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    SubjectRe: [PATCH mmotm] ksm: antidote to MADV_MERGEABLE HWPOISON
    On Fri, Aug 21, 2009 at 07:30:15PM +0100, Hugh Dickins wrote:
    > linux-next is now sporting MADV_HWPOISON at 12, which would have a very
    > nasty effect on KSM if you had CONFIG_MEMORY_FAILURE=y with CONFIG_KSM=y.
    > Shift MADV_MERGEABLE and MADV_UNMERGEABLE down two - two to reduce the
    > confusion if old and new userspace and kernel are mismatched.
    >
    > Personally I'd prefer the MADV_HWPOISON testing feature to shift; but
    > linux-next comes first in the mmotm lineup, and I can't be sure that
    > madvise KSM already has more users than there are HWPOISON testers:
    > so unless Andi is happy to shift MADV_HWPOISON, mmotm needs this.

    Thanks for catching.

    Shifting is fine, but I would prefer then if it was to some
    value that is not reused (like 100) so that I can probe for it
    in the test programs.

    -Andi


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