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(p200300d82f07dd00ca9c199ed2b69099.dip0.t-ipconnect.de. [2003:d8:2f07:dd00:ca9c:199e:d2b6:9099]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3ee0fc00a92sm3283894f8f.63.2025.09.18.04.31.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 18 Sep 2025 04:31:11 -0700 (PDT) Message-ID: Date: Thu, 18 Sep 2025 13:31:09 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] mm/rmap: Improve mlock tracking for large folios To: kirill@shutemov.name, Andrew Morton , Hugh Dickins , Matthew Wilcox Cc: Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Rik van Riel , Harry Yoo , Johannes Weiner , Shakeel Butt , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Kiryl Shutsemau References: <20250918112157.410172-1-kirill@shutemov.name> <20250918112157.410172-3-kirill@shutemov.name> 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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20250918112157.410172-3-kirill@shutemov.name> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: JdxGvXilIRDFARTuoS__LsikFq6q1_N7DG4evr3vkao_1758195072 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: uncntaggxpqq51kidppf959ef6yctax6 X-Rspam-User: X-Rspamd-Queue-Id: 0551EA000A X-Rspamd-Server: rspam10 X-HE-Tag: 1758195076-371859 X-HE-Meta: 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 gunqmwof Fcl9QZW2xcodw1tNkXPugKWH0AJ63aAyGoJJhiHJrNx5mxmo= 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 18.09.25 13:21, kirill@shutemov.name wrote: > From: Kiryl Shutsemau > > The kernel currently does not mlock large folios when adding them to > rmap, stating that it is difficult to confirm that the folio is fully > mapped and safe to mlock it. However, nowadays the caller passes a > number of pages of the folio that are getting mapped, making it easy to > check if the entire folio is mapped to the VMA. > > mlock the folio on rmap if it is fully mapped to the VMA. > > Signed-off-by: Kiryl Shutsemau > --- Acked-by: David Hildenbrand -- Cheers David / dhildenb