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(p200300d82f287c00a95eac49f2adab84.dip0.t-ipconnect.de. [2003:d8:2f28:7c00:a95e:ac49:f2ad:ab84]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-447f6b295fdsm38705305e9.5.2025.05.20.09.35.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 20 May 2025 09:35:01 -0700 (PDT) Message-ID: Date: Tue, 20 May 2025 18:35:00 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 4/5] mm/madvise: add PMADV_SET_FORK_EXEC_DEFAULT process_madvise() flag To: Lorenzo Stoakes , Jann Horn Cc: Pedro Falcato , Andrew Morton , "Liam R . Howlett" , Vlastimil Babka , Arnd Bergmann , Christian Brauner , linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, SeongJae Park , Usama Arif References: <617413860ff194dfb1afedb175b2d84a457e449d.1747686021.git.lorenzo.stoakes@oracle.com> <24272ed3-0d16-412b-a7f4-78d02c347837@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: <24272ed3-0d16-412b-a7f4-78d02c347837@lucifer.local> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: vdAlWD3Xrd1xIOWttTxmgbTqs7dumz2DYo8Sza5XbY8_1747758902 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: uzefqkfq78ksn57hgn4zw6k6oofqj8yt X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 95F5240003 X-HE-Tag: 1747758905-615121 X-HE-Meta: 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 OP7PCVSi ueirXTW27iauNWbS+nz+tnWgKHkIb7eL9GTBlLv7Q/MjhaV5xsR9qJujO9BjiWg3tt1ejcWJt0DFy9MGINV4E8F7Y6+ldYTXMkTU+N0zQgyU5C8g2/1R3jJ0ZVKwrv0Tsr1Jcf8nhlrj4BcM99Xzi0gs3IE/OTcmzYCBUjgMULrbz1WaU+PfgANmbOVoMIUUh0/+mXx9S0m3LlUOFGDJUvCMgslkUogEQ3EqCwPPlxlNhOWM93fSxHmh7vyrqnq+XS5YqRHn8c62mCT8b1j+MGcfLL8MMDdyoA9OcVx9Ll94IlSB+Sh7eCQlqv5TSy4EaBx7aMZX6gWpm527Mx6sybVGbpAtdbsHkCymkIY4Z4/5x+hxiCWCu5ChCDS+VXrpuPk/rrDZVEcabbCnU6Ohj98rpHsyoF08/k5C0xIqylr94nwIwzBcNgXFXhHQ6JfN4N52K9zCj2TdEDwAvc8MG4TU85J4/pKpkSUda 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 20.05.25 18:19, Lorenzo Stoakes wrote: > On Tue, May 20, 2025 at 06:11:49PM +0200, Jann Horn wrote: >> On Tue, May 20, 2025 at 10:38 AM Pedro Falcato wrote: >>> - PMADV_INHERIT_FORK. This makes it so the flag is propagated to child processes (does not imply PMADV_FUTURE) >> >> Do we think there will be flags settable through this API that we >> explicitly _don't_ want to inherit on fork()? My understanding is that >> sort of the default for fork() is to inherit everything, and things >> that don't get inherited are weird special cases (like mlock() state). >> (While the default for execve() is to inherit nothing about the MM.) > > Yeah this is true. It is the exception rather than the rule... > >> >> (I guess you could make a case that in a fork+exec sequence, the child >> might not want to create hugepage between fork and exec... but this is >> probably not the right place to control that?) > > From my point of view it simply reads better :) > > But perhaps we can drop the fork bit and leave that implied. Yes, we should. Exec is where the "fun" begins. -- Cheers, David / dhildenb