Commit 42594970 authored by Ingo Molnar's avatar Ingo Molnar

Merge branch 'nohz/drop-double-write-v3' of...

Merge branch 'nohz/drop-double-write-v3' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into timers/core

Pull nohz fixes from Frederic Weisbecker:

	" The tick reschedules itself unconditionally. It's relevant in periodic
	  mode but not in dynticks mode where it results in spurious double clock
	  writes and even spurious periodic behaviour for low-res case.

	  This set fixes that:

	  * 1st patch removes low-res periodic tick rescheduling in nohz mode.
	    This fixes spurious periodic behaviour.

	  * 2nd patch does the same for high-res mode. Here there is no such
	    spurious periodic behaviour but it still spares a double clock write
	    in some cases. "
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parents 52addcf9 2a16fc93
......@@ -968,6 +968,10 @@ static void tick_nohz_handler(struct clock_event_device *dev)
tick_sched_do_timer(now);
tick_sched_handle(ts, regs);
/* No need to reprogram if we are running tickless */
if (unlikely(ts->tick_stopped))
return;
while (tick_nohz_reprogram(ts, now)) {
now = ktime_get();
tick_do_update_jiffies64(now);
......@@ -1095,6 +1099,10 @@ static enum hrtimer_restart tick_sched_timer(struct hrtimer *timer)
if (regs)
tick_sched_handle(ts, regs);
/* No need to reprogram if we are in idle or full dynticks mode */
if (unlikely(ts->tick_stopped))
return HRTIMER_NORESTART;
hrtimer_forward(timer, now, tick_period);
return HRTIMER_RESTART;
......
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