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[2003:d8:2f28:7c00:a95e:ac49:f2ad:ab84]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-447f6b29619sm36408515e9.7.2025.05.20.07.56.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 20 May 2025 07:56:44 -0700 (PDT) Message-ID: Date: Tue, 20 May 2025 16:56:43 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v2 0/5] mm, bpf: BPF based THP adjustment To: Matthew Wilcox , Lorenzo Stoakes Cc: Usama Arif , Yafang Shao , Nico Pache , akpm@linux-foundation.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, dev.jain@arm.com, hannes@cmpxchg.org, gutierrez.asier@huawei-partners.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, bpf@vger.kernel.org, linux-mm@kvack.org References: <20250520060504.20251-1-laoar.shao@gmail.com> <2345b8b9-b084-4661-8b55-61fd7fc7de57@lucifer.local> <82f7bca5-384f-41e5-a0fc-0e1e8e260607@gmail.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: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: GdLZmZ1JC4z5lHN0-po6p8l2ZtKRKDrMp58YtF9Lo0s_1747753005 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 208B440003 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: eto9uz891ckwuc63ojitp3cg43sapz44 X-HE-Tag: 1747753007-13946 X-HE-Meta: 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 tAyf3bwG B6XDio1pn5hAhHjrtwBAhWQtbRg/s2sAgb4Y0CZ8gvQ6xDGd2EGYqYHLB09qdiD4YgKLYm0/GmWksUKBAemYps2rue1H9nOixXsbZKLnn7+dVb6EzYA7Gzi5ZR6fkH0RvZ+8V5bKqX6mG7i/3MA8iU4V6w2FQ26DCAwr5oyxZt62Au/f/Q83tXbdngtDg5bFlgMbADCXJC3Gjz+ReOgSkBiYdiObCMGvhfuLfYb+itf9/LEqdrdoRqeHVIlqWQNagskZjpnnwVpIsir+hd5uqebCsoCH7Zaq6irzTJ3GORopCW0XTfrczizrrQAeDt2AGF4dseY6TOyMN/MIn77oTlFR/4W74TuvNueCAfE6Cu0JLQnHZsNRJVdq688XmCQW3fh1k9eRb3Un3Cso9U7SMkGtyaIPtBYDS9V9O6zwTytx0ZbP1Qd8JrQQRJZidShSrRcLu/XwoDOfA7wO5MtGeRERB/XKIMPeTmDV2 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 16:42, Matthew Wilcox wrote: > On Tue, May 20, 2025 at 03:35:49PM +0100, Lorenzo Stoakes wrote: >> I agree global settings are not fine-grained enough, but 'sys admins refuse >> to do X so we want to ignore what they do' is... really not right at all. > > Oh, we do that all the time, Leave the interface around but document > it's now a no-op. For example, file-backed memory ignores the THP > settings completely. IIRC, it never honored it. Like shmem it also never honored it an instead used it's own toggle (not sure what to think about that ...). -- Cheers, David / dhildenb