#include <ipc/ipc_types.h>
#include <ipc/ipc_space.h>
#include <ipc/ipc_entry.h>
+#include <ipc/ipc_hash.h>
#include <kern/kern_types.h>
#include <kern/mach_param.h>
#include <kern/assert.h>
#include <kern/sync_lock.h>
#include <kern/affinity.h>
+#include <kern/exc_resource.h>
+#if CONFIG_TELEMETRY
+#include <kern/telemetry.h>
+#endif
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h> /* for kernel_map, ipc_kernel_map */
#include <vm/vm_pageout.h>
#include <vm/vm_protos.h>
+#include <vm/vm_purgeable_internal.h>
+#include <sys/resource.h>
/*
* Exported interfaces
*/
#include <pmc/pmc.h>
#endif /* CONFIG_COUNTERS */
+#include <libkern/OSDebug.h>
+#include <libkern/OSAtomic.h>
+
task_t kernel_task;
zone_t task_zone;
lck_attr_t task_lck_attr;
lck_grp_t task_lck_grp;
lck_grp_attr_t task_lck_grp_attr;
-#if CONFIG_EMBEDDED
-lck_mtx_t task_watch_mtx;
-#endif /* CONFIG_EMBEDDED */
+
+/* Flag set by core audio when audio is playing. Used to stifle EXC_RESOURCE generation when active. */
+int audio_active = 0;
zinfo_usage_store_t tasks_tkm_private;
zinfo_usage_store_t tasks_tkm_shared;
+/* A container to accumulate statistics for expired tasks */
+expired_task_statistics_t dead_task_statistics;
+lck_spin_t dead_task_statistics_lock;
+
static ledger_template_t task_ledger_template = NULL;
-struct _task_ledger_indices task_ledgers = {-1, -1, -1, -1, -1};
+struct _task_ledger_indices task_ledgers __attribute__((used)) = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
void init_task_ledgers(void);
+void task_footprint_exceeded(int warning, __unused const void *param0, __unused const void *param1);
+void task_wakeups_rate_exceeded(int warning, __unused const void *param0, __unused const void *param1);
+void __attribute__((noinline)) THIS_PROCESS_IS_CAUSING_TOO_MANY_WAKEUPS__SENDING_EXC_RESOURCE(void);
+void __attribute__((noinline)) THIS_PROCESS_CROSSED_HIGH_WATERMARK__SENDING_EXC_RESOURCE(int max_footprint_mb);
+int coredump(void *core_proc, int reserve_mb, int ignore_ulimit);
+
+kern_return_t task_suspend_internal(task_t);
+kern_return_t task_resume_internal(task_t);
+
+void proc_init_cpumon_params(void);
+
+// Warn tasks when they hit 80% of their memory limit.
+#define PHYS_FOOTPRINT_WARNING_LEVEL 80
+
+#define TASK_WAKEUPS_MONITOR_DEFAULT_LIMIT 150 /* wakeups per second */
+#define TASK_WAKEUPS_MONITOR_DEFAULT_INTERVAL 300 /* in seconds. */
+/*
+ * Level (in terms of percentage of the limit) at which the wakeups monitor triggers telemetry.
+ *
+ * (ie when the task's wakeups rate exceeds 70% of the limit, start taking user
+ * stacktraces, aka micro-stackshots)
+ */
+#define TASK_WAKEUPS_MONITOR_DEFAULT_USTACKSHOTS_TRIGGER 70
+
+int task_wakeups_monitor_interval; /* In seconds. Time period over which wakeups rate is observed */
+int task_wakeups_monitor_rate; /* In hz. Maximum allowable wakeups per task before EXC_RESOURCE is sent */
+int task_wakeups_monitor_ustackshots_trigger_pct; /* Percentage. Level at which we start gathering telemetry. */
+
+int disable_exc_resource; /* Global override to supress EXC_RESOURCE for resource monitor violations. */
+
+int max_task_footprint = 0; /* Per-task limit on physical memory consumption */
int task_max = CONFIG_TASK_MAX; /* Max number of tasks */
-/* externs for BSD kernel */
-extern void proc_getexecutableuuid(void *, unsigned char *, unsigned long);
+int hwm_user_cores = 0; /* high watermark violations generate user core files */
+
+#ifdef MACH_BSD
+extern void proc_getexecutableuuid(void *, unsigned char *, unsigned long);
+extern int proc_pid(struct proc *p);
+extern int proc_selfpid(void);
+extern char *proc_name_address(struct proc *p);
+#if CONFIG_JETSAM
+extern void memorystatus_on_ledger_footprint_exceeded(int warning, const int max_footprint_mb);
+#endif
+#endif
/* Forwards */
{
#if defined(__i386__) || defined(__x86_64__)
thread_t thread;
-#endif /* __i386__ */
- int vm_flags = 0;
+#endif /* defined(__i386__) || defined(__x86_64__) */
+
+ task_lock(task);
if (is64bit) {
if (task_has_64BitAddr(task))
- return;
-
+ goto out;
task_set_64BitAddr(task);
} else {
if ( !task_has_64BitAddr(task))
- return;
-
- /*
- * Deallocate all memory previously allocated
- * above the 32-bit address space, since it won't
- * be accessible anymore.
- */
- /* remove regular VM map entries & pmap mappings */
- (void) vm_map_remove(task->map,
- (vm_map_offset_t) VM_MAX_ADDRESS,
- MACH_VM_MAX_ADDRESS,
- 0);
- /* remove the higher VM mappings */
- (void) vm_map_remove(task->map,
- MACH_VM_MAX_ADDRESS,
- 0xFFFFFFFFFFFFF000ULL,
- vm_flags);
+ goto out;
task_clear_64BitAddr(task);
}
/* FIXME: On x86, the thread save state flavor can diverge from the
* certain routines may observe the thread as being in an inconsistent
* state with respect to its task's 64-bitness.
*/
+
#if defined(__i386__) || defined(__x86_64__)
- task_lock(task);
queue_iterate(&task->threads, thread, thread_t, task_threads) {
thread_mtx_lock(thread);
machine_thread_switch_addrmode(thread);
thread_mtx_unlock(thread);
}
+#endif /* defined(__i386__) || defined(__x86_64__) */
+
+out:
task_unlock(task);
-#endif /* __i386__ */
}
task_unlock(task);
}
+#if TASK_REFERENCE_LEAK_DEBUG
+#include <kern/btlog.h>
+
+decl_simple_lock_data(static,task_ref_lock);
+static btlog_t *task_ref_btlog;
+#define TASK_REF_OP_INCR 0x1
+#define TASK_REF_OP_DECR 0x2
+
+#define TASK_REF_BTDEPTH 7
+
+static void
+task_ref_lock_lock(void *context)
+{
+ simple_lock((simple_lock_t)context);
+}
+static void
+task_ref_lock_unlock(void *context)
+{
+ simple_unlock((simple_lock_t)context);
+}
+
+void
+task_reference_internal(task_t task)
+{
+ void * bt[TASK_REF_BTDEPTH];
+ int numsaved = 0;
+
+ numsaved = OSBacktrace(bt, TASK_REF_BTDEPTH);
+
+ (void)hw_atomic_add(&(task)->ref_count, 1);
+ btlog_add_entry(task_ref_btlog, task, TASK_REF_OP_INCR,
+ bt, numsaved);
+}
+
+uint32_t
+task_deallocate_internal(task_t task)
+{
+ void * bt[TASK_REF_BTDEPTH];
+ int numsaved = 0;
+
+ numsaved = OSBacktrace(bt, TASK_REF_BTDEPTH);
+
+ btlog_add_entry(task_ref_btlog, task, TASK_REF_OP_DECR,
+ bt, numsaved);
+ return hw_atomic_sub(&(task)->ref_count, 1);
+}
+
+#endif /* TASK_REFERENCE_LEAK_DEBUG */
+
void
task_init(void)
{
lck_grp_init(&task_lck_grp, "task", &task_lck_grp_attr);
lck_attr_setdefault(&task_lck_attr);
lck_mtx_init(&tasks_threads_lock, &task_lck_grp, &task_lck_attr);
-#if CONFIG_EMBEDDED
- lck_mtx_init(&task_watch_mtx, &task_lck_grp, &task_lck_attr);
-#endif /* CONFIG_EMBEDDED */
task_zone = zinit(
sizeof(struct task),
zone_change(task_zone, Z_NOENCRYPT, TRUE);
+ /*
+ * Configure per-task memory limit. The boot arg takes precedence over the
+ * device tree.
+ */
+ if (!PE_parse_boot_argn("max_task_pmem", &max_task_footprint,
+ sizeof (max_task_footprint))) {
+ max_task_footprint = 0;
+ }
+
+ if (max_task_footprint == 0) {
+ /*
+ * No limit was found in boot-args, so go look in the device tree.
+ */
+ if (!PE_get_default("kern.max_task_pmem", &max_task_footprint,
+ sizeof(max_task_footprint))) {
+ max_task_footprint = 0;
+ }
+ }
+
+ if (max_task_footprint != 0) {
+#if CONFIG_JETSAM
+ if (max_task_footprint < 50) {
+ printf("Warning: max_task_pmem %d below minimum.\n",
+ max_task_footprint);
+ max_task_footprint = 50;
+ }
+ printf("Limiting task physical memory footprint to %d MB\n",
+ max_task_footprint);
+ max_task_footprint *= 1024 * 1024; // Convert MB to bytes
+#else
+ printf("Warning: max_task_footprint specified, but jetsam not configured; ignoring.\n");
+#endif
+ }
+
+ if (!PE_parse_boot_argn("hwm_user_cores", &hwm_user_cores,
+ sizeof (hwm_user_cores))) {
+ hwm_user_cores = 0;
+ }
+
+ proc_init_cpumon_params();
+
+ if (!PE_parse_boot_argn("task_wakeups_monitor_rate", &task_wakeups_monitor_rate, sizeof (task_wakeups_monitor_rate))) {
+ task_wakeups_monitor_rate = TASK_WAKEUPS_MONITOR_DEFAULT_LIMIT;
+ }
+
+ if (!PE_parse_boot_argn("task_wakeups_monitor_interval", &task_wakeups_monitor_interval, sizeof (task_wakeups_monitor_interval))) {
+ task_wakeups_monitor_interval = TASK_WAKEUPS_MONITOR_DEFAULT_INTERVAL;
+ }
+
+ if (!PE_parse_boot_argn("task_wakeups_monitor_ustackshots_trigger_pct", &task_wakeups_monitor_ustackshots_trigger_pct,
+ sizeof (task_wakeups_monitor_ustackshots_trigger_pct))) {
+ task_wakeups_monitor_ustackshots_trigger_pct = TASK_WAKEUPS_MONITOR_DEFAULT_USTACKSHOTS_TRIGGER;
+ }
+
+ if (!PE_parse_boot_argn("disable_exc_resource", &disable_exc_resource,
+ sizeof (disable_exc_resource))) {
+ disable_exc_resource = 0;
+ }
+
init_task_ledgers();
+#if TASK_REFERENCE_LEAK_DEBUG
+ simple_lock_init(&task_ref_lock, 0);
+ task_ref_btlog = btlog_create(100000,
+ TASK_REF_BTDEPTH,
+ task_ref_lock_lock,
+ task_ref_lock_unlock,
+ &task_ref_lock);
+ assert(task_ref_btlog);
+#endif
+
/*
* Create the kernel task as the first task.
*/
vm_map_deallocate(kernel_task->map);
kernel_task->map = kernel_map;
-
+ lck_spin_init(&dead_task_statistics_lock, &task_lck_grp, &task_lck_attr);
}
/*
return(KERN_FAILURE);
}
+/*
+ * Task ledgers
+ * ------------
+ *
+ * phys_footprint
+ * Physical footprint: This is the sum of:
+ * + phys_mem [task's resident memory]
+ * + phys_compressed
+ * + iokit_mem
+ *
+ * iokit_mem
+ * IOKit mappings: The total size of all IOKit mappings in this task [regardless of clean/dirty state].
+ *
+ * phys_compressed
+ * Physical compressed: Amount of this task's resident memory which is held by the compressor.
+ * Such memory is no longer actually resident for the task [i.e., resident in its pmap],
+ * and could be either decompressed back into memory, or paged out to storage, depending
+ * on our implementation.
+ */
void
init_task_ledgers(void)
{
"bytes");
task_ledgers.wired_mem = ledger_entry_add(t, "wired_mem", "physmem",
"bytes");
+ task_ledgers.iokit_mem = ledger_entry_add(t, "iokit_mem", "mappings",
+ "bytes");
+ task_ledgers.phys_footprint = ledger_entry_add(t, "phys_footprint", "physmem",
+ "bytes");
+ task_ledgers.phys_compressed = ledger_entry_add(t, "phys_compressed", "physmem",
+ "bytes");
+ task_ledgers.platform_idle_wakeups = ledger_entry_add(t, "platform_idle_wakeups", "power",
+ "count");
+ task_ledgers.interrupt_wakeups = ledger_entry_add(t, "interrupt_wakeups", "power",
+ "count");
if ((task_ledgers.cpu_time < 0) || (task_ledgers.tkm_private < 0) ||
(task_ledgers.tkm_shared < 0) || (task_ledgers.phys_mem < 0) ||
- (task_ledgers.wired_mem < 0)) {
+ (task_ledgers.wired_mem < 0) || (task_ledgers.iokit_mem < 0) ||
+ (task_ledgers.phys_footprint < 0) || (task_ledgers.phys_compressed < 0) ||
+ (task_ledgers.platform_idle_wakeups < 0) || (task_ledgers.interrupt_wakeups < 0)) {
panic("couldn't create entries for task ledger template");
}
+ ledger_track_maximum(t, task_ledgers.phys_footprint, 60);
+
+#if CONFIG_JETSAM
+ ledger_set_callback(t, task_ledgers.phys_footprint, task_footprint_exceeded, NULL, NULL);
+#endif
+
+ ledger_set_callback(t, task_ledgers.interrupt_wakeups,
+ task_wakeups_rate_exceeded, NULL, NULL);
+
task_ledger_template = t;
}
zfree(task_zone, new_task);
return(KERN_RESOURCE_SHORTAGE);
}
+
new_task->ledger = ledger;
/* if inherit_memory is true, parent_task MUST not be NULL */
new_task->thread_count = 0;
new_task->active_thread_count = 0;
new_task->user_stop_count = 0;
- new_task->role = TASK_UNSPECIFIED;
+ new_task->legacy_stop_count = 0;
new_task->active = TRUE;
new_task->halting = FALSE;
new_task->user_data = NULL;
new_task->priv_flags = 0;
new_task->syscalls_unix=0;
new_task->c_switch = new_task->p_switch = new_task->ps_switch = 0;
- new_task->taskFeatures[0] = 0; /* Init task features */
- new_task->taskFeatures[1] = 0; /* Init task features */
+ new_task->t_flags = 0;
+ new_task->importance = 0;
zinfo_task_init(new_task);
new_task->bsd_info = NULL;
#endif /* MACH_BSD */
+#if CONFIG_JETSAM
+ if (max_task_footprint != 0) {
+ ledger_set_limit(ledger, task_ledgers.phys_footprint, max_task_footprint, PHYS_FOOTPRINT_WARNING_LEVEL);
+ }
+#endif
+
+ if (task_wakeups_monitor_rate != 0) {
+ uint32_t flags = WAKEMON_ENABLE | WAKEMON_SET_DEFAULTS;
+ int32_t rate; // Ignored because of WAKEMON_SET_DEFAULTS
+ task_wakeups_monitor_ctl(new_task, &flags, &rate);
+ }
+
#if defined(__i386__) || defined(__x86_64__)
new_task->i386_ldt = 0;
- new_task->task_debug = NULL;
#endif
+ new_task->task_debug = NULL;
queue_init(&new_task->semaphore_list);
- queue_init(&new_task->lock_set_list);
new_task->semaphores_owned = 0;
- new_task->lock_sets_owned = 0;
#if CONFIG_MACF_MACH
new_task->label = labelh_new(1);
new_task->pidsuspended = FALSE;
new_task->frozen = FALSE;
+ new_task->changing_freeze_state = FALSE;
new_task->rusage_cpu_flags = 0;
new_task->rusage_cpu_percentage = 0;
