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[2003:d8:2f47:2b00:c5f3:4053:2918:d17c]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4586eef77e8sm114032575e9.3.2025.07.28.05.27.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 28 Jul 2025 05:27:03 -0700 (PDT) Message-ID: <1f8d924d-3554-43a6-a75e-66a08d1ce7b9@redhat.com> Date: Mon, 28 Jul 2025 14:27:01 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC] Disable auto_movable_ratio for selfhosted memmap 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> 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/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: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: _Z4AWMChb213pwVgNw5WMOJZAYRNk5V1fAdMrGRIXmc_1753705624 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: eia7e3kw5p1kwoipo77rredpg13pcdq9 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 857D6100009 X-Rspam-User: X-HE-Tag: 1753705627-636594 X-HE-Meta: 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 B4tSuSQ7 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 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 14:17, 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. -- Cheers, David / dhildenb