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    SubjectRe: [PATCH -v5][RFC]: mutex: implement adaptive spinning
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    On Wed, 2009-01-07 at 15:51 -0700, Peter W. Morreale wrote:
    > 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

    Never mind. Bogus argument.

    That's why we have you Big Guns out there... - To keep us rif-raf in
    line...

    :-)

    Best,
    -PWM



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