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Date: Tue, 6 Aug 2013 10:02:36 +0800
From: Li Zefan <lizefan@huawei.com>
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To: Tejun Heo <tj@kernel.org>
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        <kamezawa.hiroyu@jp.fujitsu.com>, <cgroups@vger.kernel.org>,
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Subject: Re: [PATCH v2 3/5] cgroup, memcg: move cgroup_event implementation
 to memcg
References: <1375632446-2581-1-git-send-email-tj@kernel.org> <1375632446-2581-4-git-send-email-tj@kernel.org> <20130805170928.GB23751@mtj.dyndns.org>
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>  static struct cftype mem_cgroup_files[] = {
>  	{
>  		.name = "usage_in_bytes",
> @@ -5973,6 +6192,12 @@ static struct cftype mem_cgroup_files[] = {
>  		.read_u64 = mem_cgroup_hierarchy_read,
>  	},
>  	{
> +		.name = "cgroup.event_control",
> +		.write_string = cgroup_write_event_control,
> +		.flags = CFTYPE_NO_PREFIX,
> +		.mode = S_IWUGO,
> +	},

One of the misdesign of cgroup eventfd is, cgroup.event_control is
totally redunant...