The following commit has been merged into the timers/core branch of tip:
Commit-ID: 90d52f65f303091be17b5f4ffab7090b2064b4a1
Gitweb: https://git.kernel.org/tip/90d52f65f303091be17b5f4ffab7090b2064b4a1
Author: Frederic Weisbecker <frederic@xxxxxxxxxx>
AuthorDate: Fri, 17 Jul 2020 16:05:47 +02:00
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Fri, 17 Jul 2020 21:55:23 +02:00
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@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Juri Lelli <juri.lelli@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20200717140551.29076-9-frederic@xxxxxxxxxx
---
kernel/time/timer.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 76fd964..13f48ee 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);
}
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