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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: [RFC][PATCH v2  0/8] vmscan: AIM7 scalability improvement 
Cc: kosaki.motohiro@jp.fujitsu.com, LKML <linux-kernel@vger.kernel.org>,
       linux-mm <linux-mm@kvack.org>, Rik van Riel <riel@redhat.com>,
       Andrea Arcangeli <aarcange@redhat.com>,
       Larry Woodman <lwoodman@redhat.com>
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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?

this patches is made ontop mmotm1208.