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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 <>
> ---

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