[PATCH v2] vmscan: fix increasing nr_isolated incurred by putback unevictable pages

Jaewon Kim
2015-08-04T10:40:38Z

reclaim_clean_pages_from_list() assumes that shrink_page_list() returns
number of pages removed from the candidate list. But shrink_page_list()
puts back mlocked pages without passing it to caller and without
counting as nr_reclaimed. This incurrs increasing nr_isolated.
To fix this, this patch changes shrink_page_list() to pass unevictable
pages back to caller. Caller will take care those pages.

Signed-off-by: Jaewon Kim <jaewon31.kim@samsung.com>
---
Changes since v1

1/ changed subject from vmscan: reclaim_clean_pages_from_list() must count mlocked pages
2/ changed to return unevictable pages rather than returning the number of unevictable pages

mm/vmscan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5e8eadd..a4b2d07 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1157,7 +1157,7 @@ cull_mlocked:
if (PageSwapCache(page))
try_to_free_swap(page);
unlock_page(page);
- putback_lru_page(page);
+ list_add(&page->lru, &ret_pages);
continue;

activate_locked:
--
1.9.1