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[2003:cb:c706:f500:53dc:2395:6b94:fe8a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42bbe79f545sm14859925e9.2.2024.08.30.08.24.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 30 Aug 2024 08:24:12 -0700 (PDT) Message-ID: Date: Fri, 30 Aug 2024 17:24:10 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC] mm: mmap: Change DEFAULT_MAX_MAP_COUNT to INT_MAX To: Lorenzo Stoakes , Petr Spacek Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vlastimil Babka , Liam Howlett References: <20240830095636.572947-1-pspacek@isc.org> <90f07fec-3f46-4b38-86fd-07c9f8201904@lucifer.local> 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: <90f07fec-3f46-4b38-86fd-07c9f8201904@lucifer.local> X-Mimecast-Spam-Score: 0 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: B1291160006 X-Stat-Signature: nc8f9q9jd78bfh9jbsm6fec4hqeorspp X-Rspam-User: X-HE-Tag: 1725031456-90042 X-HE-Meta: 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 pRl706HX 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000626, 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 30.08.24 13:41, Lorenzo Stoakes wrote: > On Fri, Aug 30, 2024 at 11:56:36AM GMT, Petr Spacek wrote: >> From: Petr Spacek >> >> Raise default sysctl vm.max_map_count to INT_MAX, which effectively >> disables the limit for all sane purposes. The sysctl is kept around in >> case there is some use-case for this limit. >> >> The old default value of vm.max_map_count=65530 provided compatibility >> with ELF format predating year 2000 and with binutils predating 2010. At >> the same time the old default caused issues with applications deployed >> in 2024. >> >> State since 2012: Linux 3.2.0 correctly generates coredump from a >> process with 100 000 mmapped files. GDB 7.4.1, binutils 2.22 work with >> this coredump fine and can actually read data from the mmaped addresses. >> >> Signed-off-by: Petr Spacek > > NACK. Ageed, I could have sworn I NACKed a similar patch just months ago. If you use that many memory mappings, you re doing something very, very wrong. -- Cheers, David / dhildenb