linux-kernel - Re: [PATCH 2/5] memcg: more use of css ID in memcg.

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Message-Id: <20100901165238.5086e67d.nishimura@mxp.nes.nec.co.jp>
Date:	Wed, 1 Sep 2010 16:52:38 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	gthelen@...gle.com, Munehiro Ikeda <m-ikeda@...jp.nec.com>,
	menage@...gle.com, "lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH 2/5] memcg: more use of css ID in memcg.

On Wed, 1 Sep 2010 15:42:59 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> Now, memory cgroup has an ID per cgroup and make use of it at
>  - hierarchy walk,
>  - swap recording.
> 
> This patch is for making more use of it. The final purpose is
> to replace page_cgroup->mem_cgroup's pointer to an unsigned short.
> 
> This patch caches a pointer of memcg in an array. By this, we
> don't have to call css_lookup() which requires radix-hash walk.
> This saves some amount of memory footprint at lookup memcg via id.
> 
> Changelog: 20100901
>  - added unregster_memcg_id() and did some clean up.
>  - removed ->valid.
>  - fixed mem_cgroup_num counter handling.
> 
> Changelog: 20100825
>  - applied comments.
> 
> Changelog: 20100811
>  - adjusted onto mmotm-2010-08-11
>  - fixed RCU related parts.
>  - use attach_id() callback.
> 
> Changelog: 20100804
>  - fixed description in init/Kconfig
> 
> Changelog: 20100730
>  - fixed rcu_read_unlock() placement.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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