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    SubjectRe: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb_mm
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    On 15 May 2012 20:00, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
    > On Tue, 2012-05-15 at 19:52 +1000, Nick Piggin wrote:
    >>
    >> It could be warranted to change tlb_flush_mmu to a range API to
    >> avoid doing the per-entry tracking which those architectures do?
    >
    > The per-entry could result in a much smaller range, there's no point in
    > flushing tlbs for unpopulated pages.

    Well common case for small ranges hopefully would be quite dense
    I think. It could be not worth the extra work (although maybe it would
    be).

    >
    > Anyway, I don't think even think we'd need to change the API for that,
    > you could track the entire range through tlb_start_vma() if you wanted
    > (although nobody does that IIRC).

    I'm not sure if you can do that very well, because the tlb might have to
    be flushed part way through a vma when we fill up the gather, so you
    don't want to flush the full range each time.


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