From 90d52f65f303091be17b5f4ffab7090b2064b4a1 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Fri, 17 Jul 2020 16:05:47 +0200 Subject: 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 Signed-off-by: Thomas Gleixner Tested-by: Juri Lelli Link: https://lkml.kernel.org/r/20200717140551.29076-9-frederic@kernel.org --- kernel/time/timer.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'kernel/time') diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 76fd9644638b..13f48ee708aa 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -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); } -- cgit v1.2.3-59-g8ed1b