new_task->rusage_cpu_interval = 0;
new_task->rusage_cpu_deadline = 0;
new_task->rusage_cpu_callt = NULL;
- new_task->proc_terminate = 0;
-#if CONFIG_EMBEDDED
- queue_init(&new_task->task_watchers);
- new_task->appstate = TASK_APPSTATE_ACTIVE;
- new_task->num_taskwatchers = 0;
- new_task->watchapplying = 0;
-#endif /* CONFIG_EMBEDDED */
+#if MACH_ASSERT
+ new_task->suspends_outstanding = 0;
+#endif
+
+
+ new_task->low_mem_notified_warn = 0;
+ new_task->low_mem_notified_critical = 0;
+ new_task->purged_memory_warn = 0;
+ new_task->purged_memory_critical = 0;
+ new_task->mem_notify_reserved = 0;
+#if IMPORTANCE_INHERITANCE
+ new_task->imp_receiver = 0;
+ new_task->imp_donor = 0;
+ new_task->imp_reserved = 0;
+ new_task->task_imp_assertcnt = 0;
+ new_task->task_imp_externcnt = 0;
+#endif /* IMPORTANCE_INHERITANCE */
+
+#if defined(__x86_64__)
+ new_task->uexc_range_start = new_task->uexc_range_size = new_task->uexc_handler = 0;
+#endif
+
+ new_task->requested_policy = default_task_requested_policy;
+ new_task->effective_policy = default_task_effective_policy;
+ new_task->pended_policy = default_task_pended_policy;
if (parent_task != TASK_NULL) {
new_task->sec_token = parent_task->sec_token;
task_affinity_create(parent_task, new_task);
new_task->pset_hint = parent_task->pset_hint = task_choose_pset(parent_task);
- new_task->policystate = parent_task->policystate;
- /* inherit the self action state */
- new_task->appliedstate = parent_task->appliedstate;
- new_task->ext_policystate = parent_task->ext_policystate;
-#if NOTYET
- /* till the child lifecycle is cleared do not inherit external action */
- new_task->ext_appliedstate = parent_task->ext_appliedstate;
-#else
- new_task->ext_appliedstate = default_task_null_policy;
-#endif
- }
- else {
+
+#if IMPORTANCE_INHERITANCE
+ new_task->imp_donor = parent_task->imp_donor;
+ /* Embedded doesn't want this to inherit */
+ new_task->imp_receiver = parent_task->imp_receiver;
+#endif /* IMPORTANCE_INHERITANCE */
+
+ new_task->requested_policy.t_apptype = parent_task->requested_policy.t_apptype;
+
+ new_task->requested_policy.int_darwinbg = parent_task->requested_policy.int_darwinbg;
+ new_task->requested_policy.ext_darwinbg = parent_task->requested_policy.ext_darwinbg;
+ new_task->requested_policy.int_iotier = parent_task->requested_policy.int_iotier;
+ new_task->requested_policy.ext_iotier = parent_task->requested_policy.ext_iotier;
+ new_task->requested_policy.int_iopassive = parent_task->requested_policy.int_iopassive;
+ new_task->requested_policy.ext_iopassive = parent_task->requested_policy.ext_iopassive;
+ new_task->requested_policy.bg_iotier = parent_task->requested_policy.bg_iotier;
+ new_task->requested_policy.terminated = parent_task->requested_policy.terminated;
+
+ task_policy_create(new_task, parent_task->requested_policy.t_boosted);
+ } else {
new_task->sec_token = KERNEL_SECURITY_TOKEN;
new_task->audit_token = KERNEL_AUDIT_TOKEN;
#ifdef __LP64__
new_task->all_image_info_size = (mach_vm_size_t)0;
new_task->pset_hint = PROCESSOR_SET_NULL;
- new_task->policystate = default_task_proc_policy;
- new_task->ext_policystate = default_task_proc_policy;
- new_task->appliedstate = default_task_null_policy;
- new_task->ext_appliedstate = default_task_null_policy;
}
if (kernel_task == TASK_NULL) {
new_task->priority = BASEPRI_KERNEL;
new_task->max_priority = MAXPRI_KERNEL;
- }
- else {
+ } else if (proc_get_effective_task_policy(new_task, TASK_POLICY_LOWPRI_CPU)) {
+ new_task->priority = MAXPRI_THROTTLE;
+ new_task->max_priority = MAXPRI_THROTTLE;
+ } else {
new_task->priority = BASEPRI_DEFAULT;
new_task->max_priority = MAXPRI_USER;
}
bzero(&new_task->extmod_statistics, sizeof(new_task->extmod_statistics));
-
+ new_task->task_timer_wakeups_bin_1 = new_task->task_timer_wakeups_bin_2 = 0;
lck_mtx_lock(&tasks_threads_lock);
queue_enter(&tasks, new_task, task_t, tasks);
tasks_count++;
if (vm_backing_store_low && parent_task != NULL)
new_task->priv_flags |= (parent_task->priv_flags&VM_BACKING_STORE_PRIV);
+ new_task->task_volatile_objects = 0;
+
ipc_task_enable(new_task);
*child_task = new_task;
task_deallocate(
task_t task)
{
- ledger_amount_t credit, debit;
+ ledger_amount_t credit, debit, interrupt_wakeups, platform_idle_wakeups;
if (task == TASK_NULL)
return;
lck_mtx_lock(&tasks_threads_lock);
queue_remove(&terminated_tasks, task, task_t, tasks);
+ terminated_tasks_count--;
lck_mtx_unlock(&tasks_threads_lock);
/*
vm_map_deallocate(task->map);
is_release(task->itk_space);
+ ledger_get_entries(task->ledger, task_ledgers.interrupt_wakeups,
+ &interrupt_wakeups, &debit);
+ ledger_get_entries(task->ledger, task_ledgers.platform_idle_wakeups,
+ &platform_idle_wakeups, &debit);
+
+ /* Accumulate statistics for dead tasks */
+ lck_spin_lock(&dead_task_statistics_lock);
+ dead_task_statistics.total_user_time += task->total_user_time;
+ dead_task_statistics.total_system_time += task->total_system_time;
+
+ dead_task_statistics.task_interrupt_wakeups += interrupt_wakeups;
+ dead_task_statistics.task_platform_idle_wakeups += platform_idle_wakeups;
+
+ dead_task_statistics.task_timer_wakeups_bin_1 += task->task_timer_wakeups_bin_1;
+ dead_task_statistics.task_timer_wakeups_bin_2 += task->task_timer_wakeups_bin_2;
+
+ lck_spin_unlock(&dead_task_statistics_lock);
lck_mtx_destroy(&task->lock, &task_lck_grp);
#if CONFIG_MACF_MACH
}
ledger_dereference(task->ledger);
zinfo_task_free(task);
+
+#if TASK_REFERENCE_LEAK_DEBUG
+ btlog_remove_entries_for_element(task_ref_btlog, task);
+#endif
+
+ if (task->task_volatile_objects) {
+ /*
+ * This task still "owns" some volatile VM objects.
+ * Disown them now to avoid leaving them pointing back at
+ * an invalid task.
+ */
+ vm_purgeable_disown(task);
+ assert(task->task_volatile_objects == 0);
+ }
+
zfree(task_zone, task);
}
return(task_deallocate((task_t)task_name));
}
+/*
+ * task_suspension_token_deallocate:
+ *
+ * Drop a reference on a task suspension token.
