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    SubjectRe: [PATCH v3 11/11] KVM: MMU: improve write flooding detected
    On 09/13/2011 10:19 PM, Xiao Guangrong wrote:
    > >
    > > The spte may not be accessed, but other sptes in the same page can be accessed. An example is the fixmap area for kmap_atomic(), there will be a lot of pte writes but other sptes will be accessed without going through soft-mmu at all.
    >
    > I think this kind of shadow pae is mostly the last page table(level=1), maybe
    > we can skip the write-flooding for the last shadow page, because the last shadow
    > page can become unsync and it can not let page table write-protected.

    Yes.

    >
    > > I think you have to read the parent_ptes->spte.accessed bits to be sure.
    > >
    >
    > I guess the overload of this way is little high:
    > - it needs to walk parent ptes for every shadow pages
    > - we need to clear the parent_ptes->spte.accessed bit when the page is written, and
    > the tlb flush is needed.
    > no?
    >

    Right.

    --
    error compiling committee.c: too many arguments to function



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