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

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Date:	Mon, 11 Jun 2012 15:15:46 +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 Mon 11-06-12 15:13:31, Aneesh Kumar K.V wrote:
> Michal Hocko <mhocko@...e.cz> writes:
> 
> > 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?
> 
> yes for most of the cgroups. But in the hugetlb case we have variable number
> of control files. We have the above set of control files for each
> hugetlb size supported by the architecture.

OK, understood.

> 
> -aneesh
> 
> --
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-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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