* Copyright (c) 1993-2008 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
#include <mach/mach_types.h>
#include <kern/clock.h>
+#include <kern/smp.h>
#include <kern/processor.h>
#include <kern/timer_call.h>
#include <kern/timer_queue.h>
#include <kern/call_entry.h>
#include <kern/thread.h>
+#include <kern/policy_internal.h>
#include <sys/kdebug.h>
#if DEBUG
-#define TIMER_ASSERT 1
+#define TIMER_ASSERT 1
#endif
//#define TIMER_ASSERT 1
#endif
#if TIMER_TRACE
-#define TIMER_KDEBUG_TRACE KERNEL_DEBUG_CONSTANT_IST
+#define TIMER_KDEBUG_TRACE KERNEL_DEBUG_CONSTANT_IST
#else
#define TIMER_KDEBUG_TRACE(x...)
#endif
lck_attr_t timer_longterm_lck_attr;
lck_grp_attr_t timer_longterm_lck_grp_attr;
-
-#define timer_queue_lock_spin(queue) \
+/* Timer queue lock must be acquired with interrupts disabled (under splclock()) */
+#if __SMP__
+#define timer_queue_lock_spin(queue) \
lck_mtx_lock_spin_always(&queue->lock_data)
-#define timer_queue_unlock(queue) \
+#define timer_queue_unlock(queue) \
lck_mtx_unlock_always(&queue->lock_data)
+#else
+#define timer_queue_lock_spin(queue) (void)1
+#define timer_queue_unlock(queue) (void)1
+#endif
-
-#define QUEUE(x) ((queue_t)(x))
-#define MPQUEUE(x) ((mpqueue_head_t *)(x))
-#define TIMER_CALL(x) ((timer_call_t)(x))
-
+#define QUEUE(x) ((queue_t)(x))
+#define MPQUEUE(x) ((mpqueue_head_t *)(x))
+#define TIMER_CALL(x) ((timer_call_t)(x))
+#define TCE(x) (&(x->call_entry))
/*
* The longterm timer object is a global structure holding all timers
* beyond the short-term, local timer queue threshold. The boot processor
* is responsible for moving each timer to its local timer queue
* if and when that timer becomes due within the threshold.
*/
-#define TIMER_LONGTERM_NONE EndOfAllTime
+
+/* Sentinel for "no time set": */
+#define TIMER_LONGTERM_NONE EndOfAllTime
+/* The default threadhold is the delta above which a timer is "long-term" */
#if defined(__x86_64__)
-#define TIMER_LONGTERM_THRESHOLD (1ULL * NSEC_PER_SEC)
+#define TIMER_LONGTERM_THRESHOLD (1ULL * NSEC_PER_SEC) /* 1 sec */
#else
-#define TIMER_LONGTERM_THRESHOLD TIMER_LONGTERM_NONE
+#define TIMER_LONGTERM_THRESHOLD TIMER_LONGTERM_NONE /* disabled */
#endif
+/*
+ * The scan_limit throttles processing of the longterm queue.
+ * If the scan time exceeds this limit, we terminate, unlock
+ * and defer for scan_interval. This prevents unbounded holding of
+ * timer queue locks with interrupts masked.
+ */
+#define TIMER_LONGTERM_SCAN_LIMIT (100ULL * NSEC_PER_USEC) /* 100 us */
+#define TIMER_LONGTERM_SCAN_INTERVAL (100ULL * NSEC_PER_USEC) /* 100 us */
+/* Sentinel for "scan limit exceeded": */
+#define TIMER_LONGTERM_SCAN_AGAIN 0
+
typedef struct {
- uint64_t interval; /* longterm timer interval */
- uint64_t margin; /* fudge factor (10% of interval */
- uint64_t deadline; /* first/soonest longterm deadline */
- uint64_t preempted; /* sooner timer has pre-empted */
- timer_call_t call; /* first/soonest longterm timer call */
- uint64_t deadline_set; /* next timer set */
- timer_call_data_t timer; /* timer used by threshold management */
- /* Stats: */
- uint64_t scans; /* num threshold timer scans */
- uint64_t preempts; /* num threshold reductions */
- uint64_t latency; /* average threshold latency */
- uint64_t latency_min; /* minimum threshold latency */
- uint64_t latency_max; /* maximum threshold latency */
+ uint64_t interval; /* longterm timer interval */
+ uint64_t margin; /* fudge factor (10% of interval */
+ uint64_t deadline; /* first/soonest longterm deadline */
+ uint64_t preempted; /* sooner timer has pre-empted */
+ timer_call_t call; /* first/soonest longterm timer call */
+ uint64_t deadline_set; /* next timer set */
+ timer_call_data_t timer; /* timer used by threshold management */
+ /* Stats: */
+ uint64_t scans; /* num threshold timer scans */
+ uint64_t preempts; /* num threshold reductions */
+ uint64_t latency; /* average threshold latency */
+ uint64_t latency_min; /* minimum threshold latency */
+ uint64_t latency_max; /* maximum threshold latency */
} threshold_t;
typedef struct {
- mpqueue_head_t queue; /* longterm timer list */
- uint64_t enqueues; /* num timers queued */
- uint64_t dequeues; /* num timers dequeued */
- uint64_t escalates; /* num timers becoming shortterm */
- uint64_t scan_time; /* last time the list was scanned */
- threshold_t threshold; /* longterm timer threshold */
+ mpqueue_head_t queue; /* longterm timer list */
+ uint64_t enqueues; /* num timers queued */
+ uint64_t dequeues; /* num timers dequeued */
+ uint64_t escalates; /* num timers becoming shortterm */
+ uint64_t scan_time; /* last time the list was scanned */
+ threshold_t threshold; /* longterm timer threshold */
+ uint64_t scan_limit; /* maximum scan time */
+ uint64_t scan_interval; /* interval between LT "escalation" scans */
+ uint64_t scan_pauses; /* num scans exceeding time limit */
} timer_longterm_t;
-timer_longterm_t timer_longterm;
-
-static mpqueue_head_t *timer_longterm_queue = NULL;
-
-static void timer_longterm_init(void);
-static void timer_longterm_callout(
- timer_call_param_t p0,
- timer_call_param_t p1);
-extern void timer_longterm_scan(
- timer_longterm_t *tlp,
- uint64_t now);
-static void timer_longterm_update(
- timer_longterm_t *tlp);
-static void timer_longterm_update_locked(
- timer_longterm_t *tlp);
-static mpqueue_head_t * timer_longterm_enqueue_unlocked(
- timer_call_t call,
- uint64_t now,
- uint64_t deadline,
- mpqueue_head_t ** old_queue);
-static void timer_longterm_dequeued_locked(
- timer_call_t call);
+timer_longterm_t timer_longterm = {
+ .scan_limit = TIMER_LONGTERM_SCAN_LIMIT,
+ .scan_interval = TIMER_LONGTERM_SCAN_INTERVAL,
+};
+
+static mpqueue_head_t *timer_longterm_queue = NULL;
+
+static void timer_longterm_init(void);
+static void timer_longterm_callout(
+ timer_call_param_t p0,
+ timer_call_param_t p1);
+extern void timer_longterm_scan(
+ timer_longterm_t *tlp,
+ uint64_t now);
+static void timer_longterm_update(
+ timer_longterm_t *tlp);
+static void timer_longterm_update_locked(
+ timer_longterm_t *tlp);
+static mpqueue_head_t * timer_longterm_enqueue_unlocked(
+ timer_call_t call,
+ uint64_t now,
+ uint64_t deadline,
+ mpqueue_head_t ** old_queue,
+ uint64_t soft_deadline,
+ uint64_t ttd,
+ timer_call_param_t param1,
+ uint32_t callout_flags);
+static void timer_longterm_dequeued_locked(
+ timer_call_t call);
uint64_t past_deadline_timers;
uint64_t past_deadline_deltas;
uint64_t past_deadline_timer_adjustment;
static boolean_t timer_call_enter_internal(timer_call_t call, timer_call_param_t param1, uint64_t deadline, uint64_t leeway, uint32_t flags, boolean_t ratelimited);
-boolean_t mach_timer_coalescing_enabled = TRUE;
+boolean_t mach_timer_coalescing_enabled = TRUE;
-mpqueue_head_t *timer_call_enqueue_deadline_unlocked(
- timer_call_t call,
- mpqueue_head_t *queue,
- uint64_t deadline);
+mpqueue_head_t *timer_call_enqueue_deadline_unlocked(
+ timer_call_t call,
+ mpqueue_head_t *queue,
+ uint64_t deadline,
+ uint64_t soft_deadline,
+ uint64_t ttd,
+ timer_call_param_t param1,
+ uint32_t flags);
+
+mpqueue_head_t *timer_call_dequeue_unlocked(
+ timer_call_t call);
+
+timer_coalescing_priority_params_t tcoal_prio_params;
+
+#if TCOAL_PRIO_STATS
+int32_t nc_tcl, rt_tcl, bg_tcl, kt_tcl, fp_tcl, ts_tcl, qos_tcl;
+#define TCOAL_PRIO_STAT(x) (x++)
+#else
+#define TCOAL_PRIO_STAT(x)
+#endif
-mpqueue_head_t *timer_call_dequeue_unlocked(
- timer_call_t call);
+static void
+timer_call_init_abstime(void)
+{
+ int i;
+ uint64_t result;
+ timer_coalescing_priority_params_ns_t * tcoal_prio_params_init = timer_call_get_priority_params();
+ nanoseconds_to_absolutetime(PAST_DEADLINE_TIMER_ADJUSTMENT_NS, &past_deadline_timer_adjustment);
+ nanoseconds_to_absolutetime(tcoal_prio_params_init->idle_entry_timer_processing_hdeadline_threshold_ns, &result);
+ tcoal_prio_params.idle_entry_timer_processing_hdeadline_threshold_abstime = (uint32_t)result;
+ nanoseconds_to_absolutetime(tcoal_prio_params_init->interrupt_timer_coalescing_ilat_threshold_ns, &result);
