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    SubjectRe: [PATCHSET] mempool, percpu, blkcg: fix percpu stat allocation and remove stats_lock
    Hello, Andrew.

    On Thu, Feb 23, 2012 at 03:22:23PM -0800, Andrew Morton wrote:
    > I forget how those patches work, but they might be vulnerable to the
    > same issue. If the block layer can handle the failed allocation
    > attempt and retry at the next I/O event then I guess that would be
    > acceptable; we'd lose a bit of statistical info occasionally, but who
    > cares.
    > But ISTR that we can't handle allocation failures here?

    It's just gonna skip percpu stats. The problem with percpu mempool is
    more about what __GFP_WAIT means in the interface. Handling alloc
    failure isn't difficult at all.



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