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Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1vt5WL-00000007lC1-3YKs; Thu, 19 Feb 2026 15:00:49 +0000 Date: Thu, 19 Feb 2026 15:00:49 +0000 From: Matthew Wilcox To: Bart Van Assche Cc: Hannes Reinecke , lsf-pc , "linux-nvme@lists.infradead.org" , "linux-block@vger.kernel.org" , linux-mm@kvack.org Subject: Re: [LSF/MM/BPF TOPIC] Memory fragmentation with large block sizes Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Stat-Signature: f7g1fyk7bdpen5yasnmuix8m4r9s9kts X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 2F07240017 X-HE-Tag: 1771513253-308943 X-HE-Meta: U2FsdGVkX1/G9T5mMRijOPaHzVBSv7I1npfwfcnNuvJVKapug9G/8pJsRYUMWuAUACFw/uW9REV8CNZgU7nLKzmVhR9L1QS0+ZcU3LmRKq0Afx9q2z4nvOw6wHIkm0s7qksVBPbYGmmsQ2wpDVS5kTCnzI7hnO2cvLX1JvYvvTlTYQ3wX0Ahc9M/hznmbzQhPuHvaidepEcmC9NL8S1kuV+3um2/zUFUMU/EZqhtQr6rtJDe9ruDCUvRP/VO3vTL0y2aNO/1R4TOKp4enW5OpUuoXV9Y//dl5fJHZ1uiqYmEu8ZuNaPGitgcITYmafZHepg/K953Fwp/q28lf6agixQdZIVKoYRK+u2utOnYG65oi2MkUOoDCjY51DiCVQz5mZH/0+c4pF6EpJy8zIN2UwbGVCe99LtWofHfh0NOxcwu6Zky9zykE7CRYEUzTjZrPffo16rr/UZZaU8Ieh9y7xV8BZ6tpn60hnmHYqwA0oE4kU32R/Fj8ZQzQk1TDpI81wI41mcJZhF7zV+VBE7jsiDajfv3P7MiFQHSt9HcIhmN++vRbO5LIM0+AezxDVSpL5u5cPEjEazEEBFX2D67VxaIhqol5LARTsmp86rBT7XPPihHbxGAp1LnFjXFt10/OiEv6W+TEmrKJX6HxSVDafInfWcNnAEBqGJlMIFPkis2lsoWeX0/1X2oZHuYnqO6Cm+sJftR1b3KZA2+xQrWSM+F/47eI03Uw5FLuPTFrVCGQgkhmlUwqIgtbO0tI/BqljEoKckOd561VzIDjCr/Il74avaA6rJx1iP6OfT4ZQfmaOcGF/5e9XR0rojEvWJ9vBKgD4/pVsN3AGAHvBu39eapT21CyIIEjXcuCqWKdUvNC1qhbF++87lDYsETisIP6JxAwvxYeKkaKzhmNdpd8mBz/g4bGvem3n+KO+f4ALFMZQgsK3iFHrc8ot4xb52DA8+t5VUky2YE4Ab8o0C kkM5hTwe IBj/FvP96zQ8C/cdwle5t7X12XM9ezMYgJZF24FJreTsmnLMHHPqE8L4Ll6BvZ5wJtMt3kytuthrF6ISAU557woeEXgMiD0NFleGFJ/9KwO5J1dG1Jt3srC8iHvHIHaodIZajDxbxWQoqOQiY+seVf26scZuBH4iRoMLarIGKUAO5khLJpDbrqxG9rBCdbWHwyIYYhInK2H3MbVCAPOxTq51iFnLUlJL+9BJX2Ro7FhTQsU20HEEni9NgM5ubv1oeUQPU58zsv/CYozGaNw3wzeneOOde6v1Ur4StiMx3vKqzcQCbMV7ahZViYHZuhw/qATrQRKp9yz52WFbw3Or4woINWlq2/36VWAZVIxuoD26fs/fwH8uGPQOh5NBM/kblpKNnWXrIfuL9S7LOFJjiT3Kw3u5Sq3cRdL4QjV4M8G9tTz7fT1jDfTrY3Q== 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 Thu, Feb 19, 2026 at 06:53:28AM -0800, Bart Van Assche wrote: > Additionally, why is contiguous memory required for block sizes > larger than the page size? Does this perhaps come from the VFS layer? > If so, is this something that can be fixed? No.