+
+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;
+ }
+
+ /* 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;
+ }
+
+ memorystatus_update_priority_locked(p, priority);
+}
+
+/*
+ * 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;
+ int ret;
+
+ proc_list_lock();
+
+ 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;
+ }
+
+ /* This can be set and cleared exactly once. */
+ if ((pcontrol & PROC_DIRTY_DEFER) && !(old_dirty & P_DIRTY_DEFER)) {
+ p->p_memstat_dirty |= (P_DIRTY_DEFER|P_DIRTY_DEFER_IN_PROGRESS);
+ } else {
+ p->p_memstat_dirty &= ~P_DIRTY_DEFER_IN_PROGRESS;
+ }
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_on_track_dirty(): set idle-exit %s / deferred %s / dirty %s for process %d\n",
+ ((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) ? "Y" : "N",
+ p->p_memstat_dirty & P_DIRTY_DEFER_IN_PROGRESS ? "Y" : "N",
+ p->p_memstat_dirty & P_DIRTY ? "Y" : "N",
+ p->p_pid);
+
+ /* Kick off or invalidate the idle exit deferment if there's a state transition. */
+ if (!(p->p_memstat_dirty & P_DIRTY_IS_DIRTY)) {
+ if (((p->p_memstat_dirty & P_DIRTY_IDLE_EXIT_ENABLED) == P_DIRTY_IDLE_EXIT_ENABLED) &&
+ (p->p_memstat_dirty & P_DIRTY_DEFER_IN_PROGRESS) && !(old_dirty & P_DIRTY_DEFER_IN_PROGRESS)) {
+ memorystatus_schedule_idle_demotion_locked(p, TRUE);
+ reschedule = TRUE;
+ } else if (!(p->p_memstat_dirty & P_DIRTY_DEFER_IN_PROGRESS) && (old_dirty & P_DIRTY_DEFER_IN_PROGRESS)) {
+ memorystatus_invalidate_idle_demotion_locked(p, TRUE);
+ 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);
+
+ proc_list_lock();
+
+ 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)) {
+ if (p->p_memstat_dirty & P_DIRTY_IS_DIRTY) {
+ memorystatus_invalidate_idle_demotion_locked(p, FALSE);
+ reschedule = TRUE;
+ } else {
+ /* We evaluate lazily, so reset the idle-deadline if it's expired by the time the process becomes clean. */
+ if (mach_absolute_time() >= p->p_memstat_idledeadline) {
+ p->p_memstat_idledeadline = 0;
+ p->p_memstat_dirty &= ~P_DIRTY_DEFER_IN_PROGRESS;
+ } else {
+ 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_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;
+ }
+ }
+
+ 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);
+#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
+
+static void
+memorystatus_thread_wake(void) {
+ thread_wakeup((event_t)&memorystatus_wakeup);
+}
+
+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);
+}
+
+extern boolean_t vm_compressor_thrashing_detected;
+extern uint64_t vm_compressor_total_compressions(void);
+
+static void
+memorystatus_thread(void *param __unused, wait_result_t wr __unused)
+{
+ static boolean_t is_vm_privileged = FALSE;
+#if CONFIG_JETSAM
+ boolean_t post_snapshot = FALSE;
+ uint32_t errors = 0;
+#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);
+
+ uint32_t cause = vm_compressor_thrashing_detected ? kMemorystatusKilledVMThrashing : kMemorystatusKilledVMPageShortage;
+
+ /* Jetsam aware version.
+ *
+ * If woken under pressure, go down the path of killing:
+ *
+ * - processes exceeding their highwater mark if no clean victims available
+ * - the least recently used process if no highwater mark victims available
+ */
+#if !LATENCY_JETSAM
+ while (vm_compressor_thrashing_detected || memorystatus_available_pages <= memorystatus_available_pages_critical) {
+#else
+ while (kill_under_pressure) {
+ const uint32_t SNAPSHOT_WAIT_TIMEOUT_MS = 100;
+ wait_result_t wait_result;
+#endif
+ boolean_t killed;
+ int32_t priority;
+
+#if LEGACY_HIWATER
+ /* Highwater */
+ killed = memorystatus_kill_hiwat_proc(&errors);
+ if (killed) {
+ post_snapshot = TRUE;
+ goto done;
+ }
+#endif
+
+ /* LRU */
+ killed = memorystatus_kill_top_process(TRUE, cause, &priority, &errors);
+ if (killed) {
+ if (!kill_under_pressure && (priority != JETSAM_PRIORITY_IDLE)) {
+ /* Don't generate logs for steady-state idle-exit kills */
+ post_snapshot = TRUE;
+ }
+ goto done;
+ }
+
+ /* Under pressure and unable to kill a process - panic */
+ panic("memorystatus_jetsam_thread: no victim! available pages:%d\n", memorystatus_available_pages);
+
+done:
+ kill_under_pressure = FALSE;
+ vm_compressor_thrashing_detected = FALSE;
+
+#if LATENCY_JETSAM
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_LATENCY_COALESCE) | DBG_FUNC_START,
+ memorystatus_available_pages, 0, 0, 0, 0);
+ thread_wakeup((event_t)&latency_jetsam_wakeup);
+ /*
+ * Coalesce snapshot reports in the face of repeated jetsams by blocking here with a timeout.
