On Mon, 2012-03-05 at 13:43 +0100, Lennart Poettering wrote: 

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

quoted

On Thu, 2012-03-01 at 16:02 -0500, Vivek Goyal wrote: 

quoted

On Thu, Mar 01, 2012 at 09:26:43PM +0100, Mike Galbraith wrote:

quoted

quoted

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.

I updated my laptop to openSUSE 12.1 over the weekend, so tried it.  It
didn't work, so I tried setting JoinControllers= as well.  That split up
cpu and cpuacct, but didn't stop cpu from being used.  I then moved both
system.conf and user.conf to /etc/systemd/save, and got the original
setup back.. not surprising given everything was commented out in both
files to begin with.  The little bugger is stubborn.

maggy:/etc/systemd # mount|grep cgroup
tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,relatime,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/ns type cgroup (rw,nosuid,nodev,noexec,relatime,ns)
cgroup on /sys/fs/cgroup/cpu type cgroup (rw,nosuid,nodev,noexec,relatime,cpu)
cgroup on /sys/fs/cgroup/cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
maggy:/etc/systemd # cat /sys/fs/cgroup/cpu/tasks|wc -l
262
maggy:/etc/systemd # cat system.conf
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
# See systemd.conf(5) for details

[Manager]
#LogLevel=info
#LogTarget=syslog-or-kmsg
#LogColor=yes
#LogLocation=no
#DumpCore=yes
#CrashShell=no
#ShowStatus=yes
#SysVConsole=yes
#CrashChVT=1
#CPUAffinity=1 2
#MountAuto=yes
#SwapAuto=yes
DefaultControllers=
#DefaultStandardOutput=syslog
#DefaultStandardError=inherit
JoinControllers=
maggy:/etc/systemd #

reboot...

maggy:/etc/systemd # mount|grep cgroup
tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,relatime,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/ns type cgroup (rw,nosuid,nodev,noexec,relatime,ns)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
maggy:/etc/systemd # cat /sys/fs/cgroup/cpu/tasks|wc -l
146
maggy:/etc/systemd # ls
save  system  systemd-logind.conf  user
maggy:/etc/systemd #