linux-kernel - Re: [PATCH v4 17/25] skip memcg kmem allocations in specified code regions

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Message-ID: <4FDF1CE5.90803@jp.fujitsu.com>
Date:	Mon, 18 Jun 2012 21:19:49 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Glauber Costa <glommer@...allels.com>
CC:	linux-mm@...ck.org, Pekka Enberg <penberg@...nel.org>,
	Cristoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>, cgroups@...r.kernel.org,
	devel@...nvz.org, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v4 17/25] skip memcg kmem allocations in specified code
 regions

(2012/06/18 19:28), Glauber Costa wrote:
> This patch creates a mechanism that skip memcg allocations during
> certain pieces of our core code. It basically works in the same way
> as preempt_disable()/preempt_enable(): By marking a region under
> which all allocations will be accounted to the root memcg.
> 
> We need this to prevent races in early cache creation, when we
> allocate data using caches that are not necessarily created already.
> 
> Signed-off-by: Glauber Costa<glommer@...allels.com>
> CC: Christoph Lameter<cl@...ux.com>
> CC: Pekka Enberg<penberg@...helsinki.fi>
> CC: Michal Hocko<mhocko@...e.cz>
> CC: Kamezawa Hiroyuki<kamezawa.hiroyu@...fujitsu.com>
> CC: Johannes Weiner<hannes@...xchg.org>
> CC: Suleiman Souhlal<suleiman@...gle.com>

I'm ok with this approach.

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>


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