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authorWanpeng Li <kernellwp@gmail.com>2016-01-27 19:26:07 +0800
committerThomas Gleixner <tglx@linutronix.de>2016-01-27 12:45:57 +0100
commit1ca8ec532fc2d986f1f4a319857bb18e0c9739b4 (patch)
parentd7023e62c5128bf9f150d792a3ea8c758cb431a3 (diff)
tick/nohz: Set the correct expiry when switching to nohz/lowres mode
commit 0ff53d096422 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 0ff53d096422 "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>
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index cbe5d8dcf15a..de2d9fef6ea6 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -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);