linux-kernel - Re: [PATCH v3 04/13] kmem accounting basic infrastructure

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Message-ID: <20120921163404.GC7264@google.com>
Date:	Fri, 21 Sep 2012 09:34:04 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com, devel@...nvz.org,
	linux-mm@...ck.org, Suleiman Souhlal <suleiman@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v3 04/13] kmem accounting basic infrastructure

On Tue, Sep 18, 2012 at 06:04:01PM +0400, Glauber Costa wrote:
>  #ifdef CONFIG_MEMCG_KMEM
> +static struct cftype kmem_cgroup_files[] = {
> +	{
> +		.name = "kmem.limit_in_bytes",
> +		.private = MEMFILE_PRIVATE(_KMEM, RES_LIMIT),
> +		.write_string = mem_cgroup_write,
> +		.read = mem_cgroup_read,
> +	},
> +	{
> +		.name = "kmem.usage_in_bytes",
> +		.private = MEMFILE_PRIVATE(_KMEM, RES_USAGE),
> +		.read = mem_cgroup_read,
> +	},
> +	{
> +		.name = "kmem.failcnt",
> +		.private = MEMFILE_PRIVATE(_KMEM, RES_FAILCNT),
> +		.trigger = mem_cgroup_reset,
> +		.read = mem_cgroup_read,
> +	},
> +	{
> +		.name = "kmem.max_usage_in_bytes",
> +		.private = MEMFILE_PRIVATE(_KMEM, RES_MAX_USAGE),
> +		.trigger = mem_cgroup_reset,
> +		.read = mem_cgroup_read,
> +	},
> +	{},
> +};
> +
>  static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
>  {
>  	return mem_cgroup_sockets_init(memcg, ss);
> @@ -4961,6 +5015,12 @@ mem_cgroup_create(struct cgroup *cont)
>  		int cpu;
>  		enable_swap_cgroup();
>  		parent = NULL;
> +
> +#ifdef CONFIG_MEMCG_KMEM
> +		WARN_ON(cgroup_add_cftypes(&mem_cgroup_subsys,
> +					   kmem_cgroup_files));
> +#endif
> +

Why not just make it part of mem_cgroup_files[]?

Thanks.

-- 
tejun
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