linux-kernel - Re: [rfc patch 3/6] mm: memcg-aware global reclaim

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Message-ID: <20110513102858.GO16531@cmpxchg.org>
Date:	Fri, 13 May 2011 12:28:58 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Ying Han <yinghan@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [rfc patch 3/6] mm: memcg-aware global reclaim

On Fri, May 13, 2011 at 11:53:08AM +0200, Michal Hocko wrote:
> On Thu 12-05-11 16:53:55, Johannes Weiner wrote:
> > A page charged to a memcg is linked to a lru list specific to that
> > memcg.  At the same time, traditional global reclaim is obvlivious to
> > memcgs, and all the pages are also linked to a global per-zone list.
> > 
> > This patch changes traditional global reclaim to iterate over all
> > existing memcgs, so that it no longer relies on the global list being
> > present.
> 
> At LSF we have discussed that we should keep a list of over-(soft)limit
> cgroups in a list which would be the first target for reclaiming (in
> round-robin fashion). If we are note able to reclaim enough from those
> (the list becomes empty) we should fallback to the all groups reclaim
> (what you did in this patchset).

This would be on top or instead of 6/6.  This, 3/6, is indepent of
soft limit reclaim.  It is mainly in preparation to remove the global
LRU.
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