* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*
*/
-/*-
- * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <sys/kern_event.h>
-#include <sys/kern_memorystatus.h>
#include <kern/sched_prim.h>
+#include <kern/kalloc.h>
+#include <kern/assert.h>
+#include <kern/debug.h>
+#include <kern/locks.h>
#include <kern/task.h>
#include <kern/thread.h>
+#include <kern/host.h>
#include <libkern/libkern.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/kern_event.h>
+#include <sys/proc.h>
+#include <sys/proc_info.h>
+#include <sys/signal.h>
+#include <sys/signalvar.h>
#include <sys/sysctl.h>
+#include <sys/sysproto.h>
+#include <sys/wait.h>
+#include <sys/tree.h>
+#include <sys/priv.h>
+#include <vm/vm_pageout.h>
+#include <vm/vm_protos.h>
+
+#if CONFIG_FREEZE
+#include <vm/vm_map.h>
+#endif /* CONFIG_FREEZE */
+
+#include <sys/kern_memorystatus.h>
+
+#if CONFIG_JETSAM
+/* 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 */
+};
+
+/* 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
+
+/* These are very verbose printfs(), enable with
+ * MEMORYSTATUS_DEBUG_LOG
+ */
+#if MEMORYSTATUS_DEBUG_LOG
+#define MEMORYSTATUS_DEBUG(cond, format, ...) \
+do { \
+ if (cond) { printf(format, ##__VA_ARGS__); } \
+} while(0)
+#else
+#define MEMORYSTATUS_DEBUG(cond, format, ...)
+#endif
+
+/* General tunables */
+
+unsigned long delta_percentage = 5;
+unsigned long critical_threshold_percentage = 5;
+unsigned long idle_offset_percentage = 5;
+unsigned long pressure_threshold_percentage = 15;
+unsigned long freeze_threshold_percentage = 50;
+
+/* General memorystatus stuff */
+
+struct klist memorystatus_klist;
+static lck_mtx_t memorystatus_klist_mutex;
+
+static void memorystatus_klist_lock(void);
+static void memorystatus_klist_unlock(void);
+
+static uint64_t memorystatus_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);
+
+struct filterops memorystatus_filtops = {
+ .f_attach = filt_memorystatusattach,
+ .f_detach = filt_memorystatusdetach,
+ .f_event = filt_memorystatus,
+};
+
+enum {
+ kMemorystatusNoPressure = 0x1,
+ kMemorystatusPressure = 0x2,
+ kMemorystatusLowSwap = 0x4
+};
+
+/* Idle guard handling */
+
+static int32_t memorystatus_scheduled_idle_demotions = 0;
+
+static thread_call_t memorystatus_idle_demotion_call;
+
+static void memorystatus_perform_idle_demotion(__unused void *spare1, __unused void *spare2);
+static void memorystatus_schedule_idle_demotion_locked(proc_t p, boolean_t set_state);
+static void memorystatus_invalidate_idle_demotion_locked(proc_t p, boolean_t clean_state);
+static void memorystatus_reschedule_idle_demotion_locked(void);
+
+static void memorystatus_update_priority_locked(proc_t p, int priority, boolean_t head_insert);
+
+boolean_t is_knote_registered_modify_task_pressure_bits(struct knote*, int, task_t, vm_pressure_level_t, vm_pressure_level_t);
+void memorystatus_send_low_swap_note(void);
+
+int memorystatus_wakeup = 0;
+
+unsigned int memorystatus_level = 0;
+
+static int memorystatus_list_count = 0;
+
+#define MEMSTAT_BUCKET_COUNT (JETSAM_PRIORITY_MAX + 1)
+
+typedef struct memstat_bucket {
+ TAILQ_HEAD(, proc) list;
+ int count;
+} memstat_bucket_t;
+
+memstat_bucket_t memstat_bucket[MEMSTAT_BUCKET_COUNT];
+
+uint64_t memstat_idle_demotion_deadline = 0;
+
+static unsigned int memorystatus_dirty_count = 0;
+
+
+int
+memorystatus_get_level(__unused struct proc *p, struct memorystatus_get_level_args *args, __unused int *ret)
+{
+ user_addr_t level = 0;
+
+ level = args->level;
+
+ if (copyout(&memorystatus_level, level, sizeof(memorystatus_level)) != 0) {
+ return EFAULT;
+ }
+
+ return 0;
+}
+
+static proc_t memorystatus_get_first_proc_locked(unsigned int *bucket_index, boolean_t search);
+static proc_t memorystatus_get_next_proc_locked(unsigned int *bucket_index, proc_t p, boolean_t search);
+
+static void memorystatus_thread(void *param __unused, wait_result_t wr __unused);
+
+/* Jetsam */
+
+#if CONFIG_JETSAM
+
+int proc_get_memstat_priority(proc_t, boolean_t);
+
+/* Kill processes exceeding their limit either under memory pressure (1), or as soon as possible (0) */
+#define LEGACY_HIWATER 1
+
+static boolean_t memorystatus_idle_snapshot = 0;
+
+static int memorystatus_highwater_enabled = 1;
+
+unsigned int memorystatus_delta = 0;
+
+static unsigned int memorystatus_available_pages_critical_base = 0;
+//static unsigned int memorystatus_last_foreground_pressure_pages = (unsigned int)-1;
+static unsigned int memorystatus_available_pages_critical_idle_offset = 0;
+
+#if DEVELOPMENT || DEBUG
+static unsigned int memorystatus_jetsam_panic_debug = 0;
+
+static unsigned int memorystatus_jetsam_policy = kPolicyDefault;
+static unsigned int memorystatus_jetsam_policy_offset_pages_diagnostic = 0;
+#endif
+
+static unsigned int memorystatus_thread_wasted_wakeup = 0;
+
+static uint32_t kill_under_pressure_cause = 0;
+
+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 void memorystatus_clear_errors(void);
+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 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_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_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);
+
+#endif /* CONFIG_JETSAM */
+
+/* VM pressure */
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 void kern_memorystatus_thread(void);
+#if VM_PRESSURE_EVENTS
-int kern_memorystatus_wakeup = 0;
-int kern_memorystatus_level = 0;
-int kern_memorystatus_last_level = 0;
-unsigned int kern_memorystatus_kev_failure_count = 0;
+#include "vm_pressure.h"
-SYSCTL_INT(_kern, OID_AUTO, memorystatus_level, CTLFLAG_RD, &kern_memorystatus_level, 0, "");
-SYSCTL_UINT(_kern, OID_AUTO, memorystatus_kev_failure_count, CTLFLAG_RD, &kern_memorystatus_kev_failure_count, 0, "");
+extern boolean_t memorystatus_warn_process(pid_t pid, boolean_t critical);
-__private_extern__ void
-kern_memorystatus_init(void)
+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;
+
+/*
+ * 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 */
+
+/* Freeze */
+
+#if CONFIG_FREEZE
+
+boolean_t memorystatus_freeze_enabled = FALSE;
+int memorystatus_freeze_wakeup = 0;
+
+static inline boolean_t memorystatus_can_freeze_processes(void);
+static boolean_t memorystatus_can_freeze(boolean_t *memorystatus_freeze_swap_low);
+
+static void memorystatus_freeze_thread(void *param __unused, wait_result_t wr __unused);
+
+/* Thresholds */
+static unsigned int memorystatus_freeze_threshold = 0;
+
+static unsigned int memorystatus_freeze_pages_min = 0;
+static unsigned int memorystatus_freeze_pages_max = 0;
+
+static unsigned int memorystatus_freeze_suspended_threshold = FREEZE_SUSPENDED_THRESHOLD_DEFAULT;
+
+/* Stats */
+static uint64_t memorystatus_freeze_count = 0;
+static uint64_t memorystatus_freeze_pageouts = 0;
+
+/* Throttling */
+static throttle_interval_t throttle_intervals[] = {
+ { 60, 8, 0, 0, { 0, 0 }, FALSE }, /* 1 hour intermediate interval, 8x burst */
+ { 24 * 60, 1, 0, 0, { 0, 0 }, FALSE }, /* 24 hour long interval, no burst */
+};
+
+static uint64_t memorystatus_freeze_throttle_count = 0;
+
+static unsigned int memorystatus_suspended_footprint_total = 0;
+
+#endif /* CONFIG_FREEZE */
+
+/* Debug */
+
+extern struct knote *vm_find_knote_from_pid(pid_t, struct klist *);
+
+#if DEVELOPMENT || DEBUG
+
+#if CONFIG_JETSAM
+
+/* Debug aid to aid determination of limit */
+
+static int
+sysctl_memorystatus_highwater_enable SYSCTL_HANDLER_ARGS
{
- (void)kernel_thread(kernel_task, kern_memorystatus_thread);
+#pragma unused(oidp, arg2)
+ 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) {
+ return (error);
+ }
+
+ error = SYSCTL_IN(req, &enable, sizeof(int));
+ if (error || !req->newptr) {
+ return (error);
+ }
+
+ if (!(enable == 0 || enable == 1)) {
+ return EINVAL;
+ }
+
+ proc_list_lock();
+
+ p = memorystatus_get_first_proc_locked(&b, TRUE);
+ while (p) {
+ if (enable) {
+ if ((p->p_memstat_state & P_MEMSTAT_MEMLIMIT_BACKGROUND) && (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND)) {
+ memlimit = -1;
+ } else {
+ memlimit = p->p_memstat_memlimit;
+ }
+ } else {
+ memlimit = -1;
+ }
+ task_set_phys_footprint_limit_internal(p->task, (memlimit > 0) ? memlimit : -1, NULL, TRUE);
+
+ if (memlimit == -1) {
+ p->p_memstat_state |= P_MEMSTAT_FATAL_MEMLIMIT;
+ } else {
+ if (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_BACKGROUND) {
+ p->p_memstat_state &= ~P_MEMSTAT_FATAL_MEMLIMIT;
+ }
+ }
+
+ p = memorystatus_get_next_proc_locked(&b, p, TRUE);
+ }
+
+ memorystatus_highwater_enabled = enable;
+
+ proc_list_unlock();
+
+ return 0;
}
-static void
-kern_memorystatus_thread(void)
+SYSCTL_INT(_kern, OID_AUTO, memorystatus_idle_snapshot, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_idle_snapshot, 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, "");
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical_idle_offset, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_available_pages_critical_idle_offset, 0, "");
+
+/* Diagnostic code */
+
+enum {
+ kJetsamDiagnosticModeNone = 0,
+ kJetsamDiagnosticModeAll = 1,
+ kJetsamDiagnosticModeStopAtFirstActive = 2,
+ kJetsamDiagnosticModeCount
+} jetsam_diagnostic_mode = kJetsamDiagnosticModeNone;
+
+static int jetsam_diagnostic_suspended_one_active_proc = 0;
+
+static int
+sysctl_jetsam_diagnostic_mode SYSCTL_HANDLER_ARGS
{
- struct kev_msg ev_msg;
- struct {
- uint32_t free_pages;
- uint32_t active_pages;
- uint32_t inactive_pages;
- uint32_t purgeable_pages;
- uint32_t wired_pages;
- } data;
- int ret;
+#pragma unused(arg1, arg2)
+
+ const char *diagnosticStrings[] = {
+ "jetsam: diagnostic mode: resetting critical level.",
+ "jetsam: diagnostic mode: will examine all processes",
+ "jetsam: diagnostic mode: will stop at first active process"
+ };
+
+ int error, val = jetsam_diagnostic_mode;
+ boolean_t changed = FALSE;
+
+ error = sysctl_handle_int(oidp, &val, 0, req);
+ if (error || !req->newptr)
+ return (error);
+ if ((val < 0) || (val >= kJetsamDiagnosticModeCount)) {
+ printf("jetsam: diagnostic mode: invalid value - %d\n", val);
+ return EINVAL;
+ }
+
+ proc_list_lock();
+
+ if ((unsigned int) val != jetsam_diagnostic_mode) {
+ jetsam_diagnostic_mode = val;
+
+ memorystatus_jetsam_policy &= ~kPolicyDiagnoseActive;
+
+ switch (jetsam_diagnostic_mode) {
+ case kJetsamDiagnosticModeNone:
+ /* Already cleared */
+ break;
+ case kJetsamDiagnosticModeAll:
+ memorystatus_jetsam_policy |= kPolicyDiagnoseAll;
+ break;
+ case kJetsamDiagnosticModeStopAtFirstActive:
+ memorystatus_jetsam_policy |= kPolicyDiagnoseFirst;
+ break;
+ default:
+ /* Already validated */
+ break;
+ }
+
+ memorystatus_update_levels_locked(FALSE);
+ changed = TRUE;
+ }
+
+ proc_list_unlock();
+
+ if (changed) {
+ printf("%s\n", diagnosticStrings[val]);
+ }
+
+ return (0);
+}
+
+SYSCTL_PROC(_debug, OID_AUTO, jetsam_diagnostic_mode, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_LOCKED|CTLFLAG_ANYBODY,
+ &jetsam_diagnostic_mode, 0, sysctl_jetsam_diagnostic_mode, "I", "Jetsam Diagnostic Mode");
+
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_jetsam_policy_offset_pages_diagnostic, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_jetsam_policy_offset_pages_diagnostic, 0, "");
+
+#if VM_PRESSURE_EVENTS
+
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_pressure, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_available_pages_pressure, 0, "");
- while(1) {
+
+/*
+ * 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;
+ int ret = 0;
+ struct knote *kn = NULL;
+
+ error = sysctl_handle_int(oidp, &pid, 0, req);
+ if (error || !req->newptr)
+ return (error);
+
+ /*
+ * We inspect 3 lists here for targeted notifications:
+ * - memorystatus_klist
+ * - vm_pressure_klist
+ * - vm_pressure_dormant_klist
+ *
+ * The vm_pressure_* lists are tied to the old VM_PRESSURE
+ * notification mechanism. We intend to stop using that
+ * mechanism and, in turn, get rid of the 2 lists and
+ * vm_dispatch_pressure_note_to_pid() too.
