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Date: Fri, 02 Mar 2012 11:51:43 +0100
From: Michal Schmidt <mschmidt@redhat.com>
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To: Mike Galbraith <efault@gmx.de>
CC: Vivek Goyal <vgoyal@redhat.com>, Peter Zijlstra <peterz@infradead.org>,
        Tejun Heo <tj@kernel.org>, Li Zefan <lizf@cn.fujitsu.com>,
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        Lennart Poettering <lennart@poettering.net>,
        Frederic Weisbecker <fweisbec@gmail.com>, linux-kernel@vger.kernel.org,
        Christoph Hellwig <hch@infradead.org>
Subject: Re: [RFD] cgroup: about multiple hierarchies
References: <20120221211938.GE12236@google.com>  <20120222163858.GB4128@redhat.com> <20120222165714.GC4128@redhat.com>  <1329990094.24994.64.camel@twins> <1330006399.11248.20.camel@twins>  <4F4FAF89.3090706@redhat.com> <1330633603.7414.49.camel@marge.simpson.net>  <20120301210213.GF13533@redhat.com> <1330639448.7414.97.camel@marge.simpson.net>
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On 03/01/2012 11:04 PM, Mike Galbraith wrote:
> Hm.  Controllers are perhaps not required, but cpu controller was
> configured and used without consent.  I didn't receive an offer.

This is optional.

"DefaultControllers=" in /etc/systemd/system.conf