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    SubjectRe: [RFC PATCH v1 3/5] KVM: Add paravirt kvm_flush_tlb_others
    On Tue, 2012-05-01 at 15:12 +0300, Avi Kivity wrote:
    > What's changed is not gup_fast() but the performance of munmap(),
    > exit(), and exec(), no?

    If it is indeed cache related like you suggested earlier, it would be
    the allocation side of things, like fork()/mmap() that suffer since
    there's fewer hot pages about, but yes, anything creating/destroying

    > What bounds the amount of memory waiting to be freed during an rcu grace
    > period?

    Most RCU implementations don't have limits, so that could be quite a
    lot. I think preemptible RCU has a batch limit at which point it tries
    rather hard to force a grace period, but I'm not sure if even that
    provides a hard limit.

    Practically though, I haven't had reports of PPC/Sparc going funny
    because of this.

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      Last update: 2012-05-01 17:41    [W:0.021 / U:60.680 seconds]
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