From: "Paul E. McKenney" <[email protected]> The __run_timers() function currently steps through the list one jiffy at a time in order to update the timer wheel. However, if the timer wheel is empty, no adjustment is needed other than updating ->timer_jiffies. Therefore, just before we add a timer to an empty timer wheel, we should mark the timer wheel as being up to date. This marking will reduce (and perhaps eliminate) the jiffy-stepping that a future __run_timers() call will need to do in response to some future timer posting or migration. This commit therefore updates ->timer_jiffies for this case.
Signed-off-by: Paul E. McKenney <[email protected]> --- kernel/timer.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/timer.c b/kernel/timer.c index 2b2e235ea7f1..e539dbf5b9c5 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -745,6 +745,7 @@ __mod_timer(struct timer_list *timer, unsigned long expires, base = lock_timer_base(timer, &flags); + (void)catchup_timer_jiffies(base); ret = detach_if_pending(timer, base, false); if (!ret && pending_only) goto out_unlock; -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
