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Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1qR9yx-00FtnV-18; Wed, 02 Aug 2023 11:25:35 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 9D60C300301; Wed, 2 Aug 2023 13:25:34 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 7CCB421000C78; Wed, 2 Aug 2023 13:25:34 +0200 (CEST) Message-ID: <20230802112458.230221601@infradead.org> User-Agent: quilt/0.66 Date: Wed, 02 Aug 2023 13:24:58 +0200 From: Peter Zijlstra To: yury.norov@gmail.com, andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk Cc: peterz@infradead.org, Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, tglx@linutronix.de, rppt@kernel.org Subject: [PATCH 0/2] nodemask: Use nr_node_ids X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: EF7BB16001F X-Stat-Signature: yszya9tubq8p9asr1jirmq45j9sybq3o X-Rspam-User: X-HE-Tag: 1690975540-962930 X-HE-Meta: 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 vkVCNNkw SZH6O2TQ9Xd6cc6KPYEJDLEZ4Ak/P04lzRBrvRr92AtrinGrM+twStlTbybl6prphs7pM1h48tQmwb6qR9D/FWcYrCkb1apdq8Ekk+I3l4lBRd18wrHCChRxYqsK3C+fPtQUZfdxx2pKqOAsQVrcbc240Jyq9mjsztCtFNIh0Xk9g1v5N85oIb0M4UCB/YHje5E1rREBAtnXeZtLSxb6L6AgwoKclxVyKFVDsUGAUgxdfocdOq8PPZjFI5YnglxJmNFQkwwqAkJnqhnlJRd8+dhpOYA== 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: Hi, While working on some NUMA code recently, I stumbled over how nodemask operations are unconditionally using MAX_NUMNODES length, which is typically 1024 for distro configs. OTOH typical machines only have <=4 nodes, so doing these crazy long bitmap ops is silly. Therefore do as cpumask does and use nr_node_ids analogous to nr_cpu_ids. These patches are lightly tested -- as in they seem to boot on a 2 node system.