linux-kernel - Re: [patch 02/11] mm: vmscan: distinguish global reclaim from global LRU scanning

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Message-Id: <20110913190749.c56d3f90.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 13 Sep 2011 19:07:49 +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 02/11] mm: vmscan: distinguish global reclaim from
 global LRU scanning

On Mon, 12 Sep 2011 12:57:19 +0200
Johannes Weiner <jweiner@...hat.com> wrote:

> The traditional zone reclaim code is scanning the per-zone LRU lists
> during direct reclaim and kswapd, and the per-zone per-memory cgroup
> LRU lists when reclaiming on behalf of a memory cgroup limit.
> 
> Subsequent patches will convert the traditional reclaim code to
> reclaim exclusively from the per-memory cgroup LRU lists.  As a
> result, using the predicate for which LRU list is scanned will no
> longer be appropriate to tell global reclaim from limit reclaim.
> 
> This patch adds a global_reclaim() predicate to tell direct/kswapd
> reclaim from memory cgroup limit reclaim and substitutes it in all
> places where currently scanning_global_lru() is used for that.
> 
> Signed-off-by: Johannes Weiner <jweiner@...hat.com>

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

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