linux-kernel - Re: [RFC] rework mem

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Message-ID: <20121114184110.GD21185@mtj.dyndns.org>
Date:	Wed, 14 Nov 2012 10:41:10 -0800
From:	Tejun Heo <htejun@...il.com>
To:	Glauber Costa <glommer@...allels.com>
Cc:	Michal Hocko <mhocko@...e.cz>, 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>
Subject: Re: [RFC] rework mem_cgroup iterator

Hello, Glauber.

On Wed, Nov 14, 2012 at 05:17:51PM +0100, Glauber Costa wrote:
> Why can't we reuse the scheduler iterator and move it to kernel/cgroup.c
> ? It already exists, provide sane ordering, and only relies on parent
> information - which cgroup core already have - to do the walk.

Hmmm... we can but I personally much prefer for_each_*() iterators
over callback based ones.  It's just much easier to share states
across an iteration and follow the logic.  walk_tg_tree_from() does
have the benefit of being able to combine pre and post visits in the
same walk, which doesn't seem to have any user at the moment.

Thanks.

-- 
tejun
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