linux-kernel - Re: [PATCH v5 04/14] kmem accounting basic infrastructure

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Date:	Thu, 18 Oct 2012 12:47:27 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	kamezawa.hiroyu@...fujitsu.com, Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>, devel@...nvz.org,
	linux-kernel@...r.kernel.org, Li Zefan <lizefan@...wei.com>
Subject: Re: [PATCH v5 04/14] kmem accounting basic infrastructure

Hey, Glauber.

On Thu, Oct 18, 2012 at 09:01:23PM +0400, Glauber Costa wrote:
> That is the offensive part. But it is also how things are done in memcg
> right now, and there is nothing fundamentally different in this one.
> Whatever lands in the remaining offenders, can land in here.

I think the problem here is that we don't have "you're committing to
creation of a new cgroup" callback and thus subsystem can't
synchronize locally against cgroup creation.  For task migration
->attach() does that but cgroup creation may fail after ->create()
succeeded so that doesn't work.

We'll probably need to add ->post_create() which is invoked after
creation is complete.  Li?

Thanks.

-- 
tejun
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