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    SubjectRe: [patch 00/28] Add cmpxchg64_local and cmpxchg_local to each architecture
    * Christoph Lameter ( wrote:
    > On Mon, 27 Aug 2007, Mathieu Desnoyers wrote:
    > > Here is the patch series for 2.6.23-rc3-mm1 that adds cmpxchg_local, and now
    > > also cmpxchg64_local, to each architecture.
    > Any planned uses of cmpxchg64_local?

    Let's say it could possibly eliminate the xtime read seqlock on x86
    (should be investigated) and can be useful to overcome the
    non-synchronized TSC handling when taking TSC-based timestamps. All
    these operations require locking to play with 64 bits values on 32 bits
    architectures, which could be improved by cmpxchg64_local.

    But again, it would require some testing to see if we can improve
    performances there.


    Mathieu Desnoyers
    Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
    OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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      Last update: 2007-08-27 22:29    [W:0.021 / U:35.316 seconds]
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