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[PATCH 1/5] mm/huge_memory: do not touch frozen folios in deferred_split_isolate() Cc: , , , , , , , , , , , "Kiryl Shutsemau (Meta)" To: "Kiryl Shutsemau" , , , , , From: "Zi Yan" X-Mailer: aerc 0.22.0 References: <20260826162101.1314941-1-kirill@shutemov.name> <20260826162101.1314941-2-kirill@shutemov.name> In-Reply-To: <20260826162101.1314941-2-kirill@shutemov.name> X-ClientProxiedBy: YQZPR01CA0047.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:86::28) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|PH0PR12MB7960:EE_ X-MS-Office365-Filtering-Correlation-Id: ee147d69-69d4-4acc-2ef2-08df039170c1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|23010399003|366016|56012099006|10067099003|5023799004|11063799006|4143699003|18002099003|22082099003; X-Microsoft-Antispam-Message-Info: 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 kZxWIEv/ dAHJ8VBwy9oiEOJl3qE7FL78m38WmaCDWJphV9z0fwPS60s9hpg260XuWqgUbkV00EN3+stiyR86ddI9opozRplPUwViiJrC922GrZqDMsWTZ2AaTZsYU/jTUpxbkF2A3x3wv287wf73shLPoY9zI2pxZEj44ItM0dC+FiGoarSEIZUjUpnCX8kItlHZiYtX3r0o6hRow0rKz3AIGa2cgo+bVgNsKsizJaFOW6jBTLUwFi6ag6qu3BmbaEbEg7MhAIHCnVM7Jy1wZ0SDUrUmnaNqs+gbCuOVrxWYmAhdxa6sn6H7T00ry1q9NVBFJ5zwYb9bLR5KGOLYEUlLqzIGodjWsQKrjwK38OJNN0bkOLa23EnPLleDHb4m241U6Pux4JMma2OQBzcQDdAd0iuCSVkXsdtGJOFvEOAEO4+SwEOF9Q/IGK0cRnjl8ztVvdDmqt7b0m+jj/+rhWqAR4F15NTZMcQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed Aug 26, 2026 at 12:20 PM EDT, Kiryl Shutsemau wrote: > From: "Kiryl Shutsemau (Meta)" > > deferred_split_isolate() probes each queued folio with folio_try_get(). > folio_try_get() failure is treated as a lost race with folio_put(): clear > PG_partially_mapped, correct MTHP_STAT_NR_ANON_PARTIALLY_MAPPED, take > the folio off the queue. > > The folio_put() race is the most common case for !folio_try_get(), but > it is not the only option. Another scenario is folio_ref_freeze(). > > A zero refcount in such cases does not mean the folio is going away. It > means "don't touch me" and current deferred_split_isolate() doesn't > respect it. It can lead to unqueueing folios from the deferred list for > no reason: > > CPU 0 CPU 1 > --------------------------- ------------------------------ > freeze a mapped folio deferred_split_scan() > folio_ref_freeze() folio_try_get() fails > folio_clear_partially_mapped() > NR_ANON_PARTIALLY_MAPPED-- > folio off the queue > give up, put it back > folio_ref_unfreeze() > > The folio is still partially mapped, but it is no longer a split candidat= e. > Nothing queues it again until part of it is unmapped once more. > > Skip the folio instead: whoever freezes the folio, owns it and owner is > responsible for its fate. It also covers the folio_put() case: > __folio_put() unqueues the folio via folio_unqueue_deferred_split(). > > Reported-by: Lance Yang > Link: https://lore.kernel.org/all/20260824131224.73344-1-lance.yang@linux= .dev/ Should this be Closes: ? > Assisted-by: Claude-Code:claude-opus-5 > Signed-off-by: Kiryl Shutsemau (Meta) > --- > mm/huge_memory.c | 19 ++++--------------- > 1 file changed, 4 insertions(+), 15 deletions(-) > Otherwise, LGTM. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi