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    SubjectRe: [PATCHSET] mempool, percpu, blkcg: fix percpu stat allocation and remove stats_lock
    On Thu, Mar 08, 2012 at 10:08:33AM -0800, Tejun Heo wrote:
    > It's probably from something forgetting to put cgroup and pre_destroy
    > waiting for it. Such bugs would have been masked before but now show
    > up as stalls during rmdir. I'm not too happy with how cgroup is
    > handling cgroup file additions and removals and hoping to implement
    > proper 'sever' semantics similar to that of sysfs. In the longer
    > term, such behavior should go away but for now we'll just have to hunt
    > down the actual bug to avoid stalls (which we have to do anyway but
    > it's more visible now).

    Hmm... I'll probably need it for dynamic file additions and removals
    for dynamic policy updates && the blkcg changes are scheduled for
    3.5-rc1 window (not 3.4-rc1), so we should have enough time to resolve



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