+ */
+
+ memorystatus_klist_lock();
+ kn = vm_find_knote_from_pid(pid, &memorystatus_klist);
+ if (kn) {
+ /*
+ * Forcibly send this pid a "warning" memory pressure notification.
+ */
+ kn->kn_fflags |= NOTE_MEMORYSTATUS_PRESSURE_WARN;
+ KNOTE(&memorystatus_klist, kMemorystatusPressure);
+ ret = 0;
+ } else {
+ ret = vm_dispatch_pressure_note_to_pid(pid, FALSE);
+ }
+ memorystatus_klist_unlock();
+
+ return ret;
+}
+
+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 */
+
+#if CONFIG_FREEZE
+
+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, "");
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_pages_max, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_freeze_pages_max, 0, "");
+
+SYSCTL_QUAD(_kern, OID_AUTO, memorystatus_freeze_count, CTLFLAG_RD|CTLFLAG_LOCKED, &memorystatus_freeze_count, "");
+SYSCTL_QUAD(_kern, OID_AUTO, memorystatus_freeze_pageouts, CTLFLAG_RD|CTLFLAG_LOCKED, &memorystatus_freeze_pageouts, "");
+SYSCTL_QUAD(_kern, OID_AUTO, memorystatus_freeze_throttle_count, CTLFLAG_RD|CTLFLAG_LOCKED, &memorystatus_freeze_throttle_count, "");
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_min_processes, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_freeze_suspended_threshold, 0, "");
+
+boolean_t memorystatus_freeze_throttle_enabled = TRUE;
+SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_throttle_enabled, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_freeze_throttle_enabled, 0, "");
+
+/*
+ * 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);
+
+ 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_SWAPBACKED) {
+ max_pages = MIN(default_pager_swap_pages_free(), memorystatus_freeze_pages_max);
+ } else {
+ 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;
+ return error;
+ }
+ return EINVAL;
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, memorystatus_freeze, CTLTYPE_INT|CTLFLAG_WR|CTLFLAG_LOCKED|CTLFLAG_MASKED,
+ 0, 0, &sysctl_memorystatus_freeze, "I", "");
+
+static int
+sysctl_memorystatus_available_pages_thaw SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2)
+
+ 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;
+ }
+
+ return EINVAL;
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, memorystatus_thaw, CTLTYPE_INT|CTLFLAG_WR|CTLFLAG_LOCKED|CTLFLAG_MASKED,
+ 0, 0, &sysctl_memorystatus_available_pages_thaw, "I", "");
+
+#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 CONFIG_JETSAM
+/*
+ * 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;
+ uint32_t pages = 0, max_pages = 0;
+ memstat_bucket_t *current_bucket;
+
+ if (bucket_index >= MEMSTAT_BUCKET_COUNT) {
+ return;
+ }
- kern_memorystatus_last_level = kern_memorystatus_level;
+ current_bucket = &memstat_bucket[bucket_index];
+
+ p = TAILQ_FIRST(¤t_bucket->list);
+
+ if (p) {
+ memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL, NULL);
+ max_pages = pages;
+ insert_after_proc = NULL;
+
+ p = TAILQ_NEXT(p, p_memstat_list);
+
+restart:
+ while (p) {
+
+ memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL, NULL);
+
+ if (pages > max_pages) {
+ max_pages = pages;
+ max_proc = p;
+ }
+
+ p = TAILQ_NEXT(p, p_memstat_list);
+ }
+
+ if (max_proc) {
- ev_msg.vendor_code = KEV_VENDOR_APPLE;
- ev_msg.kev_class = KEV_SYSTEM_CLASS;
- ev_msg.kev_subclass = KEV_MEMORYSTATUS_SUBCLASS;
+ TAILQ_REMOVE(¤t_bucket->list, max_proc, p_memstat_list);
- /* pass the memory status level in the event code (as percent used) */
- ev_msg.event_code = 100 - kern_memorystatus_last_level;
+ 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);
+ }
- ev_msg.dv[0].data_length = sizeof data;
- ev_msg.dv[0].data_ptr = &data;
- ev_msg.dv[1].data_length = 0;
+ insert_after_proc = max_proc;
- data.free_pages = vm_page_free_count;
- data.active_pages = vm_page_active_count;
- data.inactive_pages = vm_page_inactive_count;
- data.purgeable_pages = vm_page_purgeable_count;
- data.wired_pages = vm_page_wire_count;
+ /* Reset parameters for the new search. */
+ p = TAILQ_NEXT(max_proc, p_memstat_list);
+ if (p) {
+ memorystatus_get_task_page_counts(p->task, &pages, NULL, NULL, NULL);
+ max_pages = pages;
+ }
+ max_proc = NULL;
- ret = kev_post_msg(&ev_msg);
- if (ret) {
- kern_memorystatus_kev_failure_count++;
- printf("%s: kev_post_msg() failed, err %d\n", __func__, ret);
+ goto restart;
}
+ }
+}
+
+#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;
+
+ if ((*bucket_index) >= MEMSTAT_BUCKET_COUNT) {
+ return NULL;
+ }
+
+ current_bucket = &memstat_bucket[*bucket_index];
+ next_p = TAILQ_FIRST(¤t_bucket->list);
+ if (!next_p && search) {
+ while (!next_p && (++(*bucket_index) < MEMSTAT_BUCKET_COUNT)) {
+ current_bucket = &memstat_bucket[*bucket_index];
+ next_p = TAILQ_FIRST(¤t_bucket->list);
+ }
+ }
+
+ return next_p;
+}
+
+static proc_t memorystatus_get_next_proc_locked(unsigned int *bucket_index, proc_t p, boolean_t search) {
+ memstat_bucket_t *current_bucket;
+ proc_t next_p;
+
+ if (!p || ((*bucket_index) >= MEMSTAT_BUCKET_COUNT)) {
+ return NULL;
+ }
+
+ next_p = TAILQ_NEXT(p, p_memstat_list);
+ while (!next_p && search && (++(*bucket_index) < MEMSTAT_BUCKET_COUNT)) {
+ current_bucket = &memstat_bucket[*bucket_index];
+ next_p = TAILQ_FIRST(¤t_bucket->list);
+ }
+
+ return next_p;
+}
+
+__private_extern__ void
+memorystatus_init(void)
+{
+ thread_t thread = THREAD_NULL;
+ kern_return_t result;
+ int i;
+
+#if CONFIG_FREEZE
+ memorystatus_freeze_pages_min = FREEZE_PAGES_MIN;
+ memorystatus_freeze_pages_max = FREEZE_PAGES_MAX;
+#endif
+
+ nanoseconds_to_absolutetime((uint64_t)DEFERRED_IDLE_EXIT_TIME_SECS * NSEC_PER_SEC, &memorystatus_idle_delay_time);
+
+ /* Init buckets */
+ for (i = 0; i < MEMSTAT_BUCKET_COUNT; i++) {
+ TAILQ_INIT(&memstat_bucket[i].list);
+ memstat_bucket[i].count = 0;
+ }
+
+ memorystatus_idle_demotion_call = thread_call_allocate((thread_call_func_t)memorystatus_perform_idle_demotion, NULL);
+
+ /* Apply overrides */
+ PE_get_default("kern.jetsam_delta", &delta_percentage, sizeof(delta_percentage));
+ assert(delta_percentage < 100);
+ PE_get_default("kern.jetsam_critical_threshold", &critical_threshold_percentage, sizeof(critical_threshold_percentage));
+ assert(critical_threshold_percentage < 100);
+ PE_get_default("kern.jetsam_idle_offset", &idle_offset_percentage, sizeof(idle_offset_percentage));
+ assert(idle_offset_percentage < 100);
+ PE_get_default("kern.jetsam_pressure_threshold", &pressure_threshold_percentage, sizeof(pressure_threshold_percentage));
+ assert(pressure_threshold_percentage < 100);
+ PE_get_default("kern.jetsam_freeze_threshold", &freeze_threshold_percentage, sizeof(freeze_threshold_percentage));
+ assert(freeze_threshold_percentage < 100);
+
+#if CONFIG_JETSAM
+ memorystatus_delta = delta_percentage * atop_64(max_mem) / 100;
+ memorystatus_available_pages_critical_idle_offset = idle_offset_percentage * atop_64(max_mem) / 100;
+ memorystatus_available_pages_critical_base = (critical_threshold_percentage / delta_percentage) * memorystatus_delta;
+
+ memorystatus_jetsam_snapshot_max = maxproc;
+ memorystatus_jetsam_snapshot =
+ (memorystatus_jetsam_snapshot_t*)kalloc(sizeof(memorystatus_jetsam_snapshot_t) +
+ sizeof(memorystatus_jetsam_snapshot_entry_t) * memorystatus_jetsam_snapshot_max);
+ if (!memorystatus_jetsam_snapshot) {
+ panic("Could not allocate memorystatus_jetsam_snapshot");
+ }
+
+ /* No contention at this point */
+ memorystatus_update_levels_locked(FALSE);
+#endif
+
+#if CONFIG_FREEZE
+ memorystatus_freeze_threshold = (freeze_threshold_percentage / delta_percentage) * memorystatus_delta;
+#endif
+
+ result = kernel_thread_start_priority(memorystatus_thread, NULL, 95 /* MAXPRI_KERNEL */, &thread);
+ if (result == KERN_SUCCESS) {
+ thread_deallocate(thread);
+ } else {
+ panic("Could not create memorystatus_thread");
+ }
+}
+
+/* Centralised for the purposes of allowing panic-on-jetsam */
+extern void
+vm_wake_compactor_swapper(void);
+
+/*
+ * 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) {
+ int error = 0;
+ error = exit1_internal(p, W_EXITCODE(0, SIGKILL), (int *)NULL, FALSE, FALSE, jetsam_flags);
+ return(error);
+}
- if (kern_memorystatus_level >= kern_memorystatus_last_level + 5 ||
- kern_memorystatus_level <= kern_memorystatus_last_level - 5)
+/*
+ * Wrapper for processes exiting with memorystatus details
+ */
+static boolean_t
+memorystatus_do_kill(proc_t p, uint32_t cause) {
+
+ 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);
+
+#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
+ if (memorystatus_jetsam_panic_debug & (1 << cause)) {
+ panic("memorystatus_do_kill(): jetsam debug panic (cause: %d)", cause);
+ }
+#else
+#pragma unused(cause)
+#endif
+ int jetsam_flags = P_LTERM_JETSAM;
+ switch (cause) {
+ case kMemorystatusKilledHiwat: jetsam_flags |= P_JETSAM_HIWAT; break;
+ case kMemorystatusKilledVnodes: jetsam_flags |= P_JETSAM_VNODE; break;
+ case kMemorystatusKilledVMPageShortage: jetsam_flags |= P_JETSAM_VMPAGESHORTAGE; break;
+ case 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;
+ }
+ error = jetsam_do_kill(p, jetsam_flags);
+
+ KERNEL_DEBUG_CONSTANT( (BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DO_KILL)) | DBG_FUNC_END,
+ victim_pid, cause, vm_page_free_count, error, 0);
+
+ if (COMPRESSED_PAGER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) {
+ vm_wake_compactor_swapper();
+ }
+
+ return (error == 0);
+}
+
+/*
+ * Node manipulation
+ */
+
+static void
+memorystatus_check_levels_locked(void) {
+#if CONFIG_JETSAM
+ /* Update levels */
+ memorystatus_update_levels_locked(TRUE);
+#endif
+}
+
+static void
+memorystatus_perform_idle_demotion(__unused void *spare1, __unused void *spare2)
+{
+ proc_t p;
+ uint64_t current_time;
+ memstat_bucket_t *demotion_bucket;
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_perform_idle_demotion()\n");
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_IDLE_DEMOTE) | DBG_FUNC_START, 0, 0, 0, 0, 0);
+
+ current_time = mach_absolute_time();
+
+ 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 [%s] to idle band, but never dirtied (0x%x)!\n",
+ p->p_pid, (p->p_comm ? p->p_comm : "(unknown)"), p->p_memstat_dirty);
+ }
+#endif
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE, false);
+
+ // The prior process has moved out of the demotion bucket, so grab the new head and continue
+ p = TAILQ_FIRST(&demotion_bucket->list);
continue;
+ }
+
+ // No further candidates
+ break;
+ }
+
+ memorystatus_reschedule_idle_demotion_locked();
+
+ proc_list_unlock();
- assert_wait(&kern_memorystatus_wakeup, THREAD_UNINT);
- (void)thread_block((thread_continue_t)kern_memorystatus_thread);
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_IDLE_DEMOTE) | DBG_FUNC_END, 0, 0, 0, 0, 0);
+}
+
+static void
+memorystatus_schedule_idle_demotion_locked(proc_t p, boolean_t set_state)
+{
+ boolean_t present_in_deferred_bucket = FALSE;
+
+ if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE_DEFERRED) {
+ present_in_deferred_bucket = TRUE;
+ }
+
+ 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);
+
+ assert((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED);
+
+ if (set_state) {
+ assert(p->p_memstat_idledeadline == 0);
+ p->p_memstat_dirty |= P_DIRTY_DEFER_IN_PROGRESS;
+ p->p_memstat_idledeadline = mach_absolute_time() + memorystatus_idle_delay_time;
+ }
+
+ assert(p->p_memstat_idledeadline);
+
+ if (present_in_deferred_bucket == FALSE) {
+ memorystatus_scheduled_idle_demotions++;
}
}
+
+static void
+memorystatus_invalidate_idle_demotion_locked(proc_t p, boolean_t clear_state)
+{
+ boolean_t present_in_deferred_bucket = FALSE;
+
+ if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE_DEFERRED) {
+ present_in_deferred_bucket = TRUE;
+ assert(p->p_memstat_idledeadline);
+ }
+
+ 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);
+
+
+ if (clear_state) {
+ p->p_memstat_idledeadline = 0;
+ p->p_memstat_dirty &= ~P_DIRTY_DEFER_IN_PROGRESS;
+ }
+
+ if (present_in_deferred_bucket == TRUE) {
+ memorystatus_scheduled_idle_demotions--;
+ }
+
+ assert(memorystatus_scheduled_idle_demotions >= 0);
+}
+
+static void
+memorystatus_reschedule_idle_demotion_locked(void) {
+ if (0 == memorystatus_scheduled_idle_demotions) {
+ if (memstat_idle_demotion_deadline) {
+ /* Transitioned 1->0, so cancel next call */
+ thread_call_cancel(memorystatus_idle_demotion_call);
+ memstat_idle_demotion_deadline = 0;
+ }
+ } else {
+ memstat_bucket_t *demotion_bucket;
+ proc_t p;
+ 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;
+ }
+ }
+}
+
+/*
+ * List manipulation
+ */
+
+int
+memorystatus_add(proc_t p, boolean_t locked)
+{
+ memstat_bucket_t *bucket;
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_list_add(): adding process %d with priority %d.\n", p->p_pid, p->p_memstat_effectivepriority);
+
+ if (!locked) {
+ proc_list_lock();
+ }
+
+ /* 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 (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE_DEFERRED) {
+ assert(bucket->count == memorystatus_scheduled_idle_demotions);
+ }
+
+ TAILQ_INSERT_TAIL(&bucket->list, p, p_memstat_list);
+ bucket->count++;
+
+ memorystatus_list_count++;
+
+ memorystatus_check_levels_locked();
+
+exit:
+ if (!locked) {
+ proc_list_unlock();
+ }
+
+ return 0;
+}
+
+static void
+memorystatus_update_priority_locked(proc_t p, int priority, boolean_t head_insert)
+{
+ memstat_bucket_t *old_bucket, *new_bucket;
+
+ assert(priority < MEMSTAT_BUCKET_COUNT);
+
+ /* Ensure that exit isn't underway, leaving the proc retained but removed from its bucket */
+ if ((p->p_listflag & P_LIST_EXITED) != 0) {
+ return;
+ }
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_update_priority_locked(): setting process %d to priority %d, inserting at %s\n",
+ p->p_pid, priority, head_insert ? "head" : "tail");
+
+ old_bucket = &memstat_bucket[p->p_memstat_effectivepriority];
+ if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE_DEFERRED) {
+ assert(old_bucket->count == (memorystatus_scheduled_idle_demotions + 1));
+ }
+
+ TAILQ_REMOVE(&old_bucket->list, p, p_memstat_list);
+ old_bucket->count--;
+
+ new_bucket = &memstat_bucket[priority];
+ if (head_insert)
+ TAILQ_INSERT_HEAD(&new_bucket->list, p, p_memstat_list);
+ else
+ TAILQ_INSERT_TAIL(&new_bucket->list, p, p_memstat_list);
+ new_bucket->count++;
+
+#if CONFIG_JETSAM
+ if (memorystatus_highwater_enabled && (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_BACKGROUND)) {
+
+ /*
+ * Adjust memory limit based on if the task is going to/from foreground and 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 (memlimit <= 0) {
+ p->p_memstat_state |= P_MEMSTAT_FATAL_MEMLIMIT;
+ } else {
+ p->p_memstat_state &= ~P_MEMSTAT_FATAL_MEMLIMIT;
+ }
+ }
+ }
+#endif
+
+ p->p_memstat_effectivepriority = priority;
+
+ memorystatus_check_levels_locked();
+}
+
+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, boolean_t is_fatal_limit)
+{
+ int ret;
+ boolean_t head_insert = false;
+
+#if !CONFIG_JETSAM
+#pragma unused(update_memlimit, memlimit, memlimit_background, is_fatal_limit)
+#endif
+
+ 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. */
+ priority = JETSAM_PRIORITY_IDLE;
+ } else if (priority == JETSAM_PRIORITY_IDLE_HEAD) {
+ /* JETSAM_PRIORITY_IDLE_HEAD inserts at the head of the idle queue */
+ priority = JETSAM_PRIORITY_IDLE;
+ head_insert = true;
+ } else if ((priority < 0) || (priority >= MEMSTAT_BUCKET_COUNT)) {
+ /* Sanity check */
+ ret = EINVAL;
+ goto out;
+ }
+
+ proc_list_lock();
+
+ assert(!(p->p_memstat_state & P_MEMSTAT_INTERNAL));
+
+ if (effective && (p->p_memstat_state & P_MEMSTAT_PRIORITYUPDATED)) {
+ ret = EALREADY;
+ proc_list_unlock();
+ MEMORYSTATUS_DEBUG(1, "memorystatus_update: effective change specified for pid %d, but change already occurred.\n", p->p_pid);
+ goto out;
+ }
+
+ if ((p->p_memstat_state & P_MEMSTAT_TERMINATED) || ((p->p_listflag & P_LIST_EXITED) != 0)) {
+ /*
+ * This could happen when a process calling posix_spawn() is exiting on the jetsam thread.
+ */
+ 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;
+ if (memlimit_background) {
+ /* Will be set as priority is updated */
+ p->p_memstat_state |= P_MEMSTAT_MEMLIMIT_BACKGROUND;
+
+ /* Cannot have a background memory limit and be fatal. */
+ is_fatal_limit = FALSE;
+
+ } else {
+ /* Otherwise, apply now */
+ if (memorystatus_highwater_enabled) {
+ task_set_phys_footprint_limit_internal(p->task, (memlimit > 0) ? memlimit : -1, NULL, TRUE);
+ }
+ }
+
+ if (is_fatal_limit || memlimit <= 0) {
+ p->p_memstat_state |= P_MEMSTAT_FATAL_MEMLIMIT;
+ } else {
+ p->p_memstat_state &= ~P_MEMSTAT_FATAL_MEMLIMIT;
+ }
+ }
+#endif
+
+ /*
+ * We can't add to the JETSAM_PRIORITY_IDLE_DEFERRED bucket here.
+ * But, we could be removing it from the bucket.
+ * Check and take appropriate steps if so.
+ */
+
+ if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE_DEFERRED) {
+
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ }
+
+ memorystatus_update_priority_locked(p, priority, head_insert);
+
+ proc_list_unlock();
+ ret = 0;
+
+out:
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_UPDATE) | DBG_FUNC_END, ret, 0, 0, 0, 0);
+
+ return ret;
+}
+
+int
+memorystatus_remove(proc_t p, boolean_t locked)
+{
+ int ret;
+ memstat_bucket_t *bucket;
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_list_remove: removing process %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 (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE_DEFERRED) {
+ assert(bucket->count == memorystatus_scheduled_idle_demotions);
+ }
+
+ 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) {
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ memorystatus_reschedule_idle_demotion_locked();
+ }
+
+ memorystatus_check_levels_locked();
+
+#if CONFIG_FREEZE
+ if (p->p_memstat_state & (P_MEMSTAT_FROZEN)) {
+ memorystatus_frozen_count--;
+ }
+
+ if (p->p_memstat_state & P_MEMSTAT_SUSPENDED) {
+ memorystatus_suspended_footprint_total -= p->p_memstat_suspendedfootprint;
+ memorystatus_suspended_count--;
+ }
+#endif
+
+ if (!locked) {
+ proc_list_unlock();
+ }
+
+ if (p) {
+ ret = 0;
+ } else {
+ ret = ESRCH;
+ }
+
+ return ret;
+}
+
+static boolean_t
+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;
+ }
+
+ /* Idle exit requires that process be tracked */
+ if ((pcontrol & PROC_DIRTY_ALLOW_IDLE_EXIT) &&
+ !(pcontrol & PROC_DIRTY_TRACK)) {
+ return FALSE;
+ }
+
+ /* 'Launch in progress' tracking requires that process have enabled dirty tracking too. */
+ if ((pcontrol & PROC_DIRTY_LAUNCH_IN_PROGRESS) &&
+ !(pcontrol & PROC_DIRTY_TRACK)) {
+ return FALSE;
+ }
+
+ /* Deferral is only relevant if idle exit is specified */
+ if ((pcontrol & PROC_DIRTY_DEFER) &&
+ !(pcontrol & PROC_DIRTY_ALLOWS_IDLE_EXIT)) {
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+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);
+
+ 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;
+ } else {
+ priority = p->p_memstat_requestedpriority;
+ }
+
+ if (priority != p->p_memstat_effectivepriority) {
+ memorystatus_update_priority_locked(p, priority, false);
+ }
+}
+
+/*
+ * Processes can opt to have their state tracked by the kernel, indicating when they are busy (dirty) or idle
+ * (clean). They may also indicate that they support termination when idle, with the result that they are promoted
+ * to their desired, higher, jetsam priority when dirty (and are therefore killed later), and demoted to the low
+ * priority idle band when clean (and killed earlier, protecting higher priority procesess).
+ *
+ * If the deferral flag is set, then newly tracked processes will be protected for an initial period (as determined by
+ * memorystatus_idle_delay_time); if they go clean during this time, then they will be moved to a deferred-idle band
+ * with a slightly higher priority, guarding against immediate termination under memory pressure and being unable to
+ * make forward progress. Finally, when the guard expires, they will be moved to the standard, lowest-priority, idle
+ * band. The deferral can be cleared early by clearing the appropriate flag.
+ *
+ * The deferral timer is active only for the duration that the process is marked as guarded and clean; if the process
+ * is marked dirty, the timer will be cancelled. Upon being subsequently marked clean, the deferment will either be
+ * re-enabled or the guard state cleared, depending on whether the guard deadline has passed.
+ */
+
+int
+memorystatus_dirty_track(proc_t p, uint32_t pcontrol) {
+ unsigned int old_dirty;
+ boolean_t reschedule = FALSE;
+ boolean_t already_deferred = FALSE;
+ boolean_t defer_now = FALSE;
+ int ret;
+
+ 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;
+ goto exit;
+ }
+
+ old_dirty = p->p_memstat_dirty;
+
+ /* These bits are cumulative, as per <rdar://problem/11159924> */
+ if (pcontrol & PROC_DIRTY_TRACK) {
+ p->p_memstat_dirty |= P_DIRTY_TRACK;
+ }
+
+ if (pcontrol & PROC_DIRTY_ALLOW_IDLE_EXIT) {
+ p->p_memstat_dirty |= P_DIRTY_ALLOW_IDLE_EXIT;
+ }
+
+ if (pcontrol & PROC_DIRTY_LAUNCH_IN_PROGRESS) {
+ p->p_memstat_dirty |= P_DIRTY_LAUNCH_IN_PROGRESS;
+ }
+
+ if (old_dirty & P_DIRTY_DEFER_IN_PROGRESS) {
+ already_deferred = TRUE;
+ }
+
+ /* This can be set and cleared exactly once. */
+ 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 / defer %s / dirty %s for process %d\n",
+ ((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) ? "Y" : "N",
+ defer_now ? "Y" : "N",
+ p->p_memstat_dirty & P_DIRTY ? "Y" : "N",
+ p->p_pid);
+
+ /* Kick off or invalidate the idle exit deferment if there's a state transition. */
+ if (!(p->p_memstat_dirty & P_DIRTY_IS_DIRTY)) {
+ if (((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) &&
+ defer_now && !already_deferred) {
+
+ /*
+ * Request to defer a clean process that's idle-exit enabled
+ * and not already in the jetsam deferred band.
