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    SubjectRe: [RFC][PATCH] CGroups: Add a per-subsystem hierarchy lock


    Paul Menage wrote:
    > On Tue, Jul 1, 2008 at 8:55 PM, Max Krasnyansky <maxk@qualcomm.com> wrote:
    >> I was about to say "yeah, looks good" and then tried a couple of
    >> different hot-plug scenarious.
    >> We still have circular locking even with your patch
    >>
    >
    > What sequence of actions do you do? I've not been able to reproduce a
    > lockdep failure.

    mkdir /dev/cpuset
    mount -t cgroup -o cpuset cpuset /dev/cpuset
    mkdir /dev/cpuset/0
    mkdir /dev/cpuset/1
    echo 0-2 > /dev/cpuset/0/cpuset.cpus
    echo 3 > /dev/cpuset/1/cpuset.cpus
    echo 0 > /dev/cpuset/cpuset.sched_load_balance
    echo 0 > /sys/devices/system/cpu/cpu3/online

    I just tried it again and got exact same lockdep output that I sent before.

    Max



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