[PATCH] mm: consider CMA pages in watermark check for NUMA balancing target node

[kaiyang2@cs.cmu.edu]

From: Kaiyang Zhao <kaiyang2@cs.cmu.edu>

Currently in migrate_balanced_pgdat(), ALLOC_CMA flag is not passed
when checking watermark on the migration target node. This does not
match the gfp in alloc_misplaced_dst_folio() which allows allocation
from CMA.

This causes promotion failures when there are a lot of available CMA
memory in the system.

Therefore, we change the alloc_flags passed to zone_watermark_ok() in
migrate_balanced_pgdat().

Signed-off-by: Kaiyang Zhao <kaiyang2@cs.cmu.edu>
---
 mm/migrate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 8578a930cad1..aa482c954cb0 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2526,7 +2526,7 @@ static bool migrate_balanced_pgdat(struct pglist_data *pgdat,
 		if (!zone_watermark_ok(zone, 0,
 				       high_wmark_pages(zone) +
 				       nr_migrate_pages,
-				       ZONE_MOVABLE, 0))
+				       ZONE_MOVABLE, ALLOC_CMA))
 			continue;
 		return true;
 	}
-- 
2.43.0