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[2003:d8:2f07:8700:71be:5385:87b8:5a98]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b42a97c02sm30232865e9.23.2025.08.19.00.45.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 19 Aug 2025 00:45:12 -0700 (PDT) Message-ID: Date: Tue, 19 Aug 2025 09:45:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/4] mm/mm_init: deferred_init_memmap: use a job per zone To: Mike Rapoport , linux-mm@kvack.org Cc: Andrew Morton , Bill Wendling , Daniel Jordan , Justin Stitt , Michael Ellerman , Miguel Ojeda , Nathan Chancellor , Nick Desaulniers , linux-kernel@vger.kernel.org, llvm@lists.linux.dev References: <20250818064615.505641-1-rppt@kernel.org> <20250818064615.505641-3-rppt@kernel.org> 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: <20250818064615.505641-3-rppt@kernel.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 5lUl0cG4scUrYnLr68eUvQ4R9Yag_O9o6p-9IbveuFo_1755589514 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: us5zjqrfyjsafxxr5ip76puiy8kg9x3y X-Rspam-User: X-Rspamd-Queue-Id: 6DBCF40012 X-Rspamd-Server: rspam01 X-HE-Tag: 1755589517-131005 X-HE-Meta: U2FsdGVkX19IVRo/JUaiquyLOSjbam3tUQ0Kn8mYrCBRcSRMxKiEINsqr4y79LdtFXJk5fXtLnTNP9xa7Yw5RaeYLQ+EDm6ldIDQLQ3EBsSyVRmzN6wwz0ZvDYSjI08IP6Jc89OGYc/4Y35tEGT0/7CZJRVIlxLjsrg5R9pM1ZXTJJc2lRF51cIE3bMn8FrEK5NyoJ6s7Oab/ypCqcjVcVdKffgxpwCdCsks48tPKqnJ80uPdNwH09s4dst0GiKqbRMY6OIxdZ0mZ/pbSb74h9JDNcn+52mRJ9JhUUsfUbhVsOLSVfWDU6EsSmPaHEbG8k2IP6Zd/0CEZDqnAGBc62KOyqsaDJJnXCZPkihi0eHCql0Ec8GJR3byV1OyKnu7C8wDRf2WRj5BAtvlo2/n963fdRUK4fyFZOfogNmqA1NqS5jLZutUoBzOygWlw91Mfkn9JOOvF51bQf07pc/Gsxzj6YOSLP2d180/HrmZ9vhRheTqzMDn7CGIOpwN/63yx0pDMoMYvtX+W0SXiqOnyzDCSPZLrcgx18K+Um9w4/pquyK8G6sJCZx4norTWt8gYkBqS0xkyO5zvtSE+OwJIAI3yzCaS+a9cmUoNEDZjZczwVjJo80FIH4961tkfSJlTIjMFPw+MmXaETE32fTRJUzf1H6RSoPty0SZ84KN8MesmvJXbOfVFW7o2VQtcA4y/vieC2FANiNt+Fo8NiiHzGlwmnjaIR4QYGMauD1nfcp9cJPxI/OHR03BooB+bF+rhZqi/ufcc2KfNrNFBpZBCiexxKbCH10/xio21+BkYct7Fqs+e5lhAMbKWXyh+Z4FLKAoOXMYBN5P9ewA+YKFzVeEzVqXDznCQ7h+XlAcNKVFg5JbpChije9+CdhRJUUCXoNnZXwKbbH9INEmoxx9PXvkgXTxveqRGNV+MtotMkIcGWADlc6jJ6/mihKlldGjolHZnmRMfmKac+tpd1x jh03V4GS 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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 18.08.25 08:46, Mike Rapoport wrote: > From: "Mike Rapoport (Microsoft)" > > deferred_init_memmap() loops over free memory ranges and creates a > padata_mt_job for every free range that intersects with the zone being > initialized. > > padata_do_multithreaded() then splits every such range to several chunks > and runs a thread that initializes struct pages in that chunk using > deferred_init_memmap_chunk(). The number of threads is limited by amount of > the CPUs on the node (or 1 for memoryless nodes). > > Looping through free memory ranges is then repeated in > deferred_init_memmap_chunk() first to find the first range that should be > initialized and then to traverse the ranges until the end of the chunk is > reached. > > Remove the loop over free memory regions in deferred_init_memmap() and pass > the entire zone to padata_do_multithreaded() so that it will be divided to > several chunks by the parallelization code. > > Signed-off-by: Mike Rapoport (Microsoft) > --- Reviewed-by: David Hildenbrand -- Cheers David / dhildenb