/*
- * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <mach/vm_param.h>
#include <machine/thread.h>
+#include <machine/pal_routines.h>
+#include <machine/limits.h>
#include <kern/kern_types.h>
#include <kern/kalloc.h>
#include <kern/cpu_data.h>
#include <kern/counters.h>
+#include <kern/extmod_statistics.h>
#include <kern/ipc_mig.h>
#include <kern/ipc_tt.h>
#include <kern/mach_param.h>
#include <kern/host.h>
#include <kern/zalloc.h>
#include <kern/assert.h>
+#include <kern/exc_resource.h>
+#include <kern/telemetry.h>
+#if KPC
+#include <kern/kpc.h>
+#endif
#include <ipc/ipc_kmsg.h>
#include <ipc/ipc_port.h>
#ifdef MACH_BSD
extern void proc_exit(void *);
extern uint64_t get_dispatchqueue_offset_from_proc(void *);
+extern int proc_selfpid(void);
+extern char * proc_name_address(void *p);
#endif /* MACH_BSD */
+extern int disable_exc_resource;
+extern int audio_active;
extern int debug_task;
int thread_max = CONFIG_THREAD_MAX; /* Max number of threads */
int task_threadmax = CONFIG_THREAD_MAX;
static uint64_t thread_unique_id = 0;
+struct _thread_ledger_indices thread_ledgers = { -1 };
+static ledger_template_t thread_ledger_template = NULL;
+void init_thread_ledgers(void);
+int task_disable_cpumon(task_t task);
+
+/*
+ * Level (in terms of percentage of the limit) at which the CPU usage monitor triggers telemetry.
+ *
+ * (ie when any thread's CPU consumption exceeds 70% of the limit, start taking user
+ * stacktraces, aka micro-stackshots)
+ */
+#define CPUMON_USTACKSHOTS_TRIGGER_DEFAULT_PCT 70
+
+int cpumon_ustackshots_trigger_pct; /* Percentage. Level at which we start gathering telemetry. */
+void __attribute__((noinline)) THIS_THREAD_IS_CONSUMING_TOO_MUCH_CPU__SENDING_EXC_RESOURCE(void);
+
+/*
+ * The smallest interval over which we support limiting CPU consumption is 1ms
+ */
+#define MINIMUM_CPULIMIT_INTERVAL_MS 1
+
void
thread_bootstrap(void)
{
thread_template.parameter = NULL;
thread_template.importance = 0;
- thread_template.sched_mode = 0;
- thread_template.safe_mode = 0;
+ thread_template.sched_mode = TH_MODE_NONE;
+ thread_template.sched_flags = 0;
+ thread_template.saved_mode = TH_MODE_NONE;
thread_template.safe_release = 0;
thread_template.priority = 0;
thread_template.promotions = 0;
thread_template.pending_promoter_index = 0;
thread_template.pending_promoter[0] =
- thread_template.pending_promoter[1] = NULL;
+ thread_template.pending_promoter[1] = NULL;
+ thread_template.rwlock_count = 0;
thread_template.realtime.deadline = UINT64_MAX;
thread_template.current_quantum = 0;
+ thread_template.last_run_time = 0;
+ thread_template.last_quantum_refill_time = 0;
thread_template.computation_metered = 0;
thread_template.computation_epoch = 0;
+#if defined(CONFIG_SCHED_TRADITIONAL)
thread_template.sched_stamp = 0;
- thread_template.sched_usage = 0;
thread_template.pri_shift = INT8_MAX;
+ thread_template.sched_usage = 0;
thread_template.cpu_usage = thread_template.cpu_delta = 0;
+#endif
thread_template.c_switch = thread_template.p_switch = thread_template.ps_switch = 0;
thread_template.bound_processor = PROCESSOR_NULL;
thread_template.t_dtrace_tracing = 0;
#endif /* CONFIG_DTRACE */
+#if KPC
+ thread_template.kpc_buf = NULL;
+#endif
+
thread_template.t_chud = 0;
thread_template.t_page_creation_count = 0;
thread_template.t_page_creation_time = 0;
thread_template.affinity_set = NULL;
+ thread_template.syscalls_unix = 0;
+ thread_template.syscalls_mach = 0;
+
+ thread_template.t_ledger = LEDGER_NULL;
+ thread_template.t_threadledger = LEDGER_NULL;
+
+ thread_template.requested_policy = default_task_requested_policy;
+ thread_template.effective_policy = default_task_effective_policy;
+ thread_template.pended_policy = default_task_pended_policy;
+
+ thread_template.iotier_override = THROTTLE_LEVEL_NONE;
+
+ thread_template.thread_callout_interrupt_wakeups = thread_template.thread_callout_platform_idle_wakeups = 0;
+
+ thread_template.thread_timer_wakeups_bin_1 = thread_template.thread_timer_wakeups_bin_2 = 0;
+ thread_template.callout_woken_from_icontext = thread_template.callout_woken_from_platform_idle = 0;
+
+ thread_template.thread_tag = 0;
+
init_thread = thread_template;
machine_set_current_thread(&init_thread);
}
thread_max * sizeof(struct thread),
THREAD_CHUNK * sizeof(struct thread),
"threads");
-
+
lck_grp_attr_setdefault(&thread_lck_grp_attr);
lck_grp_init(&thread_lck_grp, "thread", &thread_lck_grp_attr);
lck_attr_setdefault(&thread_lck_attr);
* per-thread structures necessary.
