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Diffstat (limited to 'kernel/time/hrtimer.c')
-rw-r--r--kernel/time/hrtimer.c87
1 files changed, 14 insertions, 73 deletions
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index bf7fc4989e5c..e7c2392666cb 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -49,7 +49,6 @@
#include <linux/sched/deadline.h>
#include <linux/timer.h>
#include <linux/freezer.h>
-#include <linux/delay.h>
#include <asm/uaccess.h>
@@ -782,34 +781,6 @@ void hrtimers_resume(void)
clock_was_set_delayed();
}
-static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer)
-{
-#ifdef CONFIG_TIMER_STATS
- if (timer->start_site)
- return;
- timer->start_site = __builtin_return_address(0);
- memcpy(timer->start_comm, current->comm, TASK_COMM_LEN);
- timer->start_pid = current->pid;
-#endif
-}
-
-static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer)
-{
-#ifdef CONFIG_TIMER_STATS
- timer->start_site = NULL;
-#endif
-}
-
-static inline void timer_stats_account_hrtimer(struct hrtimer *timer)
-{
-#ifdef CONFIG_TIMER_STATS
- if (likely(!timer_stats_active))
- return;
- timer_stats_update_stats(timer, timer->start_pid, timer->start_site,
- timer->function, timer->start_comm, 0);
-#endif
-}
-
/*
* Counterpart to lock_hrtimer_base above:
*/
@@ -953,7 +924,6 @@ remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base, bool rest
* rare case and less expensive than a smp call.
*/
debug_deactivate(timer);
- timer_stats_hrtimer_clear_start_info(timer);
reprogram = base->cpu_base == this_cpu_ptr(&hrtimer_bases);
if (!restart)
@@ -1012,8 +982,6 @@ void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
/* Switch the timer base, if necessary: */
new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);
- timer_stats_hrtimer_set_start_info(timer);
-
/* Update pinned state */
timer->state &= ~HRTIMER_STATE_PINNED;
timer->state |= (!!(mode & HRTIMER_MODE_PINNED)) << HRTIMER_PINNED_SHIFT;
@@ -1154,12 +1122,6 @@ static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
base = hrtimer_clockid_to_base(clock_id);
timer->base = &cpu_base->clock_base[base];
timerqueue_init(&timer->node);
-
-#ifdef CONFIG_TIMER_STATS
- timer->start_site = NULL;
- timer->start_pid = -1;
- memset(timer->start_comm, 0, TASK_COMM_LEN);
-#endif
}
/**
@@ -1243,7 +1205,6 @@ static void __run_hrtimer(struct hrtimer_cpu_base *cpu_base,
raw_write_seqcount_barrier(&cpu_base->seq);
__remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE, 0);
- timer_stats_account_hrtimer(timer);
fn = timer->function;
/*
@@ -1631,42 +1592,22 @@ static void init_hrtimers_cpu(int cpu)
}
#if defined(CONFIG_HOTPLUG_CPU)
-static void migrate_hrtimer_list(struct hrtimer_cpu_base *old_base,
- struct hrtimer_cpu_base *new_base,
- unsigned int i,
- bool wait,
+static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
+ struct hrtimer_clock_base *new_base,
bool remove_pinned)
{
struct hrtimer *timer;
struct timerqueue_node *node;
struct timerqueue_head pinned;
int is_pinned;
- struct hrtimer_clock_base *old_c_base = &old_base->clock_base[i];
- struct hrtimer_clock_base *new_c_base = &new_base->clock_base[i];
+ bool is_hotplug = !cpu_online(old_base->cpu_base->cpu);
timerqueue_init_head(&pinned);
- while ((node = timerqueue_getnext(&old_c_base->active))) {
+ while ((node = timerqueue_getnext(&old_base->active))) {
timer = container_of(node, struct hrtimer, node);
- if (wait) {
- /* Ensure timers are done running before continuing */
- while (hrtimer_callback_running(timer)) {
- raw_spin_unlock(&old_base->lock);
- raw_spin_unlock(&new_base->lock);
- cpu_relax();
- /*
- * cpu_relax may just be a barrier. Grant the
- * run_hrtimer_list code some time to obtain the
- * spinlock.
- */
- udelay(2);
- raw_spin_lock(&new_base->lock);
- raw_spin_lock_nested(&old_base->lock,
- SINGLE_DEPTH_NESTING);
- }
- } else {
+ if (is_hotplug)
BUG_ON(hrtimer_callback_running(timer));
- }
debug_deactivate(timer);
/*
@@ -1674,7 +1615,7 @@ static void migrate_hrtimer_list(struct hrtimer_cpu_base *old_base,
* timer could be seen as !active and just vanish away
* under us on another CPU
*/
- __remove_hrtimer(timer, old_c_base, HRTIMER_STATE_ENQUEUED, 0);
+ __remove_hrtimer(timer, old_base, HRTIMER_STATE_ENQUEUED, 0);
is_pinned = timer->state & HRTIMER_STATE_PINNED;
if (!remove_pinned && is_pinned) {
@@ -1682,7 +1623,7 @@ static void migrate_hrtimer_list(struct hrtimer_cpu_base *old_base,
continue;
}
- timer->base = new_c_base;
+ timer->base = new_base;
/*
* Enqueue the timers on the new cpu. This does not
* reprogram the event device in case the timer
@@ -1691,7 +1632,7 @@ static void migrate_hrtimer_list(struct hrtimer_cpu_base *old_base,
* sort out already expired timers and reprogram the
* event device.
*/
- enqueue_hrtimer(timer, new_c_base);
+ enqueue_hrtimer(timer, new_base);
}
/* Re-queue pinned timers for non-hotplug usecase */
@@ -1699,11 +1640,11 @@ static void migrate_hrtimer_list(struct hrtimer_cpu_base *old_base,
timer = container_of(node, struct hrtimer, node);
timerqueue_del(&pinned, &timer->node);
- enqueue_hrtimer(timer, old_c_base);
+ enqueue_hrtimer(timer, old_base);
}
}
-static void __migrate_hrtimers(int scpu, bool wait, bool remove_pinned)
+static void __migrate_hrtimers(int scpu, bool remove_pinned)
{
struct hrtimer_cpu_base *old_base, *new_base;
unsigned long flags;
@@ -1720,8 +1661,8 @@ static void __migrate_hrtimers(int scpu, bool wait, bool remove_pinned)
raw_spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
- migrate_hrtimer_list(old_base, new_base, i, wait,
- remove_pinned);
+ migrate_hrtimer_list(&old_base->clock_base[i],
+ &new_base->clock_base[i], remove_pinned);
}
raw_spin_unlock(&old_base->lock);
@@ -1737,12 +1678,12 @@ static void migrate_hrtimers(int scpu)
BUG_ON(cpu_online(scpu));
tick_cancel_sched_timer(scpu);
- __migrate_hrtimers(scpu, false, true);
+ __migrate_hrtimers(scpu, true);
}
void hrtimer_quiesce_cpu(void *cpup)
{
- __migrate_hrtimers(*(int *)cpup, true, false);
+ __migrate_hrtimers(*(int *)cpup, false);
}
#endif /* CONFIG_HOTPLUG_CPU */
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-23 16:01:02 +0000