Usually, migration pages coming to unmap_and_move()'s putback_lru_page()
have been charged and have pc->mem_cgroup set; but there are several ways
in which a freshly allocated uncharged page can get there, oopsing when
added to LRU. Call mem_cgroup_reset_owner() immediately after allocating.
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
---
Fix N to
memcg: clear pc->mem_cgorup if necessary.
mm/migrate.c | 2 ++
1 file changed, 2 insertions(+)
--- mmotm.orig/mm/migrate.c 2011-12-22 02:53:31.900041565 -0800
+++ mmotm/mm/migrate.c 2011-12-28 14:52:37.243034125 -0800
@@ -841,6 +841,8 @@ static int unmap_and_move(new_page_t get
if (!newpage)
return -ENOMEM;
+ mem_cgroup_reset_owner(newpage);
+
if (page_count(page) == 1) {
/* page was freed from under us. So we are done. */
goto out;
--
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