X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/d1ecb069dfe24481e4a83f44cb5217a2b06746d7..15129b1c8dbb3650c63b70adb1cad9af601c6c17:/bsd/kern/kern_memorystatus.c diff --git a/bsd/kern/kern_memorystatus.c b/bsd/kern/kern_memorystatus.c index dfbaa794d..852037af4 100644 --- a/bsd/kern/kern_memorystatus.c +++ b/bsd/kern/kern_memorystatus.c @@ -27,399 +27,3394 @@ * */ -#include -#include - #include +#include +#include +#include #include #include #include +#include #include +#include #include -#include +#include +#include +#include +#include #include +#include #include #include #include +#include #include +#include +#include +#include +#include + +#if CONFIG_FREEZE +#include +#endif /* CONFIG_FREEZE */ + +#include + +/* 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 = 1, + kMemorystatusPressure = 2 +}; + +/* 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); + +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; + +#if !CONFIG_JETSAM +static boolean_t kill_idle_exit = FALSE; +#endif + + +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 + +/* Kill processes exceeding their limit either under memory pressure (1), or as soon as possible (0) */ +#define LEGACY_HIWATER 1 + +static int memorystatus_highwater_enabled = 1; 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); +unsigned int memorystatus_delta = 0; -int kern_memorystatus_wakeup = 0; -int kern_memorystatus_level = 0; -int kern_memorystatus_last_level = 0; -unsigned int kern_memorystatus_kev_failure_count = 0; -int kern_memorystatus_level_critical = 5; -#define kern_memorystatus_level_highwater (kern_memorystatus_level_critical + 5) +static unsigned int memorystatus_available_pages = (unsigned int)-1; +static unsigned int memorystatus_available_pages_pressure = 0; +static unsigned int memorystatus_available_pages_critical = 0; +static unsigned int memorystatus_available_pages_critical_base = 0; +static unsigned int memorystatus_last_foreground_pressure_pages = (unsigned int)-1; +#if !LATENCY_JETSAM +static unsigned int memorystatus_available_pages_critical_idle_offset = 0; +#endif -static struct { - jetsam_kernel_stats_t stats; - size_t entry_count; - jetsam_snapshot_entry_t entries[kMaxSnapshotEntries]; -} jetsam_snapshot; +#if DEVELOPMENT || DEBUG +static unsigned int memorystatus_jetsam_panic_debug = 0; -static jetsam_priority_entry_t jetsam_priority_list[kMaxPriorityEntries]; -#define jetsam_snapshot_list jetsam_snapshot.entries +static unsigned int memorystatus_jetsam_policy = kPolicyDefault; +static unsigned int memorystatus_jetsam_policy_offset_pages_diagnostic = 0; +#endif -static int jetsam_priority_list_index = 0; -static int jetsam_priority_list_count = 0; -static int jetsam_snapshot_list_count = 0; +static boolean_t kill_under_pressure = FALSE; -static lck_mtx_t * jetsam_list_mlock; -static lck_attr_t * jetsam_lck_attr; -static lck_grp_t * jetsam_lck_grp; -static lck_grp_attr_t * jetsam_lck_grp_attr; +static memorystatus_jetsam_snapshot_t *memorystatus_jetsam_snapshot; +#define memorystatus_jetsam_snapshot_list memorystatus_jetsam_snapshot->entries -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, ""); +static unsigned int memorystatus_jetsam_snapshot_count = 0; +static unsigned int memorystatus_jetsam_snapshot_max = 0; -__private_extern__ void -kern_memorystatus_init(void) -{ - jetsam_lck_attr = lck_attr_alloc_init(); - jetsam_lck_grp_attr= lck_grp_attr_alloc_init(); - jetsam_lck_grp = lck_grp_alloc_init("jetsam", jetsam_lck_grp_attr); - jetsam_list_mlock = lck_mtx_alloc_init(jetsam_lck_grp, jetsam_lck_attr); +static