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    SubjectRe: [PATCH] sched: fix another race when reading /proc/sched_debug
    Paul Menage wrote:
    > I sent out some patches last week (search for hierarchy_mutex) that would
    > mean that you'd only need to take a subsystem-local lock to keep a cgroup
    > alive. People seemed to like them so I'll tweak them based on feedback and
    > send them on to Andrew.
    >

    Unfortunately, AFAICS the proposed hierarchy_mutex can't solve this bug. :(

    > Paul
    >
    > On Dec 14, 2008 4:48 AM, "Peter Zijlstra" <a.p.zijlstra@chello.nl> wrote:
    >
    > On Sun, 2008-12-14 at 10:54 +0800, Li Zefan wrote: > > i merged it up in
    > tip/master, could you pleas...
    > Can't we detect a dead task-group and skip those instead of adding this
    > global lock?
    >
    >> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> > --- > kernel/sched_fair.c
    > | 6 ++++++ > kerne...
    >



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