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    SubjectRe: [RFC PATCH v1 3/5] KVM: Add paravirt kvm_flush_tlb_others
    On 05/01/2012 03:59 AM, Peter Zijlstra wrote:
    > On Tue, 2012-05-01 at 12:57 +0200, Peter Zijlstra wrote:
    >> Anyway, I don't have any idea about the costs involved with
    >> HAVE_RCU_TABLE_FREE, but I don't think its much.. otherwise these other
    >> platforms (PPC,SPARC) wouldn't have used it, gup_fast() is a very
    >> specific case, whereas mmu-gather is something affecting pretty much all
    >> tasks.
    > Which reminds me, I thought Xen needed this too, but a git grep on
    > HAVE_RCU_TABLE_FREE shows its still only ppc and sparc.
    >
    > Jeremy?

    Yeah, I was thinking that too, but I can't remember what we did to
    resolve it. For pure PV guests, gupf simply isn't used, so the problem
    is moot. But for dom0 or PCI-passthrough it could be.

    Konrad, Stefano?

    J


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