From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755529AbcLSOhn (ORCPT ); Mon, 19 Dec 2016 09:37:43 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:40857 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755578AbcLSOh2 (ORCPT ); Mon, 19 Dec 2016 09:37:28 -0500 Date: Mon, 19 Dec 2016 06:37:28 -0800 From: "Paul E. McKenney" To: Chris Metcalf Cc: Gilad Ben Yossef , Steven Rostedt , Ingo Molnar , Peter Zijlstra , Andrew Morton , Rik van Riel , Tejun Heo , Frederic Weisbecker , Thomas Gleixner , Christoph Lameter , Viresh Kumar , Catalin Marinas , Will Deacon , Andy Lutomirski , Daniel Lezcano , Francis Giraldeau , Andi Kleen , Arnd Bergmann , linux-kernel@vger.kernel.org, boqun.feng@gmail.com Subject: Re: task isolation discussion at Linux Plumbers Reply-To: paulmck@linux.vnet.ibm.com References: <1471382376-5443-1-git-send-email-cmetcalf@mellanox.com> <1605b087-2b3b-77c1-01ac-084e378f5f28@mellanox.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1605b087-2b3b-77c1-01ac-084e378f5f28@mellanox.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16121914-0016-0000-0000-0000057420B2 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006278; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000198; SDB=6.00796029; UDB=6.00386289; IPR=6.00573843; BA=6.00004986; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00013656; XFM=3.00000011; UTC=2016-12-19 14:37:26 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16121914-0017-0000-0000-0000359C3B5F Message-Id: <20161219143728.GA3924@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-12-19_11:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1612050000 definitions=main-1612190193 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Nov 05, 2016 at 12:04:45AM -0400, Chris Metcalf wrote: > A bunch of people got together this week at the Linux Plumbers > Conference to discuss nohz_full, task isolation, and related stuff. > (Thanks to Thomas for getting everyone gathered at one place and time!) Which reminds me... One spirited side discussion at Santa Fe involved RCU's rcu_node tree and CPU numbering. Several people insisted that RCU should remap CPU numbers to allow for interesting CPU-numbering schemes. I resisted this added complexity rather strenuously, but eventually said that I would consider adding such complexity if someone provided me with valid system-level performance data showing a need for this sort of remapping. I haven't heard anything since, so I figured that I should follow up. How are things going collecting this data? Thanx, Paul