On Sat 14-12-13 12:15:33, Vladimir Davydov wrote:
> The mem_cgroup structure contains nr_node_ids pointers to
> mem_cgroup_per_node objects, not the objects themselves.
Ouch! This is 2k per node which is wasted. What a shame I haven't
noticed this back then when reviewing 45cf7ebd5a033 (memcg: reduce the
size of struct memcg 244-fold)
> Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxx>
> Cc: Glauber Costa <glommer@xxxxxxxxxx>
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: Balbir Singh <bsingharora@xxxxxxxxx>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
Thanks!
> ---
> mm/memcontrol.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index bf5e894..7f1a356 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -338,7 +338,7 @@ struct mem_cgroup {
> static size_t memcg_size(void)
> {
> return sizeof(struct mem_cgroup) +
> - nr_node_ids * sizeof(struct mem_cgroup_per_node);
> + nr_node_ids * sizeof(struct mem_cgroup_per_node *);
> }
>
> /* internal only representation about the status of kmem accounting. */
> --
> 1.7.10.4
>
--
Michal Hocko
SUSE Labs
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