When I looked at zone stat mismatch problem, I found
migrate_to_node doesn't decrease NR_ISOLATED_[ANON|FILE]
if check_range fails.
It can make system hang out.
Cc: KOSAKI Motohiro <kosaki.motoh...@jp.fujitsu.com>
Cc: Mel Gorman <mgor...@suse.de>
Cc: Christoph Lameter <c...@linux.com>
Signed-off-by: Minchan Kim <minc...@kernel.org>
---
mm/mempolicy.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 3d64b36..6bf0860 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -953,16 +953,16 @@ static int migrate_to_node(struct mm_struct *mm, int
source, int dest,
vma = check_range(mm, mm->mmap->vm_start, mm->task_size, &nmask,
flags | MPOL_MF_DISCONTIG_OK, &pagelist);
- if (IS_ERR(vma))
- return PTR_ERR(vma);
-
- if (!list_empty(&pagelist)) {
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto out;
+ }
+ if (!list_empty(&pagelist))
err = migrate_pages(&pagelist, new_node_page, dest,
false, MIGRATE_SYNC);
- if (err)
- putback_lru_pages(&pagelist);
- }
-
+out:
+ if (err)
+ putback_lru_pages(&pagelist);
return err;
}
--
1.7.9.5
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