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    SubjectRe: [PATCH -mm] vmscan: make mapped executable pages the first class citizen
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    > side effects
    > ------------
    >
    > This patch is safe in general, it restores the pre-2.6.28 mmap() behavior
    > but in a much smaller and well targeted scope.
    >
    > One may worry about some one to abuse the PROT_EXEC heuristic. But as
    > Andrew Morton stated, there are other tricks to getting that sort of boost.
    >
    > Another concern is the PROT_EXEC mapped pages growing large in rare cases,
    > and therefore hurting reclaim efficiency. But a sane application targeted for
    > large audience will never use PROT_EXEC for data mappings. If some home made
    > application tries to abuse that bit, it shall be aware of the consequences,
    > which won't be disastrous even in the worst case.

    ok, I lose.
    if you can post good mesurement result, I'll ack this.





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