+ */
+void
+task_suspension_token_deallocate(
+ task_suspension_token_t token)
+{
+ return(task_deallocate((task_t)token));
+}
/*
* task_terminate:
return (KERN_FAILURE);
}
+#if MACH_ASSERT
+ if (task->suspends_outstanding != 0) {
+ printf("WARNING: %s (%d) exiting with %d outstanding suspensions\n",
+ proc_name_address(task->bsd_info), proc_pid(task->bsd_info),
+ task->suspends_outstanding);
+ }
+#endif
+
if (self_task != task)
task_unlock(self_task);
task->active = FALSE;
ipc_task_disable(task);
+#if CONFIG_TELEMETRY
+ /*
+ * Notify telemetry that this task is going away.
+ */
+ telemetry_task_ctl_locked(task, TF_TELEMETRY, 0);
+#endif
+
/*
* Terminate each thread in the task.
*/
task_unlock(task);
-#if CONFIG_EMBEDDED
- /*
- * remove all task watchers
- */
- task_removewatchers(task);
-#endif /* CONFIG_EMBEDDED */
/*
* Destroy all synchronizers owned by the task.
queue_remove(&tasks, task, task_t, tasks);
queue_enter(&terminated_tasks, task, task_t, tasks);
tasks_count--;
+ terminated_tasks_count++;
lck_mtx_unlock(&tasks_threads_lock);
/*
return (KERN_SUCCESS);
}
+#define TASK_HOLD_NORMAL 0
+#define TASK_HOLD_PIDSUSPEND 1
+#define TASK_HOLD_LEGACY 2
+#define TASK_HOLD_LEGACY_ALL 3
+
static kern_return_t
place_task_hold (
- register task_t task)
+ register task_t task,
+ int mode)
{
if (!task->active) {
return (KERN_FAILURE);
}
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ MACHDBG_CODE(DBG_MACH_IPC,MACH_TASK_SUSPEND) | DBG_FUNC_NONE,
+ proc_pid(task->bsd_info), ((thread_t)queue_first(&task->threads))->thread_id,
+ task->user_stop_count, task->user_stop_count + 1, 0);
+
+#if MACH_ASSERT
+ current_task()->suspends_outstanding++;
+#endif
+
+ if (mode == TASK_HOLD_LEGACY)
+ task->legacy_stop_count++;
+
if (task->user_stop_count++ > 0) {
/*
* If the stop count was positive, the task is
* to stop executing user code.
*/
task_hold_locked(task);
- task_wait_locked(task, TRUE);
+ task_wait_locked(task, FALSE);
return (KERN_SUCCESS);
}
static kern_return_t
release_task_hold (
register task_t task,
- boolean_t pidresume)
+ int mode)
{
register boolean_t release = FALSE;
return (KERN_FAILURE);
}
- if (pidresume) {
+ if (mode == TASK_HOLD_PIDSUSPEND) {
if (task->pidsuspended == FALSE) {
- return (KERN_FAILURE);
+ return (KERN_FAILURE);
}
task->pidsuspended = FALSE;
}
- if (task->user_stop_count > (task->pidsuspended ? 1 : 0)) {
- if (--task->user_stop_count == 0) {
- release = TRUE;
+ if (task->user_stop_count > (task->pidsuspended ? 1 : 0)) {
+
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ MACHDBG_CODE(DBG_MACH_IPC,MACH_TASK_RESUME) | DBG_FUNC_NONE,
+ proc_pid(task->bsd_info), ((thread_t)queue_first(&task->threads))->thread_id,
+ task->user_stop_count, mode, task->legacy_stop_count);
+
+#if MACH_ASSERT
+ /*
+ * This is obviously not robust; if we suspend one task and then resume a different one,
+ * we'll fly under the radar. This is only meant to catch the common case of a crashed
+ * or buggy suspender.
+ */
+ current_task()->suspends_outstanding--;
+#endif
+
+ if (mode == TASK_HOLD_LEGACY_ALL) {
+ if (task->legacy_stop_count >= task->user_stop_count) {
+ task->user_stop_count = 0;
+ release = TRUE;
+ } else {
+ task->user_stop_count -= task->legacy_stop_count;
+ }
+ task->legacy_stop_count = 0;
+ } else {
+ if (mode == TASK_HOLD_LEGACY && task->legacy_stop_count > 0)
+ task->legacy_stop_count--;
+ if (--task->user_stop_count == 0)
+ release = TRUE;
}
}
else {
return (KERN_SUCCESS);
}
+
/*
* task_suspend:
*
- * Implement a user-level suspension on a task.
+ * Implement an (old-fashioned) user-level suspension on a task.
+ *
+ * Because the user isn't expecting to have to manage a suspension
+ * token, we'll track it for him in the kernel in the form of a naked
+ * send right to the task's resume port. All such send rights
+ * account for a single suspension against the task (unlike task_suspend2()
+ * where each caller gets a unique suspension count represented by a
+ * unique send-once right).
*
* Conditions:
* The caller holds a reference to the task
task_suspend(
register task_t task)
{
- kern_return_t kr;
-
+ kern_return_t kr;
+ mach_port_t port, send, old_notify;
+ mach_port_name_t name;
+
if (task == TASK_NULL || task == kernel_task)
return (KERN_INVALID_ARGUMENT);
task_lock(task);
- kr = place_task_hold(task);
+ /*
+ * Claim a send right on the task resume port, and request a no-senders
+ * notification on that port (if none outstanding).
+ */
+ if (task->itk_resume == IP_NULL) {
+ task->itk_resume = ipc_port_alloc_kernel();
+ if (!IP_VALID(task->itk_resume))
+ panic("failed to create resume port");
+ ipc_kobject_set(task->itk_resume, (ipc_kobject_t)task, IKOT_TASK_RESUME);
+ }
+
+ port = task->itk_resume;
+ ip_lock(port);
+ assert(ip_active(port));
+
+ send = ipc_port_make_send_locked(port);
+ assert(IP_VALID(send));
+
+ if (port->ip_nsrequest == IP_NULL) {
+ ipc_port_nsrequest(port, port->ip_mscount, ipc_port_make_sonce_locked(port), &old_notify);
+ assert(old_notify == IP_NULL);
+ /* port unlocked */
+ } else {
+ ip_unlock(port);
+ }
+
+ /*
+ * place a legacy hold on the task.
+ */
+ kr = place_task_hold(task, TASK_HOLD_LEGACY);
+ if (kr != KERN_SUCCESS) {
+ task_unlock(task);
+ ipc_port_release_send(send);
+ return kr;
+ }
task_unlock(task);
+ /*
+ * Copyout the send right into the calling task's IPC space. It won't know it is there,
+ * but we'll look it up when calling a traditional resume. Any IPC operations that
+ * deallocate the send right will auto-release the suspension.
+ */
+ if ((kr = ipc_kmsg_copyout_object(current_task()->itk_space, (ipc_object_t)send,
+ MACH_MSG_TYPE_MOVE_SEND, &name)) != KERN_SUCCESS) {
+ printf("warning: %s(%d) failed to copyout suspension token for task %s(%d) with error: %d\n",
+ proc_name_address(current_task()->bsd_info), proc_pid(current_task()->bsd_info),
+ proc_name_address(task->bsd_info), proc_pid(task->bsd_info), kr);
+ return (kr);
+ }
+
return (kr);
}
/*
* task_resume:
- * Release a kernel hold on a task.
+ * Release a user hold on a task.
*
* Conditions:
* The caller holds a reference to the task
register task_t task)
{
kern_return_t kr;
+ mach_port_name_t resume_port_name;
+ ipc_entry_t resume_port_entry;
+ ipc_space_t space = current_task()->itk_space;
+
+ if (task == TASK_NULL || task == kernel_task )
+ return (KERN_INVALID_ARGUMENT);
+
+ /* release a legacy task hold */
+ task_lock(task);
+ kr = release_task_hold(task, TASK_HOLD_LEGACY);
+ task_unlock(task);
+
+ is_write_lock(space);
+ if (is_active(space) && IP_VALID(task->itk_resume) &&
+ ipc_hash_lookup(space, (ipc_object_t)task->itk_resume, &resume_port_name, &resume_port_entry) == TRUE) {
+ /*
+ * We found a suspension token in the caller's IPC space. Release a send right to indicate that
+ * we are holding one less legacy hold on the task from this caller. If the release failed,
+ * go ahead and drop all the rights, as someone either already released our holds or the task
+ * is gone.
