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    SubjectRe: LMbench2.0 results
    Hugh Dickins wrote:
    > On Sun, 8 Sep 2002, Andrew Morton wrote:
    > >
    > > We need to find some way of making vm_enough_memory not call get_page_state
    > > so often. One way of doing that might be to make get_page_state dump
    > > its latest result into a global copy, and make vm_enough_memory()
    > > only get_page_state once per N invokations. A speed/accuracy tradeoff there.
    > Accuracy is not very important in that sysctl_overcommit_memory 0 case
    > e.g. the swapper_space.nr_pages addition was brought in at a time when
    > it was very necessary, but usually overestimates now (or last time I
    > thought about it). The main thing to look out for is running the same
    > memory grabber twice in quick succession: not nice if it succeeds the
    > first time, but not the second, just because of some transient effect
    > that its old pages are temporarily uncounted.

    That's right - there can be sudden and huge changes in pages used/free.

    So any rate limiting tweak in there would have to be in terms of
    number-of-pages rather than number-of-seconds.
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