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    SubjectRe: [PATCH] use unfair spinlock when running on hypervisor.
    > Collecting the contention/usage statistics on a per spinlock
    > basis seems complex. I believe a practical approximation
    > to this are adaptive mutexes where upon hitting a spin
    > time threshold, punt and let the scheduler reconcile fairness.

    That would probably work, except: how do you get the
    adaptive spinlock into a paravirt op without slowing
    down a standard kernel?

    -- -- Speaking for myself only.

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