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    SubjectRe: [PATCH v9] mm: compaction: handle incorrect MIGRATE_UNMOVABLE type pageblocks
    On Tue, Jun 05, 2012 at 03:05:40PM +0900, Minchan Kim wrote:
    > > Let's throw it away until the author send us data.
    > >
    >
    > I guess it's hard to make such workload to prove it's useful normally.
    > But we can't make sure there isn't such workload in the world.
    > So I hope listen VOC. At least, Mel might require it.
    >

    I'm playing a lot of catch-up at the moment after being out for a few days
    so sorry for my silence on this and other threads.

    My initial support for this patch was based on an artifical load but one I
    felt was plausible to trigger if CMA was being used. In a normal workload
    I thought it might be possible to hit if a large process exited freeing
    a lot of pagetable pages from MIGRATE_UNMOVABLE blocks at the same time
    but that is a little unlikely and a test case would also look very artifical.

    Hence, I believe that if you require a real workload to demonstrate the
    benefit of the patch that it will be very difficult to find. The primary
    decision is if CMA needs this or not. I was under the impression that it
    was a help for CMA allocation success rates but I may be mistaken.

    --
    Mel Gorman
    SUSE Labs


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