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

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Message-Id: <20091210165208.256B.A69D9226@jp.fujitsu.com>
Date:	Thu, 10 Dec 2009 16:53:24 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>
Subject: Re: [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?

this patches is made ontop mmotm1208.




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