+ */
+ memorystatus_schedule_idle_demotion_locked(p, TRUE);
+ reschedule = TRUE;
+
+ } else if (!defer_now && already_deferred) {
+
+ /*
+ * Either the process is no longer idle-exit enabled OR
+ * there's a request to cancel a currently active deferral.
+ */
+ memorystatus_invalidate_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 JETSAM_DEFERRED 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 JETSAM_DEFERRED 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 deferred band".
+ */
+
+ if (!defer_now && already_deferred) {
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ reschedule = TRUE;
+ } else {
+ memorystatus_invalidate_idle_demotion_locked(p, FALSE);
+ reschedule = TRUE;
+ }
+ }
+
+ memorystatus_update_idle_priority_locked(p);
+
+ if (reschedule) {
+ memorystatus_reschedule_idle_demotion_locked();
+ }
+
+ ret = 0;
+
+exit:
+ proc_list_unlock();
+
+ return ret;
+}
+
+int
+memorystatus_dirty_set(proc_t p, boolean_t self, uint32_t pcontrol) {
+ int ret;
+ boolean_t kill = false;
+ boolean_t reschedule = FALSE;
+ boolean_t was_dirty = FALSE;
+ boolean_t now_dirty = FALSE;
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_dirty_set(): %d %d 0x%x 0x%x\n", self, p->p_pid, pcontrol, p->p_memstat_dirty);
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DIRTY_SET), p->p_pid, self, pcontrol, 0, 0);
+
+ proc_list_lock();
+
+ if ((p->p_listflag & P_LIST_EXITED) != 0) {
+ /*
+ * Process is on its way out.
+ */
+ ret = EBUSY;
+ goto exit;
+ }
+
+ if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
+ ret = EPERM;
+ goto exit;
+ }
+
+ if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY)
+ was_dirty = TRUE;
+
+ if (!(p->p_memstat_dirty & P_DIRTY_TRACK)) {
+ /* Dirty tracking not enabled */
+ ret = EINVAL;
+ } else if (pcontrol && (p->p_memstat_dirty & P_DIRTY_TERMINATED)) {
+ /*
+ * Process is set to be terminated and we're attempting to mark it dirty.
+ * Set for termination and marking as clean is OK - see <rdar://problem/10594349>.
+ */
+ ret = EBUSY;
+ } else {
+ int flag = (self == TRUE) ? P_DIRTY : P_DIRTY_SHUTDOWN;
+ if (pcontrol && !(p->p_memstat_dirty & flag)) {
+ /* Mark the process as having been dirtied at some point */
+ p->p_memstat_dirty |= (flag | P_DIRTY_MARKED);
+ memorystatus_dirty_count++;
+ ret = 0;
+ } else if ((pcontrol == 0) && (p->p_memstat_dirty & flag)) {
+ if ((flag == P_DIRTY_SHUTDOWN) && (!p->p_memstat_dirty & P_DIRTY)) {
+ /* Clearing the dirty shutdown flag, and the process is otherwise clean - kill */
+ p->p_memstat_dirty |= P_DIRTY_TERMINATED;
+ kill = true;
+ } else if ((flag == P_DIRTY) && (p->p_memstat_dirty & P_DIRTY_TERMINATED)) {
+ /* Kill previously terminated processes if set clean */
+ kill = true;
+ }
+ p->p_memstat_dirty &= ~flag;
+ memorystatus_dirty_count--;
+ ret = 0;
+ } else {
+ /* Already set */
+ ret = EALREADY;
+ }
+ }
+
+ if (ret != 0) {
+ goto exit;
+ }
+
+ if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY)
+ now_dirty = TRUE;
+
+ if ((was_dirty == TRUE && now_dirty == FALSE) ||
+ (was_dirty == FALSE && now_dirty == TRUE)) {
+
+ /* Manage idle exit deferral, if applied */
+ if ((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_DEFER_IN_PROGRESS)) ==
+ (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_DEFER_IN_PROGRESS)) {
+
+ /*
+ * P_DIRTY_DEFER_IN_PROGRESS means the process is in the deferred band OR it might be heading back
+ * there once it's clean again and has some protection window left.
+ */
+
+ if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
+ /*
+ * New dirty process i.e. "was_dirty == FALSE && now_dirty == TRUE"
+ *
+ * The process will move from the deferred band to its higher requested
+ * jetsam band. But we don't clear its state i.e. we want to remember that
+ * this process was part of the "deferred" band and will return to it.
+ *
+ * This way, we don't let it age beyond the protection
+ * window when it returns to "clean". All the while giving
+ * it a chance to perform its work while "dirty".
+ *
+ */
+ memorystatus_invalidate_idle_demotion_locked(p, FALSE);
+ reschedule = TRUE;
+ } else {
+
+ /*
+ * Process is back from "dirty" to "clean".
+ *
+ * Is its timer up OR does it still have some protection
+ * window left?
+ */
+
+ if (mach_absolute_time() >= p->p_memstat_idledeadline) {
+ /*
+ * The process' deadline has expired. It currently
+ * does not reside in the DEFERRED bucket.
+ *
+ * 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 DEFERRED bucket i.e.
+ * the DIRTY_DEFER_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.
+ */
+ memorystatus_schedule_idle_demotion_locked(p, FALSE);
+ reschedule = TRUE;
+ }
+ }
+ }
+
+ memorystatus_update_idle_priority_locked(p);
+
+ /* If the deferral state changed, reschedule the demotion timer */
+ if (reschedule) {
+ memorystatus_reschedule_idle_demotion_locked();
+ }
+ }
+
+ if (kill) {
+ psignal(p, SIGKILL);
+ }
+
+exit:
+ proc_list_unlock();
+
+ return ret;
+}
+
+int
+memorystatus_dirty_clear(proc_t p, uint32_t pcontrol) {
+
+ int ret = 0;
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_dirty_clear(): %d 0x%x 0x%x\n", p->p_pid, pcontrol, p->p_memstat_dirty);
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_DIRTY_CLEAR), p->p_pid, pcontrol, 0, 0, 0);
+
+ proc_list_lock();
+
+ if ((p->p_listflag & P_LIST_EXITED) != 0) {
+ /*
+ * Process is on its way out.
+ */
+ ret = EBUSY;
+ goto exit;
+ }
+
+ if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
+ ret = EPERM;
+ goto exit;
+ }
+
+ if (!(p->p_memstat_dirty & P_DIRTY_TRACK)) {
+ /* Dirty tracking not enabled */
+ ret = EINVAL;
+ goto exit;
+ }
+
+ if (!pcontrol || (pcontrol & (PROC_DIRTY_LAUNCH_IN_PROGRESS | PROC_DIRTY_DEFER)) == 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, NULL, NULL);
+#endif
+ proc_list_lock();
+#if CONFIG_FREEZE
+ p->p_memstat_suspendedfootprint = pages;
+ memorystatus_suspended_footprint_total += pages;
+ memorystatus_suspended_count++;
+#endif
+ p->p_memstat_state |= P_MEMSTAT_SUSPENDED;
+ proc_list_unlock();
+}
+
+void
+memorystatus_on_resume(proc_t p)
+{
+#if CONFIG_FREEZE
+ boolean_t frozen;
+ pid_t pid;
+#endif
+
+ proc_list_lock();
+
+#if CONFIG_FREEZE
+ frozen = (p->p_memstat_state & P_MEMSTAT_FROZEN);
+ if (frozen) {
+ memorystatus_frozen_count--;
+ p->p_memstat_state |= P_MEMSTAT_PRIOR_THAW;
+ }
+
+ memorystatus_suspended_footprint_total -= p->p_memstat_suspendedfootprint;
+ memorystatus_suspended_count--;
+
+ pid = p->p_pid;
+#endif
+
+ p->p_memstat_state &= ~(P_MEMSTAT_SUSPENDED | P_MEMSTAT_FROZEN);
+
+ proc_list_unlock();
+
+#if CONFIG_FREEZE
+ if (frozen) {
+ memorystatus_freeze_entry_t data = { pid, FALSE, 0 };
+ memorystatus_send_note(kMemorystatusFreezeNote, &data, sizeof(data));
+ }
+#endif
+}
+
+void
+memorystatus_on_inactivity(proc_t p)
+{
+#pragma unused(p)
+#if CONFIG_FREEZE
+ /* Wake the freeze thread */
+ thread_wakeup((event_t)&memorystatus_freeze_wakeup);
+#endif
+}
+
+static uint32_t
+memorystatus_build_state(proc_t p) {
+ uint32_t snapshot_state = 0;
+
+ /* General */
+ if (p->p_memstat_state & P_MEMSTAT_SUSPENDED) {
+ snapshot_state |= kMemorystatusSuspended;
+ }
+ if (p->p_memstat_state & P_MEMSTAT_FROZEN) {
+ snapshot_state |= kMemorystatusFrozen;
+ }
+ if (p->p_memstat_state & P_MEMSTAT_PRIOR_THAW) {
+ snapshot_state |= kMemorystatusWasThawed;
+ }
+
+ /* Tracking */
+ if (p->p_memstat_dirty & P_DIRTY_TRACK) {
+ snapshot_state |= kMemorystatusTracked;
+ }
+ if ((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) {
+ snapshot_state |= kMemorystatusSupportsIdleExit;
+ }
+ if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
+ snapshot_state |= kMemorystatusDirty;
+ }
+
+ return snapshot_state;
+}
+
+#if !CONFIG_JETSAM
+
+static boolean_t
+kill_idle_exit_proc(void)
+{
+ proc_t p, victim_p = PROC_NULL;
+ uint64_t current_time;
+ boolean_t killed = FALSE;
+ unsigned int i = 0;
+
+ /* Pick next idle exit victim. */
+ current_time = mach_absolute_time();
+
+ proc_list_lock();
+
+ p = memorystatus_get_first_proc_locked(&i, FALSE);
+ while (p) {
+ /* No need to look beyond the idle band */
+ if (p->p_memstat_effectivepriority != JETSAM_PRIORITY_IDLE) {
+ break;
+ }
+
+ if ((p->p_memstat_dirty & (P_DIRTY_ALLOW_IDLE_EXIT|P_DIRTY_IS_DIRTY|P_DIRTY_TERMINATED)) == (P_DIRTY_ALLOW_IDLE_EXIT)) {
+ if (current_time >= p->p_memstat_idledeadline) {
+ p->p_memstat_dirty |= P_DIRTY_TERMINATED;
+ victim_p = proc_ref_locked(p);
+ break;
+ }
+ }
+
+ p = memorystatus_get_next_proc_locked(&i, p, FALSE);
+ }
+
+ proc_list_unlock();
+
+ if (victim_p) {
+ printf("memorystatus_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);
+ proc_rele(victim_p);
+ }
+
+ 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)
+{
+ if (interval_ms) {
+ assert_wait_timeout(&memorystatus_wakeup, THREAD_UNINT, interval_ms, 1000 * NSEC_PER_USEC);
+ } else {
+ assert_wait(&memorystatus_wakeup, THREAD_UNINT);
+ }
+
+ return thread_block(continuation);
+}
+
+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;
+#endif
+
+ if (is_vm_privileged == FALSE) {
+ /*
+ * It's the first time the thread has run, so just mark the thread as privileged and block.
+ * This avoids a spurious pass with unset variables, as set out in <rdar://problem/9609402>.
+ */
+ thread_wire(host_priv_self(), current_thread(), TRUE);
+ is_vm_privileged = TRUE;
+
+ 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);
+
+ /*
+ * Jetsam aware version.
+ *
+ * The VM pressure notification thread is working it's way through clients in parallel.
+ *
+ * So, while the pressure notification thread is targeting processes in order of
+ * increasing jetsam priority, we can hopefully reduce / stop it's work by killing
+ * any processes that have exceeded their highwater mark.
+ *
+ * If we run out of HWM processes and our available pages drops below the critical threshold, then,
+ * we target the least recently used process in order of increasing jetsam priority (exception: the FG band).
