linux-kernel - Re: [PATCH v3 01/13] memcg: Make it possible to use the stock for more than one page.

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Message-ID: <20121001184812.GB23734@cmpxchg.org>
Date:	Mon, 1 Oct 2012 14:48:12 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com, devel@...nvz.org,
	Tejun Heo <tj@...nel.org>, linux-mm@...ck.org,
	Suleiman Souhlal <suleiman@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v3 01/13] memcg: Make it possible to use the stock for
 more than one page.

On Tue, Sep 18, 2012 at 06:03:58PM +0400, Glauber Costa wrote:
> From: Suleiman Souhlal <ssouhlal@...eBSD.org>
> 
> We currently have a percpu stock cache scheme that charges one page at a
> time from memcg->res, the user counter. When the kernel memory
> controller comes into play, we'll need to charge more than that.
> 
> This is because kernel memory allocations will also draw from the user
> counter, and can be bigger than a single page, as it is the case with
> the stack (usually 2 pages) or some higher order slabs.
> 
> [ glommer@...allels.com: added a changelog ]
> 
> Signed-off-by: Suleiman Souhlal <suleiman@...gle.com>
> Signed-off-by: Glauber Costa <glommer@...allels.com>
> Acked-by: David Rientjes <rientjes@...gle.com>
> Acked-by: Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Acked-by: Michal Hocko <mhocko@...e.cz>

Independent of how the per-subtree enable-through-setting-limit
discussion pans out, we're going to need the charge cache, so:

Acked-by: Johannes Weiner <hannes@...xchg.org>
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