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    SubjectRe: [PATCH V2 0/6][RFC] futex: FUTEX_LOCK with optional adaptive spinning
    On Tue, 06 Apr 2010 15:35:31 +0200
    Peter Zijlstra <peterz@infradead.org> wrote:

    > On Tue, 2010-04-06 at 16:28 +0300, Avi Kivity wrote:
    > >
    > > Yes, but that's the best case for spinning. You could simply use a
    > > userspace spinlock in this case.
    >
    > Userspace spinlocks are evil.. they should _never_ be used.

    Thats a gross and inaccurate simplification. For the case Avi is talking
    about spinning in userspace makes sense in a lot of environments. Once
    you've got one thread pinned per cpu (or gang scheduling >-) ) there are
    various environments where it makes complete and utter sense.


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