On Thu, Mar 10, 2011 at 9:07 AM, Eric B Munson <emunson@xxxxxxxxx> wrote: > The cgroup documentation does not specify how a process can be removed from a > particular group. This patch adds a note at the end of the simple example > about how this is done. Also, some cgroups (like cpusets) require user input > before a new group can be used. This is noted in the patch as well. > > Signed-off-by: Eric B Munson <emunson@xxxxxxxxx> Acked-by: Paul Menage <menage@xxxxxxxxxx> > --- > Changes from V1: > Rework the note about removing a process from a cgroup > Add note about ns cgroup causing failure when moving processes between groups > > Documentation/cgroups/cgroups.txt | 12 ++++++++++++ > 1 files changed, 12 insertions(+), 0 deletions(-) > > diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt > index 44b8b7a..cbdfb7d 100644 > --- a/Documentation/cgroups/cgroups.txt > +++ b/Documentation/cgroups/cgroups.txt > @@ -349,6 +349,10 @@ To mount a cgroup hierarchy with all available subsystems, type: > The "xxx" is not interpreted by the cgroup code, but will appear in > /proc/mounts so may be any useful identifying string that you like. > > +Note: Some subsystems do not work without some user input first. For instance, > +if cpusets are enabled the user will have to populate the cpus and mems files > +for each new cgroup created before that group can be used. > + > To mount a cgroup hierarchy with just the cpuset and memory > subsystems, type: > # mount -t cgroup -o cpuset,memory hier1 /dev/cgroup > @@ -426,6 +430,14 @@ You can attach the current shell task by echoing 0: > > # echo 0 > tasks > > +Note: Since every task is always a member of exactly one cgroup in each > +mounted hierarchy, to remove a task from its current cgroup you must > +move it into a new cgroup (possibly the root cgroup) by writing to the > +new cgroup's tasks file. > + > +Note: If the ns cgroup is active, moving a process to another cgroup can > +fail. > + > 2.3 Mounting hierarchies by name > -------------------------------- > > -- > 1.7.1 > > _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
