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[2003:d8:2f47:2b00:c5f3:4053:2918:d17c]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4587abeb39esm97528125e9.13.2025.07.28.06.08.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 28 Jul 2025 06:08:38 -0700 (PDT) Message-ID: <3e88642f-3914-42b0-b864-4ad374b659b5@redhat.com> Date: Mon, 28 Jul 2025 15:08:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC] Disable auto_movable_ratio for selfhosted memmap To: Michal Hocko , Hannes Reinecke 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: mJxEkRGKcfG9gPhfQXgOnGJHwt0VE0kaAS57UhnZ6_8_1753708447 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: 3C1A312000A X-Stat-Signature: qmcfwreswgm9zwzpa77wn1aituqdjfbc X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1753708450-284065 X-HE-Meta: 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 +jd/wqdj 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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 15:06, Michal Hocko wrote: > On Mon 28-07-25 11:37:46, Hannes Reinecke wrote: >> On 7/28/25 11:10, David Hildenbrand wrote: >> And to make matters worse, we have two competing user-space programs: >> - udev >> - daxctl >> neither of which is (or can be made) aware of each other. >> This leads to races and/or inconsistencies. > > Would it help if generic udev memory hotplug rule exclude anything that > is dax backed? Is there a way to check for that? Sorry if this is a > stupid question. Parsing /proc/iomem, it's indicated as "System RAM (kmem)". -- Cheers, David / dhildenb