From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754792AbYEOINB (ORCPT ); Thu, 15 May 2008 04:13:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752450AbYEOIMo (ORCPT ); Thu, 15 May 2008 04:12:44 -0400 Received: from e5.ny.us.ibm.com ([32.97.182.145]:45088 "EHLO e5.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752308AbYEOIMn (ORCPT ); Thu, 15 May 2008 04:12:43 -0400 Date: Thu, 15 May 2008 13:50:33 +0530 From: Srivatsa Vaddagiri To: Peter Zijlstra Cc: Mike Galbraith , "Zhang, Yanmin" , Dhaval Giani , LKML , Ingo Molnar , Aneesh Kumar KV Subject: Re: volanoMark regression with kernel 2.6.26-rc1 Message-ID: <20080515082033.GA14823@linux.vnet.ibm.com> Reply-To: vatsa@linux.vnet.ibm.com References: <20080509155240.GH3612@linux.vnet.ibm.com> <1210556351.3151.2.camel@ymzhang> <20080512023758.GN3612@linux.vnet.ibm.com> <1210563200.3151.10.camel@ymzhang> <20080512045246.GP3612@linux.vnet.ibm.com> <1210568533.3151.13.camel@ymzhang> <1210583090.7402.4.camel@marge.simson.net> <1210584047.6524.12.camel@lappy.programming.kicks-ass.net> <20080514134414.GA12693@linux.vnet.ibm.com> <1210777967.10126.17.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1210777967.10126.17.camel@twins> User-Agent: Mutt/1.5.16 (2007-06-09) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 14, 2008 at 05:12:47PM +0200, Peter Zijlstra wrote: > A few other things I found that make a significant difference: One more observation: access to aggregate()->rq_weight etc arent correctly synchronized i.e while a cpu is doing a aggregate_walk_tree() in a domain, and thus possibly modifying rq_weight, load etc, other cpus could be concurrently accessing the same data. As a result, its possible to see inconsistent rq_weight, load, task_weight combination? -- Regards, vatsa