+ tcoal_prio_params.interrupt_timer_coalescing_ilat_threshold_abstime = (uint32_t)result;
+ nanoseconds_to_absolutetime(tcoal_prio_params_init->timer_resort_threshold_ns, &result);
+ tcoal_prio_params.timer_resort_threshold_abstime = (uint32_t)result;
+ tcoal_prio_params.timer_coalesce_rt_shift = tcoal_prio_params_init->timer_coalesce_rt_shift;
+ tcoal_prio_params.timer_coalesce_bg_shift = tcoal_prio_params_init->timer_coalesce_bg_shift;
+ tcoal_prio_params.timer_coalesce_kt_shift = tcoal_prio_params_init->timer_coalesce_kt_shift;
+ tcoal_prio_params.timer_coalesce_fp_shift = tcoal_prio_params_init->timer_coalesce_fp_shift;
+ tcoal_prio_params.timer_coalesce_ts_shift = tcoal_prio_params_init->timer_coalesce_ts_shift;
+
+ nanoseconds_to_absolutetime(tcoal_prio_params_init->timer_coalesce_rt_ns_max,
+ &tcoal_prio_params.timer_coalesce_rt_abstime_max);
+ nanoseconds_to_absolutetime(tcoal_prio_params_init->timer_coalesce_bg_ns_max,
+ &tcoal_prio_params.timer_coalesce_bg_abstime_max);
+ nanoseconds_to_absolutetime(tcoal_prio_params_init->timer_coalesce_kt_ns_max,
+ &tcoal_prio_params.timer_coalesce_kt_abstime_max);
+ nanoseconds_to_absolutetime(tcoal_prio_params_init->timer_coalesce_fp_ns_max,
+ &tcoal_prio_params.timer_coalesce_fp_abstime_max);
+ nanoseconds_to_absolutetime(tcoal_prio_params_init->timer_coalesce_ts_ns_max,
+ &tcoal_prio_params.timer_coalesce_ts_abstime_max);
+
+ for (i = 0; i < NUM_LATENCY_QOS_TIERS; i++) {
+ tcoal_prio_params.latency_qos_scale[i] = tcoal_prio_params_init->latency_qos_scale[i];
+ nanoseconds_to_absolutetime(tcoal_prio_params_init->latency_qos_ns_max[i],
+ &tcoal_prio_params.latency_qos_abstime_max[i]);
+ tcoal_prio_params.latency_tier_rate_limited[i] = tcoal_prio_params_init->latency_tier_rate_limited[i];
+ }
+}
void
lck_attr_setdefault(&timer_call_lck_attr);
lck_grp_attr_setdefault(&timer_call_lck_grp_attr);
lck_grp_init(&timer_call_lck_grp, "timer_call", &timer_call_lck_grp_attr);
- nanotime_to_absolutetime(0, PAST_DEADLINE_TIMER_ADJUSTMENT_NS, &past_deadline_timer_adjustment);
timer_longterm_init();
+ timer_call_init_abstime();
}
void
timer_call_setup(
- timer_call_t call,
- timer_call_func_t func,
- timer_call_param_t param0)
+ timer_call_t call,
+ timer_call_func_t func,
+ timer_call_param_t param0)
{
DBG("timer_call_setup(%p,%p,%p)\n", call, func, param0);
- call_entry_setup(CE(call), func, param0);
+ call_entry_setup(TCE(call), func, param0);
simple_lock_init(&(call)->lock, 0);
call->async_dequeue = FALSE;
}
-
-/*
- * Timer call entry locking model
- * ==============================
- *
- * Timer call entries are linked on per-cpu timer queues which are protected
- * by the queue lock and the call entry lock. The locking protocol is:
- *
- * 0) The canonical locking order is timer call entry followed by queue.
- *
- * 1) With only the entry lock held, entry.queue is valid:
- * 1a) NULL: the entry is not queued, or
- * 1b) non-NULL: this queue must be locked before the entry is modified.
- * After locking the queue, the call.async_dequeue flag must be checked:
- * 1c) TRUE: the entry was removed from the queue by another thread
- * and we must NULL the entry.queue and reset this flag, or
- * 1d) FALSE: (ie. queued), the entry can be manipulated.
- *
- * 2) If a queue lock is obtained first, the queue is stable:
- * 2a) If a try-lock of a queued entry succeeds, the call can be operated on
- * and dequeued.
- * 2b) If a try-lock fails, it indicates that another thread is attempting
- * to change the entry and move it to a different position in this queue
- * or to different queue. The entry can be dequeued but it should not be
- * operated upon since it is being changed. Furthermore, we don't null
- * the entry.queue pointer (protected by the entry lock we don't own).
- * Instead, we set the async_dequeue flag -- see (1c).
- * 2c) Same as 2b but occurring when a longterm timer is matured.
- */
-
-/*
- * Inlines timer_call_entry_dequeue() and timer_call_entry_enqueue_deadline()
- * cast between pointer types (mpqueue_head_t *) and (queue_t) so that
- * we can use the call_entry_dequeue() and call_entry_enqueue_deadline()
- * methods to operate on timer_call structs as if they are call_entry structs.
- * These structures are identical except for their queue head pointer fields.
- *
- * In the debug case, we assert that the timer call locking protocol
- * is being obeyed.
- */
#if TIMER_ASSERT
static __inline__ mpqueue_head_t *
timer_call_entry_dequeue(
- timer_call_t entry)
+ timer_call_t entry)
{
- mpqueue_head_t *old_queue = MPQUEUE(CE(entry)->queue);
+ mpqueue_head_t *old_queue = MPQUEUE(TCE(entry)->queue);
- if (!hw_lock_held((hw_lock_t)&entry->lock))
+ if (!hw_lock_held((hw_lock_t)&entry->lock)) {
panic("_call_entry_dequeue() "
- "entry %p is not locked\n", entry);
+ "entry %p is not locked\n", entry);
+ }
/*
* XXX The queue lock is actually a mutex in spin mode
* but there's no way to test for it being held
* so we pretend it's a spinlock!
*/
- if (!hw_lock_held((hw_lock_t)&old_queue->lock_data))
+ if (!hw_lock_held((hw_lock_t)&old_queue->lock_data)) {
panic("_call_entry_dequeue() "
- "queue %p is not locked\n", old_queue);
+ "queue %p is not locked\n", old_queue);
+ }
- call_entry_dequeue(CE(entry));
+ call_entry_dequeue(TCE(entry));
old_queue->count--;
- return (old_queue);
+ return old_queue;
}
static __inline__ mpqueue_head_t *
timer_call_entry_enqueue_deadline(
- timer_call_t entry,
- mpqueue_head_t *queue,
- uint64_t deadline)
+ timer_call_t entry,
+ mpqueue_head_t *queue,
+ uint64_t deadline)
{
- mpqueue_head_t *old_queue = MPQUEUE(CE(entry)->queue);
+ mpqueue_head_t *old_queue = MPQUEUE(TCE(entry)->queue);
- if (!hw_lock_held((hw_lock_t)&entry->lock))
+ if (!hw_lock_held((hw_lock_t)&entry->lock)) {
panic("_call_entry_enqueue_deadline() "
- "entry %p is not locked\n", entry);
+ "entry %p is not locked\n", entry);
+ }
/* XXX More lock pretense: */
- if (!hw_lock_held((hw_lock_t)&queue->lock_data))
+ if (!hw_lock_held((hw_lock_t)&queue->lock_data)) {
panic("_call_entry_enqueue_deadline() "
- "queue %p is not locked\n", queue);
- if (old_queue != NULL && old_queue != queue)
+ "queue %p is not locked\n", queue);
+ }
+ if (old_queue != NULL && old_queue != queue) {
panic("_call_entry_enqueue_deadline() "
- "old_queue %p != queue", old_queue);
+ "old_queue %p != queue", old_queue);
+ }
- call_entry_enqueue_deadline(CE(entry), QUEUE(queue), deadline);
+ call_entry_enqueue_deadline(TCE(entry), QUEUE(queue), deadline);
/* For efficiency, track the earliest soft deadline on the queue, so that
* fuzzy decisions can be made without lock acquisitions.
*/
- queue->earliest_soft_deadline = ((timer_call_t)queue_first(&queue->head))->soft_deadline;
+ timer_call_t thead = (timer_call_t)queue_first(&queue->head);
- if (old_queue)
+ queue->earliest_soft_deadline = thead->flags & TIMER_CALL_RATELIMITED ? TCE(thead)->deadline : thead->soft_deadline;
+
+ if (old_queue) {
old_queue->count--;
+ }
queue->count++;
- return (old_queue);
+ return old_queue;
}
#else
static __inline__ mpqueue_head_t *
timer_call_entry_dequeue(
- timer_call_t entry)
+ timer_call_t entry)
{
- mpqueue_head_t *old_queue = MPQUEUE(CE(entry)->queue);
+ mpqueue_head_t *old_queue = MPQUEUE(TCE(entry)->queue);
- call_entry_dequeue(CE(entry));
+ call_entry_dequeue(TCE(entry));
old_queue->count--;
return old_queue;
static __inline__ mpqueue_head_t *
timer_call_entry_enqueue_deadline(
- timer_call_t entry,
- mpqueue_head_t *queue,
- uint64_t deadline)
+ timer_call_t entry,
+ mpqueue_head_t *queue,
+ uint64_t deadline)
{
- mpqueue_head_t *old_queue = MPQUEUE(CE(entry)->queue);
+ mpqueue_head_t *old_queue = MPQUEUE(TCE(entry)->queue);
- call_entry_enqueue_deadline(CE(entry), QUEUE(queue), deadline);
+ call_entry_enqueue_deadline(TCE(entry), QUEUE(queue), deadline);
/* For efficiency, track the earliest soft deadline on the queue,
* so that fuzzy decisions can be made without lock acquisitions.
