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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Jonathan Corbet , linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Hugh Dickins Subject: Re: [PATCH] docs: update THP documentation to clarify sysfs "never" setting Message-ID: References: <20250721155530.75944-1-lorenzo.stoakes@oracle.com> <35df32ae-dc95-48e1-bdb1-90f17bfd4d5c@linux.alibaba.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: LO4P123CA0636.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:294::14) To DM4PR10MB8218.namprd10.prod.outlook.com (2603:10b6:8:1cc::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR10MB8218:EE_|SJ5PPFD1D499C15:EE_ X-MS-Office365-Filtering-Correlation-Id: 5f67681f-a527-4c43-a447-08ddc9ff71ff X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|366016; X-Microsoft-Antispam-Message-Info: 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update the man page as I find it far too > vague on this topic currently, so that patch will be coming soon. Actually: MADV_COLLAPSE is independent of any sysfs (see sysfs(5)) setting under /sys/kernel/mm/transparent_hugepage, both in terms of determining THP eligibility, and allocation semantics. See Linux kernel source file Documentation/admin-guide/mm/transhuge.rst for more information. MADV_COLLAPSE also ignores huge= tmpfs mount when operating on tmpfs files. Allocation for the new hugepage may enter direct reclaim and/or compaction, regardless of VMA flags (though VM_NOHUGEPAGE is still respected). I think this is clear enough to require no update. THe confusion arose from the doc page seemingly contradicting this. By referring to the doc page which now makes things clear, we're all good! :) Cheers, Lorenzo