Commit 78b43536 authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Pekka Enberg
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slab: use deferable timers for its periodic housekeeping

slab has a "once every 2 second" timer for its housekeeping.
As the number of logical processors is growing, its more and more
common that this 2 second timer becomes the primary wakeup source.

This patch turns this housekeeping timer into a deferable timer,
which means that the timer does not interrupt idle, but just runs
at the next event that wakes the cpu up.

The impact is that the timer likely runs a bit later, but during the
delay no code is running so there's not all that much reason for
a difference in housekeeping to occur because of this delay.

Signed-off-by: default avatarArjan van de Ven <>
Signed-off-by: default avatarPekka Enberg <>
parent 1c5474a6
......@@ -861,7 +861,7 @@ static void __cpuinit start_cpu_timer(int cpu)
if (keventd_up() && reap_work->work.func == NULL) {
INIT_DELAYED_WORK(reap_work, cache_reap);
INIT_DELAYED_WORK_DEFERRABLE(reap_work, cache_reap);
schedule_delayed_work_on(cpu, reap_work,
__round_jiffies_relative(HZ, cpu));
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