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timers: Reuse next expiry cache after nohz exit 

Now that the next expiry it tracked unconditionally when a timer is added,
this information can be reused on a tick firing after exiting nohz.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juri Lelli <juri.lelli@redhat.com>
Link: https://lkml.kernel.org/r/20200717140551.29076-9-frederic@kernel.org
This commit is contained in:
Frederic Weisbecker 2020-07-17 16:05:47 +02:00 committed by Thomas Gleixner
parent dc2a0f1fb2
commit 90d52f65f3
1 changed files with 2 additions and 4 deletions
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6
kernel/time/timer.c
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@ -1706,13 +1706,11 @@ static int collect_expired_timers(struct timer_base *base,
* the next expiring timer.
*/
if ((long)(now - base->clk) > 2) {
unsigned long next = __next_timer_interrupt(base);
/*
* If the next timer is ahead of time forward to current
* jiffies, otherwise forward to the next expiry time:
*/
if (time_after(next, now)) {
if (time_after(base->next_expiry, now)) {
/*
* The call site will increment base->clk and then
* terminate the expiry loop immediately.
@ -1720,7 +1718,7 @@ static int collect_expired_timers(struct timer_base *base,
base->clk = now;
return 0;
}
base->clk = next;
base->clk = base->next_expiry;
}
return __collect_expired_timers(base, heads);
}