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Date: Fri, 21 Sep 2012 13:52:36 -0700
From: Tejun Heo <tj@kernel.org>
To: Glauber Costa <glommer@parallels.com>
Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
        kamezawa.hiroyu@jp.fujitsu.com, devel@openvz.org, linux-mm@kvack.org,
        Suleiman Souhlal <suleiman@google.com>,
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        Pekka Enberg <penberg@cs.helsinki.fi>, Michal Hocko <mhocko@suse.cz>,
        Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH v3 06/16] memcg: infrastructure to match an allocation
 to the right cache
Message-ID: <20120921205236.GT7264@google.com>
References: <1347977530-29755-1-git-send-email-glommer@parallels.com>
 <1347977530-29755-7-git-send-email-glommer@parallels.com>
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Missed some stuff.

On Tue, Sep 18, 2012 at 06:12:00PM +0400, Glauber Costa wrote:
> +static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
> +						  struct kmem_cache *cachep)
> +{
...
> +	memcg->slabs[idx] = new_cachep;
...
> +struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep,
> +					  gfp_t gfp)
> +{
...
> +	return memcg->slabs[idx];

I think you need memory barriers for the above pair.

Thanks.

-- 
tejun