/*
- * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2019 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <kern/ledger.h>
#include <machine/machparam.h>
#include <kern/machine.h>
+#include <kern/policy_internal.h>
+#include <kern/sched_clutch.h>
#ifdef CONFIG_MACH_APPROXIMATE_TIME
#include <machine/commpage.h> /* for commpage_update_mach_approximate_time */
#include <kern/monotonic.h>
#endif /* MONOTONIC */
-static void sched_update_thread_bucket(thread_t thread);
-
/*
* thread_quantum_expire:
*
*/
if ((thread->sched_mode == TH_MODE_REALTIME || thread->sched_mode == TH_MODE_FIXED) &&
!(thread->sched_flags & TH_SFLAG_PROMOTED) &&
+ !(thread->kern_promotion_schedpri != 0) &&
!(thread->sched_flags & TH_SFLAG_PROMOTE_REASON_MASK) &&
!(thread->options & TH_OPT_SYSTEM_CRITICAL)) {
uint64_t new_computation;
}
int old_base_pri = thread->base_pri;
+ thread->req_base_pri = priority;
+ if (thread->sched_flags & TH_SFLAG_BASE_PRI_FROZEN) {
+ priority = MAX(priority, old_base_pri);
+ }
thread->base_pri = priority;
if ((thread->state & TH_RUN) == TH_RUN) {
machine_switch_perfcontrol_state_update(PERFCONTROL_ATTR_UPDATE,
ctime, PERFCONTROL_CALLOUT_WAKE_UNSAFE, thread);
}
- sched_update_thread_bucket(thread);
+#if !CONFIG_SCHED_CLUTCH
+ /* For the clutch scheduler, this operation is done in set_sched_pri() */
+ SCHED(update_thread_bucket)(thread);
+#endif /* !CONFIG_SCHED_CLUTCH */
thread_recompute_sched_pri(thread, SETPRI_DEFAULT);
}
+/*
+ * sched_set_kernel_thread_priority:
+ *
+ * Set the absolute base priority of the thread
+ * and reset its scheduled priority.
+ *
+ * Called with the thread unlocked.
+ */
+void
+sched_set_kernel_thread_priority(thread_t thread, int new_priority)
+{
+ spl_t s = splsched();
+
+ thread_lock(thread);
+
+ assert(thread->sched_mode != TH_MODE_REALTIME);
+ assert(thread->effective_policy.thep_qos == THREAD_QOS_UNSPECIFIED);
+
+ if (new_priority > thread->max_priority) {
+ new_priority = thread->max_priority;
+ }
+#if CONFIG_EMBEDDED
+ if (new_priority < MAXPRI_THROTTLE) {
+ new_priority = MAXPRI_THROTTLE;
+ }
+#endif /* CONFIG_EMBEDDED */
+
+ thread->importance = new_priority - thread->task_priority;
+
+ sched_set_thread_base_priority(thread, new_priority);
+
+ thread_unlock(thread);
+ splx(s);
+}
+
/*
* thread_recompute_sched_pri:
*
priority = DEPRESSPRI;
}
+ if (thread->kern_promotion_schedpri > 0) {
+ priority = MAX(priority, thread->kern_promotion_schedpri);
+
+ if (sched_mode != TH_MODE_REALTIME) {
+ priority = MIN(priority, MAXPRI_PROMOTE);
+ }
+ }
+
if (sched_flags & TH_SFLAG_PROMOTED) {
priority = MAX(priority, thread->promotion_priority);
thread->cpu_delta += delta;
+#if CONFIG_SCHED_CLUTCH
+ /*
+ * Update the CPU usage for the thread group to which the thread belongs.
+ * The implementation assumes that the thread ran for the entire delta
+ * as part of the same thread group.
+ */
+ sched_clutch_cpu_usage_update(thread, delta);
+#endif /* CONFIG_SCHED_CLUTCH */
+
priority = sched_compute_timeshare_priority(thread);
if (priority != thread->sched_pri) {
* is usage = (usage >> shift1) +/- (usage >> abs(shift2)) where the
* +/- is determined by the sign of shift 2.
