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

[Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>]

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

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.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@jp.fujitsu.com>

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

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