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[2003:d8:2f37:2b00:948c:dd9f:29c8:73f4]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b7e7fec07sm147030765e9.10.2025.09.01.03.10.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 01 Sep 2025 03:10:50 -0700 (PDT) Message-ID: <9a85a903-ac8d-4198-a8d4-01d70f23b443@redhat.com> Date: Mon, 1 Sep 2025 12:10:49 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH][v4] mm/hugetlb: retry to allocate for early boot hugepage allocation To: lirongqing , muchun.song@linux.dev, osalvador@suse.de, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, giorgitchankvetadze1997@gmail.com References: <20250901082052.3247-1-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: <20250901082052.3247-1-lirongqing@baidu.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 87m_GHpk3yHaVbjC1240B0uiYPW1xYpE-v2snmFXG4g_1756721451 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: rspam08 X-Rspamd-Queue-Id: 274E8C0006 X-Stat-Signature: urh3xpygmm8rrfm6r8fqs79c8hrghy6g X-Rspam-User: X-HE-Tag: 1756721454-429291 X-HE-Meta: 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 QEGLE+Jh 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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 01.09.25 10:20, lirongqing wrote: > From: Li RongQing > > In cloud environments with massive hugepage reservations (95%+ of system > RAM), single-attempt allocation during early boot often fails due to > memory pressure. > > Commit 91f386bf0772 ("hugetlb: batch freeing of vmemmap pages") intensified > this by deferring page frees, increase peak memory usage during allocation. > > Introduce a retry mechanism that leverages vmemmap optimization reclaim > (~1.6% memory) when available. Upon initial allocation failure, the system > retries until successful or no further progress is made, ensuring reliable > hugepage allocation while preserving batched vmemmap freeing benefits. > > Testing on a 256G machine allocating 252G of hugepages: > Before: 128056/129024 hugepages allocated > After: Successfully allocated all 129024 hugepages > > Suggested-by: David Hildenbrand > Signed-off-by: Li RongQing > --- Thanks! BTW, it's interesting to see such extreme hugetlb allocation on machines :) Acked-by: David Hildenbrand -- Cheers David / dhildenb