linux-kernel - Re: [PATCH REPOST RFC cgroup/for-3.7] cgroup: mark subsystems with broken hierarchy support and whine if cgroups are nested for them

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Message-ID: <20120912171120.GP7677@google.com>
Date:	Wed, 12 Sep 2012 10:11:20 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Glauber Costa <glommer@...allels.com>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	Li Zefan <lizefan@...wei.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Turner <pjt@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Thomas Graf <tgraf@...g.ch>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Neil Horman <nhorman@...driver.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH REPOST RFC cgroup/for-3.7] cgroup: mark subsystems with
 broken hierarchy support and whine if cgroups are nested for them

Hello,

On Wed, Sep 12, 2012 at 05:49:07PM +0200, Michal Hocko wrote:
> > While I respect your goal of not warning about any configuration
> > with max_level = 1, I believe the only sane configuration as soon
> > as we get any 2nd-level child is use_hierarchy = 1 for everybody.
> > 
> > Everything aside from it should be warned.
> 
> Defintely. And that what the above guarantess, doesn't it?

I'm getting a bit worried that I might not be fully understanding what
your concern is.  Can you please elaborate what your worries are and
the transition plan that you have in your mind regarding
.use_hierarchy?

Thanks.

-- 
tejun
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