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

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Date:	Wed, 15 Apr 2015 16:48:27 +0200
From:	Michal Schmidt <mschmidt@...hat.com>
To:	Mike Galbraith <umgwanakikbuti@...il.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 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

Note that systemd still works without group scheduling or any cgroup
subsystems enabled in the kernel:

  $ grep GROUP .config
  CONFIG_CGROUPS=y
  # CONFIG_CGROUP_DEBUG is not set
  # CONFIG_CGROUP_FREEZER is not set
  # CONFIG_CGROUP_DEVICE is not set
  # CONFIG_CGROUP_CPUACCT is not set
  # CONFIG_CGROUP_HUGETLB is not set
  # CONFIG_CGROUP_PERF is not set
  # CONFIG_CGROUP_SCHED is not set
  # CONFIG_BLK_CGROUP is not set
  # CONFIG_SCHED_AUTOGROUP is not set
  # CONFIG_NETFILTER_XT_MATCH_CGROUP is not set
  # CONFIG_NETFILTER_XT_MATCH_DEVGROUP is not set
  # CONFIG_NET_CLS_CGROUP is not set
  # CONFIG_CGROUP_NET_PRIO is not set
  # CONFIG_CGROUP_NET_CLASSID is not set

Michal
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