Serge, Thanks a lot, this explains everything. With "dpkg -l | grep cgroup" I found cgroup-lite, which includes /bin/cgroups-mount and /bin/cgroups-umount scripts. After removing this package and rebooting, cat /proc/mounts | grep cgroup show nothing.
I don't know for what is this package intended, and whether it is fully safe to remove it, but I believe I am able to look for it. http://packages.ubuntu.com/search?keywords=cgroup-lite Thanks, Kevin On Fri, Apr 12, 2013 at 7:13 PM, Serge Hallyn <serge.hal...@ubuntu.com> wrote: > Quoting Kevin Wilson (wkev...@gmail.com): >> Hello, >> Thanks a lot for your answer. >> >> I reproduced the problem: >> this is what I run: (after boot, in Ubuntu 12.10) >> >> mount -t tmpfs cgroup_root /cgroup >> >> mkdir /cgroup/test1 >> mount -t cgroup -o cpuset,devices mytest /cgroup/test1 >> >> And I get: >> mount: mytest already mounted or /cgroup/test1 busy >> >> shouldn't it work ? >> >> I tried it on Ubuntu. >> I was surprised to see that some cgroup contolkers are mounted >> under /sys/fs/cgroup (though it seems to me that this should not cause >> a problem). > > It wouldn't cause a problem if you were mounting them separately, > but you are asking for controllers to be bound together, which have > already been separately mounted. That is not possible. > > So for instance > > mkdir /tmp/1 /tmp/2 /tmp/3 > mount -t cgroup -o freezer /tmp/1 > mount -t cgroup -o freezer /tmp/2 > mount -t cgroup -o freezer /tmp/3 > > is ok, but > > mkdir /tmp/1 /tmp/2 /tmp/3 > mount -t cgroup -o freezer /tmp/1 > mount -t cgroup -o cpuset /tmp/2 > mount -t cgroup -o cpuset,freezer /tmp/3 > > is not > >> systemd is not running on Ubuntu, I don't have any idea >> who >> mounted in boot time the /sys/fs/cgroup contollers and for which purpose >> >> mount | grep cgroup >> gives: >> cgroup on /sys/fs/cgroup type tmpfs (rw,relatime,mode=755) >> cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,relatime,cpuset) >> cgroup on /sys/fs/cgroup/cpu type cgroup (rw,relatime,cpu) >> cgroup on /sys/fs/cgroup/cpuacct type cgroup (rw,relatime,cpuacct) >> cgroup on /sys/fs/cgroup/memory type cgroup (rw,relatime,memory) >> cgroup_root on /cgroup type tmpfs (rw) > > look for a cgroup related package, or lines in your fstab: > > dpkg -l | grep cgroup > grep cgroup /etc/fstab > > -serge ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Lxc-users mailing list Lxc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxc-users