From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753016AbcGSIZz (ORCPT ); Tue, 19 Jul 2016 04:25:55 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:24108 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752842AbcGSIZv (ORCPT ); Tue, 19 Jul 2016 04:25:51 -0400 X-IBM-Helo: d06dlp01.portsmouth.uk.ibm.com X-IBM-MailFrom: borntraeger@de.ibm.com X-IBM-RcptTo: linux-arch@vger.kernel.org;linux-kernel@vger.kernel.org;linux-s390@vger.kernel.org Subject: Re: Is THREAD_INFO_IN_TASK appropriate for -mm for 4.8? To: Andy Lutomirski , Andrew Morton , x86 , "linux-kernel@vger.kernel.org" , Borislav Petkov , Linux Arch Mailing List , Oleg Nesterov , "linux-s390@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" References: From: Christian Borntraeger Date: Tue, 19 Jul 2016 10:25:42 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16071908-0016-0000-0000-0000020CBE1A X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16071908-0017-0000-0000-0000224ACE47 Message-Id: <578DE406.9060902@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-07-19_05:,, 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=8.0.1-1604210000 definitions=main-1607190091 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/19/2016 01:47 AM, Andy Lutomirski wrote: > Hi all- > > There are four core patches needed for the THREAD_INFO_IN_TASK thing, > and they apply cleanly to -mm now. The x86 patch to flip the feature > on does not apply cleanly anywhere because it depends on changes in > -tip *and* in -mm. I'd like to get all of this as well as the rest of > the vmap-stacks stuff in by 4.9, but I'm wondering if it might make > sense to get the core THREAD_INFO_IN_TASK stuff into -mm for 4.8 > instead. > > Pros: > - It reduces the amount of core code that -tip will have to carry until 4.9. > - It may benefit other architectures. Christian Borntraeger > expressed an interest in enabling the feature for s390, but it'll be > awkward for him until the core bit landed. Similarly, arm64 seems to > be interested. I have not yet talked to Martin/Heiko about this, so not sure yet if and when s390 is going to use this - so no pressure from our side yet.