+ */
+ while (is_thrashing(kill_under_pressure_cause) ||
+ memorystatus_available_pages <= memorystatus_available_pages_pressure) {
+ boolean_t killed;
+ int32_t priority;
+ uint32_t cause;
+
+ if (kill_under_pressure_cause) {
+ cause = kill_under_pressure_cause;
+ } else {
+ cause = kMemorystatusKilledVMPageShortage;
+ }
+
+#if LEGACY_HIWATER
+ /* Highwater */
+ killed = memorystatus_kill_hiwat_proc(&errors);
+ if (killed) {
+ hwm_kill++;
+ post_snapshot = TRUE;
+ goto done;
+ } else {
+ memorystatus_hwm_candidates = FALSE;
+ }
+
+ /* 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;
+ }
+#endif
+
+ /* LRU */
+ killed = memorystatus_kill_top_process(TRUE, cause, &priority, &errors);
+ if (killed) {
+ /* Don't generate logs for steady-state idle-exit kills (unless overridden for debug) */
+ if ((priority != JETSAM_PRIORITY_IDLE) || memorystatus_idle_snapshot) {
+ post_snapshot = TRUE;
+ }
+ goto done;
+ }
+
+ if (memorystatus_available_pages <= memorystatus_available_pages_critical) {
+ /* Under pressure and unable to kill a process - panic */
+ panic("memorystatus_jetsam_thread: no victim! available pages:%d\n", memorystatus_available_pages);
+ }
+
+done:
+
+ /*
+ * We do not want to over-kill when thrashing has been detected.
+ * To avoid that, we reset the flag here and notify the
+ * compressor.
+ */
+ if (is_thrashing(kill_under_pressure_cause)) {
+ kill_under_pressure_cause = 0;
+ vm_thrashing_jetsam_done();
+ }
+ }
+
+ kill_under_pressure_cause = 0;
+
+ if (errors) {
+ memorystatus_clear_errors();
+ }
+
+#if VM_PRESSURE_EVENTS
+ /*
+ * 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) {
+ 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));
+ }
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_SCAN) | DBG_FUNC_END,
+ memorystatus_available_pages, 0, 0, 0, 0);
+
+#else /* CONFIG_JETSAM */
+
+ /*
+ * Jetsam not enabled
+ */
+
+#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) {
+ return(kill_idle_exit_proc());
+}
+#endif /* !CONFIG_JETSAM */
+
+#if CONFIG_JETSAM
+
+/*
+ * Callback invoked when allowable physical memory footprint exceeded
+ * (dirty pages + IOKit mappings)
+ *
+ * This is invoked for both advisory, non-fatal per-task high watermarks,
+ * as well as the fatal task memory limits.
+ */
+void
+memorystatus_on_ledger_footprint_exceeded(boolean_t warning, const int max_footprint_mb)
+{
+ proc_t p = current_proc();
+
+ if (warning == FALSE) {
+ printf("process %d (%s) exceeded physical memory footprint limit of %d MB\n",
+ p->p_pid, p->p_comm, max_footprint_mb);
+ }
+
+#if VM_PRESSURE_EVENTS
+ if (warning == TRUE) {
+ if (memorystatus_warn_process(p->p_pid, TRUE /* critical? */) != 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, or no handler registered?).\n");
+ }
+ return;
+ }
+#endif /* VM_PRESSURE_EVENTS */
+
+ if ((p->p_memstat_state & P_MEMSTAT_FATAL_MEMLIMIT) == P_MEMSTAT_FATAL_MEMLIMIT) {
+ /*
+ * 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) {
+ 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;
+ }
+}
+
+/*
+ * 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();
+
+ printf("task_exceeded_cpulimit: killing pid %d [%s]\n",
+ p->p_pid, (p->p_comm ? p->p_comm : "(unknown)"));
+
+ retval = jetsam_do_kill(p, jetsam_flags);
+
+ if (retval) {
+ printf("task_exceeded_cpulimit: failed to kill current task (exiting?).\n");
+ }
+}
+
+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);
+
+ *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);
+ }
+ if (max_footprint_lifetime) {
+ *max_footprint_lifetime = (uint32_t)(get_task_resident_max(task) / PAGE_SIZE_64);
+ }
+ if (purgeable_pages) {
+ *purgeable_pages = (uint32_t)(get_task_purgeable_size(task) / PAGE_SIZE_64);
+ }
+}
+
+
+static void
+memorystatus_update_snapshot_locked(proc_t p, uint32_t kill_cause)
+{
+ unsigned int i;
+
+ 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;
+ }
+ memorystatus_jetsam_snapshot_list[i].killed = kill_cause;
+ 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) {
+ return;
+ }
+
+ critical = (pages_avail < memorystatus_available_pages_critical) ? TRUE : FALSE;
+ delta = ((pages_avail >= (memorystatus_available_pages + memorystatus_delta))
+ || (memorystatus_available_pages >= (pages_avail + memorystatus_delta))) ? TRUE : FALSE;
+
+ if (critical || delta) {
+ memorystatus_level = memorystatus_available_pages * 100 / atop_64(max_mem);
+ 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)
+{
+ clock_sec_t tv_sec;
+ clock_usec_t tv_usec;
+
+ memset(entry, 0, sizeof(memorystatus_jetsam_snapshot_entry_t));
+
+ entry->pid = p->p_pid;
+ strlcpy(&entry->name[0], p->p_comm, MAXCOMLEN+1);
+ entry->priority = p->p_memstat_effectivepriority;
+ memorystatus_get_task_page_counts(p->task, &entry->pages, &entry->max_pages, &entry->max_pages_lifetime, &entry->purgeable_pages);
+ 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;
+
+ return TRUE;
+}
+
+static void
+memorystatus_jetsam_snapshot_procs_locked(void)
+{
+ 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));
+ } 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;
+ }
+
+ 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])) {
+ continue;
+ }
+
+ MEMORYSTATUS_DEBUG(0, "jetsam snapshot pid = %d, uuid = %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n",
+ p->p_pid,
+ p->p_uuid[0], p->p_uuid[1], p->p_uuid[2], p->p_uuid[3], p->p_uuid[4], p->p_uuid[5], p->p_uuid[6], p->p_uuid[7],
+ p->p_uuid[8], p->p_uuid[9], p->p_uuid[10], p->p_uuid[11], p->p_uuid[12], p->p_uuid[13], p->p_uuid[14], p->p_uuid[15]);
+
+ if (++i == memorystatus_jetsam_snapshot_max) {
+ break;
+ }
+ }
+
+ memorystatus_jetsam_snapshot->snapshot_time = mach_absolute_time();
+ memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = i;
+}
+
+#if DEVELOPMENT || DEBUG
+
+static int
+memorystatus_cmd_set_panic_bits(user_addr_t buffer, uint32_t buffer_size) {
+ int ret;
+ memorystatus_jetsam_panic_options_t debug;
+
+ if (buffer_size != sizeof(memorystatus_jetsam_panic_options_t)) {
+ return EINVAL;
+ }
+
+ ret = copyin(buffer, &debug, buffer_size);
+ if (ret) {
+ return ret;
+ }
+
+ /* Panic bits match kMemorystatusKilled* enum */
+ memorystatus_jetsam_panic_debug = (memorystatus_jetsam_panic_debug & ~debug.mask) | (debug.data & debug.mask);
+
+ /* Copyout new value */
+ debug.data = memorystatus_jetsam_panic_debug;
+ ret = copyout(&debug, buffer, sizeof(memorystatus_jetsam_panic_options_t));
+
+ return ret;
+}
+
+#endif
+
+/*
+ * Jetsam a specific process.
+ */
+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;
+ }
+
+ printf("memorystatus: specifically killing pid %d [%s] (%s) - memorystatus_available_pages: %d\n",
+ victim_pid, (p->p_comm ? p->p_comm : "(unknown)"),
+ jetsam_kill_cause_name[cause], memorystatus_available_pages);
+
+ proc_list_lock();
+
+ if (memorystatus_jetsam_snapshot_count == 0) {
+ memorystatus_jetsam_snapshot_procs_locked();
+ }
+
+ memorystatus_update_snapshot_locked(p, cause);
+ proc_list_unlock();
+
+ killed = memorystatus_do_kill(p, cause);
+ proc_rele(p);
+
+ return killed;
+}
+
+/*
+ * 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)
+{
+ pid_t aPid;
+ proc_t p = PROC_NULL, next_p = PROC_NULL;
+ boolean_t new_snapshot = FALSE, killed = FALSE;
+ unsigned int i = 0;
+
+#ifndef CONFIG_FREEZE
+#pragma unused(any)
+#endif
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM) | DBG_FUNC_START,
+ memorystatus_available_pages, 0, 0, 0, 0);
+
+ proc_list_lock();
+
+ memorystatus_sort_by_largest_process_locked(JETSAM_PRIORITY_FOREGROUND);
+
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ while (next_p) {
+#if DEVELOPMENT || DEBUG
+ int activeProcess;
+ int procSuspendedForDiagnosis;
+#endif /* DEVELOPMENT || DEBUG */
+
+ p = next_p;
+ next_p = memorystatus_get_next_proc_locked(&i, p, TRUE);
+
+#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;
+
+ 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 */
+
+ 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));
+ if (any || reclaim_proc) {
+ skip = FALSE;
+ } else {
+ skip = TRUE;
+ }
+
+ if (skip) {
+ continue;
+ } 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) &&
+ (memorystatus_idle_snapshot || ((!priority) || (priority && (*priority != JETSAM_PRIORITY_IDLE))))) {
+ memorystatus_jetsam_snapshot_procs_locked();
+ 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;
+
+#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);
+ p->p_memstat_state |= P_MEMSTAT_DIAG_SUSPENDED;
+ if (memorystatus_jetsam_policy & kPolicyDiagnoseFirst) {
+ jetsam_diagnostic_suspended_one_active_proc = 1;
+ printf("jetsam: returning after suspending first active proc - %d\n", aPid);
+ }
+
+ p = proc_ref_locked(p);
+ proc_list_unlock();
+ if (p) {
+ task_suspend(p->task);
+ proc_rele(p);
+ killed = TRUE;
+ }
+
+ goto exit;
+ } else
+#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: %s %d [%s] (%s) - memorystatus_available_pages: %d\n",
+ ((p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE) ?
