From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 9C4DD6B003D for ; Thu, 10 Dec 2009 02:28:53 -0500 (EST) Received: from m6.gw.fujitsu.co.jp ([10.0.50.76]) by fgwmail6.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id nBA7Sp5P010809 for (envelope-from kosaki.motohiro@jp.fujitsu.com); Thu, 10 Dec 2009 16:28:51 +0900 Received: from smail (m6 [127.0.0.1]) by outgoing.m6.gw.fujitsu.co.jp (Postfix) with ESMTP id BB86145DE51 for ; Thu, 10 Dec 2009 16:28:50 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (s6.gw.fujitsu.co.jp [10.0.50.96]) by m6.gw.fujitsu.co.jp (Postfix) with ESMTP id 99E6845DE50 for ; Thu, 10 Dec 2009 16:28:50 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id 7E4EE1DB8042 for ; Thu, 10 Dec 2009 16:28:50 +0900 (JST) Received: from m105.s.css.fujitsu.com (m105.s.css.fujitsu.com [10.249.87.105]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id 214151DB803E for ; Thu, 10 Dec 2009 16:28:50 +0900 (JST) From: KOSAKI Motohiro Subject: [RFC][PATCH v2 0/8] vmscan: AIM7 scalability improvement Message-Id: <20091210154822.2550.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Date: Thu, 10 Dec 2009 16:28:49 +0900 (JST) Sender: owner-linux-mm@kvack.org To: LKML Cc: kosaki.motohiro@jp.fujitsu.com, linux-mm , Rik van Riel , Andrea Arcangeli , Larry Woodman List-ID: 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? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org