*/
machine_thread_init();
+
+ if (!PE_parse_boot_argn("cpumon_ustackshots_trigger_pct", &cpumon_ustackshots_trigger_pct,
+ sizeof (cpumon_ustackshots_trigger_pct))) {
+ cpumon_ustackshots_trigger_pct = CPUMON_USTACKSHOTS_TRIGGER_DEFAULT_PCT;
+ }
+
+ init_thread_ledgers();
}
static void
thread_terminate_self(void)
{
thread_t thread = current_thread();
+
task_t task;
spl_t s;
int threadcnt;
+ pal_thread_terminate_self(thread);
+
DTRACE_PROC(lwp__exit);
thread_mtx_lock(thread);
- ulock_release_all(thread);
-
ipc_thread_disable(thread);
thread_mtx_unlock(thread);
* Cancel priority depression, wait for concurrent expirations
* on other processors.
*/
- if (thread->sched_mode & TH_MODE_ISDEPRESSED) {
- thread->sched_mode &= ~TH_MODE_ISDEPRESSED;
+ if (thread->sched_flags & TH_SFLAG_DEPRESSED_MASK) {
+ thread->sched_flags &= ~TH_SFLAG_DEPRESSED_MASK;
if (timer_call_cancel(&thread->depress_timer))
thread->depress_timer_active--;
thread_policy_reset(thread);
+
task = thread->task;
uthread_cleanup(task, thread->uthread, task->bsd_info);
threadcnt = hw_atomic_sub(&task->active_thread_count, 1);
* If there is a reserved stack, release it.
*/
if (thread->reserved_stack != 0) {
- if (thread->reserved_stack != thread->kernel_stack)
- stack_free_stack(thread->reserved_stack);
+ stack_free_reserved(thread);
thread->reserved_stack = 0;
}
thread->state |= TH_TERMINATE;
thread_mark_wait_locked(thread, THREAD_UNINT);
assert(thread->promotions == 0);
+ assert(thread->rwlock_count == 0);
thread_unlock(thread);
/* splsched */
if (thread_deallocate_internal(thread) > 0)
return;
+ if(!(thread->state & TH_TERMINATE2))
+ panic("thread_deallocate: thread not properly terminated\n");
+
+#if KPC
+ kpc_thread_destroy(thread);
+#endif
+
+
ipc_thread_terminate(thread);
task = thread->task;
}
#endif /* MACH_BSD */
- task_deallocate(task);
+ if (thread->t_ledger)
+ ledger_dereference(thread->t_ledger);
+ if (thread->t_threadledger)
+ ledger_dereference(thread->t_threadledger);
if (thread->kernel_stack != 0)
stack_free(thread);
lck_mtx_destroy(&thread->mutex, &thread_lck_grp);
machine_thread_destroy(thread);
+ task_deallocate(task);
+
zfree(thread_zone, thread);
}
static void
thread_terminate_daemon(void)
{
- thread_t thread;
- task_t task;
+ thread_t self, thread;
+ task_t task;
+
+ self = current_thread();
+ self->options |= TH_OPT_SYSTEM_CRITICAL;
(void)splsched();
simple_lock(&thread_terminate_lock);
task_lock(task);
task->total_user_time += timer_grab(&thread->user_timer);
- task->total_system_time += timer_grab(&thread->system_timer);
+ if (thread->precise_user_kernel_time) {
+ task->total_system_time += timer_grab(&thread->system_timer);
+ } else {
+ task->total_user_time += timer_grab(&thread->system_timer);
+ }
task->c_switch += thread->c_switch;
task->p_switch += thread->p_switch;
task->ps_switch += thread->ps_switch;
+ task->syscalls_unix += thread->syscalls_unix;
+ task->syscalls_mach += thread->syscalls_mach;
+
+ task->task_timer_wakeups_bin_1 += thread->thread_timer_wakeups_bin_1;
+ task->task_timer_wakeups_bin_2 += thread->thread_timer_wakeups_bin_2;
queue_remove(&task->threads, thread, thread_t, task_threads);
task->thread_count--;
simple_unlock(&thread_terminate_lock);
/* splsched */
+ self->options &= ~TH_OPT_SYSTEM_CRITICAL;
thread_block((thread_continue_t)thread_terminate_daemon);
/*NOTREACHED*/
}
thread_stack_daemon(void)
{
thread_t thread;
+ spl_t s;
+ s = splsched();
simple_lock(&thread_stack_lock);
while ((thread = (thread_t)dequeue_head(&thread_stack_queue)) != THREAD_NULL) {
simple_unlock(&thread_stack_lock);
+ splx(s);
+ /* allocate stack with interrupts enabled so that we can call into VM */
stack_alloc(thread);
- (void)splsched();
+ s = splsched();
thread_lock(thread);
thread_setrun(thread, SCHED_PREEMPT | SCHED_TAILQ);
thread_unlock(thread);
- (void)spllo();
simple_lock(&thread_stack_lock);
}
assert_wait((event_t)&thread_stack_queue, THREAD_UNINT);
simple_unlock(&thread_stack_lock);
+ splx(s);
thread_block((thread_continue_t)thread_stack_daemon);
/*NOTREACHED*/
thread_daemon_init(void)
{
kern_return_t result;
- thread_t thread;
+ thread_t thread = NULL;
simple_lock_init(&thread_terminate_lock, 0);
queue_init(&thread_terminate_queue);
return (KERN_FAILURE);
}
- new_thread->task = parent_task;
+ new_thread->task = parent_task;
thread_lock_init(new_thread);
wake_lock_init(new_thread);
lck_mtx_init(&new_thread->mutex, &thread_lck_grp, &thread_lck_attr);
ipc_thread_init(new_thread);
- queue_init(&new_thread->held_ulocks);
new_thread->continuation = continuation;
task_reference_internal(parent_task);
+ if (new_thread->task->rusage_cpu_flags & TASK_RUSECPU_FLAGS_PERTHR_LIMIT) {
+ /*
+ * This task has a per-thread CPU limit; make sure this new thread
+ * gets its limit set too, before it gets out of the kernel.
