[v2 PATCH 4/7] mm: migrate: account THP NUMA migration counters correctly

Yang Shi
2021-04-13T21:24:39Z

Now both base page and THP NUMA migration is done via migrate_misplaced_page(),
keep the counters correctly for THP.

Signed-off-by: Yang Shi <shy828301@gmail.com>
---
mm/migrate.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 333448aa53f1..a473f25fbd01 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2111,6 +2111,7 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
LIST_HEAD(migratepages);
new_page_t *new;
bool compound;
+ unsigned int nr_pages = thp_nr_pages(page);

/*
* PTE mapped THP or HugeTLB page can't reach here so the page could
@@ -2149,13 +2150,13 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
if (nr_remaining) {
if (!list_empty(&migratepages)) {
list_del(&page->lru);
- dec_node_page_state(page, NR_ISOLATED_ANON +
- page_is_file_lru(page));
+ mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON +
+ page_is_file_lru(page), -nr_pages);
putback_lru_page(page);
}
isolated = 0;
} else
- count_vm_numa_event(NUMA_PAGE_MIGRATE);
+ count_vm_numa_events(NUMA_PAGE_MIGRATE, nr_pages);
BUG_ON(!list_empty(&migratepages));
return isolated;

--
2.26.2