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    Subjectshared memory is over-counted N times when calculating badness()
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    In oom_kill.c, badness() counts half the total_vm of all the children
    against the parent.

    The problem with this calculation is that, if the parent and children
    share memory, the shared memory is over-counted N/2 times where N is the
    number of children.

    There's already a hard limit on the amount of shared memory, so it's
    unlikely that process is runaway due to shared memory consumption, and
    shouldn't add to a process's badness() score.

    Shouldn't it just use (total_vm - shared_vm) instead, and never even
    count shared memory?

    Regards,
    Jeff Davis

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