linux-kernel - Re: [RFC 2/5] memcg: rework mem_cgroup

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Message-ID: <20121114185245.GF21185@mtj.dyndns.org>
Date:	Wed, 14 Nov 2012 10:52:45 -0800
From:	Tejun Heo <htejun@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Ying Han <yinghan@...gle.com>,
	Glauber Costa <glommer@...allels.com>
Subject: Re: [RFC 2/5] memcg: rework mem_cgroup_iter to use cgroup iterators

Hello, Michal.

On Wed, Nov 14, 2012 at 09:51:29AM +0100, Michal Hocko wrote:
> > 	reclaim(root);
> > 	for_each_descendent_pre()
> > 		reclaim(descendant);
> 
> We cannot do for_each_descendent_pre here because we do not iterate
> through the whole hierarchy all the time. Check shrink_zone.

I'm a bit confused.  Why would that make any difference?  Shouldn't it
be just able to test the condition and continue?

Thanks.

-- 
tejun
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