From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752620AbaHDNcN (ORCPT ); Mon, 4 Aug 2014 09:32:13 -0400 Received: from mx1.redhat.com ([209.132.183.28]:30578 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752176AbaHDNcM (ORCPT ); Mon, 4 Aug 2014 09:32:12 -0400 Date: Mon, 4 Aug 2014 15:29:27 +0200 From: Oleg Nesterov To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, 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 v3 tip/core/rcu 1/9] rcu: Add call_rcu_tasks() Message-ID: <20140804132927.GB18722@redhat.com> References: <20140731215445.GA21933@linux.vnet.ibm.com> <1406843709-23396-1-git-send-email-paulmck@linux.vnet.ibm.com> <20140801141144.GA30293@redhat.com> <20140801182837.GI4784@linux.vnet.ibm.com> <20140801184059.GB10718@redhat.com> <20140802230020.GD8101@linux.vnet.ibm.com> <20140803125758.GA671@redhat.com> <20140803220327.GG8101@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140803220327.GG8101@linux.vnet.ibm.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/03, Paul E. McKenney wrote: > > If I understand correctly, your goal is to remove a synchronize_sched() > worth of latency from the overall RCU-tasks callback latency. Or am I > still confused? Yes, exactly. But again, I am not sure this minor optimization makes sense, mostly I tried to check my understanding. Oleg.