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Subject: Re: [PATCH 2/5] mm/huge_memory: dequeue the deferred split after the split freeze Cc: , , , , , , , , , , , "Kiryl Shutsemau (Meta)" To: "Kiryl Shutsemau" , , , , , , "Kairui Song" X-Mailer: aerc 0.22.0 References: <20260826162101.1314941-1-kirill@shutemov.name> <20260826162101.1314941-3-kirill@shutemov.name> In-Reply-To: <20260826162101.1314941-3-kirill@shutemov.name> X-ClientProxiedBy: YQBP288CA0015.CANP288.PROD.OUTLOOK.COM (2603:10b6:c01:6a::12) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|DS0PR12MB6413:EE_ X-MS-Office365-Filtering-Correlation-Id: d92c3efa-4f51-4051-57a7-08df0394f182 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|7416014|23010399003|18002099003|22082099003|10067099003|56012099006|11063799006|4143699003; X-Microsoft-Antispam-Message-Info: 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Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: d92c3efa-4f51-4051-57a7-08df0394f182 X-MS-Exchange-CrossTenant-AuthSource: IA0PR12MB8374.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Aug 2026 17:10:35.5044 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: OpGpcJbelDLpJhPvehdF1q+V7baIeiABfwOXKWT/PlEMox+aMt+xu10FsMUZ6Scn X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB6413 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 5D7C9C0006 X-Stat-Signature: ossr7h81csd7dahyynrsyxss7cpjkedc X-HE-Tag: 1787764247-38851 X-HE-Meta: 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 HHE/7G6N il64dw6lTe60fD+mGF1gK7dB9x2ApG4xFyW76e6BXUCiwo6xFj/6QNMuHGtmM2jUbBOhX5OPbzZP+fbGB4SBb55aILwnTYkIyORPrebMyC8mr1hi5xzaDNYyUr2fIgSISW0jCDabW1kqi19vs/YRXHSfsmPUjNYrPAFOVew+AA9h1j+ygellbVxtrAO0baL/nNyWIjjaKChQonaRMIG6YOHd0tF9KoceXSFhxo/IlOR+u+LFpjfyFYtVWmiJBl0oVXCqquBmYe2/q+nPtdOqw4E6jP8n4H0O1Ex6MKFuVnRlH8qelxmEN7CBSmVveDFxSRrHl4DiIZwbqzBs24PBFyee2HWchZQwBMVDyATicwmj870LpNPElqHUhsLO5yizl89fdo4EUrpdVlQrmDj45yWFkT7deMpnZC8aLsQuUJQyExeBIbWJETtUHQK079pX52COy4zPfkJceRUv5+YRWaP++8w== 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)" > > __folio_freeze_and_split_unmapped() takes the deferred split list_lru loc= k > across the freeze. It is only there to stop deferred_split_scan() from > touching the folio under split. > > With deferred_split_isolate() fixed, the workaround can be dropped. > > Unqueue the folio after folio_ref_freeze(), the way > __folio_migrate_mapping() does: folio_unqueue_deferred_split() needs a > zero refcount and a memcg still set, and both hold there. > > If the split is called from deferred_split_scan(), the unqueue is a > no-op -- the folio is already removed from the list. But > PG_partially_mapped is still set, so it has to be cleared here or > MTHP_STAT_NR_ANON_PARTIALLY_MAPPED never comes back down. > > Assisted-by: Claude-Code:claude-opus-5 > Signed-off-by: Kiryl Shutsemau (Meta) > --- > mm/huge_memory.c | 44 +++++++++++++------------------------------- > 1 file changed, 13 insertions(+), 31 deletions(-) +Kairui, since the change affects his cleanup series. I assume this will be picked up sooner than Kairui's large series. > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index 6281ed993243..c84e8cbc986d 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -3931,41 +3931,27 @@ static int __folio_freeze_and_split_unmapped(stru= ct folio *folio, unsigned int n > struct folio *end_folio =3D folio_next(folio); > struct folio *new_folio, *next; > int old_order =3D folio_order(folio); > - struct list_lru_one *lru; > - bool dequeue_deferred; > int ret =3D 0; > =20 > VM_WARN_ON_ONCE(!mapping && end); > - /* > - * If this folio can be on the deferred split queue, lock out > - * the shrinker before freezing the ref. If the shrinker sees > - * a 0-ref folio, it assumes it beat folio_put() to the list > - * lock and must clean up the LRU state - the same dequeue we > - * will do below as part of the split. > - */ > - dequeue_deferred =3D folio_test_anon(folio) && old_order > 1; > - if (dequeue_deferred) { > - struct mem_cgroup *memcg; > =20 > - rcu_read_lock(); > - memcg =3D folio_memcg(folio); > - lru =3D list_lru_lock(&deferred_split_lru, > - folio_nid(folio), &memcg); > - } > if (folio_ref_freeze(folio, folio_cache_ref_count(folio) + 1)) { > struct swap_cluster_info *ci =3D NULL; > struct lruvec *lruvec; > =20 > - if (dequeue_deferred) { > - __list_lru_del(&deferred_split_lru, lru, > - &folio->_deferred_list, folio_nid(folio)); > - if (folio_test_partially_mapped(folio)) { > - folio_clear_partially_mapped(folio); > - mod_mthp_stat(old_order, > - MTHP_STAT_NR_ANON_PARTIALLY_MAPPED, -1); > - } > - list_lru_unlock(lru); > - rcu_read_unlock(); > + /* Take off the deferred split queue while frozen and memcg set */ > + folio_unqueue_deferred_split(folio); > + > + /* > + * deferred_split_scan() takes the folio off the queue before it > + * splits it, so the unqueue above finds an empty list and > + * leaves PG_partially_mapped set. > + * Clear it here: the flag does not survive the split. > + */ > + if (folio_test_partially_mapped(folio)) { > + folio_clear_partially_mapped(folio); > + mod_mthp_stat(old_order, > + MTHP_STAT_NR_ANON_PARTIALLY_MAPPED, -1); > } > =20 > if (mapping) { > @@ -4067,10 +4053,6 @@ static int __folio_freeze_and_split_unmapped(struc= t folio *folio, unsigned int n > if (ci) > swap_cluster_unlock(ci); > } else { > - if (dequeue_deferred) { > - list_lru_unlock(lru); > - rcu_read_unlock(); > - } > return -EAGAIN; > } > =20 This is a great cleanup. Thanks. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi