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[2003:cb:c738:3100:8133:26cf:7877:94aa]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436e2dc08bbsm207765915e9.12.2025.01.14.05.11.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Jan 2025 05:11:58 -0800 (PST) Message-ID: <059fcb77-7eea-4e3d-9b70-d88975388d9b@redhat.com> Date: Tue, 14 Jan 2025 14:11:58 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/4] selftests/mm: virtual_address_range: Unmap chunks after validation To: =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= , Andrew Morton , Shuah Khan , Dev Jain , Thomas Gleixner Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250113-virtual_address_range-tests-v3-0-f4a8e6b7feed@linutronix.de> <20250113-virtual_address_range-tests-v3-2-f4a8e6b7feed@linutronix.de> 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: <20250113-virtual_address_range-tests-v3-2-f4a8e6b7feed@linutronix.de> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 6Nobhc4Twy8iRV-DivktkkrGcAsCJWLlCzL-9-6jQZo_1736860320 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Stat-Signature: 66m6wgm5x7rzo7rzwy9zqk3fhydczpn6 X-Rspamd-Queue-Id: C40B940014 X-Rspam-User: X-HE-Tag: 1736860322-556306 X-HE-Meta: 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 QWE4++xo 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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 13.01.25 14:15, Thomas Weißschuh wrote: > For each accessed chunk a PTE is created. > More than 1GiB of PTEs is used in this way. > Remove each PTE after validating a chunk to reduce peak memory usage. > > It is important to only unmap memory that previously mmap()ed, > as unmapping other mappings like the stack, heap or executable mappings > will crash the process. > The mappings read from /proc/self/maps and the return values from mmap() > don't allow a simple correlation due to merging and no guaranteed order. > To correlate the pointers and mappings use prctl(PR_SET_VMA_ANON_NAME). > While it introduces a test dependency, other alternatives would > introduce runtime or development overhead. > > Fixes: 010409649885 ("selftests/mm: confirm VA exhaustion without reliance on correctness of mmap()") > Signed-off-by: Thomas Weißschuh > --- Acked-by: David Hildenbrand -- Cheers, David / dhildenb