical || delta) {
- memorystatus_available_pages = pages_avail;
- memorystatus_level = memorystatus_available_pages * 100 / atop_64(max_mem);
-
-#if LATENCY_JETSAM
- /* Bail early to avoid excessive wake-ups */
- if (critical) {
- return;
- }
-#endif
+ unsigned int total_pages;
+ 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 */
}
static boolean_t
-memorystatus_get_snapshot_properties_for_proc_locked(proc_t p, memorystatus_jetsam_snapshot_entry_t *entry)
+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 = 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];
+
memset(entry, 0, sizeof(memorystatus_jetsam_snapshot_entry_t));
-
+
entry->pid = p->p_pid;
- strlcpy(&entry->name[0], p->p_comm, MAXCOMLEN+1);
+ strlcpy(&entry->name[0], p->p_name, sizeof(entry->name));
entry->priority = p->p_memstat_effectivepriority;
- memorystatus_get_task_page_counts(p->task, &entry->pages, &entry->max_pages);
- entry->state = memorystatus_build_state(p);
+
+ memorystatus_get_task_page_counts(p->task, &pages, &max_pages, &max_pages_lifetime, &purgeable_pages);
+ entry->pages = (uint64_t)pages;
+ entry->max_pages = (uint64_t)max_pages;
+ entry->max_pages_lifetime = (uint64_t)max_pages_lifetime;
+ entry->purgeable_pages = (uint64_t)purgeable_pages;
+
+ 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;
+
+ 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 = tv_sec;
+ entry->cpu_time.tv_usec = tv_usec;
+
+ 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 */
+
+ entry->jse_idle_delta = p->p_memstat_idle_delta; /* Most recent timespan spent in idle-band */
+
+ proc_coalitionids(p, cids);
+ entry->jse_coalition_jetsam_id = cids[COALITION_TYPE_JETSAM];
return TRUE;
}
static void
-memorystatus_jetsam_snapshot_procs_locked(void)
+memorystatus_init_snapshot_vmstats(memorystatus_jetsam_snapshot_t *snapshot)
{
- proc_t p, next_p;
- unsigned int b = 0, i = 0;
kern_return_t kr = KERN_SUCCESS;
-
mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
vm_statistics64_data_t vm_stat;
if ((kr = host_statistics64(host_self(), HOST_VM_INFO64, (host_info64_t)&vm_stat, &count) != KERN_SUCCESS)) {
- printf("memorystatus_jetsam_snapshot_procs_locked: host_statistics64 failed with %d\n", kr);
- memset(&memorystatus_jetsam_snapshot->stats, 0, sizeof(memorystatus_jetsam_snapshot->stats));
+ printf("memorystatus_init_jetsam_snapshot_stats: host_statistics64 failed with %d\n", kr);
+ memset(&snapshot->stats, 0, sizeof(snapshot->stats));
} else {
- memorystatus_jetsam_snapshot->stats.free_pages = vm_stat.free_count;
- memorystatus_jetsam_snapshot->stats.active_pages = vm_stat.active_count;
- memorystatus_jetsam_snapshot->stats.inactive_pages = vm_stat.inactive_count;
- memorystatus_jetsam_snapshot->stats.throttled_pages = vm_stat.throttled_count;
- memorystatus_jetsam_snapshot->stats.purgeable_pages = vm_stat.purgeable_count;
- memorystatus_jetsam_snapshot->stats.wired_pages = vm_stat.wire_count;
-
- memorystatus_jetsam_snapshot->stats.speculative_pages = vm_stat.speculative_count;
- memorystatus_jetsam_snapshot->stats.filebacked_pages = vm_stat.external_page_count;
- memorystatus_jetsam_snapshot->stats.anonymous_pages = vm_stat.internal_page_count;
- memorystatus_jetsam_snapshot->stats.compressions = vm_stat.compressions;
- memorystatus_jetsam_snapshot->stats.decompressions = vm_stat.decompressions;
- memorystatus_jetsam_snapshot->stats.compressor_pages = vm_stat.compressor_page_count;
- memorystatus_jetsam_snapshot->stats.total_uncompressed_pages_in_compressor = vm_stat.total_uncompressed_pages_in_compressor;
+ 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;
+
+ 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;
+ }
+}
+
+/*
+ * 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();
+}
+
+static void
+memorystatus_init_jetsam_snapshot_locked(memorystatus_jetsam_snapshot_t *od_snapshot, uint32_t ods_list_count )
+{
+ proc_t p, next_p;
+ unsigned int b = 0, i = 0;
+
+ memorystatus_jetsam_snapshot_t *snapshot = NULL;
+ memorystatus_jetsam_snapshot_entry_t *snapshot_list = NULL;
+ unsigned int snapshot_max = 0;
+
+ if (od_snapshot) {
+ /*
+ * This is an on_demand snapshot
+ */
+ snapshot = od_snapshot;
+ snapshot_list = od_snapshot->entries;
+ snapshot_max = ods_list_count;
+ } else {
+ /*
+ * This is a jetsam event snapshot
+ */
+ snapshot = memorystatus_jetsam_snapshot;
+ snapshot_list = memorystatus_jetsam_snapshot->entries;
+ snapshot_max = memorystatus_jetsam_snapshot_max;
}
+ /*
+ * Init the snapshot header information
+ */
+ memorystatus_init_snapshot_vmstats(snapshot);
+ snapshot->snapshot_time = mach_absolute_time();
+ snapshot->notification_time = 0;
+ snapshot->js_gencount = 0;
+
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);
- if (FALSE == memorystatus_get_snapshot_properties_for_proc_locked(p, &memorystatus_jetsam_snapshot_list[i])) {
+ if (FALSE == memorystatus_init_jetsam_snapshot_entry_locked(p, &snapshot_list[i], snapshot->js_gencount)) {
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",
+ 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 == memorystatus_jetsam_snapshot_max) {
+ if (++i == snapshot_max) {
break;
}
}
- memorystatus_jetsam_snapshot->snapshot_time = mach_absolute_time();
- memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = i;
+ snapshot->entry_count = i;
+
+ if (!od_snapshot) {
+ /* update the system buffer count */
+ memorystatus_jetsam_snapshot_count = i;
+ }
}
#if DEVELOPMENT || DEBUG
return ret;
}
-#endif
-
/*
- * Jetsam a specific process.
+ * 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 boolean_t
-memorystatus_kill_specific_process(pid_t victim_pid, uint32_t cause) {
- boolean_t killed;
- proc_t p;
-
- /* TODO - add a victim queue and push this into the main jetsam thread */
-
- p = proc_find(victim_pid);
- if (!p) {
- return FALSE;
- }
+static int
+memorystatus_cmd_test_jetsam_sort(int priority, int sort_order) {
- printf("memorystatus: specifically killing pid %d [%s] - memorystatus_available_pages: %d\n",
- victim_pid, (p->p_comm ? p->p_comm : "(unknown)"), memorystatus_available_pages);
+ int error = 0;
- proc_list_lock();
+ unsigned int bucket_index = 0;
- if (memorystatus_jetsam_snapshot_count == 0) {
- memorystatus_jetsam_snapshot_procs_locked();
+ if (priority == -1) {
+ /* Use as shorthand for default priority */
+ bucket_index = JETSAM_PRIORITY_DEFAULT;
+ } else {
+ bucket_index = (unsigned int)priority;
}
- memorystatus_update_snapshot_locked(p, cause);
- proc_list_unlock();
-
- killed = memorystatus_do_kill(p, cause);
- proc_rele(p);
-
- return killed;
+ error = memorystatus_sort_bucket(bucket_index, sort_order);
+
+ return (error);
}
+#endif /* DEVELOPMENT || DEBUG */
+
/*
* Jetsam the first process in the queue.
*/
static boolean_t
-memorystatus_kill_top_process(boolean_t any, uint32_t cause, int32_t *priority, uint32_t *errors)
+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)
{
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;
+ uint32_t aPid_ep;
+ uint64_t killtime = 0;
+ clock_sec_t tv_sec;
+ clock_usec_t tv_usec;
+ uint32_t tv_msec;
#ifndef CONFIG_FREEZE
#pragma unused(any)
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_START,
memorystatus_available_pages, 0, 0, 0, 0);
+
+ if (sort_flag == TRUE) {
+ (void)memorystatus_sort_bucket(JETSAM_PRIORITY_FOREGROUND, JETSAM_SORT_DEFAULT);
+ }
+
proc_list_lock();
next_p = memorystatus_get_first_proc_locked(&i, TRUE);
#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;
+ continue; /* with lock held */
}
#if DEVELOPMENT || DEBUG
}
#endif /* 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 consumption.
+ * We attempt to safeguard that process e.g: do not jetsam it.
+ */
+
+ 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 | P_MEMSTAT_NORECLAIM));
} else
#endif
{
- if (priority) {
- *priority = p->p_memstat_effectivepriority;
- }
-
/*
* Capture a snapshot if none exists and:
* - 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) &&
- ((!priority) || (priority && (*priority != JETSAM_PRIORITY_IDLE)))) {
- memorystatus_jetsam_snapshot_procs_locked();
+ (memorystatus_idle_snapshot || ((!priority) || (priority && (aPid_ep != JETSAM_PRIORITY_IDLE))))) {
+ memorystatus_init_jetsam_snapshot_locked(NULL,0);
new_snapshot = TRUE;
}
* acquisition of the proc lock.
*/
p->p_memstat_state |= P_MEMSTAT_TERMINATED;
+
+ killtime = mach_absolute_time();
+ absolutetime_to_microtime(killtime, &tv_sec, &tv_usec);
+ tv_msec = tv_usec / 1000;
#if DEVELOPMENT || DEBUG
if ((memorystatus_jetsam_policy & kPolicyDiagnoseActive) && activeProcess) {
MEMORYSTATUS_DEBUG(1, "jetsam: suspending pid %d [%s] (active) for diagnosis - memory_status_level: %d\n",
- aPid, (p->p_comm ? p->p_comm: "(unknown)"), memorystatus_level);
- memorystatus_update_snapshot_locked(p, kMemorystatusKilledDiagnostic);
+ aPid, (*p->p_name ? p->p_name: "(unknown)"), memorystatus_level);
+ memorystatus_update_jetsam_snapshot_entry_locked(p, kMemorystatusKilledDiagnostic, killtime);
p->p_memstat_state |= P_MEMSTAT_DIAG_SUSPENDED;
if (memorystatus_jetsam_policy & kPolicyDiagnoseFirst) {
jetsam_diagnostic_suspended_one_active_proc = 1;
proc_list_unlock();
if (p) {
task_suspend(p->task);
+ if (priority) {
+ *priority = aPid_ep;
+ }
proc_rele(p);
killed = TRUE;
}
#endif /* DEVELOPMENT || DEBUG */
{
/* Shift queue, update stats */
- memorystatus_update_snapshot_locked(p, cause);
-
- p = proc_ref_locked(p);
- proc_list_unlock();
- if (p) {
- printf("memorystatus: jetsam killing pid %d [%s] - memorystatus_available_pages: %d\n",
- aPid, (p->p_comm ? p->p_comm : "(unknown)"), memorystatus_available_pages);
- killed = memorystatus_do_kill(p, cause);
- }
+ memorystatus_update_jetsam_snapshot_entry_locked(p, cause, killtime);
+
+ if (proc_ref_locked(p) == p) {
+ proc_list_unlock();
+ printf("%lu.%02d memorystatus: %s %d [%s] (%s %d) - memorystatus_available_pages: %d\n",
+ (unsigned long)tv_sec, tv_msec,
+ ((aPid_ep == JETSAM_PRIORITY_IDLE) ? "idle exiting pid" : "jetsam killing top process pid"),
+ aPid, (*p->p_name ? p->p_name : "(unknown)"),
+ jetsam_kill_cause_name[cause], aPid_ep, memorystatus_available_pages);
+
+ /*
+ * 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);
+
+ /* Success? */
+ if (killed) {
+ if (priority) {
+ *priority = aPid_ep;
+ }
+ proc_rele(p);
+ kill_count++;
+ goto exit;
+ }
- /* Success? */
- if (killed) {
- 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;
}
- /* Failure - unwind and restart. */
- proc_list_lock();
- proc_rele_locked(p);
- p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
- p->p_memstat_state |= P_MEMSTAT_ERROR;
- *errors += 1;
+ /*
+ * 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.
+ *
+ * And, we hold the the proc_list_lock at this point.
