linux-kernel - Re: [PATCH 10/10] memcg/sl[au]b: shrink dead caches

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Message-ID: <50103802.1070700@parallels.com>
Date:	Wed, 25 Jul 2012 22:16:34 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Greg Thelen <gthelen@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>, <devel@...nvz.org>,
	<cgroups@...r.kernel.org>, Pekka Enberg <penberg@...helsinki.fi>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH 10/10] memcg/sl[au]b: shrink dead caches

On 07/25/2012 09:13 PM, Christoph Lameter wrote:
> On Wed, 25 Jul 2012, Glauber Costa wrote:
> 
>> In the slub allocator, when the last object of a page goes away, we
>> don't necessarily free it - there is not necessarily a test for empty
>> page in any slab_free path.
> 
> That is true for the slab allocator as well. In either case calling
> kmem_cache_shrink() will make the objects go away by draining the cached
> objects and freeing the pages used for the objects back to the page
> allocator. You do not need this patch. Just call the proper functions to
> drop the objecgts in the caches in either allocator.
> 
>> The slab allocator has a time based reaper that would eventually get rid
>> of the objects, but we can also call it explicitly, since dead caches
>> are not a likely event.
> 
> So this is already for both allocators?
> 
Yes, I just didn't updated the whole changelog. my bad.

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