linux-kernel - [RFC][PATCH v2 0/8] vmscan: AIM7 scalability improvement

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Date:	Thu, 10 Dec 2009 16:28:49 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm <linux-mm@...ck.org>,
	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>
Subject: [RFC][PATCH v2  0/8] vmscan: AIM7 scalability improvement 

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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