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[2003:d8:2f47:2b00:c5f3:4053:2918:d17c]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b783454d65sm5807523f8f.1.2025.07.28.05.27.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 28 Jul 2025 05:27:30 -0700 (PDT) Message-ID: Date: Mon, 28 Jul 2025 14:27:29 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC] Disable auto_movable_ratio for selfhosted memmap From: David Hildenbrand To: Michal Hocko Cc: Oscar Salvador , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hannes Reinecke References: <2f24e725-cddb-41c5-ba87-783930efb2aa@redhat.com> <79919ace-9cd2-4600-9615-6dc26ba19e19@redhat.com> <1f8d924d-3554-43a6-a75e-66a08d1ce7b9@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/g1oFAmgsLPQFCRvGjuMACgkQTd4Q 9wD/g1o0bxAAqYC7gTyGj5rZwvy1VesF6YoQncH0yI79lvXUYOX+Nngko4v4dTlOQvrd/vhb 02e9FtpA1CxgwdgIPFKIuXvdSyXAp0xXuIuRPQYbgNriQFkaBlHe9mSf8O09J3SCVa/5ezKM OLW/OONSV/Fr2VI1wxAYj3/Rb+U6rpzqIQ3Uh/5Rjmla6pTl7Z9/o1zKlVOX1SxVGSrlXhqt kwdbjdj/csSzoAbUF/duDuhyEl11/xStm/lBMzVuf3ZhV5SSgLAflLBo4l6mR5RolpPv5wad GpYS/hm7HsmEA0PBAPNb5DvZQ7vNaX23FlgylSXyv72UVsObHsu6pT4sfoxvJ5nJxvzGi69U s1uryvlAfS6E+D5ULrV35taTwSpcBAh0/RqRbV0mTc57vvAoXofBDcs3Z30IReFS34QSpjvl Hxbe7itHGuuhEVM1qmq2U72ezOQ7MzADbwCtn+yGeISQqeFn9QMAZVAkXsc9Wp0SW/WQKb76 FkSRalBZcc2vXM0VqhFVzTb6iNqYXqVKyuPKwhBunhTt6XnIfhpRgqveCPNIasSX05VQR6/a OBHZX3seTikp7A1z9iZIsdtJxB88dGkpeMj6qJ5RLzUsPUVPodEcz1B5aTEbYK6428H8MeLq NFPwmknOlDzQNC6RND8Ez7YEhzqvw7263MojcmmPcLelYbfOwU0EVcufkQEQAOfX3n0g0fZz 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+DWgUCaCwtJQUJG8aPFAAKCRBN3hD3AP+DWlDnD/4k2TW+HyOOOePVm23F5HOhNNd7nNv3 Vq2cLcW1DteHUdxMO0X+zqrKDHI5hgnE/E2QH9jyV8mB8l/ndElobciaJcbl1cM43vVzPIWn 01vW62oxUNtEvzLLxGLPTrnMxWdZgxr7ACCWKUnMGE2E8eca0cT2pnIJoQRz242xqe/nYxBB /BAK+dsxHIfcQzl88G83oaO7vb7s/cWMYRKOg+WIgp0MJ8DO2IU5JmUtyJB+V3YzzM4cMic3 bNn8nHjTWw/9+QQ5vg3TXHZ5XMu9mtfw2La3bHJ6AybL0DvEkdGxk6YHqJVEukciLMWDWqQQ RtbBhqcprgUxipNvdn9KwNpGciM+hNtM9kf9gt0fjv79l/FiSw6KbCPX9b636GzgNy0Ev2UV m00EtcpRXXMlEpbP4V947ufWVK2Mz7RFUfU4+ETDd1scMQDHzrXItryHLZWhopPI4Z+ps0rB CQHfSpl+wG4XbJJu1D8/Ww3FsO42TMFrNr2/cmqwuUZ0a0uxrpkNYrsGjkEu7a+9MheyTzcm vyU2knz5/stkTN2LKz5REqOe24oRnypjpAfaoxRYXs+F8wml519InWlwCra49IUSxD1hXPxO WBe5lqcozu9LpNDH/brVSzHCSb7vjNGvvSVESDuoiHK8gNlf0v+epy5WYd7CGAgODPvDShGN g3eXuA== Organization: Red Hat In-Reply-To: <1f8d924d-3554-43a6-a75e-66a08d1ce7b9@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: WP-tYitoyF0N6EIHM6I7tD1sT66K6wYf7BFlHHueZIs_1753705651 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: 982F1C0008 X-Rspamd-Server: rspam06 X-Stat-Signature: iaz1nk4xywjama4zw46fzpxqotk6c87j X-HE-Tag: 1753705655-390348 X-HE-Meta: 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 R1aR531Y usdWRUeRIFawD+lnQuiXwZgge1QvtUwGkZUU9DuVQyv209JVQFV0nX7Vjm0j5SU4gOhWwuGrLrHWUBk9Bt1csVTEjZ3wjaptq19kcbYHl0DR9Kz8jmdqp9uqN8loWuFSfST/2O7bGTqOHXBn9xjoNoBkzGBWE7XxQJJ3rQhieeR667mAIoPnBv+Y/IAulANDmQJeL7eZ0FTBaSeWc6pb9ZeUji7Q1WYFepGUoQod0PRy5CyOLLA2+VDEHj2KaljTnjzLOUNoAjxhthQG9Z5fb6zG0xsJn5i/JFExPXf7nngFEAIrsCsWM26GoXVnaYRL8vv19cxvcBTm18Z+YRBs2c7ea026q6q1Uvj1dBiEXDlSWcgJVWjQKWDrp74E6gK9qQ0tj8oUcGJ+pZOCJIR0wWCFefRWDDOb1Onwrv26Vd0hz8OlTE4JsAfoJQzZZTCW0heOrpyK+uPZivgVaCfz+xI0TyZCHeEM3CXebj41ZAI6v+7/s4/UsFfnavay9eFK8VHk4bP7vCpfChEQpJjH9ZmdP+g== 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 28.07.25 14:27, David Hildenbrand wrote: > On 28.07.25 14:17, Michal Hocko wrote: >> On Mon 28-07-25 11:10:44, David Hildenbrand wrote: >>> On 28.07.25 11:04, Michal Hocko wrote: >>>> On Mon 28-07-25 10:53:08, David Hildenbrand wrote: >> [...] >>>>> daxctl wants to online memory itself. We want to keep that memory offline >>>>> from a kernel perspective and let daxctl handle it in this case. >>>>> >>>>> We have that problem in RHEL where we currently require user space to >>>>> disable udev rules so daxctl "can win". >>>> >>>> ... this is the result. Those shouldn't really race. If udev is suppose >>>> to see the device then only in its entirity so regular memory block >>>> based onlining rules shouldn't even see that memory. Or am I completely >>>> missing the picture? >>> >>> We can't break user space, which relies on individual memory blocks. >> >> We do have userspace which onlines specific memory blocks and we cannot >> break that. But do we have any userspace that wants to online CXL like >> memory (or in general dax like memory) that would need to operate on >> those memory blocks with that kind of granularity? > > I'm afraid that ship has sailed. > >> >> In other words what would break if we didn't expose CXL memory through >> memory blocks in sysfs? > > I think the whole libdaxctl handling for onlining memory is based on that. > Sorry, forgot to add a pointer: https://github.com/pmem/ndctl/blob/main/daxctl/lib/libdaxctl.c -- Cheers, David / dhildenb