linux-kernel - Re: [PATCH v3 04/13] kmem accounting basic infrastructure

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Message-ID: <20120927175643.GA7777@dhcp22.suse.cz>
Date:	Thu, 27 Sep 2012 19:56:43 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	Glauber Costa <glommer@...allels.com>,
	Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, kamezawa.hiroyu@...fujitsu.com,
	devel@...nvz.org, linux-mm@...ck.org,
	Suleiman Souhlal <suleiman@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v3 04/13] kmem accounting basic infrastructure

On Thu 27-09-12 10:46:05, Tejun Heo wrote:
[...]
> > > The part I nacked is enabling kmemcg on a populated cgroup and then
> > > starting accounting from then without any apparent indication that any
> > > past allocation hasn't been considered.  You end up with numbers which
> > > nobody can't tell what they really mean and there's no mechanism to
> > > guarantee any kind of ordering between populating the cgroup and
> > > configuring it and there's *no* way to find out what happened
> > > afterwards neither.  This is properly crazy and definitely deserves a
> > > nack.
> > > 
> > 
> > Mel suggestion of not allowing this to happen once the cgroup has tasks
> > takes care of this, and is something I thought of myself.
> 
> You mean Michal's?  It should also disallow switching if there are
> children cgroups, right?

Right.
 
-- 
Michal Hocko
SUSE Labs
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