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[2003:d8:2f4e:fd00:8e13:e3b5:90c8:1159]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4535e97abf6sm144353265e9.6.2025.06.23.06.59.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Jun 2025 06:59:08 -0700 (PDT) Message-ID: <924f82b1-0eb7-47e0-b7d4-5dd314df18a0@redhat.com> Date: Mon, 23 Jun 2025 15:59:07 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/2] mm: shmem: disallow hugepages if the system-wide shmem THP sysfs settings are disabled To: Baolin Wang , akpm@linux-foundation.org, hughd@google.com Cc: ziy@nvidia.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <52bc87c7dbd362d4d2b7780e66c1536fe99454a0.1750666536.git.baolin.wang@linux.alibaba.com> 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: <52bc87c7dbd362d4d2b7780e66c1536fe99454a0.1750666536.git.baolin.wang@linux.alibaba.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: Auu_AAUuTpypz0FUJaHiHN-bs4Jwcw0iIKY82Z7Bllw_1750687150 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 5B3FD140007 X-Stat-Signature: jqtrui8xryjqfutsiet4mzf9o91h8md6 X-HE-Tag: 1750687153-671040 X-HE-Meta: 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 iqg1EG05 UScW09sO8v2ACSpkIfZDLOSWnEuG/sEupZrt50HAZCroWCTAEIngRucDPNIbkWcQSILsavork+pxFKmV6sV/VyAjU0jGscZ8DVpw/WlW3mY+6J1/J4oCi9wvCUKV3XWjr0Ks/h/aepO68Um8J97537piQH1U8iju8M7t7a4vKv7RMsgQM0ZIb3vYbZ3iB4mulF6gFdRsmKGKvpa0koWKpONqNySUlltnNLZjHp4WfLmq96LyybRWxLhg6f8mdc0xlST3AB18NFYcp+lBtbrkAdAS76n61nA8QrOgTYex+x0t1cRLwejuwNZaLt5lTiNJza+ZGuHtDy8TrFu0MEfoSfYkxTqB50ozZ12YymFAdd563WciKxKGoqW/4Mv1/DwukOeqGOYRUx7uczDjunwk9TeJ/LOxXvZ9o0uw6NEFOfj0MI4c= 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 23.06.25 10:28, Baolin Wang wrote: > When invoking thp_vma_allowable_orders(), if the TVA_ENFORCE_SYSFS flag is not > specified, we will ignore the THP sysfs settings. And the MADV_COLLAPSE is an > example of such a case. > > The MADV_COLLAPSE will ignore the system-wide shmem THP sysfs settings, which > means that even though we have disabled the shmem THP configuration, MADV_COLLAPSE > will still attempt to collapse into a shmem THP. This violates the rule we have > agreed upon: never means never. > > Another rule for madvise, referring to David's suggestion: “allowing for collapsing > in a VM without VM_HUGEPAGE in the "madvise" mode would be fine". > > To fix the MADV_COLLAPSE issue for shmem, then the current strategy should be: > > For shmem, if none of always, madvise, within_size, and inherit have enabled > PMD-sized THP, then MADV_COLLAPSE will be prohibited from collapsing PMD-sized THP. I assume we could rephrase that to "For shmem, if "shmem_enabled" is set to either "none" or "deny", then MADV_COLLAPSE will be prohibited from collapsing." Or am I missing a case? [...] > @@ -672,7 +672,7 @@ static unsigned int shmem_huge_global_enabled(struct inode *inode, pgoff_t index > > fallthrough; > case SHMEM_HUGE_ADVISE: > - if (vm_flags & VM_HUGEPAGE) > + if (shmem_huge_force || (vm_flags & VM_HUGEPAGE)) > return maybe_pmd_order; > fallthrough; > default: > @@ -1806,7 +1806,7 @@ unsigned long shmem_allowable_huge_orders(struct inode *inode, > /* Allow mTHP that will be fully within i_size. */ > mask |= shmem_get_orders_within_size(inode, within_size_orders, index, 0); > > - if (vm_flags & VM_HUGEPAGE) > + if (shmem_huge_force || (vm_flags & VM_HUGEPAGE)) > mask |= READ_ONCE(huge_shmem_orders_madvise); > > if (global_orders > 0) > diff --git a/tools/testing/selftests/mm/khugepaged.c b/tools/testing/selftests/mm/khugepaged.c > index 85bfff53dba6..9517ed99c382 100644 > --- a/tools/testing/selftests/mm/khugepaged.c > +++ b/tools/testing/selftests/mm/khugepaged.c > @@ -502,7 +502,7 @@ static void __madvise_collapse(const char *msg, char *p, int nr_hpages, > printf("%s...", msg); > > settings.thp_enabled = THP_ALWAYS; > - settings.shmem_enabled = SHMEM_NEVER; > + settings.shmem_enabled = SHMEM_ALWAYS; > thp_push_settings(&settings); Same question as for the other case. -- Cheers, David / dhildenb