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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. 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 1f0ac122c3bf..2ace66772c16 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 *foliolist, 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 *foliolist, + 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 189d0548d4ce..2bf756123d55 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2739,5 +2739,41 @@ 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, dereference them, 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; + 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); + } + BUG_ON(!list_empty(folio_list)); + return nr_remaining ? -EAGAIN : 0; +} #endif /* CONFIG_NUMA_BALANCING */ #endif /* CONFIG_NUMA */ -- 2.34.1