On Mon, 29 Jan 2007, Oleg Nesterov wrote:
> > The slab would need a notification
> > that the workqueue for a processor was shutdown in order to set work.func
> > = NULL.
>
> The slab has a notification: CPU_XXX events. It should cancel a pending per
> cpu "reap_work timer".
Ahh. Okay then the following patch would fix it?
Shutdown cache_reaper when cpu goes down
Shutdown the cache_reaper in slab.c 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 <[email protected]>
Index: linux-2.6.20-rc6/mm/slab.c
===================================================================
--- linux-2.6.20-rc6.orig/mm/slab.c 2007-01-24 20:19:28.000000000 -0600
+++ linux-2.6.20-rc6/mm/slab.c 2007-01-29 13:08:05.773928988 -0600
@@ -1269,6 +1269,10 @@ static int __cpuinit cpuup_callback(stru
break;
#ifdef CONFIG_HOTPLUG_CPU
case CPU_DOWN_PREPARE:
+ /* Shutdown cache reaper */
+ cancel_rearming_delayed_work(&per_cpu(reap_work, cpu));
+ per_cpu(reap_work, cpu).work.func = NULL;
+
mutex_lock(&cache_chain_mutex);
break;
case CPU_DOWN_FAILED:
-
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