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[PATCH 2/2] mm/migrate: exclude hugetlb folios from MTHP_STAT_NR_ANON accounting Cc: , , "Oscar Salvador" , "Andrew Morton" , "Matthew Brost" , "Joshua Hahn" , "Rakie Kim" , "Byungchul Park" , "Gregory Price" , "Ying Huang" , "Alistair Popple" To: "Nico Pache" , "Barry Song" , "David Hildenbrand" , , , From: "Zi Yan" X-Mailer: aerc 0.21.0 References: <20260702172548.37075-1-npache@redhat.com> <20260702172548.37075-3-npache@redhat.com> In-Reply-To: <20260702172548.37075-3-npache@redhat.com> X-ClientProxiedBy: DS1PR06CA0015.namprd06.prod.outlook.com (2603:10b6:8:23e::14) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|CH3PR12MB9395:EE_ X-MS-Office365-Filtering-Correlation-Id: f2ccbd98-b559-49d8-7071-08ded86011e4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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dlNqxY3hEKAxSag8Y5PvEkI3kS1mKcbT1KDTyTD16itn0QUzAPPchtWn/eSOyYw75BtgLdPBj+phQesPg9k+yhgfgLSYz/t12GdbzOXvzlJgd9P4YtCIhx+JxF+Ko+lLS8tnpZvltAxmCThgtnnjGucwfDiQAylfGjKaTEz7sHxxJQQQ6kpsauynuY2ZNX3P2/fxcKRNwOpR+pdTJW0B2XZckYqanEsPtw6tl6VXvkgPo1FBWYLDxagXIn788ek31TtNTj3pMUSL972xCammF3PSLFd4oysExYAxLUbIwwbhfCA8uktU3j3b9c9KmppjSUHx8ZuKrR7AbU+WAcESz1p/Q8q4JFc7wItFm1tsc21tgDVaZyErz99LtDquMS6DBF/M7Ru7/RN4noaXeEAMkq1rUg0+rNgkoZIc0/YJ+CZgEbxPkmbC2FnjGgY1guCobV4u6THkT6a3YabW5ciTOIhBjrU40f/rrFDG6YrZgym6MlpQ3OzweA05SRxMEaF7mo1WzW4XjJtRv7snGvkTY/7UcZuHuB3dFh7o3NVrylJW4udrTewA/kzaKT2chhjzKJjBc Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu Jul 2, 2026 at 1:25 PM EDT, Nico Pache wrote: > __folio_migrate_mapping() increments MTHP_STAT_NR_ANON for the > destination folio when `folio_test_anon(folio) && folio_test_large(folio)= ` > is true. However, hugetlb folios satisfy both conditions despite having a > completely separate accounting system; they use hugetlb_add_anon_rmap() > which does not touch mTHP stats, and their free path also bypasses the > mTHP decrement in __free_pages_prepare(). > > This causes MTHP_STAT_NR_ANON to be incremented on each hugetlb > migration without a corresponding decrement, permanently inflating the > nr_anon counter. > > Add a !folio_test_hugetlb() check to both places in > __folio_migrate_mapping() so that only actual mTHP folios are counted. > > Fixes: 5d65c8d758f2 ("mm: count the number of anonymous THPs per size") > Co-developed-by: David Hildenbrand > Signed-off-by: David Hildenbrand > Signed-off-by: Nico Pache > --- > mm/migrate.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > LGTM. Thanks. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi