linux-kernel - Re: [PATCH] memcg: remove redundant code in mem_cgroup_force_empty

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Date:	Thu, 25 Jul 2013 10:02:05 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Cgroups <cgroups@...r.kernel.org>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] memcg: remove redundant code in
 mem_cgroup_force_empty_write()

On Thu 25-07-13 09:53:09, Li Zefan wrote:
> vfs guarantees the cgroup won't be destroyed, so it's redundant
> to get a css reference.
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>

Acked-by: Michal Hocko <mhocko@...e.cz>

Thanks!

> ---
>  mm/memcontrol.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 03c8bf7..aa3e478 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -5015,15 +5015,10 @@ static int mem_cgroup_force_empty(struct mem_cgroup *memcg)
>  static int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event)
>  {
>  	struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
> -	int ret;
>  
>  	if (mem_cgroup_is_root(memcg))
>  		return -EINVAL;
> -	css_get(&memcg->css);
> -	ret = mem_cgroup_force_empty(memcg);
> -	css_put(&memcg->css);
> -
> -	return ret;
> +	return mem_cgroup_force_empty(memcg);
>  }
>  
>  
> -- 
> 1.8.0.2

-- 
Michal Hocko
SUSE Labs
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