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    SubjectRe: [RFC][PATCH 1/3] CGroups: Add a per-subsystem hierarchy_mutex
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    On Wed, Dec 10, 2008 at 10:29 PM, Balbir Singh
    <balbir@linux.vnet.ibm.com> wrote:
    >
    > Seems reasonable, I was wondering if instead of acquiring a mutex per
    > subsystem that shares the root, if we can collapse it to a single
    > mutex and prevent cgroup from changing binding. Those are
    > optimizations that we can think of later

    You mean a single hierarchy_mutex per root? But given that one of the
    things being protected is which root you're attached to, if you're
    trying to prevent hierarchy changes then which root's hierarchy_mutex
    would you lock?

    Paul


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