Specifying cgset -r multiple times fails

[Ken Sharp]

From the man page:

-r <name=value>
              defines name of the file to set and the value which should be written to that file. This parameter can
              be used multiple times.

However:

$ cgset -r cpu.cfs_quota_us=10000 -r cpu.cfs_period_us=50000 gomez
controller cpu can't be add

...it fails.

Seems to work with memory.* for some reason. Checking with cgget confirms that the values have not been set.

This works fine:
$ cgset -r cpu.cfs_period_us=50000 gomez
$ cgset -r cpu.cfs_quota_us=10000 gomez

Also: that error message needs improvement.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: cgroup-bin 0.37.1-1ubuntu10.1
ProcVersionSignature: Ubuntu 3.11.0-15.23~precise1-generic 3.11.10
Uname: Linux 3.11.0-15-generic i686
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: i386
Date: Wed Jan 22 12:49:06 2014
InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release i386 (20120817.3)
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: libcgroup
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.cgconfig.conf: [modified]
mtime.conffile..etc.cgconfig.conf: 2014-01-22T12:10:10.370249

[Ken Sharp (kennybobs)]

$ cgset -r cpu.cfs_quota_us=8000,cpu.cfs_period_us=50000 gomez
cgset: the group can't be modified

So that doesn't work either.

$ cgset -r cpu.cfs_quota_us=8000:cpu.cfs_period_us=50000 gomez
cgset: the group can't be modified

Nor does that.

[Bob (bob53181)]

cgset -r cpu.cfs_quota_us=100000 -r cpu.cfs_period_us=1000 groupname
cgset -r cpu.cfs_period_us=100000 -r cpu.cfs_quota_us=1000 groupname

Both work for me, although the first probably should not. I have libcgroup 0.41-7, probably similar to libcgroup 0.41-6ubuntu1 in
Ubuntu 15.10 Wily Werewolf. Since this is the currently stable version, maybe you should check if it works there and close the bug as fixed.

[Ken Sharp (kennybobs)]

Of course it's not fixed.

[Christian Ehrhardt  (paelzer)]

Working in Xenial, not sure what was the background thou, so I can't point onto what might have to be backported.

cgset there is from cgroup-tools 0.41-7ubuntu1

Confirmed the issue at least on trusty - since I'm not really into the background atm I'm not sure on severity at all - but I at least can confirm the behavior.