Commit abb8206c authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Linus Torvalds
Browse files

hugetlb/cgroup: add hugetlb cgroup control files 



Add the control files for hugetlb controller

[akpm@linux-foundation.org: s/CONFIG_CGROUP_HUGETLB_RES_CTLR/CONFIG_MEMCG_HUGETLB/g]
[akpm@linux-foundation.org: s/CONFIG_MEMCG_HUGETLB/CONFIG_CGROUP_HUGETLB/]
Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Acked-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Reviewed-by: default avatarMichal Hocko <mhocko@suse.cz>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent da1def55

include/linux/hugetlb.h

+5 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 
#include <linux/mm_types.h>

#include <linux/fs.h>

#include <linux/hugetlb_inline.h>

#include <linux/cgroup.h>



struct ctl_table;

struct user_struct;
@@ -221,6 +222,10 @@ struct hstate { 
	unsigned int nr_huge_pages_node[MAX_NUMNODES];

	unsigned int free_huge_pages_node[MAX_NUMNODES];

	unsigned int surplus_huge_pages_node[MAX_NUMNODES];

#ifdef CONFIG_CGROUP_HUGETLB

	/* cgroup control files */

	struct cftype cgroup_files[5];

#endif

	char name[HSTATE_NAME_LEN];

};

include/linux/hugetlb_cgroup.h

+6 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, 
					 struct page *page);

extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,

					   struct hugetlb_cgroup *h_cg);

extern int hugetlb_cgroup_file_init(int idx) __init;



#else

static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
@@ -108,5 +109,10 @@ hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, 
	return;

}



static inline int __init hugetlb_cgroup_file_init(int idx)

{

	return 0;

}



#endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */

#endif

mm/hugetlb.c

+8 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#include <linux/hugetlb.h>

#include <linux/hugetlb_cgroup.h>

#include <linux/node.h>

#include <linux/hugetlb_cgroup.h>

#include "internal.h"



const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL;
@@ -1930,6 +1931,13 @@ void __init hugetlb_add_hstate(unsigned order) 
	h->next_nid_to_free = first_node(node_states[N_HIGH_MEMORY]);

	snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB",

					huge_page_size(h)/1024);

	/*

	 * Add cgroup control files only if the huge page consists

	 * of more than two normal pages. This is because we use

	 * page[2].lru.next for storing cgoup details.

	 */

	if (order >= HUGETLB_CGROUP_MIN_ORDER)

		hugetlb_cgroup_file_init(hugetlb_max_hstate - 1);



	parsed_hstate = h;

}

mm/hugetlb_cgroup.c

+129 −0
Original line number Diff line number Diff line
@@ -26,6 +26,10 @@ struct hugetlb_cgroup { 
	struct res_counter hugepage[HUGE_MAX_HSTATE];

};



#define MEMFILE_PRIVATE(x, val)	(((x) << 16) | (val))

#define MEMFILE_IDX(val)	(((val) >> 16) & 0xffff)

#define MEMFILE_ATTR(val)	((val) & 0xffff)



struct cgroup_subsys hugetlb_subsys __read_mostly;

static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
@@ -257,6 +261,131 @@ void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, 
	return;

}



static ssize_t hugetlb_cgroup_read(struct cgroup *cgroup, struct cftype *cft,

				   struct file *file, char __user *buf,

				   size_t nbytes, loff_t *ppos)

{

	u64 val;

	char str[64];

	int idx, name, len;

	struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);



	idx = MEMFILE_IDX(cft->private);

	name = MEMFILE_ATTR(cft->private);



	val = res_counter_read_u64(&h_cg->hugepage[idx], name);

	len = scnprintf(str, sizeof(str), "%llu\n", (unsigned long long)val);

	return simple_read_from_buffer(buf, nbytes, ppos, str, len);

}



static int hugetlb_cgroup_write(struct cgroup *cgroup, struct cftype *cft,

				const char *buffer)

{

	int idx, name, ret;

	unsigned long long val;

	struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);



	idx = MEMFILE_IDX(cft->private);

	name = MEMFILE_ATTR(cft->private);



	switch (name) {

	case RES_LIMIT:

		if (hugetlb_cgroup_is_root(h_cg)) {

			/* Can't set limit on root */

			ret = -EINVAL;

			break;

		}

		/* This function does all necessary parse...reuse it */

		ret = res_counter_memparse_write_strategy(buffer, &val);

		if (ret)

			break;

		ret = res_counter_set_limit(&h_cg->hugepage[idx], val);

		break;

	default:

		ret = -EINVAL;

		break;

	}

	return ret;

}



static int hugetlb_cgroup_reset(struct cgroup *cgroup, unsigned int event)

{

	int idx, name, ret = 0;

	struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);



	idx = MEMFILE_IDX(event);

	name = MEMFILE_ATTR(event);



	switch (name) {

	case RES_MAX_USAGE:

		res_counter_reset_max(&h_cg->hugepage[idx]);

		break;

	case RES_FAILCNT:

		res_counter_reset_failcnt(&h_cg->hugepage[idx]);

		break;

	default:

		ret = -EINVAL;

		break;

	}

	return ret;

}



static char *mem_fmt(char *buf, int size, unsigned long hsize)

{

	if (hsize >= (1UL << 30))

		snprintf(buf, size, "%luGB", hsize >> 30);

	else if (hsize >= (1UL << 20))

		snprintf(buf, size, "%luMB", hsize >> 20);

	else

		snprintf(buf, size, "%luKB", hsize >> 10);

	return buf;

}



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;

}



struct cgroup_subsys hugetlb_subsys = {

	.name = "hugetlb",

	.create     = hugetlb_cgroup_create,

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