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    Subject[RFC][PATCH v2 0/8] vmscan: AIM7 scalability improvement
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    Larry Woodman reported current VM has big performance regression when
    AIM7 benchmark. It use very much processes and fork/exit/page-fault frequently.
    (i.e. it makes serious lock contention of ptelock and anon_vma-lock.)

    At 2.6.28, we removed calc_reclaim_mapped() and it made vmscan, then
    vmscan always call page_referenced() although VM pressure is low.
    It increased lock contention more, unfortunately.


    Larry, can you please try this patch series on your big box?





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