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Received: from willy by casper.infradead.org with local (Exim 4.98 #2 (Red Hat Linux)) id 1tlTSA-0000000Dtpg-3mgR; Fri, 21 Feb 2025 13:52:30 +0000 Date: Fri, 21 Feb 2025 13:52:30 +0000 From: Matthew Wilcox To: thomas.prescher@cyberus-technology.de Cc: Jonathan Corbet , Muchun Song , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 1/2] mm: hugetlb: add hugetlb_alloc_threads cmdline option Message-ID: References: <20250221-hugepage-parameter-v1-0-fa49a77c87c8@cyberus-technology.de> <20250221-hugepage-parameter-v1-1-fa49a77c87c8@cyberus-technology.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250221-hugepage-parameter-v1-1-fa49a77c87c8@cyberus-technology.de> X-Rspamd-Queue-Id: 817C9C0017 X-Stat-Signature: 65emyut9h5oj1uoa93iyy4i54fg64psw X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1740145958-239813 X-HE-Meta: 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 slGgew5l W2DXdN8CSFFPjpoP4oeakG6bNJxYK4JvuJRUYdy8I48FeNCEOPcL2ZBO/kRCg4Wzq+dbp1osI7lQifi4RYyGJ0TAKjxZQjUezSEuEcq/+lng7Zt6TTKHDq/cRctB8PWYlmtPmzW46CMvIKJ6P2RvXvNY+HWFvIt4P6PxufSodgZwp3KktLhJBBYvPhTt2cd/CdStosCWHPp4WPcYUAFk6Dv/Rg3qmUU+6aOse4f/3LCpK6DBxcL/4mAH8WjUz5aN12HXeirnlO1JIY1SfX1/eGOt0zw== 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 Fri, Feb 21, 2025 at 02:49:03PM +0100, Thomas Prescher via B4 Relay wrote: > Add a command line option that enables control of how many > threads per NUMA node should be used to allocate huge pages. I don't think we should add a command line option (ie blame the sysadmin for getting it wrong). Instead, we should figure out the right number. Is it half the number of threads per socket? A quarter? 90%? It's bootup, the threads aren't really doing anything else. But we should figure it out, not the sysadmin.