On Fri, Feb 14, 2014 at 07:15:18PM +0800, Li Zefan wrote:
> > /*
> > +* A root's lifetime is governed by its top cgroup. Zero
> > +* ref indicate that the root is being destroyed. Wait for
> > +* destruction to complete so that the subsystems are fr
于 2014年02月14日 17:36, Li Zefan 写道:
> If we mount the same cgroupfs in serveral mount points, and then
> umount all of them, kill_sb() will be called only once.
>
> Therefore it's wrong to increment top_cgroup's refcnt when we find
> an existing cgroup_root.
>
> Try:
> # mount -t cgroup -o cp
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