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Tue, 31 Mar 2020 10:31:48 -0400 X-MC-Unique: RJe3syyjNmOJMo0W4nt5Qw-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3C628107ACCC; Tue, 31 Mar 2020 14:31:44 +0000 (UTC) Received: from localhost (ovpn-13-64.pek2.redhat.com [10.72.13.64]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3D08196F85; Tue, 31 Mar 2020 14:31:43 +0000 (UTC) Date: Tue, 31 Mar 2020 22:31:40 +0800 From: Baoquan He To: Michal Hocko Subject: Re: [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA Message-ID: <20200331143140.GA2402@MiWiFi-R3L-srv> References: <1585420282-25630-1-git-send-email-Hoan@os.amperecomputing.com> <20200330074246.GA14243@dhcp22.suse.cz> <20200330175100.GD30942@linux.ibm.com> <20200330182301.GM14243@dhcp22.suse.cz> <20200331081423.GE30942@linux.ibm.com> <20200331085513.GE30449@dhcp22.suse.cz> <20200331140332.GA2129@MiWiFi-R3L-srv> <20200331142138.GL30449@dhcp22.suse.cz> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200331142138.GL30449@dhcp22.suse.cz> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mmorana@amperecomputing.com, Catalin Marinas , Heiko Carstens , "open list:MEMORY MANAGEMENT" , Paul Mackerras , "H. Peter Anvin" , sparclinux@vger.kernel.org, Alexander Duyck , linux-s390@vger.kernel.org, Michael Ellerman , x86@kernel.org, Mike Rapoport , Christian Borntraeger , Ingo Molnar , Hoan Tran , Benjamin Herrenschmidt , Pavel Tatashin , lho@amperecomputing.com, Vasily Gorbik , Vlastimil Babka , Will Deacon , Borislav Petkov , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Oscar Salvador , linux-kernel@vger.kernel.org, Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S. Miller" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 03/31/20 at 04:21pm, Michal Hocko wrote: > On Tue 31-03-20 22:03:32, Baoquan He wrote: > > Hi Michal, > > > > On 03/31/20 at 10:55am, Michal Hocko wrote: > > > On Tue 31-03-20 11:14:23, Mike Rapoport wrote: > > > > Maybe I mis-read the code, but I don't see how this could happen. In the > > > > HAVE_MEMBLOCK_NODE_MAP=y case, free_area_init_node() calls > > > > calculate_node_totalpages() that ensures that node->node_zones are entirely > > > > within the node because this is checked in zone_spanned_pages_in_node(). > > > > > > zone_spanned_pages_in_node does chech the zone boundaries are within the > > > node boundaries. But that doesn't really tell anything about other > > > potential zones interleaving with the physical memory range. > > > zone->spanned_pages simply gives the physical range for the zone > > > including holes. Interleaving nodes are essentially a hole > > > (__absent_pages_in_range is going to skip those). > > > > > > That means that when free_area_init_core simply goes over the whole > > > physical zone range including holes and that is why we need to check > > > both for physical and logical holes (aka other nodes). > > > > > > The life would be so much easier if the whole thing would simply iterate > > > over memblocks... > > > > The memblock iterating sounds a great idea. I tried with putting the > > memblock iterating in the upper layer, memmap_init(), which is used for > > boot mem only anyway. Do you think it's doable and OK? It yes, I can > > work out a formal patch to make this simpler as you said. The draft code > > is as below. Like this it uses the existing code and involves little change. > > Doing this would be a step in the right direction! I haven't checked the > code very closely though. The below sounds way too simple to be truth I > am afraid. First for_each_mem_pfn_range is available only for > CONFIG_HAVE_MEMBLOCK_NODE_MAP (which is one of the reasons why I keep > saying that I really hate that being conditional). Also I haven't really > checked the deferred initialization path - I have a very vague > recollection that it has been converted to the memblock api but I have > happilly dropped all that memory. Thanks for your quick response and pointing out the rest suspect aspects, I will investigate what you mentioned, see if they impact. > > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > > index 138a56c0f48f..558d421f294b 100644 > > --- a/mm/page_alloc.c > > +++ b/mm/page_alloc.c > > @@ -6007,14 +6007,6 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, > > * function. They do not exist on hotplugged memory. > > */ > > if (context == MEMMAP_EARLY) { > > - if (!early_pfn_valid(pfn)) { > > - pfn = next_pfn(pfn); > > - continue; > > - } > > - if (!early_pfn_in_nid(pfn, nid)) { > > - pfn++; > > - continue; > > - } > > if (overlap_memmap_init(zone, &pfn)) > > continue; > > if (defer_init(nid, pfn, end_pfn)) > > @@ -6130,9 +6122,17 @@ static void __meminit zone_init_free_lists(struct zone *zone) > > } > > > > void __meminit __weak memmap_init(unsigned long size, int nid, > > - unsigned long zone, unsigned long start_pfn) > > + unsigned long zone, unsigned long range_start_pfn) > > { > > - memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY, NULL); > > + unsigned long start_pfn, end_pfn; > > + unsigned long range_end_pfn = range_start_pfn + size; > > + int i; > > + for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { > > + start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn); > > + end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn); > > + if (end_pfn > start_pfn) > > + memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY, NULL); > > + } > > } > > > > static int zone_batchsize(struct zone *zone) > > -- > Michal Hocko > SUSE Labs > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel