linux-kernel - Re: [patch 7/8] vmscan: memcg-aware unevictable page rescue scanner

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Date:	Thu, 2 Jun 2011 16:27:38 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>
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>, Michal Hocko <mhocko@...e.cz>,
	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>, Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 7/8] vmscan: memcg-aware unevictable page rescue scanner

On Thu, Jun 02, 2011 at 10:27:15PM +0900, Hiroyuki Kamezawa wrote:
> 2011/6/1 Johannes Weiner <hannes@...xchg.org>:
> > Once the per-memcg lru lists are exclusive, the unevictable page
> > rescue scanner can no longer work on the global zone lru lists.
> >
> > This converts it to go through all memcgs and scan their respective
> > unevictable lists instead.
> >
> > Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> 
> Hm, isn't it better to have only one GLOBAL LRU for unevictable pages ?
> memcg only needs counter for unevictable pages and LRU is not necessary
> to be per memcg because we don't reclaim it...

That's true, and I will look into it.  But keep in mind that it needs
special-casing that one list type from all the others, so maybe it's
just easier to keep it like this.

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