*/
- queue->earliest_soft_deadline = ((timer_call_t)queue_first(&queue->head))->soft_deadline;
- if (old_queue)
+ timer_call_t thead = (timer_call_t)queue_first(&queue->head);
+ queue->earliest_soft_deadline = thead->flags & TIMER_CALL_RATELIMITED ? TCE(thead)->deadline : thead->soft_deadline;
+
+ if (old_queue) {
old_queue->count--;
+ }
queue->count++;
return old_queue;
static __inline__ void
timer_call_entry_enqueue_tail(
- timer_call_t entry,
- mpqueue_head_t *queue)
+ timer_call_t entry,
+ mpqueue_head_t *queue)
{
- call_entry_enqueue_tail(CE(entry), QUEUE(queue));
+ call_entry_enqueue_tail(TCE(entry), QUEUE(queue));
queue->count++;
return;
}
*/
static __inline__ void
timer_call_entry_dequeue_async(
- timer_call_t entry)
+ timer_call_t entry)
{
- mpqueue_head_t *old_queue = MPQUEUE(CE(entry)->queue);
+ mpqueue_head_t *old_queue = MPQUEUE(TCE(entry)->queue);
if (old_queue) {
old_queue->count--;
(void) remque(qe(entry));
*/
__inline__ mpqueue_head_t *
timer_call_enqueue_deadline_unlocked(
- timer_call_t call,
- mpqueue_head_t *queue,
- uint64_t deadline)
+ timer_call_t call,
+ mpqueue_head_t *queue,
+ uint64_t deadline,
+ uint64_t soft_deadline,
+ uint64_t ttd,
+ timer_call_param_t param1,
+ uint32_t callout_flags)
{
- call_entry_t entry = CE(call);
- mpqueue_head_t *old_queue;
+ call_entry_t entry = TCE(call);
+ mpqueue_head_t *old_queue;
DBG("timer_call_enqueue_deadline_unlocked(%p,%p,)\n", call, queue);
- simple_lock(&call->lock);
+ simple_lock(&call->lock, LCK_GRP_NULL);
+
old_queue = MPQUEUE(entry->queue);
+
if (old_queue != NULL) {
timer_queue_lock_spin(old_queue);
if (call->async_dequeue) {
/* collision (1c): timer already dequeued, clear flag */
#if TIMER_ASSERT
- TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
- call,
- call->async_dequeue,
- CE(call)->queue,
- 0x1c, 0);
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ call->async_dequeue,
+ VM_KERNEL_UNSLIDE_OR_PERM(TCE(call)->queue),
+ 0x1c, 0);
timer_call_enqueue_deadline_unlocked_async1++;
#endif
call->async_dequeue = FALSE;
timer_call_enqueue_deadline_unlocked_async2++;
#endif
}
- if (old_queue == timer_longterm_queue)
+ if (old_queue == timer_longterm_queue) {
timer_longterm_dequeued_locked(call);
+ }
if (old_queue != queue) {
timer_queue_unlock(old_queue);
timer_queue_lock_spin(queue);
timer_queue_lock_spin(queue);
}
+ call->soft_deadline = soft_deadline;
+ call->flags = callout_flags;
+ TCE(call)->param1 = param1;
+ call->ttd = ttd;
+
timer_call_entry_enqueue_deadline(call, queue, deadline);
timer_queue_unlock(queue);
simple_unlock(&call->lock);
- return (old_queue);
+ return old_queue;
}
#if TIMER_ASSERT
#endif
mpqueue_head_t *
timer_call_dequeue_unlocked(
- timer_call_t call)
+ timer_call_t call)
{
- call_entry_t entry = CE(call);
- mpqueue_head_t *old_queue;
+ call_entry_t entry = TCE(call);
+ mpqueue_head_t *old_queue;
DBG("timer_call_dequeue_unlocked(%p)\n", call);
- simple_lock(&call->lock);
+ simple_lock(&call->lock, LCK_GRP_NULL);
old_queue = MPQUEUE(entry->queue);
#if TIMER_ASSERT
- TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
- call,
- call->async_dequeue,
- CE(call)->queue,
- 0, 0);
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ call->async_dequeue,
+ VM_KERNEL_UNSLIDE_OR_PERM(TCE(call)->queue),
+ 0, 0);
#endif
if (old_queue != NULL) {
timer_queue_lock_spin(old_queue);
if (call->async_dequeue) {
/* collision (1c): timer already dequeued, clear flag */
#if TIMER_ASSERT
- TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
- call,
- call->async_dequeue,
- CE(call)->queue,
- 0x1c, 0);
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ call->async_dequeue,
+ VM_KERNEL_UNSLIDE_OR_PERM(TCE(call)->queue),
+ 0x1c, 0);
timer_call_dequeue_unlocked_async1++;
#endif
call->async_dequeue = FALSE;
} else {
timer_call_entry_dequeue(call);
}
- if (old_queue == timer_longterm_queue)
+ if (old_queue == timer_longterm_queue) {
timer_longterm_dequeued_locked(call);
+ }
timer_queue_unlock(old_queue);
}
simple_unlock(&call->lock);
- return (old_queue);
+ return old_queue;
}
-static boolean_t
-timer_call_enter_internal(
- timer_call_t call,
- timer_call_param_t param1,
- uint64_t deadline,
- uint64_t leeway,
- uint32_t flags,
- boolean_t ratelimited)
+static uint64_t
+past_deadline_timer_handle(uint64_t deadline, uint64_t ctime)
{
- mpqueue_head_t *queue = NULL;
- mpqueue_head_t *old_queue;
- spl_t s;
- uint64_t slop;
- uint32_t urgency;
+ uint64_t delta = (ctime - deadline);
- s = splclock();
+ past_deadline_timers++;
+ past_deadline_deltas += delta;
+ if (delta > past_deadline_longest) {
+ past_deadline_longest = deadline;
+ }
+ if (delta < past_deadline_shortest) {
+ past_deadline_shortest = delta;
+ }
- call->soft_deadline = deadline;
- call->flags = flags;
+ return ctime + past_deadline_timer_adjustment;
+}
+/*
+ * Timer call entry locking model
+ * ==============================
+ *
+ * Timer call entries are linked on per-cpu timer queues which are protected
+ * by the queue lock and the call entry lock. The locking protocol is:
+ *
+ * 0) The canonical locking order is timer call entry followed by queue.
+ *
+ * 1) With only the entry lock held, entry.queue is valid:
+ * 1a) NULL: the entry is not queued, or
+ * 1b) non-NULL: this queue must be locked before the entry is modified.
+ * After locking the queue, the call.async_dequeue flag must be checked:
+ * 1c) TRUE: the entry was removed from the queue by another thread
+ * and we must NULL the entry.queue and reset this flag, or
+ * 1d) FALSE: (ie. queued), the entry can be manipulated.
+ *
+ * 2) If a queue lock is obtained first, the queue is stable:
+ * 2a) If a try-lock of a queued entry succeeds, the call can be operated on
+ * and dequeued.
+ * 2b) If a try-lock fails, it indicates that another thread is attempting
+ * to change the entry and move it to a different position in this queue
+ * or to different queue. The entry can be dequeued but it should not be
+ * operated upon since it is being changed. Furthermore, we don't null
+ * the entry.queue pointer (protected by the entry lock we don't own).
+ * Instead, we set the async_dequeue flag -- see (1c).
+ * 2c) Same as 2b but occurring when a longterm timer is matured.
+ * 3) A callout's parameters (deadline, flags, parameters, soft deadline &c.)
+ * should be manipulated with the appropriate timer queue lock held,
+ * to prevent queue traversal observations from observing inconsistent
+ * updates to an in-flight callout.
+ */
+
+/*
+ * Inlines timer_call_entry_dequeue() and timer_call_entry_enqueue_deadline()
+ * cast between pointer types (mpqueue_head_t *) and (queue_t) so that
+ * we can use the call_entry_dequeue() and call_entry_enqueue_deadline()
+ * methods to operate on timer_call structs as if they are call_entry structs.
+ * These structures are identical except for their queue head pointer fields.
+ *
+ * In the debug case, we assert that the timer call locking protocol
+ * is being obeyed.
+ */
+
+static boolean_t
+timer_call_enter_internal(
+ timer_call_t call,
+ timer_call_param_t param1,
+ uint64_t deadline,
+ uint64_t leeway,
+ uint32_t flags,
+ boolean_t ratelimited)
+{
+ mpqueue_head_t *queue = NULL;
+ mpqueue_head_t *old_queue;
+ spl_t s;
+ uint64_t slop;
+ uint32_t urgency;
+ uint64_t sdeadline, ttd;
+
+ assert(call->call_entry.func != NULL);
+ s = splclock();
+
+ sdeadline = deadline;
uint64_t ctime = mach_absolute_time();
TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_ENTER | DBG_FUNC_START,
- call,
- param1, deadline, flags, 0);
+ DECR_TIMER_ENTER | DBG_FUNC_START,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ VM_KERNEL_ADDRHIDE(param1), deadline, flags, 0);
urgency = (flags & TIMER_CALL_URGENCY_MASK);
boolean_t slop_ratelimited = FALSE;
slop = timer_call_slop(deadline, ctime, urgency, current_thread(), &slop_ratelimited);
- if ((flags & TIMER_CALL_LEEWAY) != 0 && leeway > slop)
+ if ((flags & TIMER_CALL_LEEWAY) != 0 && leeway > slop) {
slop = leeway;
+ }
if (UINT64_MAX - deadline <= slop) {
deadline = UINT64_MAX;
}
if (__improbable(deadline < ctime)) {
- uint64_t delta = (ctime - deadline);
-
- past_deadline_timers++;
- past_deadline_deltas += delta;
- if (delta > past_deadline_longest)
- past_deadline_longest = deadline;
- if (delta < past_deadline_shortest)
- past_deadline_shortest = delta;
-
- deadline = ctime + past_deadline_timer_adjustment;
- call->soft_deadline = deadline;
+ deadline = past_deadline_timer_handle(deadline, ctime);
+ sdeadline = deadline;
}
- /* Bit 0 of the "soft" deadline indicates that
- * this particular timer call requires rate-limiting
- * behaviour. Maintain the invariant deadline >= soft_deadline by
- * setting bit 0 of "deadline".