+ */
+ set_astledger(new_thread);
+ }
+ new_thread->t_threadledger = LEDGER_NULL; /* per thread ledger is not inherited */
+ new_thread->t_ledger = new_thread->task->ledger;
+ if (new_thread->t_ledger)
+ ledger_reference(new_thread->t_ledger);
+
/* Cache the task's map */
new_thread->map = parent_task->map;
new_thread->t_chud = (TASK_PMC_FLAG == (parent_task->t_chud & TASK_PMC_FLAG)) ?
THREAD_PMC_FLAG : 0U;
#endif
+#if KPC
+ kpc_thread_create(new_thread);
+#endif
+
+ /* Only need to update policies pushed from task to thread */
+ new_thread->requested_policy.bg_iotier = parent_task->effective_policy.bg_iotier;
+ new_thread->requested_policy.terminated = parent_task->effective_policy.terminated;
/* Set the thread's scheduling parameters */
- if (parent_task != kernel_task)
- new_thread->sched_mode |= TH_MODE_TIMESHARE;
+ new_thread->sched_mode = SCHED(initial_thread_sched_mode)(parent_task);
+ new_thread->sched_flags = 0;
new_thread->max_priority = parent_task->max_priority;
new_thread->task_priority = parent_task->priority;
new_thread->priority = (priority < 0)? parent_task->priority: priority;
if (new_thread->priority > new_thread->max_priority)
new_thread->priority = new_thread->max_priority;
- new_thread->importance =
- new_thread->priority - new_thread->task_priority;
+ new_thread->importance = new_thread->priority - new_thread->task_priority;
+ new_thread->saved_importance = new_thread->importance;
+
+#if defined(CONFIG_SCHED_TRADITIONAL)
new_thread->sched_stamp = sched_tick;
new_thread->pri_shift = sched_pri_shift;
- compute_priority(new_thread, FALSE);
+#endif
+ SCHED(compute_priority)(new_thread, FALSE);
new_thread->active = TRUE;
kdbg_trace_data(parent_task->bsd_info, &dbg_arg2);
- KERNEL_DEBUG_CONSTANT(
- TRACEDBG_CODE(DBG_TRACE_DATA, 1) | DBG_FUNC_NONE,
- (vm_address_t)(uintptr_t)thread_tid(new_thread), dbg_arg2, 0, 0, 0);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ TRACEDBG_CODE(DBG_TRACE_DATA, 1) | DBG_FUNC_NONE,
+ (vm_address_t)(uintptr_t)thread_tid(new_thread), dbg_arg2, 0, 0, 0);
kdbg_trace_string(parent_task->bsd_info,
&dbg_arg1, &dbg_arg2, &dbg_arg3, &dbg_arg4);
- KERNEL_DEBUG_CONSTANT(
- TRACEDBG_CODE(DBG_TRACE_STRING, 1) | DBG_FUNC_NONE,
- dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, 0);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ TRACEDBG_CODE(DBG_TRACE_STRING, 1) | DBG_FUNC_NONE,
+ dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, 0);
}
DTRACE_PROC1(lwp__create, thread_t, *out_thread);
return (KERN_SUCCESS);
}
-kern_return_t
-thread_create(
+static kern_return_t
+thread_create_internal2(
task_t task,
- thread_t *new_thread)
+ thread_t *new_thread,
+ boolean_t from_user)
{
kern_return_t result;
thread_t thread;
if (task->suspend_count > 0)
thread_hold(thread);
+ if (from_user)
+ extmod_statistics_incr_thread_create(task);
+
task_unlock(task);
lck_mtx_unlock(&tasks_threads_lock);
return (KERN_SUCCESS);
}
+/* No prototype, since task_server.h has the _from_user version if KERNEL_SERVER */
kern_return_t
-thread_create_running(
+thread_create(
+ task_t task,
+ thread_t *new_thread);
+
+kern_return_t
+thread_create(
+ task_t task,
+ thread_t *new_thread)
+{
+ return thread_create_internal2(task, new_thread, FALSE);
+}
+
+kern_return_t
+thread_create_from_user(
+ task_t task,
+ thread_t *new_thread)
+{
+ return thread_create_internal2(task, new_thread, TRUE);
+}
+
+static kern_return_t
+thread_create_running_internal2(
register task_t task,
int flavor,
thread_state_t new_state,
mach_msg_type_number_t new_state_count,
- thread_t *new_thread)
+ thread_t *new_thread,
+ boolean_t from_user)
{
register kern_return_t result;
thread_t thread;
thread_start_internal(thread);
thread_mtx_unlock(thread);
+ if (from_user)
+ extmod_statistics_incr_thread_create(task);
+
task_unlock(task);
lck_mtx_unlock(&tasks_threads_lock);
return (result);
}
+/* Prototype, see justification above */
+kern_return_t
+thread_create_running(
+ register task_t task,
+ int flavor,
+ thread_state_t new_state,
+ mach_msg_type_number_t new_state_count,
+ thread_t *new_thread);
+
+kern_return_t
+thread_create_running(
+ register task_t task,
+ int flavor,
+ thread_state_t new_state,
+ mach_msg_type_number_t new_state_count,
+ thread_t *new_thread)
+{
+ return thread_create_running_internal2(
+ task, flavor, new_state, new_state_count,
+ new_thread, FALSE);
+}
+
+kern_return_t
+thread_create_running_from_user(
+ register task_t task,
+ int flavor,
+ thread_state_t new_state,
+ mach_msg_type_number_t new_state_count,
+ thread_t *new_thread)
+{
+ return thread_create_running_internal2(
+ task, flavor, new_state, new_state_count,
+ new_thread, TRUE);
+}
+
kern_return_t
thread_create_workq(
task_t task,
+ thread_continue_t thread_return,
thread_t *new_thread)
{
kern_return_t result;
if (task == TASK_NULL || task == kernel_task)
return (KERN_INVALID_ARGUMENT);
- result = thread_create_internal(task, -1, (thread_continue_t)thread_bootstrap_return,
- TH_OPTION_NOCRED | TH_OPTION_NOSUSP, &thread);
+ result = thread_create_internal(task, -1, thread_return, TH_OPTION_NOCRED | TH_OPTION_NOSUSP, &thread);
if (result != KERN_SUCCESS)
return (result);
stack_alloc(thread);
assert(thread->kernel_stack != 0);
-#if CONFIG_EMBEDDED
- if (priority > BASEPRI_KERNEL)
-#endif
thread->reserved_stack = thread->kernel_stack;
thread->parameter = parameter;
return kernel_thread_start_priority(continuation, parameter, -1, new_thread);
}
-#ifndef __LP64__
-
-thread_t
-kernel_thread(
- task_t task,
- void (*start)(void))
-{
- kern_return_t result;
- thread_t thread;
-
- if (task != kernel_task)
- panic("kernel_thread");
-
- result = kernel_thread_start_priority((thread_continue_t)start, NULL, -1, &thread);
- if (result != KERN_SUCCESS)
- return (THREAD_NULL);
-
- thread_deallocate(thread);
-
- return (thread);
-}
-
-#endif /* __LP64__ */
kern_return_t
thread_info_internal(
/*
* Update lazy-evaluated scheduler info because someone wants it.
*/
- if (thread->sched_stamp != sched_tick)
- update_priority(thread);
+ if (SCHED(can_update_priority)(thread))
+ SCHED(update_priority)(thread);
basic_info->sleep_time = 0;
* then for 5/8 ageing. The correction factor [3/5] is
* (1/(5/8) - 1).
*/
- basic_info->cpu_usage = (integer_t)(((uint64_t)thread->cpu_usage
- * TH_USAGE_SCALE) / sched_tick_interval);
- basic_info->cpu_usage = (basic_info->cpu_usage * 3) / 5;
-
+ basic_info->cpu_usage = 0;
+#if defined(CONFIG_SCHED_TRADITIONAL)
+ if (sched_tick_interval) {
+ basic_info->cpu_usage = (integer_t)(((uint64_t)thread->cpu_usage
+ * TH_USAGE_SCALE) / sched_tick_interval);
+ basic_info->cpu_usage = (basic_info->cpu_usage * 3) / 5;
+ }
+#endif
+
if (basic_info->cpu_usage > TH_USAGE_SCALE)
basic_info->cpu_usage = TH_USAGE_SCALE;
- basic_info->policy = ((thread->sched_mode & TH_MODE_TIMESHARE)?
+ basic_info->policy = ((thread->sched_mode == TH_MODE_TIMESHARE)?
