Re: [RFC][PATCH 2/7] memcg: don't use mem_cgroup_get() when creating a kmemcg cache

Kamezawa Hiroyuki
2013-04-05T05:51:10Z

(2013/04/03 18:12), Li Zefan wrote:
> Use css_get()/css_put() instead of mem_cgroup_get()/mem_cgroup_put().
>
> Signed-off-by: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
> ---
> mm/memcontrol.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 43ca91d..dafacb8 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3191,7 +3191,7 @@ void memcg_release_cache(struct kmem_cache *s)
> list_del(&s->memcg_params->list);
> mutex_unlock(&memcg->slab_caches_mutex);
>
> - mem_cgroup_put(memcg);
> + css_put(&memcg->css);
> out:
> kfree(s->memcg_params);
> }
> @@ -3350,16 +3350,18 @@ static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
>
> mutex_lock(&memcg_cache_mutex);
> new_cachep = cachep->memcg_params->memcg_caches[idx];
> - if (new_cachep)
> + if (new_cachep) {
> + css_put(&memcg->css);
> goto out;
> + }

Where css_get() against this is done ?

Thanks,
-Kame