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    SubjectRe: [PATCH] cgroup: fix dentry still in use bug when dropping css refs after umount
    Hello, Li.

    On Wed, Jul 04, 2012 at 02:19:15PM +0800, Li Zefan wrote:
    > > I think we're horridly broken for
    > > root cgroup tho - and it has been broken for very long time. I think
    > > it's mostly hidden because most (all?) controllers short-circuit root
    > > cgroup. Eh, well....
    > >
    > Could you elaborate a bit on what's broken for root cgroup?

    If someone holds css ref of a root cgroup, AFAICS nothing is
    preventing the cgroup hierarchy from being unmounted and root cgroup



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