POLICY_TIMESHARE: POLICY_RR);
flags = 0;
- if (thread->bound_processor != PROCESSOR_NULL && thread->bound_processor->idle_thread == thread)
+ if (thread->options & TH_OPT_IDLE_THREAD)
flags |= TH_FLAGS_IDLE;
if (!thread->kernel_stack)
thread_lock(thread);
identifier_info->thread_id = thread->thread_id;
-#if defined(__ppc__) || defined(__arm__)
identifier_info->thread_handle = thread->machine.cthread_self;
-#else
- identifier_info->thread_handle = thread->machine.pcb->cthread_self;
-#endif
if(thread->task->bsd_info) {
identifier_info->dispatch_qaddr = identifier_info->thread_handle + get_dispatchqueue_offset_from_proc(thread->task->bsd_info);
} else {
s = splsched();
thread_lock(thread);
- if (!(thread->sched_mode & TH_MODE_TIMESHARE)) {
+ if (thread->sched_mode != TH_MODE_TIMESHARE) {
thread_unlock(thread);
splx(s);
return (KERN_INVALID_POLICY);
}
- ts_info->depressed = (thread->sched_mode & TH_MODE_ISDEPRESSED) != 0;
+ ts_info->depressed = (thread->sched_flags & TH_SFLAG_DEPRESSED_MASK) != 0;
if (ts_info->depressed) {
ts_info->base_priority = DEPRESSPRI;
ts_info->depress_priority = thread->priority;
else
if (flavor == THREAD_SCHED_RR_INFO) {
policy_rr_info_t rr_info;
-
+ uint32_t quantum_time;
+ uint64_t quantum_ns;
+
if (*thread_info_count < POLICY_RR_INFO_COUNT)
return (KERN_INVALID_ARGUMENT);
s = splsched();
thread_lock(thread);
- if (thread->sched_mode & TH_MODE_TIMESHARE) {
+ if (thread->sched_mode == TH_MODE_TIMESHARE) {
thread_unlock(thread);
splx(s);
return (KERN_INVALID_POLICY);
}
- rr_info->depressed = (thread->sched_mode & TH_MODE_ISDEPRESSED) != 0;
+ rr_info->depressed = (thread->sched_flags & TH_SFLAG_DEPRESSED_MASK) != 0;
if (rr_info->depressed) {
rr_info->base_priority = DEPRESSPRI;
rr_info->depress_priority = thread->priority;
rr_info->depress_priority = -1;
}
+ quantum_time = SCHED(initial_quantum_size)(THREAD_NULL);
+ absolutetime_to_nanoseconds(quantum_time, &quantum_ns);
+
rr_info->max_priority = thread->max_priority;
- rr_info->quantum = std_quantum_us / 1000;
+ rr_info->quantum = (uint32_t)(quantum_ns / 1000 / 1000);
thread_unlock(thread);
splx(s);
{
clock_sec_t secs;
clock_usec_t usecs;
+ uint64_t tval_user, tval_system;
- absolutetime_to_microtime(timer_grab(&thread->user_timer), &secs, &usecs);
- user_time->seconds = (typeof(user_time->seconds))secs;
- user_time->microseconds = usecs;
+ tval_user = timer_grab(&thread->user_timer);
+ tval_system = timer_grab(&thread->system_timer);
- absolutetime_to_microtime(timer_grab(&thread->system_timer), &secs, &usecs);
- system_time->seconds = (typeof(system_time->seconds))secs;
- system_time->microseconds = usecs;
+ if (thread->precise_user_kernel_time) {
+ absolutetime_to_microtime(tval_user, &secs, &usecs);
+ user_time->seconds = (typeof(user_time->seconds))secs;
+ user_time->microseconds = usecs;
+
+ absolutetime_to_microtime(tval_system, &secs, &usecs);
+ system_time->seconds = (typeof(system_time->seconds))secs;
+ system_time->microseconds = usecs;
+ } else {
+ /* system_timer may represent either sys or user */
+ tval_user += tval_system;
+ absolutetime_to_microtime(tval_user, &secs, &usecs);
+ user_time->seconds = (typeof(user_time->seconds))secs;
+ user_time->microseconds = usecs;
+
+ system_time->seconds = 0;
+ system_time->microseconds = 0;
+ }
}
kern_return_t
return (thread_wire_internal(host_priv, thread, wired, NULL));
}
+
+/*
+ * XXX assuming current thread only, for now...
+ */
+void
+thread_guard_violation(thread_t thread, unsigned type)
+{
+ assert(thread == current_thread());
+
+ spl_t s = splsched();
+ /*
+ * Use the saved state area of the thread structure
+ * to store all info required to handle the AST when
+ * returning to userspace
+ */
+ thread->guard_exc_info.type = type;
+ thread_ast_set(thread, AST_GUARD);
+ ast_propagate(thread->ast);
+
+ splx(s);
+}
+
+/*
+ * guard_ast:
+ *
+ * Handle AST_GUARD for a thread. This routine looks at the
+ * state saved in the thread structure to determine the cause
+ * of this exception. Based on this value, it invokes the
+ * appropriate routine which determines other exception related
+ * info and raises the exception.
