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Wed, 08 Jul 2020 02:59:25 -0400 X-MC-Unique: _TFbW2XVPn-VrCKTbkvjFg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 076AF805EF3; Wed, 8 Jul 2020 06:59:23 +0000 (UTC) Received: from [10.36.113.117] (ovpn-113-117.ams2.redhat.com [10.36.113.117]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6CE2B5BAC3; Wed, 8 Jul 2020 06:59:19 +0000 (UTC) Subject: Re: [PATCH v2 1/3] arm64/numa: export memory_add_physaddr_to_nid as EXPORT_SYMBOL_GPL To: Mike Rapoport , Dan Williams Cc: Justin He , Michal Hocko , Catalin Marinas , Will Deacon , Vishal Verma , Dave Jiang , Andrew Morton , Baoquan He , Chuhong Yuan , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "linux-nvdimm@lists.01.org" , Kaly Xin References: <20200707055917.143653-1-justin.he@arm.com> <20200707055917.143653-2-justin.he@arm.com> <20200707115454.GN5913@dhcp22.suse.cz> <20200708062217.GE386073@linux.ibm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <20200708062217.GE386073@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Rspamd-Queue-Id: 1202718038E6A X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 Content-Transfer-Encoding: quoted-printable 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: On 08.07.20 08:22, Mike Rapoport wrote: > On Tue, Jul 07, 2020 at 09:27:43PM -0700, Dan Williams wrote: >> On Tue, Jul 7, 2020 at 9:08 PM Justin He wrote: >> [..] >>>> Especially for architectures that use memblock info for numa info >>>> (which seems to be everyone except x86) why not implement a generic >>>> memory_add_physaddr_to_nid() that does: >>>> >>>> int memory_add_physaddr_to_nid(u64 addr) >>>> { >>>> unsigned long start_pfn, end_pfn, pfn =3D PHYS_PFN(addr); >>>> int nid; >>>> >>>> for_each_online_node(nid) { >>>> get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); >>>> if (pfn >=3D start_pfn && pfn <=3D end_pfn) >>>> return nid; >>>> } >>>> return NUMA_NO_NODE; >>>> } >>> >>> Thanks for your suggestion, >>> Could I wrap the codes and let memory_add_physaddr_to_nid simply invo= ke >>> phys_to_target_node()? >> >> I think it needs to be the reverse. phys_to_target_node() should call >> memory_add_physaddr_to_nid() by default, but fall back to searching >> reserved memory address ranges in memblock. See phys_to_target_node() >> in arch/x86/mm/numa.c. That one uses numa_meminfo instead of memblock, >> but the principle is the same i.e. that a target node may not be >> represented in memblock.memory, but memblock.reserved. I'm working on >> a patch to provide a function similar to get_pfn_range_for_nid() that >> operates on reserved memory. >=20 > Do we really need yet another memblock iterator? > I think only x86 has memory that is not in memblock.memory but only in > memblock.reserved. Reading about abusing the memblock allcoator once again in memory hotplug paths makes me shiver. --=20 Thanks, David / dhildenb