linux-kernel - Re: [patch 03/11] mm: vmscan: distinguish between memcg triggering reclaim and memcg being scanned

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Message-Id: <20110913192325.9f675d8d.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 13 Sep 2011 19:23:25 +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 03/11] mm: vmscan: distinguish between memcg triggering
 reclaim and memcg being scanned

On Mon, 12 Sep 2011 12:57:20 +0200
Johannes Weiner <jweiner@...hat.com> wrote:

> Memory cgroup hierarchies are currently handled completely outside of
> the traditional reclaim code, which is invoked with a single memory
> cgroup as an argument for the whole call stack.
> 
> Subsequent patches will switch this code to do hierarchical reclaim,
> so there needs to be a distinction between a) the memory cgroup that
> is triggering reclaim due to hitting its limit and b) the memory
> cgroup that is being scanned as a child of a).
> 
> This patch introduces a struct mem_cgroup_zone that contains the
> combination of the memory cgroup and the zone being scanned, which is
> then passed down the stack instead of the zone argument.
> 
> Signed-off-by: Johannes Weiner <jweiner@...hat.com>

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

> 

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