linux-kernel - Re: [patch 08/11] mm: vmscan: convert global reclaim to per-memcg LRU lists

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Message-Id: <20110913194150.ce66b655.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 13 Sep 2011 19:41:50 +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 08/11] mm: vmscan: convert global reclaim to per-memcg
 LRU lists

On Mon, 12 Sep 2011 12:57:25 +0200
Johannes Weiner <jweiner@...hat.com> wrote:

> The global per-zone LRU lists are about to go away on memcg-enabled
> kernels, global reclaim must be able to find its pages on the
> per-memcg LRU lists.
> 
> Since the LRU pages of a zone are distributed over all existing memory
> cgroups, a scan target for a zone is complete when all memory cgroups
> are scanned for their proportional share of a zone's memory.
> 
> The forced scanning of small scan targets from kswapd is limited to
> zones marked unreclaimable, otherwise kswapd can quickly overreclaim
> by force-scanning the LRU lists of multiple memory cgroups.
> 
> Signed-off-by: Johannes Weiner <jweiner@...hat.com>


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

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