linux-kernel - Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

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Date:	Wed, 17 Nov 2010 23:52:17 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Lennart Poettering <mzxreary@...inter.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Mike Galbraith <efault@....de>,
	Vivek Goyal <vgoyal@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

On Wed, 2010-11-17 at 23:45 +0100, Lennart Poettering wrote:
> On Wed, 17.11.10 23:37, Peter Zijlstra (a.p.zijlstra@...llo.nl) wrote:
> 
> > 
> > On Wed, 2010-11-17 at 23:34 +0100, Lennart Poettering wrote:
> > > 
> > > This should fix things for people with systemd and GNOME. Yes, all
> > > others are left in the cold. Sorry for that. 
> > 
> > Is there an easy opt out for that, other than booting a CONFIG_CGROUP=n
> > kernel?
> 
> systemd relies on CONFIG_CGROUP=y, since it useses it for service
> management. It creates its own name=systemd hierarchy for that with no
> controllers attached. If you turn that off, then systemd will refuse to
> boot.

Do expect distro bugzilla entries when this 'awesome'-ness hits the
street.

>  However, it does not rely on any of the controllers, and hence you
> are welcome to disable all cgroup controlls and systemd won't complain.
> 
> If you want to disable the automatic creation of groups in the 'cpu'
> hierarchy for user sessions then you can tell pam_systemd that by passing
> "controllers=" on the PAM config line. ("controllers=cpu" is the implied
> default.)
> 
> There's currently no global option to disable the same logic in systemd
> when it creates 'cpu' cgroups for the various services it runs. However,
> you can disable that individually with "ControlGroups=cpu:/" in the
> .service files. I will now add a global option as well.

A global knob is a must -- preferably with neon signs on so I can find
it.  Luckily I don't use this GNOME junk, otherwise I'd have had to ask
how to revert that crap as well.


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