From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755236Ab2CORVX (ORCPT ); Thu, 15 Mar 2012 13:21:23 -0400 Received: from relay3.sgi.com ([192.48.152.1]:36677 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752316Ab2CORVW (ORCPT ); Thu, 15 Mar 2012 13:21:22 -0400 Date: Thu, 15 Mar 2012 12:21:19 -0500 From: Dimitri Sivanich To: "Paul E. McKenney" Cc: Mike Galbraith , linux-kernel@vger.kernel.org Subject: Re: [PATCH RFC] rcu: Limit GP initialization to CPUs that have been online Message-ID: <20120315172119.GA7716@sgi.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> <20120315170236.GF2381@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120315170236.GF2381@linux.vnet.ibm.com> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 15, 2012 at 10:02:36AM -0700, Paul E. McKenney wrote: > 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. > I'll attempt to get that tested yet this week.