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[2003:cb:c73d:2400:3be1:a856:724c:fd29]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-441c8631256sm40116925e9.20.2025.05.05.01.18.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 05 May 2025 01:18:45 -0700 (PDT) Message-ID: <8180a50d-eebe-4f9b-9ce8-d886654a992d@redhat.com> Date: Mon, 5 May 2025 10:18:43 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/3] driver/base: Optimize memory block registration to reduce boot time To: Mike Rapoport Cc: Oscar Salvador , Donet Tom , Zi Yan , Greg Kroah-Hartman , Andrew Morton , rafael@kernel.org, Danilo Krummrich , Ritesh Harjani , Jonathan Cameron , Alison Schofield , Yury Norov , Dave Jiang , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <188fbfba-afb4-4db7-bbba-7689a96be931@redhat.com> <74c500dd-8d1c-4177-96c7-ddd51ca77306@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: N8HJ1GY2IPrhELx5W-_KcWeqM4O5xAQe_osP-DFTY4w_1746433126 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 972A7A0002 X-Rspamd-Server: rspam04 X-Stat-Signature: tpkt5ha1wdpdacj65wceknhpw5bouam4 X-HE-Tag: 1746433131-609194 X-HE-Meta: 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 FUjUEP9j LY/FxjTEEUCiirYrzM9jVcKGTVOUTNUIrQa+D+M3+dPg1bBdel4SsvpggY01wNe1MgF2mQ1Y3oF5mNibL4DAJOtI8RmpNo5rayv/6TSijdJ/2lErUoTzzT/pPjnE/gCeI4UrN+U6NW4AuSMp4EBWcdi+WMYAWXkNtfBDuLYV80/8RX/8hDcJVsGujoRq5iO50k6fDsuXQ6leRblFOJdpPG56ouPnDPX2JfTejg6e6Use0bWvYmn8BUa8VGUC2O/98Oz1eJHMfdpbHdoRhFS1SIG44njuo5GCtV8osixmRKTeZWeMLGBk6f21kRGtGmQdqiGYHz2DnHuNomf205hsfm+sqqx9jo5YO3QCTf/sugkqzeEz2rDUGFUyaURyCDWUi/Wn5Y5mvBotYBOI+FK+/4UwX9rkTQ2X44Ie8xXMVmsWcNpFxe6y/ZnxlxxkM4MJEs1qJOv8RTKhqHD+Kd0CgIwFZTnACk33epv+C 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: List-Subscribe: List-Unsubscribe: On 05.05.25 09:53, Mike Rapoport wrote: > On Mon, May 05, 2025 at 09:38:43AM +0200, David Hildenbrand wrote: >> On 05.05.25 09:28, Oscar Salvador wrote: >>> On Mon, May 05, 2025 at 09:16:48AM +0200, David Hildenbrand wrote: >>>> memory hotplug code never calls register_one_node(), unless I am missing >>>> something. >>>> >>>> During add_memory_resource(), we call __try_online_node(nid, false), meaning >>>> we skip register_one_node(). >>>> >>>> The only caller of __try_online_node(nid, true) is try_online_node(), called >>>> from CPU hotplug code, and I *guess* that is not required. >>> >>> Well, I guess this is because we need to link the cpus to the node. >>> register_one_node() has two jobs: 1) register cpus belonging to the node >>> and 2) register memory-blocks belonging to the node (if any). >> >> Ah, via __register_one_node() ... >> >> I would assume that an offline node >> >> (1) has no memory >> (2) has no CPUs >> >> When we *hotplug* either memory or CPUs, and we first online the node, there >> is nothing to register. Because if there would be something, the node would >> already be online. >> >> In particular, try_offline_node() will only offline a node if >> >> (A) No present pages: No pages are spanned anymore. This includes >> offline memory blocks. >> (B) No present CPUs. >> >> But maybe there is some case that I am missing ... > > I actually hoped you and Oscar know how that stuff works :) Well, I know how the memory side works, but the CPU side is giving me a hard time :) > > I tried to figure what is going on there and it all looks really convoluted. Jap ... > > So, on boot we have > cpu_up() -> > try_online_node() -> > bails out because all nodes are online (at least on > x86 AFAIU, see 1ca75fa7f19d ("arch/x86/mm/numa: Do > not initialize nodes twice")) > node_dev_init()i -> > register_one_node() -> > this one can use __register_one_node() and loop > over memblock regions. > > And for the hotplug/unplug path, it seems that > register_memory_blocks_under_node(MEMINIT_EARLY) is superfluous, because if > a node had memory it wouldn't get offlined, and if we are hotplugging an > node with memory and cpus, memory hotplug anyway calls > register_memory_blocks_under_node_hotplug(). > > So, IMHO, register_one_node() should not call > register_memory_blocks_under_node() at all, but again, I might have missed > something :) Hm, but someone has to create these links for the memory blocks. It's all very messy :( -- Cheers, David / dhildenb