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[2003:cb:c731:3d00:918f:ce94:4280:80f0]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-35dd0667366sm8134698f8f.111.2024.06.03.02.03.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 03 Jun 2024 02:03:56 -0700 (PDT) Message-ID: Date: Mon, 3 Jun 2024 11:03:55 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/1] mm/mlock: implement folio_mlock_step() using folio_pte_batch() To: Baolin Wang , Barry Song <21cnbao@gmail.com>, Lance Yang Cc: akpm@linux-foundation.org, ryan.roberts@arm.com, ziy@nvidia.com, fengwei.yin@intel.com, ying.huang@intel.com, libang.li@antgroup.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20240603033118.76457-1-ioworker0@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: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: E2C9C1C0023 X-Stat-Signature: cfxm9mk16gifcrf9s4d9scq8kre4qfdk X-HE-Tag: 1717405442-172374 X-HE-Meta: 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 z/HHX/ew 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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 03.06.24 10:58, Baolin Wang wrote: > > > On 2024/6/3 12:14, Barry Song wrote: >> On Mon, Jun 3, 2024 at 3:31 PM Lance Yang wrote: >>> >>> Let's make folio_mlock_step() simply a wrapper around folio_pte_batch(), >>> which will greatly reduce the cost of ptep_get() when scanning a range of >>> contptes. >>> >>> Signed-off-by: Lance Yang >>> --- >>> mm/mlock.c | 23 ++++++----------------- >>> 1 file changed, 6 insertions(+), 17 deletions(-) >>> >>> diff --git a/mm/mlock.c b/mm/mlock.c >>> index 30b51cdea89d..1ae6232d38cf 100644 >>> --- a/mm/mlock.c >>> +++ b/mm/mlock.c >>> @@ -307,26 +307,15 @@ void munlock_folio(struct folio *folio) >>> static inline unsigned int folio_mlock_step(struct folio *folio, >>> pte_t *pte, unsigned long addr, unsigned long end) >>> { >>> - unsigned int count, i, nr = folio_nr_pages(folio); >>> - unsigned long pfn = folio_pfn(folio); >>> - pte_t ptent = ptep_get(pte); >>> - >>> - if (!folio_test_large(folio)) >>> + if (likely(!folio_test_large(folio))) >>> return 1; >>> >>> - count = pfn + nr - pte_pfn(ptent); >>> - count = min_t(unsigned int, count, (end - addr) >> PAGE_SHIFT); >>> - >>> - for (i = 0; i < count; i++, pte++) { >>> - pte_t entry = ptep_get(pte); >>> - >>> - if (!pte_present(entry)) >>> - break; >>> - if (pte_pfn(entry) - pfn >= nr) >>> - break; >>> - } >>> + const fpb_t fpb_flags = FPB_IGNORE_DIRTY | FPB_IGNORE_SOFT_DIRTY; >>> + int max_nr = (end - addr) / PAGE_SIZE; >>> + pte_t ptent = ptep_get(pte); >>> >>> - return i; >>> + return folio_pte_batch(folio, addr, pte, ptent, max_nr, fpb_flags, NULL, >>> + NULL, NULL); >>> } >> >> what about a minimum change as below? >> index 30b51cdea89d..e8b98f84fbd2 100644 >> --- a/mm/mlock.c >> +++ b/mm/mlock.c >> @@ -307,26 +307,15 @@ void munlock_folio(struct folio *folio) >> static inline unsigned int folio_mlock_step(struct folio *folio, >> pte_t *pte, unsigned long addr, unsigned long end) >> { >> - unsigned int count, i, nr = folio_nr_pages(folio); >> - unsigned long pfn = folio_pfn(folio); >> + unsigned int count = (end - addr) >> PAGE_SHIFT; >> pte_t ptent = ptep_get(pte); >> + const fpb_t fpb_flags = FPB_IGNORE_DIRTY | FPB_IGNORE_SOFT_DIRTY; >> >> if (!folio_test_large(folio)) >> return 1; >> >> - count = pfn + nr - pte_pfn(ptent); >> - count = min_t(unsigned int, count, (end - addr) >> PAGE_SHIFT); >> - >> - for (i = 0; i < count; i++, pte++) { >> - pte_t entry = ptep_get(pte); >> - >> - if (!pte_present(entry)) >> - break; >> - if (pte_pfn(entry) - pfn >= nr) >> - break; >> - } >> - >> - return i; >> + return folio_pte_batch(folio, addr, pte, ptent, count, fpb_flags, NULL, >> + NULL, NULL); >> } > > LGTM. > Reviewed-by: Baolin Wang > Acked-by: David Hildenbrand -- Cheers, David / dhildenb