- */
-
- deadline |= 1;
if (ratelimited || slop_ratelimited) {
- call->soft_deadline |= 1ULL;
+ flags |= TIMER_CALL_RATELIMITED;
} else {
- call->soft_deadline &= ~0x1ULL;
+ flags &= ~TIMER_CALL_RATELIMITED;
}
- call->ttd = call->soft_deadline - ctime;
-
+ ttd = sdeadline - ctime;
#if CONFIG_DTRACE
- DTRACE_TMR7(callout__create, timer_call_func_t, CE(call)->func,
- timer_call_param_t, CE(call)->param0, uint32_t, call->flags,
- (deadline - call->soft_deadline),
- (call->ttd >> 32), (unsigned) (call->ttd & 0xFFFFFFFF), call);
+ DTRACE_TMR7(callout__create, timer_call_func_t, TCE(call)->func,
+ timer_call_param_t, TCE(call)->param0, uint32_t, flags,
+ (deadline - sdeadline),
+ (ttd >> 32), (unsigned) (ttd & 0xFFFFFFFF), call);
#endif
+ /* Program timer callout parameters under the appropriate per-CPU or
+ * longterm queue lock. The callout may have been previously enqueued
+ * and in-flight on this or another timer queue.
+ */
if (!ratelimited && !slop_ratelimited) {
- queue = timer_longterm_enqueue_unlocked(call, ctime, deadline, &old_queue);
+ queue = timer_longterm_enqueue_unlocked(call, ctime, deadline, &old_queue, sdeadline, ttd, param1, flags);
}
if (queue == NULL) {
queue = timer_queue_assign(deadline);
- old_queue = timer_call_enqueue_deadline_unlocked(call, queue, deadline);
+ old_queue = timer_call_enqueue_deadline_unlocked(call, queue, deadline, sdeadline, ttd, param1, flags);
}
- CE(call)->param1 = param1;
#if TIMER_TRACE
- CE(call)->entry_time = ctime;
+ TCE(call)->entry_time = ctime;
#endif
TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_ENTER | DBG_FUNC_END,
- call,
- (old_queue != NULL), call->soft_deadline, queue->count, 0);
+ DECR_TIMER_ENTER | DBG_FUNC_END,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ (old_queue != NULL), deadline, queue->count, 0);
splx(s);
- return (old_queue != NULL);
+ return old_queue != NULL;
}
/*
*/
boolean_t
timer_call_enter(
- timer_call_t call,
- uint64_t deadline,
- uint32_t flags)
+ timer_call_t call,
+ uint64_t deadline,
+ uint32_t flags)
{
return timer_call_enter_internal(call, NULL, deadline, 0, flags, FALSE);
}
boolean_t
timer_call_enter1(
- timer_call_t call,
- timer_call_param_t param1,
- uint64_t deadline,
- uint32_t flags)
+ timer_call_t call,
+ timer_call_param_t param1,
+ uint64_t deadline,
+ uint32_t flags)
{
return timer_call_enter_internal(call, param1, deadline, 0, flags, FALSE);
}
boolean_t
timer_call_enter_with_leeway(
- timer_call_t call,
- timer_call_param_t param1,
- uint64_t deadline,
- uint64_t leeway,
- uint32_t flags,
- boolean_t ratelimited)
+ timer_call_t call,
+ timer_call_param_t param1,
+ uint64_t deadline,
+ uint64_t leeway,
+ uint32_t flags,
+ boolean_t ratelimited)
{
return timer_call_enter_internal(call, param1, deadline, leeway, flags, ratelimited);
}
+boolean_t
+timer_call_quantum_timer_enter(
+ timer_call_t call,
+ timer_call_param_t param1,
+ uint64_t deadline,
+ uint64_t ctime)
+{
+ assert(call->call_entry.func != NULL);
+ assert(ml_get_interrupts_enabled() == FALSE);
+
+ uint32_t flags = TIMER_CALL_SYS_CRITICAL | TIMER_CALL_LOCAL;
+
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE, DECR_TIMER_ENTER | DBG_FUNC_START,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ VM_KERNEL_ADDRHIDE(param1), deadline,
+ flags, 0);
+
+ if (__improbable(deadline < ctime)) {
+ deadline = past_deadline_timer_handle(deadline, ctime);
+ }
+
+ uint64_t ttd = deadline - ctime;
+#if CONFIG_DTRACE
+ DTRACE_TMR7(callout__create, timer_call_func_t, TCE(call)->func,
+ timer_call_param_t, TCE(call)->param0, uint32_t, flags, 0,
+ (ttd >> 32), (unsigned) (ttd & 0xFFFFFFFF), call);
+#endif
+
+ quantum_timer_set_deadline(deadline);
+ TCE(call)->deadline = deadline;
+ TCE(call)->param1 = param1;
+ call->ttd = ttd;
+ call->flags = flags;
+
+#if TIMER_TRACE
+ TCE(call)->entry_time = ctime;
+#endif
+
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE, DECR_TIMER_ENTER | DBG_FUNC_END,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ 1, deadline, 0, 0);
+
+ return true;
+}
+
+
+boolean_t
+timer_call_quantum_timer_cancel(
+ timer_call_t call)
+{
+ assert(ml_get_interrupts_enabled() == FALSE);
+
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_CANCEL | DBG_FUNC_START,
+ VM_KERNEL_UNSLIDE_OR_PERM(call), TCE(call)->deadline,
+ 0, call->flags, 0);
+
+ TCE(call)->deadline = 0;
+ quantum_timer_set_deadline(0);
+
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_CANCEL | DBG_FUNC_END,
+ VM_KERNEL_UNSLIDE_OR_PERM(call), 0,
+ TCE(call)->deadline - mach_absolute_time(),
+ TCE(call)->deadline - TCE(call)->entry_time, 0);
+
+#if CONFIG_DTRACE
+ DTRACE_TMR6(callout__cancel, timer_call_func_t, TCE(call)->func,
+ timer_call_param_t, TCE(call)->param0, uint32_t, call->flags, 0,
+ (call->ttd >> 32), (unsigned) (call->ttd & 0xFFFFFFFF));
+#endif
+
+ return true;
+}
+
boolean_t
timer_call_cancel(
- timer_call_t call)
+ timer_call_t call)
{
- mpqueue_head_t *old_queue;
- spl_t s;
+ mpqueue_head_t *old_queue;
+ spl_t s;
s = splclock();
TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_CANCEL | DBG_FUNC_START,
- call,
- CE(call)->deadline, call->soft_deadline, call->flags, 0);
+ DECR_TIMER_CANCEL | DBG_FUNC_START,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ TCE(call)->deadline, call->soft_deadline, call->flags, 0);
old_queue = timer_call_dequeue_unlocked(call);
if (old_queue != NULL) {
timer_queue_lock_spin(old_queue);
if (!queue_empty(&old_queue->head)) {
- timer_queue_cancel(old_queue, CE(call)->deadline, CE(queue_first(&old_queue->head))->deadline);
- old_queue->earliest_soft_deadline = ((timer_call_t)queue_first(&old_queue->head))->soft_deadline;
- }
- else {
- timer_queue_cancel(old_queue, CE(call)->deadline, UINT64_MAX);
+ timer_queue_cancel(old_queue, TCE(call)->deadline, CE(queue_first(&old_queue->head))->deadline);
+ timer_call_t thead = (timer_call_t)queue_first(&old_queue->head);
+ old_queue->earliest_soft_deadline = thead->flags & TIMER_CALL_RATELIMITED ? TCE(thead)->deadline : thead->soft_deadline;
+ } else {
+ timer_queue_cancel(old_queue, TCE(call)->deadline, UINT64_MAX);
old_queue->earliest_soft_deadline = UINT64_MAX;
}
timer_queue_unlock(old_queue);
}
TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_CANCEL | DBG_FUNC_END,
- call,
- old_queue,
- CE(call)->deadline - mach_absolute_time(),
- CE(call)->deadline - CE(call)->entry_time, 0);
+ DECR_TIMER_CANCEL | DBG_FUNC_END,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ VM_KERNEL_UNSLIDE_OR_PERM(old_queue),
+ TCE(call)->deadline - mach_absolute_time(),
+ TCE(call)->deadline - TCE(call)->entry_time, 0);
splx(s);
#if CONFIG_DTRACE
- DTRACE_TMR6(callout__cancel, timer_call_func_t, CE(call)->func,
- timer_call_param_t, CE(call)->param0, uint32_t, call->flags, 0,
+ DTRACE_TMR6(callout__cancel, timer_call_func_t, TCE(call)->func,
+ timer_call_param_t, TCE(call)->param0, uint32_t, call->flags, 0,
(call->ttd >> 32), (unsigned) (call->ttd & 0xFFFFFFFF));
#endif
- return (old_queue != NULL);
+ return old_queue != NULL;
}
-uint32_t timer_queue_shutdown_lock_skips;
+static uint32_t timer_queue_shutdown_lock_skips;
+static uint32_t timer_queue_shutdown_discarded;
+
void
timer_queue_shutdown(
- mpqueue_head_t *queue)
+ mpqueue_head_t *queue)
{
- timer_call_t call;
- mpqueue_head_t *new_queue;
- spl_t s;
+ timer_call_t call;
+ mpqueue_head_t *new_queue;
+ spl_t s;
+
DBG("timer_queue_shutdown(%p)\n", queue);
s = splclock();
/* Note comma operator in while expression re-locking each iteration */
- while (timer_queue_lock_spin(queue), !queue_empty(&queue->head)) {
+ while ((void)timer_queue_lock_spin(queue), !queue_empty(&queue->head)) {
call = TIMER_CALL(queue_first(&queue->head));
- if (!simple_lock_try(&call->lock)) {
+
+ if (!simple_lock_try(&call->lock, LCK_GRP_NULL)) {
/*
* case (2b) lock order inversion, dequeue and skip
* Don't change the call_entry queue back-pointer
timer_queue_shutdown_lock_skips++;
timer_call_entry_dequeue_async(call);
#if TIMER_ASSERT
- TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
- call,
- call->async_dequeue,
- CE(call)->queue,
- 0x2b, 0);
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ call->async_dequeue,
+ VM_KERNEL_UNSLIDE_OR_PERM(TCE(call)->queue),
+ 0x2b, 0);
#endif
timer_queue_unlock(queue);
continue;
}
+ boolean_t call_local = ((call->flags & TIMER_CALL_LOCAL) != 0);
+
/* remove entry from old queue */
timer_call_entry_dequeue(call);
timer_queue_unlock(queue);
- /* and queue it on new */
- new_queue = timer_queue_assign(CE(call)->deadline);
- timer_queue_lock_spin(new_queue);
- timer_call_entry_enqueue_deadline(
- call, new_queue, CE(call)->deadline);
- timer_queue_unlock(new_queue);
+ if (call_local == FALSE) {
+ /* and queue it on new, discarding LOCAL timers */
+ new_queue = timer_queue_assign(TCE(call)->deadline);
+ timer_queue_lock_spin(new_queue);
+ timer_call_entry_enqueue_deadline(
+ call, new_queue, TCE(call)->deadline);
+ timer_queue_unlock(new_queue);
+ } else {
+ timer_queue_shutdown_discarded++;
+ }
+ assert(call_local == FALSE);
simple_unlock(&call->lock);
}
splx(s);
}
-uint32_t timer_queue_expire_lock_skips;
+
+void
+quantum_timer_expire(
+ uint64_t deadline)
+{
+ processor_t processor = current_processor();
+ timer_call_t call = TIMER_CALL(&(processor->quantum_timer));
+
+ if (__improbable(TCE(call)->deadline > deadline)) {
+ panic("CPU quantum timer deadlin out of sync with timer call deadline");
+ }
+
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_EXPIRE | DBG_FUNC_NONE,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ TCE(call)->deadline,
+ TCE(call)->deadline,
+ TCE(call)->entry_time, 0);
+
+ timer_call_func_t func = TCE(call)->func;
+ timer_call_param_t param0 = TCE(call)->param0;
+ timer_call_param_t param1 = TCE(call)->param1;
+
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_CALLOUT | DBG_FUNC_START,
+ VM_KERNEL_UNSLIDE_OR_PERM(call), VM_KERNEL_UNSLIDE(func),
+ VM_KERNEL_ADDRHIDE(param0),
+ VM_KERNEL_ADDRHIDE(param1),
+ 0);
+
+#if CONFIG_DTRACE
+ DTRACE_TMR7(callout__start, timer_call_func_t, func,
+ timer_call_param_t, param0, unsigned, call->flags,
+ 0, (call->ttd >> 32),
+ (unsigned) (call->ttd & 0xFFFFFFFF), call);
+#endif
+ (*func)(param0, param1);
+
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_CALLOUT | DBG_FUNC_END,
+ VM_KERNEL_UNSLIDE_OR_PERM(call), VM_KERNEL_UNSLIDE(func),
+ VM_KERNEL_ADDRHIDE(param0),
+ VM_KERNEL_ADDRHIDE(param1),
+ 0);
+}
+
+static uint32_t timer_queue_expire_lock_skips;
uint64_t
timer_queue_expire_with_options(
- mpqueue_head_t *queue,
- uint64_t deadline,
- boolean_t rescan)
+ mpqueue_head_t *queue,
+ uint64_t deadline,
+ boolean_t rescan)
{
- timer_call_t call = NULL;
+ timer_call_t call = NULL;
uint32_t tc_iterations = 0;
DBG("timer_queue_expire(%p,)\n", queue);
/* Upon processing one or more timer calls, refresh the
* deadline to account for time elapsed in the callout
*/
- if (++tc_iterations > 1)
+ if (++tc_iterations > 1) {
cur_deadline = mach_absolute_time();
+ }
- if (call == NULL)
+ if (call == NULL) {
call = TIMER_CALL(queue_first(&queue->head));
+ }
if (call->soft_deadline <= cur_deadline) {
- timer_call_func_t func;
- timer_call_param_t param0, param1;
+ timer_call_func_t func;
+ timer_call_param_t param0, param1;
TCOAL_DEBUG(0xDDDD0000, queue->earliest_soft_deadline, call->soft_deadline, 0, 0, 0);
- TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_EXPIRE | DBG_FUNC_NONE,
- call,
- call->soft_deadline,
- CE(call)->deadline,
- CE(call)->entry_time, 0);
-
- /* Bit 0 of the "soft" deadline indicates that
- * this particular timer call is rate-limited
- * and hence shouldn't be processed before its
- * hard deadline.
- */
- if ((call->soft_deadline & 0x1) &&
- (CE(call)->deadline > cur_deadline)) {
- if (rescan == FALSE)
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_EXPIRE | DBG_FUNC_NONE,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ call->soft_deadline,
+ TCE(call)->deadline,
+ TCE(call)->entry_time, 0);
+
+ if ((call->flags & TIMER_CALL_RATELIMITED) &&
+ (TCE(call)->deadline > cur_deadline)) {
+ if (rescan == FALSE) {
break;
+ }
}
- if (!simple_lock_try(&call->lock)) {
+ if (!simple_lock_try(&call->lock, LCK_GRP_NULL)) {
/* case (2b) lock inversion, dequeue and skip */
timer_queue_expire_lock_skips++;
timer_call_entry_dequeue_async(call);
timer_call_entry_dequeue(call);
- func = CE(call)->func;
- param0 = CE(call)->param0;
- param1 = CE(call)->param1;
+ func = TCE(call)->func;
+ param0 = TCE(call)->param0;
+ param1 = TCE(call)->param1;
simple_unlock(&call->lock);
timer_queue_unlock(queue);
- TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_CALLOUT | DBG_FUNC_START,
- call, VM_KERNEL_UNSLIDE(func), param0, param1, 0);
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_CALLOUT | DBG_FUNC_START,
+ VM_KERNEL_UNSLIDE_OR_PERM(call), VM_KERNEL_UNSLIDE(func),
+ VM_KERNEL_ADDRHIDE(param0),
+ VM_KERNEL_ADDRHIDE(param1),
+ 0);
#if CONFIG_DTRACE
DTRACE_TMR7(callout__start, timer_call_func_t, func,
param0, param1, call);
#endif
- TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_CALLOUT | DBG_FUNC_END,
- call, VM_KERNEL_UNSLIDE(func), param0, param1, 0);
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_CALLOUT | DBG_FUNC_END,
+ VM_KERNEL_UNSLIDE_OR_PERM(call), VM_KERNEL_UNSLIDE(func),
+ VM_KERNEL_ADDRHIDE(param0),
+ VM_KERNEL_ADDRHIDE(param1),
+ 0);
call = NULL;
timer_queue_lock_spin(queue);
} else {
if (__probable(rescan == FALSE)) {
break;
} else {
- int64_t skew = CE(call)->deadline - call->soft_deadline;
- assert(CE(call)->deadline >= call->soft_deadline);
+ int64_t skew = TCE(call)->deadline - call->soft_deadline;
+ assert(TCE(call)->deadline >= call->soft_deadline);
/* DRK: On a latency quality-of-service level change,
* re-sort potentially rate-limited timers. The platform
* annuls all timer adjustments, i.e. the "soft
* deadline" is the sort key.
*/
-
+
if (timer_resort_threshold(skew)) {
- if (__probable(simple_lock_try(&call->lock))) {
+ if (__probable(simple_lock_try(&call->lock, LCK_GRP_NULL))) {
timer_call_entry_dequeue(call);
timer_call_entry_enqueue_deadline(call, queue, call->soft_deadline);
simple_unlock(&call->lock);
}
if (call) {
call = TIMER_CALL(queue_next(qe(call)));
- if (queue_end(&queue->head, qe(call)))
+ if (queue_end(&queue->head, qe(call))) {
break;
+ }
}
}
}
if (!queue_empty(&queue->head)) {
call = TIMER_CALL(queue_first(&queue->head));
- cur_deadline = CE(call)->deadline;
- queue->earliest_soft_deadline = call->soft_deadline;
+ cur_deadline = TCE(call)->deadline;
+ queue->earliest_soft_deadline = (call->flags & TIMER_CALL_RATELIMITED) ? TCE(call)->deadline: call->soft_deadline;
} else {
queue->earliest_soft_deadline = cur_deadline = UINT64_MAX;
}
timer_queue_unlock(queue);
- return (cur_deadline);
+ return cur_deadline;
}
uint64_t
timer_queue_expire(
- mpqueue_head_t *queue,
- uint64_t deadline)
+ mpqueue_head_t *queue,
+ uint64_t deadline)
{
return timer_queue_expire_with_options(queue, deadline, FALSE);
}
extern int serverperfmode;
-uint32_t timer_queue_migrate_lock_skips;
+static uint32_t timer_queue_migrate_lock_skips;
/*
* timer_queue_migrate() is called by timer_queue_migrate_cpu()
* to move timer requests from the local processor (queue_from)
int
timer_queue_migrate(mpqueue_head_t *queue_from, mpqueue_head_t *queue_to)
{
- timer_call_t call;
- timer_call_t head_to;
- int timers_migrated = 0;
+ timer_call_t call;
+ timer_call_t head_to;
+ int timers_migrated = 0;
DBG("timer_queue_migrate(%p,%p)\n", queue_from, queue_to);
* so that we need not have the target resync.