+ * If the wait expires, issue the note.
+ */
+ wait_result = memorystatus_thread_block(SNAPSHOT_WAIT_TIMEOUT_MS, THREAD_CONTINUE_NULL);
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_LATENCY_COALESCE) | DBG_FUNC_END,
+ memorystatus_available_pages, 0, 0, 0, 0);
+ if (wait_result != THREAD_AWAKENED) {
+ /* Catch-all */
+ break;
+ }
+#endif
+ }
+
+ if (errors) {
+ memorystatus_clear_errors();
+ }
+
+#if VM_PRESSURE_EVENTS
+ memorystatus_update_vm_pressure(TRUE);
+#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 */
+
+ /* Simple version.
+ *
+ * Jetsam not enabled, so just kill the first suitable clean process
+ * and sleep.
+ */
+
+ if (kill_idle_exit) {
+ kill_idle_exit_proc();
+ kill_idle_exit = FALSE;
+ }
+
+#endif /* CONFIG_JETSAM */
+
+ memorystatus_thread_block(0, memorystatus_thread);
+}
+
+#if !CONFIG_JETSAM
+boolean_t memorystatus_idle_exit_from_VM(void) {
+ kill_idle_exit = TRUE;
+ memorystatus_thread_wake();
+ return TRUE;
+}
+#endif
+
+#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 system-wide task memory limit.
+ */
+void
+memorystatus_on_ledger_footprint_exceeded(boolean_t warning, const int max_footprint_mb)
+{
+ proc_t p = current_proc();
+
+ printf("process %d (%s) %s physical memory footprint limit of %d MB\n",
+ p->p_pid, p->p_comm,
+ warning ? "approaching" : "exceeded",
+ max_footprint_mb);
+
+#if VM_PRESSURE_EVENTS
+ if (warning == TRUE) {
+ if (memorystatus_warn_process(p->p_pid) != TRUE) {
+ /* Print warning, since it's possible that task has not registered for pressure notifications */
+ printf("task_exceeded_footprint: failed to warn the current task (exiting?).\n");
+ }
+ return;
+ }
+#endif /* VM_PRESSURE_EVENTS */
+
+ if (p->p_memstat_memlimit <= 0) {
+ /*
+ * If this process has no high watermark, then we have been invoked because the task
+ * has violated the system-wide per-task memory limit.
+ */
+ if (memorystatus_kill_process_sync(p->p_pid, kMemorystatusKilledPerProcessLimit) != TRUE) {
+ printf("task_exceeded_footprint: failed to kill the current task (exiting?).\n");
+ }
+ }
+}
+
+static void
+memorystatus_get_task_page_counts(task_t task, uint32_t *footprint, uint32_t *max_footprint)
+{
+ assert(task);
+ assert(footprint);
+
+ *footprint = (uint32_t)(get_task_phys_footprint(task) / PAGE_SIZE_64);
+ if (max_footprint) {
+ *max_footprint = (uint32_t)(get_task_phys_footprint_max(task) / PAGE_SIZE_64);
+ }
+}
+
+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;
+}
+
+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)
+{
+ 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_available_pages = pages_avail;
+ memorystatus_level = memorystatus_available_pages * 100 / atop_64(max_mem);
+
+#if LATENCY_JETSAM
+ /* Bail early to avoid excessive wake-ups */
+ if (critical) {
+ return;
+ }
+#endif
+
+ memorystatus_thread_wake();
+ }
+}
+
+static boolean_t
+memorystatus_get_snapshot_properties_for_proc_locked(proc_t p, memorystatus_jetsam_snapshot_entry_t *entry)
+{
+ 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->state = memorystatus_build_state(p);
+ entry->user_data = p->p_memstat_userdata;
+ memcpy(&entry->uuid[0], &p->p_uuid[0], sizeof(p->p_uuid));
+
+ 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] - memorystatus_available_pages: %d\n",
+ victim_pid, (p->p_comm ? p->p_comm : "(unknown)"), 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();
+
+ 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 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) &&
+ ((!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: jetsam killing pid %d [%s] - memorystatus_available_pages: %d\n",
+ aPid, (p->p_comm ? p->p_comm : "(unknown)"), memorystatus_available_pages);
+ killed = memorystatus_do_kill(p, cause);
+ }
+
+ /* 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();
+
+ 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 pages > 1 (%d)\n",
+ (memorystatus_jetsam_policy & kPolicyDiagnoseActive) ? "suspending": "killing", aPid, p->p_comm, pages, hiwat);
+
+ 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)) {
+ return FALSE;
+ }
+
+ kill_under_pressure = TRUE;
+ 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_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);
+ if (pages < memorystatus_freeze_pages_min) {
+ continue; // with lock held
+ }
+
+ if (DEFAULT_FREEZER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) {
+ /* Ensure there's enough free space to freeze this process. */
+ max_pages = MIN(default_pager_swap_pages_free(), memorystatus_freeze_pages_max);
+ if (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 */
+ if (!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 CONFIG_JETSAM && VM_PRESSURE_EVENTS
+
+boolean_t
+memorystatus_warn_process(pid_t pid) {
+ return (vm_dispatch_pressure_note_to_pid(pid, FALSE) == 0);
+}
+
+static inline boolean_t
+memorystatus_update_pressure_locked(boolean_t *pressured) {
+ vm_pressure_level_t old_level, new_level;
+
+ old_level = memorystatus_vm_pressure_level;
+
+ if (memorystatus_available_pages > memorystatus_available_pages_pressure) {
+ /* Too many free pages */
+ new_level = kVMPressureNormal;
+ }
+#if CONFIG_FREEZE
+ else if (memorystatus_frozen_count > 0) {
+ /* Frozen processes exist */
+ new_level = kVMPressureNormal;
+ }
+#endif
+ else if (memorystatus_suspended_count > MEMORYSTATUS_SUSPENDED_THRESHOLD) {
+ /* Too many supended processes */
+ new_level = kVMPressureNormal;
+ }
+ else if (memorystatus_suspended_count > 0) {
+ /* Some suspended processes - warn */
+ new_level = kVMPressureWarning;
+ }
+ else {
+ /* Otherwise, pressure level is urgent */
+ new_level = kVMPressureUrgent;
+ }
+
+ *pressured = (new_level != kVMPressureNormal);
+
+ /* Did the pressure level change? */
+ if (old_level != new_level) {
+ MEMORYSTATUS_DEBUG(1, "memorystatus_update_pressure_locked(): memory pressure changed %d -> %d; memorystatus_available_pages: %d\n ",
+ old_level, new_level, memorystatus_available_pages);
+ memorystatus_vm_pressure_level = new_level;
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+kern_return_t
+memorystatus_update_vm_pressure(boolean_t target_foreground) {
+ boolean_t pressure_changed, pressured;
+ boolean_t warn = FALSE;
+
+ /*
+ * Centralised pressure handling routine. Called from:
+ * - The main jetsam thread. In this case, we update the pressure level and dispatch warnings to the foreground
+ * process *only*, each time the available page % drops.
+ * - The pageout scan path. In this scenario, every other registered process is targeted in footprint order.
+ *
+ * This scheme guarantees delivery to the foreground app, while providing for warnings to the remaining processes
+ * driven by the pageout scan.
+ */
+
+ MEMORYSTATUS_DEBUG(1, "memorystatus_update_vm_pressure(): foreground %d; available %d, critical %d, pressure %d\n",
+ target_foreground, memorystatus_available_pages, memorystatus_available_pages_critical, memorystatus_available_pages_pressure);
+
+ proc_list_lock();
+
+ pressure_changed = memorystatus_update_pressure_locked(&pressured);
+
+ if (pressured) {
+ if (target_foreground) {
+ if (memorystatus_available_pages != memorystatus_last_foreground_pressure_pages) {
+ if (memorystatus_available_pages < memorystatus_last_foreground_pressure_pages) {
+ warn = TRUE;
+ }
+ memorystatus_last_foreground_pressure_pages = memorystatus_available_pages;
+ }
+ } else {
+ warn = TRUE;
+ }
+ } else if (pressure_changed) {
+ memorystatus_last_foreground_pressure_pages = (unsigned int)-1;
+ }
+
+ proc_list_unlock();
+
+ /* Target foreground processes if specified */
+ if (warn) {
+ if (target_foreground) {
+ MEMORYSTATUS_DEBUG(1, "memorystatus_update_vm_pressure(): invoking vm_find_pressure_foreground_candidates()\n");
+ vm_find_pressure_foreground_candidates();
+ } else {
+ MEMORYSTATUS_DEBUG(1, "memorystatus_update_vm_pressure(): invoking vm_find_pressure_candidate()\n");
+ /* Defer to VM code. This can race with the foreground priority, but
+ * it's preferable to holding onto locks for an extended period. */
+ vm_find_pressure_candidate();
+ }
+ }
+
+ /* Dispatch the global kevent to privileged listeners */
+ if (pressure_changed) {
+ memorystatus_issue_pressure_kevent(pressured);
+ }
+
+ return KERN_SUCCESS;
+}
+
+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));
+}
+
+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));
+}
+
+#else /* CONFIG_JETSAM && VM_PRESSURE_EVENTS */
+
+/*
+ * 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);
+
+extern
+kern_return_t vm_pressure_notification_without_levels(void);
+
+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*, int, task_t, vm_pressure_level_t, vm_pressure_level_t);
+
+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(void);
+
+kern_return_t
+memorystatus_update_vm_pressure(boolean_t target_best_process)
+{
+ struct knote *kn_max = NULL;
+ pid_t target_pid = -1;
+ struct klist dispatch_klist = { NULL };
+ proc_t target_proc = PROC_NULL;
+ static vm_pressure_level_t level_snapshot = kVMPressureNormal;
+ struct task *task = NULL;
+ boolean_t found_candidate = FALSE;
+
+ 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;
+
+ memorystatus_klist_lock();
+ kn_max = vm_pressure_select_optimal_candidate_to_notify(&memorystatus_klist, level_snapshot);
+
+ 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 (target_best_process == TRUE) {
+ break;
+ }
+
+try_dispatch_vm_clients:
+ if (level_snapshot != kVMPressureNormal) {
+ /*
+ * Wake up idle-exit thread.
+ * Targets one process per invocation.
+ *
+ * TODO: memorystatus_idle_exit_from_VM should return FALSE once it's
+ * done with all idle-exitable processes. Currently, we will exit this
+ * loop when we are done with notification clients (level and non-level based)
+ * but we may still have some idle-exitable processes around.
+ *
+ */
+ memorystatus_idle_exit_from_VM();
+
+ if ((vm_pressure_notify_dispatch_vm_clients() == 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;
+ }
+ }
+
+ if (memorystatus_manual_testing_on == FALSE) {
+ delay(INTER_NOTIFICATION_DELAY);
+ }
+ }
+
+ return KERN_SUCCESS;
+}
+
+vm_pressure_level_t
+convert_internal_pressure_level_to_dispatch_level(vm_pressure_level_t);
+
+vm_pressure_level_t
+convert_internal_pressure_level_to_dispatch_level(vm_pressure_level_t internal_pressure_level)
+{
+ 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));
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, memorystatus_vm_pressure_level, CTLTYPE_INT|CTLFLAG_RD|CTLFLAG_LOCKED,
+ 0, 0, &sysctl_memorystatus_vm_pressure_level, "I", "");
+
+
+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();
+ 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 /* CONFIG_JETSAM && 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 !LATENCY_JETSAM
+ {
+ // If there's an entry in the first bucket, we have idle processes
+ memstat_bucket_t *first_bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE];
+ if (first_bucket->count) {
+ memorystatus_available_pages_critical += memorystatus_available_pages_critical_idle_offset;
+ }
+ }
+#endif
+#if DEBUG || DEVELOPMENT
+ if (memorystatus_jetsam_policy & kPolicyDiagnoseActive) {
+ memorystatus_available_pages_critical += memorystatus_jetsam_policy_offset_pages_diagnostic;
+ }
+#endif
+
+ if (critical_only) {
+ return;
+ }
+
+#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;
+}
+
+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);
+ 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;
+}
+
+static int
+memorystatus_cmd_set_jetsam_high_water_mark(pid_t pid, int32_t high_water_mark, __unused int32_t *retval) {
+ 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();
+
+ if (p->p_memstat_state & P_MEMSTAT_INTERNAL) {
+ error = EPERM;
+ goto exit;
+ }
+
+ 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);
+ } else {
+ error = (task_set_phys_footprint_limit_internal(p->task, high_water_mark, NULL, TRUE) == 0) ? 0 : EINVAL;
+ }
+ }
+
+exit:
+ proc_list_unlock();
+ proc_rele(p);
+
+ return error;
+}
+
+#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_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:
+ /* TODO: deprecate. Keeping it in as there's no pid based way to set the ledger limit right now. */
+ error = memorystatus_cmd_set_jetsam_high_water_mark(args->pid, (int32_t)args->flags, ret);
+ 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;
+ 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)) {
+
+#if CONFIG_JETSAM && VM_PRESSURE_EVENTS
+ /* Need a privilege to register */
+ error = priv_check_cred(kauth_cred_get(), PRIV_VM_PRESSURE, 0);
+#endif /* CONFIG_JETSAM && VM_PRESSURE_EVENTS */
+
+ if (!error) {
+ 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 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 */
projects / apple / xnu.git / blobdiff