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[2003:cb:c741:c700:3db9:94c9:28b0:34f2]) by smtp.gmail.com with ESMTPSA id u7-20020a50d507000000b0056be85c253fsm4470920edi.95.2024.03.26.09.35.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 26 Mar 2024 09:35:12 -0700 (PDT) Message-ID: <820c6ec7-8050-4518-a76a-ef707d76316f@redhat.com> Date: Tue, 26 Mar 2024 17:35:11 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v1 4/4] arm64/mm: Override ptep_get_lockless_norecency() To: Ryan Roberts , Mark Rutland , Catalin Marinas , Will Deacon , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Andrew Morton , Muchun Song Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20240215121756.2734131-1-ryan.roberts@arm.com> <20240215121756.2734131-5-ryan.roberts@arm.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: <20240215121756.2734131-5-ryan.roberts@arm.com> 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: rspam09 X-Rspamd-Queue-Id: 20DE020026 X-Stat-Signature: dwj1n6zfbfu6dagxj5fhfoxmdi9w4y7j X-Rspam-User: X-HE-Tag: 1711470916-370000 X-HE-Meta: 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 6ZID0OA1 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 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 15.02.24 13:17, Ryan Roberts wrote: > Override ptep_get_lockless_norecency() when CONFIG_ARM64_CONTPTE is > enabled. Because this API doesn't require the access and dirty bits to > be accurate, for the contpte case, we can avoid reading all ptes in the > contpte block to collect those bits, in contrast to ptep_get_lockless(). > > Signed-off-by: Ryan Roberts > --- > arch/arm64/include/asm/pgtable.h | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h > index 401087e8a43d..c0e4ccf74714 100644 > --- a/arch/arm64/include/asm/pgtable.h > +++ b/arch/arm64/include/asm/pgtable.h > @@ -1287,6 +1287,12 @@ static inline pte_t ptep_get_lockless(pte_t *ptep) > return contpte_ptep_get_lockless(ptep); > } > > +#define ptep_get_lockless_norecency ptep_get_lockless_norecency > +static inline pte_t ptep_get_lockless_norecency(pte_t *ptep) > +{ > + return __ptep_get(ptep); > +} > + > static inline void set_pte(pte_t *ptep, pte_t pte) > { > /* > -- > 2.25.1 > Reviewed-by: David Hildenbrand -- Cheers, David / dhildenb