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    SubjectRe: frequent lockups in 3.18rc4
    On Fri, Nov 21, 2014 at 11:46 AM, Linus Torvalds
    <torvalds@linux-foundation.org> wrote:
    > On Fri, Nov 21, 2014 at 11:34 AM, Linus Torvalds
    > <torvalds@linux-foundation.org> wrote:
    >>
    >> So I kind of agree, but it wouldn't be my primary worry. My primary
    >> worry is actually paravirt doing something insane.
    >
    > Btw, on that tangent, does anybody actually care about paravirt any more?
    >

    Amazon, for better or for worse.

    > I'd love to start moving away from it. It makes a lot of the low-level
    > code completely impossible to follow due to the random indirection
    > through "native" vs "paravirt op table". Not just the page table
    > handling, it's all over.
    >
    > Anybody who seriously does virtualization uses hw virtualization that
    > is much better than it used to be. And the non-serious users aren't
    > that performance-sensitive by definition.
    >
    > I note that the Fedora kernel config seems to include paravirt by
    > default, so you get a lot of the crazy overheads..

    I think that there is a move toward deprecating Xen PV in favor of
    PVH, but we're not there yet.

    --Andy


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