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    SubjectRe: [PATCH -v9][RFC] mutex: implement adaptive spinning

    * Linus Torvalds <> wrote:

    > On Tue, 13 Jan 2009, Peter Zijlstra wrote:
    > >
    > > Ok, tested only 1, but that was the one I remember lockups from -- and
    > > that seems to be good with the cmpxchg.
    > >
    > > Do you fancy me sending v10 or will you make that change locally?
    > I'd like to get this in, but I'm not going to apply it in any case
    > without way more testing.
    > It missed the merge window, but I'm potentially willing to let it slip
    > in - but only if there are a fair number of people willing to do numbers
    > and some harsh testing. Preferably people who did see problems earlier,
    > ie at a minimum Chris and Ingo under the loads they used before and saw
    > issues with.

    I am tracking Peter's code in tip/core/locking:

    c10b491: mutex: implement adaptive spinning, v8
    c356a7c: mutex: implement adaptive spinning, v7
    b89e5d8: mutex: implement adaptive spinning, v6
    237ac94: mutex: implement adaptive spinning

    And v8 is rock solid in all my testing - and i'll give v10 a similar
    workout as well.

    Would you prefer a single commit or is this kind of delta development
    history useful, with all the variants (at least the later, more promising
    ones) included?

    The commits are in a tight group with no merges inbetween.


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