linux-kernel - Re: [PATCH v5 14/18] memcg/sl[au]b: shrink dead caches

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Message-ID: <0000013a7a9144d1-de184c46-2a7d-4e6c-8606-927cc1f48969-000000@email.amazonses.com>
Date:	Fri, 19 Oct 2012 19:47:51 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Glauber Costa <glommer@...allels.com>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	kamezawa.hiroyu@...fujitsu.com,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>, devel@...nvz.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH v5 14/18] memcg/sl[au]b: shrink dead caches

On Fri, 19 Oct 2012, Glauber Costa wrote:

> An unlikely branch is used to make sure this case does not affect
> performance in the usual slab_free path.
>
> 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.

This is also something that could be done from slab_common since all
allocators have kmem_cache_shrink and kmem_cache_shrink can be used to
drain the caches and free up empty slab pages.

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