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    SubjectRe: [PATCH -v5][RFC]: mutex: implement adaptive spinning


    On Wed, 7 Jan 2009, Steven Rostedt wrote:
    >
    > What would be interesting is various benchmarks against all three.
    >
    > 1) no mutex spinning.
    > 2) get_task_struct() implementation.
    > 3) spin_or_sched implementation.

    One of the issues is that I cannot convince myself that (2) is even
    necessarily correct. At least not without having all cases happen inder
    the mutex spinlock - which they don't. Even with the original patch, the
    uncontended cases set and cleared the owner field outside the lock.

    Linus


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