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[37.188.168.3]) by smtp.gmail.com with ESMTPSA id i10sm11795002edx.42.2020.07.03.02.24.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Jul 2020 02:24:16 -0700 (PDT) Date: Fri, 3 Jul 2020 11:24:14 +0200 From: Michal Hocko To: Michal =?iso-8859-1?Q?Such=E1nek?= Cc: David Hildenbrand , Gautham R Shenoy , Srikar Dronamraju , Linus Torvalds , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Satheesh Rajendran , Mel Gorman , "Kirill A. Shutemov" , Andrew Morton , 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: <20200703092414.GR18446@dhcp22.suse.cz> References: <20200624092846.9194-1-srikar@linux.vnet.ibm.com> <20200624092846.9194-4-srikar@linux.vnet.ibm.com> <20200701084200.GN2369@dhcp22.suse.cz> <20200701100442.GB17918@linux.vnet.ibm.com> <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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200703091001.GJ21462@kitsune.suse.cz> X-Rspamd-Queue-Id: CCCF21009D5C3 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: [Cc Andi] On Fri 03-07-20 11:10:01, Michal Suchanek wrote: > On Wed, Jul 01, 2020 at 02:21:10PM +0200, Michal Hocko wrote: > > On Wed 01-07-20 13:30:57, David Hildenbrand wrote: [...] > > > Yep, looks like it. > > > > > > [ 0.009726] SRAT: PXM 1 -> APIC 0x00 -> Node 0 > > > [ 0.009727] SRAT: PXM 1 -> APIC 0x01 -> Node 0 > > > [ 0.009727] SRAT: PXM 1 -> APIC 0x02 -> Node 0 > > > [ 0.009728] SRAT: PXM 1 -> APIC 0x03 -> Node 0 > > > [ 0.009731] ACPI: SRAT: Node 0 PXM 1 [mem 0x00000000-0x0009ffff] > > > [ 0.009732] ACPI: SRAT: Node 0 PXM 1 [mem 0x00100000-0xbfffffff] > > > [ 0.009733] ACPI: SRAT: Node 0 PXM 1 [mem 0x100000000-0x13fffffff] > > > > This begs a question whether ppc can do the same thing? > Or x86 stop doing it so that you can see on what node you are running? > > What's the point of this indirection other than another way of avoiding > empty node 0? Honestly, I do not have any idea. I've traced it down to Author: Andi Kleen Date: Tue Jan 11 15:35:48 2005 -0800 [PATCH] x86_64: Fix ACPI SRAT NUMA parsing Fix fallout from the recent nodemask_t changes. The node ids assigned in the SRAT parser were off by one. I added a new first_unset_node() function to nodemask.h to allocate IDs sanely. Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds which doesn't really tell all that much. The historical baggage and a long term behavior which is not really trivial to fix I suspect. -- Michal Hocko SUSE Labs