linux-kernel - Re: [GIT PULL] kdbus for 4.1-rc1

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Message-ID: <1429289608.3189.47.camel@gmail.com>
Date:	Fri, 17 Apr 2015 18:53:28 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Michal Schmidt <mschmidt@...hat.com>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	Andy Lutomirski <luto@...capital.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tom Gundersen <teg@...m.no>, Jiri Kosina <jkosina@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Daniel Mack <daniel@...que.org>,
	David Herrmann <dh.herrmann@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1

On Wed, 2015-04-15 at 16:48 +0200, Michal Schmidt wrote:
> On 04/15/2015 09:31 AM, Mike Galbraith wrote:
> > it seems [systemd] has now mandated group scheduling.
> 
> What makes you think so? Was it the fact that by default you have a
> populated /sys/fs/cgroup/cpu/ hierarchy? This is either because some
> unit requests the use of the cpu controller using one of the CPU*=
> directives from systemd.resource-control(5), or (perhaps more likely)
> because there is a privileged unit with Delegate=yes. The most likely
> candidate is user@...ervice, and so you could try preventing it from
> starting:
>   systemctl mask user@...ervice

BTW, asking it to symlink it's disabled service to /dev/null, did 
indeed convince it to stop running said disabled service.

> Note that systemd still works without group scheduling or any cgroup
> subsystems enabled in the kernel:
> 
>   $ grep GROUP .config
>   CONFIG_CGROUPS=y

Yup.  CONFIG_CGROUPS=y all by itself isn't useless either, as that 
allows the user to use his box for something other than a doorstop.

Hohum, 'nuff of that ;-)

Thanks for the hint, it seems a tad dainbramaged, but it works.

        -Mike
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