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

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Message-ID: <20110513110226.GG25304@tiehlicka.suse.cz>
Date:	Fri, 13 May 2011 13:02:27 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Johannes Weiner <hannes@...xchg.org>
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 13-05-11 12:28:58, Johannes Weiner wrote:
> 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.

OK.

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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