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Wed, 08 Jul 2020 03:16:08 -0400 X-MC-Unique: g9Z8KC3yNxm1InmXP6I2-g-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 078DD107ACCA; Wed, 8 Jul 2020 07:16:06 +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 E375A10013D7; Wed, 8 Jul 2020 07:16:02 +0000 (UTC) Subject: Re: [PATCH v2 1/3] arm64/numa: export memory_add_physaddr_to_nid as EXPORT_SYMBOL_GPL To: Dan Williams Cc: Mike Rapoport , 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: Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Rspamd-Queue-Id: 25C611803F9A9 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 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 09:04, Dan Williams wrote: > On Tue, Jul 7, 2020 at 11:59 PM David Hildenbrand wr= ote: >> >> 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 generi= c >>>>>> 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 in= voke >>>>> phys_to_target_node()? >>>> >>>> I think it needs to be the reverse. phys_to_target_node() should cal= l >>>> 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 membloc= k, >>>> 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 o= n >>>> a patch to provide a function similar to get_pfn_range_for_nid() tha= t >>>> operates on reserved memory. >>> >>> Do we really need yet another memblock iterator? >>> I think only x86 has memory that is not in memblock.memory but only i= n >>> memblock.reserved. >> >> Reading about abusing the memblock allcoator once again in memory >> hotplug paths makes me shiver. >=20 > Technical reasoning please? ARCH_KEEP_MEMBLOCK is (AFAIK) only a hack for arm64 to implement pfn_valid(), because they zap out individual pages corresponding to memory holes of full sections. I am not a friend of adding more post-init code to rely on memblock data. It just makes it harder to eventually get rid of ARCH_KEEP_MEMBLOCK= . >=20 > arm64 numa information is established from memblock data. It seems > counterproductive to ignore that fact if we're already touching > memory_add_physaddr_to_nid() and have a use case for a driver to call > it. ... and we are trying to handle the "only a single dummy node" case (patch #2), or what am I missing? What is there to optimize currently? --=20 Thanks, David / dhildenb