From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932786Ab1EJI4a (ORCPT ); Tue, 10 May 2011 04:56:30 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:54114 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932131Ab1EJI43 (ORCPT ); Tue, 10 May 2011 04:56:29 -0400 Date: Tue, 10 May 2011 01:56:23 -0700 From: "Paul E. McKenney" To: Yinghai Lu Cc: Ingo Molnar , linux-kernel@vger.kernel.org Subject: Re: [GIT PULL rcu/next] rcu commits for 2.6.40 Message-ID: <20110510085623.GG2258@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20110508151848.GA21906@linux.vnet.ibm.com> <20110509073636.GA18247@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 09, 2011 at 02:09:21PM -0700, Yinghai Lu wrote: > On Mon, May 9, 2011 at 12:36 AM, Ingo Molnar wrote: > > > > * Paul E. McKenney wrote: > > > >> Hello, Ingo, > >> > >> This pull request covers RCU chnages for 2.6.40.  The major new features > >> are RCU priority boosting and the addition of kfree_rcu(), the latter > >> courtesy of Lai Jiangshan.  These two features cover well over half > >> of the commits.  There are a number of smaller features and bug fixes. > >> All have been sent to LKML in the following batches: > >> > >> 0.    https://lkml.org/lkml/2011/2/22/660: RCU priority boosting preview > >> 1.    https://lkml.org/lkml/2011/5/1/19: RCU priority boosting, kfree_rcu() > >> 2.    https://lkml.org/lkml/2011/5/2/40: More uses of kfree_rcu() > >> 3.    https://lkml.org/lkml/2011/5/8/60: miscellaneous > >> > >> The kfree_rcu() uses in the pull request have Acked-by:s from the > >> maintainers.  I have some additional kfree_rcu() requests that lack > >> Acked-by:s, and I will deal with these later. > >> > >> These channges are available in the -rcu git repository at: > >> > >>   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git rcu/next > > > > Pulled, thanks a lot Paul! > > > > it seems with this one in tip, my 8 sockets test setup will report cpu stall. > > after hard code to enable rcu_cpu_stall_suppress > > Index: linux-2.6/kernel/rcutree.c > =================================================================== > --- linux-2.6.orig/kernel/rcutree.c > +++ linux-2.6/kernel/rcutree.c > @@ -174,7 +174,7 @@ module_param(blimit, int, 0); > module_param(qhimark, int, 0); > module_param(qlowmark, int, 0); > > -int rcu_cpu_stall_suppress __read_mostly; > +int rcu_cpu_stall_suppress __read_mostly = 1; > module_param(rcu_cpu_stall_suppress, int, 0644); > > static void force_quiescent_state(struct rcu_state *rsp, int relaxed); > > will get system hang after pnp ACPI init. Could you please send the stack traces from the RCU CPU stall? Also, you do have ce31332d3c77532d6ea97ddcb475a2b02dd358b4 applied, correct? Thanx, Paul