+ "idle exiting pid" : "jetsam killing pid"),
+ aPid, (p->p_comm ? p->p_comm : "(unknown)"),
+ jetsam_kill_cause_name[cause], memorystatus_available_pages);
+ killed = memorystatus_do_kill(p, cause);
+ }
+
+ /* Success? */
+ if (killed) {
+ proc_rele(p);
+ goto exit;
+ }
+
+ /* 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;
+ i = 0;
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ }
+ }
+ }
+
+ proc_list_unlock();
+
+exit:
+ /* Clear snapshot if freshly captured and no target was found */
+ if (new_snapshot && !killed) {
+ 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, 0, 0, 0);
+
+ return killed;
+}
+
+#if LEGACY_HIWATER
+
+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;
+ unsigned int i = 0;
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM_HIWAT) | DBG_FUNC_START,
+ memorystatus_available_pages, 0, 0, 0, 0);
+
+ proc_list_lock();
+ memorystatus_sort_by_largest_process_locked(JETSAM_PRIORITY_FOREGROUND);
+
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ while (next_p) {
+ uint32_t footprint;
+ boolean_t skip;
+
+ p = next_p;
+ next_p = memorystatus_get_next_proc_locked(&i, p, TRUE);
+
+ aPid = p->p_pid;
+
+ if (p->p_memstat_state & (P_MEMSTAT_ERROR | P_MEMSTAT_TERMINATED)) {
+ continue;
+ }
+
+ /* skip if no limit set */
+ if (p->p_memstat_memlimit <= 0) {
+ continue;
+ }
+
+ /* 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;
+ }
+
+ 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) {
+ continue;
+ }
+ }
+#endif /* DEVELOPMENT || DEBUG */
+
+#if CONFIG_FREEZE
+ if (!skip) {
+ if (p->p_memstat_state & P_MEMSTAT_LOCKED) {
+ skip = TRUE;
+ } else {
+ skip = FALSE;
+ }
+ }
+#endif
+
+ if (skip) {
+ continue;
+ } else {
+ MEMORYSTATUS_DEBUG(1, "jetsam: %s pid %d [%s] - %d Mb > 1 (%d Mb)\n",
+ (memorystatus_jetsam_policy & kPolicyDiagnoseActive) ? "suspending": "killing", aPid, p->p_comm, footprint, p->p_memstat_memlimit);
+
+ if (memorystatus_jetsam_snapshot_count == 0) {
+ memorystatus_jetsam_snapshot_procs_locked();
+ new_snapshot = TRUE;
+ }
+
+ p->p_memstat_state |= P_MEMSTAT_TERMINATED;
+
+#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);
+ p->p_memstat_state |= P_MEMSTAT_DIAG_SUSPENDED;
+
+ p = proc_ref_locked(p);
+ proc_list_unlock();
+ if (p) {
+ task_suspend(p->task);
+ proc_rele(p);
+ killed = TRUE;
+ }
+
+ goto exit;
+ } else
+#endif /* DEVELOPMENT || DEBUG */
+ {
+ memorystatus_update_snapshot_locked(p, kMemorystatusKilledHiwat);
+
+ 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;
+ }
+
+ /* 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;
+ i = 0;
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ }
+ }
+ }
+
+ proc_list_unlock();
+
+exit:
+ /* Clear snapshot if freshly captured and no target was found */
+ if (new_snapshot && !killed) {
+ memorystatus_jetsam_snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
+ }
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_JETSAM_HIWAT) | DBG_FUNC_END,
+ memorystatus_available_pages, killed ? aPid : 0, 0, 0, 0);
+
+ return killed;
+}
+
+#endif /* LEGACY_HIWATER */
+
+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 &&
+ cause != kMemorystatusKilledFCThrashing)) {
+ return FALSE;
+ }
+
+ 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);
+ }
+}
+
+boolean_t
+memorystatus_kill_on_VM_thrashing(boolean_t async) {
+ if (async) {
+ return memorystatus_kill_process_async(-1, kMemorystatusKilledVMThrashing);
+ } else {
+ return memorystatus_kill_process_sync(-1, kMemorystatusKilledVMThrashing);
+ }
+}
+
+boolean_t
+memorystatus_kill_on_FC_thrashing(boolean_t async) {
+ if (async) {
+ return memorystatus_kill_process_async(-1, kMemorystatusKilledFCThrashing);
+ } else {
+ return memorystatus_kill_process_sync(-1, kMemorystatusKilledFCThrashing);
+ }
+}
+
+boolean_t
+memorystatus_kill_on_vnode_limit(void) {
+ return memorystatus_kill_process_sync(-1, kMemorystatusKilledVnodes);
+}
+
+#endif /* CONFIG_JETSAM */
+
+#if CONFIG_FREEZE
+
+__private_extern__ void
+memorystatus_freeze_init(void)
+{
+ kern_return_t result;
+ thread_t thread;
+
+ result = kernel_thread_start(memorystatus_freeze_thread, NULL, &thread);
+ if (result == KERN_SUCCESS) {
+ thread_deallocate(thread);
+ } else {
+ panic("Could not create memorystatus_freeze_thread");
+ }
+}
+
+static int
+memorystatus_freeze_top_process(boolean_t *memorystatus_freeze_swap_low)
+{
+ pid_t aPid = 0;
+ int ret = -1;
+ proc_t p = PROC_NULL, next_p = PROC_NULL;
+ unsigned int i = 0;
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_FREEZE) | DBG_FUNC_START,
+ memorystatus_available_pages, 0, 0, 0, 0);
+
+ proc_list_lock();
+
+ next_p = memorystatus_get_first_proc_locked(&i, TRUE);
+ while (next_p) {
+ kern_return_t kr;
+ uint32_t purgeable, wired, clean, dirty;
+ boolean_t shared;
+ uint32_t pages;
+ uint32_t max_pages = 0;
+ uint32_t state;
+
+ p = next_p;
+ next_p = memorystatus_get_next_proc_locked(&i, p, TRUE);
+
+ 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)) {
+ continue; // with lock held
+ }
+
+ /* 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) {
+ continue; // with lock held
+ }
+
+ if (DEFAULT_FREEZER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_SWAPBACKED) {
+ /* Ensure there's enough free space to freeze this process. */
+ max_pages = MIN(default_pager_swap_pages_free(), memorystatus_freeze_pages_max);
+ if (max_pages < memorystatus_freeze_pages_min) {
+ *memorystatus_freeze_swap_low = TRUE;
+ proc_list_unlock();
+ goto exit;
+ }
+ } else {
+ max_pages = UINT32_MAX - 1;
+ }
+
+ /* Mark as locked temporarily to avoid kill */
+ p->p_memstat_state |= P_MEMSTAT_LOCKED;
+
+ p = proc_ref_locked(p);
+ proc_list_unlock();
+ if (!p) {
+ goto exit;
+ }
+
+ 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());
+
+ proc_list_lock();
+ p->p_memstat_state &= ~P_MEMSTAT_LOCKED;
+
+ /* Success? */
+ if (KERN_SUCCESS == kr) {
+ memorystatus_freeze_entry_t data = { aPid, TRUE, dirty };
+
+ 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;
+ }
+
+ memorystatus_freeze_pageouts += dirty;
+ memorystatus_freeze_count++;
+
+ proc_list_unlock();
+
+ memorystatus_send_note(kMemorystatusFreezeNote, &data, sizeof(data));
+
+ /* Return the number of reclaimed pages */
+ ret = dirty;
+
+ } else {
+ proc_list_unlock();
+ }
+
+ proc_rele(p);
+ goto exit;
+ }
+
+ proc_list_unlock();
+
+exit:
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_FREEZE) | DBG_FUNC_END,
+ memorystatus_available_pages, aPid, 0, 0, 0);
+
+ return ret;
+}
+
+static inline boolean_t
+memorystatus_can_freeze_processes(void)
+{
+ boolean_t ret;
+
+ proc_list_lock();
+
+ if (memorystatus_suspended_count) {
+ uint32_t average_resident_pages, estimated_processes;
+
+ /* Estimate the number of suspended processes we can fit */
+ average_resident_pages = memorystatus_suspended_footprint_total / memorystatus_suspended_count;
+ estimated_processes = memorystatus_suspended_count +
+ ((memorystatus_available_pages - memorystatus_available_pages_critical) / average_resident_pages);
+
+ /* If it's predicted that no freeze will occur, lower the threshold temporarily */
+ if (estimated_processes <= FREEZE_SUSPENDED_THRESHOLD_DEFAULT) {
+ memorystatus_freeze_suspended_threshold = FREEZE_SUSPENDED_THRESHOLD_LOW;
+ } else {
+ memorystatus_freeze_suspended_threshold = FREEZE_SUSPENDED_THRESHOLD_DEFAULT;
+ }
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_can_freeze_processes: %d suspended processes, %d average resident pages / process, %d suspended processes estimated\n",
+ memorystatus_suspended_count, average_resident_pages, estimated_processes);
+
+ if ((memorystatus_suspended_count - memorystatus_frozen_count) > memorystatus_freeze_suspended_threshold) {
+ ret = TRUE;
+ } else {
+ ret = FALSE;
+ }
+ } else {
+ ret = FALSE;
+ }
+
+ proc_list_unlock();
+
+ return ret;
+}
+
+static boolean_t
+memorystatus_can_freeze(boolean_t *memorystatus_freeze_swap_low)
+{
+ /* Only freeze if we're sufficiently low on memory; this holds off freeze right
+ after boot, and is generally is a no-op once we've reached steady state. */
+ if (memorystatus_available_pages > memorystatus_freeze_threshold) {
+ return FALSE;
+ }
+
+ /* Check minimum suspended process threshold. */
+ if (!memorystatus_can_freeze_processes()) {
+ return FALSE;
+ }
+
+ /* 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;
+ }
+
+ /* Pages have been freed - we can retry. */
+ *memorystatus_freeze_swap_low = FALSE;
+ }
+
+ /* OK */
+ return TRUE;
+}
+
+static void
+memorystatus_freeze_update_throttle_interval(mach_timespec_t *ts, struct throttle_interval_t *interval)
+{
+ 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)));
+ } else {
+ printf("memorystatus_freeze_update_throttle_interval: %d minute throttle timeout, resetting\n", interval->mins);
+ }
+ interval->ts.tv_sec = interval->mins * 60;
+ interval->ts.tv_nsec = 0;
+ ADD_MACH_TIMESPEC(&interval->ts, ts);
+ /* Since we update the throttle stats pre-freeze, adjust for overshoot here */
+ if (interval->pageouts > interval->max_pageouts) {
+ interval->pageouts -= interval->max_pageouts;
+ } else {
+ interval->pageouts = 0;
+ }
+ interval->throttle = FALSE;
+ } else if (!interval->throttle && interval->pageouts >= interval->max_pageouts) {
+ printf("memorystatus_freeze_update_throttle_interval: %d minute pageout limit exceeded; enabling throttle\n", interval->mins);
+ interval->throttle = TRUE;
+ }
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_freeze_update_throttle_interval: throttle updated - %d frozen (%d max) within %dm; %dm remaining; throttle %s\n",
+ interval->pageouts, interval->max_pageouts, interval->mins, (interval->ts.tv_sec - ts->tv_sec) / 60,
+ interval->throttle ? "on" : "off");
+}
+
+static boolean_t
+memorystatus_freeze_update_throttle(void)
+{
+ clock_sec_t sec;
+ clock_nsec_t nsec;
+ mach_timespec_t ts;
+ uint32_t i;
+ boolean_t throttled = FALSE;
+
+#if DEVELOPMENT || DEBUG
+ if (!memorystatus_freeze_throttle_enabled)
+ return FALSE;
+#endif
+
+ clock_get_system_nanotime(&sec, &nsec);
+ ts.tv_sec = sec;
+ ts.tv_nsec = nsec;
+
+ /* Check freeze pageouts over multiple intervals and throttle if we've exceeded our budget.
+ *
+ * This ensures that periods of inactivity can't be used as 'credit' towards freeze if the device has
+ * remained dormant for a long period. We do, however, allow increased thresholds for shorter intervals in
+ * order to allow for bursts of activity.
+ */
+ for (i = 0; i < sizeof(throttle_intervals) / sizeof(struct throttle_interval_t); i++) {
+ memorystatus_freeze_update_throttle_interval(&ts, &throttle_intervals[i]);
+ if (throttle_intervals[i].throttle == TRUE)
+ throttled = TRUE;
+ }
+
+ return throttled;
+}
+
+static void
+memorystatus_freeze_thread(void *param __unused, wait_result_t wr __unused)
+{
+ static boolean_t memorystatus_freeze_swap_low = FALSE;
+
+ if (memorystatus_freeze_enabled) {
+ if (memorystatus_can_freeze(&memorystatus_freeze_swap_low)) {
+ /* Only freeze if we've not exceeded our pageout budgets or we're not backed by swap. */
+ if (DEFAULT_FREEZER_COMPRESSED_PAGER_IS_SWAPLESS ||
+ !memorystatus_freeze_update_throttle()) {
+ memorystatus_freeze_top_process(&memorystatus_freeze_swap_low);
+ } else {
+ printf("memorystatus_freeze_thread: in throttle, ignoring freeze\n");
+ memorystatus_freeze_throttle_count++; /* Throttled, update stats */
+ }
+ }
+ }
+
+ assert_wait((event_t) &memorystatus_freeze_wakeup, THREAD_UNINT);
+ thread_block((thread_continue_t) memorystatus_freeze_thread);
+}
+
+#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 ret;
+}
+
+boolean_t
+memorystatus_warn_process(pid_t pid, boolean_t critical) {
+
+ boolean_t ret = FALSE;
+ struct knote *kn = NULL;
+
+ /*
+ * See comment in sysctl_memorystatus_vm_pressure_send.
+ */
+
+ memorystatus_klist_lock();
+ kn = vm_find_knote_from_pid(pid, &memorystatus_klist);
+ if (kn) {
+ /*
+ * 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 (critical) {
+ kn->kn_fflags |= NOTE_MEMORYSTATUS_PRESSURE_CRITICAL;
+ } else {
+ kn->kn_fflags |= NOTE_MEMORYSTATUS_PRESSURE_WARN;
+ }
+ KNOTE(&memorystatus_klist, kMemorystatusPressure);
+ ret = TRUE;
+ } else {
+ if (vm_dispatch_pressure_note_to_pid(pid, FALSE) == 0) {
+ ret = TRUE;
+ }
+ }
+ memorystatus_klist_unlock();
+
+ return ret;
+}
+
+int
+memorystatus_send_pressure_note(pid_t pid) {
+ MEMORYSTATUS_DEBUG(1, "memorystatus_send_pressure_note(): pid %d\n", pid);
+ return memorystatus_send_note(kMemorystatusPressureNote, &pid, sizeof(pid));
+}
+
+void
+memorystatus_send_low_swap_note(void) {
+
+ struct knote *kn = NULL;
+
+ memorystatus_klist_lock();
+ SLIST_FOREACH(kn, &memorystatus_klist, kn_selnext) {
+ if (is_knote_registered_modify_task_pressure_bits(kn, NOTE_MEMORYSTATUS_LOW_SWAP, NULL, 0, 0) == TRUE) {
+ KNOTE(&memorystatus_klist, kMemorystatusLowSwap);
+ }
+ }
+ memorystatus_klist_unlock();
+}
+
+boolean_t
+memorystatus_bg_pressure_eligible(proc_t p) {
+ boolean_t eligible = FALSE;
+
+ proc_list_lock();
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_bg_pressure_eligible: pid %d, state 0x%x\n", p->p_pid, p->p_memstat_state);
+
+ /* Foreground processes have already been dealt with at this point, so just test for eligibility */
+ if (!(p->p_memstat_state & (P_MEMSTAT_TERMINATED | P_MEMSTAT_LOCKED | P_MEMSTAT_SUSPENDED | P_MEMSTAT_FROZEN))) {
+ eligible = TRUE;
+ }
+
+ proc_list_unlock();
+
+ return eligible;
+}
+
+boolean_t
+memorystatus_is_foreground_locked(proc_t p) {
+ return ((p->p_memstat_effectivepriority == JETSAM_PRIORITY_FOREGROUND) ||
+ (p->p_memstat_effectivepriority == JETSAM_PRIORITY_FOREGROUND_SUPPORT));
+}
+#endif /* CONFIG_MEMORYSTATUS */
+
+/*
+ * Trigger levels to test the mechanism.
+ * Can be used via a sysctl.
+ */
+#define TEST_LOW_MEMORY_TRIGGER_ONE 1
+#define TEST_LOW_MEMORY_TRIGGER_ALL 2
+#define TEST_PURGEABLE_TRIGGER_ONE 3
+#define TEST_PURGEABLE_TRIGGER_ALL 4
+#define TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ONE 5
+#define TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL 6
+
+boolean_t memorystatus_manual_testing_on = FALSE;
+vm_pressure_level_t memorystatus_manual_testing_level = kVMPressureNormal;
+
+extern struct knote *
+vm_pressure_select_optimal_candidate_to_notify(struct klist *, int, boolean_t);
+
+extern
+kern_return_t vm_pressure_notification_without_levels(boolean_t);
+
+extern void vm_pressure_klist_lock(void);
+extern void vm_pressure_klist_unlock(void);
+
+extern void vm_reset_active_list(void);
+
+extern void delay(int);
+
+#define INTER_NOTIFICATION_DELAY (250000) /* .25 second */
+
+void memorystatus_on_pageout_scan_end(void) {
+ /* No-op */
+}
+
+/*
+ * kn_max - knote
+ *
+ * knote_pressure_level - to check if the knote is registered for this notification level.
+ *
+ * task - task whose bits we'll be modifying
+ *
+ * pressure_level_to_clear - if the task has been notified of this past level, clear that notification bit so that if/when we revert to that level, the task will be notified again.
+ *
+ * pressure_level_to_set - the task is about to be notified of this new level. Update the task's bit notification information appropriately.
+ *
+ */
+
+boolean_t
+is_knote_registered_modify_task_pressure_bits(struct knote *kn_max, int knote_pressure_level, task_t task, vm_pressure_level_t pressure_level_to_clear, vm_pressure_level_t pressure_level_to_set)
+{
+ if (kn_max->kn_sfflags & knote_pressure_level) {
+
+ if (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;
+}
+
+extern kern_return_t vm_pressure_notify_dispatch_vm_clients(boolean_t target_foreground_process);
+
+#define VM_PRESSURE_DECREASED_SMOOTHING_PERIOD 5000 /* milliseconds */
+
+kern_return_t
+memorystatus_update_vm_pressure(boolean_t target_foreground_process)
+{
+ struct knote *kn_max = NULL;
+ pid_t target_pid = -1;
+ struct klist dispatch_klist = { NULL };
+ proc_t target_proc = PROC_NULL;
+ struct task *task = NULL;
+ boolean_t found_candidate = FALSE;
+
+ static vm_pressure_level_t level_snapshot = kVMPressureNormal;
+ static vm_pressure_level_t prev_level_snapshot = kVMPressureNormal;
+ boolean_t smoothing_window_started = FALSE;
+ struct timeval smoothing_window_start_tstamp = {0, 0};
+ struct timeval curr_tstamp = {0, 0};
+ int elapsed_msecs = 0;
+
+#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++;
+ delay(1000000); /* 1 second */
+ }
+#endif /* !CONFIG_JETSAM */
+
+ while (1) {
+
+ /*
+ * There is a race window here. But it's not clear
+ * how much we benefit from having extra synchronization.
+ */
+ level_snapshot = memorystatus_vm_pressure_level;
+
+ if (prev_level_snapshot > level_snapshot) {
+ /*
+ * Pressure decreased? Let's take a little breather
+ * and see if this condition stays.
+ */
+ if (smoothing_window_started == FALSE) {
+
+ smoothing_window_started = TRUE;
+ microuptime(&smoothing_window_start_tstamp);
+ }
+
+ microuptime(&curr_tstamp);
+ timevalsub(&curr_tstamp, &smoothing_window_start_tstamp);
+ elapsed_msecs = curr_tstamp.tv_sec * 1000 + curr_tstamp.tv_usec / 1000;
+
+ if (elapsed_msecs < VM_PRESSURE_DECREASED_SMOOTHING_PERIOD) {
+
+ delay(INTER_NOTIFICATION_DELAY);
+ continue;
+ }
+ }
+
+ 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, 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.
+ *
+ */
+
+ if (level_snapshot != kVMPressureNormal) {
+ goto try_dispatch_vm_clients;
+ } else {
+ return KERN_FAILURE;
+ }
+ }
+
+ target_proc = kn_max->kn_kq->kq_p;
+
+ proc_list_lock();
+ if (target_proc != proc_ref_locked(target_proc)) {
+ target_proc = PROC_NULL;
+ proc_list_unlock();
+ memorystatus_klist_unlock();
+ continue;
+ }
+ proc_list_unlock();
+ memorystatus_klist_unlock();
+
+ target_pid = target_proc->p_pid;
+
+ task = (struct task *)(target_proc->task);
+
+ if (level_snapshot != kVMPressureNormal) {
+
+ if (level_snapshot == kVMPressureWarning || level_snapshot == kVMPressureUrgent) {
+
+ if (is_knote_registered_modify_task_pressure_bits(kn_max, NOTE_MEMORYSTATUS_PRESSURE_WARN, task, kVMPressureCritical, 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) {
+ found_candidate = TRUE;
+ }
+ }
+ }
+ } else {
+ if (kn_max->kn_sfflags & NOTE_MEMORYSTATUS_PRESSURE_NORMAL) {
+
+ task_clear_has_been_notified(task, kVMPressureWarning);
+ task_clear_has_been_notified(task, kVMPressureCritical);
+
+ found_candidate = TRUE;
+ }
+ }
+
+ if (found_candidate == FALSE) {
+ continue;
+ }
+
+ memorystatus_klist_lock();
+ KNOTE_DETACH(&memorystatus_klist, kn_max);
+ KNOTE_ATTACH(&dispatch_klist, kn_max);
+ memorystatus_klist_unlock();
+
+ KNOTE(&dispatch_klist, (level_snapshot != kVMPressureNormal) ? kMemorystatusPressure : kMemorystatusNoPressure);
+
+ memorystatus_klist_lock();
+ KNOTE_DETACH(&dispatch_klist, kn_max);
+ KNOTE_ATTACH(&memorystatus_klist, kn_max);
+ memorystatus_klist_unlock();
+
+ microuptime(&target_proc->vm_pressure_last_notify_tstamp);
+ proc_rele(target_proc);
+
+ if (memorystatus_manual_testing_on == TRUE && target_foreground_process == TRUE) {
+ break;
+ }
+
+try_dispatch_vm_clients:
+ if (kn_max == NULL && level_snapshot != kVMPressureNormal) {
+ /*
+ * We will exit this loop when we are done with
+ * notification clients (level and non-level based).
+ */
+ if ((vm_pressure_notify_dispatch_vm_clients(target_foreground_process) == KERN_FAILURE) && (kn_max == NULL)) {
+ /*
+ * 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.
+ */
+
+ return KERN_FAILURE;
+ }
+ }
+
+ /*
+ * LD: This block of code below used to be invoked in the older memory notification scheme on embedded everytime
+ * a process was sent a memory pressure notification. The "memorystatus_klist" list was used to hold these
+ * privileged listeners. But now we have moved to the newer scheme and are trying to move away from the extra
+ * notifications. So the code is here in case we break compat. and need to send out notifications to the privileged
+ * apps.
+ */
+#if 0
+#endif /* 0 */
+
+ if (memorystatus_manual_testing_on == TRUE) {
+ /*
+ * Testing out the pressure notification scheme.
+ * No need for delays etc.
+ */
+ } 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 (memorystatus_available_pages <= skip_delay_page_threshold) {
+ /*
+ * We are nearing the critcal mark fast and can't afford to wait between
+ * notifications.
+ */
+ sleep_interval = 0;
+ }
+#endif /* CONFIG_JETSAM */
+
+ if (sleep_interval) {
+ delay(sleep_interval);
+ }
+ }
+ }
+
+ 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)
+{
+ vm_pressure_level_t dispatch_level = NOTE_MEMORYSTATUS_PRESSURE_NORMAL;
+
+ switch (internal_pressure_level) {
+
+ case kVMPressureNormal:
+ {
+ dispatch_level = NOTE_MEMORYSTATUS_PRESSURE_NORMAL;
+ break;
+ }
+
+ case kVMPressureWarning:
+ case kVMPressureUrgent:
+ {
+ dispatch_level = NOTE_MEMORYSTATUS_PRESSURE_WARN;
+ break;
+ }
+
+ case kVMPressureCritical:
+ {
+ dispatch_level = NOTE_MEMORYSTATUS_PRESSURE_CRITICAL;
+ break;
+ }
+
+ default:
+ break;
+ }
+
+ return dispatch_level;
+}
+
+static int
+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;
+
+static int
+sysctl_memorypressure_manual_trigger SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2)
+
+ int level = 0;
+ int error = 0;
+ int pressure_level = 0;
+ int trigger_request = 0;
+ int force_purge;
+
+ error = sysctl_handle_int(oidp, &level, 0, req);
+ if (error || !req->newptr) {
+ return (error);
+ }
+
+ memorystatus_manual_testing_on = TRUE;
+
+ trigger_request = (level >> 16) & 0xFFFF;
+ pressure_level = (level & 0xFFFF);
+
+ if (trigger_request < TEST_LOW_MEMORY_TRIGGER_ONE ||
+ trigger_request > TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL) {
+ return EINVAL;
+ }
+ switch (pressure_level) {
+ case NOTE_MEMORYSTATUS_PRESSURE_NORMAL:
+ case NOTE_MEMORYSTATUS_PRESSURE_WARN:
+ case NOTE_MEMORYSTATUS_PRESSURE_CRITICAL:
+ break;
+ default:
+ return EINVAL;
+ }
+
+ /*
+ * The pressure level is being set from user-space.
+ * And user-space uses the constants in sys/event.h
+ * So we translate those events to our internal levels here.
