From: "andrew.yang" <andrew.yang@xxxxxxxxxxxx>
damon_get_page() would always increase page _refcount and
isolate_lru_page() would increase page _refcount if the page's lru
flag is set.
If a unevictable page isolated successfully, there will be two more
_refcount. The one from isolate_lru_page() will be decreased in
putback_lru_page(), but the other one from damon_get_page() will be
left behind. This causes a pin page.
Whatever the case, the _refcount from damon_get_page() should be
decreased.
Signed-off-by: andrew.yang <andrew.yang@xxxxxxxxxxxx>
---
mm/damon/paddr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index e1a4315c4be6..56d8abd08fb1 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -223,8 +223,8 @@ static unsigned long damon_pa_pageout(struct damon_region *r)
putback_lru_page(page);
} else {
list_add(&page->lru, &page_list);
- put_page(page);
}
+ put_page(page);
}
applied = reclaim_pages(&page_list);
cond_resched();
--
2.18.0