void memorystatus_clear_errors(void); +static void memorystatus_get_task_page_counts(task_t task, uint32_t *footprint, uint32_t *max_footprint); +static int memorystatus_send_note(int event_code, void *data, size_t data_length); +static 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); - (void)kernel_thread(kernel_task, kern_memorystatus_thread); -} +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 uint32_t -jetsam_task_page_count(task_t task) +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 */ + +#if VM_PRESSURE_EVENTS + +#include "vm_pressure.h" + +extern boolean_t memorystatus_warn_process(pid_t pid); + +vm_pressure_level_t memorystatus_vm_pressure_level = kVMPressureNormal; + +#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 = FREEZE_PAGES_MIN; +static unsigned int memorystatus_freeze_pages_max = FREEZE_PAGES_MAX; + +static unsigned int memorystatus_frozen_count = 0; + +static unsigned int memorystatus_freeze_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_count = 0; +static unsigned int memorystatus_suspended_footprint_total = 0; + +#endif /* CONFIG_FREEZE */ + +/* Debug */ + +#if DEVELOPMENT || DEBUG + +#if CONFIG_JETSAM + +/* Debug aid to aid determination of limit */ + +static int +sysctl_memorystatus_highwater_enable SYSCTL_HANDLER_ARGS { - kern_return_t ret; - static task_info_data_t data; - static struct task_basic_info *info = (struct task_basic_info *)&data; - static mach_msg_type_number_t count = TASK_BASIC_INFO_COUNT; +#pragma unused(oidp, arg2) + proc_t p; + unsigned int b = 0; + int error, enable = 0; + int32_t memlimit; - ret = task_info(task, TASK_BASIC_INFO, (task_info_t)&data, &count); - if (ret == KERN_SUCCESS) { - return info->resident_size / PAGE_SIZE; + error = SYSCTL_OUT(req, arg1, sizeof(int)); + if (error || !req->newptr) { + return (error); } - return 0; -} -static uint32_t -jetsam_flags_for_pid(pid_t pid) -{ - int i; + error = SYSCTL_IN(req, &enable, sizeof(int)); + if (error || !req->newptr) { + return (error); + } + + if (!(enable == 0 || enable == 1)) { + return EINVAL; + } - for (i = 0; i < jetsam_priority_list_count; i++) { - if (pid == jetsam_priority_list[i].pid) { - return jetsam_priority_list[i].flags; + 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); + + p = memorystatus_get_next_proc_locked(&b, p, TRUE); } + + memorystatus_highwater_enabled = enable; + + proc_list_unlock(); + return 0; } -static void -jetsam_snapshot_procs(void) +SYSCTL_PROC(_kern, OID_AUTO, memorystatus_highwater_enabled, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_highwater_enabled, 0, sysctl_memorystatus_highwater_enable, "I", ""); + +SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages, CTLFLAG_RD|CTLFLAG_LOCKED, &memorystatus_available_pages, 0, ""); +SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical, CTLFLAG_RD|CTLFLAG_LOCKED, &memorystatus_available_pages_critical, 0, ""); +SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical_base, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_available_pages_critical_base, 0, ""); +#if !LATENCY_JETSAM +SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical_idle_offset, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_available_pages_critical_idle_offset, 0, ""); +#endif + +/* 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 { - proc_t p; - int i = 0; +#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; - jetsam_snapshot.stats.free_pages = vm_page_free_count; - jetsam_snapshot.stats.active_pages = vm_page_active_count; - jetsam_snapshot.stats.inactive_pages = vm_page_inactive_count; - jetsam_snapshot.stats.purgeable_pages = vm_page_purgeable_count; - jetsam_snapshot.stats.wired_pages = vm_page_wire_count; + 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(); - LIST_FOREACH(p, &allproc, p_list) { - task_t task = p->task; - jetsam_snapshot_list[i].pid = p->p_pid; - jetsam_snapshot_list[i].pages = jetsam_task_page_count(task); - jetsam_snapshot_list[i].flags = jetsam_flags_for_pid(p->p_pid); - strlcpy(&jetsam_snapshot_list[i].name[0], p->p_comm, MAXCOMLEN+1); -#ifdef DEBUG - printf("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]); -#endif - memcpy(&jetsam_snapshot_list[i].uuid[0], &p->p_uuid[0], sizeof(p->p_uuid)); - i++; - if (i == kMaxSnapshotEntries) { + + 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(); - jetsam_snapshot.entry_count = jetsam_snapshot_list_count = i - 1; + + proc_list_unlock(); + + if (changed) { + printf("%s\n", diagnosticStrings[val]); + } + + return (0); } -static void -jetsam_mark_pid_in_snapshot(pid_t pid, int flag) +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, ""); + +static int +sysctl_memorystatus_vm_pressure_level SYSCTL_HANDLER_ARGS { +#pragma unused(arg1, arg2, oidp) + int error = 0; - int i = 0; + error = priv_check_cred(kauth_cred_get(), PRIV_VM_PRESSURE, 0); + if (error) + return (error); - for (i = 0; i < jetsam_snapshot_list_count; i++) { - if (jetsam_snapshot_list[i].pid == pid) { - jetsam_snapshot_list[i].flags |= flag; - return; - } - } + return SYSCTL_OUT(req, &memorystatus_vm_pressure_level, sizeof(memorystatus_vm_pressure_level)); } -int -jetsam_kill_top_proc(void) +SYSCTL_PROC(_kern, OID_AUTO, memorystatus_vm_pressure_level, CTLTYPE_INT|CTLFLAG_RD|CTLFLAG_LOCKED|CTLFLAG_MASKED, + 0, 0, &sysctl_memorystatus_vm_pressure_level, "I", ""); + +static int +sysctl_memorystatus_vm_pressure_send SYSCTL_HANDLER_ARGS +{ +#pragma unused(arg1, arg2) + + int error, pid = 0; + + error = sysctl_handle_int(oidp, &pid, 0, req); + if (error || !req->newptr) + return (error); + + return vm_dispatch_pressure_note_to_pid(pid, FALSE); +} + +SYSCTL_PROC(_kern, OID_AUTO, memorystatus_vm_pressure_send, CTLTYPE_INT|CTLFLAG_WR|CTLFLAG_LOCKED|CTLFLAG_MASKED, + 0, 0, &sysctl_memorystatus_vm_pressure_send, "I", ""); + +#endif /* VM_PRESSURE_EVENTS */ + +#endif /* CONFIG_JETSAM */ + +#endif /* DEVELOPMENT || DEBUG */ + +#if CONFIG_FREEZE + +SYSCTL_UINT(_kern, OID_AUTO, memorystatus_freeze_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, ""); + +/* + * Enabled via: Enable the sysctl_memorystatus_freeze/thaw sysctls on Release KC + * + * TODO: Manual trigger of freeze and thaw for dev / debug kernels only. + * Disable/restrict the sysctl_memorystatus_freeze/thaw sysctls on Release KC + */ +static int +sysctl_memorystatus_freeze SYSCTL_HANDLER_ARGS { +#pragma unused(arg1, arg2) + + int error, pid = 0; proc_t p; - if (jetsam_snapshot_list_count == 0) { - jetsam_snapshot_procs(); - } - lck_mtx_lock(jetsam_list_mlock); - while (jetsam_priority_list_index < jetsam_priority_list_count) { - pid_t aPid; - aPid = jetsam_priority_list[jetsam_priority_list_index].pid; - jetsam_priority_list_index++; - /* skip empty slots in the list */ - if (aPid == 0) { - continue; // with lock held - } - lck_mtx_unlock(jetsam_list_mlock); - jetsam_mark_pid_in_snapshot(aPid, kJetsamFlagsKilled); - p = proc_find(aPid); - if (p != NULL) { - printf("jetsam: killing pid %d [%s] - memory_status_level: %d - ", - aPid, (p->p_comm ? p->p_comm : "(unknown)"), kern_memorystatus_level); - exit1(p, W_EXITCODE(0, SIGKILL), (int *)NULL); - proc_rele(p); -#if DEBUG - printf("jetsam: pid %d killed - memory_status_level: %d\n", aPid, kern_memorystatus_level); -#endif /* DEBUG */ - return 0; + 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_ACTIVE) { + max_pages = MIN(default_pager_swap_pages_free(), memorystatus_freeze_pages_max); + } else { + max_pages = UINT32_MAX - 1; } - lck_mtx_lock(jetsam_list_mlock); + error = task_freeze(p->task, &purgeable, &wired, &clean, &dirty, max_pages, &shared, FALSE); + proc_rele(p); + + if (error) + error = EIO; + return error; } - lck_mtx_unlock(jetsam_list_mlock); - return -1; + 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 -jetsam_kill_hiwat_proc(void) +sysctl_memorystatus_available_pages_thaw SYSCTL_HANDLER_ARGS { +#pragma unused(arg1, arg2) + + int error, pid = 0; proc_t p; - int i; - if (jetsam_snapshot_list_count == 0) { - jetsam_snapshot_procs(); - } - lck_mtx_lock(jetsam_list_mlock); - for (i = jetsam_priority_list_index; i < jetsam_priority_list_count; i++) { - pid_t aPid; - int32_t hiwat; - aPid = jetsam_priority_list[i].pid; - hiwat = jetsam_priority_list[i].hiwat_pages; - /* skip empty or non-hiwat slots in the list */ - if (aPid == 0 || (hiwat < 0)) { - continue; // with lock held - } - lck_mtx_unlock(jetsam_list_mlock); - p = proc_find(aPid); - if (p != NULL) { - int32_t pages = (int32_t)jetsam_task_page_count(p->task); - if (pages > hiwat) { -#if DEBUG - printf("jetsam: killing pid %d [%s] - %d pages > hiwat (%d)\n", aPid, p->p_comm, pages, hiwat); -#endif /* DEBUG */ - exit1(p, W_EXITCODE(0, SIGKILL), (int *)NULL); - proc_rele(p); -#if DEBUG - printf("jetsam: pid %d killed - memory_status_level: %d\n", aPid, kern_memorystatus_level); -#endif /* DEBUG */ - jetsam_mark_pid_in_snapshot(aPid, kJetsamFlagsKilledHiwat); - jetsam_priority_list[i].pid = 0; - return 0; - } else { - proc_rele(p); - } - } - lck_mtx_lock(jetsam_list_mlock); + 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; } - lck_mtx_unlock(jetsam_list_mlock); - return -1; + + return EINVAL; } -static void -kern_memorystatus_thread(void) -{ - struct kev_msg ev_msg; - jetsam_kernel_stats_t data; - int ret; +SYSCTL_PROC(_kern, OID_AUTO, memorystatus_thaw, CTLTYPE_INT|CTLFLAG_WR|CTLFLAG_LOCKED|CTLFLAG_MASKED, + 0, 0, &sysctl_memorystatus_available_pages_thaw, "I", ""); - while(1) { +#endif /* CONFIG_FREEZE */ - while (kern_memorystatus_level <= kern_memorystatus_level_critical) { - if (jetsam_kill_top_proc() < 0) { - break; - } - } +extern kern_return_t kernel_thread_start_priority(thread_continue_t continuation, + void *parameter, + integer_t priority, + thread_t *new_thread); - while (kern_memorystatus_level <= kern_memorystatus_level_highwater) { - if (jetsam_kill_hiwat_proc() < 0) { - break; - } - } - - kern_memorystatus_last_level = kern_memorystatus_level; - - ev_msg.vendor_code = KEV_VENDOR_APPLE; - ev_msg.kev_class = KEV_SYSTEM_CLASS; - ev_msg.kev_subclass = KEV_MEMORYSTATUS_SUBCLASS; - - /* pass the memory status level (percent free) */ - ev_msg.event_code = kMemoryStatusLevelNote; - - ev_msg.dv[0].data_length = sizeof kern_memorystatus_last_level; - ev_msg.dv[0].data_ptr = &kern_memorystatus_last_level; - ev_msg.dv[1].data_length = sizeof data; - ev_msg.dv[1].data_ptr = &data; - ev_msg.dv[2].data_length = 0; - - 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; - - ret = kev_post_msg(&ev_msg); - if (ret) { - kern_memorystatus_kev_failure_count++; - printf("%s: kev_post_msg() failed, err %d\n", __func__, ret); - } - - if (jetsam_snapshot_list_count) { - size_t snapshot_size = sizeof(jetsam_kernel_stats_t) + sizeof(size_t) + sizeof(jetsam_snapshot_entry_t) * jetsam_snapshot_list_count; - ev_msg.event_code = kMemoryStatusSnapshotNote; - ev_msg.dv[0].data_length = sizeof snapshot_size; - ev_msg.dv[0].data_ptr = &snapshot_size; - ev_msg.dv[1].data_length = 0; - - ret = kev_post_msg(&ev_msg); - if (ret) { - kern_memorystatus_kev_failure_count++; - printf("%s: kev_post_msg() failed, err %d\n", __func__, ret); - } +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; +} - if (kern_memorystatus_level >= kern_memorystatus_last_level + 5 || - kern_memorystatus_level <= kern_memorystatus_last_level - 5) - continue; +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; + } - assert_wait(&kern_memorystatus_wakeup, THREAD_UNINT); - (void)thread_block((thread_continue_t)kern_memorystatus_thread); + 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; } -static int -sysctl_io_variable(struct sysctl_req *req, void *pValue, size_t currentsize, size_t maxsize, size_t *newsize) +__private_extern__ void +memorystatus_init(void) { - int error; + thread_t thread = THREAD_NULL; + kern_return_t result; + int i; - /* Copy blob out */ - error = SYSCTL_OUT(req, pValue, currentsize); + 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); - /* error or nothing to set */ - if (error || !req->newptr) - return(error); + /* 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; +#if !LATENCY_JETSAM + memorystatus_available_pages_critical_idle_offset = idle_offset_percentage * atop_64(max_mem) / 100; +#endif - if (req->newlen > maxsize) { - return EINVAL; + 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"); } - error = SYSCTL_IN(req, pValue, req->newlen); +} + +/* Centralised for the purposes of allowing panic-on-jetsam */ +extern void +vm_wake_compactor_swapper(void); + +static boolean_t +memorystatus_do_kill(proc_t p, uint32_t cause) { + + int retval = 0; - if (!error) { - *newsize = req->newlen; +#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 kMemorystatusKilledPerProcessLimit: jetsam_flags |= P_JETSAM_PID; break; + case kMemorystatusKilledIdleExit: jetsam_flags |= P_JETSAM_IDLEEXIT; break; + } + retval = exit1_internal(p, W_EXITCODE(0, SIGKILL), (int *)NULL, FALSE, FALSE, jetsam_flags); - return(error); + if (COMPRESSED_PAGER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) { + vm_wake_compactor_swapper(); + } + + return (retval == 0); } -static int -sysctl_handle_kern_memorystatus_priority_list(__unused struct sysctl_oid *oid, __unused void *arg1, __unused int arg2, struct sysctl_req *req) +/* + * 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) { - int i, ret; - jetsam_priority_entry_t temp_list[kMaxPriorityEntries]; - size_t newsize, currentsize; + 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(); - if (req->oldptr) { - lck_mtx_lock(jetsam_list_mlock); - for (i = 0; i < jetsam_priority_list_count; i++) { - temp_list[i] = jetsam_priority_list[i]; + demotion_bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE_DEFERRED]; + p = TAILQ_FIRST(&demotion_bucket->list); + + while (p) { + MEMORYSTATUS_DEBUG(1, "memorystatus_perform_idle_demotion() found %d\n", p->p_pid); + + assert(p->p_memstat_idledeadline); + assert(p->p_memstat_dirty & P_DIRTY_DEFER_IN_PROGRESS); + assert((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_IS_DIRTY)) == P_DIRTY_IDLE_EXIT_ENABLED); + + if (current_time >= p->p_memstat_idledeadline) { +#if DEBUG || DEVELOPMENT + if (!(p->p_memstat_dirty & P_DIRTY_MARKED)) { + printf("memorystatus_perform_idle_demotion: moving process %d to idle band, but never dirtied (0x%x)!