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tick/nohz: Set the correct expiry when switching to nohz/lowres mode

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commit 0ff53d0964 sets the next tick interrupt to the last jiffies update,
i.e. in the past, because the forward operation is invoked before the set
operation. There is no resulting damage (yet), but we get an extra pointless
tick interrupt.

Revert the order so we get the next tick interrupt in the future.

Fixes: commit 0ff53d0964 "tick: sched: Force tick interrupt and get rid of softirq magic"
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1453893967-3458-1-git-send-email-wanpeng.li@hotmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Wanpeng Li 2016-01-27 19:26:07 +08:00 committed by Thomas Gleixner
parent d7023e62c5
commit 1ca8ec532f
1 changed files with 2 additions and 2 deletions
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4
kernel/time/tick-sched.c
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@ -995,9 +995,9 @@ static void tick_nohz_switch_to_nohz(void)
/* Get the next period */
next = tick_init_jiffy_update();
hrtimer_forward_now(&ts->sched_timer, tick_period);
hrtimer_set_expires(&ts->sched_timer, next);
tick_program_event(next, 1);
hrtimer_forward_now(&ts->sched_timer, tick_period);
tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);
tick_nohz_activate(ts, NOHZ_MODE_LOWRES);
}