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    SubjectRe: [patch v2 0/5] percpu_counter: bug fix and enhancement
    On Wed, 11 May 2011, Tejun Heo wrote:

    > Hey, Shaohua.
    > On Wed, May 11, 2011 at 04:10:12PM +0800, Shaohua Li wrote:
    > > The new implementation uses lglock to protect percpu data. Each cpu has its
    > > private lock while other cpu doesn't take. In this way _add doesn't need take
    > > global lock anymore and remove the deviation. This still gives me about
    > > about 5x ~ 6x faster (not that faster than the original 7x faster, but still
    > > good) with the workload mentioned in patch 4.
    > I'm afraid I'm not too thrilled about lglock + atomic64 usage. It is
    > a very patchy approach which addresses a very specific use case which
    > might just need a higher @batch. I just can't see enough benefits to
    > justify the overhead and complexity. :-(

    Same here.

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