Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932187Ab2FNQ6o (ORCPT ); Thu, 14 Jun 2012 12:58:44 -0400 Received: from e36.co.us.ibm.com ([32.97.110.154]:47338 "EHLO e36.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756362Ab2FNQ6n (ORCPT ); Thu, 14 Jun 2012 12:58:43 -0400 Date: Thu, 14 Jun 2012 09:48:25 -0700 From: "Paul E. McKenney" To: Thomas Gleixner Cc: LKML , Peter Zijlstra , Ingo Molnar , "Srivatsa S. Bhat" , Rusty Russell , Tejun Heo Subject: Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu hotplug threads Message-ID: <20120614164825.GH2458@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20120613191745.GG2427@linux.vnet.ibm.com> <20120613204725.GA9858@linux.vnet.ibm.com> <20120614045125.GA30257@linux.vnet.ibm.com> <20120614125939.GC2443@linux.vnet.ibm.com> <20120614145038.GB2458@linux.vnet.ibm.com> <20120614153828.GA31135@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12061416-7606-0000-0000-0000012001BB Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1535 Lines: 36 On Thu, Jun 14, 2012 at 06:19:50PM +0200, Thomas Gleixner wrote: > On Thu, 14 Jun 2012, Paul E. McKenney wrote: > > > On Thu, Jun 14, 2012 at 07:50:38AM -0700, Paul E. McKenney wrote: > > > On Thu, Jun 14, 2012 at 03:32:19PM +0200, Thomas Gleixner wrote: > > > > On Thu, 14 Jun 2012, Paul E. McKenney wrote: > > > > > On Thu, Jun 14, 2012 at 01:20:39PM +0200, Thomas Gleixner wrote: > > > > > > I gave it a quick shot, but I was not able to reproduce the hang yet. > > > > > > > > > > Really? I have a strictly Western-Hemisphere bug? ;-) > > > > > > > > I guess I need to fire up rcu torture to make it surface. > > > > > > A simple offline was triggering it for me. Perhaps some of my debug > > > code was inappropriate, will retry. > > > > And removing my debug code did the trick. I guess some of it was really > > just bug code. In any case, it now passes short rcutorture testing for > > me as well. > > > > However, I do see the splat shown below. The splat confuses me greatly, > > as I thought that this kthread should be affinitied to a single CPU and > > thus smp_processor_id() should refrain from splatting. I don't see any > > sort of "I broke affinity" message from the scheduler. > > Hmm. Is that reproducible ? Twice so far, will retry. Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/