kern_memorystatus.c [plain text]
#include <kern/sched_prim.h>
#include <kern/kalloc.h>
#include <kern/assert.h>
#include <kern/debug.h>
#include <kern/lock.h>
#include <kern/task.h>
#include <kern/thread.h>
#include <kern/host.h>
#include <libkern/libkern.h>
#include <mach/mach_time.h>
#include <mach/task.h>
#include <mach/host_priv.h>
#include <mach/mach_host.h>
#include <pexpert/pexpert.h>
#include <sys/kern_event.h>
#include <sys/proc.h>
#include <sys/proc_info.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/sysctl.h>
#include <sys/sysproto.h>
#include <sys/wait.h>
#include <sys/tree.h>
#include <sys/priv.h>
#include <vm/vm_pageout.h>
#include <vm/vm_protos.h>
#if CONFIG_FREEZE
#include <vm/vm_map.h>
#endif
#include <sys/kern_memorystatus.h>
#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
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;
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;
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
};
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);
#if CONFIG_JETSAM
#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;
unsigned int memorystatus_delta = 0;
static unsigned int memorystatus_available_pages = (unsigned int)-1;
static unsigned int memorystatus_available_pages_pressure = 0;
static unsigned int memorystatus_available_pages_critical = 0;
static unsigned int memorystatus_available_pages_critical_base = 0;
static unsigned int memorystatus_last_foreground_pressure_pages = (unsigned int)-1;
#if !LATENCY_JETSAM
static unsigned int memorystatus_available_pages_critical_idle_offset = 0;
#endif
#if DEVELOPMENT || DEBUG
static unsigned int memorystatus_jetsam_panic_debug = 0;
static unsigned int memorystatus_jetsam_policy = kPolicyDefault;
static unsigned int memorystatus_jetsam_policy_offset_pages_diagnostic = 0;
#endif
static boolean_t kill_under_pressure = FALSE;
static memorystatus_jetsam_snapshot_t *memorystatus_jetsam_snapshot;
#define memorystatus_jetsam_snapshot_list memorystatus_jetsam_snapshot->entries
static unsigned int memorystatus_jetsam_snapshot_count = 0;
static unsigned int memorystatus_jetsam_snapshot_max = 0;
static void memorystatus_clear_errors(void);
static void memorystatus_get_task_page_counts(task_t task, uint32_t *footprint, uint32_t *max_footprint);
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);
static boolean_t memorystatus_kill_specific_process(pid_t victim_pid, uint32_t cause);
static boolean_t memorystatus_kill_top_process(boolean_t any, uint32_t cause, int32_t *priority, uint32_t *errors);
#if LEGACY_HIWATER
static boolean_t memorystatus_kill_hiwat_proc(uint32_t *errors);
#endif
static boolean_t memorystatus_kill_process_async(pid_t victim_pid, uint32_t cause);
static boolean_t memorystatus_kill_process_sync(pid_t victim_pid, uint32_t cause);
#endif
#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
#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);
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;
static uint64_t memorystatus_freeze_count = 0;
static uint64_t memorystatus_freeze_pageouts = 0;
static throttle_interval_t throttle_intervals[] = {
{ 60, 8, 0, 0, { 0, 0 }, FALSE },
{ 24 * 60, 1, 0, 0, { 0, 0 }, FALSE },
};
static uint64_t memorystatus_freeze_throttle_count = 0;
static unsigned int memorystatus_suspended_count = 0;
static unsigned int memorystatus_suspended_footprint_total = 0;
#endif
#if DEVELOPMENT || DEBUG
#if CONFIG_JETSAM
static int
sysctl_memorystatus_highwater_enable SYSCTL_HANDLER_ARGS
{
#pragma unused(oidp, arg2)
proc_t p;
unsigned int b = 0;
int error, enable = 0;
int32_t memlimit;
error = SYSCTL_OUT(req, arg1, sizeof(int));
if (error || !req->newptr) {
return (error);
}
error = SYSCTL_IN(req, &enable, sizeof(int));
if (error || !req->newptr) {
return (error);
}
if (!(enable == 0 || enable == 1)) {
return EINVAL;
}
proc_list_lock();
p = memorystatus_get_first_proc_locked(&b, TRUE);
while (p) {
if (enable) {
if ((p->p_memstat_state & P_MEMSTAT_MEMLIMIT_BACKGROUND) && (p->p_memstat_effectivepriority >= JETSAM_PRIORITY_FOREGROUND)) {
memlimit = -1;
} else {
memlimit = p->p_memstat_memlimit;
}
} else {
memlimit = -1;
}
