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(p200300cbc70dfb00d3ed5f441b2d12af.dip0.t-ipconnect.de. [2003:cb:c70d:fb00:d3ed:5f44:1b2d:12af]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-439948eb34esm22389965e9.38.2025.02.18.08.17.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Feb 2025 08:17:22 -0800 (PST) Message-ID: <90a00957-02b5-440a-9168-de93c760fea7@redhat.com> Date: Tue, 18 Feb 2025 17:17:20 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/4] mm: allow guard regions in file-backed and read-only mappings To: Lorenzo Stoakes Cc: Andrew Morton , Suren Baghdasaryan , "Liam R . Howlett" , Matthew Wilcox , Vlastimil Babka , "Paul E . McKenney" , Jann Horn , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Shuah Khan , linux-kselftest@vger.kernel.org, linux-api@vger.kernel.org, John Hubbard , Juan Yescas , Kalesh Singh References: <6500a93f-aad1-4b21-a94e-feb493c344a3@redhat.com> <4d6d2942-10a1-46e8-93a6-7ce52b6af3ad@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: <4d6d2942-10a1-46e8-93a6-7ce52b6af3ad@lucifer.local> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: C9gXYqV7nqic6yIqMdpECRHGNlokZUXUc6FEbaAiDsk_1739895445 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 9FDC84001C X-Stat-Signature: hrbdpq138asd3ea4eac6ow6a9n1nbara X-HE-Tag: 1739895447-809557 X-HE-Meta: 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 tauVlwxw Uow1B4a2NEJc9jOh/VStcPJG7r+PsdssH6xvWnzOb2w5YKWbkoPEHKc/AS1iZ933MGItU1b2uXIL0P3Ua07BJet02rA+ImCDR22/76Bb3RMxKbWbEPNTV9nOXUx3NU+91Y8iqFfrENJlD43VNirgOfLzbMrQM28JpHkExfIhJtrW5bCF2MQhOJyxAE5OSHwz4jhOU+ezo/iR7S1L+lV7dyqkiugd/tdiLsPjuOucTAZn2bA3XyFiDMI2d4DcsDhnU84kiP+vvzYs6yr7sjSsxoB8vgR0kvaol/1FGllUfN5ckzH3bboPHuMgMC7AwQ0S3SvQK7Lt8jfYO6Zs0tntqwfDeZ99rFEIX6KA1rV3HOI/DuN7Edy/n+pJn5k4+2N/EHZKPnFM21HwqaaWX+5b5APj8hBs4ueqdLetafa1l01kvftgA4yctCdtNO4Hoqyf4tC62paGslX1qLtDN8/pV4RQ4utdSYNVyJlVIy7JywyWbZnhHGju7gfmNHkpi92I8d0On3KfYx/GRJphivcjLqSmskuJO4PNpkdhn 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 18.02.25 17:12, Lorenzo Stoakes wrote: > On Tue, Feb 18, 2025 at 05:01:16PM +0100, David Hildenbrand wrote: >> On 13.02.25 19:17, Lorenzo Stoakes wrote: >>> There is no reason to disallow guard regions in file-backed mappings - >>> readahead and fault-around both function correctly in the presence of PTE >>> markers, equally other operations relating to memory-mapped files function >>> correctly. >>> >>> Additionally, read-only mappings if introducing guard-regions, only >>> restrict the mapping further, which means there is no violation of any >>> access rights by permitting this to be so. >>> >>> Removing this restriction allows for read-only mapped files (such as >>> executable files) correctly which would otherwise not be permitted. >>> >>> Signed-off-by: Lorenzo Stoakes >>> --- >>> mm/madvise.c | 8 +------- >>> 1 file changed, 1 insertion(+), 7 deletions(-) >>> >>> diff --git a/mm/madvise.c b/mm/madvise.c >>> index 6ecead476a80..e01e93e179a8 100644 >>> --- a/mm/madvise.c >>> +++ b/mm/madvise.c >>> @@ -1051,13 +1051,7 @@ static bool is_valid_guard_vma(struct vm_area_struct *vma, bool allow_locked) >>> if (!allow_locked) >>> disallowed |= VM_LOCKED; >>> - if (!vma_is_anonymous(vma)) >>> - return false; >>> - >>> - if ((vma->vm_flags & (VM_MAYWRITE | disallowed)) != VM_MAYWRITE) >>> - return false; >>> - >>> - return true; >>> + return !(vma->vm_flags & disallowed); >>> } >>> static bool is_guard_pte_marker(pte_t ptent) >> >> Acked-by: David Hildenbrand > > Thanks! > >> >> I assume these markers cannot completely prevent us from allocating >> pages/folios for these underlying file/pageache ranges of these markers in >> case of shmem during page faults, right? > > If the markers are in place, then page faulting will result in a > segfault. If we faulted in a shmem page then installed markers (which would > zap the range), then the page cache will be populated, but obviously > subject to standard reclaim. Well, yes, (a) if there is swap and (b), if the noswap option was not specified for tmpfs. Okay, so installing a guard entry might require punshing a hole to get rid of any already-existing memory. But readahead (below) might mess it up. > > If we perform synchronous readahead prior to a guard region that includes > (partially or fully) a guard region we might major fault entries into the > page cache that are then not accessable _from that mapping_, this is rather > unavoidable as this doesn't account for page table mappings and should be > largely trivial overhead (also these folios are reclaimable). Right, that's what I had in mind: assume I have a single marker in a PMD, shmem might allocate a PMD THP to back that region, ignoring the marker hint. (so I think) Thanks! -- Cheers, David / dhildenb