*/
-struct shift_data {
- int shift1;
- int shift2;
-};
-#define SCHED_DECAY_TICKS 32
-static struct shift_data sched_decay_shifts[SCHED_DECAY_TICKS] = {
- {1, 1}, {1, 3}, {1, -3}, {2, -7}, {3, 5}, {3, -5}, {4, -8}, {5, 7},
- {5, -7}, {6, -10}, {7, 10}, {7, -9}, {8, -11}, {9, 12}, {9, -11}, {10, -13},
- {11, 14}, {11, -13}, {12, -15}, {13, 17}, {13, -15}, {14, -17}, {15, 19}, {16, 18},
- {16, -19}, {17, 22}, {18, 20}, {18, -20}, {19, 26}, {20, 22}, {20, -22}, {21, -27}
+const struct shift_data sched_decay_shifts[SCHED_DECAY_TICKS] = {
+ { .shift1 = 1, .shift2 = 1 },
+ { .shift1 = 1, .shift2 = 3 },
+ { .shift1 = 1, .shift2 = -3 },
+ { .shift1 = 2, .shift2 = -7 },
+ { .shift1 = 3, .shift2 = 5 },
+ { .shift1 = 3, .shift2 = -5 },
+ { .shift1 = 4, .shift2 = -8 },
+ { .shift1 = 5, .shift2 = 7 },
+ { .shift1 = 5, .shift2 = -7 },
+ { .shift1 = 6, .shift2 = -10 },
+ { .shift1 = 7, .shift2 = 10 },
+ { .shift1 = 7, .shift2 = -9 },
+ { .shift1 = 8, .shift2 = -11 },
+ { .shift1 = 9, .shift2 = 12 },
+ { .shift1 = 9, .shift2 = -11 },
+ { .shift1 = 10, .shift2 = -13 },
+ { .shift1 = 11, .shift2 = 14 },
+ { .shift1 = 11, .shift2 = -13 },
+ { .shift1 = 12, .shift2 = -15 },
+ { .shift1 = 13, .shift2 = 17 },
+ { .shift1 = 13, .shift2 = -15 },
+ { .shift1 = 14, .shift2 = -17 },
+ { .shift1 = 15, .shift2 = 19 },
+ { .shift1 = 16, .shift2 = 18 },
+ { .shift1 = 16, .shift2 = -19 },
+ { .shift1 = 17, .shift2 = 22 },
+ { .shift1 = 18, .shift2 = 20 },
+ { .shift1 = 18, .shift2 = -20 },
+ { .shift1 = 19, .shift2 = 26 },
+ { .shift1 = 20, .shift2 = 22 },
+ { .shift1 = 20, .shift2 = -22 },
+ { .shift1 = 21, .shift2 = -27 }
};
/*
*/
extern int sched_pri_decay_band_limit;
-#ifdef CONFIG_EMBEDDED
+
+/* Only use the decay floor logic on embedded non-clutch schedulers */
+#if CONFIG_EMBEDDED && !CONFIG_SCHED_CLUTCH
int
sched_compute_timeshare_priority(thread_t thread)
return priority;
}
-#else /* CONFIG_EMBEDDED */
+#else /* CONFIG_EMBEDDED && !CONFIG_SCHED_CLUTCH */
int
sched_compute_timeshare_priority(thread_t thread)
return priority;
}
-#endif /* CONFIG_EMBEDDED */
+#endif /* CONFIG_EMBEDDED && !CONFIG_SCHED_CLUTCH */
/*
* can_update_priority
thread->cpu_usage += delta + thread->cpu_delta;
thread->cpu_delta = 0;
- struct shift_data *shiftp = &sched_decay_shifts[ticks];
+#if CONFIG_SCHED_CLUTCH
+ /*
+ * Update the CPU usage for the thread group to which the thread belongs.
+ * The implementation assumes that the thread ran for the entire delta
+ * as part of the same thread group.
+ */
+ sched_clutch_cpu_usage_update(thread, delta);
+#endif /* CONFIG_SCHED_CLUTCH */
+
+ const struct shift_data *shiftp = &sched_decay_shifts[ticks];
if (shiftp->shift2 > 0) {
thread->cpu_usage = (thread->cpu_usage >> shiftp->shift1) +
* values. The updated pri_shift would be used to calculate the
* new priority of the thread.
*/
+#if CONFIG_SCHED_CLUTCH
+ thread->pri_shift = sched_clutch_thread_pri_shift(thread, thread->th_sched_bucket);
+#else /* CONFIG_SCHED_CLUTCH */
thread->pri_shift = sched_pri_shifts[thread->th_sched_bucket];
+#endif /* CONFIG_SCHED_CLUTCH */
/* Recompute scheduled priority if appropriate. */
if (thread->sched_mode == TH_MODE_TIMESHARE) {
/*
* TH_BUCKET_RUN is a count of *all* runnable non-idle threads.
* Each other bucket is a count of the runnable non-idle threads
- * with that property.
+ * with that property. All updates to these counts should be
+ * performed with os_atomic_* operations.
+ *
+ * For the clutch scheduler, this global bucket is used only for
+ * keeping the total global run count.
