From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754473AbYLCBAO (ORCPT ); Tue, 2 Dec 2008 20:00:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755991AbYLCA7q (ORCPT ); Tue, 2 Dec 2008 19:59:46 -0500 Received: from one.firstfloor.org ([213.235.205.2]:39715 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755655AbYLCA7n (ORCPT ); Tue, 2 Dec 2008 19:59:43 -0500 Date: Wed, 3 Dec 2008 02:10:42 +0100 From: Andi Kleen To: "Paul E. McKenney" Cc: Andi Kleen , linux-kernel@vger.kernel.org, cl@linux-foundation.org, mingo@elte.hu, akpm@linux-foundation.org, manfred@colorfullife.com, dipankar@in.ibm.com, josht@linux.vnet.ibm.com, schamp@sgi.com, niv@us.ibm.com, dvhltc@us.ibm.com, ego@in.ibm.com, laijs@cn.fujitsu.com, rostedt@goodmis.org, peterz@infradead.org, penberg@cs.helsinki.fi, tglx@linutronix.de Subject: Re: [PATCH -tip] v9 scalable classic RCU implementation Message-ID: <20081203011042.GH6703@one.firstfloor.org> References: <20081202222157.GA14911@linux.vnet.ibm.com> <20081202233144.GE6703@one.firstfloor.org> <20081202235145.GF6719@linux.vnet.ibm.com> <20081203001811.GF6703@one.firstfloor.org> <20081203004759.GG6719@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081203004759.GG6719@linux.vnet.ibm.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Power, I see a hang in all three flavors of RCU when CPU hotplug > is enabled and dynticks is not. I have not yet seen this hang on x86. > On Power, the hang occurs in the CPU-offline code, and is identical to > the hangs I was seeing in 2.6.27, except that "sleep 1" does not hang > in recent 2.6.28 versions. So the timeout is apparently failing to fire > (or being ignored) for some other reason. > > Is this similar to what you are seeing on x86? Yes it is. -Andi -- ak@linux.intel.com