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[2003:cb:c71a:5900:d106:4706:528a:7cd5]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39d8937f0d8sm4862357f8f.40.2025.04.10.07.25.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 10 Apr 2025 07:25:31 -0700 (PDT) Message-ID: Date: Thu, 10 Apr 2025 16:25:30 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] drivers/base/memory: Avoid overhead from for_each_present_section_nr() To: Oscar Salvador Cc: Gavin Shan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, adityag@linux.ibm.com, donettom@linux.ibm.com, gregkh@linuxfoundation.org, rafael@kernel.org, dakr@kernel.org, akpm@linux-foundation.org, shan.gavin@gmail.com References: <20250410125110.1232329-1-gshan@redhat.com> <9deb3725-8991-43d1-8c3d-56523fabff28@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-MFC-PROC-ID: 2YkVlB8mTjMdKlFCUaMEr_ht6QUhyAkFDJlHvQPuV0k_1744295132 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-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 73A86A0017 X-Stat-Signature: eos95r34bzdzr36wcbcysg9dwg5sabas X-HE-Tag: 1744295135-518651 X-HE-Meta: U2FsdGVkX19ZV0tEqbnctOUS4RnjH+ESeDmvoEDMHHLS0g5Ed1bjY5k0xyyUh9dBFrTTk8n+kVPRt7giAcEZUYyEFBrK6SMxAzHQ/3e1yVXppxrDx5AT5L1Mxy4H2LPHKU0J6HAg0OUUrSXjthHo3aNjAyGM225sXXubCADDHcKzRHTVLDhES3Oc6+2/pxn6+Rg37eOJLjXBN27JPxk6J4JbTd3Hj5WgbAVtyVe4+TUNQtBY9Jw828ZPw4HHDCyB4RqREnHvZ31oBnXQRoRqU50lzSrUmoz4UFoVjCyHCdTvCceT5vNS+3iIWPUD55DS5DSU8gRaIUqLDYXIecCRS7ADfEzdPySc73uXn8PG1WJXJRv+Ag8Rc9d7zLXV9e8j0vjERvx/rCcgqsh+13eYAwjVsec+pScsHm1aZaqTRZ4hCYm0O/iIok6ZQJcCfF5UiWPlEAyI+C4VMZG+52nU9J+eBRrP+JqSjPNuaxLKn4x5j7rLnLb7tf1IfuMKcMdV/M4NeWlCmpHVv8C0mwyHxbVMf6xdHfS8DUw/2MA4Vb+z2YchzoLE6vD6huVJaoXRzWMK2TQjEmA5vPGaibZDMNcNUUkXYhzWfMSQdgx5N2jD5jLlajjaOTUL1ZIp3i+U5l96SArV7+IVYQJHuxuI0R4XlPhu5miWx7lelyZNkVibOXp/qepg8WXeV0ZlLmumQtl1siUGqqQNTtsjEhAyjD40hqkSZuCMhQ01Xlot9XVojvoRjKnTj+6z/67d1oOVsrG952onIBLM1TgrB4l+YfQlguOGgGIMQ9nR7R/xfolGw0BpVBvP1fpTqgJxG2vU7mN90JRI9hnOgc314cfYqG+lNPrFb/9kN2aK7rnak4evBYWbGI1Czf+FlZyuBURcV1d7P0momMYosU1SFZrTITgenLgrGvLpbu7ujfycVbUYNy+nkTOPdTnAlipHUztXS0kcEJ9D6IQX2VoVu9E KqSPmh2a 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.005820, 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 10.04.25 16:12, Oscar Salvador wrote: > On Thu, Apr 10, 2025 at 03:55:19PM +0200, Oscar Salvador wrote: >> All in all, I think we are better, and the code is slightly simpler? > > One thing to notice is that maybe we could further improve and leap 'nr' > by the number of sections_per_block, so in those scenarios where > a memory-block spans multiple sections this could be faster? Essentially, when we created a block we could always start with the next section that starts after the block. -- Cheers, David / dhildenb