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    SubjectRe: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19
    Ingo wrote:
    > to clearly stress the 'might easily fail' restriction. But if userspace
    > is well-behaved on Andy's systems (which it seems to be), then in
    > practice it should be resizable.

    At first glance, this is the sticky point that jumps out at me.

    Andy wrote:
    > My experience is that after some days or weeks of running have gone
    > by, there is no possible way short of a reboot to get pages merged
    > effectively back to any pristine state with the infrastructure that
    > exists there.

    I take it, from what Andy writes, and from my other experience with
    similar customers, that his workload is not "well-behaved" in the
    sense you hoped for.

    After several diverse jobs are run, we cannot, so far as I know,
    merge small pages back to big pages.

    I have not played with Mel Gorman's Fragmentation Avoidance patches,
    so don't know if they would provide a substantial improvement here.
    They well might.

    I won't rest till it's the best ...
    Programmer, Linux Scalability
    Paul Jackson <> 1.925.600.0401
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