From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755291Ab2HaXy5 (ORCPT ); Fri, 31 Aug 2012 19:54:57 -0400 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:37265 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754942Ab2HaXy4 (ORCPT ); Fri, 31 Aug 2012 19:54:56 -0400 X-Originating-IP: 217.70.178.139 X-Originating-IP: 173.246.103.110 Date: Fri, 31 Aug 2012 16:54:46 -0700 From: Josh Triplett To: "Paul E. McKenney" 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, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com, eric.dumazet@gmail.com, darren@dvhart.com, fweisbec@gmail.com, sbw@mit.edu, patches@linaro.org, Alessio Igor Bogani , Avi Kivity , Chris Metcalf , Christoph Lameter , Geoff Levand , Gilad Ben Yossef , Hakan Akkan , "H. Peter Anvin" , Ingo Molnar , Kevin Hilman , Max Krasnyansky , Stephen Hemminger , Sven-Thorsten Dietrich Subject: Re: [PATCH tip/core/rcu 14/26] rcu: Userspace RCU extended QS selftest Message-ID: <20120831235446.GK11771@jtriplet-mobl1> References: <20120830210520.GA2824@linux.vnet.ibm.com> <1346360743-3628-1-git-send-email-paulmck@linux.vnet.ibm.com> <1346360743-3628-14-git-send-email-paulmck@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1346360743-3628-14-git-send-email-paulmck@linux.vnet.ibm.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Aug 30, 2012 at 02:05:31PM -0700, Paul E. McKenney wrote: > From: Frederic Weisbecker > > Provide a config option that enables the userspace > RCU extended quiescent state on every CPUs by default. > > This is for testing purpose. > > Signed-off-by: Frederic Weisbecker > Cc: Alessio Igor Bogani > Cc: Andrew Morton > Cc: Avi Kivity > Cc: Chris Metcalf > Cc: Christoph Lameter > Cc: Geoff Levand > Cc: Gilad Ben Yossef > Cc: Hakan Akkan > Cc: H. Peter Anvin > Cc: Ingo Molnar > Cc: Josh Triplett > Cc: Kevin Hilman > Cc: Max Krasnyansky > Cc: Peter Zijlstra > Cc: Stephen Hemminger > Cc: Steven Rostedt > Cc: Sven-Thorsten Dietrich > Cc: Thomas Gleixner > Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett > init/Kconfig | 8 ++++++++ > kernel/rcutree.c | 2 +- > 2 files changed, 9 insertions(+), 1 deletions(-) > > diff --git a/init/Kconfig b/init/Kconfig > index f6a1830..c26b8a1 100644 > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -451,6 +451,14 @@ config RCU_USER_QS > excluded from the global RCU state machine and thus doesn't > to keep the timer tick on for RCU. > > +config RCU_USER_QS_FORCE > + bool "Force userspace extended QS by default" > + depends on RCU_USER_QS > + help > + Set the hooks in user/kernel boundaries by default in order to > + test this feature that treats userspace as an extended quiescent > + state until we have a real user like a full adaptive nohz option. > + > config RCU_FANOUT > int "Tree-based hierarchical RCU fanout value" > range 2 64 if 64BIT > diff --git a/kernel/rcutree.c b/kernel/rcutree.c > index af92681..ccf3cbf 100644 > --- a/kernel/rcutree.c > +++ b/kernel/rcutree.c > @@ -210,7 +210,7 @@ EXPORT_SYMBOL_GPL(rcu_note_context_switch); > DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks) = { > .dynticks_nesting = DYNTICK_TASK_EXIT_IDLE, > .dynticks = ATOMIC_INIT(1), > -#ifdef CONFIG_RCU_USER_QS > +#if defined(CONFIG_RCU_USER_QS) && !defined(CONFIG_RCU_USER_QS_FORCE) > .ignore_user_qs = true, > #endif > }; > -- > 1.7.8 >