+ */
+ if (pressure_level == NOTE_MEMORYSTATUS_PRESSURE_NORMAL) {
+
+ memorystatus_manual_testing_level = kVMPressureNormal;
+ force_purge = 0;
+
+ } else if (pressure_level == NOTE_MEMORYSTATUS_PRESSURE_WARN) {
+
+ memorystatus_manual_testing_level = kVMPressureWarning;
+ force_purge = memorystatus_purge_on_warning;
+
+ } else if (pressure_level == NOTE_MEMORYSTATUS_PRESSURE_CRITICAL) {
+
+ memorystatus_manual_testing_level = kVMPressureCritical;
+ force_purge = memorystatus_purge_on_critical;
+ }
+
+ memorystatus_vm_pressure_level = memorystatus_manual_testing_level;
+
+ /* purge according to the new pressure level */
+ switch (trigger_request) {
+ case TEST_PURGEABLE_TRIGGER_ONE:
+ case TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ONE:
+ if (force_purge == 0) {
+ /* no purging requested */
+ break;
+ }
+ vm_purgeable_object_purge_one_unlocked(force_purge);
+ break;
+ case TEST_PURGEABLE_TRIGGER_ALL:
+ case TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL:
+ if (force_purge == 0) {
+ /* no purging requested */
+ break;
+ }
+ while (vm_purgeable_object_purge_one_unlocked(force_purge));
+ break;
+ }
+
+ if ((trigger_request == TEST_LOW_MEMORY_TRIGGER_ONE) ||
+ (trigger_request == TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ONE)) {
+
+ memorystatus_update_vm_pressure(TRUE);
+ }
+
+ if ((trigger_request == TEST_LOW_MEMORY_TRIGGER_ALL) ||
+ (trigger_request == TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL)) {
+
+ while (memorystatus_update_vm_pressure(FALSE) == KERN_SUCCESS) {
+ continue;
+ }
+ }
+
+ 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(FALSE);
+ vm_pressure_klist_unlock();
+ }
+
+ return 0;
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, memorypressure_manual_trigger, CTLTYPE_INT|CTLFLAG_WR|CTLFLAG_LOCKED|CTLFLAG_MASKED,
+ 0, 0, &sysctl_memorypressure_manual_trigger, "I", "");
+
+
+extern int memorystatus_purge_on_warning;
+extern int memorystatus_purge_on_urgent;
+extern int memorystatus_purge_on_critical;
+
+SYSCTL_INT(_kern, OID_AUTO, memorystatus_purge_on_warning, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_purge_on_warning, 0, "");
+SYSCTL_INT(_kern, OID_AUTO, memorystatus_purge_on_urgent, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_purge_on_urgent, 0, "");
+SYSCTL_INT(_kern, OID_AUTO, memorystatus_purge_on_critical, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_purge_on_critical, 0, "");
+
+
+#endif /* VM_PRESSURE_EVENTS */
+
+/* Return both allocated and actual size, since there's a race between allocation and list compilation */
+static int
+memorystatus_get_priority_list(memorystatus_priority_entry_t **list_ptr, size_t *buffer_size, size_t *list_size, boolean_t size_only)
+{
+ uint32_t list_count, i = 0;
+ memorystatus_priority_entry_t *list_entry;
+ proc_t p;
+
+ list_count = memorystatus_list_count;
+ *list_size = sizeof(memorystatus_priority_entry_t) * list_count;
+
+ /* Just a size check? */
+ if (size_only) {
+ return 0;
+ }
+
+ /* Otherwise, validate the size of the buffer */
+ if (*buffer_size < *list_size) {
+ return EINVAL;
+ }
+
+ *list_ptr = (memorystatus_priority_entry_t*)kalloc(*list_size);
+ if (!list_ptr) {
+ return ENOMEM;
+ }
+
+ memset(*list_ptr, 0, *list_size);
+
+ *buffer_size = *list_size;
+ *list_size = 0;
+
+ list_entry = *list_ptr;
+
+ proc_list_lock();
+
+ p = memorystatus_get_first_proc_locked(&i, TRUE);
+ while (p && (*list_size < *buffer_size)) {
+ 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
+ list_entry->state = memorystatus_build_state(p);
+ list_entry++;
+
+ *list_size += sizeof(memorystatus_priority_entry_t);
+
+ p = memorystatus_get_next_proc_locked(&i, p, TRUE);
+ }
+
+ proc_list_unlock();
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_get_priority_list: returning %lu for size\n", (unsigned long)*list_size);
+
+ return 0;
+}
+
+static int
+memorystatus_cmd_get_priority_list(user_addr_t buffer, size_t buffer_size, int32_t *retval) {
+ int error = EINVAL;
+ boolean_t size_only;
+ memorystatus_priority_entry_t *list = NULL;
+ size_t list_size;
+
+ size_only = ((buffer == USER_ADDR_NULL) ? TRUE: FALSE);
+
+ error = memorystatus_get_priority_list(&list, &buffer_size, &list_size, size_only);
+ if (error) {
+ goto out;
+ }
+
+ if (!size_only) {
+ error = copyout(list, buffer, list_size);
+ }
+
+ if (error == 0) {
+ *retval = list_size;
+ }
+out:
+
+ if (list) {
+ kfree(list, buffer_size);
+ }
+
+ return error;
+}
+
+#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 (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
+memorystatus_get_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_size = 0;
+ }
+
+ if (size_only) {
+ return 0;
+ }
+
+ if (input_size < *snapshot_size) {
+ return EINVAL;
+ }
+
+ *snapshot = memorystatus_jetsam_snapshot;
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_snapshot: returning %ld for size\n", (long)*snapshot_size);
+
+ return 0;
+}
+
+
+static int
+memorystatus_cmd_get_jetsam_snapshot(user_addr_t buffer, size_t buffer_size, int32_t *retval) {
+ int error = EINVAL;
+ boolean_t size_only;
+ memorystatus_jetsam_snapshot_t *snapshot;
+
+ size_only = ((buffer == USER_ADDR_NULL) ? TRUE : FALSE);
+
+ error = memorystatus_get_snapshot(&snapshot, &buffer_size, size_only);
+ if (error) {
+ goto out;
+ }
+
+ /* Copy out and reset */
+ if (!size_only) {
+ if ((error = copyout(snapshot, buffer, buffer_size)) == 0) {
+ snapshot->entry_count = memorystatus_jetsam_snapshot_count = 0;
+ }
+ }
+
+ if (error == 0) {
+ *retval = buffer_size;
+ }
+out:
+ 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_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;
+
+ 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 == JETSAM_PRIORITY_IDLE_DEFERRED) {
+ /* JETSAM_PRIORITY_IDLE_DEFERRED is 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;
+
+ 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 the
+ * JETSAM_PRIORITY_IDLE_DEFERRED band.
+ */
+ if (p->p_memstat_effectivepriority == JETSAM_PRIORITY_IDLE_DEFERRED) {
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ }
+
+ memorystatus_update_priority_locked(p, new_priority, head_insert);
+ }
+
+ 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 meant solely for the purpose of adjusting jetsam priorities and bands.
+ * It is _not_ meant to be used for the setting of memory limits, especially, since we can't
+ * tell if the memory limit being set is fatal or not.
+ *
+ * So the the last 5 args to the memorystatus_update() call below, related to memory limits, are all 0 or FALSE.
+ */
+
+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 */
+
+ int error;
+ uint32_t i;
+ uint32_t entry_count;
+ memorystatus_priority_properties_t *entries;
+
+ /* Validate inputs */
+ if ((pid == 0) || (buffer == USER_ADDR_NULL) || (buffer_size == 0)) {
+ return EINVAL;
+ }
+
+ /* 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)) {
+ return EINVAL;
+ }
+
+ entries = (memorystatus_priority_properties_t *)kalloc(buffer_size);
+
+ error = copyin(buffer, entries, buffer_size);
+
+ for (i = 0; i < entry_count; i++) {
+ proc_t p;
+
+ if (error) {
+ break;
+ }
+
+ p = proc_find(pid);
+ if (!p) {
+ error = ESRCH;
+ break;
+ }
+
+ if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
+ error = EPERM;
+ proc_rele(p);
+ break;
+ }
+
+ error = memorystatus_update(p, entries[i].priority, entries[i].user_data, FALSE, FALSE, 0, 0, FALSE);
+ proc_rele(p);
+ }
+
+ kfree(entries, buffer_size);
+
+ return error;
+}
+
+static int
+memorystatus_cmd_get_pressure_status(int32_t *retval) {
+ int error;
+
+ /* Need privilege for check */
+ error = priv_check_cred(kauth_cred_get(), PRIV_VM_PRESSURE, 0);
+ if (error) {
+ return (error);
+ }
+
+ /* Inherently racy, so it's not worth taking a lock here */
+ *retval = (kVMPressureNormal != memorystatus_vm_pressure_level) ? 1 : 0;
+
+ return error;
+}
+
+/*
+ * Every process, including a P_MEMSTAT_INTERNAL process (currently only pid 1), is allowed to set a HWM.
+ */
+
+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) {
+ int error = 0;
+
+ proc_t p = proc_find(pid);
+ if (!p) {
+ return ESRCH;
+ }
+
+ if (high_water_mark <= 0) {
+ high_water_mark = -1; /* Disable */
+ }
+
+ proc_list_lock();
+
+ p->p_memstat_memlimit = high_water_mark;
+ if (memorystatus_highwater_enabled) {
+ if (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_BACKGROUND) {
+
+ memorystatus_update_priority_locked(p, p->p_memstat_effectivepriority, false);
+
+ /*
+ * The update priority call above takes care to set/reset the fatal memory limit state
+ * IF the process is transitioning between foreground <-> background and has a background
+ * memory limit.
+ * Here, however, the process won't be doing any such transitions and so we explicitly tackle
+ * the fatal limit state.
+ */
+ is_fatal_limit = FALSE;
+
+ } else {
+ error = (task_set_phys_footprint_limit_internal(p->task, high_water_mark, NULL, TRUE) == 0) ? 0 : EINVAL;
+ }
+ }
+
+ if (error == 0) {
+ if (is_fatal_limit == TRUE) {
+ p->p_memstat_state |= P_MEMSTAT_FATAL_MEMLIMIT;
+ } else {
+ p->p_memstat_state &= ~P_MEMSTAT_FATAL_MEMLIMIT;
+ }
+ }
+
+ 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;
+
+#if !CONFIG_JETSAM
+ #pragma unused(ret)
+#endif
+
+ /* Root only for now */
+ if (!kauth_cred_issuser(kauth_cred_get())) {
+ error = EPERM;
+ goto out;
+ }
+
+ /* Sanity check */
+ if (args->buffersize > MEMORYSTATUS_BUFFERSIZE_MAX) {
+ error = EINVAL;
+ goto out;
+ }
+
+ switch (args->command) {
+ case MEMORYSTATUS_CMD_GET_PRIORITY_LIST:
+ error = memorystatus_cmd_get_priority_list(args->buffer, args->buffersize, ret);
+ break;
+#if CONFIG_JETSAM
+ case MEMORYSTATUS_CMD_SET_PRIORITY_PROPERTIES:
+ error = memorystatus_cmd_set_priority_properties(args->pid, 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);
+ break;
+ case MEMORYSTATUS_CMD_GET_PRESSURE_STATUS:
+ error = memorystatus_cmd_get_pressure_status(ret);
+ break;
+ case MEMORYSTATUS_CMD_SET_JETSAM_HIGH_WATER_MARK:
+ error = memorystatus_cmd_set_jetsam_memory_limit(args->pid, (int32_t)args->flags, ret, FALSE);
+ break;
+ case MEMORYSTATUS_CMD_SET_JETSAM_TASK_LIMIT:
+ 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;
+ break;
+ case MEMORYSTATUS_CMD_SET_JETSAM_PANIC_BITS:
+ error = memorystatus_cmd_set_panic_bits(args->buffer, args->buffersize);
+ break;
+#endif /* DEVELOPMENT || DEBUG */
+#endif /* CONFIG_JETSAM */
+ default:
+ break;
+ }
+
+out:
+ return error;
+}
+
+
+static int
+filt_memorystatusattach(struct knote *kn)
+{
+ kn->kn_flags |= EV_CLEAR;
+ return memorystatus_knote_register(kn);
+}
+
+static void
+filt_memorystatusdetach(struct knote *kn)
+{
+ memorystatus_knote_unregister(kn);
+}
+
+static int
+filt_memorystatus(struct knote *kn __unused, long hint)
+{
+ if (hint) {
+ switch (hint) {
+ case kMemorystatusNoPressure:
+ if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PRESSURE_NORMAL) {
+ kn->kn_fflags |= NOTE_MEMORYSTATUS_PRESSURE_NORMAL;
+ }
+ break;
+ case kMemorystatusPressure:
+ if (memorystatus_vm_pressure_level == kVMPressureWarning || memorystatus_vm_pressure_level == kVMPressureUrgent) {
+ if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PRESSURE_WARN) {
+ kn->kn_fflags |= NOTE_MEMORYSTATUS_PRESSURE_WARN;
+ }
+ } else if (memorystatus_vm_pressure_level == kVMPressureCritical) {
+
+ if (kn->kn_sfflags & NOTE_MEMORYSTATUS_PRESSURE_CRITICAL) {
+ kn->kn_fflags |= NOTE_MEMORYSTATUS_PRESSURE_CRITICAL;
+ }
+ }
+ break;
+ case kMemorystatusLowSwap:
+ if (kn->kn_sfflags & NOTE_MEMORYSTATUS_LOW_SWAP) {
+ kn->kn_fflags |= NOTE_MEMORYSTATUS_LOW_SWAP;
+ }
+ break;
+ default:
+ break;
+ }
+ }
+
+ return (kn->kn_fflags != 0);
+}
+
+static void
+memorystatus_klist_lock(void) {
+ lck_mtx_lock(&memorystatus_klist_mutex);
+}
+
+static void
+memorystatus_klist_unlock(void) {
+ lck_mtx_unlock(&memorystatus_klist_mutex);
+}
+
+void
+memorystatus_kevent_init(lck_grp_t *grp, lck_attr_t *attr) {
+ lck_mtx_init(&memorystatus_klist_mutex, grp, attr);
+ klist_init(&memorystatus_klist);
+}
+
+int
+memorystatus_knote_register(struct knote *kn) {
+ int error = 0;
+
+ memorystatus_klist_lock();
+
+ if (kn->kn_sfflags & (NOTE_MEMORYSTATUS_PRESSURE_NORMAL | NOTE_MEMORYSTATUS_PRESSURE_WARN | NOTE_MEMORYSTATUS_PRESSURE_CRITICAL | NOTE_MEMORYSTATUS_LOW_SWAP)) {
+
+ if (kn->kn_sfflags & NOTE_MEMORYSTATUS_LOW_SWAP) {
+ error = suser(kauth_cred_get(), 0);
+ }
+
+ if (error == 0) {
+ KNOTE_ATTACH(&memorystatus_klist, kn);
+ }
+ } else {
+ error = ENOTSUP;
+ }
+
+ memorystatus_klist_unlock();
+
+ return error;
+}
+
+void
+memorystatus_knote_unregister(struct knote *kn __unused) {
+ memorystatus_klist_lock();
+ KNOTE_DETACH(&memorystatus_klist, kn);
+ memorystatus_klist_unlock();
+}
+
+
+#if 0
+#if CONFIG_JETSAM && VM_PRESSURE_EVENTS
+static boolean_t
+memorystatus_issue_pressure_kevent(boolean_t pressured) {
+ memorystatus_klist_lock();
+ KNOTE(&memorystatus_klist, pressured ? kMemorystatusPressure : kMemorystatusNoPressure);
+ memorystatus_klist_unlock();
+ return TRUE;
+}
+#endif /* CONFIG_JETSAM && VM_PRESSURE_EVENTS */
+#endif /* 0 */
projects / apple / xnu.git / blobdiff