linux-kernel - Re: [PATCH -V8 13/16] hugetlb/cgroup: add hugetlb cgroup control files

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Message-ID: <20120611090234.GE12402@tiehlicka.suse.cz>
Date:	Mon, 11 Jun 2012 11:02:34 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, kamezawa.hiroyu@...fujitsu.com,
	dhillf@...il.com, rientjes@...gle.com, akpm@...ux-foundation.org,
	hannes@...xchg.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: Re: [PATCH -V8 13/16] hugetlb/cgroup: add hugetlb cgroup control
 files

On Sat 09-06-12 14:29:58, Aneesh Kumar K.V wrote:
> From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> 
> Add the control files for hugetlb controller
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> ---
[...]
> +int __init hugetlb_cgroup_file_init(int idx)
> +{
> +	char buf[32];
> +	struct cftype *cft;
> +	struct hstate *h = &hstates[idx];
> +
> +	/* format the size */
> +	mem_fmt(buf, 32, huge_page_size(h));
> +
> +	/* Add the limit file */
> +	cft = &h->cgroup_files[0];
> +	snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf);
> +	cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT);
> +	cft->read = hugetlb_cgroup_read;
> +	cft->write_string = hugetlb_cgroup_write;
> +
> +	/* Add the usage file */
> +	cft = &h->cgroup_files[1];
> +	snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf);
> +	cft->private = MEMFILE_PRIVATE(idx, RES_USAGE);
> +	cft->read = hugetlb_cgroup_read;
> +
> +	/* Add the MAX usage file */
> +	cft = &h->cgroup_files[2];
> +	snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf);
> +	cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE);
> +	cft->trigger = hugetlb_cgroup_reset;
> +	cft->read = hugetlb_cgroup_read;
> +
> +	/* Add the failcntfile */
> +	cft = &h->cgroup_files[3];
> +	snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf);
> +	cft->private  = MEMFILE_PRIVATE(idx, RES_FAILCNT);
> +	cft->trigger  = hugetlb_cgroup_reset;
> +	cft->read = hugetlb_cgroup_read;
> +
> +	/* NULL terminate the last cft */
> +	cft = &h->cgroup_files[4];
> +	memset(cft, 0, sizeof(*cft));
> +
> +	WARN_ON(cgroup_add_cftypes(&hugetlb_subsys, h->cgroup_files));
> +
> +	return 0;
> +}
> +

I am not so familiar with the recent changes in the generic cgroup
infrastructure but isn't this somehow automated?
-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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