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    SubjectRe: [RFC][PATCHSET] mremap/mmap mess
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    From: Hugh Dickins <hugh.dickins@tiscali.co.uk>
    Date: Tue, 8 Dec 2009 13:03:30 +0000 (GMT)

    > That would impose some (unacceptable?) limits, and require some funny
    > code to migrate the pages over to the new mm later (instead of
    > relocating within the new mm as we do now).

    I think this approach would create new failure cases that don't exist
    now. Whether that's acceptable or not is another issue.

    The forced page table move, and TLB+cache flush that goes along with
    that, for every single compat task we get now on the other hand is not
    acceptable :-)

    I also think this page table move overhead is worse than the
    non-swapability added by Al's approach.


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