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[2003:d8:2f0d:f000:eec9:2b8d:4913:f32a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-450d7f92585sm187255925e9.5.2025.06.03.14.31.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Jun 2025 14:31:22 -0700 (PDT) Message-ID: Date: Tue, 3 Jun 2025 23:31:21 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC Patch 0/5] Make anon_vma operations testable To: Wei Yang Cc: Lorenzo Stoakes , akpm@linux-foundation.org, riel@surriel.com, vbabka@suse.cz, harry.yoo@oracle.com, jannh@google.com, baohua@kernel.org, linux-mm@kvack.org References: <20250429235608.yvbcxybkfsmp6ow5@master> <20250514012318.2impqotf65p4ihsc@master> <20250527063428.4ykrdtive2hfnqdp@master> <40dc48f9-94d7-46b0-83ed-d3511789c15a@redhat.com> <20250530021112.6b2ldosl3hvhcnvq@master> <20250530140521.tnyjxdsy6qa6dokl@master> <253705b2-a9bb-47a0-94e5-1aeafcca0396@redhat.com> <20250530232358.yjx4yqxicvsbvgjw@master> 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/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz 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+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20250530232358.yjx4yqxicvsbvgjw@master> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: Bj6-2jHD-SqiJm4buh7uETVdqyaYoWUuhszWvI0Cs5g_1748986283 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 937AB20010 X-Stat-Signature: bx14odyyuwrk6s37hcmn694beqs5suso X-Rspam-User: X-HE-Tag: 1748986286-130392 X-HE-Meta: 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 ylqTifDy 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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 31.05.25 01:23, Wei Yang wrote: > On Fri, May 30, 2025 at 04:39:21PM +0200, David Hildenbrand wrote: > [...] >>> >>> Here you mean for all anon/shmem/pagecache pages, we could have two category >>> tests: >>> >>> * migrate and write different data from on process, verify each process see >>> new data >>> * trigger pageout from one process, verify each process has it pageout >>> (/proc/self/pagemap) >>> >>> While one of these category is enough, right? Just like KSM below, migrate or >>> pageout. >> >> Both cases will trigger different code paths: for example, migration will >> trigger restoring of migration entries, which is a different rmap operation >> not triggered by pageout/pagein :) >> >> Pageout is probably easier to implement: but we couldn't test hugetlb. With >> migration we probably could also test hugetlb rmap code (yet another case we >> should probably cover). >> > > Oh, the pageout/pagein here is the madvise(MADV_PAGEOUT) one you mention in > your previous reply? Yes, migration (via move_pages(), but requiring two NUMA nodes) vs. pageout (via madvise(MADV_PAGEOUT) which would require a similar "force" way of succeeding on shared pages). -- Cheers, David / dhildenb