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[2003:cb:c743:de00:7030:120f:d1c9:4c3c]) by smtp.gmail.com with ESMTPSA id dr20-20020a5d5f94000000b0033ea499c645sm143263wrb.4.2024.04.04.12.33.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 04 Apr 2024 12:33:58 -0700 (PDT) Message-ID: <9b3c2d48-96f2-4d29-b2ba-a0f2ea47da45@redhat.com> Date: Thu, 4 Apr 2024 21:33:57 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [LSF/MM/BPF TOPIC] Multi-sized THP performance benchmarks and analysis on ARM64 To: "Christoph Lameter (Ampere)" , Jonathan Cameron Cc: Yang Shi , lsf-pc@lists.linux-foundation.org, olivier.singla@amperecomputing.com, Linux MM , Michal Hocko , Dan Williams References: <20240401191614.00007c83@Huawei.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-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: 3cn3astccwap4qob61oy94ucbg4ci64g X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: E434B100020 X-Rspam-User: X-HE-Tag: 1712259242-17392 X-HE-Meta: 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 MMJWZVIi d71LFYtlLfXOlBSQpKtEjrE5oC2PXl2781z7jGwE7+xByCjc+t+RRlzPWvz9+l/hKssI2M0popghEgk29+3FgCPDNdwNC4UX9sMavachz9FIw4MgP+fBcq3TUblRu9YgzSlzMc57AVYfjYZMqrHWLgL/syVj1LafS+YtejJMwR0YZVXa2i0QdtUrsDbHXpkcScvV4HiiSXwwrgc5gbFY44Tzb7K1qoUrYe2ywwmE4sgVzZKCwDGwp0mL7ubrBK+7hpSbO0ztX7pOl9k1f2elyjbSttQaNicf4+0maO3y4/Kpbe7T59UXnRLtqk42We/1uqyIOythp0dSZ8PtFjllZIN5BEJZbBG5ZCxPMgg5hwsc+JxIkmL+O+/Glefy0GPYcsB6IF4wDeIE9V37dY2ZZrNfoJF/SOz0upoMk X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, 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 04.04.24 20:57, Christoph Lameter (Ampere) wrote: > On Mon, 1 Apr 2024, Jonathan Cameron wrote: > >> Sounds like useful data, but is it a suitable topic for LSF-MM? >> What open questions etc is it raising? > > > mTHP is new functionality that will require additional work to support > more use cases. It is also unclear at this point in what usecases mTHP is > useful and where no benefit can so far be seen. Also the effect of > coalescing multiple PTE entries into one TLB entry is new to MM > (CONT_PTE). > > Ultimately it would be useful to have mTHP support also provide larger > blocksize capabilities for filesystem etc etc. mTHP needs to mature and an > analysis of the arguable a bit experimental state of affairs can help a > lot in getting there. Right, something like that (open items, missed use cases, requirements, ideas, etc,.) would be a better (good!) fit. Pure benchmark results, analysis and recommendations are great. But likely a better fit for a (white) paper, blog post, less-discussion-focused conference. -- Cheers, David / dhildenb