linux-kernel - Re: [PATCH 2/4] memcg: set page->mapping NULL before uncharge

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Message-ID: <48E2F389.40101@linux.vnet.ibm.com>
Date:	Wed, 01 Oct 2008 09:20:33 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/4] memcg: set page->mapping NULL before uncharge

KAMEZAWA Hiroyuki wrote:
> This patch tries to make page->mapping to be NULL before
> mem_cgroup_uncharge_cache_page() is called.
> 
> "page->mapping == NULL" is a good check for "whether the page is still
> radix-tree or not".
> This patch also adds BUG_ON() to mem_cgroup_uncharge_cache_page();
> 
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Looks good to me

Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>

-- 
	Balbir
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