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[2003:cb:c709:d500:4044:6d4c:f060:f677]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42100fad638sm5786975e9.29.2024.05.22.14.43.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 May 2024 14:43:01 -0700 (PDT) Message-ID: <80ffb1f6-f4e2-4259-8af5-ef468c56f91a@redhat.com> Date: Wed, 22 May 2024 23:43:00 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [LSF/MM/BPF TOPIC]mTHP reliable allocation and reclamation To: Barry Song <21cnbao@gmail.com>, lsf-pc@lists.linux-foundation.org Cc: Linux-MM References: 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-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 23FD04000D X-Stat-Signature: opkmipytqojz9syg4idrq1uzafq4ixbz X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1716414187-503402 X-HE-Meta: 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 3tTOwos6 vHgnT1AYaiiWoH5kR4elnOkF/9fS5zQugVsu9ZOZeTSxwX0bgmPM/QTlIXsQ/+R2bDUZvL3ZEMEbuD7AdLtcrDdSc4yBhpJq9LS4ursnMKT4UrjfJYaVgniBnXyDMLJi3m+8JheflXLH7ys0yQtGdDvX4siaMcLSuyw7o X-Bogosity: Ham, tests=bogofilter, spamicity=0.000530, 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 10.05.24 04:22, Barry Song wrote: > Hi, > > I'd like to propose a session about the allocation and reclamation of > mTHP. This is related to Yu Zhao's > TAO[1] but not the same. > > OPPO has implemented mTHP-like large folios across thousands of > genuine Android devices, utilizing > ARM64 CONT-PTE. However, we've encountered challenges: > > - The allocation of mTHP isn't consistently reliable; even after > prolonged use, obtaining large folios > remains uncertain. > As an instance, following a few hours of operation, the likelihood > of successfully allocating large > folios on a phone may decrease to just 2%. > > - Mixing large and small folios in the same LRU list can lead to > mutual blocking and unpredictable > latency during reclamation/allocation. > > For instance, if you require large folios, the LRU list's tail could > be filled with small folios. > LRU(LF- large folio, SF- small folio): > > LF - LF - LF - SF - SF - SF - SF - SF - SF -SF - SF - SF - SF - SF - SF - SF As we see more and more large folio users, with folios of differing sizes, I do wonder if the problem will shift from an order-0 vs. order>0 to other orders. E.g., order-0 vs. order-4 vs. other orders. Meaning: small vs. large folios will long term not be the real issue (in some configurations it will remain that for sure). What's your take on that? -- Cheers, David / dhildenb