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    SubjectRe: [PATCH 4/12] ksm: break cow once unshared
    Hugh Dickins wrote:
    > We kept agreeing not to bother about the unswappable shared KSM pages
    > which later become unshared by others: observation suggests they're not
    > a significant proportion. But they are disadvantageous, and it is easier
    > to break COW to replace them by swappable pages, than offer statistics
    > to show that they don't matter; then we can stop worrying about them.
    >
    > Doing this in ksm_do_scan, they don't go through cmp_and_merge_page on
    > this pass: give them a good chance of getting into the unstable tree
    > on the next pass, or back into the stable, by computing checksum now.
    >
    > Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
    > ---
    ACK


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