linux-kernel - Re: [patch] memcg: add memcg sanity checks at allocating and freeing pages

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Date:	Fri, 4 Feb 2011 09:00:08 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] memcg: add memcg sanity checks at allocating and
 freeing pages

On Thu, 3 Feb 2011 15:15:33 +0100
Johannes Weiner <hannes@...xchg.org> wrote:

> From: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
> 
> This patch add checks at allocating or freeing a page whether the page is used
> (iow, charged) from the view point of memcg.
> 
> This check may be useful in debugging a problem and we did similar checks
> before the commit 52d4b9ac(memcg: allocate all page_cgroup at boot).
> 
> This patch adds some overheads at allocating or freeing memory, so it's enabled
> only when CONFIG_DEBUG_VM is enabled.
> 
> Signed-off-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

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


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