+ */
+ if (kr == KERN_SUCCESS)
+ ipc_right_dealloc(space, resume_port_name, resume_port_entry);
+ else
+ ipc_right_destroy(space, resume_port_name, resume_port_entry, FALSE, 0);
+ /* space unlocked */
+ } else {
+ is_write_unlock(space);
+ if (kr == KERN_SUCCESS)
+ printf("warning: %s(%d) performed out-of-band resume on %s(%d)\n",
+ proc_name_address(current_task()->bsd_info), proc_pid(current_task()->bsd_info),
+ proc_name_address(task->bsd_info), proc_pid(task->bsd_info));
+ }
+
+ return kr;
+}
+/*
+ * Suspend the target task.
+ * Making/holding a token/reference/port is the callers responsibility.
+ */
+kern_return_t
+task_suspend_internal(task_t task)
+{
+ kern_return_t kr;
+
if (task == TASK_NULL || task == kernel_task)
return (KERN_INVALID_ARGUMENT);
task_lock(task);
+ kr = place_task_hold(task, TASK_HOLD_NORMAL);
+ task_unlock(task);
+ return (kr);
+}
+
+/*
+ * Suspend the target task, and return a suspension token. The token
+ * represents a reference on the suspended task.
+ */
+kern_return_t
+task_suspend2(
+ register task_t task,
+ task_suspension_token_t *suspend_token)
+{
+ kern_return_t kr;
+
+ kr = task_suspend_internal(task);
+ if (kr != KERN_SUCCESS) {
+ *suspend_token = TASK_NULL;
+ return (kr);
+ }
+
+ /*
+ * Take a reference on the target task and return that to the caller
+ * as a "suspension token," which can be converted into an SO right to
+ * the now-suspended task's resume port.
+ */
+ task_reference_internal(task);
+ *suspend_token = task;
- kr = release_task_hold(task, FALSE);
+ return (KERN_SUCCESS);
+}
+
+/*
+ * Resume the task
+ * (reference/token/port management is caller's responsibility).
+ */
+kern_return_t
+task_resume_internal(
+ register task_suspension_token_t task)
+{
+ kern_return_t kr;
+ if (task == TASK_NULL || task == kernel_task)
+ return (KERN_INVALID_ARGUMENT);
+
+ task_lock(task);
+ kr = release_task_hold(task, TASK_HOLD_NORMAL);
task_unlock(task);
+ return (kr);
+}
+
+/*
+ * Resume the task using a suspension token. Consumes the token's ref.
+ */
+kern_return_t
+task_resume2(
+ register task_suspension_token_t task)
+{
+ kern_return_t kr;
+
+ kr = task_resume_internal(task);
+ task_suspension_token_deallocate(task);
return (kr);
}
+boolean_t
+task_suspension_notify(mach_msg_header_t *request_header)
+{
+ ipc_port_t port = (ipc_port_t) request_header->msgh_remote_port;
+ task_t task = convert_port_to_task_suspension_token(port);
+ mach_msg_type_number_t not_count;
+
+ if (task == TASK_NULL || task == kernel_task)
+ return TRUE; /* nothing to do */
+
+ switch (request_header->msgh_id) {
+
+ case MACH_NOTIFY_SEND_ONCE:
+ /* release the hold held by this specific send-once right */
+ task_lock(task);
+ release_task_hold(task, TASK_HOLD_NORMAL);
+ task_unlock(task);
+ break;
+
+ case MACH_NOTIFY_NO_SENDERS:
+ not_count = ((mach_no_senders_notification_t *)request_header)->not_count;
+
+ task_lock(task);
+ ip_lock(port);
+ if (port->ip_mscount == not_count) {
+
+ /* release all the [remaining] outstanding legacy holds */
+ assert(port->ip_nsrequest == IP_NULL);
+ ip_unlock(port);
+ release_task_hold(task, TASK_HOLD_LEGACY_ALL);
+ task_unlock(task);
+
+ } else if (port->ip_nsrequest == IP_NULL) {
+ ipc_port_t old_notify;
+
+ task_unlock(task);
+ /* new send rights, re-arm notification at current make-send count */
+ ipc_port_nsrequest(port, port->ip_mscount, ipc_port_make_sonce_locked(port), &old_notify);
+ assert(old_notify == IP_NULL);
+ /* port unlocked */
+ } else {
+ ip_unlock(port);
+ task_unlock(task);
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ task_suspension_token_deallocate(task); /* drop token reference */
+ return TRUE;
+}
+
kern_return_t
task_pidsuspend_locked(task_t task)
{
task->pidsuspended = TRUE;
- kr = place_task_hold(task);
+ kr = place_task_hold(task, TASK_HOLD_PIDSUSPEND);
if (kr != KERN_SUCCESS) {
task->pidsuspended = FALSE;
}
register task_t task)
{
kern_return_t kr;
-#if (CONFIG_FREEZE && THAW_ON_RESUME)
- boolean_t frozen;
-#endif
if (task == TASK_NULL || task == kernel_task)
return (KERN_INVALID_ARGUMENT);
task_lock(task);
#if (CONFIG_FREEZE && THAW_ON_RESUME)
- frozen = task->frozen;
- task->frozen = FALSE;
+
+ while (task->changing_freeze_state) {
+
+ assert_wait((event_t)&task->changing_freeze_state, THREAD_UNINT);
+ task_unlock(task);
+ thread_block(THREAD_CONTINUE_NULL);
+
+ task_lock(task);
+ }
+ task->changing_freeze_state = TRUE;
#endif
- kr = release_task_hold(task, TRUE);
+ kr = release_task_hold(task, TASK_HOLD_PIDSUSPEND);
task_unlock(task);
#if (CONFIG_FREEZE && THAW_ON_RESUME)
- if ((kr == KERN_SUCCESS) && (frozen == TRUE)) {
- kr = vm_map_thaw(task->map);
+ if ((kr == KERN_SUCCESS) && (task->frozen == TRUE)) {
+
+ if (COMPRESSED_PAGER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) {
+
+ kr = KERN_SUCCESS;
+ } else {
+
+ kr = vm_map_thaw(task->map);
+ }
}
+ task_lock(task);
+
+ if (kr == KERN_SUCCESS)
+ task->frozen = FALSE;
+ task->changing_freeze_state = FALSE;
+ thread_wakeup(&task->changing_freeze_state);
+
+ task_unlock(task);
#endif
return (kr);
task_lock(task);
+ while (task->changing_freeze_state) {
+
+ assert_wait((event_t)&task->changing_freeze_state, THREAD_UNINT);
+ task_unlock(task);
+ thread_block(THREAD_CONTINUE_NULL);
+
+ task_lock(task);
+ }
if (task->frozen) {
- task_unlock(task);
- return (KERN_FAILURE);
+ task_unlock(task);
+ return (KERN_FAILURE);
}
-
- if (walk_only == FALSE) {
- task->frozen = TRUE;
- }
+ task->changing_freeze_state = TRUE;
task_unlock(task);
