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    SubjectRe: [PATCH v2 0/22] KVM: optimize for MMIO handled
    On 06/22/2011 05:27 PM, Xiao Guangrong wrote:
    > In this version, we fix the bugs in the v1:
    > - fix broken read emulation spans a page boundary
    > - fix invalid spte point is got if we walk shadow page table
    > out of the mmu lock
    > And, we also introduce some rules to modify spte in this version,
    > then it does not need to atomically clear/set spte on x86_32 host
    > anymore, the performance report of x86_32 host is in the later section
    > Avi,
    > I have sampled the operation of lockless shadow page walking as below steps:
    > - mark walk_shadow_page_get_mmio_spte as 'noinline'
    > - do the netperf test, the client is on the guest(NIC is e1000) and the server
    > is on the host, it can generate large press of mmio access
    > - using perf to sample it, and the result of 'perf report' is attached
    > The ratio of walk_shadow_page_get_mmio_spte is 0.09%, the ratio of handle_ept_misconfig
    > is 0.11%, the ratio of handle_mmio_page_fault_common is 0.07%
    > I think it is acceptable, your opinion?


    The patchset scares me, but it is nice work! Good optimization and good
    clean up.

    error compiling committee.c: too many arguments to function

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