Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760573AbZLJH2s (ORCPT ); Thu, 10 Dec 2009 02:28:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760556AbZLJH2q (ORCPT ); Thu, 10 Dec 2009 02:28:46 -0500 Received: from fgwmail7.fujitsu.co.jp ([192.51.44.37]:56628 "EHLO fgwmail7.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760519AbZLJH2p (ORCPT ); Thu, 10 Dec 2009 02:28:45 -0500 X-SecurityPolicyCheck-FJ: OK by FujitsuOutboundMailChecker v1.3.1 From: KOSAKI Motohiro To: LKML Subject: [RFC][PATCH v2 0/8] vmscan: AIM7 scalability improvement Cc: kosaki.motohiro@jp.fujitsu.com, linux-mm , Rik van Riel , Andrea Arcangeli , Larry Woodman Message-Id: <20091210154822.2550.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.50.07 [ja] Date: Thu, 10 Dec 2009 16:28:49 +0900 (JST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 717 Lines: 18 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/