kr = vm_map_freeze(task->map, purgeable_count, wired_count, clean_count, dirty_count, dirty_budget, shared);
}
+ task_lock(task);
+
+ if (walk_only == FALSE && kr == KERN_SUCCESS)
+ task->frozen = TRUE;
+ task->changing_freeze_state = FALSE;
+ thread_wakeup(&task->changing_freeze_state);
+
+ task_unlock(task);
+
return (kr);
}
* Conditions:
* The caller holds a reference to the task
*/
+extern void
+vm_consider_waking_compactor_swapper(void);
+
kern_return_t
task_thaw(
register task_t task)
task_lock(task);
+ while (task->changing_freeze_state) {
+
+ assert_wait((event_t)&task->changing_freeze_state, THREAD_UNINT);
+ task_unlock(task);
+ thread_block(THREAD_CONTINUE_NULL);
+
+ task_lock(task);
+ }
if (!task->frozen) {
- task_unlock(task);
- return (KERN_FAILURE);
+ task_unlock(task);
+ return (KERN_FAILURE);
}
+ task->changing_freeze_state = TRUE;
- task->frozen = FALSE;
+ if (DEFAULT_PAGER_IS_ACTIVE || DEFAULT_FREEZER_IS_ACTIVE) {
+ task_unlock(task);
+
+ kr = vm_map_thaw(task->map);
+
+ task_lock(task);
+
+ if (kr == KERN_SUCCESS)
+ task->frozen = FALSE;
+ } else {
+ task->frozen = FALSE;
+ kr = KERN_SUCCESS;
+ }
+ task->changing_freeze_state = FALSE;
+ thread_wakeup(&task->changing_freeze_state);
+
task_unlock(task);
- kr = vm_map_thaw(task->map);
+ if (COMPRESSED_PAGER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) {
+ vm_consider_waking_compactor_swapper();
+ }
return (kr);
}
task_lock(task);
task->sec_token = sec_token;
task->audit_token = audit_token;
- task_unlock(task);
+
+ task_unlock(task);
if (host_priv != HOST_PRIV_NULL) {
kr = host_get_host_priv_port(host_priv, &host_port);
kern_return_t
task_info(
- task_t task,
- task_flavor_t flavor,
- task_info_t task_info_out,
+ task_t task,
+ task_flavor_t flavor,
+ task_info_t task_info_out,
mach_msg_type_number_t *task_info_count)
{
kern_return_t error = KERN_SUCCESS;
queue_iterate(&task->threads, thread, thread_t, task_threads) {
- time_value_t user_time, system_time;
+ time_value_t user_time, system_time;
- thread_read_times(thread, &user_time, &system_time);
+ if (thread->options & TH_OPT_IDLE_THREAD)
+ continue;
- time_value_add(×_info->user_time, &user_time);
- time_value_add(×_info->system_time, &system_time);
- }
+ thread_read_times(thread, &user_time, &system_time);
+ time_value_add(×_info->user_time, &user_time);
+ time_value_add(×_info->system_time, &system_time);
+ }
*task_info_count = TASK_THREAD_TIMES_INFO_COUNT;
break;
uint64_t tval;
spl_t x;
+ if (thread->options & TH_OPT_IDLE_THREAD)
+ continue;
+
x = splsched();
thread_lock(thread);
error = task_affinity_info(task, task_info_out, task_info_count);
break;
}
+ case TASK_POWER_INFO:
+ {
+ if (*task_info_count < TASK_POWER_INFO_COUNT) {
+ error = KERN_INVALID_ARGUMENT;
+ break;
+ }
+
+ task_power_info_locked(task, (task_power_info_t)task_info_out);
+ break;
+ }
+
+ case TASK_VM_INFO:
+ case TASK_VM_INFO_PURGEABLE:
+ {
+ task_vm_info_t vm_info;
+ vm_map_t map;
+
+ if (*task_info_count < TASK_VM_INFO_COUNT) {
+ error = KERN_INVALID_ARGUMENT;
+ break;
+ }
+
+ vm_info = (task_vm_info_t)task_info_out;
+
+ if (task == kernel_task) {
+ map = kernel_map;
+ /* no lock */
+ } else {
+ map = task->map;
+ vm_map_lock_read(map);
+ }
+
+ vm_info->virtual_size = (typeof(vm_info->virtual_size))map->size;
+ vm_info->region_count = map->hdr.nentries;
+ vm_info->page_size = vm_map_page_size(map);
+
+ vm_info->resident_size = pmap_resident_count(map->pmap);
+ vm_info->resident_size *= PAGE_SIZE;
+ vm_info->resident_size_peak = pmap_resident_max(map->pmap);
+ vm_info->resident_size_peak *= PAGE_SIZE;
+
+#define _VM_INFO(_name) \
+ vm_info->_name = ((mach_vm_size_t) map->pmap->stats._name) * PAGE_SIZE
+
+ _VM_INFO(device);
+ _VM_INFO(device_peak);
+ _VM_INFO(external);
+ _VM_INFO(external_peak);
+ _VM_INFO(internal);
+ _VM_INFO(internal_peak);
+ _VM_INFO(reusable);
+ _VM_INFO(reusable_peak);
+ _VM_INFO(compressed);
+ _VM_INFO(compressed_peak);
+ _VM_INFO(compressed_lifetime);
+
+ vm_info->purgeable_volatile_pmap = 0;
+ vm_info->purgeable_volatile_resident = 0;
+ vm_info->purgeable_volatile_virtual = 0;
+ if (task == kernel_task) {
+ /*
+ * We do not maintain the detailed stats for the
+ * kernel_pmap, so just count everything as
+ * "internal"...
+ */
+ vm_info->internal = vm_info->resident_size;
+ /*
+ * ... but since the memory held by the VM compressor
+ * in the kernel address space ought to be attributed
+ * to user-space tasks, we subtract it from "internal"
+ * to give memory reporting tools a more accurate idea
+ * of what the kernel itself is actually using, instead
+ * of making it look like the kernel is leaking memory
+ * when the system is under memory pressure.
+ */
+ vm_info->internal -= (VM_PAGE_COMPRESSOR_COUNT *
+ PAGE_SIZE);
+ } else {
+ mach_vm_size_t volatile_virtual_size;
+ mach_vm_size_t volatile_resident_size;
+ mach_vm_size_t volatile_pmap_size;
+ kern_return_t kr;
+
+ if (flavor == TASK_VM_INFO_PURGEABLE) {
+ kr = vm_map_query_volatile(
+ map,
+ &volatile_virtual_size,
+ &volatile_resident_size,
+ &volatile_pmap_size);
+ if (kr == KERN_SUCCESS) {
+ vm_info->purgeable_volatile_pmap =
+ volatile_pmap_size;
+ vm_info->purgeable_volatile_resident =
+ volatile_resident_size;
+ vm_info->purgeable_volatile_virtual =
+ volatile_virtual_size;
+ }
+ }
+ vm_map_unlock_read(map);
+ }
+
+ *task_info_count = TASK_VM_INFO_COUNT;
+ break;
+ }
+
default:
error = KERN_INVALID_ARGUMENT;
}
return (error);
}
+/*
+ * task_power_info
+ *
+ * Returns power stats for the task.
+ * Note: Called with task locked.
