From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161149Ab2CORDw (ORCPT ); Thu, 15 Mar 2012 13:03:52 -0400 Received: from e38.co.us.ibm.com ([32.97.110.159]:54008 "EHLO e38.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161086Ab2CORDs (ORCPT ); Thu, 15 Mar 2012 13:03:48 -0400 Date: Thu, 15 Mar 2012 10:02:36 -0700 From: "Paul E. McKenney" To: Mike Galbraith Cc: Dimitri Sivanich , linux-kernel@vger.kernel.org Subject: Re: [PATCH RFC] rcu: Limit GP initialization to CPUs that have been online Message-ID: <20120315170236.GF2381@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20120314002414.GA21561@linux.vnet.ibm.com> <1331717099.5752.15.camel@marge.simpson.net> <1331728841.7465.7.camel@marge.simpson.net> <20120314130801.GA11722@sgi.com> <20120314151717.GA2435@linux.vnet.ibm.com> <20120314165657.GA19117@linux.vnet.ibm.com> <1331779343.14263.6.camel@marge.simpson.net> <1331780831.14263.15.camel@marge.simpson.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1331780831.14263.15.camel@marge.simpson.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12031517-5518-0000-0000-000002FA02E1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 15, 2012 at 04:07:11AM +0100, Mike Galbraith wrote: > On Thu, 2012-03-15 at 03:42 +0100, Mike Galbraith wrote: > > On Wed, 2012-03-14 at 09:56 -0700, Paul E. McKenney wrote: > > > > > Does the following work better? It does pass my fake-big-system tests > > > (more testing in the works). > > > > Yup, tip booted fine. Thanks! I'll test, see if it gets upset. > > Wedged into 3.0 enterprise booted fine too, is now running rcutorture. > I'll add hotplug after it runs explosion free for a while. Any > suggestions for giving both virgin and 3.0 a thorough trouncing? It would be good to check the latency of RCU's grace-period initialization, and comparing the results with and without this patch. Dimitri might have scripting for that. Thanx, Paul