+ */
+void
+guard_ast(thread_t thread)
+{
+ if (thread->guard_exc_info.type == GUARD_TYPE_MACH_PORT)
+ mach_port_guard_ast(thread);
+ else
+ fd_guard_ast(thread);
+}
+
+static void
+thread_cputime_callback(int warning, __unused const void *arg0, __unused const void *arg1)
+{
+ if (warning == LEDGER_WARNING_ROSE_ABOVE) {
+#if CONFIG_TELEMETRY
+ /*
+ * This thread is in danger of violating the CPU usage monitor. Enable telemetry
+ * on the entire task so there are micro-stackshots available if and when
+ * EXC_RESOURCE is triggered. We could have chosen to enable micro-stackshots
+ * for this thread only; but now that this task is suspect, knowing what all of
+ * its threads are up to will be useful.
+ */
+ telemetry_task_ctl(current_task(), TF_CPUMON_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_CPUMON_WARNING, 0);
+#endif
+
+ if (warning == 0) {
+ THIS_THREAD_IS_CONSUMING_TOO_MUCH_CPU__SENDING_EXC_RESOURCE();
+ }
+}
+
+void __attribute__((noinline))
+THIS_THREAD_IS_CONSUMING_TOO_MUCH_CPU__SENDING_EXC_RESOURCE(void)
+{
+ int pid = 0;
+ task_t task = current_task();
+ thread_t thread = current_thread();
+ uint64_t tid = thread->thread_id;
+ char *procname = (char *) "unknown";
+ time_value_t thread_total_time = {0, 0};
+ time_value_t thread_system_time;
+ time_value_t thread_user_time;
+ int action;
+ uint8_t percentage;
+ uint32_t limit_percent;
+ uint32_t usage_percent;
+ uint32_t interval_sec;
+ uint64_t interval_ns;
+ uint64_t balance_ns;
+ boolean_t fatal = FALSE;
+
+ mach_exception_data_type_t code[EXCEPTION_CODE_MAX];
+ struct ledger_entry_info lei;
+
+ assert(thread->t_threadledger != LEDGER_NULL);
+
+ /*
+ * Now that a thread has tripped the monitor, disable it for the entire task.
+ */
+ task_lock(task);
+ if ((task->rusage_cpu_flags & TASK_RUSECPU_FLAGS_PERTHR_LIMIT) == 0) {
+ /*
+ * The CPU usage monitor has been disabled on our task, so some other
+ * thread must have gotten here first. We only send one exception per
+ * task lifetime, so there's nothing left for us to do here.
+ */
+ task_unlock(task);
+ return;
+ }
+ if (task->rusage_cpu_flags & TASK_RUSECPU_FLAGS_FATAL_CPUMON) {
+ fatal = TRUE;
+ }
+ task_disable_cpumon(task);
+ task_unlock(task);
+
+#ifdef MACH_BSD
+ pid = proc_selfpid();
+ if (task->bsd_info != NULL)
+ procname = proc_name_address(task->bsd_info);
+#endif
+
+ thread_get_cpulimit(&action, &percentage, &interval_ns);
+
+ interval_sec = (uint32_t)(interval_ns / NSEC_PER_SEC);
+
+ thread_read_times(thread, &thread_user_time, &thread_system_time);
+ time_value_add(&thread_total_time, &thread_user_time);
+ time_value_add(&thread_total_time, &thread_system_time);
+
+ ledger_get_entry_info(thread->t_threadledger, thread_ledgers.cpu_time, &lei);
+
+ absolutetime_to_nanoseconds(lei.lei_balance, &balance_ns);
+ usage_percent = (uint32_t) ((balance_ns * 100ULL) / lei.lei_last_refill);
+
+ /* Show refill period in the same units as balance, limit, etc */
+ nanoseconds_to_absolutetime(lei.lei_refill_period, &lei.lei_refill_period);
+
+ limit_percent = (uint32_t) ((lei.lei_limit * 100ULL) / lei.lei_refill_period);
+
+ /* TODO: show task total runtime as well? see TASK_ABSOLUTETIME_INFO */
+
+ if (disable_exc_resource) {
+ printf("process %s[%d] thread %llu caught burning CPU!; EXC_RESOURCE "
+ "supressed by a boot-arg\n", procname, pid, tid);
+ return;
+ }
+
+ if (audio_active) {
+ printf("process %s[%d] thread %llu caught burning CPU!; EXC_RESOURCE "
+ "supressed due to audio playback\n", procname, pid, tid);
+ return;
+ }
+ printf("process %s[%d] thread %llu caught burning CPU! "
+ "It used more than %d%% CPU (Actual recent usage: %d%%) over %d seconds. "
+ "thread lifetime cpu usage %d.%06d seconds, (%d.%06d user, %d.%06d system) "
+ "ledger info: balance: %lld credit: %lld debit: %lld limit: %llu (%d%%) "
+ "period: %llu time since last refill (ns): %llu \n",
+ procname, pid, tid,
+ percentage, usage_percent, interval_sec,