+ */
+void
+task_power_info_locked(
+ task_t task,
+ task_power_info_t info)
+{
+ thread_t thread;
+ ledger_amount_t tmp;
+
+ task_lock_assert_owned(task);
+
+ ledger_get_entries(task->ledger, task_ledgers.interrupt_wakeups,
+ (ledger_amount_t *)&info->task_interrupt_wakeups, &tmp);
+ ledger_get_entries(task->ledger, task_ledgers.platform_idle_wakeups,
+ (ledger_amount_t *)&info->task_platform_idle_wakeups, &tmp);
+
+ info->task_timer_wakeups_bin_1 = task->task_timer_wakeups_bin_1;
+ info->task_timer_wakeups_bin_2 = task->task_timer_wakeups_bin_2;
+
+ info->total_user = task->total_user_time;
+ info->total_system = task->total_system_time;
+
+ queue_iterate(&task->threads, thread, thread_t, task_threads) {
+ uint64_t tval;
+ spl_t x;
+
+ if (thread->options & TH_OPT_IDLE_THREAD)
+ continue;
+
+ x = splsched();
+ thread_lock(thread);
+
+ info->task_timer_wakeups_bin_1 += thread->thread_timer_wakeups_bin_1;
+ info->task_timer_wakeups_bin_2 += thread->thread_timer_wakeups_bin_2;
+
+ tval = timer_grab(&thread->user_timer);
+ info->total_user += tval;
+
+ tval = timer_grab(&thread->system_timer);
+ if (thread->precise_user_kernel_time) {
+ info->total_system += tval;
+ } else {
+ /* system_timer may represent either sys or user */
+ info->total_user += tval;
+ }
+
+ thread_unlock(thread);
+ splx(x);
+ }
+}
+
+kern_return_t
+task_purgable_info(
+ task_t task,
+ task_purgable_info_t *stats)
+{
+ if (task == TASK_NULL || stats == NULL)
+ return KERN_INVALID_ARGUMENT;
+ /* Take task reference */
+ task_reference(task);
+ vm_purgeable_stats((vm_purgeable_info_t)stats, task);
+ /* Drop task reference */
+ task_deallocate(task);
+ return KERN_SUCCESS;
+}
+
void
task_vtimer_set(
task_t task,
task_synchronizer_destroy_all(task_t task)
{
semaphore_t semaphore;
- lock_set_t lock_set;
/*
* Destroy owned semaphores
semaphore = (semaphore_t) queue_first(&task->semaphore_list);
(void) semaphore_destroy(task, semaphore);
}
-
- /*
- * Destroy owned lock sets
- */
-
- while (!queue_empty(&task->lock_set_list)) {
- lock_set = (lock_set_t) queue_first(&task->lock_set_list);
- (void) lock_set_destroy(task, lock_set);
- }
}
/*
return ret;
}
+#if CONFIG_JETSAM
+#define HWM_USERCORE_MINSPACE 250 // free space (in MB) required *after* core file creation
+
+void __attribute__((noinline))
+THIS_PROCESS_CROSSED_HIGH_WATERMARK__SENDING_EXC_RESOURCE(int max_footprint_mb)
+{
+ task_t task = current_task();
+ int pid = 0;
+ char *procname = (char *) "unknown";
+ mach_exception_data_type_t code[EXCEPTION_CODE_MAX];
+
+#ifdef MACH_BSD
+ pid = proc_selfpid();
+ if (task->bsd_info != NULL)
+ procname = proc_name_address(current_task()->bsd_info);
+#endif
+
+ if (hwm_user_cores) {
+ int error;
+ uint64_t starttime, end;
+ clock_sec_t secs = 0;
+ uint32_t microsecs = 0;
+
+ starttime = mach_absolute_time();
+ /*
+ * Trigger a coredump of this process. Don't proceed unless we know we won't
+ * be filling up the disk; and ignore the core size resource limit for this
+ * core file.
+ */
+ if ((error = coredump(current_task()->bsd_info, HWM_USERCORE_MINSPACE, 1)) != 0) {
+ printf("couldn't take coredump of %s[%d]: %d\n", procname, pid, error);
+ }
+ /*
+ * coredump() leaves the task suspended.
+ */
+ task_resume_internal(current_task());
+
+ end = mach_absolute_time();
+ absolutetime_to_microtime(end - starttime, &secs, µsecs);
+ printf("coredump of %s[%d] taken in %d secs %d microsecs\n",
+ proc_name_address(current_task()->bsd_info), pid, (int)secs, microsecs);
+ }
+
+ if (disable_exc_resource) {
+ printf("process %s[%d] crossed memory high watermark (%d MB); EXC_RESOURCE "
+ "supressed by a boot-arg.\n", procname, pid, max_footprint_mb);
+ return;
+ }
+
+ printf("process %s[%d] crossed memory high watermark (%d MB); sending "
+ "EXC_RESOURCE.\n", procname, pid, max_footprint_mb);
+
+ code[0] = code[1] = 0;
+ EXC_RESOURCE_ENCODE_TYPE(code[0], RESOURCE_TYPE_MEMORY);
+ EXC_RESOURCE_ENCODE_FLAVOR(code[0], FLAVOR_HIGH_WATERMARK);
+ EXC_RESOURCE_HWM_ENCODE_LIMIT(code[0], max_footprint_mb);
+ exception_triage(EXC_RESOURCE, code, EXCEPTION_CODE_MAX);
+}
+
+/*
+ * Callback invoked when a task exceeds its physical footprint limit.
+ */
+void
+task_footprint_exceeded(int warning, __unused const void *param0, __unused const void *param1)
+{
+ ledger_amount_t max_footprint_mb;
+
+ if (warning == LEDGER_WARNING_DIPPED_BELOW) {
+ /*
+ * Task memory limits only provide a warning on the way up.
+ */
+ return;
+ }
+
+ ledger_get_limit(current_task()->ledger, task_ledgers.phys_footprint, &max_footprint_mb);
+ max_footprint_mb >>= 20;
+
+ /*
+ * If this an actual violation (not a warning),
+ * generate a non-fatal high watermark EXC_RESOURCE.
+ */
+ if ((warning == 0) && (current_task()->rusage_cpu_flags & TASK_RUSECPU_FLAGS_PHYS_FOOTPRINT_EXCEPTION)) {
+ THIS_PROCESS_CROSSED_HIGH_WATERMARK__SENDING_EXC_RESOURCE((int)max_footprint_mb);
+ }
+
+ memorystatus_on_ledger_footprint_exceeded((warning == LEDGER_WARNING_ROSE_ABOVE) ? TRUE : FALSE,
+ (int)max_footprint_mb);
+}
+
+extern int proc_check_footprint_priv(void);
+
+kern_return_t
+task_set_phys_footprint_limit(
+ task_t task,
+ int new_limit_mb,
+ int *old_limit_mb)
+{
+ kern_return_t error;
+
+ if ((error = proc_check_footprint_priv())) {
+ return (KERN_NO_ACCESS);
+ }
+
+ return task_set_phys_footprint_limit_internal(task, new_limit_mb, old_limit_mb, FALSE);
+}
+
+kern_return_t
+task_set_phys_footprint_limit_internal(
+ task_t task,
+ int new_limit_mb,
+ int *old_limit_mb,
+ boolean_t trigger_exception)
+{
+ ledger_amount_t old;
+
+ ledger_get_limit(task->ledger, task_ledgers.phys_footprint, &old);
+
+ if (old_limit_mb) {
+ *old_limit_mb = old >> 20;
+ }
+
+ if (new_limit_mb == -1) {
+ /*
+ * Caller wishes to remove the limit.
+ */
+ ledger_set_limit(task->ledger, task_ledgers.phys_footprint,
+ max_task_footprint ? max_task_footprint : LEDGER_LIMIT_INFINITY,
+ max_task_footprint ? PHYS_FOOTPRINT_WARNING_LEVEL : 0);
+ return (KERN_SUCCESS);
+ }
+
+#ifdef CONFIG_NOMONITORS
+ return (KERN_SUCCESS);
+#endif /* CONFIG_NOMONITORS */
+
+ task_lock(task);
+
+ if (trigger_exception) {
+ task->rusage_cpu_flags |= TASK_RUSECPU_FLAGS_PHYS_FOOTPRINT_EXCEPTION;
+ } else {
+ task->rusage_cpu_flags &= ~TASK_RUSECPU_FLAGS_PHYS_FOOTPRINT_EXCEPTION;
+ }
+
+ ledger_set_limit(task->ledger, task_ledgers.phys_footprint,
+ (ledger_amount_t)new_limit_mb << 20, PHYS_FOOTPRINT_WARNING_LEVEL);
+
+ task_unlock(task);
+
+ return (KERN_SUCCESS);
+}
+
+kern_return_t
+task_get_phys_footprint_limit(
+ task_t task,
+ int *limit_mb)
+{
+ ledger_amount_t limit;
+
+ ledger_get_limit(task->ledger, task_ledgers.phys_footprint, &limit);
+ *limit_mb = limit >> 20;
+
+ return (KERN_SUCCESS);
+}
+#else /* CONFIG_JETSAM */
+kern_return_t
+task_set_phys_footprint_limit(
+ __unused task_t task,
+ __unused int new_limit_mb,
+ __unused int *old_limit_mb)
+{
+ return (KERN_FAILURE);
+}
+
+kern_return_t
+task_get_phys_footprint_limit(
+ __unused task_t task,
+ __unused int *limit_mb)
+{
+ return (KERN_FAILURE);
+}
+#endif /* CONFIG_JETSAM */
/*
* We need to export some functions to other components that
return (&task->maclabel);
}
#endif
+
+/*
+ * Control the CPU usage monitor for a task.
