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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Jan 2026 14:42:11.5615 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7458435f-10da-47c1-c673-08de5f449648 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000971E3.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4488 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 09E0D100005 X-Stat-Signature: k8jjuhtdtaqd53wjoz8w4iyuhzofjuoe X-Rspam-User: X-HE-Tag: 1769697739-156694 X-HE-Meta: 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 puYKjImt JL6nabIYAQrCo5GAhJrtVJ+EiqbEUEshC1vyzZ4+ug5NxlumQroFrm3MNx8Rwu3KYN0QeUljU0GUjXfJa3x3VC1+Xv67k4VPpoBwaCKbq9LLjrgpvrDrfTcY//RqBe2nPeoRqnOcXOw2X35gmqFRRYQaSIW55nSLcvyAyMn831EGm2qNNQg1PFMSqLk5cCGQtrJT1 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Gregory Price Tiered memory systems often require migrating multiple folios at once. Currently, migrate_misplaced_folio() handles only one folio per call, which is inefficient for batch operations. This patch introduces migrate_misplaced_folios_batch(), a batch variant that leverages migrate_pages() internally for improved performance. The caller must isolate folios beforehand using migrate_misplaced_folio_prepare(). On return, the folio list will be empty regardless of success or failure. This function will be used by pghot kmigrated thread. Signed-off-by: Gregory Price [Rewrote commit description] Signed-off-by: Bharata B Rao --- include/linux/migrate.h | 6 ++++++ mm/migrate.c | 36 ++++++++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index 26ca00c325d9..f28326b88592 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -103,6 +103,7 @@ static inline int set_movable_ops(const struct movable_operations *ops, enum pag int migrate_misplaced_folio_prepare(struct folio *folio, struct vm_area_struct *vma, int node); int migrate_misplaced_folio(struct folio *folio, int node); +int migrate_misplaced_folios_batch(struct list_head *folio_list, int node); #else static inline int migrate_misplaced_folio_prepare(struct folio *folio, struct vm_area_struct *vma, int node) @@ -113,6 +114,11 @@ static inline int migrate_misplaced_folio(struct folio *folio, int node) { return -EAGAIN; /* can't migrate now */ } +static inline int migrate_misplaced_folios_batch(struct list_head *folio_list, + int node) +{ + return -EAGAIN; /* can't migrate now */ +} #endif /* CONFIG_NUMA_BALANCING */ #ifdef CONFIG_MIGRATION diff --git a/mm/migrate.c b/mm/migrate.c index 70f8f3ad4fd8..4a3a9a4ff435 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2747,5 +2747,41 @@ int migrate_misplaced_folio(struct folio *folio, int node) BUG_ON(!list_empty(&migratepages)); return nr_remaining ? -EAGAIN : 0; } + +/** + * migrate_misplaced_folios_batch() - Batch variant of migrate_misplaced_folio. + * Attempts to migrate a folio list to the specified destination. + * @folio_list: Isolated list of folios to be batch-migrated. + * @node: The NUMA node ID to where the folios should be migrated. + * + * Caller is expected to have isolated the folios by calling + * migrate_misplaced_folio_prepare(), which will result in an + * elevated reference count on the folio. + * + * This function will un-isolate the folios, drop the elevated reference + * and remove them from the list before returning. + * + * Return: 0 on success and -EAGAIN on failure or partial migration. + * On return, @folio_list will be empty regardless of success/failure. + */ +int migrate_misplaced_folios_batch(struct list_head *folio_list, int node) +{ + pg_data_t *pgdat = NODE_DATA(node); + unsigned int nr_succeeded = 0; + int nr_remaining; + + nr_remaining = migrate_pages(folio_list, alloc_misplaced_dst_folio, + NULL, node, MIGRATE_ASYNC, + MR_NUMA_MISPLACED, &nr_succeeded); + if (nr_remaining) + putback_movable_pages(folio_list); + + if (nr_succeeded) { + count_vm_numa_events(NUMA_PAGE_MIGRATE, nr_succeeded); + mod_node_page_state(pgdat, PGPROMOTE_SUCCESS, nr_succeeded); + } + WARN_ON(!list_empty(folio_list)); + return nr_remaining ? -EAGAIN : 0; +} #endif /* CONFIG_NUMA_BALANCING */ #endif /* CONFIG_NUMA */ -- 2.34.1