+ */
+
i = 0;
next_p = memorystatus_get_first_proc_locked(&i, TRUE);
}
proc_list_unlock();
exit:
+ os_reason_free(jetsam_reason);
+
/* Clear snapshot if freshly captured and no target was found */
if (new_snapshot && !killed) {
- memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
+ proc_list_lock();
+ memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
+ proc_list_unlock();
}
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_END,
- memorystatus_available_pages, killed ? aPid : 0, 0, 0, 0);
+ memorystatus_available_pages, killed ? aPid : 0, kill_count, 0, 0);
return killed;
}
-#if LEGACY_HIWATER
+/*
+ * Jetsam aggressively
+ */
+static boolean_t
+memorystatus_kill_top_process_aggressive(boolean_t any, uint32_t cause, os_reason_t jetsam_reason, int aggr_count,
+ int32_t priority_max, uint32_t *errors)
+{
+ 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;
+
+#pragma unused(any)
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_START,
+ memorystatus_available_pages, priority_max, 0, 0, 0);
+
+ memorystatus_sort_bucket(JETSAM_PRIORITY_FOREGROUND, JETSAM_SORT_DEFAULT);
+
+ proc_list_lock();
+
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ while (next_p) {
+#if DEVELOPMENT || DEBUG
+ int activeProcess;
+ int procSuspendedForDiagnosis;
+#endif /* DEVELOPMENT || DEBUG */
+
+ if ((unsigned int)(next_p->p_memstat_effectivepriority) != i) {
+
+ /*
+ * We have raced with next_p running on another core, as it has
+ * 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)
+ */
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus: aggressive%d: rewinding %s moved from band %d --> %d\n",
+ aggr_count, (*next_p->p_name ? next_p->p_name : "unknown"), i, next_p->p_memstat_effectivepriority);
+
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ continue;
+ }
+
+ p = next_p;
+ next_p = memorystatus_get_next_proc_locked(&i, p, TRUE);
+
+ 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;
+ }
+
+#if DEVELOPMENT || DEBUG
+ activeProcess = p->p_memstat_state & P_MEMSTAT_FOREGROUND;
+ 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;
+ }
+
+#if DEVELOPMENT || DEBUG
+ if ((memorystatus_jetsam_policy & kPolicyDiagnoseActive) && procSuspendedForDiagnosis) {
+ printf("jetsam: continuing after ignoring proc suspended already for diagnosis - %d\n", aPid);
+ continue;
+ }
+#endif /* DEVELOPMENT || DEBUG */
+
+ /*
+ * Capture a snapshot if none exists.
+ */
+ if (memorystatus_jetsam_snapshot_count == 0) {
+ memorystatus_init_jetsam_snapshot_locked(NULL,0);
+ new_snapshot = TRUE;
+ }
+
+ /*
+ * 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;
+
+ 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);
+
+ /*
+ * 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;
+
+ /*
+ * 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.%01d memorystatus: aggressive%d: %s %d [%s] (%s %d) - memorystatus_available_pages: %d\n",
+ (unsigned long)tv_sec, tv_msec, aggr_count,
+ ((aPid_ep == JETSAM_PRIORITY_IDLE) ? "idle exiting pid" : "jetsam killing pid"),
+ aPid, (*p->p_name ? p->p_name : "(unknown)"),
+ jetsam_kill_cause_name[cause], aPid_ep, memorystatus_available_pages);
+
+ memorystatus_level_snapshot = memorystatus_level;
+
+ /*
+ * 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);
+
+ /* Success? */
+ if (killed) {
+ proc_rele(p);
+ kill_count++;
+ p = NULL;
+ killed = FALSE;
+
+ /*
+ * Continue the killing spree.
+ */
+ proc_list_lock();
+ if (next_p) {
+ proc_rele_locked(next_p);
+ }
+
+ 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;
+ }
+ }
+
+ continue;
+ }
+
+ /*
+ * 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;
+ }
+
+ /*
+ * 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.
+ */
+
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ }
+
+ proc_list_unlock();
+
+exit:
+ os_reason_free(jetsam_reason);
+
+ /* Clear snapshot if freshly captured and no target was found */
+ if (new_snapshot && (kill_count == 0)) {
+ memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
+ }
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_END,
+ memorystatus_available_pages, killed ? aPid : 0, kill_count, 0, 0);
+
+ if (kill_count > 0) {
+ return(TRUE);
+ }
+ else {
+ return(FALSE);
+ }
+}
static boolean_t
memorystatus_kill_hiwat_proc(uint32_t *errors)
pid_t aPid = 0;
proc_t p = PROC_NULL, next_p = PROC_NULL;
boolean_t new_snapshot = FALSE, killed = FALSE;
+ int kill_count = 0;
unsigned int i = 0;
-
+ uint32_t aPid_ep;
+ 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;
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM_HIWAT) | DBG_FUNC_START,
memorystatus_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");
+ }
+
proc_list_lock();
next_p = memorystatus_get_first_proc_locked(&i, TRUE);
while (next_p) {
- uint32_t footprint;
- boolean_t skip;
+ uint64_t footprint_in_bytes = 0;
+ uint64_t memlimit_in_bytes = 0;
+ boolean_t skip = 0;
p = next_p;
next_p = memorystatus_get_next_proc_locked(&i, p, TRUE);
aPid = p->p_pid;
+ aPid_ep = p->p_memstat_effectivepriority;
if (p->p_memstat_state & (P_MEMSTAT_ERROR | P_MEMSTAT_TERMINATED)) {
continue;
if (p->p_memstat_memlimit <= 0) {
continue;
}
-
+
+#if 0
+ /*
+ * No need to consider P_MEMSTAT_MEMLIMIT_BACKGROUND anymore.
+ * Background limits are described via the inactive limit slots.
+ * Their fatal/non-fatal setting will drive whether or not to be
+ * considered in this kill path.
+ */
+
/* skip if a currently inapplicable limit is encountered */
if ((p->p_memstat_state & P_MEMSTAT_MEMLIMIT_BACKGROUND) && (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND)) {
continue;
}
+#endif
+ 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);
- footprint = (uint32_t)(get_task_phys_footprint(p->task) / (1024 * 1024));
- skip = (((int32_t)footprint) <= p->p_memstat_memlimit);
#if DEVELOPMENT || DEBUG
if (!skip && (memorystatus_jetsam_policy & kPolicyDiagnoseActive)) {
if (p->p_memstat_state & P_MEMSTAT_DIAG_SUSPENDED) {
if (skip) {
continue;
} else {
- MEMORYSTATUS_DEBUG(1, "jetsam: %s pid %d [%s] - %d pages > 1 (%d)\n",
- (memorystatus_jetsam_policy & kPolicyDiagnoseActive) ? "suspending": "killing", aPid, p->p_comm, pages, hiwat);
+#if 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 /* DEVELOPMENT || DEBUG */
if (memorystatus_jetsam_snapshot_count == 0) {
- memorystatus_jetsam_snapshot_procs_locked();
+ memorystatus_init_jetsam_snapshot_locked(NULL,0);
new_snapshot = TRUE;
}
p->p_memstat_state |= P_MEMSTAT_TERMINATED;
+
+ killtime = mach_absolute_time();
+ absolutetime_to_microtime(killtime, &tv_sec, &tv_usec);
+ tv_msec = tv_usec / 1000;
#if DEVELOPMENT || DEBUG
if (memorystatus_jetsam_policy & kPolicyDiagnoseActive) {
MEMORYSTATUS_DEBUG(1, "jetsam: pid %d suspended for diagnosis - memorystatus_available_pages: %d\n", aPid, memorystatus_available_pages);
- memorystatus_update_snapshot_locked(p, kMemorystatusKilledDiagnostic);
+ memorystatus_update_jetsam_snapshot_entry_locked(p, kMemorystatusKilledDiagnostic, killtime);
p->p_memstat_state |= P_MEMSTAT_DIAG_SUSPENDED;
p = proc_ref_locked(p);
} else
#endif /* DEVELOPMENT || DEBUG */
{
- memorystatus_update_snapshot_locked(p, kMemorystatusKilledHiwat);
+ memorystatus_update_jetsam_snapshot_entry_locked(p, kMemorystatusKilledHiwat, killtime);
- p = proc_ref_locked(p);
- proc_list_unlock();
- if (p) {
- printf("memorystatus: jetsam killing pid %d [%s] (highwater) - memorystatus_available_pages: %d\n",
- aPid, (p->p_comm ? p->p_comm : "(unknown)"), memorystatus_available_pages);
- killed = memorystatus_do_kill(p, kMemorystatusKilledHiwat);
- }
-
- /* Success? */
- if (killed) {
- proc_rele(p);
- goto exit;
+ if (proc_ref_locked(p) == p) {
+ proc_list_unlock();
+
+ printf("%lu.%02d memorystatus: jetsam killing pid %d [%s] (highwater %d) - memorystatus_available_pages: %d\n",
+ (unsigned long)tv_sec, tv_msec, aPid, (*p->p_name ? p->p_name : "(unknown)"), aPid_ep, memorystatus_available_pages);
+
+ /*
+ * 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, kMemorystatusKilledHiwat, jetsam_reason);
+
+ /* Success? */
+ if (killed) {
+ proc_rele(p);
+ kill_count++;
+ 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;
}
- /* Failure - unwind and restart. */
- proc_list_lock();
- proc_rele_locked(p);
- p->p_memstat_state &= ~P_MEMSTAT_TERMINATED;
- p->p_memstat_state |= P_MEMSTAT_ERROR;
- *errors += 1;
+ /*
+ * 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.
+ *
+ * And, we hold the the proc_list_lock at this point.
+ */
+
i = 0;
next_p = memorystatus_get_first_proc_locked(&i, TRUE);
}
proc_list_unlock();
exit:
+ os_reason_free(jetsam_reason);
+
/* 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();
}
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM_HIWAT) | DBG_FUNC_END,
- memorystatus_available_pages, killed ? aPid : 0, 0, 0, 0);
+ memorystatus_available_pages, killed ? aPid : 0, kill_count, 0, 0);
return killed;
}
-#endif /* LEGACY_HIWATER */
+/*
+ * Jetsam a process pinned in the elevated band.
+ *
+ * Return: true -- at least one pinned process was jetsammed
+ * false -- no pinned process was jetsammed
+ */
+static boolean_t
+memorystatus_kill_elevated_process(uint32_t cause, os_reason_t jetsam_reason, int aggr_count, uint32_t *errors)
+{
+ pid_t aPid = 0;
+ proc_t p = PROC_NULL, next_p = PROC_NULL;
+ boolean_t new_snapshot = FALSE, killed = FALSE;
+ int kill_count = 0;
+ unsigned int i = JETSAM_PRIORITY_ELEVATED_INACTIVE;
+ 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);
+
+ proc_list_lock();
+
+ next_p = memorystatus_get_first_proc_locked(&i, FALSE);
+ while (next_p) {
+
+ p = next_p;
+ next_p = memorystatus_get_next_proc_locked(&i, p, FALSE);
+
+ aPid = p->p_pid;
+ aPid_ep = p->p_memstat_effectivepriority;
+
+ /*
+ * Only pick a process pinned in this elevated band
+ */
+ if (!(p->p_memstat_state & P_MEMSTAT_USE_ELEVATED_INACTIVE_BAND)) {
+ continue;
+ }
+
+ if (p->p_memstat_state & (P_MEMSTAT_ERROR | P_MEMSTAT_TERMINATED)) {
+ continue;
+ }
+
+#if CONFIG_FREEZE
+ if (p->p_memstat_state & P_MEMSTAT_LOCKED) {
+ continue;
+ }
+#endif
+
+#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 */
+
+ if (memorystatus_jetsam_snapshot_count == 0) {
+ memorystatus_init_jetsam_snapshot_locked(NULL,0);
+ new_snapshot = TRUE;
+ }
+
+ p->p_memstat_state |= P_MEMSTAT_TERMINATED;
+
+ 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);
+
+ if (proc_ref_locked(p) == p) {
+
+ proc_list_unlock();
+
+ printf("%lu.%01d memorystatus: elevated%d: jetsam killing pid %d [%s] (%s %d) - memorystatus_available_pages: %d\n",
+ (unsigned long)tv_sec, tv_msec,
+ aggr_count,
+ aPid, (*p->p_name ? p->p_name : "(unknown)"),
+ jetsam_kill_cause_name[cause], aPid_ep, memorystatus_available_pages);
+
+ /*
+ * 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);
+
+ /* Success? */
+ if (killed) {
+ proc_rele(p);
+ kill_count++;
+ 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;
+ }
+
+ /*
+ * 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.
+ */
+
+ next_p = memorystatus_get_first_proc_locked(&i, FALSE);
+ }
+
+ proc_list_unlock();
+
+exit:
+ os_reason_free(jetsam_reason);
+
+ /* 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();
+ }
+
+ 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);
+}
static boolean_t
memorystatus_kill_process_async(pid_t victim_pid, uint32_t cause) {
- /* TODO: allow a general async path */
- if ((victim_pid != -1) || (cause != kMemorystatusKilledVMPageShortage || cause != kMemorystatusKilledVMThrashing)) {
+ /*
+ * 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 != kMemorystatusKilledVMThrashing &&
+ cause != kMemorystatusKilledFCThrashing)) {
return FALSE;
}
- kill_under_pressure = TRUE;
+ kill_under_pressure_cause = cause;
memorystatus_thread_wake();
return TRUE;
}
-static boolean_t
-memorystatus_kill_process_sync(pid_t victim_pid, uint32_t cause) {
- boolean_t res;
- uint32_t errors = 0;
-
- if (victim_pid == -1) {
- /* No pid, so kill first process */
- res = memorystatus_kill_top_process(TRUE, cause, NULL, &errors);
- } else {
- res = memorystatus_kill_specific_process(victim_pid, cause);
- }
-
- if (errors) {
- memorystatus_clear_errors();
- }
-
- if (res == TRUE) {
- /* Fire off snapshot notification */
- size_t snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) +
- sizeof(memorystatus_jetsam_snapshot_entry_t) * memorystatus_jetsam_snapshot_count;
- memorystatus_jetsam_snapshot->notification_time = mach_absolute_time();
- memorystatus_send_note(kMemorystatusSnapshotNote, &snapshot_size, sizeof(snapshot_size));
- }
-
- return res;
-}
-
boolean_t
memorystatus_kill_on_VM_page_shortage(boolean_t async) {
if (async) {
return memorystatus_kill_process_async(-1, kMemorystatusKilledVMPageShortage);
} else {
- return memorystatus_kill_process_sync(-1, kMemorystatusKilledVMPageShortage);
+ 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");
+ }
+
+ return memorystatus_kill_process_sync(-1, kMemorystatusKilledVMPageShortage, jetsam_reason);
}
}
if (async) {
return memorystatus_kill_process_async(-1, kMemorystatusKilledVMThrashing);
} else {
- return memorystatus_kill_process_sync(-1, kMemorystatusKilledVMThrashing);
+ os_reason_t jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_MEMORY_VMTHRASHING);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("memorystatus_kill_on_VM_thrashing -- sync: failed to allocate jetsam reason\n");
+ }
+
+ return memorystatus_kill_process_sync(-1, kMemorystatusKilledVMThrashing, jetsam_reason);
+ }
+}
+
+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);
}
}
boolean_t
memorystatus_kill_on_vnode_limit(void) {
- return memorystatus_kill_process_sync(-1, kMemorystatusKilledVnodes);
+ 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 memorystatus_kill_process_sync(-1, kMemorystatusKilledVnodes, jetsam_reason);
}
#endif /* CONFIG_JETSAM */
{
kern_return_t result;
thread_t thread;
+
+ freezer_lck_grp_attr = lck_grp_attr_alloc_init();
+ freezer_lck_grp = lck_grp_alloc_init("freezer", freezer_lck_grp_attr);
+
+ lck_mtx_init(&freezer_mutex, freezer_lck_grp, NULL);
result = kernel_thread_start(memorystatus_freeze_thread, NULL, &thread);
if (result == KERN_SUCCESS) {
}
}
+/*
+ * Synchronously freeze the passed proc. Called with a reference to the proc held.
+ *
+ * Returns EINVAL or the value returned by task_freeze().
+ */
+int
+memorystatus_freeze_process_sync(proc_t p)
+{
+ int ret = EINVAL;
+ pid_t aPid = 0;
+ boolean_t memorystatus_freeze_swap_low = FALSE;
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_FREEZE) | DBG_FUNC_START,
+ memorystatus_available_pages, 0, 0, 0, 0);
+
+ lck_mtx_lock(&freezer_mutex);
+
+ if (p == NULL) {
+ goto exit;
+ }
+
+ if (memorystatus_freeze_enabled == FALSE) {
+ goto exit;
+ }
+
+ if (!memorystatus_can_freeze(&memorystatus_freeze_swap_low)) {
+ goto exit;
+ }
+
+ if (memorystatus_freeze_update_throttle()) {
+ printf("memorystatus_freeze_process_sync: in throttle, ignorning freeze\n");
+ memorystatus_freeze_throttle_count++;
+ goto exit;
+ }
+
+ proc_list_lock();
+
+ if (p != NULL) {
+ uint32_t purgeable, wired, clean, dirty, state;
+ uint32_t max_pages, pages, i;
+ boolean_t shared;
+
+ aPid = p->p_pid;
+ state = p->p_memstat_state;
+
+ /* Ensure the process is eligible for freezing */
+ if ((state & (P_MEMSTAT_TERMINATED | P_MEMSTAT_LOCKED | P_MEMSTAT_FROZEN)) || !(state & P_MEMSTAT_SUSPENDED)) {
+ proc_list_unlock();
+ goto exit;
+ }
+
+ /* Only freeze processes meeting our minimum resident page criteria */
+ memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL, NULL);
+ if (pages < memorystatus_freeze_pages_min) {
+ proc_list_unlock();
+ goto exit;
+ }
+
+ if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
+
+ unsigned int avail_swap_space = 0; /* in pages. */
+
+ /*
+ * Freezer backed by the compressor and swap file(s)
+ * while will hold compressed data.
+ */
+ avail_swap_space = vm_swap_get_free_space() / PAGE_SIZE_64;
+
+ max_pages = MIN(avail_swap_space, memorystatus_freeze_pages_max);
+
+ if (max_pages < memorystatus_freeze_pages_min) {
+ proc_list_unlock();
+ goto exit;
+ }
+ } 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();
+
+ ret = task_freeze(p->task, &purgeable, &wired, &clean, &dirty, max_pages, &shared, FALSE);
+
+ 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);
+
+ proc_list_lock();
+ p->p_memstat_state &= ~P_MEMSTAT_LOCKED;
+
+ if (ret == KERN_SUCCESS) {
+ memorystatus_freeze_entry_t data = { aPid, TRUE, dirty };
+
+ memorystatus_frozen_count++;
+
+ p->p_memstat_state |= (P_MEMSTAT_FROZEN | (shared ? 0: P_MEMSTAT_NORECLAIM));
+
+ if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
+ /* Update stats */
+ for (i = 0; i < sizeof(throttle_intervals) / sizeof(struct throttle_interval_t); i++) {
+ throttle_intervals[i].pageouts += dirty;
+ }
+ }
+
+ memorystatus_freeze_pageouts += dirty;
+ memorystatus_freeze_count++;
+
+ proc_list_unlock();
+
+ memorystatus_send_note(kMemorystatusFreezeNote, &data, sizeof(data));
+ } else {
+ proc_list_unlock();
+ }
+ }
+
+exit:
+ lck_mtx_unlock(&freezer_mutex);
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_FREEZE) | DBG_FUNC_END,
+ memorystatus_available_pages, aPid, 0, 0, 0);
+
+ return ret;
+}
+
static int
memorystatus_freeze_top_process(boolean_t *memorystatus_freeze_swap_low)
{
}
/* Only freeze processes meeting our minimum resident page criteria */
- memorystatus_get_task_page_counts(p->task, &pages, NULL);
+ memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL, NULL);
if (pages < memorystatus_freeze_pages_min) {
continue; // with lock held
}
- if (DEFAULT_FREEZER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) {
- /* Ensure there's enough free space to freeze this process. */
- max_pages = MIN(default_pager_swap_pages_free(), memorystatus_freeze_pages_max);
+ if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
+
+ /* Ensure there's enough free space to freeze this process. */
+
+ unsigned int avail_swap_space = 0; /* in pages. */
+
+ /*
+ * Freezer backed by the compressor and swap file(s)
+ * while will hold compressed data.
+ */
+ avail_swap_space = vm_swap_get_free_space() / PAGE_SIZE_64;
+
+ max_pages = MIN(avail_swap_space, memorystatus_freeze_pages_max);
+
if (max_pages < memorystatus_freeze_pages_min) {
*memorystatus_freeze_swap_low = TRUE;
proc_list_unlock();
goto exit;
}
} else {
+ /*
+ * We only have the compressor pool.
+ */
max_pages = UINT32_MAX - 1;
}
kr = task_freeze(p->task, &purgeable, &wired, &clean, &dirty, max_pages, &shared, FALSE);
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, shared %d, free swap: %d\n",
- (kr == KERN_SUCCESS) ? "SUCCEEDED" : "FAILED", aPid, (p->p_comm ? p->p_comm : "(unknown)"),
- memorystatus_available_pages, purgeable, wired, clean, dirty, shared, default_pager_swap_pages_free());
+ "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);
proc_list_lock();
p->p_memstat_state &= ~P_MEMSTAT_LOCKED;
memorystatus_frozen_count++;
p->p_memstat_state |= (P_MEMSTAT_FROZEN | (shared ? 0: P_MEMSTAT_NORECLAIM));
-
- /* Update stats */
- for (i = 0; i < sizeof(throttle_intervals) / sizeof(struct throttle_interval_t); i++) {
- throttle_intervals[i].pageouts += dirty;
+
+ if (VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
+ /* Update stats */
+ for (i = 0; i < sizeof(throttle_intervals) / sizeof(struct throttle_interval_t); i++) {
+ throttle_intervals[i].pageouts += dirty;
+ }
}
-
+
memorystatus_freeze_pageouts += dirty;
memorystatus_freeze_count++;
memorystatus_send_note(kMemorystatusFreezeNote, &data, sizeof(data));
- /* Return the number of reclaimed pages */
- ret = dirty;
+ /* Return KERN_SUCESS */
+ ret = kr;
} else {
proc_list_unlock();
static boolean_t
memorystatus_can_freeze(boolean_t *memorystatus_freeze_swap_low)
{
+ boolean_t can_freeze = TRUE;
+
/* 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) {
if (!memorystatus_can_freeze_processes()) {
return FALSE;
}
+ assert(VM_CONFIG_COMPRESSOR_IS_PRESENT);
- /* Is swap running low? */
- if (*memorystatus_freeze_swap_low) {
- /* If there's been no movement in free swap pages since we last attempted freeze, return. */
- if (default_pager_swap_pages_free() < memorystatus_freeze_pages_min) {
- return FALSE;
+ if ( !VM_CONFIG_FREEZER_SWAP_IS_ACTIVE) {
+ /*
+ * In-core compressor used for freezing WITHOUT on-disk swap support.
+ */
+ 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;
}
-
- /* Pages have been freed - we can retry. */
- *memorystatus_freeze_swap_low = FALSE;
+ } else {
+ /*
+ * Freezing WITH on-disk swap support.
+ *
+ * In-core compressor fronts the swap.
+ */
+ if (vm_swap_low_on_space()) {
+ if (*memorystatus_freeze_swap_low) {
+ *memorystatus_freeze_swap_low = TRUE;
+ }
+
+ can_freeze = FALSE;
+ }
+
}
- /* OK */
- return TRUE;
+ return can_freeze;
}
static void
memorystatus_freeze_update_throttle_interval(mach_timespec_t *ts, struct throttle_interval_t *interval)
{
+ unsigned int freeze_daily_pageouts_max = memorystatus_freeze_daily_mb_max * (1024 * 1024 / PAGE_SIZE);
if (CMP_MACH_TIMESPEC(ts, &interval->ts) >= 0) {
if (!interval->max_pageouts) {
- interval->max_pageouts = (interval->burst_multiple * (((uint64_t)interval->mins * FREEZE_DAILY_PAGEOUTS_MAX) / (24 * 60)));
+ interval->max_pageouts = (interval->burst_multiple * (((uint64_t)interval->mins * freeze_daily_pageouts_max) / (24 * 60)));
} else {
printf("memorystatus_freeze_update_throttle_interval: %d minute throttle timeout, resetting\n", interval->mins);
}
memorystatus_freeze_thread(void *param __unused, wait_result_t wr __unused)
{
static boolean_t memorystatus_freeze_swap_low = FALSE;
-
+
+ lck_mtx_lock(&freezer_mutex);
if (memorystatus_freeze_enabled) {
if (memorystatus_can_freeze(&memorystatus_freeze_swap_low)) {
- /* Only freeze if we've not exceeded our pageout budgets */
+ /* Only freeze if we've not exceeded our pageout budgets.*/
if (!memorystatus_freeze_update_throttle()) {
memorystatus_freeze_top_process(&memorystatus_freeze_swap_low);
} else {
}
}
}
+ lck_mtx_unlock(&freezer_mutex);
assert_wait((event_t) &memorystatus_freeze_wakeup, THREAD_UNINT);
thread_block((thread_continue_t) memorystatus_freeze_thread);
}
-#endif /* CONFIG_FREEZE */
+static int
+sysctl_memorystatus_do_fastwake_warmup_all SYSCTL_HANDLER_ARGS
+{
+#pragma unused(oidp, req, arg1, arg2)
-#if CONFIG_JETSAM && VM_PRESSURE_EVENTS
+ /* Need to be root or have entitlement */
+ if (!kauth_cred_issuser(kauth_cred_get()) && !IOTaskHasEntitlement(current_task(), MEMORYSTATUS_ENTITLEMENT)) {
+ return EPERM;
+ }
-boolean_t
-memorystatus_warn_process(pid_t pid) {
- return (vm_dispatch_pressure_note_to_pid(pid, FALSE) == 0);
+ if (memorystatus_freeze_enabled == FALSE) {
+ return ENOTSUP;
+ }
+
+ do_fastwake_warmup_all();
+
+ return 0;
}
-static inline boolean_t
-memorystatus_update_pressure_locked(boolean_t *pressured) {
- vm_pressure_level_t old_level, new_level;
-
- old_level = memorystatus_vm_pressure_level;
-
- if (memorystatus_available_pages > memorystatus_available_pages_pressure) {
- /* Too many free pages */
- new_level = kVMPressureNormal;
- }
-#if CONFIG_FREEZE
- else if (memorystatus_frozen_count > 0) {
- /* Frozen processes exist */
- new_level = kVMPressureNormal;
- }
-#endif
- else if (memorystatus_suspended_count > MEMORYSTATUS_SUSPENDED_THRESHOLD) {
- /* Too many supended processes */
- new_level = kVMPressureNormal;
- }
- else if (memorystatus_suspended_count > 0) {
- /* Some suspended processes - warn */
- new_level = kVMPressureWarning;
- }
- else {
- /* Otherwise, pressure level is urgent */
- new_level = kVMPressureUrgent;
- }
-
- *pressured = (new_level != kVMPressureNormal);
-
- /* Did the pressure level change? */
- if (old_level != new_level) {
- MEMORYSTATUS_DEBUG(1, "memorystatus_update_pressure_locked(): memory pressure changed %d -> %d; memorystatus_available_pages: %d\n ",
- old_level, new_level, memorystatus_available_pages);
- memorystatus_vm_pressure_level = new_level;
- return TRUE;
+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;
+
+ ev_msg.dv[0].data_length = data_length;
+ ev_msg.dv[0].data_ptr = data;
+ ev_msg.dv[1].data_length = 0;
+
+ ret = kev_post_msg(&ev_msg);
+ if (ret) {
+ printf("%s: kev_post_msg() failed, err %d\n", __func__, ret);
}
- return FALSE;
+ return ret;
}
-kern_return_t
-memorystatus_update_vm_pressure(boolean_t target_foreground) {
- boolean_t pressure_changed, pressured;
- boolean_t warn = FALSE;
+boolean_t
+memorystatus_warn_process(pid_t pid, boolean_t limit_exceeded) {
- /*
- * Centralised pressure handling routine. Called from:
- * - The main jetsam thread. In this case, we update the pressure level and dispatch warnings to the foreground
- * process *only*, each time the available page % drops.
- * - The pageout scan path. In this scenario, every other registered process is targeted in footprint order.
- *
- * This scheme guarantees delivery to the foreground app, while providing for warnings to the remaining processes
- * driven by the pageout scan.
+ boolean_t ret = FALSE;
+ boolean_t found_knote = FALSE;
+ struct knote *kn = NULL;
+
+ /*
+ * See comment in sysctl_memorystatus_vm_pressure_send.
*/
- MEMORYSTATUS_DEBUG(1, "memorystatus_update_vm_pressure(): foreground %d; available %d, critical %d, pressure %d\n",
- target_foreground, memorystatus_available_pages, memorystatus_available_pages_critical, memorystatus_available_pages_pressure);
+ memorystatus_klist_lock();
- proc_list_lock();
+ 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;
- pressure_changed = memorystatus_update_pressure_locked(&pressured);
-
- if (pressured) {
- if (target_foreground) {
- if (memorystatus_available_pages != memorystatus_last_foreground_pressure_pages) {
- if (memorystatus_available_pages < memorystatus_last_foreground_pressure_pages) {
- warn = TRUE;
+ if (knote_pid == pid) {
+ /*
+ * 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 (!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 (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN) {
+ kn->kn_fflags = NOTE_MEMORYSTATUS_PROC_LIMIT_WARN;
+ found_knote = TRUE;
+ }
+
+ } else {
+ /*
+ * Send this notification when a process has exceeded a soft limit.
+ */
+ if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL) {
+ kn->kn_fflags = NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL;
+ found_knote = TRUE;
}
- memorystatus_last_foreground_pressure_pages = memorystatus_available_pages;
}
- } else {
- warn = TRUE;
}
- } else if (pressure_changed) {
- memorystatus_last_foreground_pressure_pages = (unsigned int)-1;
}
-
- proc_list_unlock();
- /* Target foreground processes if specified */
- if (warn) {
- if (target_foreground) {
- MEMORYSTATUS_DEBUG(1, "memorystatus_update_vm_pressure(): invoking vm_find_pressure_foreground_candidates()\n");
- vm_find_pressure_foreground_candidates();
- } else {
- MEMORYSTATUS_DEBUG(1, "memorystatus_update_vm_pressure(): invoking vm_find_pressure_candidate()\n");
- /* Defer to VM code. This can race with the foreground priority, but
- * it's preferable to holding onto locks for an extended period. */
- vm_find_pressure_candidate();
- }
+ if (found_knote) {
+ KNOTE(&memorystatus_klist, 0);
+ ret = TRUE;
}
-
- /* Dispatch the global kevent to privileged listeners */
- if (pressure_changed) {
- memorystatus_issue_pressure_kevent(pressured);
+
+ 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;
}
- return KERN_SUCCESS;
+ return (task_low_mem_privileged_listener(current_task(), set_privilege, NULL));
}
int
return memorystatus_send_note(kMemorystatusPressureNote, &pid, sizeof(pid));
}
+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;
+ }
+ }
+
+ memorystatus_klist_unlock();
+}
+
boolean_t
memorystatus_bg_pressure_eligible(proc_t p) {
boolean_t eligible = FALSE;
(p->p_memstat_effectivepriority == JETSAM_PRIORITY_FOREGROUND_SUPPORT));
}
-#else /* CONFIG_JETSAM && VM_PRESSURE_EVENTS */
+/*
+ * This is meant for stackshot and kperf -- it does not take the proc_list_lock
+ * to access the p_memstat_dirty field.
+ */
+boolean_t
+memorystatus_proc_is_dirty_unsafe(void *v)
+{
+ if (!v) {
+ return FALSE;
+ }
+ proc_t p = (proc_t)v;
+ return (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) != 0;
+}
+
+#endif /* CONFIG_MEMORYSTATUS */
/*
* Trigger levels to test the mechanism.
vm_pressure_level_t memorystatus_manual_testing_level = kVMPressureNormal;
extern struct knote *
-vm_pressure_select_optimal_candidate_to_notify(struct klist *, int);
+vm_pressure_select_optimal_candidate_to_notify(struct klist *, int, boolean_t);
-extern
-kern_return_t vm_pressure_notification_without_levels(void);
-
-extern void vm_pressure_klist_lock(void);
-extern void vm_pressure_klist_unlock(void);
+/*
+ * This value is the threshold that a process must meet to be considered for scavenging.
+ */
+#define VM_PRESSURE_MINIMUM_RSIZE 10 /* MB */
-extern void vm_reset_active_list(void);
+#define VM_PRESSURE_NOTIFY_WAIT_PERIOD 10000 /* milliseconds */
-extern void delay(int);
+#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
#define INTER_NOTIFICATION_DELAY (250000) /* .25 second */
* pressure_level_to_set - the task is about to be notified of this new level. Update the task's bit notification information appropriately.
*
*/
+
boolean_t
-is_knote_registered_modify_task_pressure_bits(struct knote*, int, task_t, vm_pressure_level_t, vm_pressure_level_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);
+ }
+
+ task_mark_has_been_notified(task, pressure_level_to_set);
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+void
+memorystatus_klist_reset_all_for_level(vm_pressure_level_t pressure_level_to_clear)
+{
+ struct knote *kn = NULL;
+
+ memorystatus_klist_lock();
+ SLIST_FOREACH(kn, &memorystatus_klist, kn_selnext) {
+
+ proc_t p = PROC_NULL;
+ struct task* t = TASK_NULL;
+
+ 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();
+
+ t = (struct task *)(p->task);
+
+ task_clear_has_been_notified(t, pressure_level_to_clear);
+
+ proc_rele(p);
+ }
+
+ memorystatus_klist_unlock();
+}
+
+extern kern_return_t vm_pressure_notify_dispatch_vm_clients(boolean_t target_foreground_process);
+
+struct knote *
+vm_pressure_select_optimal_candidate_to_notify(struct klist *candidate_list, int level, boolean_t target_foreground_process);
+
+/*
+ * 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);
+
+void consider_vm_pressure_events(void)
+{
+ vm_dispatch_memory_pressure();
+}
+static void vm_dispatch_memory_pressure(void)
+{
+ memorystatus_update_vm_pressure(FALSE);
+}
+
+extern vm_pressure_level_t
+convert_internal_pressure_level_to_dispatch_level(vm_pressure_level_t);
+
+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;
+
+ if (pressure_snapshot == -1) {
+ /*
+ * Initial snapshot.
+ */
+ pressure_snapshot = level;
+ pressure_increase = TRUE;
+ } else {
+
+ if (level >= pressure_snapshot) {
+ pressure_increase = TRUE;
+ } else {
+ pressure_increase = FALSE;
+ }
+
+ 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.
+ */
+ selected_task_importance = 0;
+ }
+
+ microuptime(&curr_tstamp);
+
+ 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;
+
+ 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();
+
+#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 */
+
+ t = (struct task *)(p->task);
+
+ timevalsub(&curr_tstamp, &p->vm_pressure_last_notify_tstamp);
+ elapsed_msecs = curr_tstamp.tv_sec * 1000 + curr_tstamp.tv_usec / 1000;
+
+ vm_pressure_level_t dispatch_level = convert_internal_pressure_level_to_dispatch_level(level);
+
+ if ((kn->kn_sfflags & dispatch_level) == 0) {
+ proc_rele(p);
+ 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);
+ continue;
+ }
+#endif /* CONFIG_MEMORYSTATUS */
+
+ curr_task_importance = task_importance_estimate(t);
+
+ /*
+ * 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;
+ }
+ }
+ } 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;
+ }
+ }
+
+ /*
+ * 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 (resident_size >= VM_PRESSURE_MINIMUM_RSIZE) {
+
+ if (level > 0) {
+ /*
+ * Warning or Critical Pressure.
+ */
+ 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))) {
-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) {
+ /*
+ * 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
+ */
- if (task_has_been_notified(task, pressure_level_to_clear) == TRUE) {
+ consider_knote = TRUE;
+ }
+ }
+ } else if (level == 0) {
+ /*
+ * Pressure back to normal.
+ */
+ if ((curr_task_importance > selected_task_importance) ||
+ ((curr_task_importance == selected_task_importance) && (resident_size > resident_max))) {
- task_clear_has_been_notified(task, pressure_level_to_clear);
- }
+ consider_knote = TRUE;
+ }
+ }
- task_mark_has_been_notified(task, pressure_level_to_set);
- return 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 */
+ }
+ } 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 FALSE;
+ return kn_max;
}
-extern kern_return_t vm_pressure_notify_dispatch_vm_clients(void);
+#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_best_process)
+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;
- static vm_pressure_level_t level_snapshot = kVMPressureNormal;
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 */
+
+ 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++;
+
+ if (memorystatus_manual_testing_on == TRUE) {
+ /*
+ * Skip the delay when testing
+ * the pressure notification scheme.
+ */
+ } else {
+ delay(1000000); /* 1 second */
+ }
+ }
+#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.
+ */
+
+ level_snapshot = memorystatus_vm_pressure_level;
+
+ if (level_snapshot == kVMPressureWarning || level_snapshot == kVMPressureUrgent) {
+
+ if (curr_ts < next_warning_notification_sent_at_ts) {
+ delay(INTER_NOTIFICATION_DELAY * 4 /* 1 sec */);
+ return KERN_SUCCESS;
+ }
+ } else if (level_snapshot == kVMPressureCritical) {
+
+ if (curr_ts < next_critical_notification_sent_at_ts) {
+ delay(INTER_NOTIFICATION_DELAY * 4 /* 1 sec */);
+ return KERN_SUCCESS;
+ }
+ }
+ }
+
while (1) {
/*
*/
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;
+ }
+ }
+
+ prev_level_snapshot = level_snapshot;
+ smoothing_window_started = FALSE;
+
memorystatus_klist_lock();
- kn_max = vm_pressure_select_optimal_candidate_to_notify(&memorystatus_klist, level_snapshot);
+ kn_max = vm_pressure_select_optimal_candidate_to_notify(&memorystatus_klist, level_snapshot, target_foreground_process);
if (kn_max == NULL) {
memorystatus_klist_unlock();
/*
* No more level-based clients to notify.
- * Try the non-level based notification clients.
- *
- * However, these non-level clients don't understand
- * the "return-to-normal" notification.
- *
- * So don't consider them for those notifications. Just
- * return instead.
*
+ * Start the 'resting' window within which clients will not be re-notified.
*/
if (level_snapshot != kVMPressureNormal) {
- goto try_dispatch_vm_clients;
- } else {
- return KERN_FAILURE;
- }
+ if (level_snapshot == kVMPressureWarning || level_snapshot == kVMPressureUrgent) {
+ nanoseconds_to_absolutetime(WARNING_NOTIFICATION_RESTING_PERIOD * NSEC_PER_SEC, &curr_ts);
+ next_warning_notification_sent_at_ts = mach_absolute_time() + curr_ts;
+
+ memorystatus_klist_reset_all_for_level(kVMPressureWarning);
+ }
+
+ if (level_snapshot == kVMPressureCritical) {
+ nanoseconds_to_absolutetime(CRITICAL_NOTIFICATION_RESTING_PERIOD * NSEC_PER_SEC, &curr_ts);
+ next_critical_notification_sent_at_ts = mach_absolute_time() + curr_ts;
+
+ memorystatus_klist_reset_all_for_level(kVMPressureCritical);
+ }
+ }
+ return KERN_FAILURE;
}
- target_proc = kn_max->kn_kq->kq_p;
+ target_proc = knote_get_kq(kn_max)->kq_p;
proc_list_lock();
if (target_proc != proc_ref_locked(target_proc)) {
continue;
}
proc_list_unlock();
- memorystatus_klist_unlock();
target_pid = target_proc->p_pid;
if (level_snapshot == kVMPressureWarning || level_snapshot == kVMPressureUrgent) {
- if (is_knote_registered_modify_task_pressure_bits(kn_max, NOTE_MEMORYSTATUS_PRESSURE_WARN, task, kVMPressureCritical, kVMPressureWarning) == TRUE) {
+ 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, kVMPressureWarning, kVMPressureCritical) == TRUE) {
+ if (is_knote_registered_modify_task_pressure_bits(kn_max, NOTE_MEMORYSTATUS_PRESSURE_CRITICAL, task, 0, kVMPressureCritical) == TRUE) {
found_candidate = TRUE;
}
}
}
if (found_candidate == FALSE) {
+ proc_rele(target_proc);
+ memorystatus_klist_unlock();
continue;
}
- memorystatus_klist_lock();
- KNOTE_DETACH(&memorystatus_klist, kn_max);
- KNOTE_ATTACH(&dispatch_klist, kn_max);
- memorystatus_klist_unlock();
+ 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);
+ }
+ }
+ }
KNOTE(&dispatch_klist, (level_snapshot != kVMPressureNormal) ? kMemorystatusPressure : kMemorystatusNoPressure);
- memorystatus_klist_lock();
- KNOTE_DETACH(&dispatch_klist, kn_max);
- KNOTE_ATTACH(&memorystatus_klist, kn_max);
+ SLIST_FOREACH_SAFE(kn_cur, &dispatch_klist, kn_selnext, kn_temp) {
+ KNOTE_DETACH(&dispatch_klist, kn_cur);
+ KNOTE_ATTACH(&memorystatus_klist, kn_cur);
+ }
+
memorystatus_klist_unlock();
microuptime(&target_proc->vm_pressure_last_notify_tstamp);
proc_rele(target_proc);
- if (target_best_process == TRUE) {
+ if (memorystatus_manual_testing_on == TRUE && target_foreground_process == TRUE) {
break;
}
-try_dispatch_vm_clients:
- if (level_snapshot != kVMPressureNormal) {
- /*
- * Wake up idle-exit thread.
- * Targets one process per invocation.
- *
- * TODO: memorystatus_idle_exit_from_VM should return FALSE once it's
- * done with all idle-exitable processes. Currently, we will exit this
- * loop when we are done with notification clients (level and non-level based)
- * but we may still have some idle-exitable processes around.
- *
+ if (memorystatus_manual_testing_on == TRUE) {
+ /*
+ * Testing out the pressure notification scheme.
+ * No need for delays etc.
*/
- memorystatus_idle_exit_from_VM();
+ } 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);
+
+ page_delta = (memorystatus_available_pages_pressure - memorystatus_available_pages_critical_base) / 2;
+ skip_delay_page_threshold = memorystatus_available_pages_pressure - page_delta;
- if ((vm_pressure_notify_dispatch_vm_clients() == KERN_FAILURE) && (kn_max == NULL)) {
+ if (memorystatus_available_pages <= skip_delay_page_threshold) {
/*
- * kn_max == NULL i.e. we didn't find any eligible clients for the level-based notifications
- * AND
- * we have failed to find any eligible clients for the non-level based notifications too.
- * So, we are done.
+ * We are nearing the critcal mark fast and can't afford to wait between
+ * notifications.
*/
-
- return KERN_FAILURE;
+ sleep_interval = 0;
+ }
+#endif /* CONFIG_JETSAM */
+
+ if (sleep_interval) {
+ delay(sleep_interval);
}
- }
-
- if (memorystatus_manual_testing_on == FALSE) {
- delay(INTER_NOTIFICATION_DELAY);
}
}
return KERN_SUCCESS;
}
-vm_pressure_level_t
-convert_internal_pressure_level_to_dispatch_level(vm_pressure_level_t);
-
vm_pressure_level_t
convert_internal_pressure_level_to_dispatch_level(vm_pressure_level_t internal_pressure_level)
{
sysctl_memorystatus_vm_pressure_level SYSCTL_HANDLER_ARGS
{
#pragma unused(arg1, arg2, oidp)
-
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));
}
+#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 */
extern int memorystatus_purge_on_warning;
extern int memorystatus_purge_on_critical;
if (pressure_level == NOTE_MEMORYSTATUS_PRESSURE_NORMAL) {
memorystatus_manual_testing_on = FALSE;
-
- vm_pressure_klist_lock();
- vm_reset_active_list();
- vm_pressure_klist_unlock();
- } else {
-
- vm_pressure_klist_lock();
- vm_pressure_notification_without_levels();
- vm_pressure_klist_unlock();
}
return 0;
SYSCTL_INT(_kern, OID_AUTO, memorystatus_purge_on_critical, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_purge_on_critical, 0, "");
-#endif /* CONFIG_JETSAM && VM_PRESSURE_EVENTS */
+#endif /* VM_PRESSURE_EVENTS */
/* Return both allocated and actual size, since there's a race between allocation and list compilation */
static int
list_entry->pid = p->p_pid;
list_entry->priority = p->p_memstat_effectivepriority;
list_entry->user_data = p->p_memstat_userdata;
-#if LEGACY_HIWATER
- if (((p->p_memstat_state & P_MEMSTAT_MEMLIMIT_BACKGROUND) && (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND)) ||
- (p->p_memstat_memlimit <= 0)) {
- task_get_phys_footprint_limit(p->task, &list_entry->limit);
- } else {
- list_entry->limit = p->p_memstat_memlimit;
- }
-#else
- task_get_phys_footprint_limit(p->task, &list_entry->limit);
-#endif
+
+ /*
+ * No need to consider P_MEMSTAT_MEMLIMIT_BACKGROUND anymore.
+ * Background limits are described via the inactive limit slots.
+ * So, here, the cached limit should always be valid.
+ */
+
+ if (p->p_memstat_memlimit <= 0) {
+ task_get_phys_footprint_limit(p->task, &list_entry->limit);
+ } else {
+ list_entry->limit = p->p_memstat_memlimit;
+ }
+
list_entry->state = memorystatus_build_state(p);
list_entry++;
return error;
}
-#if CONFIG_JETSAM
+#if CONFIG_JETSAM
+
+static void
+memorystatus_clear_errors(void)
+{
+ proc_t p;
+ unsigned int i = 0;
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_CLEAR_ERRORS) | DBG_FUNC_START, 0, 0, 0, 0, 0);
+
+ proc_list_lock();
+
+ p = memorystatus_get_first_proc_locked(&i, TRUE);
+ while (p) {
+ if (p->p_memstat_state & P_MEMSTAT_ERROR) {
+ p->p_memstat_state &= ~P_MEMSTAT_ERROR;
+ }
+ p = memorystatus_get_next_proc_locked(&i, p, TRUE);
+ }
+
+ proc_list_unlock();
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_CLEAR_ERRORS) | DBG_FUNC_END, 0, 0, 0, 0, 0);
+}
+
+static void
+memorystatus_update_levels_locked(boolean_t critical_only) {
+
+ memorystatus_available_pages_critical = memorystatus_available_pages_critical_base;
+
+ /*
+ * If there's an entry in the first bucket, we have idle processes.
+ */
+
+ memstat_bucket_t *first_bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE];
+ if (first_bucket->count) {
+ memorystatus_available_pages_critical += memorystatus_available_pages_critical_idle_offset;
+
+ 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;
+ }
+ }
+
+#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
+
+ if (memorystatus_jetsam_policy & kPolicyMoreFree) {
+ memorystatus_available_pages_critical += memorystatus_policy_more_free_offset_pages;
+ }
+
+ if (critical_only) {
+ return;
+ }
+
+#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
+#endif
+}
+
+static int
+sysctl_kern_memorystatus_policy_more_free SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2, oidp)
+ int error = 0, more_free = 0;
+
+ /*
+ * TODO: Enable this privilege check?
+ *
+ * error = priv_check_cred(kauth_cred_get(), PRIV_VM_JETSAM, 0);
+ * if (error)
+ * return (error);
+ */
+
+ error = sysctl_handle_int(oidp, &more_free, 0, req);
+ if (error || !req->newptr)
+ return (error);
+
+ if ((more_free && ((memorystatus_jetsam_policy & kPolicyMoreFree) == kPolicyMoreFree)) ||
+ (!more_free && ((memorystatus_jetsam_policy & kPolicyMoreFree) == 0))) {
+
+ /*
+ * No change in state.
+ */
+ return 0;
+ }
+
+ proc_list_lock();
+
+ if (more_free) {
+ memorystatus_jetsam_policy |= kPolicyMoreFree;
+ } else {
+ memorystatus_jetsam_policy &= ~kPolicyMoreFree;
+ }
+
+ memorystatus_update_levels_locked(TRUE);
+
+ proc_list_unlock();
+
+ return 0;
+}
+SYSCTL_PROC(_kern, OID_AUTO, memorystatus_policy_more_free, CTLTYPE_INT|CTLFLAG_WR|CTLFLAG_LOCKED|CTLFLAG_MASKED,
+ 0, 0, &sysctl_kern_memorystatus_policy_more_free, "I", "");
+
+/*
+ * Get the at_boot snapshot
+ */
+static int
+memorystatus_get_at_boot_snapshot(memorystatus_jetsam_snapshot_t **snapshot, size_t *snapshot_size, boolean_t size_only) {
+ size_t input_size = *snapshot_size;
+
+ /*
+ * The at_boot snapshot has no entry list.
+ */
+ *snapshot_size = sizeof(memorystatus_jetsam_snapshot_t);
+
+ if (size_only) {
+ return 0;
+ }
+
+ /*
+ * Validate the size of the snapshot buffer
+ */
+ if (input_size < *snapshot_size) {
+ return EINVAL;
+ }
+
+ /*
+ * Update the notification_time only
+ */
+ 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);
+ return 0;
+}
+
+static int
+memorystatus_get_on_demand_snapshot(memorystatus_jetsam_snapshot_t **snapshot, size_t *snapshot_size, boolean_t size_only) {
+ size_t input_size = *snapshot_size;
+ uint32_t ods_list_count = memorystatus_list_count;
+ memorystatus_jetsam_snapshot_t *ods = NULL; /* The on_demand snapshot buffer */
+
+ *snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) + (sizeof(memorystatus_jetsam_snapshot_entry_t) * (ods_list_count));
+
+ if (size_only) {
+ return 0;
+ }
+
+ /*
+ * Validate the size of the snapshot buffer.
+ * This is inherently racey. May want to revisit
+ * this error condition and trim the output when
+ * it doesn't fit.
+ */
+ if (input_size < *snapshot_size) {
+ return EINVAL;
+ }
+
+ /*
+ * Allocate and initialize a snapshot buffer.
+ */
+ ods = (memorystatus_jetsam_snapshot_t *)kalloc(*snapshot_size);
+ if (!ods) {
+ return (ENOMEM);
+ }
-static void
-memorystatus_clear_errors(void)
-{
- proc_t p;
- unsigned int i = 0;
+ memset(ods, 0, *snapshot_size);
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_CLEAR_ERRORS) | DBG_FUNC_START, 0, 0, 0, 0, 0);
-
proc_list_lock();
-
- p = memorystatus_get_first_proc_locked(&i, TRUE);
- while (p) {
- if (p->p_memstat_state & P_MEMSTAT_ERROR) {
- p->p_memstat_state &= ~P_MEMSTAT_ERROR;
- }
- p = memorystatus_get_next_proc_locked(&i, p, TRUE);
- }
-
+ memorystatus_init_jetsam_snapshot_locked(ods, ods_list_count);
proc_list_unlock();
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_CLEAR_ERRORS) | DBG_FUNC_END, 0, 0, 0, 0, 0);
-}
+ /*
+ * Return the kernel allocated, on_demand buffer.
+ * The caller of this routine will copy the data out
+ * to user space and then free the kernel allocated
+ * buffer.
+ */
+ *snapshot = ods;
-static void
-memorystatus_update_levels_locked(boolean_t critical_only) {
- memorystatus_available_pages_critical = memorystatus_available_pages_critical_base;
-#if !LATENCY_JETSAM
- {
- // If there's an entry in the first bucket, we have idle processes
- memstat_bucket_t *first_bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE];
- if (first_bucket->count) {
- memorystatus_available_pages_critical += memorystatus_available_pages_critical_idle_offset;
- }
- }
-#endif
-#if DEBUG || DEVELOPMENT
- if (memorystatus_jetsam_policy & kPolicyDiagnoseActive) {
- memorystatus_available_pages_critical += memorystatus_jetsam_policy_offset_pages_diagnostic;
- }
-#endif
-
- if (critical_only) {
- return;
- }
+ MEMORYSTATUS_DEBUG(7, "memorystatus_get_on_demand_snapshot: returned inputsize (%ld), snapshot_size(%ld), listcount(%ld)\n",
+ (long)input_size, (long)*snapshot_size, (long)ods_list_count);
-#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
-#endif
+ return 0;
}
static int
-memorystatus_get_snapshot(memorystatus_jetsam_snapshot_t **snapshot, size_t *snapshot_size, boolean_t size_only) {
+memorystatus_get_jetsam_snapshot(memorystatus_jetsam_snapshot_t **snapshot, size_t *snapshot_size, boolean_t size_only) {
size_t input_size = *snapshot_size;
-
+
if (memorystatus_jetsam_snapshot_count > 0) {
*snapshot_size = sizeof(memorystatus_jetsam_snapshot_t) + (sizeof(memorystatus_jetsam_snapshot_entry_t) * (memorystatus_jetsam_snapshot_count));
} else {
}
*snapshot = memorystatus_jetsam_snapshot;
-
- MEMORYSTATUS_DEBUG(1, "memorystatus_snapshot: returning %ld for size\n", (long)*snapshot_size);
-
+
+ MEMORYSTATUS_DEBUG(7, "memorystatus_get_jetsam_snapshot: returned inputsize (%ld), snapshot_size(%ld), listcount(%ld)\n",
+ (long)input_size, (long)*snapshot_size, (long)memorystatus_jetsam_snapshot_count);
+
return 0;
}
+
static int
-memorystatus_cmd_get_jetsam_snapshot(user_addr_t buffer, size_t buffer_size, int32_t *retval) {
+memorystatus_cmd_get_jetsam_snapshot(int32_t flags, user_addr_t buffer, size_t buffer_size, int32_t *retval) {
int error = EINVAL;
boolean_t size_only;
+ boolean_t is_default_snapshot = FALSE;
+ boolean_t is_on_demand_snapshot = FALSE;
+ boolean_t is_at_boot_snapshot = FALSE;
memorystatus_jetsam_snapshot_t *snapshot;
-
+
size_only = ((buffer == USER_ADDR_NULL) ? TRUE : FALSE);
-
- error = memorystatus_get_snapshot(&snapshot, &buffer_size, size_only);
+
+ if (flags == 0) {
+ /* Default */
+ 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)) {
+ /*
+ * Unsupported bit set in flag.
+ */
+ return EINVAL;
+ }
+
+ if ((flags & (MEMORYSTATUS_SNAPSHOT_ON_DEMAND | MEMORYSTATUS_SNAPSHOT_AT_BOOT)) ==
+ (MEMORYSTATUS_SNAPSHOT_ON_DEMAND | MEMORYSTATUS_SNAPSHOT_AT_BOOT)) {
+ /*
+ * Can't have both set at the same time.
+ */
+ return EINVAL;
+ }
+
+ if (flags & MEMORYSTATUS_SNAPSHOT_ON_DEMAND) {
+ is_on_demand_snapshot = TRUE;
+ /*
+ * When not requesting the size only, the following call will allocate
+ * an on_demand snapshot buffer, which is freed below.
+ */
+ error = memorystatus_get_on_demand_snapshot(&snapshot, &buffer_size, size_only);
+
+ } else if (flags & MEMORYSTATUS_SNAPSHOT_AT_BOOT) {
+ is_at_boot_snapshot = TRUE;
+ error = memorystatus_get_at_boot_snapshot(&snapshot, &buffer_size, size_only);
+ } else {
+ /*
+ * Invalid flag setting.
+ */
+ return EINVAL;
+ }
+ }
+
if (error) {
goto out;
}
- /* Copy out and reset */
+ /*
+ * Copy the data out to user space and clear the snapshot buffer.
+ * If working with the jetsam snapshot,
+ * clearing the buffer means, reset the count.
+ * If working with an on_demand snapshot
+ * clearing the buffer means, free it.
+ * If working with the at_boot snapshot
+ * there is nothing to clear or update.
+ */
if (!size_only) {
if ((error = copyout(snapshot, buffer, buffer_size)) == 0) {
- snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
+ if (is_default_snapshot) {
+ /*
+ * The jetsam snapshot is never freed, its count is simply reset.
+ */
+ proc_list_lock();
+ snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
+ memorystatus_jetsam_snapshot_last_timestamp = 0;
+ proc_list_unlock();
+ }
+ }
+
+ if (is_on_demand_snapshot) {
+ /*
+ * The on_demand snapshot is always freed,
+ * even if the copyout failed.
+ */
+ if(snapshot) {
+ kfree(snapshot, buffer_size);
+ }
}
}
return error;
}
+/*
+ * Routine: memorystatus_cmd_grp_set_properties
+ * Purpose: Update properties for a group of processes.
+ *
+ * Supported Properties:
+ * [priority]
+ * Move each process out of its effective priority
+ * band and into a new priority band.
+ * Maintains relative order from lowest to highest priority.
+ * In single band, maintains relative order from head to tail.
+ *
+ * eg: before [effectivepriority | pid]
+ * [18 | p101 ]
+ * [17 | p55, p67, p19 ]
+ * [12 | p103 p10 ]
+ * [ 7 | p25 ]
+ * [ 0 | p71, p82, ]
+ *
+ * after [ new band | pid]
+ * [ xxx | p71, p82, p25, p103, p10, p55, p67, p19, p101]
+ *
+ * Returns: 0 on success, else non-zero.
+ *
+ * Caveat: We know there is a race window regarding recycled pids.
+ * A process could be killed before the kernel can act on it here.
+ * If a pid cannot be found in any of the jetsam priority bands,
+ * then we simply ignore it. No harm.
+ * But, if the pid has been recycled then it could be an issue.
+ * In that scenario, we might move an unsuspecting process to the new
+ * priority band. It's not clear how the kernel can safeguard
+ * against this, but it would be an extremely rare case anyway.
+ * The caller of this api might avoid such race conditions by
+ * ensuring that the processes passed in the pid list are suspended.
+ */
+
+
+/* This internal structure can expand when we add support for more properties */
+typedef struct memorystatus_internal_properties
+{
+ proc_t proc;
+ int32_t priority; /* see memorytstatus_priority_entry_t : priority */
+} memorystatus_internal_properties_t;
+
+
static int
-memorystatus_cmd_set_priority_properties(pid_t pid, user_addr_t buffer, size_t buffer_size, __unused int32_t *retval) {
- const uint32_t MAX_ENTRY_COUNT = 2; /* Cap the entry count */
+memorystatus_cmd_grp_set_properties(int32_t flags, user_addr_t buffer, size_t buffer_size, __unused int32_t *retval) {
+
+#pragma unused (flags)
+
+ /*
+ * We only handle setting priority
+ * per process
+ */
+
+ int error = 0;
+ memorystatus_priority_entry_t *entries = NULL;
+ uint32_t entry_count = 0;
+
+ /* This will be the ordered proc list */
+ memorystatus_internal_properties_t *table = NULL;
+ size_t table_size = 0;
+ uint32_t table_count = 0;
+
+ uint32_t i = 0;
+ uint32_t bucket_index = 0;
+ boolean_t head_insert;
+ int32_t new_priority;
- int error;
- uint32_t i;
- uint32_t entry_count;
- memorystatus_priority_properties_t *entries;
+ proc_t p;
+
+ /* Verify inputs */
+ if ((buffer == USER_ADDR_NULL) || (buffer_size == 0) || ((buffer_size % sizeof(memorystatus_priority_entry_t)) != 0)) {
+ error = EINVAL;
+ goto out;
+ }
+
+ entry_count = (buffer_size / sizeof(memorystatus_priority_entry_t));
+ if ((entries = (memorystatus_priority_entry_t *)kalloc(buffer_size)) == NULL) {
+ error = ENOMEM;
+ goto out;
+ }
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_GRP_SET_PROP) | DBG_FUNC_START, entry_count, 0, 0, 0, 0);
+
+ if ((error = copyin(buffer, entries, buffer_size)) != 0) {
+ goto out;
+ }
+
+ /* Verify sanity of input priorities */
+ for (i=0; i < entry_count; i++) {
+ if (entries[i].priority == -1) {
+ /* Use as shorthand for default priority */
+ entries[i].priority = JETSAM_PRIORITY_DEFAULT;
+ } else if ((entries[i].priority == system_procs_aging_band) || (entries[i].priority == applications_aging_band)) {
+ /* Both the aging bands are reserved for internal use;
+ * if requested, adjust to JETSAM_PRIORITY_IDLE. */
+ entries[i].priority = JETSAM_PRIORITY_IDLE;
+ } else if (entries[i].priority == JETSAM_PRIORITY_IDLE_HEAD) {
+ /* JETSAM_PRIORITY_IDLE_HEAD inserts at the head of the idle
+ * queue */
+ /* Deal with this later */
+ } else if ((entries[i].priority < 0) || (entries[i].priority >= MEMSTAT_BUCKET_COUNT)) {
+ /* Sanity check */
+ error = EINVAL;
+ goto out;
+ }
+ }
+
+ table_size = sizeof(memorystatus_internal_properties_t) * entry_count;
+ if ( (table = (memorystatus_internal_properties_t *)kalloc(table_size)) == NULL) {
+ error = ENOMEM;
+ goto out;
+ }
+ memset(table, 0, table_size);
+
+
+ /*
+ * For each jetsam bucket entry, spin through the input property list.
+ * When a matching pid is found, populate an adjacent table with the
+ * appropriate proc pointer and new property values.
+ * This traversal automatically preserves order from lowest
+ * to highest priority.
+ */
+
+ bucket_index=0;
- /* Validate inputs */
- if ((pid == 0) || (buffer == USER_ADDR_NULL) || (buffer_size == 0)) {
- return EINVAL;
+ proc_list_lock();
+
+ /* Create the ordered table */
+ p = memorystatus_get_first_proc_locked(&bucket_index, TRUE);
+ while (p && (table_count < entry_count)) {
+ for (i=0; i < entry_count; i++ ) {
+ if (p->p_pid == entries[i].pid) {
+ /* Build the table data */
+ table[table_count].proc = p;
+ table[table_count].priority = entries[i].priority;
+ table_count++;
+ break;
+ }
+ }
+ p = memorystatus_get_next_proc_locked(&bucket_index, p, TRUE);
+ }
+
+ /* We now have ordered list of procs ready to move */
+ for (i=0; i < table_count; i++) {
+ p = table[i].proc;
+ assert(p != NULL);
+
+ /* Allow head inserts -- but relative order is now */
+ if (table[i].priority == JETSAM_PRIORITY_IDLE_HEAD) {
+ new_priority = JETSAM_PRIORITY_IDLE;
+ head_insert = true;
+ } else {
+ new_priority = table[i].priority;
+ head_insert = false;
+ }
+
+ /* Not allowed */
+ if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
+ continue;
+ }
+
+ /*
+ * Take appropriate steps if moving proc out of
+ * either of the aging bands.
+ */
+ if ((p->p_memstat_effectivepriority == system_procs_aging_band) || (p->p_memstat_effectivepriority == applications_aging_band)) {
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ }
+
+ memorystatus_update_priority_locked(p, new_priority, head_insert, false);
}
+
+ proc_list_unlock();
+
+ /*
+ * if (table_count != entry_count)
+ * then some pids were not found in a jetsam band.
+ * harmless but interesting...
+ */
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_GRP_SET_PROP) | DBG_FUNC_END, entry_count, table_count, 0, 0, 0);
+
+out:
+ if (entries)
+ kfree(entries, buffer_size);
+ if (table)
+ kfree(table, table_size);
+
+ return (error);
+}
+
+
+/*
+ * 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.
+ */
- /* Make sure the buffer is a multiple of the entry size, and that an excessive size isn't specified */
- entry_count = (buffer_size / sizeof(memorystatus_priority_properties_t));
- if (((buffer_size % sizeof(memorystatus_priority_properties_t)) != 0) || (entry_count > MAX_ENTRY_COUNT)) {
+static int
+memorystatus_cmd_set_priority_properties(pid_t pid, user_addr_t buffer, size_t buffer_size, __unused int32_t *retval) {
+ int error = 0;
+ memorystatus_priority_properties_t mpp_entry;
+
+ /* Validate inputs */
+ if ((pid == 0) || (buffer == USER_ADDR_NULL) || (buffer_size != sizeof(memorystatus_priority_properties_t))) {
return EINVAL;
}
-
- entries = (memorystatus_priority_properties_t *)kalloc(buffer_size);
-
- error = copyin(buffer, entries, buffer_size);
- for (i = 0; i < entry_count; i++) {
+ error = copyin(buffer, &mpp_entry, buffer_size);
+
+ if (error == 0) {
proc_t p;
- if (error) {
- break;
- }
-
p = proc_find(pid);
if (!p) {
- error = ESRCH;
- break;
+ return ESRCH;
}
if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
- error = EPERM;
proc_rele(p);
- break;
+ return EPERM;
}
-
- error = memorystatus_update(p, entries[i].priority, entries[i].user_data, FALSE, FALSE, 0, 0);
+
+ error = memorystatus_update(p, mpp_entry.priority, mpp_entry.user_data, FALSE, FALSE, 0, 0, FALSE, FALSE, FALSE);
proc_rele(p);
}
-
- kfree(entries, buffer_size);
-
- return error;
+
+ return(error);
+}
+
+static int
+memorystatus_cmd_set_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;
+
+ /* Validate inputs */
+ if ((pid == 0) || (buffer == USER_ADDR_NULL) || (buffer_size != sizeof(memorystatus_memlimit_properties_t))) {
+ return EINVAL;
+ }
+
+ error = copyin(buffer, &mmp_entry, buffer_size);
+
+ if (error == 0) {
+ error = memorystatus_set_memlimit_properties(pid, &mmp_entry);
+ }
+
+ return(error);
+}
+
+/*
+ * 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
+ * limits will be the same in the no-limit case. Instead we convert limits <= 0 using
+ * task_convert_phys_footprint_limit(). It computes the same limit value that would be written
+ * to the task's ledgers via task_set_phys_footprint_limit().
