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-rw-r--r--mm/ksm.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/ksm.c b/mm/ksm.c
index 310544a379ae..1925ffbfb27f 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -28,6 +28,7 @@
#include <linux/kthread.h>
#include <linux/wait.h>
#include <linux/slab.h>
+#include <linux/memcontrol.h>
#include <linux/rbtree.h>
#include <linux/memory.h>
#include <linux/mmu_notifier.h>
@@ -1571,6 +1572,16 @@ struct page *ksm_does_need_to_copy(struct page *page,
new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
if (new_page) {
+ /*
+ * The memcg-specific accounting when moving
+ * pages around the LRU lists relies on the
+ * page's owner (memcg) to be valid. Usually,
+ * pages are assigned to a new owner before
+ * being put on the LRU list, but since this
+ * is not the case here, the stale owner from
+ * a previous allocation cycle must be reset.
+ */
+ mem_cgroup_reset_owner(new_page);
copy_user_highpage(new_page, page, address, vma);
SetPageDirty(new_page);