On Wed, 29 Feb 2012 18:42:57 -0800 (PST)
Hugh Dickins <hughd@xxxxxxxxxx> wrote:
> Add comment to MEM_CGROUP_CHARGE_TYPE_MAPPED case in
> __mem_cgroup_uncharge_common().
>
> Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> ---
> 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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