task_set_phys_footprint_limit_internal(p->task, (memlimit > 0) ? memlimit : -1, NULL, TRUE);
p = memorystatus_get_next_proc_locked(&b, p, TRUE);
}
memorystatus_highwater_enabled = enable;
proc_list_unlock();
return 0;
}
SYSCTL_PROC(_kern, OID_AUTO, memorystatus_highwater_enabled, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_highwater_enabled, 0, sysctl_memorystatus_highwater_enable, "I", "");
SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages, CTLFLAG_RD|CTLFLAG_LOCKED, &memorystatus_available_pages, 0, "");
SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical, CTLFLAG_RD|CTLFLAG_LOCKED, &memorystatus_available_pages_critical, 0, "");
SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical_base, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_available_pages_critical_base, 0, "");
#if !LATENCY_JETSAM
SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_critical_idle_offset, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_available_pages_critical_idle_offset, 0, "");
#endif
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
{
#pragma unused(arg1, arg2)
const char *diagnosticStrings[] = {
"jetsam: diagnostic mode: resetting critical level.",
"jetsam: diagnostic mode: will examine all processes",
"jetsam: diagnostic mode: will stop at first active process"
};
int error, val = jetsam_diagnostic_mode;
boolean_t changed = FALSE;
error = sysctl_handle_int(oidp, &val, 0, req);
if (error || !req->newptr)
return (error);
if ((val < 0) || (val >= kJetsamDiagnosticModeCount)) {
printf("jetsam: diagnostic mode: invalid value - %d\n", val);
return EINVAL;
}
proc_list_lock();
if ((unsigned int) val != jetsam_diagnostic_mode) {
jetsam_diagnostic_mode = val;
memorystatus_jetsam_policy &= ~kPolicyDiagnoseActive;
switch (jetsam_diagnostic_mode) {
case kJetsamDiagnosticModeNone:
break;
case kJetsamDiagnosticModeAll:
memorystatus_jetsam_policy |= kPolicyDiagnoseAll;
break;
case kJetsamDiagnosticModeStopAtFirstActive:
memorystatus_jetsam_policy |= kPolicyDiagnoseFirst;
break;
default:
break;
}
memorystatus_update_levels_locked(FALSE);
changed = TRUE;
}
proc_list_unlock();
if (changed) {
printf("%s\n", diagnosticStrings[val]);
}
return (0);
}
SYSCTL_PROC(_debug, OID_AUTO, jetsam_diagnostic_mode, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_LOCKED|CTLFLAG_ANYBODY,
&jetsam_diagnostic_mode, 0, sysctl_jetsam_diagnostic_mode, "I", "Jetsam Diagnostic Mode");
SYSCTL_UINT(_kern, OID_AUTO, memorystatus_jetsam_policy_offset_pages_diagnostic, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_jetsam_policy_offset_pages_diagnostic, 0, "");
#if VM_PRESSURE_EVENTS
SYSCTL_UINT(_kern, OID_AUTO, memorystatus_available_pages_pressure, CTLFLAG_RW|CTLFLAG_LOCKED, &memorystatus_available_pages_pressure, 0, "");
static int
sysctl_memorystatus_vm_pressure_level SYSCTL_HANDLER_ARGS
{
#pragma unused(arg1, arg2, oidp)
int error = 0;
error = priv_check_cred(kauth_cred_get(), PRIV_VM_PRESSURE, 0);
if (error)
return (error);
return SYSCTL_OUT(req, &memorystatus_vm_pressure_level, sizeof(memorystatus_vm_pressure_level));
}
SYSCTL_PROC(_kern, OID_AUTO, memorystatus_vm_pressure_level, CTLTYPE_INT|CTLFLAG_RD|CTLFLAG_LOCKED|CTLFLAG_MASKED,
0, 0, &sysctl_memorystatus_vm_pressure_level, "I", "");
static int
sysctl_memorystatus_vm_pressure_send SYSCTL_HANDLER_ARGS
{
#pragma unused(arg1, arg2)
int error, pid = 0;
error = sysctl_handle_int(oidp, &pid, 0, req);
if (error || !req->newptr)
return (error);
return vm_dispatch_pressure_note_to_pid(pid, FALSE);
}
SYSCTL_PROC(_kern, OID_AUTO, memorystatus_vm_pressure_send, CTLTYPE_INT|CTLFLAG_WR|CTLFLAG_LOCKED|CTLFLAG_MASKED,
0, 0, &sysctl_memorystatus_vm_pressure_send, "I", "");
#endif
#endif
#endif
#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, "");
static int
sysctl_memorystatus_freeze SYSCTL_HANDLER_ARGS
{
#pragma unused(arg1, arg2)
int error, pid = 0;
proc_t p;
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;
}
error = task_freeze(p->task, &purgeable, &wired, &clean, &dirty, max_pages, &shared, FALSE);
proc_rele(p);
if (error)
error = EIO;
return error;
}
return EINVAL;
}
SYSCTL_PROC(_kern, OID_AUTO, memorystatus_freeze, CTLTYPE_INT|CTLFLAG_WR|CTLFLAG_LOCKED|CTLFLAG_MASKED,
0, 0, &sysctl_memorystatus_freeze, "I", "");
static int
sysctl_memorystatus_available_pages_thaw SYSCTL_HANDLER_ARGS
{
#pragma unused(arg1, arg2)
int error, pid = 0;
proc_t p;
error = sysctl_handle_int(oidp, &pid, 0, req);
if (error || !req->newptr)
return (error);
p = proc_find(pid);
if (p != NULL) {
error = task_thaw(p->task);
proc_rele(p);
if (error)
error = EIO;
return error;
}
return EINVAL;
}
SYSCTL_PROC(_kern, OID_AUTO, memorystatus_thaw, CTLTYPE_INT|CTLFLAG_WR|CTLFLAG_LOCKED|CTLFLAG_MASKED,
0, 0, &sysctl_memorystatus_available_pages_thaw, "I", "");
#endif
extern kern_return_t kernel_thread_start_priority(thread_continue_t continuation,
void *parameter,
integer_t priority,
thread_t *new_thread);
static proc_t memorystatus_get_first_proc_locked(unsigned int *bucket_index, boolean_t search) {
memstat_bucket_t *current_bucket;
proc_t next_p;
if ((*bucket_index) >= MEMSTAT_BUCKET_COUNT) {
return NULL;
}
current_bucket = &memstat_bucket[*bucket_index];
next_p = TAILQ_FIRST(¤t_bucket->list);
if (!next_p && search) {
while (!next_p && (++(*bucket_index) < MEMSTAT_BUCKET_COUNT)) {
current_bucket = &memstat_bucket[*bucket_index];
next_p = TAILQ_FIRST(¤t_bucket->list);
}
}
return next_p;
}
static proc_t memorystatus_get_next_proc_locked(unsigned int *bucket_index, proc_t p, boolean_t search) {
memstat_bucket_t *current_bucket;
proc_t next_p;
if (!p || ((*bucket_index) >= MEMSTAT_BUCKET_COUNT)) {
return NULL;
}
next_p = TAILQ_NEXT(p, p_memstat_list);
while (!next_p && search && (++(*bucket_index) < MEMSTAT_BUCKET_COUNT)) {
current_bucket = &memstat_bucket[*bucket_index];
next_p = TAILQ_FIRST(¤t_bucket->list);
}
return next_p;
}
__private_extern__ void
memorystatus_init(void)
{
thread_t thread = THREAD_NULL;
kern_return_t result;
int i;
nanoseconds_to_absolutetime((uint64_t)DEFERRED_IDLE_EXIT_TIME_SECS * NSEC_PER_SEC, &memorystatus_idle_delay_time);
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);
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
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");
}
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 , &thread);
if (result == KERN_SUCCESS) {
thread_deallocate(thread);
} else {
panic("Could not create memorystatus_thread");
}
}
extern void
vm_wake_compactor_swapper(void);
static boolean_t
memorystatus_do_kill(proc_t p, uint32_t cause) {
int retval = 0;
#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
if (memorystatus_jetsam_panic_debug & (1 << cause)) {
panic("memorystatus_do_kill(): jetsam debug panic (cause: %d)", cause);
}
#else
#pragma unused(cause)
#endif
int jetsam_flags = P_LTERM_JETSAM;
switch (cause) {
case kMemorystatusKilledHiwat: jetsam_flags |= P_JETSAM_HIWAT; break;
case kMemorystatusKilledVnodes: jetsam_flags |= P_JETSAM_VNODE; break;
case kMemorystatusKilledVMPageShortage: jetsam_flags |= P_JETSAM_VMPAGESHORTAGE; break;
case kMemorystatusKilledVMThrashing: jetsam_flags |= P_JETSAM_VMTHRASHING; break;
case 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);
if (COMPRESSED_PAGER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) {
vm_wake_compactor_swapper();
}
return (retval == 0);
}
static void
memorystatus_check_levels_locked(void) {
#if CONFIG_JETSAM
memorystatus_update_levels_locked(TRUE);
#endif
}
static void
memorystatus_perform_idle_demotion(__unused void *spare1, __unused void *spare2)
{
proc_t p;
uint64_t current_time;
memstat_bucket_t *demotion_bucket;
MEMORYSTATUS_DEBUG(1, "memorystatus_perform_idle_demotion()\n");
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_IDLE_DEMOTE) | DBG_FUNC_START, 0, 0, 0, 0, 0);
current_time = mach_absolute_time();
proc_list_lock();
demotion_bucket = &memstat_bucket[JETSAM_PRIORITY_IDLE_DEFERRED];
p = TAILQ_FIRST(&demotion_bucket->list);
while (p) {
MEMORYSTATUS_DEBUG(1, "memorystatus_perform_idle_demotion() found %d\n", p->p_pid);
assert(p->p_memstat_idledeadline);
assert(p->p_memstat_dirty & P_DIRTY_DEFER_IN_PROGRESS);
assert((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_IS_DIRTY)) == P_DIRTY_IDLE_EXIT_ENABLED);
if (current_time >= p->p_memstat_idledeadline) {
#if DEBUG || DEVELOPMENT
if (!(p->p_memstat_dirty & P_DIRTY_MARKED)) {
printf("memorystatus_perform_idle_demotion: moving process %d 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);
p = TAILQ_FIRST(&demotion_bucket->list);
continue;
}
break;
}
memorystatus_reschedule_idle_demotion_locked();
proc_list_unlock();
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_IDLE_DEMOTE) | DBG_FUNC_END, 0, 0, 0, 0, 0);
}
static void
memorystatus_schedule_idle_demotion_locked(proc_t p, boolean_t set_state)
{
MEMORYSTATUS_DEBUG(1, "memorystatus_schedule_idle_demotion_locked: scheduling demotion to idle band for process %d (dirty:0x%x, set_state %d, demotions %d).\n",
p->p_pid, p->p_memstat_dirty, set_state, memorystatus_scheduled_idle_demotions);
assert((p->p_memstat_dirty & (P_DIRTY_IDLE_EXIT_ENABLED|P_DIRTY_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) {
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;
}
}
}
int
memorystatus_add(proc_t p, boolean_t locked)
{
memstat_bucket_t *bucket;
MEMORYSTATUS_DEBUG(1, "memorystatus_list_add(): adding process %d with priority %d.\n", p->pid, priority);
if (!locked) {
proc_list_lock();
}
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++;
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);
if ((p->p_listflag & P_LIST_EXITED) != 0) {
return;
}
MEMORYSTATUS_DEBUG(1, "memorystatus_update_priority_locked(): setting process %d to priority %d\n", p->p_pid, priority);
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);
}
}
#endif
p->p_memstat_effectivepriority = priority;
memorystatus_check_levels_locked();
}
int
memorystatus_update(proc_t p, int priority, uint64_t user_data, boolean_t effective, boolean_t update_memlimit, int32_t memlimit, boolean_t memlimit_background)
{
int ret;
#if !CONFIG_JETSAM
#pragma unused(update_memlimit, memlimit, memlimit_background)
#endif
MEMORYSTATUS_DEBUG(1, "memorystatus_update: changing process %d: priority %d, user_data 0x%llx\n", p->p_pid, priority, user_data);
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_MEMSTAT, BSD_MEMSTAT_UPDATE) | DBG_FUNC_START, p->p_pid, priority, user_data, effective, 0);
if (priority == -1) {
priority = JETSAM_PRIORITY_DEFAULT;
} else if (priority == JETSAM_PRIORITY_IDLE_DEFERRED) {
priority = JETSAM_PRIORITY_IDLE;
} else if ((priority < 0) || (priority >= MEMSTAT_BUCKET_COUNT)) {
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) {
p->p_memstat_state |= P_MEMSTAT_MEMLIMIT_BACKGROUND;
} else {
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 (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) {
if (target_p->p_memstat_dirty & P_DIRTY_TERMINATED) {
return FALSE;
}
if ((pcontrol & PROC_DIRTY_ALLOW_IDLE_EXIT) &&
!(pcontrol & PROC_DIRTY_TRACK)) {
return FALSE;
}
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);
}
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;
if (pcontrol & PROC_DIRTY_TRACK) {
p->p_memstat_dirty |= P_DIRTY_TRACK;
}
if (pcontrol & PROC_DIRTY_ALLOW_IDLE_EXIT) {
p->p_memstat_dirty |= P_DIRTY_ALLOW_IDLE_EXIT;
}
if ((pcontrol & PROC_DIRTY_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);
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)) {
ret = EINVAL;
} else if (pcontrol && (p->p_memstat_dirty & P_DIRTY_TERMINATED)) {
ret = EBUSY;
} else {
int flag = (self == TRUE) ? P_DIRTY : P_DIRTY_SHUTDOWN;
if (pcontrol && !(p->p_memstat_dirty & flag)) {
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)) {
p->p_memstat_dirty |= P_DIRTY_TERMINATED;
kill = true;
} else if ((flag == P_DIRTY) && (p->p_memstat_dirty & P_DIRTY_TERMINATED)) {
kill = true;
}
p->p_memstat_dirty &= ~flag;
memorystatus_dirty_count--;
ret = 0;
} else {
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)) {
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 {
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 (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) {
sig = SIGKILL;
} else {
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
thread_wakeup((event_t)&memorystatus_freeze_wakeup);
#endif
}
static uint32_t
memorystatus_build_state(proc_t p) {
uint32_t snapshot_state = 0;
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;
}
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;
current_time = mach_absolute_time();
proc_list_lock();
p = memorystatus_get_first_proc_locked(&i, FALSE);
while (p) {
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) {
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;
#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
killed = memorystatus_kill_hiwat_proc(&errors);
if (killed) {
post_snapshot = TRUE;
goto done;
}
#endif
killed = memorystatus_kill_top_process(TRUE, cause, &priority, &errors);
if (killed) {
if (!kill_under_pressure && (priority != JETSAM_PRIORITY_IDLE)) {
post_snapshot = TRUE;
}
goto done;
}
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);
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) {
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
if (kill_idle_exit) {
kill_idle_exit_proc();
kill_idle_exit = FALSE;
}
#endif
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
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) {
printf("task_exceeded_footprint: failed to warn the current task (exiting?).\n");
}
return;
}
#endif
if (p->p_memstat_memlimit <= 0) {
if (memorystatus_kill_process_sync(p->p_pid, kMemorystatusKilledPerProcessLimit) != TRUE) {
printf("task_exceeded_footprint: failed to kill the current task (exiting?).\n");
}
}
}
static void
memorystatus_get_task_page_counts(task_t task, uint32_t *footprint, uint32_t *max_footprint)
{
assert(task);
assert(footprint);
*footprint = (uint32_t)(get_task_phys_footprint(task) / PAGE_SIZE_64);
if (max_footprint) {
*max_footprint = (uint32_t)(get_task_phys_footprint_max(task) / PAGE_SIZE_64);
}
}
static int
memorystatus_send_note(int event_code, void *data, size_t data_length) {
int ret;
struct kev_msg ev_msg;
ev_msg.vendor_code = KEV_VENDOR_APPLE;
ev_msg.kev_class = KEV_SYSTEM_CLASS;
ev_msg.kev_subclass = KEV_MEMORYSTATUS_SUBCLASS;
ev_msg.event_code = event_code;
ev_msg.dv[0].data_length = data_length;
ev_msg.dv[0].data_ptr = data;
ev_msg.dv[1].data_length = 0;
ret = kev_post_msg(&ev_msg);
if (ret) {
printf("%s: kev_post_msg() failed, err %d\n", __func__, ret);
}
return ret;
}
static void
memorystatus_update_snapshot_locked(proc_t p, uint32_t kill_cause)
{
unsigned int i;
for (i = 0; i < memorystatus_jetsam_snapshot_count; i++) {
if (memorystatus_jetsam_snapshot_list[i].pid == p->p_pid) {
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
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;
}
memorystatus_jetsam_panic_debug = (memorystatus_jetsam_panic_debug & ~debug.mask) | (debug.data & debug.mask);
debug.data = memorystatus_jetsam_panic_debug;
ret = copyout(&debug, buffer, sizeof(memorystatus_jetsam_panic_options_t));
return ret;
}
#endif
static boolean_t
memorystatus_kill_specific_process(pid_t victim_pid, uint32_t cause) {
boolean_t killed;
proc_t p;
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;
}
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
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
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
#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;
}
if ((memorystatus_jetsam_snapshot_count == 0) &&
((!priority) || (priority && (*priority != JETSAM_PRIORITY_IDLE)))) {
memorystatus_jetsam_snapshot_procs_locked();
new_snapshot = TRUE;
}
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
{
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);
}
if (killed) {
proc_rele(p);
goto exit;
}
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:
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;
}
if (p->p_memstat_memlimit <= 0) {
continue;
}
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
#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
{
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);
}
if (killed) {
proc_rele(p);
goto exit;
}
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:
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
static boolean_t
memorystatus_kill_process_async(pid_t victim_pid, uint32_t cause) {
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) {
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) {
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
#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;
if ((state & (P_MEMSTAT_TERMINATED | P_MEMSTAT_LOCKED | P_MEMSTAT_FROZEN)) || !(state & P_MEMSTAT_SUSPENDED)) {
continue; }
memorystatus_get_task_page_counts(p->task, &pages, NULL);
if (pages < memorystatus_freeze_pages_min) {
continue; }
if (DEFAULT_FREEZER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) {
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;
}
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;
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));
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));
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;
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 (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)
{
if (memorystatus_available_pages > memorystatus_freeze_threshold) {
return FALSE;
}
if (!memorystatus_can_freeze_processes()) {
return FALSE;
}
if (*memorystatus_freeze_swap_low) {
if (default_pager_swap_pages_free() < memorystatus_freeze_pages_min) {
return FALSE;
}
*memorystatus_freeze_swap_low = FALSE;
}
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);
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;
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)) {
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++;
}
}
}
assert_wait((event_t) &memorystatus_freeze_wakeup, THREAD_UNINT);
thread_block((thread_continue_t) memorystatus_freeze_thread);
}
#endif
#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) {
new_level = kVMPressureNormal;
}
#if CONFIG_FREEZE
else if (memorystatus_frozen_count > 0) {
new_level = kVMPressureNormal;
}
#endif
else if (memorystatus_suspended_count > MEMORYSTATUS_SUSPENDED_THRESHOLD) {
new_level = kVMPressureNormal;
}
else if (memorystatus_suspended_count > 0) {
new_level = kVMPressureWarning;
}
else {
new_level = kVMPressureUrgent;
}
*pressured = (new_level != kVMPressureNormal);
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;
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();
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");
vm_find_pressure_candidate();
}
}
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);
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
#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)
void memorystatus_on_pageout_scan_end(void) {
}
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) {
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();
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) {
memorystatus_idle_exit_from_VM();
if ((vm_pressure_notify_dispatch_vm_clients() == KERN_FAILURE) && (kn_max == NULL)) {
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;
}
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;
switch (trigger_request) {
case TEST_PURGEABLE_TRIGGER_ONE:
case TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ONE:
if (force_purge == 0) {
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) {
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
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;
if (size_only) {
return 0;
}
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
{
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;
}
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;
int error;
uint32_t i;
uint32_t entry_count;
memorystatus_priority_properties_t *entries;
if ((pid == 0) || (buffer == USER_ADDR_NULL) || (buffer_size == 0)) {
return EINVAL;
}
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;
error = priv_check_cred(kauth_cred_get(), PRIV_VM_PRESSURE, 0);
if (error) {
return (error);
}
*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;
}
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
int
memorystatus_control(struct proc *p __unused, struct memorystatus_control_args *args, int *ret) {
int error = EINVAL;
#if !CONFIG_JETSAM
#pragma unused(ret)
#endif
if (!kauth_cred_issuser(kauth_cred_get())) {
error = EPERM;
goto out;
}
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:
error = memorystatus_cmd_set_jetsam_high_water_mark(args->pid, (int32_t)args->flags, ret);
break;
#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
#endif
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
error = priv_check_cred(kauth_cred_get(), PRIV_VM_PRESSURE, 0);
#endif
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