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Date: Wed, 25 Jul 2012 22:15:12 +0400
From: Glauber Costa <glommer@parallels.com>
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To: Christoph Lameter <cl@linux.com>
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        Pekka Enberg <penberg@cs.helsinki.fi>, Michal Hocko <mhocko@suse.cz>,
        Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH v4 24/25] memcg/slub: shrink dead caches
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On 07/25/2012 07:23 PM, Christoph Lameter wrote:
> On Fri, 20 Jul 2012, Glauber Costa wrote:
> 
>>> This is the same btw in SLAB which keeps objects in per cpu caches and
>>> keeps empty slab pages on special queues.
>>>
>>>> This patch marks all memcg caches as dead. kmem_cache_shrink is called
>>>> for the ones who are not yet dead - this will force internal cache
>>>> reorganization, and then all references to empty pages will be removed.
>>>
>>> You need to call this also for slab to drain the caches and free the pages
>>> on the empty list.
>>>
>> Doesn't the SLAB have a time-based reaper for that?
> 
> Yes but it will take a couple of minutes to drain the caches.
> 
You might have seen in my last submission that included this in the slab
as well.