From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 158D9C433E0 for ; Wed, 12 Aug 2020 06:01:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E4B19206C3 for ; Wed, 12 Aug 2020 06:01:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="L3I3u9z7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726572AbgHLGBV (ORCPT ); Wed, 12 Aug 2020 02:01:21 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:31134 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725944AbgHLGBV (ORCPT ); Wed, 12 Aug 2020 02:01:21 -0400 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 07C5mCij059518; Wed, 12 Aug 2020 02:01:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=date : from : to : cc : subject : message-id : reply-to : references : mime-version : content-type : in-reply-to; s=pp1; bh=Flytr8k2939r01rScwjBxWieA0ZKAN00UvMze6baDuU=; b=L3I3u9z7Oj5Aj0x3Gjc8mkcJSMyILV1bwMDd6mSk/RPN8brB/+DRw6fZz5iyPaVbwcRq GypubXC0xCVf07SJwWpKxEscBe2baGJJovxo0XZMD+LdBBmYKGwQPxtLhrmbUEpKSbzS xkVeXWs/uIoYAUj4IVLaDlLkCnSiLCtLsaNOyil6yKpciwViD3GpR9FxO6kFWfbncG4x eJW8PIKgggfN+UfUWDdGl9DrEtRiAsDW1DTeCig3OTvMXmmZHOx1UnIc+0MGJivMYCvL 61+9AmjlBdcZutyN/v1pj8mo7AJLQbvOf+Fm4aKVg2iZNOLD668k64pGIsa4GzEKNg0C cA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 32vakp07yd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Aug 2020 02:01:10 -0400 Received: from m0098410.ppops.net (m0098410.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 07C5t6EV075791; Wed, 12 Aug 2020 02:01:09 -0400 Received: from ppma06ams.nl.ibm.com (66.31.33a9.ip4.static.sl-reverse.com [169.51.49.102]) by mx0a-001b2d01.pphosted.com with ESMTP id 32vakp07x7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Aug 2020 02:01:09 -0400 Received: from pps.filterd (ppma06ams.nl.ibm.com [127.0.0.1]) by ppma06ams.nl.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 07C5pVWk011342; Wed, 12 Aug 2020 06:01:07 GMT Received: from b06cxnps4075.portsmouth.uk.ibm.com (d06relay12.portsmouth.uk.ibm.com [9.149.109.197]) by ppma06ams.nl.ibm.com with ESMTP id 32skahc22b-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Aug 2020 06:01:06 +0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 07C614ei26607962 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 12 Aug 2020 06:01:04 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 866B6AE05F; Wed, 12 Aug 2020 06:01:04 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DEEC3AE05A; Wed, 12 Aug 2020 06:01:01 +0000 (GMT) Received: from linux.vnet.ibm.com (unknown [9.126.150.29]) by d06av26.portsmouth.uk.ibm.com (Postfix) with SMTP; Wed, 12 Aug 2020 06:01:01 +0000 (GMT) Date: Wed, 12 Aug 2020 11:31:01 +0530 From: Srikar Dronamraju To: Andrew Morton Cc: Michal Hocko , Michal Such?nek , David Hildenbrand , Gautham R Shenoy , Linus Torvalds , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Satheesh Rajendran , Mel Gorman , "Kirill A. Shutemov" , linuxppc-dev@lists.ozlabs.org, Christopher Lameter , Vlastimil Babka , Andi Kleen Subject: Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline Message-ID: <20200812060101.GB10992@linux.vnet.ibm.com> Reply-To: Srikar Dronamraju References: <184102af-ecf2-c834-db46-173ab2e66f51@redhat.com> <20200701110145.GC17918@linux.vnet.ibm.com> <0468f965-8762-76a3-93de-3987cf859927@redhat.com> <12945273-d788-710d-e8d7-974966529c7d@redhat.com> <20200701122110.GT2369@dhcp22.suse.cz> <20200703091001.GJ21462@kitsune.suse.cz> <20200703092414.GR18446@dhcp22.suse.cz> <20200703105944.GS18446@dhcp22.suse.cz> <20200703125823.GA26243@linux.vnet.ibm.com> <20200806213211.6a6a56037fe771836e5abbe9@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20200806213211.6a6a56037fe771836e5abbe9@linux-foundation.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-08-11_19:2020-08-11,2020-08-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 adultscore=0 impostorscore=0 phishscore=0 mlxlogscore=999 lowpriorityscore=0 bulkscore=0 spamscore=0 malwarescore=0 suspectscore=0 clxscore=1011 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008120039 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Andrew, Michal, David * Andrew Morton [2020-08-06 21:32:11]: > On Fri, 3 Jul 2020 18:28:23 +0530 Srikar Dronamraju wrote: > > > > The memory hotplug changes that somehow because you can hotremove numa > > > nodes and therefore make the nodemask sparse but that is not a common > > > case. I am not sure what would happen if a completely new node was added > > > and its corresponding node was already used by the renumbered one > > > though. It would likely conflate the two I am afraid. But I am not sure > > > this is really possible with x86 and a lack of a bug report would > > > suggest that nobody is doing that at least. > > > > > > > JFYI, > > Satheesh copied in this mailchain had opened a bug a year on crash with vcpu > > hotplug on memoryless node. > > > > https://bugzilla.kernel.org/show_bug.cgi?id=202187 > > So... do we merge this patch or not? Seems that the overall view is > "risky but nobody is likely to do anything better any time soon"? Can we decide on this one way or the other? -- Thanks and Regards Srikar Dronamraju