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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: [PATCH v1 00/10] Remove READ_ONLY_THP_FOR_FS Kconfig Date: Thu, 26 Mar 2026 21:42:45 -0400 Message-ID: <20260327014255.2058916-1-ziy@nvidia.com> X-Mailer: git-send-email 2.43.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BLAPR03CA0035.namprd03.prod.outlook.com (2603:10b6:208:32d::10) To DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB9473:EE_|LV8PR12MB9264:EE_ X-MS-Office365-Filtering-Correlation-Id: 4ac6bf8c-41bc-492c-4bd8-08de8ba23078 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|7416014|376014|18002099003|56012099003; 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The changes are: 1. collapse_file() from mm/khugepaged.c, instead of checking CONFIG_READ_ONLY_THP_FOR_FS, makes sure the mapping_max_folio_order() of struct address_space of the file is at least PMD_ORDER. 2. file_thp_enabled() also checks mapping_max_folio_order() instead. 3. truncate_inode_partial_folio() calls folio_split() directly instead of the removed try_folio_split_to_order(), since large folios can only show up on a FS with large folio support. 4. nr_thps is removed from struct address_space, since it is no longer needed to drop all read-only THPs from a FS without large folio support when the fd becomes writable. Its related filemap_nr_thps*() are removed too. 5. folio_check_splittable() no longer checks READ_ONLY_THP_FOR_FS. 6. Updated comments in various places. Changelog === >From RFC[1]: 1. instead of removing READ_ONLY_THP_FOR_FS function entirely, turn it on by default for all FSes with large folio support and the supported orders includes PMD_ORDER. Suggestions and comments are welcome. Link: https://lore.kernel.org/all/20260323190644.1714379-1-ziy@nvidia.com/ [1] Zi Yan (10): mm: remove READ_ONLY_THP_FOR_FS Kconfig option mm/khugepaged: remove READ_ONLY_THP_FOR_FS check mm: fs: remove filemap_nr_thps*() functions and their users fs: remove nr_thps from struct address_space mm/huge_memory: remove READ_ONLY_THP_FOR_FS from file_thp_enabled() mm/huge_memory: remove folio split check for READ_ONLY_THP_FOR_FS mm/truncate: use folio_split() in truncate_inode_partial_folio() fs/btrfs: remove a comment referring to READ_ONLY_THP_FOR_FS selftests/mm: remove READ_ONLY_THP_FOR_FS in khugepaged selftests/mm: remove READ_ONLY_THP_FOR_FS from comments in guard-regions fs/btrfs/defrag.c | 3 -- fs/inode.c | 3 -- fs/open.c | 27 ---------------- include/linux/fs.h | 5 --- include/linux/huge_mm.h | 25 ++------------- include/linux/pagemap.h | 29 ----------------- mm/Kconfig | 11 ------- mm/filemap.c | 1 - mm/huge_memory.c | 29 ++--------------- mm/khugepaged.c | 36 +++++----------------- mm/truncate.c | 8 ++--- tools/testing/selftests/mm/guard-regions.c | 9 +++--- tools/testing/selftests/mm/khugepaged.c | 4 +-- 13 files changed, 23 insertions(+), 167 deletions(-) -- 2.43.0