From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lennart Poettering <mzxreary-uLTowLwuiw4b1SvskN2V4Q@public.gmane.org>
Subject: Re: [RFD] cgroup: about multiple hierarchies
Date: Mon, 5 Mar 2012 13:43:10 +0100
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To: Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org>
Cc: Kay Sievers <kay.sievers-tD+1rO4QERM@public.gmane.org>, Frederic Weisbecker <fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Michal Schmidt <mschmidt-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>, Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Vivek Goyal <vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

On Thu, 01.03.12 23:04, Mike Galbraith (efault-Mmb7MZpHnFY@public.gmane.org) wrote:

> 
> On Thu, 2012-03-01 at 16:02 -0500, Vivek Goyal wrote: 
> > On Thu, Mar 01, 2012 at 09:26:43PM +0100, Mike Galbraith wrote:
> 
> > > Q: you say systemd requires CONFIG_CGROUPS=y.  Why is that?  It's taking
> > > over sysvinits job afaiui, what does that have to do with cgroups?
> > 
> > I think they were using it to track all the children forked by a service
> > and cleanup all of them if need be. So they just need it for logical
> > grouping functionality and don't require any controllers as such.
> 
> Hm.  Controllers are perhaps not required, but cpu controller was
> configured and used without consent.  I didn't receive an offer.

Just set DefaultControllers= in /etc/systemd/system.conf to an empty
string and systemd will not make use of any hierarchy beyond its private
name=systemd named hierarchy.

Lennart

-- 
Lennart Poettering - Red Hat, Inc.