+ thread_total_time.seconds, thread_total_time.microseconds,
+ thread_user_time.seconds, thread_user_time.microseconds,
+ thread_system_time.seconds, thread_system_time.microseconds,
+ lei.lei_balance,
+ lei.lei_credit, lei.lei_debit,
+ lei.lei_limit, limit_percent,
+ lei.lei_refill_period, lei.lei_last_refill);
+
+
+ code[0] = code[1] = 0;
+ EXC_RESOURCE_ENCODE_TYPE(code[0], RESOURCE_TYPE_CPU);
+ EXC_RESOURCE_ENCODE_FLAVOR(code[0], FLAVOR_CPU_MONITOR);
+ EXC_RESOURCE_CPUMONITOR_ENCODE_INTERVAL(code[0], interval_sec);
+ EXC_RESOURCE_CPUMONITOR_ENCODE_PERCENTAGE(code[0], limit_percent);
+ EXC_RESOURCE_CPUMONITOR_ENCODE_PERCENTAGE(code[1], usage_percent);
+ exception_triage(EXC_RESOURCE, code, EXCEPTION_CODE_MAX);
+
+ if (fatal) {
+ task_terminate_internal(task);
+ }
+}
+
+void
+init_thread_ledgers(void) {
+ ledger_template_t t;
+ int idx;
+
+ assert(thread_ledger_template == NULL);
+
+ if ((t = ledger_template_create("Per-thread ledger")) == NULL)
+ panic("couldn't create thread ledger template");
+
+ if ((idx = ledger_entry_add(t, "cpu_time", "sched", "ns")) < 0) {
+ panic("couldn't create cpu_time entry for thread ledger template");
+ }
+
+ if (ledger_set_callback(t, idx, thread_cputime_callback, NULL, NULL) < 0) {
+ panic("couldn't set thread ledger callback for cpu_time entry");
+ }
+
+ thread_ledgers.cpu_time = idx;
+ thread_ledger_template = t;
+}
+
+/*
+ * Returns currently applied CPU usage limit, or 0/0 if none is applied.
+ */
+int
+thread_get_cpulimit(int *action, uint8_t *percentage, uint64_t *interval_ns)
+{
+ int64_t abstime = 0;
+ uint64_t limittime = 0;
+ thread_t thread = current_thread();
+
+ *percentage = 0;
+ *interval_ns = 0;
+ *action = 0;
+
+ if (thread->t_threadledger == LEDGER_NULL) {
+ /*
+ * This thread has no per-thread ledger, so it can't possibly
+ * have a CPU limit applied.
+ */
+ return (KERN_SUCCESS);
+ }
+
+ ledger_get_period(thread->t_threadledger, thread_ledgers.cpu_time, interval_ns);
+ ledger_get_limit(thread->t_threadledger, thread_ledgers.cpu_time, &abstime);
+
+ if ((abstime == LEDGER_LIMIT_INFINITY) || (*interval_ns == 0)) {
+ /*
+ * This thread's CPU time ledger has no period or limit; so it
+ * doesn't have a CPU limit applied.
+ */
+ return (KERN_SUCCESS);
+ }
+
+ /*
+ * This calculation is the converse to the one in thread_set_cpulimit().
+ */
+ absolutetime_to_nanoseconds(abstime, &limittime);
+ *percentage = (limittime * 100ULL) / *interval_ns;
+ assert(*percentage <= 100);
+
+ if (thread->options & TH_OPT_PROC_CPULIMIT) {
+ assert((thread->options & TH_OPT_PRVT_CPULIMIT) == 0);
+
+ *action = THREAD_CPULIMIT_BLOCK;
+ } else if (thread->options & TH_OPT_PRVT_CPULIMIT) {
+ assert((thread->options & TH_OPT_PROC_CPULIMIT) == 0);
+
+ *action = THREAD_CPULIMIT_EXCEPTION;
+ } else {
+ *action = THREAD_CPULIMIT_DISABLE;
+ }
+
+ return (KERN_SUCCESS);
+}
+
+/*
+ * Set CPU usage limit on a thread.
+ *
+ * Calling with percentage of 0 will unset the limit for this thread.
+ */
+int
+thread_set_cpulimit(int action, uint8_t percentage, uint64_t interval_ns)
+{
+ thread_t thread = current_thread();
+ ledger_t l;
+ uint64_t limittime = 0;
+ uint64_t abstime = 0;
+
+ assert(percentage <= 100);
+
+ if (action == THREAD_CPULIMIT_DISABLE) {
+ /*
+ * Remove CPU limit, if any exists.
+ */
+ if (thread->t_threadledger != LEDGER_NULL) {
+ l = thread->t_threadledger;
+ /*
+ * The only way to get a per-thread ledger is via CPU limits.
+ */
+ assert(thread->options & (TH_OPT_PROC_CPULIMIT | TH_OPT_PRVT_CPULIMIT));
+ thread->t_threadledger = NULL;
+ ledger_dereference(l);
+ thread->options &= ~(TH_OPT_PROC_CPULIMIT | TH_OPT_PRVT_CPULIMIT);
+ }
+
+ return (0);
+ }
+
+ if (interval_ns < MINIMUM_CPULIMIT_INTERVAL_MS * NSEC_PER_MSEC) {
+ return (KERN_INVALID_ARGUMENT);
+ }
+
+ l = thread->t_threadledger;
+ if (l == LEDGER_NULL) {
+ /*
+ * This thread doesn't yet have a per-thread ledger; so create one with the CPU time entry active.