*/
-volatile uint32_t sched_run_buckets[TH_BUCKET_MAX];
+uint32_t sched_run_buckets[TH_BUCKET_MAX];
static void
sched_incr_bucket(sched_bucket_t bucket)
assert(bucket >= TH_BUCKET_FIXPRI &&
bucket <= TH_BUCKET_SHARE_BG);
- hw_atomic_add(&sched_run_buckets[bucket], 1);
+ os_atomic_inc(&sched_run_buckets[bucket], relaxed);
}
static void
assert(bucket >= TH_BUCKET_FIXPRI &&
bucket <= TH_BUCKET_SHARE_BG);
- assert(sched_run_buckets[bucket] > 0);
+ assert(os_atomic_load(&sched_run_buckets[bucket], relaxed) > 0);
- hw_atomic_sub(&sched_run_buckets[bucket], 1);
+ os_atomic_dec(&sched_run_buckets[bucket], relaxed);
}
-/* TH_RUN & !TH_IDLE controls whether a thread has a run count */
-
uint32_t
sched_run_incr(thread_t thread)
{
assert((thread->state & (TH_RUN | TH_IDLE)) == TH_RUN);
- uint32_t new_count = hw_atomic_add(&sched_run_buckets[TH_BUCKET_RUN], 1);
+ uint32_t new_count = os_atomic_inc(&sched_run_buckets[TH_BUCKET_RUN], relaxed);
sched_incr_bucket(thread->th_sched_bucket);
sched_decr_bucket(thread->th_sched_bucket);
- uint32_t new_count = hw_atomic_sub(&sched_run_buckets[TH_BUCKET_RUN], 1);
+ uint32_t new_count = os_atomic_dec(&sched_run_buckets[TH_BUCKET_RUN], relaxed);
return new_count;
}
-static void
+void
sched_update_thread_bucket(thread_t thread)
{
sched_bucket_t old_bucket = thread->th_sched_bucket;
thread->sched_mode = new_mode;
- sched_update_thread_bucket(thread);
+ SCHED(update_thread_bucket)(thread);
}
/*
}
}
-/*
- * Promote thread to a specific priority
- *
- * Promotion must not last past syscall boundary
- * Clients must always pair promote and unpromote 1:1
- *
- * Called at splsched with thread locked
- */
-void
-sched_thread_promote_to_pri(thread_t thread,
- int priority,
- __kdebug_only uintptr_t trace_obj /* already unslid */)
-{
- assert((thread->sched_flags & TH_SFLAG_PROMOTED) != TH_SFLAG_PROMOTED);
- assert(thread->promotion_priority == 0);
- assert(priority <= MAXPRI_PROMOTE);
- assert(priority > 0);
-
- KDBG(MACHDBG_CODE(DBG_MACH_SCHED, MACH_PROMOTED),
- thread_tid(thread), trace_obj, priority);
-
- thread->sched_flags |= TH_SFLAG_PROMOTED;
- thread->promotion_priority = priority;
-
- thread_recompute_sched_pri(thread, SETPRI_DEFAULT);
-}
-
-
-/*
- * Update a pre-existing priority promotion to have a higher priority floor
- * Priority can only go up from the previous value
- * Update must occur while a promotion is active
- *
- * Called at splsched with thread locked
- */
-void
-sched_thread_update_promotion_to_pri(thread_t thread,
- int priority,
- __kdebug_only uintptr_t trace_obj /* already unslid */)
-{
- assert(thread->promotions > 0);
- assert((thread->sched_flags & TH_SFLAG_PROMOTED) == TH_SFLAG_PROMOTED);
- assert(thread->promotion_priority > 0);
- assert(priority <= MAXPRI_PROMOTE);
-
- if (thread->promotion_priority < priority) {
- KDBG(MACHDBG_CODE(DBG_MACH_SCHED, MACH_PROMOTED_UPDATE),
- thread_tid(thread), trace_obj, priority);
-
- thread->promotion_priority = priority;
- thread_recompute_sched_pri(thread, SETPRI_DEFAULT);
- }
-}
-
-/*
- * End a priority promotion
- * Demotes a thread back to its expected priority without the promotion in place
- *
- * Called at splsched with thread locked
- */
-void
-sched_thread_unpromote(thread_t thread,
- __kdebug_only uintptr_t trace_obj /* already unslid */)
-{
- assert((thread->sched_flags & TH_SFLAG_PROMOTED) == TH_SFLAG_PROMOTED);
- assert(thread->promotion_priority > 0);
-
- KDBG(MACHDBG_CODE(DBG_MACH_SCHED, MACH_UNPROMOTED),
- thread_tid(thread), trace_obj, 0);
-
- thread->sched_flags &= ~TH_SFLAG_PROMOTED;
- thread->promotion_priority = 0;
-
- thread_recompute_sched_pri(thread, SETPRI_DEFAULT);
-}
-
-/* called with thread locked */
-void
-assert_promotions_invariant(thread_t thread)
-{
- if (thread->promotions > 0) {
- assert((thread->sched_flags & TH_SFLAG_PROMOTED) == TH_SFLAG_PROMOTED);
- }
-
- if (thread->promotions == 0) {
- assert((thread->sched_flags & TH_SFLAG_PROMOTED) != TH_SFLAG_PROMOTED);
- }
-}
-
/*
* Promote thread to have a sched pri floor for a specific reason
*
projects / apple / xnu.git / blobdiff