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: <20120912164102.GM7677@google.com>
Date:	Wed, 12 Sep 2012 09:41:02 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	Li Zefan <lizefan@...wei.com>,
	Glauber Costa <glommer@...allels.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 05:47:45PM +0200, Michal Hocko wrote:
> > If it's absolutely necessary, I think it should be a root-only flag
> > (even if that ends up using the same code path).  Eventually, we
> > really want to kill .use_hierarchy, or at least make it to RO 1.  As
> > it's currently defined, it's just way too confusing.
> 
> Agreed on that, definitely.

The thing is that if we're gonna be headed that way, we're gonna have
to nudge people to .use_hierarchy = 1 everywher first.  If
.use_hierarchy = 0 at root is a valid use case which absolutedly needs
to be maintained (from what I read, I don't think it is), let's move
it to a different root-only flag; otherwise, it should be phased out.
As such, while the user might not be necessarily wrong, we still need
to unify the behavior, I think.

Thanks.

-- 
tejun
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