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    SubjectRe: [patch] voluntary-preempt-
    Ingo Molnar wrote :
    > * Ingo Molnar <> wrote:
    > > > Yes, Ingo identified an issue with copy_page_range, I don't think it's
    > > > fixed yet. See the voluntary-preempt- thread.
    > >
    > > right, it's not fixed yet. It's not a trivial critical section - we
    > > are holding two locks and are mapping two atomic kmaps.
    > fortunately it's easier than i thought - neither the source pmd nor the
    > target pmd can go away so we can simply drop the locks, reschedule, and
    > remap. Does the patch below (ontop of -P3) fix the copy_page_range()
    > latencies you are seeing?
    > Ingo

    Ooops, sorry about my previous post, I had missed this one. It fixes the
    problem, thanks.


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