From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752993AbbJFUgp (ORCPT ); Tue, 6 Oct 2015 16:36:45 -0400 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:57242 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752293AbbJFUgo (ORCPT ); Tue, 6 Oct 2015 16:36:44 -0400 Date: Tue, 6 Oct 2015 13:36:37 -0700 From: Josh Triplett To: "Paul E. McKenney" Cc: Oleg Nesterov , linux-kernel@vger.kernel.org, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, bobby.prani@gmail.com Subject: Re: [PATCH tip/core/rcu 0/13] percpu-rwsem patches for 4.4 Message-ID: <20151006203637.GA12133@cloud> References: <20151006164514.GA15516@linux.vnet.ibm.com> <20151006174226.GK9600@cloud> <20151006185055.GA15844@redhat.com> <20151006193311.GS3910@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151006193311.GS3910@linux.vnet.ibm.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 06, 2015 at 12:33:11PM -0700, Paul E. McKenney wrote: > On Tue, Oct 06, 2015 at 08:50:56PM +0200, Oleg Nesterov wrote: > > On 10/06, Josh Triplett wrote: > > > > > > For all 13: > > > Reviewed-by: Josh Triplett > > > > Thanks! > > > > > Regarding the rcu_sync infrastructure: odd that an atomic read > > > on the reader proves ligher weight than > > > rcu_read_lock()/rcu_read_unlock(). > > > > Cough... Could you spell? ;) I am just curious and I can't understand > > what do you mean. > > I would guess that Josh is thinking of CONFIG_PREEMPT=n and that you > worked with CONFIG_PREEMPT=y. But it would be good to get this fully > understood. Right. - Josh Triplett