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[2003:cb:c725:e600:4063:2059:fd18:9d65]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4248191116fsm18800235e9.37.2024.06.21.01.52.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 Jun 2024 01:52:04 -0700 (PDT) Message-ID: Date: Fri, 21 Jun 2024 10:52:03 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] selftests/mm: Introduce a test program to assess swap entry allocation for thp_swapout To: Ryan Roberts , Barry Song <21cnbao@gmail.com>, akpm@linux-foundation.org, shuah@kernel.org, linux-mm@kvack.org Cc: chrisl@kernel.org, hughd@google.com, kaleshsingh@google.com, kasong@tencent.com, linux-kernel@vger.kernel.org, ying.huang@intel.com, linux-kselftest@vger.kernel.org, Barry Song References: <20240620002648.75204-1-21cnbao@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-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 771BD40009 X-Stat-Signature: 47qbup1ercmffby61z5sxs1bzxwx8cm7 X-Rspam-User: X-HE-Tag: 1718959929-806935 X-HE-Meta: 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 3hme8B0a senui3hMDaUcooIymUR15GRVl66KJclAOCr2Xhvsx3trs/cdGIu9Uq9vwG8pIeXLfUbtiw9YzQOeZPfaK5Nyuo+fl4EG96giBZgx3gkIvQUPieKY78uM+Dq/E4qCv1UQ463iyUa8cT7/E4T+Ndb+F1XVeEidcNfzHgJDHtaoKI6wRnYSNICtG6ZChYSxx0+Yo6YMygqlWWhu52aKtCmQA5JpL4pFuttGUJno+H2oUAhe0G2BXKE44fnZM/bojemg2F43FhP6RAXD59IzPBEF4HLCoY3zPuyaIbjAJMyPF2sB7UTGKbHIWpLpF+L0TxVlN2P6KSb6Ur5JgznPCengU27lN5hcHvGE9UzOdv43PsBDSJWZuaaJz578JplHgJC4249bnHZQ48sCIM4BfKIGzE21BIjOq4g7fTyQwNpKKlS3b84p0QLulxe8qDfh/0LROx9GxD9efzz9Gjhe/NEh+zyfBwMTd9Es/s/9T 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 21.06.24 09:25, Ryan Roberts wrote: > On 20/06/2024 12:34, David Hildenbrand wrote: >> On 20.06.24 11:04, Ryan Roberts wrote: >>> On 20/06/2024 01:26, Barry Song wrote: >>>> From: Barry Song >>>> >>>> Both Ryan and Chris have been utilizing the small test program to aid >>>> in debugging and identifying issues with swap entry allocation. While >>>> a real or intricate workload might be more suitable for assessing the >>>> correctness and effectiveness of the swap allocation policy, a small >>>> test program presents a simpler means of understanding the problem and >>>> initially verifying the improvements being made. >>>> >>>> Let's endeavor to integrate it into the self-test suite. Although it >>>> presently only accommodates 64KB and 4KB, I'm optimistic that we can >>>> expand its capabilities to support multiple sizes and simulate more >>>> complex systems in the future as required. >>> >>> I'll try to summarize the thread with Huang Ying by suggesting this test program >>> is "neccessary but not sufficient" to exhaustively test the mTHP swap-out path. >>> I've certainly found it useful and think it would be a valuable addition to the >>> tree. >>> >>> That said, I'm not convinced it is a selftest; IMO a selftest should provide a >>> clear pass/fail result against some criteria and must be able to be run >>> automatically by (e.g.) a CI system. >> >> Likely we should then consider moving other such performance-related thingies >> out of the selftests? > > Yes, that would get my vote. But of the 4 tests you mentioned that use > clock_gettime(), it looks like transhuge-stress is the only one that doesn't > have a pass/fail result, so is probably the only candidate for moving. > > The others either use the times as a timeout and determines failure if the > action didn't occur within the timeout (e.g. ksm_tests.c) or use it to add some > supplemental performance information to an otherwise functionality-oriented test. Likely for ksm it would make sense to move the really functional parts to ksm_function_tests.c. Fur gup_test it might be similar. -- Cheers, David / dhildenb