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

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Message-ID: <20120305124310.GD10929@tango.0pointer.de>
Date:	Mon, 5 Mar 2012 13:43:10 +0100
From:	Lennart Poettering <mzxreary@...inter.de>
To:	Mike Galbraith <efault@....de>
Cc:	Vivek Goyal <vgoyal@...hat.com>,
	Michal Schmidt <mschmidt@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>, 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>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFD] cgroup: about multiple hierarchies

On Thu, 01.03.12 23:04, Mike Galbraith (efault@....de) 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.
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