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    SubjectRe: [PATCH] low-latency zap_page_range()
    On Thu, 29 Aug 2002, Andrew Morton wrote:

    > > So we know it is held forever and a day... but is there contention?
    >
    > I'm sure there is, but nobody has measured the right workload.
    >
    > Two CLONE_MM threads, one running mmap()/munmap(), the other trying
    > to fault in some pages. I'm sure someone has some vital application
    > which does exactly this. They always do :(

    Can't fix this one. The mmap()/munmap() needs to have the
    mmap_sem for writing as long as its setting up or tearing
    down a VMA while the pagefault path takes the mmap_sem for
    reading.

    It might be fixable in some dirty way, but I doubt that'll
    ever be worth it.

    regards,

    Rik
    --
    Bravely reimplemented by the knights who say "NIH".

    http://www.surriel.com/ http://distro.conectiva.com/

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