+ */
+kern_return_t
+task_cpu_usage_monitor_ctl(task_t task, uint32_t *flags)
+{
+ int error = KERN_SUCCESS;
+
+ if (*flags & CPUMON_MAKE_FATAL) {
+ task->rusage_cpu_flags |= TASK_RUSECPU_FLAGS_FATAL_CPUMON;
+ } else {
+ error = KERN_INVALID_ARGUMENT;
+ }
+
+ return error;
+}
+
+/*
+ * Control the wakeups monitor for a task.
+ */
+kern_return_t
+task_wakeups_monitor_ctl(task_t task, uint32_t *flags, int32_t *rate_hz)
+{
+ ledger_t ledger = task->ledger;
+
+ task_lock(task);
+ if (*flags & WAKEMON_GET_PARAMS) {
+ ledger_amount_t limit;
+ uint64_t period;
+
+ ledger_get_limit(ledger, task_ledgers.interrupt_wakeups, &limit);
+ ledger_get_period(ledger, task_ledgers.interrupt_wakeups, &period);
+
+ if (limit != LEDGER_LIMIT_INFINITY) {
+ /*
+ * An active limit means the wakeups monitor is enabled.
+ */
+ *rate_hz = (int32_t)(limit / (int64_t)(period / NSEC_PER_SEC));
+ *flags = WAKEMON_ENABLE;
+ if (task->rusage_cpu_flags & TASK_RUSECPU_FLAGS_FATAL_WAKEUPSMON) {
+ *flags |= WAKEMON_MAKE_FATAL;
+ }
+ } else {
+ *flags = WAKEMON_DISABLE;
+ *rate_hz = -1;
+ }
+
+ /*
+ * If WAKEMON_GET_PARAMS is present in flags, all other flags are ignored.
+ */
+ task_unlock(task);
+ return KERN_SUCCESS;
+ }
+
+ if (*flags & WAKEMON_ENABLE) {
+ if (*flags & WAKEMON_SET_DEFAULTS) {
+ *rate_hz = task_wakeups_monitor_rate;
+ }
+
+#ifndef CONFIG_NOMONITORS
+ if (*flags & WAKEMON_MAKE_FATAL) {
+ task->rusage_cpu_flags |= TASK_RUSECPU_FLAGS_FATAL_WAKEUPSMON;
+ }
+#endif /* CONFIG_NOMONITORS */
+
+ if (*rate_hz < 0) {
+ task_unlock(task);
+ return KERN_INVALID_ARGUMENT;
+ }
+
+#ifndef CONFIG_NOMONITORS
+ ledger_set_limit(ledger, task_ledgers.interrupt_wakeups, *rate_hz * task_wakeups_monitor_interval,
+ task_wakeups_monitor_ustackshots_trigger_pct);
+ ledger_set_period(ledger, task_ledgers.interrupt_wakeups, task_wakeups_monitor_interval * NSEC_PER_SEC);
+ ledger_enable_callback(ledger, task_ledgers.interrupt_wakeups);
+#endif /* CONFIG_NOMONITORS */
+ } else if (*flags & WAKEMON_DISABLE) {
+ /*
+ * Caller wishes to disable wakeups monitor on the task.
+ *
+ * Disable telemetry if it was triggered by the wakeups monitor, and
+ * remove the limit & callback on the wakeups ledger entry.
+ */
+#if CONFIG_TELEMETRY
+ telemetry_task_ctl_locked(current_task(), TF_WAKEMON_WARNING, 0);
+#endif
+ ledger_disable_refill(ledger, task_ledgers.interrupt_wakeups);
+ ledger_disable_callback(ledger, task_ledgers.interrupt_wakeups);
+ }
+
+ task_unlock(task);
+ return KERN_SUCCESS;
+}
+
+void
+task_wakeups_rate_exceeded(int warning, __unused const void *param0, __unused const void *param1)
+{
+ if (warning == LEDGER_WARNING_ROSE_ABOVE) {
+#if CONFIG_TELEMETRY
+ /*
+ * This task is in danger of violating the wakeups monitor. Enable telemetry on this task
+ * so there are micro-stackshots available if and when EXC_RESOURCE is triggered.
+ */
+ telemetry_task_ctl(current_task(), TF_WAKEMON_WARNING, 1);
+#endif
+ return;
+ }
+
+#if CONFIG_TELEMETRY
+ /*
+ * If the balance has dipped below the warning level (LEDGER_WARNING_DIPPED_BELOW) or
+ * exceeded the limit, turn telemetry off for the task.
+ */
+ telemetry_task_ctl(current_task(), TF_WAKEMON_WARNING, 0);
+#endif
+
+ if (warning == 0) {
+ THIS_PROCESS_IS_CAUSING_TOO_MANY_WAKEUPS__SENDING_EXC_RESOURCE();
+ }
+}
+
+void __attribute__((noinline))
+THIS_PROCESS_IS_CAUSING_TOO_MANY_WAKEUPS__SENDING_EXC_RESOURCE(void)
+{
+ task_t task = current_task();
+ int pid = 0;
+ char *procname = (char *) "unknown";
+ uint64_t observed_wakeups_rate;
+ uint64_t permitted_wakeups_rate;
+ uint64_t observation_interval;
+ mach_exception_data_type_t code[EXCEPTION_CODE_MAX];
+ struct ledger_entry_info lei;
+
+#ifdef MACH_BSD
+ pid = proc_selfpid();
+ if (task->bsd_info != NULL)
+ procname = proc_name_address(current_task()->bsd_info);
+#endif
+
+ ledger_get_entry_info(task->ledger, task_ledgers.interrupt_wakeups, &lei);
+
+ /*
+ * Disable the exception notification so we don't overwhelm
+ * the listener with an endless stream of redundant exceptions.
+ */
+ uint32_t flags = WAKEMON_DISABLE;
+ task_wakeups_monitor_ctl(task, &flags, NULL);
+
+ observed_wakeups_rate = (lei.lei_balance * (int64_t)NSEC_PER_SEC) / lei.lei_last_refill;
+ permitted_wakeups_rate = lei.lei_limit / task_wakeups_monitor_interval;
+ observation_interval = lei.lei_refill_period / NSEC_PER_SEC;
+
+ if (disable_exc_resource) {
+ printf("process %s[%d] caught causing excessive wakeups. EXC_RESOURCE "
+ "supressed by a boot-arg\n", procname, pid);
+ return;
+ }
+ if (audio_active) {
+ printf("process %s[%d] caught causing excessive wakeups. EXC_RESOURCE "
+ "supressed due to audio playback\n", procname, pid);
+ return;
+ }
+ printf("process %s[%d] caught causing excessive wakeups. Observed wakeups rate "
+ "(per sec): %lld; Maximum permitted wakeups rate (per sec): %lld; Observation "
+ "period: %lld seconds; Task lifetime number of wakeups: %lld\n",
+ procname, pid, observed_wakeups_rate, permitted_wakeups_rate,
+ observation_interval, lei.lei_credit);
+
+ code[0] = code[1] = 0;
+ EXC_RESOURCE_ENCODE_TYPE(code[0], RESOURCE_TYPE_WAKEUPS);
+ EXC_RESOURCE_ENCODE_FLAVOR(code[0], FLAVOR_WAKEUPS_MONITOR);
+ EXC_RESOURCE_CPUMONITOR_ENCODE_WAKEUPS_PERMITTED(code[0], task_wakeups_monitor_rate);
+ EXC_RESOURCE_CPUMONITOR_ENCODE_OBSERVATION_INTERVAL(code[0], observation_interval);
+ EXC_RESOURCE_CPUMONITOR_ENCODE_WAKEUPS_OBSERVED(code[1], lei.lei_balance * (int64_t)NSEC_PER_SEC / lei.lei_last_refill);
+ exception_triage(EXC_RESOURCE, code, EXCEPTION_CODE_MAX);
+
+ if (task->rusage_cpu_flags & TASK_RUSECPU_FLAGS_FATAL_WAKEUPSMON) {
+ task_terminate_internal(task);
+ }
+}
projects / apple / xnu.git / blobdiff