+ */
+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;
+
+ /* Validate inputs */
+ if ((pid == 0) || (buffer == USER_ADDR_NULL) || (buffer_size != sizeof(memorystatus_memlimit_properties_t))) {
+ return EINVAL;
+ }
+
+ memset (&mmp_entry, 0, sizeof(memorystatus_memlimit_properties_t));
+
+ proc_t p = proc_find(pid);
+ if (!p) {
+ return ESRCH;
+ }
+
+ /*
+ * Get the active limit and attributes.
+ * 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;
+ }
+
+ /*
+ * Get the inactive limit and attributes
+ */
+ 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;
+ }
+ proc_rele(p);
+
+ error = copyout(&mmp_entry, buffer, buffer_size);
+
+ return(error);
+}
+
+
+/*
+ * SPI for kbd - pr24956468
+ * This is a very simple snapshot that calculates how much a
+ * process's phys_footprint exceeds a specific memory limit.
+ * Only the inactive memory limit is supported for now.
+ * The delta is returned as bytes in excess or zero.
+ */
+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) {
+ int error = 0;
+ uint64_t footprint_in_bytes = 0;
+ uint64_t delta_in_bytes = 0;
+ int32_t memlimit_mb = 0;
+ uint64_t memlimit_bytes = 0;
+
+ /* Validate inputs */
+ if ((pid == 0) || (buffer == USER_ADDR_NULL) || (buffer_size != sizeof(uint64_t)) || (flags != 0)) {
+ return EINVAL;
+ }
+
+ proc_t p = proc_find(pid);
+ if (!p) {
+ return ESRCH;
+ }
+
+ /*
+ * Get the inactive limit.
+ * No locks taken since we hold a reference to the proc.
+ */
+
+ if (p->p_memstat_memlimit_inactive <= 0) {
+ task_convert_phys_footprint_limit(-1, &memlimit_mb);
+ } else {
+ memlimit_mb = p->p_memstat_memlimit_inactive;
+ }
+
+ footprint_in_bytes = get_task_phys_footprint(p->task);
+
+ proc_rele(p);
+
+ memlimit_bytes = memlimit_mb * 1024 * 1024; /* MB to bytes */
+
+ /*
+ * Computed delta always returns >= 0 bytes
+ */
+ if (footprint_in_bytes > memlimit_bytes) {
+ delta_in_bytes = footprint_in_bytes - memlimit_bytes;
+ }
+
+ error = copyout(&delta_in_bytes, buffer, sizeof(delta_in_bytes));
+
+ return(error);
}
+
static int
memorystatus_cmd_get_pressure_status(int32_t *retval) {
int error;
return error;
}
+int
+memorystatus_get_pressure_status_kdp() {
+ return (kVMPressureNormal != memorystatus_vm_pressure_level) ? 1 : 0;
+}
+
+/*
+ * Every process, including a P_MEMSTAT_INTERNAL process (currently only pid 1), is allowed to set a HWM.
+ *
+ * This call is inflexible -- it does not distinguish between active/inactive, fatal/non-fatal
+ * So, with 2-level HWM preserving previous behavior will map as follows.
+ * - treat the limit passed in as both an active and inactive limit.
+ * - treat the is_fatal_limit flag as though it applies to both active and inactive limits.
+ *
+ * When invoked via MEMORYSTATUS_CMD_SET_JETSAM_HIGH_WATER_MARK
+ * - the is_fatal_limit is FALSE, meaning the active and inactive limits are non-fatal/soft
+ * - so mapping is (active/non-fatal, inactive/non-fatal)
+ *
+ * When invoked via MEMORYSTATUS_CMD_SET_JETSAM_TASK_LIMIT
+ * - the is_fatal_limit is TRUE, meaning the process's active and inactive limits are fatal/hard
+ * - so mapping is (active/fatal, inactive/fatal)
+ */
+
static int
-memorystatus_cmd_set_jetsam_high_water_mark(pid_t pid, int32_t high_water_mark, __unused int32_t *retval) {
+memorystatus_cmd_set_jetsam_memory_limit(pid_t pid, int32_t high_water_mark, __unused int32_t *retval, boolean_t is_fatal_limit) {
int error = 0;
+ memorystatus_memlimit_properties_t entry;
+
+ entry.memlimit_active = high_water_mark;
+ entry.memlimit_active_attr = 0;
+ entry.memlimit_inactive = high_water_mark;
+ entry.memlimit_inactive_attr = 0;
+
+ if (is_fatal_limit == TRUE) {
+ entry.memlimit_active_attr |= MEMORYSTATUS_MEMLIMIT_ATTR_FATAL;
+ entry.memlimit_inactive_attr |= MEMORYSTATUS_MEMLIMIT_ATTR_FATAL;
+ }
+
+ error = memorystatus_set_memlimit_properties(pid, &entry);
+ return (error);
+}
+
+static int
+memorystatus_set_memlimit_properties(pid_t pid, memorystatus_memlimit_properties_t *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;
}
-
- if (high_water_mark <= 0) {
- high_water_mark = -1; /* Disable */
+
+ /*
+ * Check for valid attribute flags.
+ */
+ valid_attrs |= (MEMORYSTATUS_MEMLIMIT_ATTR_FATAL);
+ if ((entry->memlimit_active_attr & (~valid_attrs)) != 0) {
+ proc_rele(p);
+ return EINVAL;
}
-
- proc_list_lock();
-
- if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
- error = EPERM;
- goto exit;
+ if ((entry->memlimit_inactive_attr & (~valid_attrs)) != 0) {
+ proc_rele(p);
+ return EINVAL;
}
-
- p->p_memstat_memlimit = high_water_mark;
+
+ /*
+ * 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;
+ }
+
+ proc_list_lock();
+
+ /*
+ * Store the active limit variants in the proc.
+ */
+ SET_ACTIVE_LIMITS_LOCKED(p, memlimit_active, memlimit_active_is_fatal);
+
+ /*
+ * Store the inactive limit variants in the proc.
+ */
+ SET_INACTIVE_LIMITS_LOCKED(p, memlimit_inactive, memlimit_inactive_is_fatal);
+
+ /*
+ * Enforce appropriate limit variant by updating the cached values
+ * and writing the ledger.
+ * Limit choice is based on process active/inactive state.
+ */
+
if (memorystatus_highwater_enabled) {
- if (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_BACKGROUND) {
- memorystatus_update_priority_locked(p, p->p_memstat_effectivepriority);
- } else {
- error = (task_set_phys_footprint_limit_internal(p->task, high_water_mark, NULL, TRUE) == 0) ? 0 : EINVAL;
- }
+ boolean_t trigger_exception;
+ /*
+ * No need to consider P_MEMSTAT_MEMLIMIT_BACKGROUND anymore.
+ * Background limits are described via the inactive limit slots.
+ */
+
+ if (proc_jetsam_state_is_active_locked(p) == TRUE) {
+ CACHE_ACTIVE_LIMITS_LOCKED(p, trigger_exception);
+ } else {
+ CACHE_INACTIVE_LIMITS_LOCKED(p, trigger_exception);
+ }
+
+ /* Enforce the limit by writing to the ledgers */
+ assert(trigger_exception == TRUE);
+ error = (task_set_phys_footprint_limit_internal(p->task, ((p->p_memstat_memlimit > 0) ? p->p_memstat_memlimit : -1), NULL, trigger_exception) == 0) ? 0 : EINVAL;
+
+ MEMORYSTATUS_DEBUG(3, "memorystatus_set_memlimit_properties: new limit on pid %d (%dMB %s) current priority (%d) dirty_state?=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") : ""));
+ DTRACE_MEMORYSTATUS2(memorystatus_set_memlimit, proc_t, p, int32_t, (p->p_memstat_memlimit > 0 ? p->p_memstat_memlimit : -1));
}
-exit:
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;
+}
+
#endif /* CONFIG_JETSAM */
int
memorystatus_control(struct proc *p __unused, struct memorystatus_control_args *args, int *ret) {
int error = EINVAL;
+ os_reason_t jetsam_reason = OS_REASON_NULL;
#if !CONFIG_JETSAM
#pragma unused(ret)
+ #pragma unused(jetsam_reason)
#endif
- /* Root only for now */
- if (!kauth_cred_issuser(kauth_cred_get())) {
+ /* Need to be root or have entitlement */
+ if (!kauth_cred_issuser(kauth_cred_get()) && !IOTaskHasEntitlement(current_task(), MEMORYSTATUS_ENTITLEMENT)) {
error = EPERM;
goto out;
}
-
- /* Sanity check */
- if (args->buffersize > MEMORYSTATUS_BUFFERSIZE_MAX) {
- error = EINVAL;
- goto out;
+
+ /*
+ * Sanity check.
+ * Do not enforce it for snapshots.
+ */
+ if (args->command != MEMORYSTATUS_CMD_GET_JETSAM_SNAPSHOT) {
+ if (args->buffersize > MEMORYSTATUS_BUFFERSIZE_MAX) {
+ error = EINVAL;
+ goto out;
+ }
}
switch (args->command) {
case MEMORYSTATUS_CMD_SET_PRIORITY_PROPERTIES:
error = memorystatus_cmd_set_priority_properties(args->pid, 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);
+ break;
+ case MEMORYSTATUS_CMD_GET_MEMLIMIT_PROPERTIES:
+ error = memorystatus_cmd_get_memlimit_properties(args->pid, args->buffer, args->buffersize, ret);
+ break;
+ case MEMORYSTATUS_CMD_GET_MEMLIMIT_EXCESS:
+ error = memorystatus_cmd_get_memlimit_excess_np(args->pid, args->flags, args->buffer, args->buffersize, ret);
+ break;
+ case MEMORYSTATUS_CMD_GRP_SET_PROPERTIES:
+ error = memorystatus_cmd_grp_set_properties((int32_t)args->flags, args->buffer, args->buffersize, ret);
+ break;
case MEMORYSTATUS_CMD_GET_JETSAM_SNAPSHOT:
- error = memorystatus_cmd_get_jetsam_snapshot(args->buffer, args->buffersize, ret);
+ error = memorystatus_cmd_get_jetsam_snapshot((int32_t)args->flags, args->buffer, args->buffersize, ret);
break;
case MEMORYSTATUS_CMD_GET_PRESSURE_STATUS:
error = memorystatus_cmd_get_pressure_status(ret);
break;
case MEMORYSTATUS_CMD_SET_JETSAM_HIGH_WATER_MARK:
- /* TODO: deprecate. Keeping it in as there's no pid based way to set the ledger limit right now. */
- error = memorystatus_cmd_set_jetsam_high_water_mark(args->pid, (int32_t)args->flags, ret);
+ /*
+ * This call does not distinguish between active and inactive limits.
+ * Default behavior in 2-level HWM world is to set both.
+ * Non-fatal limit is also assumed for both.
+ */
+ error = memorystatus_cmd_set_jetsam_memory_limit(args->pid, (int32_t)args->flags, ret, FALSE);
+ break;
+ case MEMORYSTATUS_CMD_SET_JETSAM_TASK_LIMIT:
+ /*
+ * This call does not distinguish between active and inactive limits.
+ * Default behavior in 2-level HWM world is to set both.
+ * Fatal limit is also assumed for both.
+ */
+ error = memorystatus_cmd_set_jetsam_memory_limit(args->pid, (int32_t)args->flags, ret, TRUE);
break;
/* Test commands */
#if DEVELOPMENT || DEBUG
case MEMORYSTATUS_CMD_TEST_JETSAM:
- error = memorystatus_kill_process_sync(args->pid, kMemorystatusKilled) ? 0 : EINVAL;
+ jetsam_reason = os_reason_create(OS_REASON_JETSAM, JETSAM_REASON_GENERIC);
+ if (jetsam_reason == OS_REASON_NULL) {
+ printf("memorystatus_control: failed to allocate jetsam reason\n");
+ }
+
+ 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);
break;
case MEMORYSTATUS_CMD_SET_JETSAM_PANIC_BITS:
error = memorystatus_cmd_set_panic_bits(args->buffer, args->buffersize);
break;
+#else /* DEVELOPMENT || DEBUG */
+ #pragma unused(jetsam_reason)
+#endif /* DEVELOPMENT || DEBUG */
+ case MEMORYSTATUS_CMD_AGGRESSIVE_JETSAM_LENIENT_MODE_ENABLE:
+ if (memorystatus_aggressive_jetsam_lenient_allowed == FALSE) {
+#if DEVELOPMENT || DEBUG
+ printf("Enabling Lenient Mode\n");
+#endif /* DEVELOPMENT || DEBUG */
+
+ memorystatus_aggressive_jetsam_lenient_allowed = TRUE;
+ memorystatus_aggressive_jetsam_lenient = TRUE;
+ error = 0;
+ }
+ break;
+ case MEMORYSTATUS_CMD_AGGRESSIVE_JETSAM_LENIENT_MODE_DISABLE:
+#if DEVELOPMENT || DEBUG
+ printf("Disabling Lenient mode\n");
#endif /* DEVELOPMENT || DEBUG */
+ memorystatus_aggressive_jetsam_lenient_allowed = FALSE;
+ memorystatus_aggressive_jetsam_lenient = FALSE;
+ error = 0;
+ break;
+#endif /* CONFIG_JETSAM */
+ case MEMORYSTATUS_CMD_PRIVILEGED_LISTENER_ENABLE:
+ case MEMORYSTATUS_CMD_PRIVILEGED_LISTENER_DISABLE:
+ error = memorystatus_low_mem_privileged_listener(args->command);
+ break;
+
+#if CONFIG_JETSAM
+ case MEMORYSTATUS_CMD_ELEVATED_INACTIVEJETSAMPRIORITY_ENABLE:
+ case MEMORYSTATUS_CMD_ELEVATED_INACTIVEJETSAMPRIORITY_DISABLE:
+ error = memorystatus_update_inactive_jetsam_priority_band(args->pid, args->command, args->flags ? TRUE : FALSE);
+ break;
#endif /* CONFIG_JETSAM */
+
default:
break;
}
static int
filt_memorystatusattach(struct knote *kn)
{
+ int error;
+
kn->kn_flags |= EV_CLEAR;
- return memorystatus_knote_register(kn);
+ error = memorystatus_knote_register(kn);
+ if (error) {
+ kn->kn_flags = EV_ERROR;
+ kn->kn_data = error;
+ }
+ return 0;
}
static void
switch (hint) {
case kMemorystatusNoPressure:
if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PRESSURE_NORMAL) {
- kn->kn_fflags |= 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;
+ 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;
+ 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;
}
return (kn->kn_fflags != 0);
}
+static int
+filt_memorystatustouch(struct knote *kn, struct kevent_internal_s *kev)
+{
+ int res;
+
+ memorystatus_klist_lock();
+
+ /*
+ * copy in new kevent settings
+ * (saving the "desired" data and fflags).
