summaryrefslogtreecommitdiffstats
path: root/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'kernel')
-rw-r--r--kernel/kernel/time/hrtimer.c11
-rw-r--r--kernel/kernel/time/tick-sched.c64
2 files changed, 31 insertions, 44 deletions
diff --git a/kernel/kernel/time/hrtimer.c b/kernel/kernel/time/hrtimer.c
index 2c6be169b..5d193396e 100644
--- a/kernel/kernel/time/hrtimer.c
+++ b/kernel/kernel/time/hrtimer.c
@@ -583,6 +583,12 @@ static int hrtimer_reprogram(struct hrtimer *timer,
if (hrtimer_callback_running(timer))
return 0;
+ if (base->cpu_base != cpu_base)
+ return 0;
+
+ if (cpu_base->in_hrtirq)
+ return 0;
+
/*
* CLOCK_REALTIME timer might be requested with an absolute
* expiry time which is less than base->offset. Nothing wrong
@@ -613,12 +619,11 @@ static int hrtimer_reprogram(struct hrtimer *timer,
if (cpu_base->hang_detected)
return 0;
+ cpu_base->expires_next = expires;
/*
* Clockevents returns -ETIME, when the event was in the past.
*/
- res = tick_program_event(expires, 0);
- if (!IS_ERR_VALUE(res))
- cpu_base->expires_next = expires;
+ res = tick_program_event(expires, 1);
return res;
}
diff --git a/kernel/kernel/time/tick-sched.c b/kernel/kernel/time/tick-sched.c
index b3841ba00..f61dbf202 100644
--- a/kernel/kernel/time/tick-sched.c
+++ b/kernel/kernel/time/tick-sched.c
@@ -576,6 +576,20 @@ u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time)
}
EXPORT_SYMBOL_GPL(get_cpu_iowait_time_us);
+static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)
+{
+ hrtimer_cancel(&ts->sched_timer);
+ hrtimer_set_expires(&ts->sched_timer, ts->last_tick);
+
+ /* Forward the time to expire in the future */
+ hrtimer_forward(&ts->sched_timer, now, tick_period);
+
+ if (ts->nohz_mode == NOHZ_MODE_HIGHRES)
+ hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS_PINNED);
+ else
+ tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);
+}
+
static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
ktime_t now, int cpu)
{
@@ -704,22 +718,16 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
goto out;
}
- if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
- hrtimer_start(&ts->sched_timer, expires,
- HRTIMER_MODE_ABS_PINNED);
- /* Check, if the timer was already in the past */
- if (hrtimer_active(&ts->sched_timer))
- goto out;
- } else if (!tick_program_event(expires, 0))
- goto out;
- /*
- * We are past the event already. So we crossed a
- * jiffie boundary. Update jiffies and raise the
- * softirq.
- */
- tick_do_update_jiffies64(ktime_get());
+ if (ts->nohz_mode == NOHZ_MODE_HIGHRES)
+ hrtimer_start(&ts->sched_timer, expires,
+ HRTIMER_MODE_ABS_PINNED);
+ else
+ tick_program_event(expires, 1);
+ } else {
+ /* Tick is stopped, but required now. Enforce it */
+ tick_nohz_restart(ts, now);
+
}
- raise_softirq_irqoff(TIMER_SOFTIRQ);
out:
ts->next_jiffies = next_jiffies;
ts->last_jiffies = last_jiffies;
@@ -880,32 +888,6 @@ ktime_t tick_nohz_get_sleep_length(void)
return ts->sleep_length;
}
-static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)
-{
- hrtimer_cancel(&ts->sched_timer);
- hrtimer_set_expires(&ts->sched_timer, ts->last_tick);
-
- while (1) {
- /* Forward the time to expire in the future */
- hrtimer_forward(&ts->sched_timer, now, tick_period);
-
- if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
- hrtimer_start_expires(&ts->sched_timer,
- HRTIMER_MODE_ABS_PINNED);
- /* Check, if the timer was already in the past */
- if (hrtimer_active(&ts->sched_timer))
- break;
- } else {
- if (!tick_program_event(
- hrtimer_get_expires(&ts->sched_timer), 0))
- break;
- }
- /* Reread time and update jiffies */
- now = ktime_get();
- tick_do_update_jiffies64(now);
- }
-}
-
static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now)
{
/* Update jiffies first */