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[149.14.88.26]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-426ce5cfe4esm27898783f8f.26.2025.10.15.05.16.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Oct 2025 05:16:54 -0700 (PDT) Message-ID: Date: Wed, 15 Oct 2025 14:16:53 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] mm: call back alloc_pages_bulk_list since it is useful To: "zhaoyang.huang" , Andrew Morton , Matthew Wilcox , Mel Gorman , Vlastimil Babka , Sumit Semwal , Benjamin Gaignard , Brian Starkey , John Stultz , "T . J . Mercier" , =?UTF-8?Q?Christian_K=C3=B6nig?= , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Zhaoyang Huang , steve.kang@unisoc.com References: <20251014083230.1181072-1-zhaoyang.huang@unisoc.com> <20251014083230.1181072-2-zhaoyang.huang@unisoc.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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20251014083230.1181072-2-zhaoyang.huang@unisoc.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: Ff9WLumm8cYXmUnjbKI_xdUxpdfexMz3xCDiEzHUTJg_1760530616 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: fsi4umn9cxrmecdsqw5ukeu5uz7uwbz1 X-Rspamd-Queue-Id: EBEDB40006 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1760530618-295848 X-HE-Meta: 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 9hCmsm76 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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 14.10.25 10:32, zhaoyang.huang wrote: > From: Zhaoyang Huang Probably the subject should be "mm: reintroduce alloc_pages_bulk_list()" > > commit c8b979530f27 ("mm: alloc_pages_bulk_noprof: drop page_list > argument") drops alloc_pages_bulk_list. This commit would like to call back > it since it is proved to be helpful to the drivers which allocate a bulk of > pages(see patch of 2 in this series ). "Let's reintroduce it so we can us for bulk allocation in the context of XXX next." > I do notice that Matthew's comment of the time cost of iterating a list. > However, I also observed in our test that the extra page_array's allocation > could be more expensive than cpu iteration when direct reclaiming happens > when ram is low[1]. IMHO, could we leave the API here to have the users > choose between the array or list according to their scenarios. I'd prefer if we avoid reintroducing this interface. How many pages are you intending to allocate? Wouldn't a smaller array on the stack be sufficient? -- Cheers David / dhildenb