linux-kernel - Re: [PATCHv3 8/8] cgroup: Add documentation for cgroup namespaces

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Message-ID: <20150107224430.GA28414@htj.dyndns.org>
Date:	Wed, 7 Jan 2015 17:45:11 -0500
From:	Tejun Heo <tj@...nel.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	Richard Weinberger <richard@....at>,
	Linux API <linux-api@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	cgroups mailinglist <cgroups@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCHv3 8/8] cgroup: Add documentation for cgroup namespaces

On Wed, Jan 07, 2015 at 04:14:40PM -0600, Eric W. Biederman wrote:
> I see what you mean.  If it is indeed the case than a mount of cgroupfs
> using the unified hiearchy and can not specify which controllers are
> present under that mount that very significant bug and presents a very
> significant regression in user space flexibility.

The parent always controls which controllers are made available at the
children level.  Only if the parent enables a controller, its
children, whether they're namespaces or not, can choose to further
distribute resources using that controller.  It's a straight-forward
top-down thing.

-- 
tejun
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