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Fri, 03 Apr 2020 03:09:13 -0400 X-MC-Unique: Cvy3b_roPf66oPbJTVFQdA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2400818A6EC1; Fri, 3 Apr 2020 07:09:09 +0000 (UTC) Received: from localhost (ovpn-12-42.pek2.redhat.com [10.72.12.42]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 115A11147D2; Fri, 3 Apr 2020 07:09:07 +0000 (UTC) Date: Fri, 3 Apr 2020 15:09:04 +0800 From: Baoquan He To: Hoan Tran Subject: Re: [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA Message-ID: <20200403070904.GO2402@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> <20200331143140.GA2402@MiWiFi-R3L-srv> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200403_000918_299831_0451FABA X-CRM114-Status: GOOD ( 25.84 ) 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 , Michal Hocko , "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 , Vlastimil Babka , Benjamin Herrenschmidt , Pavel Tatashin , lho@amperecomputing.com, Vasily Gorbik , 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 04/02/20 at 09:46pm, Hoan Tran wrote: > Hi All, > > On 3/31/20 7:31 AM, Baoquan He wrote: > > 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. > > I would like to check if we still move on with my patch to remove > CONFIG_NODES_SPAN_OTHER_NODES and have another patch on top it? I think we would like to replace CONFIG_NODES_SPAN_OTHER_NODES with CONFIG_NUMA, and just let UMA return 0 as node id, as Michal replied in another mail. Anyway, your patch 2~5 are still needed to sit on top of the change of this new plan. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel