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    SubjectRe: [PATCH][KVM][retry 3] Add support for Pause Filtering to AMD SVM
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    On Wed, 2009-05-20 at 11:49 +0300, Avi Kivity wrote:
    > Peter Zijlstra wrote:
    > >>> That said, I still thoroughly dislike this whole approach.
    > >>>
    > >>>
    > >> Can you explain why? We have a thread that has detected that it's
    > >> spinning. Keeping on spinning is a waste of cpu time. Why not let
    > >> something else use the cpu?
    > >>
    > >
    > > Because its a polling interface. I much prefer it if we were to get a
    > > wakeup notification when the vcpu holding the lock releases it.
    > >
    >
    > It's a fully virtualized guest. There's no way to get this without
    > patching the guest kernel.

    Yes there is.. virtualized monitor-wait stuff coupled with a
    monitor-wait based spinlock implementation.

    Once we go change silicon, you might as well do it right.


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