linux-kernel - Re: [patch 06/11] mm: memcg: remove optimization of keeping the root_mem

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Date:	Tue, 13 Sep 2011 19:34:07 +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 06/11] mm: memcg: remove optimization of keeping the
 root_mem_cgroup LRU lists empty

On Mon, 12 Sep 2011 12:57:23 +0200
Johannes Weiner <jweiner@...hat.com> wrote:

> root_mem_cgroup, lacking a configurable limit, was never subject to
> limit reclaim, so the pages charged to it could be kept off its LRU
> lists.  They would be found on the global per-zone LRU lists upon
> physical memory pressure and it made sense to avoid uselessly linking
> them to both lists.
> 
> The global per-zone LRU lists are about to go away on memcg-enabled
> kernels, with all pages being exclusively linked to their respective
> per-memcg LRU lists.  As a result, pages of the root_mem_cgroup must
> also be linked to its LRU lists again.
> 
> The overhead is temporary until the double-LRU scheme is going away
> completely.
> 
> Signed-off-by: Johannes Weiner <jweiner@...hat.com>

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

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