linux-kernel - Re: [RFD] cgroup: about multiple hierarchies

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Date:	Tue, 13 Mar 2012 09:02:18 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Lennart Poettering <lennart@...ttering.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Michal Schmidt <mschmidt@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFD] cgroup: about multiple hierarchies

Hello,

On Tue, Mar 13, 2012 at 09:49:22AM -0400, Vivek Goyal wrote:
> So everything will be under single hierarchy? How will we control that
> what controllers are active on what cgroups? Or all controllers are going
> to be active on all cgroups on that hierarchy. 
> 
> That would be bad for IO cgroups where a better way to use it to isolate
> the trouble making workload and run rest in root or a common cgroup.

Depending on active configs, I guess, or maybe we'll have active
controllers mask which can also be used for single-level restriction
for controllers which don't support full hierarchy.

Thanks.

-- 
tejun
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