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[149.14.88.26]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7ebecb1825bsm848326885a.10.2025.08.27.04.51.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 27 Aug 2025 04:51:17 -0700 (PDT) Message-ID: <1be63942-f3a8-404f-bf26-cfe7eaf2ef58@redhat.com> Date: Wed, 27 Aug 2025 13:51:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/hugetlb: two-phase hugepage allocation when reservation is high To: "Li,Rongqing" , "muchun.song@linux.dev" , "osalvador@suse.de" , "akpm@linux-foundation.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "giorgitchankvetadze1997@gmail.com" Cc: "Xu,Wenjie(ACG CCN)" References: <33c9676b1fda4cbaa42857787e03c7ec@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: <33c9676b1fda4cbaa42857787e03c7ec@baidu.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: HXdlHDanItjehbD-IQ0D_phgmEMkRF_4CVKgegfDou0_1756295478 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: 8B560140014 X-Stat-Signature: gbaygy6x9d1up1jhfgexoxs5c8u6ow5e X-Rspam-User: X-HE-Tag: 1756295480-663115 X-HE-Meta: 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 hz+Bv753 N1Ig2Ug6fMksQ7sYbtKjNmqV1mXk/zv2fn/NXrY9LgSqPc/fGGd4ZliiCHWaM7heKuE9aH8flATpJz/bZJ7FwN0EhGD+nXHXqeb3+iQutFzlIDthkDLnkAl5loMAiFWtso5cVpHz66OC6qD98CiOT0HOhnvsiuERiIFNJnDDEGs4VFLNrMh0UwYwaYijQ6EraM8+yvax6CXAAiDI2s2kixO2I7qysNq2DqgnUbkSOA4JS8NXcJORgKhln2FuNkPduJA+Hej2llZFLfL7mKevl2MtFy5zn3W25ZVJbPMy9zDLV37IEn/Rxh6sm7bsPL88R3PSipiwbtbyvqE856iTQjSsKZNjCAvi1YEGZgFx+nDRAIYSGnT9mtWloXry7OL8+30WmlWGTW2El0/ounjAiJ81Xfq5HvMBmjSgEJHJ55VsJcKkbVmX0bD+iLbyCqH/dhwsP5ZLhhkmPpAo= 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 27.08.25 06:12, Li,Rongqing wrote: > > . >> >> Also, can't we fail lightly during the first attempt and dynamically decide if we >> should do a second pase? >> > > > Good idea, like below > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index 753f99b..425a759 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -3589,6 +3589,7 @@ static unsigned long __init hugetlb_pages_alloc_boot(struct hstate *h) > > unsigned long jiffies_start; > unsigned long jiffies_end; > + unsigned long remaining; > > job.thread_fn = hugetlb_pages_alloc_boot_node; > job.start = 0; > @@ -3620,6 +3621,18 @@ static unsigned long __init hugetlb_pages_alloc_boot(struct hstate *h) > > jiffies_start = jiffies; > padata_do_multithreaded(&job); > + > + if (h->nr_huge_pages != h->max_huge_pages && hugetlb_vmemmap_optimizable(h)) { > + remaining = h->max_huge_pages - h->nr_huge_pages; > + /* vmemmap optimization can save about 1.6% (4/250) memory */ > + remaining = min(remaining, (h->nr_huge_pages * 4 / 250)); I don't like hard coding that here. > + > + job.start = h->nr_huge_pages; > + job.size = remaining; > + job.min_chunk = remaining / hugepage_allocation_threads; > + padata_do_multithreaded(&job); > + } Thinking out load, can't we try in a loop until either a) We allocated all we need b) We don't make any more progress Not sure if something like the following could fly: diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 1f42186a85ea4..dfb4d717b8a02 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3595,8 +3595,6 @@ static unsigned long __init hugetlb_pages_alloc_boot(struct hstate *h) unsigned long jiffies_end; job.thread_fn = hugetlb_pages_alloc_boot_node; - job.start = 0; - job.size = h->max_huge_pages; /* * job.max_threads is 25% of the available cpu threads by default. @@ -3620,10 +3618,24 @@ static unsigned long __init hugetlb_pages_alloc_boot(struct hstate *h) } job.max_threads = hugepage_allocation_threads; - job.min_chunk = h->max_huge_pages / hugepage_allocation_threads; jiffies_start = jiffies; - padata_do_multithreaded(&job); + /* TODO: comment why we retry and how it interacts with vmemmap op. */ + while (h->nr_huge_pages != h->max_huge_pages) { + unsigned long remaining = h->max_huge_pages - h->nr_huge_pages; + + job.start = h->nr_huge_pages; + job.size = remaining; + job.min_chunk = remaining / hugepage_allocation_threads; + padata_do_multithreaded(&job); + + if (hugetlb_vmemmap_optimizable(h)) + break; + + /* Stop if there is no progress. */ + if (remaining == h->max_huge_pages - h->nr_huge_pages) + break; + } jiffies_end = jiffies; pr_info("HugeTLB: allocation took %dms with hugepage_allocation_threads=%ld\n", -- Cheers David / dhildenb