\n", p->p_pid, p->p_memstat_dirty); + } +#endif + memorystatus_invalidate_idle_demotion_locked(p, TRUE); + memorystatus_update_priority_locked(p, JETSAM_PRIORITY_IDLE); + + // The prior process has moved out of the demotion bucket, so grab the new head and continue + p = TAILQ_FIRST(&demotion_bucket->list); + continue; } - lck_mtx_unlock(jetsam_list_mlock); + + // No further candidates + break; } + + memorystatus_reschedule_idle_demotion_locked(); + + proc_list_unlock(); - currentsize = sizeof(jetsam_priority_list[0]) * jetsam_priority_list_count; + KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_IDLE_DEMOTE) | DBG_FUNC_END, 0, 0, 0, 0, 0); +} - ret = sysctl_io_variable(req, &temp_list[0], currentsize, sizeof(temp_list), &newsize); +static void +memorystatus_schedule_idle_demotion_locked(proc_t p, boolean_t set_state) +{ + MEMORYSTATUS_DEBUG(1, "memorystatus_schedule_idle_demotion_locked: scheduling demotion to idle band for process %d (dirty:0x%x, set_state %d, demotions %d).\n", + p->p_pid, p->p_memstat_dirty, set_state, memorystatus_scheduled_idle_demotions); - if (!ret && req->newptr) { - jetsam_priority_list_count = newsize / sizeof(jetsam_priority_list[0]); -#if DEBUG - printf("set jetsam priority pids = { "); - for (i = 0; i < jetsam_priority_list_count; i++) { - printf("(%d, 0x%08x, %d) ", temp_list[i].pid, temp_list[i].flags, temp_list[i].hiwat_pages); - } - printf("}\n"); -#endif /* DEBUG */ - lck_mtx_lock(jetsam_list_mlock); - for (i = 0; i < jetsam_priority_list_count; i++) { - jetsam_priority_list[i] = temp_list[i]; - } - for (i = jetsam_priority_list_count; i < kMaxPriorityEntries; i++) { - jetsam_priority_list[i].pid = 0; - jetsam_priority_list[i].flags = 0; - jetsam_priority_list[i].hiwat_pages = -1; - jetsam_priority_list[i].hiwat_reserved1 = -1; - jetsam_priority_list[i].hiwat_reserved2 = -1; - jetsam_priority_list[i].hiwat_reserved3 = -1; + assert((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_DEFER_IN_PROGRESS)) == (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_DEFER_IN_PROGRESS)); + + if (set_state) { + assert(p->p_memstat_idledeadline == 0); + p->p_memstat_idledeadline = mach_absolute_time() + memorystatus_idle_delay_time; + } + + assert(p->p_memstat_idledeadline); + + memorystatus_scheduled_idle_demotions++; +} + +static void +memorystatus_invalidate_idle_demotion_locked(proc_t p, boolean_t clear_state) +{ + MEMORYSTATUS_DEBUG(1, "memorystatus_invalidate_idle_demotion(): invalidating demotion to idle band for process %d (clear_state %d, demotions %d).\n", + p->p_pid, clear_state, memorystatus_scheduled_idle_demotions); + + assert(p->p_memstat_idledeadline); + + if (clear_state) { + p->p_memstat_idledeadline = 0; + p->p_memstat_dirty &= ~P_DIRTY_DEFER_IN_PROGRESS; + } + + 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; } - jetsam_priority_list_index = 0; - lck_mtx_unlock(jetsam_list_mlock); - } - return ret; + } } -static int -sysctl_handle_kern_memorystatus_snapshot(__unused struct sysctl_oid *oid, __unused void *arg1, __unused int arg2, struct sysctl_req *req) +/* + * List manipulation + */ + +int +memorystatus_add(proc_t p, boolean_t locked) { - int ret; - size_t currentsize = 0; + memstat_bucket_t *bucket; + + MEMORYSTATUS_DEBUG(1, "memorystatus_list_add(): adding process %d with priority %d.\n", p->pid, priority); + + 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]; + + TAILQ_INSERT_TAIL(&bucket->list, p, p_memstat_list); + bucket->count++; - if (jetsam_snapshot_list_count > 0) { - currentsize = sizeof(jetsam_kernel_stats_t) + sizeof(size_t) + sizeof(jetsam_snapshot_entry_t) * jetsam_snapshot_list_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) +{ + 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; } - if (!currentsize) { - if (req->oldptr) { -#ifdef DEBUG - printf("kern.memorystatus_snapshot returning EINVAL\n"); -#endif - return EINVAL; + + MEMORYSTATUS_DEBUG(1, "memorystatus_update_priority_locked(): setting process %d to priority %d\n", p->p_pid, priority); + + old_bucket = &memstat_bucket[p->p_memstat_effectivepriority]; + TAILQ_REMOVE(&old_bucket->list, p, p_memstat_list); + old_bucket->count--; + + new_bucket = &memstat_bucket[priority]; + TAILQ_INSERT_TAIL(&new_bucket->list, p, p_memstat_list); + new_bucket->count++; + +#if CONFIG_JETSAM + if (memorystatus_highwater_enabled && (p->p_memstat_state & P_MEMSTAT_MEMLIMIT_BACKGROUND)) { + if (((priority >= JETSAM_PRIORITY_FOREGROUND) && (p->p_memstat_effectivepriority < JETSAM_PRIORITY_FOREGROUND)) || + ((priority < JETSAM_PRIORITY_FOREGROUND) && (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND))) { + int32_t memlimit = (priority >= JETSAM_PRIORITY_FOREGROUND) ? -1 : p->p_memstat_memlimit; + task_set_phys_footprint_limit_internal(p->task, (memlimit > 0) ? memlimit : -1, NULL, TRUE); } - else { -#ifdef DEBUG - printf("kern.memorystatus_snapshot returning 0 for size\n"); + } #endif - } - } else { -#ifdef DEBUG - printf("kern.memorystatus_snapshot returning %ld for size\n", (long)currentsize); + + 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) +{ + int ret; + +#if !CONFIG_JETSAM +#pragma unused(update_memlimit, memlimit, memlimit_background) #endif - } - ret = sysctl_io_variable(req, &jetsam_snapshot, currentsize, 0, NULL); - if (!ret && req->oldptr) { - jetsam_snapshot.entry_count = jetsam_snapshot_list_count = 0; + + 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 < 0) || (priority >= MEMSTAT_BUCKET_COUNT)) { + /* Sanity check */ + ret = EINVAL; + goto out; + } + + proc_list_lock(); + + assert(!(p->p_memstat_state & P_MEMSTAT_INTERNAL)); + + if (effective && (p->p_memstat_state & P_MEMSTAT_PRIORITYUPDATED)) { + ret = EALREADY; + proc_list_unlock(); + MEMORYSTATUS_DEBUG(1, "memorystatus_update: effective change specified for pid %d, but change already occurred.\n", pid); + 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; + } else { + /* Otherwise, apply now */ + if (memorystatus_highwater_enabled) { + task_set_phys_footprint_limit_internal(p->task, (memlimit > 0) ? memlimit : -1, NULL, TRUE); + } + } + } +#endif + + memorystatus_update_priority_locked(p, priority); + + 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", pid); + + if (!locked) { + proc_list_lock(); + } + + assert(!(p->p_memstat_state & P_MEMSTAT_INTERNAL)); + + bucket = &memstat_bucket[p->p_memstat_effectivepriority]; + 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; + } + + /* 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 */ + 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 . + */ + 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 . + */ + 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; } -SYSCTL_PROC(_kern, OID_AUTO, memorystatus_priority_list, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 0, sysctl_handle_kern_memorystatus_priority_list, "S,jetsam_priorities", ""); -SYSCTL_PROC(_kern, OID_AUTO, memorystatus_snapshot, CTLTYPE_OPAQUE|CTLFLAG_RD, 0, 0, sysctl_handle_kern_memorystatus_snapshot, "S,jetsam_snapshot", ""); +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 + * . 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 */