+ */
+ if ((l = ledger_instantiate(thread_ledger_template, LEDGER_CREATE_INACTIVE_ENTRIES)) == LEDGER_NULL)
+ return (KERN_RESOURCE_SHORTAGE);
+
+ /*
+ * We are the first to create this thread's ledger, so only activate our entry.
+ */
+ ledger_entry_setactive(l, thread_ledgers.cpu_time);
+ thread->t_threadledger = l;
+ }
+
+ /*
+ * The limit is specified as a percentage of CPU over an interval in nanoseconds.
+ * Calculate the amount of CPU time that the thread needs to consume in order to hit the limit.
+ */
+ limittime = (interval_ns * percentage) / 100;
+ nanoseconds_to_absolutetime(limittime, &abstime);
+ ledger_set_limit(l, thread_ledgers.cpu_time, abstime, cpumon_ustackshots_trigger_pct);
+ /*
+ * Refill the thread's allotted CPU time every interval_ns nanoseconds.
+ */
+ ledger_set_period(l, thread_ledgers.cpu_time, interval_ns);
+
+ if (action == THREAD_CPULIMIT_EXCEPTION) {
+ /*
+ * We don't support programming the CPU usage monitor on a task if any of its
+ * threads have a per-thread blocking CPU limit configured.
+ */
+ if (thread->options & TH_OPT_PRVT_CPULIMIT) {
+ panic("CPU usage monitor activated, but blocking thread limit exists");
+ }
+
+ /*
+ * Make a note that this thread's CPU limit is being used for the task-wide CPU
+ * usage monitor. We don't have to arm the callback which will trigger the
+ * exception, because that was done for us in ledger_instantiate (because the
+ * ledger template used has a default callback).
+ */
+ thread->options |= TH_OPT_PROC_CPULIMIT;
+ } else {
+ /*
+ * We deliberately override any CPU limit imposed by a task-wide limit (eg
+ * CPU usage monitor).
+ */
+ thread->options &= ~TH_OPT_PROC_CPULIMIT;
+
+ thread->options |= TH_OPT_PRVT_CPULIMIT;
+ /* The per-thread ledger template by default has a callback for CPU time */
+ ledger_disable_callback(l, thread_ledgers.cpu_time);
+ ledger_set_action(l, thread_ledgers.cpu_time, LEDGER_ACTION_BLOCK);
+ }
+
+ return (0);
+}
+
int split_funnel_off = 0;
lck_grp_t *funnel_lck_grp = LCK_GRP_NULL;
lck_grp_attr_t *funnel_lck_grp_attr;
return (thread != THREAD_NULL? thread->thread_id: 0);
}
+uint16_t thread_set_tag(thread_t th, uint16_t tag) {
+ return thread_set_tag_internal(th, tag);
+}
+uint16_t thread_get_tag(thread_t th) {
+ return thread_get_tag_internal(th);
+}
+
uint64_t
thread_dispatchqaddr(
thread_t thread)
uint64_t thread_handle = 0;
if (thread != THREAD_NULL) {
-#if defined(__ppc__) || defined(__arm__)
thread_handle = thread->machine.cthread_self;
-#else
- thread_handle = thread->machine.pcb->cthread_self;
-#endif
if (thread->task->bsd_info)
dispatchqueue_addr = thread_handle + get_dispatchqueue_offset_from_proc(thread->task->bsd_info);
int64_t dtrace_calc_thread_recent_vtime(thread_t thread)
{
-#if STAT_TIME
- if (thread != THREAD_NULL) {
- return timer_grab(&(thread->system_timer)) + timer_grab(&(thread->user_timer));
- } else
- return 0;
-#else
if (thread != THREAD_NULL) {
processor_t processor = current_processor();
uint64_t abstime = mach_absolute_time();
(abstime - timer->tstamp); /* XXX need interrupts off to prevent missed time? */
} else
return 0;
-#endif
}
void dtrace_set_thread_predcache(thread_t thread, uint32_t predcache)
void dtrace_thread_bootstrap(void)
{
task_t task = current_task();
- if(task->thread_count == 1) {
+
+ if (task->thread_count == 1) {
+ thread_t thread = current_thread();
+ if (thread->t_dtrace_flags & TH_DTRACE_EXECSUCCESS) {
+ thread->t_dtrace_flags &= ~TH_DTRACE_EXECSUCCESS;
+ DTRACE_PROC(exec__success);
+ }
DTRACE_PROC(start);
}
DTRACE_PROC(lwp__start);
}
+
+void
+dtrace_thread_didexec(thread_t thread)
+{
+ thread->t_dtrace_flags |= TH_DTRACE_EXECSUCCESS;
+}
#endif /* CONFIG_DTRACE */
projects / apple / xnu.git / blobdiff