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[PATCH v8 11/30] mm: split PMD swap entries into PTE swap entries Cc: , "Baoquan He" , , , , , , , , , , , "Nico Pache" , "Liam R.Howlett" , , "Vlastimil Babka" , , , , , , , , To: "Usama Arif" , "Andrew Morton" , , , , , From: "Zi Yan" X-Mailer: aerc 0.22.0 References: <20261002095503.3585565-1-usama.arif@linux.dev> <20261002095503.3585565-12-usama.arif@linux.dev> In-Reply-To: <20261002095503.3585565-12-usama.arif@linux.dev> X-ClientProxiedBy: YQZPR01CA0134.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:87::11) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|CH1PPFC8B3B7859:EE_ X-MS-Office365-Filtering-Correlation-Id: 68dda012-5df0-473d-cf73-08df25ab5ccb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014|23010399003|18002099003|22082099003|10067099003|4143699003|11063799006|56012099006; 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 +LEecYxn Ug/sRu6Twuz81oM/wbJAkMTgrmjQR4T+AHUvr0VjETYUYNAIzXANQwqEBaJ3FRuoFg3Dm4PrYcmhfiH8BidRP4dSVOTuFeM1e0SxuPTAsfejFSAMAdF+2txq94cNzJXPFhLF3jB7jzgy+jsfHxU+3l+lSav+fYUyHWvO+ZNyrlPuu1ipA4rgde1nr15Duco5J1hew3XmTltT42Xw9A5lOV0VrwjTaM5zsM9Ixe3mil+AVwT7R3QoIIomVkQJnubVhokJjD75duCoQf+pGrJHlwZjJYAptV24oe5QsqbUgLjZbua+TtPowY2MIiMIwFNxTtUrPaO4IoVys/y2dVJO/Piey+SNWrfQ2BJ2Ap+M95DuBQ1TrH7PaFyYa89tj9D4Z7h4PE2iwJKJOUxgYgJL4bHnXTA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri Oct 2, 2026 at 5:52 AM EDT, Usama Arif wrote: > Once a PMD can hold a swap entry, everything that splits a PMD - mprotect= () > or munmap() over part of the range, MADV_FREE, a pagewalk with no PMD > handler - has to be able to split that entry too. A swap PMD already pass= es > the pmd_is_valid_softleaf() gate, so without this it reaches > __split_huge_pmd_locked() and falls through to the present-PMD path, whic= h > pmdp_invalidate()s it and calls pmd_page() on a non-present entry. > > No reference counting is needed: a swap entry pins no folio, and swap_map > is already one per slot, so the PTEs simply take over what the PMD held. > > The migration-only entry point cannot reach the new branch: > page_vma_mapped_walk() never hands back a swap PMD, and > __split_huge_pmd_locked() already asserts that to_migration_entries > implies a present or device-private PMD. > > Test the pre-split old_pmd rather than re-reading *pmd in the trailing > folio_remove_rmap_pmd() gate, so every entry-type test in the function > interrogates the same snapshot. That part is cosmetic: pmdp_invalidate() > leaves the PMD present as far as software is concerned. > > Signed-off-by: Usama Arif > --- > mm/huge_memory.c | 22 +++++++++++++++++++++- > 1 file changed, 21 insertions(+), 1 deletion(-) > LGTM. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi