Add comment to MEM_CGROUP_CHARGE_TYPE_MAPPED case in
__mem_cgroup_uncharge_common().
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
---
This one incremental to patch already in mm-commits.
mm/memcontrol.c | 5 +++++
1 file changed, 5 insertions(+)
--- mm-commits/mm/memcontrol.c 2012-02-28 20:45:43.488100423 -0800
+++ linux/mm/memcontrol.c 2012-02-29 18:21:49.144702180 -0800
@@ -2953,6 +2953,11 @@ __mem_cgroup_uncharge_common(struct page
switch (ctype) {
case MEM_CGROUP_CHARGE_TYPE_MAPPED:
+ /*
+ * Generally PageAnon tells if it's the anon statistics to be
+ * updated; but sometimes e.g. mem_cgroup_uncharge_page() is
+ * used before page reached the stage of being marked PageAnon.
+ */
anon = true;
/* fallthrough */
case MEM_CGROUP_CHARGE_TYPE_DROP:
--
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