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    SubjectRe: [PATCH -v5][RFC]: mutex: implement adaptive spinning
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    On Wed, 2009-01-07 at 23:33 +0100, Ingo Molnar wrote:
    > * Gregory Haskins <ghaskins@novell.com> wrote:
    >
    > > Can I ask a simple question in light of all this discussion?
    > >
    > > "Is get_task_struct() really that bad?"
    >
    > it dirties a cacheline and it also involves atomics.
    >
    > Also, it's a small design cleanliness issue to me: get_task_struct()
    > impacts the lifetime of an object - and if a locking primitive has
    > side-effects on object lifetimes that's never nice.
    >

    True, but it's for one iteration * NR_CPUS, max.

    Best,
    -PWM


    > Ingo
    >



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