linux-kernel - Re: [PATCH 3/5] memcg: use ID instead of pointer in page

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Message-Id: <20100831111448.259e2d8c.nishimura@mxp.nes.nec.co.jp>
Date:	Tue, 31 Aug 2010 11:14:48 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	gthelen@...gle.com, m-ikeda@...jp.nec.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"menage@...gle.com" <menage@...gle.com>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH 3/5] memcg: use ID instead of pointer in page_cgroup

On Wed, 25 Aug 2010 17:09:00 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> Now, addresses of memory cgroup can be calculated by their ID without complex.
> This patch relplaces pc->mem_cgroup from a pointer to a unsigned short.
> On 64bit architecture, this offers us more 6bytes room per page_cgroup.
> Use 2bytes for blkio-cgroup's page tracking. More 4bytes will be used for
> some light-weight concurrent access.
> 
> We may able to move this id onto flags field but ...go step by step.
> 
> Changelog: 20100824
>  - fixed comments, and typo.
> Changelog: 20100811
>  - using new rcu APIs, as rcu_dereference_check() etc.
> Changelog: 20100804
>  - added comments to page_cgroup.h
> Changelog: 20100730
>  - fixed some garbage added by debug code in early stage
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Reviewed-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
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