From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757974AbZHQSYi (ORCPT ); Mon, 17 Aug 2009 14:24:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757956AbZHQSYh (ORCPT ); Mon, 17 Aug 2009 14:24:37 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:33036 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757952AbZHQSYh (ORCPT ); Mon, 17 Aug 2009 14:24:37 -0400 Subject: Re: [PATCH -tip/core/rcu 1/6] Cleanups and fixes for RCU in face of heavy CPU-hotplug stress From: Josh Triplett To: paulmck@linux.vnet.ibm.com Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca, dvhltc@us.ibm.com, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, hugh.dickins@tiscali.co.uk, benh@kernel.crashing.org In-Reply-To: <20090815165153.GA8886@linux.vnet.ibm.com> References: <20090815165153.GA8886@linux.vnet.ibm.com> Content-Type: text/plain Date: Mon, 17 Aug 2009 11:24:47 -0700 Message-Id: <1250533487.2709.14.camel@josh-work.beaverton.ibm.com> Mime-Version: 1.0 X-Mailer: Evolution 2.26.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2009-08-15 at 09:51 -0700, Paul E. McKenney wrote: > These pass tests combining rcutorture and continuous CPU-hotplug > operations, in other words, no sleeping between successive CPU-hotplug > operations. This set does not fix the bug involving deadlocks through > rcutorture, kthread_stop(), and migration threads. However, this bug > does not affect production systems, so should not stand in the way of > applying these patches. Commit 63706172f332fd3f6e7458ebfb35fa6de9c21dc5, "kthreads: rework kthread_stop()", looks like it fixes kthread_stop to work concurrently. That may fix the issue you observed. - Josh Triplett