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    SubjectRe: [PATCH 7/7] KVM: MMU: don't walk every parent pages while mark unsync


    Xiao Guangrong wrote:
    > While we mark the parent's unsync_child_bitmap, if the parent is already
    > unsynced, it no need walk it's parent, it can reduce some unnecessary
    > workload
    >

    Hi Avi, Marcelo,

    About two months ago, i have sent this optimization, it just a little performance
    improved (~0.5%) at that time, now, we allow more page become unsync, this path is
    called higher frequency, during my test, kernelbench show the performance improved
    ~2%, so, i think we may apply it now :-)


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