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Peter Anvin" , linux-arm-kernel@lists.infradead.org, x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20240202080756.1453939-1-ryan.roberts@arm.com> <20240202080756.1453939-20-ryan.roberts@arm.com> <502a3ea7-fd86-4314-8292-c7999eda92eb@arm.com> <427ba87a-7dd0-4f3e-861f-fe6946b7cd97@redhat.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-Rspam-User: X-Stat-Signature: kfc3xe45xnq6z3hiwiu61o3gshbuekc4 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 3CE9E1A000E X-HE-Tag: 1707755061-238362 X-HE-Meta: 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 u6cUmUBm WvJqYv/2cikxutdriogKXyIttsvHi02TX5Cc3EeV0pI/GIsCmPGJFTZCeIjPCFBGNkSWTWsks8O91KHdWn/pau7YLPXCIiSHroYPQeYeV8xPheDoy/+GpbmHGbBz97Q50fu82iLZei19xb84foRkk3TW01a4ih43dgRKYordw2MSuq2clAyqst9F9GoQbon7sCcyWmRzMzLUnN31D4uVke16CopTB7uxmXKBFDtHgYlIM3xQWuReg2XU5GRmfnFUShuERIq24CHWczyvmM4tEMGFLVeUqqtLsUmbG 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 12.02.24 16:34, Ryan Roberts wrote: > On 12/02/2024 15:26, David Hildenbrand wrote: >> On 12.02.24 15:45, Ryan Roberts wrote: >>> On 12/02/2024 13:54, David Hildenbrand wrote: >>>>>> If so, I wonder if we could instead do that comparison modulo the access/dirty >>>>>> bits, >>>>> >>>>> I think that would work - but will need to think a bit more on it. >>>>> >>>>>> and leave ptep_get_lockless() only reading a single entry? >>>>> >>>>> I think we will need to do something a bit less fragile. ptep_get() does >>>>> collect >>>>> the access/dirty bits so its confusing if ptep_get_lockless() doesn't IMHO. So >>>>> we will likely want to rename the function and make its documentation explicit >>>>> that it does not return those bits. >>>>> >>>>> ptep_get_lockless_noyoungdirty()? yuk... Any ideas? >>>>> >>>>> Of course if I could convince you the current implementation is safe, I >>>>> might be >>>>> able to sidestep this optimization until a later date? >>>> >>>> As discussed (and pointed out abive), there might be quite some callsites where >>>> we don't really care about uptodate accessed/dirty bits -- where ptep_get() is >>>> used nowadays. >>>> >>>> One way to approach that I had in mind was having an explicit interface: >>>> >>>> ptep_get() >>>> ptep_get_uptodate() >>>> ptep_get_lockless() >>>> ptep_get_lockless_uptodate() >>> >>> Yes, I like the direction of this. I guess we anticipate that call sites >>> requiring the "_uptodate" variant will be the minority so it makes sense to use >>> the current names for the "_not_uptodate" variants? But to do a slow migration, >>> it might be better/safer to have the weaker variant use the new name - that >>> would allow us to downgrade one at a time? >> >> Yes, I was primarily struggling with names. Likely it makes sense to either have >> two completely new function names, or use the new name only for the "faster but >> less precise" variant. >> >>> >>>> >>>> Especially the last one might not be needed. >>> I've done a scan through the code and agree with Mark's original conclusions. >>> Additionally, huge_pte_alloc() (which isn't used for arm64) doesn't rely on >>> access/dirty info. So I think I could migrate everything to the weaker variant >>> fairly easily. >>> >>>> >>>> Futher, "uptodate" might not be the best choice because of PageUptodate() and >>>> friends. But it's better than "youngdirty"/"noyoungdirty" IMHO. >>> >>> Certainly agree with "noyoungdirty" being a horrible name. How about "_sync" / >>> "_nosync"? >> >> I could live with >> >> ptep_get_sync() >> ptep_get_nosync() >> >> with proper documentation :) > > but could you live with: > > ptep_get() > ptep_get_nosync() > ptep_get_lockless_nosync() > > ? > > So leave the "slower, more precise" version with the existing name. Sure. -- Cheers, David / dhildenb