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Thu, 09 Apr 2020 10:41:26 -0400 X-MC-Unique: cRVUOBR5Nx2JHnnd5Bfdcg-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4E8F08017F3; Thu, 9 Apr 2020 14:41:23 +0000 (UTC) Received: from localhost (ovpn-12-133.pek2.redhat.com [10.72.12.133]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0F81E391; Thu, 9 Apr 2020 14:41:22 +0000 (UTC) Date: Thu, 9 Apr 2020 22:41:19 +0800 From: Baoquan He To: Mike Rapoport , Michal Hocko Subject: Re: [PATCH RFC] mm: remove CONFIG_HAVE_MEMBLOCK_NODE_MAP (was: Re: [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA) Message-ID: <20200409144119.GE2129@MiWiFi-R3L-srv> References: <1585420282-25630-1-git-send-email-Hoan@os.amperecomputing.com> <20200330074246.GA14243@dhcp22.suse.cz> <20200330092127.GB30942@linux.ibm.com> <20200330095843.GF14243@dhcp22.suse.cz> <20200331215618.GG30942@linux.ibm.com> <20200401054227.GC2129@MiWiFi-R3L-srv> <20200401075155.GH30942@linux.ibm.com> <20200402080144.GK22681@dhcp22.suse.cz> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200402080144.GK22681@dhcp22.suse.cz> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200409_074132_268848_6F311EDB X-CRM114-Status: GOOD ( 21.19 ) 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, 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 04/02/20 at 10:01am, Michal Hocko wrote: > On Wed 01-04-20 10:51:55, Mike Rapoport wrote: > > Hi, > > > > On Wed, Apr 01, 2020 at 01:42:27PM +0800, Baoquan He wrote: > [...] > > > From above information, we can remove HAVE_MEMBLOCK_NODE_MAP, and > > > replace it with CONFIG_NUMA. That sounds more sensible to store nid into > > > memblock when NUMA support is enabled. > > > > Replacing CONFIG_HAVE_MEMBLOCK_NODE_MAP with CONFIG_NUMA will work, but > > this will not help cleaning up the whole node/zone initialization mess and > > we'll be stuck with two implementations. > > Yeah, this is far from optimal. > > > The overhead of enabling HAVE_MEMBLOCK_NODE_MAP is only for init time as > > most architectures will anyway discard the entire memblock, so having it in > > a UMA arch won't be a problem. The only exception is arm that uses > > memblock for pfn_valid(), here we may also think about a solution to > > compensate the addition of nid to the memblock structures. > > Well, we can make memblock_region->nid defined only for CONFIG_NUMA. > memblock_get_region_node would then unconditionally return 0 on UMA. > Essentially the same way we do NUMA for other MM code. I only see few > direct usage of region->nid. Checked code again, seems HAVE_MEMBLOCK_NODE_MAP is selected directly in all ARCHes which support it. Means HAVE_MEMBLOCK_NODE_MAP is enabled by default on those ARCHes, and has no dependency on CONFIG_NUMA at all. E.g on x86, it just calls free_area_init_nodes() in generic code path, while free_area_init_nodes() is defined in CONFIG_HAVE_MEMBLOCK_NODE_MAP ifdeffery scope. So I tend to agree with Mike to remove HAVE_MEMBLOCK_NODE_MAP firstly on all ARCHes. We can check if it's worth only defining memblock_region->nid for CONFIG_NUMA case after HAVE_MEMBLOCK_NODE_MAP is removed. config X86 def_bool y ... select HAVE_MEMBLOCK_NODE_MAP ... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel