linux-kernel - Re: [RFC][PATCH 2/7] memcg: don't use mem_cgroup

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Date:	Fri, 05 Apr 2013 14:51:10 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizefan@...wei.com>
CC:	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Glauber Costa <glommer@...allels.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [RFC][PATCH 2/7] memcg: don't use mem_cgroup_get() when creating
 a kmemcg cache

(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@...wei.com>
> ---
>   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

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