From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761281Ab2COSXd (ORCPT ); Thu, 15 Mar 2012 14:23:33 -0400 Received: from e38.co.us.ibm.com ([32.97.110.159]:48512 "EHLO e38.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752022Ab2COSXb (ORCPT ); Thu, 15 Mar 2012 14:23:31 -0400 Date: Thu, 15 Mar 2012 11:23:15 -0700 From: "Paul E. McKenney" To: Dimitri Sivanich Cc: Mike Galbraith , linux-kernel@vger.kernel.org Subject: Re: [PATCH RFC] rcu: Limit GP initialization to CPUs that have been online Message-ID: <20120315182314.GK2381@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> <20120315175857.GA8705@sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120315175857.GA8705@sgi.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12031518-5518-0000-0000-000002FA7D8C Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 15, 2012 at 12:58:57PM -0500, Dimitri Sivanich wrote: > On Wed, Mar 14, 2012 at 09:56:57AM -0700, Paul E. McKenney wrote: > > On Wed, Mar 14, 2012 at 08:17:17AM -0700, Paul E. McKenney wrote: > > > On Wed, Mar 14, 2012 at 08:08:01AM -0500, Dimitri Sivanich wrote: > > > > On Wed, Mar 14, 2012 at 01:40:41PM +0100, Mike Galbraith wrote: > > > > > On Wed, 2012-03-14 at 10:24 +0100, Mike Galbraith wrote: > > > > > > On Tue, 2012-03-13 at 17:24 -0700, Paul E. McKenney wrote: > > > > > > > The following builds, but is only very lightly tested. Probably full > > > > > > > of bug, especially when exercising CPU hotplug. > > > > > > > > > > > > You didn't say RFT, but... > > > > > > > > > > > > To beat on this in a rotund 3.0 kernel, the equivalent patch would be > > > > > > the below? My box may well answer that before you can.. hope not ;-) > > > > > > > > > > (Darn, it did. Box says boot stall with virgin patch in tip too though. > > > > > Wedging it straight into 3.0 was perhaps a tad premature;) > > > > > > > > I saw the same thing with 3.3.0-rc7+ and virgin patch on UV. Boots fine without the patch. > > > > > > Right... Bozo here forgot to set the kernel parameters for large-system > > > emulation during testing. Apologies for the busted patch, will fix. > > > > > > And thank you both for the testing!!! > > > > > > Hey, at least I labeled it "RFC". ;-) > > > > Does the following work better? It does pass my fake-big-system tests > > (more testing in the works). > > This one stalls for me at the same place the other one did. Once again, > if I remove the patch and rebuild, it boots just fine. > > Is there some debug/trace information that you would like me to provide? Very strange. Could you please send your dmesg and .config? Thanx, Paul