From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751763AbeEVRrD (ORCPT ); Tue, 22 May 2018 13:47:03 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:41628 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751425AbeEVRqz (ORCPT ); Tue, 22 May 2018 13:46:55 -0400 Date: Tue, 22 May 2018 10:47:11 -0700 From: "Paul E. McKenney" To: Steven Rostedt Cc: Joel Fernandes , byungchul.park@lge.com, mathieu.desnoyers@efficios.com, Josh Triplett , Lai Jiangshan , linux-kernel@vger.kernel.org, kernel-team@android.com Subject: Re: Tasks RCU vs Preempt RCU Reply-To: paulmck@linux.vnet.ibm.com References: <20180519022918.GV3803@linux.vnet.ibm.com> <20180519225905.GB134184@joelaf.mtv.corp.google.com> <20180520004938.GZ3803@linux.vnet.ibm.com> <20180520112843.57079857@grimm.local.home> <20180520191846.GA248075@joelaf.mtv.corp.google.com> <20180521215951.2d6abfcb@gandalf.local.home> <20180522045414.GG40541@joelaf.mtv.corp.google.com> <20180522083832.45353d5f@gandalf.local.home> <20180522160949.GU3803@linux.vnet.ibm.com> <20180522132700.68b6660d@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180522132700.68b6660d@gandalf.local.home> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 18052217-0028-0000-0000-000009AAC571 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009066; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000261; SDB=6.01036108; UDB=6.00530013; IPR=6.00815236; MB=3.00021242; MTD=3.00000008; XFM=3.00000015; UTC=2018-05-22 17:46:52 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18052217-0029-0000-0000-00003AF2084D Message-Id: <20180522174711.GY3803@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-05-22_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1805220191 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 22, 2018 at 01:27:00PM -0400, Steven Rostedt wrote: > On Tue, 22 May 2018 09:09:49 -0700 > "Paul E. McKenney" wrote: > > > Just for the record, if you guys realy want to take over Tasks RCU, > > I have no objections. For one thing, I don't anticipate any other use > > cases for it (famous last words!). But you break it, you buy it! ;-) > > It really matters how much of a burden is RCU_tasks to RCU itself? If > it causes a lot of headache for you, and it prevents you from cleaning > up RCU or making it better, then I would be happy to take it out of RCU > and maintain it separately myself. But if that's not the case, I'm happy > with keeping it within the RCU umbrella. Which brings me to the > question of what motivation does Joel have to remove it? The burden on me from Tasks RCU has been quite light, so no need for a change from my end. Over to you, Joel! ;-) Thanx, Paul