From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761257AbZCTTTv (ORCPT ); Fri, 20 Mar 2009 15:19:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761083AbZCTTTa (ORCPT ); Fri, 20 Mar 2009 15:19:30 -0400 Received: from e2.ny.us.ibm.com ([32.97.182.142]:40223 "EHLO e2.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760843AbZCTTT3 (ORCPT ); Fri, 20 Mar 2009 15:19:29 -0400 Date: Fri, 20 Mar 2009 12:19:26 -0700 From: "Paul E. McKenney" To: Ingo Molnar Cc: Steven Rostedt , LKML , Thomas Gleixner , Peter Zijlstra , Frederic Weisbecker Subject: Re: [PATCH 0/5] [GIT PULL] updates for tip/tracing/ftrace Message-ID: <20090320191926.GJ6698@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20090318031423.981603258@goodmis.org> <20090318055924.GA24627@elte.hu> <20090318073903.GA31341@elte.hu> <20090319073357.GA14615@elte.hu> <20090320174331.GH6698@linux.vnet.ibm.com> <20090320183642.GA2070@elte.hu> <20090320183849.GA3657@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090320183849.GA3657@elte.hu> User-Agent: Mutt/1.5.15+20070412 (2007-04-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 20, 2009 at 07:38:49PM +0100, Ingo Molnar wrote: > > * Ingo Molnar wrote: > > > > > This looks like it is RCU/stop_machine related. The CPU is > > > > stuck in in stop_machine? I see that rcu_torture is running. > > > > Does this go away if you turn off rcu_torture? > > > > > > Grasping at straws... Does Lai's rcu_barrier() fix help? > > > > which one is that? > > ok, found it. Will know in about ~24 hours whether it helps. http://lkml.org/lkml/2009/3/20/71 was the one I was thinking of, just to double-check. Thanx, Paul