+ */
+ kn->kn_sfflags = kev->fflags;
+
+ if ((kn->kn_status & KN_UDATA_SPECIFIC) == 0)
+ kn->kn_udata = kev->udata;
+
+ /*
+ * 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);
memorystatus_klist_lock();
- if (kn->kn_sfflags & (NOTE_MEMORYSTATUS_PRESSURE_NORMAL | NOTE_MEMORYSTATUS_PRESSURE_WARN | NOTE_MEMORYSTATUS_PRESSURE_CRITICAL)) {
+ if (kn->kn_sfflags & (NOTE_MEMORYSTATUS_PRESSURE_NORMAL | NOTE_MEMORYSTATUS_PRESSURE_WARN |
+ NOTE_MEMORYSTATUS_PRESSURE_CRITICAL | NOTE_MEMORYSTATUS_LOW_SWAP |
+ NOTE_MEMORYSTATUS_PROC_LIMIT_WARN | NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL)) {
-#if CONFIG_JETSAM && VM_PRESSURE_EVENTS
- /* Need a privilege to register */
- error = priv_check_cred(kauth_cred_get(), PRIV_VM_PRESSURE, 0);
-#endif /* CONFIG_JETSAM && VM_PRESSURE_EVENTS */
+ KNOTE_ATTACH(&memorystatus_klist, kn);
- if (!error) {
- KNOTE_ATTACH(&memorystatus_klist, kn);
- }
} else {
error = ENOTSUP;
}
memorystatus_klist_unlock();
}
+
+#if 0
#if CONFIG_JETSAM && VM_PRESSURE_EVENTS
static boolean_t
memorystatus_issue_pressure_kevent(boolean_t pressured) {
memorystatus_klist_unlock();
return TRUE;
}
-
#endif /* CONFIG_JETSAM && VM_PRESSURE_EVENTS */
+#endif /* 0 */
+
+#if CONFIG_JETSAM
+/* Coalition support */
+
+/* sorting info for a particular priority bucket */
+typedef struct memstat_sort_info {
+ coalition_t msi_coal;
+ uint64_t msi_page_count;
+ pid_t msi_pid;
+ int msi_ntasks;
+} memstat_sort_info_t;
+
+/*
+ * qsort from smallest page count to largest page count
+ *
+ * return < 0 for a < b
+ * 0 for a == b
+ * > 0 for a > b
+ */
+static int memstat_asc_cmp(const void *a, const void *b)
+{
+ const memstat_sort_info_t *msA = (const memstat_sort_info_t *)a;
+ const memstat_sort_info_t *msB = (const memstat_sort_info_t *)b;
+
+ return (int)((uint64_t)msA->msi_page_count - (uint64_t)msB->msi_page_count);
+}
+
+/*
+ * Return the number of pids rearranged during this sort.
+ */
+static int
+memorystatus_sort_by_largest_coalition_locked(unsigned int bucket_index, int coal_sort_order)
+{
+#define MAX_SORT_PIDS 80
+#define MAX_COAL_LEADERS 10
+
+ unsigned int b = bucket_index;
+ int nleaders = 0;
+ int ntasks = 0;
+ proc_t p = NULL;
+ coalition_t coal = COALITION_NULL;
+ int pids_moved = 0;
+ int total_pids_moved = 0;
+ int i;
+
+ /*
+ * The system is typically under memory pressure when in this
+ * path, hence, we want to avoid dynamic memory allocation.
+ */
+ memstat_sort_info_t leaders[MAX_COAL_LEADERS];
+ pid_t pid_list[MAX_SORT_PIDS];
+
+ if (bucket_index >= MEMSTAT_BUCKET_COUNT) {
+ return(0);
+ }
+
+ /*
+ * Clear the array that holds coalition leader information
+ */
+ for (i=0; i < MAX_COAL_LEADERS; i++) {
+ leaders[i].msi_coal = COALITION_NULL;
+ leaders[i].msi_page_count = 0; /* will hold total coalition page count */
+ leaders[i].msi_pid = 0; /* will hold coalition leader pid */
+ leaders[i].msi_ntasks = 0; /* will hold the number of tasks in a coalition */
+ }
+
+ p = memorystatus_get_first_proc_locked(&b, FALSE);
+ while (p) {
+ if (coalition_is_leader(p->task, COALITION_TYPE_JETSAM, &coal)) {
+ if (nleaders < MAX_COAL_LEADERS) {
+ int coal_ntasks = 0;
+ uint64_t coal_page_count = coalition_get_page_count(coal, &coal_ntasks);
+ leaders[nleaders].msi_coal = coal;
+ leaders[nleaders].msi_page_count = coal_page_count;
+ leaders[nleaders].msi_pid = p->p_pid; /* the coalition leader */
+ leaders[nleaders].msi_ntasks = coal_ntasks;
+ nleaders++;
+ } else {
+ /*
+ * We've hit MAX_COAL_LEADERS meaning we can handle no more coalitions.
+ * Abandoned coalitions will linger at the tail of the priority band
+ * when this sort session ends.
+ * TODO: should this be an assert?
+ */
+ printf("%s: WARNING: more than %d leaders in priority band [%d]\n",
+ __FUNCTION__, MAX_COAL_LEADERS, bucket_index);
+ break;
+ }
+ }
+ p=memorystatus_get_next_proc_locked(&b, p, FALSE);
+ }
+
+ if (nleaders == 0) {
+ /* Nothing to sort */
+ return(0);
+ }
+
+ /*
+ * Sort the coalition leader array, from smallest coalition page count
+ * to largest coalition page count. When inserted in the priority bucket,
+ * smallest coalition is handled first, resulting in the last to be jetsammed.
+ */
+ if (nleaders > 1) {
+ qsort(leaders, nleaders, sizeof(memstat_sort_info_t), memstat_asc_cmp);
+ }
+
+#if 0
+ for (i = 0; i < nleaders; i++) {
+ printf("%s: coal_leader[%d of %d] pid[%d] pages[%llu] ntasks[%d]\n",
+ __FUNCTION__, i, nleaders, leaders[i].msi_pid, leaders[i].msi_page_count,
+ leaders[i].msi_ntasks);
+ }
+#endif
+
+ /*
+ * During coalition sorting, processes in a priority band are rearranged
+ * by being re-inserted at the head of the queue. So, when handling a
+ * list, the first process that gets moved to the head of the queue,
+ * ultimately gets pushed toward the queue tail, and hence, jetsams last.
+ *
+ * So, for example, the coalition leader is expected to jetsam last,
+ * after its coalition members. Therefore, the coalition leader is
+ * inserted at the head of the queue first.
+ *
+ * After processing a coalition, the jetsam order is as follows:
+ * undefs(jetsam first), extensions, xpc services, leader(jetsam last)
+ */
+
+ /*
+ * Coalition members are rearranged in the priority bucket here,
+ * based on their coalition role.
+ */
+ total_pids_moved = 0;
+ for (i=0; i < nleaders; i++) {
+
+ /* a bit of bookkeeping */
+ pids_moved = 0;
+
+ /* Coalition leaders are jetsammed last, so move into place first */
+ pid_list[0] = leaders[i].msi_pid;
+ pids_moved += memorystatus_move_list_locked(bucket_index, pid_list, 1);
+
+ /* xpc services should jetsam after extensions */
+ ntasks = coalition_get_pid_list (leaders[i].msi_coal, COALITION_ROLEMASK_XPC,
+ coal_sort_order, pid_list, MAX_SORT_PIDS);
+
+ if (ntasks > 0) {
+ pids_moved += memorystatus_move_list_locked(bucket_index, pid_list,
+ (ntasks <= MAX_SORT_PIDS ? ntasks : MAX_SORT_PIDS));
+ }
+
+ /* extensions should jetsam after unmarked processes */
+ ntasks = coalition_get_pid_list (leaders[i].msi_coal, COALITION_ROLEMASK_EXT,
+ coal_sort_order, pid_list, MAX_SORT_PIDS);
+
+ if (ntasks > 0) {
+ pids_moved += memorystatus_move_list_locked(bucket_index, pid_list,
+ (ntasks <= MAX_SORT_PIDS ? ntasks : MAX_SORT_PIDS));
+ }
+
+ /* undefined coalition members should be the first to jetsam */
+ ntasks = coalition_get_pid_list (leaders[i].msi_coal, COALITION_ROLEMASK_UNDEF,
+ coal_sort_order, pid_list, MAX_SORT_PIDS);
+
+ if (ntasks > 0) {
+ pids_moved += memorystatus_move_list_locked(bucket_index, pid_list,
+ (ntasks <= MAX_SORT_PIDS ? ntasks : MAX_SORT_PIDS));
+ }
+
+#if 0
+ if (pids_moved == leaders[i].msi_ntasks) {
+ /*
+ * All the pids in the coalition were found in this band.
+ */
+ printf("%s: pids_moved[%d] equal total coalition ntasks[%d] \n", __FUNCTION__,
+ pids_moved, leaders[i].msi_ntasks);
+ } else if (pids_moved > leaders[i].msi_ntasks) {
+ /*
+ * Apparently new coalition members showed up during the sort?
+ */
+ printf("%s: pids_moved[%d] were greater than expected coalition ntasks[%d] \n", __FUNCTION__,
+ pids_moved, leaders[i].msi_ntasks);
+ } else {
+ /*
+ * Apparently not all the pids in the coalition were found in this band?
+ */
+ printf("%s: pids_moved[%d] were less than expected coalition ntasks[%d] \n", __FUNCTION__,
+ pids_moved, leaders[i].msi_ntasks);
+ }
+#endif
+
+ total_pids_moved += pids_moved;
+
+ } /* end for */
+
+ return(total_pids_moved);
+}
+
+
+/*
+ * Traverse a list of pids, searching for each within the priority band provided.
+ * If pid is found, move it to the front of the priority band.
+ * Never searches outside the priority band provided.
+ *
+ * Input:
+ * bucket_index - jetsam priority band.
+ * pid_list - pointer to a list of pids.
+ * list_sz - number of pids in the list.
+ *
+ * Pid list ordering is important in that,
+ * pid_list[n] is expected to jetsam ahead of pid_list[n+1].
+ * The sort_order is set by the coalition default.
+ *
+ * Return:
+ * the number of pids found and hence moved within the priority band.
+ */
+static int
+memorystatus_move_list_locked(unsigned int bucket_index, pid_t *pid_list, int list_sz)
+{
+ memstat_bucket_t *current_bucket;
+ int i;
+ int found_pids = 0;
+
+ if ((pid_list == NULL) || (list_sz <= 0)) {
+ return(0);
+ }
+
+ if (bucket_index >= MEMSTAT_BUCKET_COUNT) {
+ return(0);
+ }
+
+ current_bucket = &memstat_bucket[bucket_index];
+ for (i=0; i < list_sz; i++) {
+ unsigned int b = bucket_index;
+ proc_t p = NULL;
+ proc_t aProc = NULL;
+ pid_t aPid;
+ int list_index;
+
+ list_index = ((list_sz - 1) - i);
+ aPid = pid_list[list_index];
+
+ /* never search beyond bucket_index provided */
+ p = memorystatus_get_first_proc_locked(&b, FALSE);
+ while (p) {
+ if (p->p_pid == aPid) {
+ aProc = p;
+ break;
+ }
+ p = memorystatus_get_next_proc_locked(&b, p, FALSE);
+ }
+
+ if (aProc == NULL) {
+ /* pid not found in this band, just skip it */
+ continue;
+ } else {
+ TAILQ_REMOVE(¤t_bucket->list, aProc, p_memstat_list);
+ TAILQ_INSERT_HEAD(¤t_bucket->list, aProc, p_memstat_list);
+ found_pids++;
+ }
+ }
+ return(found_pids);
+}
+#endif /* CONFIG_JETSAM */
projects / apple / xnu.git / blobdiff