[PATCH v1] mm/vmscan: check the return value of migrate_pages()

Li Zhong
2022-09-17T02:13:25Z

Check the return value of migrate_pages() to check error exeuction.

Signed-off-by: Li Zhong <floridsleeves@gmail.com>
---
mm/vmscan.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index b2b1431352dc..50aaaa9377e2 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1547,6 +1547,7 @@ static unsigned int demote_page_list(struct list_head *demote_pages,
{
int target_nid = next_demotion_node(pgdat->node_id);
unsigned int nr_succeeded;
+ int ret;

if (list_empty(demote_pages))
return 0;
@@ -1555,10 +1556,13 @@ static unsigned int demote_page_list(struct list_head *demote_pages,
return 0;

/* Demotion ignores all cpuset and mempolicy settings */
- migrate_pages(demote_pages, alloc_demote_page, NULL,
+ ret = migrate_pages(demote_pages, alloc_demote_page, NULL,
target_nid, MIGRATE_ASYNC, MR_DEMOTION,
&nr_succeeded);

+ if (ret)
+ putback_movable_pages(&pagelist);
+
if (current_is_kswapd())
__count_vm_events(PGDEMOTE_KSWAPD, nr_succeeded);
else
--
2.25.1