linux-kernel - Re: [patch 11/11] mm: memcg: remove unused node/section info from pc->flags

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Message-Id: <20110913195031.5fa2a3c4.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 13 Sep 2011 19:50:31 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Johannes Weiner <jweiner@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <bsingharora@...il.com>,
	Ying Han <yinghan@...gle.com>, Michal Hocko <mhocko@...e.cz>,
	Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 11/11] mm: memcg: remove unused node/section info from
 pc->flags

On Mon, 12 Sep 2011 12:57:28 +0200
Johannes Weiner <jweiner@...hat.com> wrote:

> To find the page corresponding to a certain page_cgroup, the pc->flags
> encoded the node or section ID with the base array to compare the pc
> pointer to.
> 
> Now that the per-memory cgroup LRU lists link page descriptors
> directly, there is no longer any code that knows the page_cgroup but
> not the page.
> 
> Signed-off-by: Johannes Weiner <jweiner@...hat.com>

Ah, ok. remove init code and use zalloc()

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>


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