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[2003:cb:c714:e000:d929:2324:97c7:112c]) by smtp.gmail.com with ESMTPSA id u30-20020adfa19e000000b0032da022855fsm169709wru.111.2023.11.16.11.23.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 16 Nov 2023 11:23:36 -0800 (PST) Message-ID: Date: Thu, 16 Nov 2023 20:23:35 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 6/8] s390/mm: implement MEM_PHYS_ONLINE MEM_PHYS_OFFLINE memory notifiers From: David Hildenbrand To: Sumanth Korikkar Cc: linux-mm , Andrew Morton , Oscar Salvador , Michal Hocko , "Aneesh Kumar K.V" , Anshuman Khandual , Gerald Schaefer , Alexander Gordeev , Heiko Carstens , Vasily Gorbik , linux-s390 , LKML References: <20231114180238.1522782-1-sumanthk@linux.ibm.com> <20231114180238.1522782-7-sumanthk@linux.ibm.com> <458da84d-3838-4c5d-abda-1aebba676186@redhat.com> 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-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 9CEED2000F X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 3r73qf4kjxetwqqgti414aikjfeysazs X-HE-Tag: 1700162622-462371 X-HE-Meta: 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 jcUti6Pj tirEmlQ/1W+VPmrmtN44YKHX8pT6QLpRA18DEF5doJs+jQBPUd0+ZjMIuCldOCKYEt0UQqKVBRHq210d9WpCjgZeeZLr1h4jJLFTV4766tsxfnTOi50hwOLgdSGM73YEDPSojFGzHGyyMxDJnmExqaDxh+CNHJH3rB1gZYAlk4X7GbjKJe/mbJ9BcRTjPgEng1/EDDcrAfs8Htiy0iwbJLmINvaW0T6yhlhX0/r4UtwO2aZFXO4mFdC5AGZscxKY1oTe5/88g7NGXd3mUTg570MCORupOxXo0c1IBSrNG/g5sj6bExSKlZCxm0QQu6FiRIgQTSVwOCo2j4lprqPoGMjMuSN3HJftSlXwVI7pkTxDHFtMtAjLrzhX5EszAD12q12J5HsVnwztpC/ysZ50tf82N6+HauL008t7LBUYmMOwsypG+ApRM9aOVW8EI9wIZBNaKnSDgIwq++ze11ccJfP/XiQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000026, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: >>> >>> Maybe s390x should just provide a dedicate interface to add these memory >>> blocks instead of adding them during boot and then relying on the old way of >>> using online/offline set them online/offline. >> >> Existing behavior: >> The current 'lsmem -a' command displays both online and standby memory. >> >> interface changes: >> If a new interface is introduced and standby memory is no longer listed, >> the following consequences might occur: >> >> 1. Running 'lsmem -a' would only show online memory, potentially leading >> to user complaints. > > That's why the new, clean way of doing it will require a world switch. > If the admin wants the benefits of altmap/memmap allocation, it can be > enabled. BTW, thinking about it, I guess one could teach lsmem (and maybe chmem) to consult additional interfaces on s390x to show standby memory that's not added to the system yet. -- Cheers, David / dhildenb