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[2003:d8:2f44:3e00:9fca:7d89:a265:56f3]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b8fc28a7b0sm25886485f8f.63.2025.08.14.02.01.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Aug 2025 02:01:42 -0700 (PDT) Message-ID: <7e88d01a-10bb-4edb-9010-f9c0bca31a46@redhat.com> Date: Thu, 14 Aug 2025 11:01:40 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0 To: lirongqing , muchun.song@linux.dev, osalvador@suse.de, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20250814082950.2888-1-lirongqing@baidu.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: <20250814082950.2888-1-lirongqing@baidu.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: s0qLKSHqAM31rvPfnPPZsugzT8V1cQTTGkdBnFgA-U8_1755162103 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: rspam10 X-Rspamd-Queue-Id: 6571C8000F X-Stat-Signature: 4tt85x6h8xu6qynpgtfj7z1nmfhzehmb X-Rspam-User: X-HE-Tag: 1755162106-612192 X-HE-Meta: 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 R4QbX+LZ wpmtsgj6tLZf3TsxUwJanVxJmyAc9fIJkTQNt4DLCx2KQLAa27TbfogcBfpT95C/7Fm3PbMplIHwdEl3p0jahzJ0VDw== 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 14.08.25 10:29, lirongqing wrote: > From: Li RongQing > > Optimize hugetlb_pages_alloc_boot() to return immediately when > max_huge_pages is 0, saving cycles when hugepages aren't configured > in the kernel command line. Do we really care? -- Cheers David / dhildenb