[PATCH] tick/nohz: Make the idle_exittime update correctly
From: Yunfeng Ye
Date: Tue Dec 15 2020 - 07:07:58 EST
The idle_exittime field of tick_sched is used to record the time when
the idle state was left. but currently the idle_exittime is updated in
the function tick_nohz_restart_sched_tick(), which is not always in idle
state when nohz_full is configured.
tick_irq_exit
tick_nohz_irq_exit
tick_nohz_full_update_tick
tick_nohz_restart_sched_tick
ts->idle_exittime = now;
So move to tick_nohz_stop_idle() to make the idle_exittime update
correctly.
Signed-off-by: Yunfeng Ye <yeyunfeng@xxxxxxxxxx>
---
kernel/time/tick-sched.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 749ec2a583de..be2e5d772d50 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -591,6 +591,7 @@ static void tick_nohz_stop_idle(struct tick_sched *ts, ktime_t now)
{
update_ts_time_stats(smp_processor_id(), ts, now, NULL);
ts->idle_active = 0;
+ ts->idle_exittime = now;
sched_clock_idle_wakeup_event();
}
@@ -901,7 +902,6 @@ static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now)
* Cancel the scheduled timer and restore the tick
*/
ts->tick_stopped = 0;
- ts->idle_exittime = now;
tick_nohz_restart(ts, now);
}
--
2.18.4