linux-kernel - Re: [PATCH 1/4] memcg: account swap cache under lock

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Message-ID: <48E1DDD5.9040304@linux.vnet.ibm.com>
Date:	Tue, 30 Sep 2008 13:35:41 +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>
Subject: Re: [PATCH 1/4] memcg: account swap cache under lock

KAMEZAWA Hiroyuki wrote:
> While page-cache's charge/uncharge is done under page_lock(), swap-cache
> isn't. (anonymous page is charged when it's newly allocated.)
> 
> This patch moves do_swap_page()'s charge() call under lock.
> I don't see any bad problem *now* but this fix will be good for future
> for avoiding unneccesary racy state.
> 
> 
> Changelog: (v5) -> (v6)
>  - mark_page_accessed() is moved before lock_page().
>  - fixed missing unlock_page()
> (no changes in previous version)

Looks good to me

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

-- 
	Balbir
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