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[PATCH v2 09/14] mm/shmem: rescan after nonuniform folio splitting Cc: , , , "Kiryl Shutsemau (Meta)" To: "David Hildenbrand (Arm)" , "Andrew Morton" , "Gregory Price" , "Joshua Hahn" , "Rakie Kim" , "Ying Huang" , "Johannes Weiner" , "Vladimir Davydov" , "Michal Hocko" , "Hugh Dickins" , "Baolin Wang" , "Lukas Czerner" , "Carlos Maiolino" , "Christian Brauner" , "Jan Kara" , "Daniel Verkamp" , "Jeff Xu" , "Muchun Song" , "Oscar Salvador" , "David Stevens" , "Matthew Wilcox (Oracle)" , "William Kucharski" , "Chris Li" , "Kairui Song" , "Nhat Pham" , "Miaohe Lin" , "Naoya Horiguchi" From: "Zi Yan" X-Mailer: aerc 0.22.0 References: <20261027-fixes_shmem-v2-0-86a00952acb9@kernel.org> <20261027-fixes_shmem-v2-9-86a00952acb9@kernel.org> In-Reply-To: <20261027-fixes_shmem-v2-9-86a00952acb9@kernel.org> X-ClientProxiedBy: YQZPR01CA0044.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:86::23) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) X-Archived-By: MIME-Version: 1.0 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 GgieEMUQ 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Tue Oct 27, 2026 at 9:03 AM EDT, David Hildenbrand (Arm) wrote: > The final scan in shmem_undo_range() restarts after a successful split > only if the original folio is no longer large. A nonuniform split can > leave that folio large, so the scan skips the newly created folios. > Hole punching then leaves pages within the hole allocated even though > they could be discarded. > > For example, a fault below the hole can allocate a 2 MiB folio after > boundary handling. Punching a 1 MiB hole at offset 64 KiB splits the > folio successfully but leaves the original folio at order 4. The scan > continues past all 512 pages, leaving 2 MiB allocated instead of 1 MiB. > The hole reads as zero, but the pages and their block charges remain. > > Fixes: 7460b470a131 ("mm/truncate: use folio_split() in truncate operatio= n") > Cc: stable@vger.kernel.org > Reviewed-by: Baolin Wang > Acked-by: Kiryl Shutsemau (Meta) > Tested-by: Gregory Price (Meta) > Signed-off-by: David Hildenbrand (Arm) > --- > mm/shmem.c | 16 +++++----------- > 1 file changed, 5 insertions(+), 11 deletions(-) > Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi