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Tue, 18 Aug 2020 07:49:23 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A36E211C050; Tue, 18 Aug 2020 07:49:23 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0606B11C04C; Tue, 18 Aug 2020 07:49:21 +0000 (GMT) Received: from linux.vnet.ibm.com (unknown [9.126.150.29]) by d06av25.portsmouth.uk.ibm.com (Postfix) with SMTP; Tue, 18 Aug 2020 07:49:20 +0000 (GMT) Date: Tue, 18 Aug 2020 13:19:20 +0530 From: Srikar Dronamraju To: Michal Hocko Cc: David Hildenbrand , Andrew Morton , Michal Such?nek , 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 , "Aneesh Kumar K.V" Subject: Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline Message-ID: <20200818074920.GA3698@linux.vnet.ibm.com> Reply-To: Srikar Dronamraju References: <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> <20200812060101.GB10992@linux.vnet.ibm.com> <13a85e52-5caa-24a8-7169-3992b1ad262a@redhat.com> <20200818073712.GK28270@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20200818073712.GK28270@dhcp22.suse.cz> 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=2020-08-18_04:2020-08-18,2020-08-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 adultscore=0 clxscore=1011 priorityscore=1501 phishscore=0 mlxscore=0 mlxlogscore=999 spamscore=0 bulkscore=0 lowpriorityscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008180051 X-Rspamd-Queue-Id: 5A36418140B60 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: * Michal Hocko [2020-08-18 09:37:12]: > On Tue 18-08-20 09:32:52, David Hildenbrand wrote: > > On 12.08.20 08:01, Srikar Dronamraju wrote: > > > 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. > > >>>> > > >> 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? > > > > Hmm, not sure who's the person to decide. I tend to prefer doing the > > node renaming, handling this in ppc code; > > Agreed. That would be a safer option. Okay, will send arch specific v6 version. > -- > Michal Hocko > SUSE Labs -- Thanks and Regards Srikar Dronamraju