*/
- timer_queue_lock_spin(queue_to);
+ timer_queue_lock_spin(queue_to);
head_to = TIMER_CALL(queue_first(&queue_to->head));
if (queue_empty(&queue_to->head)) {
goto abort1;
}
- timer_queue_lock_spin(queue_from);
+ timer_queue_lock_spin(queue_from);
if (queue_empty(&queue_from->head)) {
timers_migrated = -2;
}
call = TIMER_CALL(queue_first(&queue_from->head));
- if (CE(call)->deadline < CE(head_to)->deadline) {
+ if (TCE(call)->deadline < TCE(head_to)->deadline) {
timers_migrated = 0;
goto abort2;
}
/* migration loop itself -- both queues are locked */
while (!queue_empty(&queue_from->head)) {
call = TIMER_CALL(queue_first(&queue_from->head));
- if (!simple_lock_try(&call->lock)) {
+ if (!simple_lock_try(&call->lock, LCK_GRP_NULL)) {
/* case (2b) lock order inversion, dequeue only */
#ifdef TIMER_ASSERT
- TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
- call,
- CE(call)->queue,
- call->lock.interlock.lock_data,
- 0x2b, 0);
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ VM_KERNEL_UNSLIDE_OR_PERM(TCE(call)->queue),
+ VM_KERNEL_UNSLIDE_OR_PERM(call->lock.interlock.lock_data),
+ 0x2b, 0);
#endif
timer_queue_migrate_lock_skips++;
timer_call_entry_dequeue_async(call);
}
timer_call_entry_dequeue(call);
timer_call_entry_enqueue_deadline(
- call, queue_to, CE(call)->deadline);
+ call, queue_to, TCE(call)->deadline);
timers_migrated++;
simple_unlock(&call->lock);
}
queue_from->earliest_soft_deadline = UINT64_MAX;
abort2:
- timer_queue_unlock(queue_from);
+ timer_queue_unlock(queue_from);
abort1:
- timer_queue_unlock(queue_to);
+ timer_queue_unlock(queue_to);
return timers_migrated;
}
{
timer_call_nosync_cpu(
ncpu,
- (void(*)())timer_queue_trace,
+ (void (*)(void *))timer_queue_trace,
(void*) timer_queue_cpu(ncpu));
}
void
timer_queue_trace(
- mpqueue_head_t *queue)
+ mpqueue_head_t *queue)
{
- timer_call_t call;
- spl_t s;
+ timer_call_t call;
+ spl_t s;
- if (!kdebug_enable)
+ if (!kdebug_enable) {
return;
+ }
s = splclock();
timer_queue_lock_spin(queue);
TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_QUEUE | DBG_FUNC_START,
- queue->count, mach_absolute_time(), 0, 0, 0);
+ DECR_TIMER_QUEUE | DBG_FUNC_START,
+ queue->count, mach_absolute_time(), 0, 0, 0);
if (!queue_empty(&queue->head)) {
call = TIMER_CALL(queue_first(&queue->head));
do {
TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_QUEUE | DBG_FUNC_NONE,
- call->soft_deadline,
- CE(call)->deadline,
- CE(call)->entry_time,
- CE(call)->func,
- 0);
+ DECR_TIMER_QUEUE | DBG_FUNC_NONE,
+ call->soft_deadline,
+ TCE(call)->deadline,
+ TCE(call)->entry_time,
+ VM_KERNEL_UNSLIDE(TCE(call)->func),
+ 0);
call = TIMER_CALL(queue_next(qe(call)));
} while (!queue_end(&queue->head, qe(call)));
}
TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_QUEUE | DBG_FUNC_END,
- queue->count, mach_absolute_time(), 0, 0, 0);
+ DECR_TIMER_QUEUE | DBG_FUNC_END,
+ queue->count, mach_absolute_time(), 0, 0, 0);
timer_queue_unlock(queue);
splx(s);
void
timer_longterm_dequeued_locked(timer_call_t call)
{
- timer_longterm_t *tlp = &timer_longterm;
+ timer_longterm_t *tlp = &timer_longterm;
tlp->dequeues++;
- if (call == tlp->threshold.call)
+ if (call == tlp->threshold.call) {
tlp->threshold.call = NULL;
+ }
}
/*
* and adjust the next timer callout deadline if the new timer is first.
*/
mpqueue_head_t *
-timer_longterm_enqueue_unlocked(timer_call_t call,
- uint64_t now,
- uint64_t deadline,
- mpqueue_head_t **old_queue)
+timer_longterm_enqueue_unlocked(timer_call_t call,
+ uint64_t now,
+ uint64_t deadline,
+ mpqueue_head_t **old_queue,
+ uint64_t soft_deadline,
+ uint64_t ttd,
+ timer_call_param_t param1,
+ uint32_t callout_flags)
{
- timer_longterm_t *tlp = &timer_longterm;
- boolean_t update_required = FALSE;
- uint64_t longterm_threshold;
+ timer_longterm_t *tlp = &timer_longterm;
+ boolean_t update_required = FALSE;
+ uint64_t longterm_threshold;
longterm_threshold = now + tlp->threshold.interval;
* - the longterm mechanism is disabled, or
* - this deadline is too short.
*/
- if (__probable((call->flags & TIMER_CALL_LOCAL) != 0 ||
+ if ((callout_flags & TIMER_CALL_LOCAL) != 0 ||
(tlp->threshold.interval == TIMER_LONGTERM_NONE) ||
- (deadline <= longterm_threshold)))
+ (deadline <= longterm_threshold)) {
return NULL;
+ }
/*
- * Remove timer from its current queue, if any.
+ * Remove timer from its current queue, if any.
*/
*old_queue = timer_call_dequeue_unlocked(call);
* whether an update is necessary.
*/
assert(!ml_get_interrupts_enabled());
- simple_lock(&call->lock);
+ simple_lock(&call->lock, LCK_GRP_NULL);
timer_queue_lock_spin(timer_longterm_queue);
+ TCE(call)->deadline = deadline;
+ TCE(call)->param1 = param1;
+ call->ttd = ttd;
+ call->soft_deadline = soft_deadline;
+ call->flags = callout_flags;
timer_call_entry_enqueue_tail(call, timer_longterm_queue);
- CE(call)->deadline = deadline;
-
+
tlp->enqueues++;
/*
* We'll need to update the currently set threshold timer
* if the new deadline is sooner and no sooner update is in flight.
- */
+ */
if (deadline < tlp->threshold.deadline &&
deadline < tlp->threshold.preempted) {
tlp->threshold.preempted = deadline;
}
timer_queue_unlock(timer_longterm_queue);
simple_unlock(&call->lock);
-
+
if (update_required) {
+ /*
+ * Note: this call expects that calling the master cpu
+ * alone does not involve locking the topo lock.
+ */
timer_call_nosync_cpu(
master_cpu,
- (void (*)(void *)) timer_longterm_update,
+ (void (*)(void *))timer_longterm_update,
(void *)tlp);
}
* The scan is similar to the timer migrate sequence but is performed by
* successively examining each timer on the longterm queue:
* - if within the short-term threshold
- * - enter on the local queue (unless being deleted),
+ * - enter on the local queue (unless being deleted),
* - otherwise:
* - if sooner, deadline becomes the next threshold deadline.
+ * The total scan time is limited to TIMER_LONGTERM_SCAN_LIMIT. Should this be
+ * exceeded, we abort and reschedule again so that we don't shut others from
+ * the timer queues. Longterm timers firing late is not critical.
*/
void
-timer_longterm_scan(timer_longterm_t *tlp,
- uint64_t now)
+timer_longterm_scan(timer_longterm_t *tlp,
+ uint64_t time_start)
{
- queue_entry_t qe;
- timer_call_t call;
- uint64_t threshold;
- uint64_t deadline;
- mpqueue_head_t *timer_master_queue;
+ queue_entry_t qe;
+ timer_call_t call;
+ uint64_t threshold;
+ uint64_t deadline;
+ uint64_t time_limit = time_start + tlp->scan_limit;
+ mpqueue_head_t *timer_master_queue;
assert(!ml_get_interrupts_enabled());
assert(cpu_number() == master_cpu);
- if (tlp->threshold.interval != TIMER_LONGTERM_NONE)
- threshold = now + tlp->threshold.interval;
- else
- threshold = TIMER_LONGTERM_NONE;
+ if (tlp->threshold.interval != TIMER_LONGTERM_NONE) {
+ threshold = time_start + tlp->threshold.interval;
+ }
tlp->threshold.deadline = TIMER_LONGTERM_NONE;
tlp->threshold.call = NULL;
- if (queue_empty(&timer_longterm_queue->head))
+ if (queue_empty(&timer_longterm_queue->head)) {
return;
+ }
timer_master_queue = timer_queue_cpu(master_cpu);
timer_queue_lock_spin(timer_master_queue);
call = TIMER_CALL(qe);
deadline = call->soft_deadline;
qe = queue_next(qe);
- if (!simple_lock_try(&call->lock)) {
+ if (!simple_lock_try(&call->lock, LCK_GRP_NULL)) {
/* case (2c) lock order inversion, dequeue only */
#ifdef TIMER_ASSERT
TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
- call,
- CE(call)->queue,
- call->lock.interlock.lock_data,
- 0x2c, 0);
+ DECR_TIMER_ASYNC_DEQ | DBG_FUNC_NONE,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ VM_KERNEL_UNSLIDE_OR_PERM(TCE(call)->queue),
+ VM_KERNEL_UNSLIDE_OR_PERM(call->lock.interlock.lock_data),
+ 0x2c, 0);
#endif
timer_call_entry_dequeue_async(call);
continue;
* to the local (boot) processor's queue.
