Quoting Arie Skliarouk (sklia...@gmail.com):
> I don't have the /cgroup directory mounted. Somehow, the directory is
> mounted automatically onto the /sys/fs/cgroup
>
> *root@mf:~# df | grep cgroup
> cgroup 12368328 0 12368328 0% /sys/fs/cgroup
> root@mf:~# ls /sys/fs/cgroup/
> blkio cpu cpuacct cpuset devices freezer memory net_cls perf_event*
>
> Each subdirectory of the above contains directory per container with knobs
> that are specific to the resource:
>
> *root@mf:~# ls /sys/fs/cgroup/cpu/dev
> cgroup.clone_children cgroup.procs cpu.rt_runtime_us
> notify_on_release
> cgroup.event_control cpu.rt_period_us cpu.shares tasks
> root@mf:~#*
>
> Could well be this is because of the 3.0.0-12-server kernel. I don't see
No, userspace does the mounting. i.e. in ubuntu the cgroup-lite or
cgroup-bin packages both do it.
> how I can rename a stuck cgroup easily in this situation. Any advices?
You can build an lxc with my patch (until Daniel has a chance to apply it),
but in the meantime you can make a script 'move_cgroup.sh' along the lines
of:
#!/bin/sh
if [ $# -lt 1 ]; then
echo "Usage: $0 <cgroup-name>"
echo " Moves the <cgroup-name> out of the way."
fi
g=$1
t=`mktemp -u cg.XXXXXXXX`
for d in /sys/fs/cgroup/*; do
mv $d/$g $d/$g.$t
done
Note that doesn't clean anything up, so if there are hung tasks those will
still be around. A script to list details of each task in the hung cgroup
would be pretty simple too, and useful - if you write one, you might send
it here for inclusion in lxc!
> BTW, I once had /cgroup mounted from fstab like this:
>
> *none /cgroup cgroup defaults 0 0*
>
> It grouped all settings into per-container directory nicely, but the server
> failed to boot with that.
Yes, once early userspace has mounted the /sys/fs/cgroup/*, that fstab
entry would cause trouble. But if you remove the package doing the
cgroup mounting, you should be able to go back to using this fstab
entry.
-serge
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