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[149.14.88.26]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-33b61a3cc5csm18897294a91.10.2025.10.15.01.49.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Oct 2025 01:50:01 -0700 (PDT) Message-ID: <8c2c9721-e2ca-488b-b7be-c58170f6ceba@redhat.com> Date: Wed, 15 Oct 2025 10:49:48 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: selftests/mm/rmap: verify correct RMAP handling of COW pages after fork() To: Itamar Dalal , "linux-mm@kvack.org" , "linux-kselftest@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "akpm@linux-foundation.org" , "lorenzo.stoakes@oracle.com" , "riel@surriel.com" , "Liam.Howlett@oracle.com" , "vbabka@suse.cz" , "harry.yoo@oracle.com" , "jannh@google.com" , "rppt@kernel.org" , "surenb@google.com" , "mhocko@suse.com" , "shuah@kernel.org" References: 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: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: NeRD084Ref_PGvCXe77HceOLwoPLsZcRrk_1aXw2y8E_1760518202 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Stat-Signature: qm4ky1rcwbtq4y6pxms8xpnungstwp6z X-Rspamd-Queue-Id: 0D98A4000A X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1760518206-427009 X-HE-Meta: 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 d7Yl3UVW 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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 15.10.25 10:43, Itamar Dalal wrote: > Add a new test `migrate.cow_after_fork` that verifies correct RMAP handling > of Copy-On-Write (COW) pages after fork(). > > Before a write, the parent and child share the same PFN. After a write, the > child’s PFN differs. This confirms that proper COW duplication occurred and > that RMAP correctly tracks page ownership transitions during COW events. > > Signed-off-by: Itamar-Dalal > --- Se my reply to your other patch. For the next time a) Use git-format-patch that will automatically add [PATCH] b) Use versioning, e.g., [PATCH v1], explain changes since the last version under the "---" the c) Use RESEND for resends, e.g., [PATCH v1 RESEND] d) Use git-send-email to send mails out The b4 tool might help as well. -- Cheers David / dhildenb