From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758456Ab1EZU1Q (ORCPT ); Thu, 26 May 2011 16:27:16 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:51507 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757892Ab1EZU1O (ORCPT ); Thu, 26 May 2011 16:27:14 -0400 Date: Thu, 26 May 2011 22:26:53 +0200 From: Ingo Molnar To: "Paul E. McKenney" Cc: Yinghai Lu , linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com, tglx@linutronix.de Subject: Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof" Message-ID: <20110526202653.GB2765@elte.hu> References: <4DDC48E3.1060108@kernel.org> <20110525045253.GB2262@linux.vnet.ibm.com> <4DDD7F96.3090408@kernel.org> <20110525223437.GO2341@linux.vnet.ibm.com> <4DDD8775.1000501@kernel.org> <20110526011310.GP2341@linux.vnet.ibm.com> <20110526013029.GA28103@linux.vnet.ibm.com> <20110526061348.GA26775@elte.hu> <20110526142553.GA2386@linux.vnet.ibm.com> <20110526174301.GA9649@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110526174301.GA9649@linux.vnet.ibm.com> User-Agent: Mutt/1.5.20 (2009-08-17) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Paul E. McKenney wrote: > > > this should also solve load average artifacts - do not > > > TASK_UNINTERRUPTIBLE tasks skew the load upwards? > > > > Quite possibly -- in this case the artifacts would appear just > > after boot, and would disappear as soon as the RCU kthreads had > > something to do. > > By the way, how would you like to proceed with the fixes thus far? > I have put them on -rcu for -next testing, FWIW. I'd suggest to push them to me ASAP, they should get to Linus before -rc1. Thanks, Ingo