The MIGRATE_HIGHATOMIC pages are used for order > 0 allocation,
so pages in MIGRATE_HIGHATOMIC order0 freelist are invalid.
This patch can solve the allocation failure from buddy, due to
the reserved MIGRATE_HIGHATOMIC order0 pages.
Signed-off-by: Zhiguo Jiang <justinjiang@xxxxxxxx>
---
mm/page_alloc.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 14b51d1ef4c3..10c5b053bedf 100755
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -831,6 +831,9 @@ static inline void __free_one_page(struct page *page,
else
to_tail = buddy_merge_likely(pfn, buddy_pfn, page, order);
+ if (unlikely(!order && is_migrate_highatomic(migratetype)))
+ migratetype = MIGRATE_MOVABLE;
+
if (to_tail)
add_to_free_list_tail(page, zone, order, migratetype);
else
@@ -1639,9 +1642,13 @@ static int move_freepages(struct zone *zone,
VM_BUG_ON_PAGE(page_zone(page) != zone, page);
order = buddy_order(page);
- move_to_free_list(page, zone, order, migratetype);
+ if (unlikely(!order && is_migrate_highatomic(migratetype)))
+ move_to_free_list(page, zone, order, MIGRATE_MOVABLE);
+ else {
+ move_to_free_list(page, zone, order, migratetype);
+ pages_moved += 1 << order;
+ }
pfn += 1 << order;
- pages_moved += 1 << order;
}
return pages_moved;
--
2.39.0
