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    SubjectRe: bad lmbench numbers for mmap
    David Miller wrote:
    > 2) The freeing up of page tables at munmap
    > I think #2 could be a possible culprit.
    > Linus, did you see any performance degration of lat_mmap when you
    > added the free_pgtables() stuff into 2.2.x? I think such a problem
    > would trigger if lat_mmap is doing large enough mmap's and they are in
    > the right place.

    Speaking of which. In principle, freeing page tables should make
    munmap() *faster*, because then you don't have to clear the page

    I note 2.2.6-pre3 isn't doing that.

    -- Jamie

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