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slab: shut down cache_reaper when cpu goes down 

Shutdown the cache_reaper if the cpu is brought down and set the
cache_reap.func to NULL.  Otherwise hotplug shuts down the reaper for good.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-05-09 02:34:22 -07:00 committed by Linus Torvalds
parent a4798833d2
commit 5830c59021
1 changed files with 14 additions and 0 deletions
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14
mm/slab.c
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@ -1279,6 +1279,20 @@ static int __cpuinit cpuup_callback(struct notifier_block *nfb,
start_cpu_timer(cpu);
break;
#ifdef CONFIG_HOTPLUG_CPU
case CPU_DOWN_PREPARE:
/*
* Shutdown cache reaper. Note that the cache_chain_mutex is
* held so that if cache_reap() is invoked it cannot do
* anything expensive but will only modify reap_work
* and reschedule the timer.
*/
cancel_rearming_delayed_work(&per_cpu(reap_work, cpu));
/* Now the cache_reaper is guaranteed to be not running. */
per_cpu(reap_work, cpu).work.func = NULL;
break;
case CPU_DOWN_FAILED:
start_cpu_timer(cpu);
break;
case CPU_DEAD:
/*
* Even if all the cpus of a node are down, we don't free the