*/
#ifdef TIMER_ASSERT
- if (deadline < now)
+ if (deadline < time_start) {
TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_OVERDUE | DBG_FUNC_NONE,
- call,
- deadline,
- now,
- threshold,
- 0);
+ DECR_TIMER_OVERDUE | DBG_FUNC_NONE,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ deadline,
+ time_start,
+ threshold,
+ 0);
+ }
#endif
TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_ESCALATE | DBG_FUNC_NONE,
- call,
- CE(call)->deadline,
- CE(call)->entry_time,
- CE(call)->func,
- 0);
+ DECR_TIMER_ESCALATE | DBG_FUNC_NONE,
+ VM_KERNEL_UNSLIDE_OR_PERM(call),
+ TCE(call)->deadline,
+ TCE(call)->entry_time,
+ VM_KERNEL_UNSLIDE(TCE(call)->func),
+ 0);
tlp->escalates++;
timer_call_entry_dequeue(call);
timer_call_entry_enqueue_deadline(
- call, timer_master_queue, CE(call)->deadline);
+ call, timer_master_queue, TCE(call)->deadline);
/*
* A side-effect of the following call is to update
* the actual hardware deadline if required.
}
}
simple_unlock(&call->lock);
+
+ /* Abort scan if we're taking too long. */
+ if (mach_absolute_time() > time_limit) {
+ tlp->threshold.deadline = TIMER_LONGTERM_SCAN_AGAIN;
+ tlp->scan_pauses++;
+ DBG("timer_longterm_scan() paused %llu, qlen: %llu\n",
+ time_limit, tlp->queue.count);
+ break;
+ }
}
timer_queue_unlock(timer_master_queue);
void
timer_longterm_callout(timer_call_param_t p0, __unused timer_call_param_t p1)
{
- timer_longterm_t *tlp = (timer_longterm_t *) p0;
+ timer_longterm_t *tlp = (timer_longterm_t *) p0;
timer_longterm_update(tlp);
}
void
timer_longterm_update_locked(timer_longterm_t *tlp)
{
- uint64_t latency;
+ uint64_t latency;
- TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_UPDATE | DBG_FUNC_START,
- &tlp->queue,
- tlp->threshold.deadline,
- tlp->threshold.preempted,
- tlp->queue.count, 0);
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_UPDATE | DBG_FUNC_START,
+ VM_KERNEL_UNSLIDE_OR_PERM(&tlp->queue),
+ tlp->threshold.deadline,
+ tlp->threshold.preempted,
+ tlp->queue.count, 0);
tlp->scan_time = mach_absolute_time();
if (tlp->threshold.preempted != TIMER_LONGTERM_NONE) {
* Maintain a moving average of our wakeup latency.
* Clamp latency to 0 and ignore above threshold interval.
*/
- if (tlp->scan_time > tlp->threshold.deadline_set)
+ if (tlp->scan_time > tlp->threshold.deadline_set) {
latency = tlp->scan_time - tlp->threshold.deadline_set;
- else
+ } else {
latency = 0;
+ }
if (latency < tlp->threshold.interval) {
tlp->threshold.latency_min =
- MIN(tlp->threshold.latency_min, latency);
+ MIN(tlp->threshold.latency_min, latency);
tlp->threshold.latency_max =
- MAX(tlp->threshold.latency_max, latency);
+ MAX(tlp->threshold.latency_max, latency);
tlp->threshold.latency =
- (tlp->threshold.latency*99 + latency) / 100;
+ (tlp->threshold.latency * 99 + latency) / 100;
}
- timer_longterm_scan(tlp, tlp->scan_time);
+ timer_longterm_scan(tlp, tlp->scan_time);
}
tlp->threshold.deadline_set = tlp->threshold.deadline;
/* The next deadline timer to be set is adjusted */
- if (tlp->threshold.deadline != TIMER_LONGTERM_NONE) {
+ if (tlp->threshold.deadline != TIMER_LONGTERM_NONE &&
+ tlp->threshold.deadline != TIMER_LONGTERM_SCAN_AGAIN) {
tlp->threshold.deadline_set -= tlp->threshold.margin;
tlp->threshold.deadline_set -= tlp->threshold.latency;
}
- TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
- DECR_TIMER_UPDATE | DBG_FUNC_END,
- &tlp->queue,
- tlp->threshold.deadline,
- tlp->threshold.scans,
- tlp->queue.count, 0);
+ /* Throttle next scan time */
+ uint64_t scan_clamp = mach_absolute_time() + tlp->scan_interval;
+ if (tlp->threshold.deadline_set < scan_clamp) {
+ tlp->threshold.deadline_set = scan_clamp;
+ }
+
+ TIMER_KDEBUG_TRACE(KDEBUG_TRACE,
+ DECR_TIMER_UPDATE | DBG_FUNC_END,
+ VM_KERNEL_UNSLIDE_OR_PERM(&tlp->queue),
+ tlp->threshold.deadline,
+ tlp->threshold.scans,
+ tlp->queue.count, 0);
}
void
timer_longterm_update(timer_longterm_t *tlp)
{
- spl_t s = splclock();
+ spl_t s = splclock();
timer_queue_lock_spin(timer_longterm_queue);
- if (cpu_number() != master_cpu)
+ if (cpu_number() != master_cpu) {
panic("timer_longterm_update_master() on non-boot cpu");
+ }
timer_longterm_update_locked(tlp);
- if (tlp->threshold.deadline != TIMER_LONGTERM_NONE)
+ if (tlp->threshold.deadline != TIMER_LONGTERM_NONE) {
timer_call_enter(
&tlp->threshold.timer,
tlp->threshold.deadline_set,
TIMER_CALL_LOCAL | TIMER_CALL_SYS_CRITICAL);
-
+ }
+
timer_queue_unlock(timer_longterm_queue);
splx(s);
}
void
timer_longterm_init(void)
{
- uint32_t longterm;
- timer_longterm_t *tlp = &timer_longterm;
+ uint32_t longterm;
+ timer_longterm_t *tlp = &timer_longterm;
DBG("timer_longterm_init() tlp: %p, queue: %p\n", tlp, &tlp->queue);
/*
- * Set the longterm timer threshold.
- * Defaults to TIMER_LONGTERM_THRESHOLD; overridden longterm boot-arg
+ * Set the longterm timer threshold. Defaults to TIMER_LONGTERM_THRESHOLD
+ * or TIMER_LONGTERM_NONE (disabled) for server;
+ * overridden longterm boot-arg
*/
- tlp->threshold.interval = TIMER_LONGTERM_THRESHOLD;
- if (PE_parse_boot_argn("longterm", &longterm, sizeof (longterm))) {
+ tlp->threshold.interval = serverperfmode ? TIMER_LONGTERM_NONE
+ : TIMER_LONGTERM_THRESHOLD;
+ if (PE_parse_boot_argn("longterm", &longterm, sizeof(longterm))) {
tlp->threshold.interval = (longterm == 0) ?
- TIMER_LONGTERM_NONE :
- longterm * NSEC_PER_MSEC;
+ TIMER_LONGTERM_NONE :
+ longterm * NSEC_PER_MSEC;
}
if (tlp->threshold.interval != TIMER_LONGTERM_NONE) {
printf("Longterm timer threshold: %llu ms\n",
- tlp->threshold.interval / NSEC_PER_MSEC);
+ tlp->threshold.interval / NSEC_PER_MSEC);
kprintf("Longterm timer threshold: %llu ms\n",
- tlp->threshold.interval / NSEC_PER_MSEC);
+ tlp->threshold.interval / NSEC_PER_MSEC);
nanoseconds_to_absolutetime(tlp->threshold.interval,
- &tlp->threshold.interval);
+ &tlp->threshold.interval);
tlp->threshold.margin = tlp->threshold.interval / 10;
tlp->threshold.latency_min = EndOfAllTime;
tlp->threshold.latency_max = 0;
lck_attr_setdefault(&timer_longterm_lck_attr);
lck_grp_attr_setdefault(&timer_longterm_lck_grp_attr);
lck_grp_init(&timer_longterm_lck_grp,
- "timer_longterm", &timer_longterm_lck_grp_attr);
+ "timer_longterm", &timer_longterm_lck_grp_attr);
mpqueue_init(&tlp->queue,
- &timer_longterm_lck_grp, &timer_longterm_lck_attr);
+ &timer_longterm_lck_grp, &timer_longterm_lck_attr);
timer_call_setup(&tlp->threshold.timer,
- timer_longterm_callout, (timer_call_param_t) tlp);
+ timer_longterm_callout, (timer_call_param_t) tlp);
timer_longterm_queue = &tlp->queue;
}
enum {
THRESHOLD, QCOUNT,
ENQUEUES, DEQUEUES, ESCALATES, SCANS, PREEMPTS,
- LATENCY, LATENCY_MIN, LATENCY_MAX
+ LATENCY, LATENCY_MIN, LATENCY_MAX, SCAN_LIMIT, SCAN_INTERVAL, PAUSES
};
uint64_t
timer_sysctl_get(int oid)
{
- timer_longterm_t *tlp = &timer_longterm;
+ timer_longterm_t *tlp = &timer_longterm;
switch (oid) {
case THRESHOLD:
return (tlp->threshold.interval == TIMER_LONGTERM_NONE) ?
- 0 : tlp->threshold.interval / NSEC_PER_MSEC;
+ 0 : tlp->threshold.interval / NSEC_PER_MSEC;
case QCOUNT:
return tlp->queue.count;
case ENQUEUES:
return tlp->threshold.latency_min;
case LATENCY_MAX:
return tlp->threshold.latency_max;
+ case SCAN_LIMIT:
+ return tlp->scan_limit;
+ case SCAN_INTERVAL:
+ return tlp->scan_interval;
+ case PAUSES:
+ return tlp->scan_pauses;
default:
return 0;
}
* since it un-escalates timers to the longterm queue.
*/
static void
-timer_master_scan(timer_longterm_t *tlp,
- uint64_t now)
+timer_master_scan(timer_longterm_t *tlp,
+ uint64_t now)
{
- queue_entry_t qe;
- timer_call_t call;
- uint64_t threshold;
- uint64_t deadline;
- mpqueue_head_t *timer_master_queue;
+ queue_entry_t qe;
+ timer_call_t call;
+ uint64_t threshold;
+ uint64_t deadline;
+ mpqueue_head_t *timer_master_queue;
- if (tlp->threshold.interval != TIMER_LONGTERM_NONE)
+ if (tlp->threshold.interval != TIMER_LONGTERM_NONE) {
threshold = now + tlp->threshold.interval;
- else
+ } else {
threshold = TIMER_LONGTERM_NONE;
+ }
timer_master_queue = timer_queue_cpu(master_cpu);
timer_queue_lock_spin(timer_master_queue);
qe = queue_first(&timer_master_queue->head);
while (!queue_end(&timer_master_queue->head, qe)) {
call = TIMER_CALL(qe);
- deadline = CE(call)->deadline;
+ deadline = TCE(call)->deadline;
qe = queue_next(qe);
- if ((call->flags & TIMER_CALL_LOCAL) != 0)
+ if ((call->flags & TIMER_CALL_LOCAL) != 0) {
continue;
- if (!simple_lock_try(&call->lock)) {
+ }
+ if (!simple_lock_try(&call->lock, LCK_GRP_NULL)) {
/* case (2c) lock order inversion, dequeue only */
timer_call_entry_dequeue_async(call);
continue;
static void
timer_sysctl_set_threshold(uint64_t value)
{
- timer_longterm_t *tlp = &timer_longterm;
- spl_t s = splclock();
- boolean_t threshold_increase;
+ timer_longterm_t *tlp = &timer_longterm;
+ spl_t s = splclock();
+ boolean_t threshold_increase;
timer_queue_lock_spin(timer_longterm_queue);
threshold_increase = TRUE;
timer_call_cancel(&tlp->threshold.timer);
} else {
- uint64_t old_interval = tlp->threshold.interval;
+ uint64_t old_interval = tlp->threshold.interval;
tlp->threshold.interval = value * NSEC_PER_MSEC;
nanoseconds_to_absolutetime(tlp->threshold.interval,
- &tlp->threshold.interval);
+ &tlp->threshold.interval);
tlp->threshold.margin = tlp->threshold.interval / 10;
- if (old_interval == TIMER_LONGTERM_NONE)
+ if (old_interval == TIMER_LONGTERM_NONE) {
threshold_increase = FALSE;
- else
+ } else {
threshold_increase = (tlp->threshold.interval > old_interval);
+ }
}
if (threshold_increase /* or removal */) {
/* Escalate timers from the longterm queue */
timer_longterm_scan(tlp, mach_absolute_time());
- } else /* decrease or addition */ {
+ } else { /* decrease or addition */
/*
* We scan the local/master queue for timers now longterm.
* To be strictly correct, we should scan all processor queues
tlp->enqueues = 0;
tlp->dequeues = 0;
tlp->escalates = 0;
+ tlp->scan_pauses = 0;
tlp->threshold.scans = 0;
tlp->threshold.preempts = 0;
tlp->threshold.latency = 0;
case THRESHOLD:
timer_call_cpu(
master_cpu,
- (void (*)(void *)) timer_sysctl_set_threshold,
+ (void (*)(void *))timer_sysctl_set_threshold,
(void *) value);
return KERN_SUCCESS;
+ case SCAN_LIMIT:
+ timer_longterm.scan_limit = value;
+ return KERN_SUCCESS;
+ case SCAN_INTERVAL:
+ timer_longterm.scan_interval = value;
+ return KERN_SUCCESS;
default:
return KERN_INVALID_ARGUMENT;
}
}
+
+
+/* Select timer coalescing window based on per-task quality-of-service hints */
+static boolean_t
+tcoal_qos_adjust(thread_t t, int32_t *tshift, uint64_t *tmax_abstime, boolean_t *pratelimited)
+{
+ uint32_t latency_qos;
+ boolean_t adjusted = FALSE;
+ task_t ctask = t->task;
+
+ if (ctask) {
+ latency_qos = proc_get_effective_thread_policy(t, TASK_POLICY_LATENCY_QOS);
+
+ assert(latency_qos <= NUM_LATENCY_QOS_TIERS);
+
+ if (latency_qos) {
+ *tshift = tcoal_prio_params.latency_qos_scale[latency_qos - 1];
+ *tmax_abstime = tcoal_prio_params.latency_qos_abstime_max[latency_qos - 1];
+ *pratelimited = tcoal_prio_params.latency_tier_rate_limited[latency_qos - 1];
+ adjusted = TRUE;
+ }
+ }
+ return adjusted;
+}
+
+
+/* Adjust timer deadlines based on priority of the thread and the
+ * urgency value provided at timeout establishment. With this mechanism,
+ * timers are no longer necessarily sorted in order of soft deadline
+ * on a given timer queue, i.e. they may be differentially skewed.
+ * In the current scheme, this could lead to fewer pending timers
+ * processed than is technically possible when the HW deadline arrives.
+ */
+static void
+timer_compute_leeway(thread_t cthread, int32_t urgency, int32_t *tshift, uint64_t *tmax_abstime, boolean_t *pratelimited)
+{
+ int16_t tpri = cthread->sched_pri;
+ if ((urgency & TIMER_CALL_USER_MASK) != 0) {
+ if (tpri >= BASEPRI_RTQUEUES ||
+ urgency == TIMER_CALL_USER_CRITICAL) {
+ *tshift = tcoal_prio_params.timer_coalesce_rt_shift;
+ *tmax_abstime = tcoal_prio_params.timer_coalesce_rt_abstime_max;
+ TCOAL_PRIO_STAT(rt_tcl);
+ } else if (proc_get_effective_thread_policy(cthread, TASK_POLICY_DARWIN_BG) ||
+ (urgency == TIMER_CALL_USER_BACKGROUND)) {
+ /* Determine if timer should be subjected to a lower QoS */
+ if (tcoal_qos_adjust(cthread, tshift, tmax_abstime, pratelimited)) {
+ if (*tmax_abstime > tcoal_prio_params.timer_coalesce_bg_abstime_max) {
+ return;
+ } else {
+ *pratelimited = FALSE;
+ }
+ }
+ *tshift = tcoal_prio_params.timer_coalesce_bg_shift;
+ *tmax_abstime = tcoal_prio_params.timer_coalesce_bg_abstime_max;
+ TCOAL_PRIO_STAT(bg_tcl);
+ } else if (tpri >= MINPRI_KERNEL) {
+ *tshift = tcoal_prio_params.timer_coalesce_kt_shift;
+ *tmax_abstime = tcoal_prio_params.timer_coalesce_kt_abstime_max;
+ TCOAL_PRIO_STAT(kt_tcl);
+ } else if (cthread->sched_mode == TH_MODE_FIXED) {
+ *tshift = tcoal_prio_params.timer_coalesce_fp_shift;
+ *tmax_abstime = tcoal_prio_params.timer_coalesce_fp_abstime_max;
+ TCOAL_PRIO_STAT(fp_tcl);
+ } else if (tcoal_qos_adjust(cthread, tshift, tmax_abstime, pratelimited)) {
+ TCOAL_PRIO_STAT(qos_tcl);
+ } else if (cthread->sched_mode == TH_MODE_TIMESHARE) {
+ *tshift = tcoal_prio_params.timer_coalesce_ts_shift;
+ *tmax_abstime = tcoal_prio_params.timer_coalesce_ts_abstime_max;
+ TCOAL_PRIO_STAT(ts_tcl);
+ } else {
+ TCOAL_PRIO_STAT(nc_tcl);
+ }
+ } else if (urgency == TIMER_CALL_SYS_BACKGROUND) {
+ *tshift = tcoal_prio_params.timer_coalesce_bg_shift;
+ *tmax_abstime = tcoal_prio_params.timer_coalesce_bg_abstime_max;
+ TCOAL_PRIO_STAT(bg_tcl);
+ } else {
+ *tshift = tcoal_prio_params.timer_coalesce_kt_shift;
+ *tmax_abstime = tcoal_prio_params.timer_coalesce_kt_abstime_max;
+ TCOAL_PRIO_STAT(kt_tcl);
+ }
+}
+
+
+int timer_user_idle_level;
+
+uint64_t
+timer_call_slop(uint64_t deadline, uint64_t now, uint32_t flags, thread_t cthread, boolean_t *pratelimited)
+{
+ int32_t tcs_shift = 0;
+ uint64_t tcs_max_abstime = 0;
+ uint64_t adjval;
+ uint32_t urgency = (flags & TIMER_CALL_URGENCY_MASK);
+
+ if (mach_timer_coalescing_enabled &&
+ (deadline > now) && (urgency != TIMER_CALL_SYS_CRITICAL)) {
+ timer_compute_leeway(cthread, urgency, &tcs_shift, &tcs_max_abstime, pratelimited);
+
+ if (tcs_shift >= 0) {
+ adjval = MIN((deadline - now) >> tcs_shift, tcs_max_abstime);
+ } else {
+ adjval = MIN((deadline - now) << (-tcs_shift), tcs_max_abstime);
+ }
+ /* Apply adjustments derived from "user idle level" heuristic */
+ adjval += (adjval * timer_user_idle_level) >> 7;
+ return adjval;
+ } else {
+ return 0;
+ }
+}
+
+int
+timer_get_user_idle_level(void)
+{
+ return timer_user_idle_level;
+}
+
+kern_return_t
+timer_set_user_idle_level(int ilevel)
+{
+ boolean_t do_reeval = FALSE;
+
+ if ((ilevel < 0) || (ilevel > 128)) {
+ return KERN_INVALID_ARGUMENT;
+ }
+
+ if (ilevel < timer_user_idle_level) {
+ do_reeval = TRUE;
+ }
+
+ timer_user_idle_level = ilevel;
+
+ if (do_reeval) {
+ ml_timer_evaluate();
+ }
+
+ return KERN_SUCCESS;
+}
projects / apple / xnu.git / blobdiff