[deliverable/linux.git] / include / linux / hugetlb_cgroup.h

/*
 * Copyright IBM Corporation, 2012
 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2.1 of the GNU Lesser General Public License
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 */

#ifndef _LINUX_HUGETLB_CGROUP_H
#define _LINUX_HUGETLB_CGROUP_H

#include <linux/res_counter.h>

struct hugetlb_cgroup;
/*
 * Minimum page order trackable by hugetlb cgroup.
 * At least 3 pages are necessary for all the tracking information.
 */
#define HUGETLB_CGROUP_MIN_ORDER	2

#ifdef CONFIG_CGROUP_HUGETLB

static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
{
	VM_BUG_ON(!PageHuge(page));

	if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
		return NULL;
	return (struct hugetlb_cgroup *)page[2].lru.next;
}

static inline
int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
{
	VM_BUG_ON(!PageHuge(page));

	if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
		return -1;
	page[2].lru.next = (void *)h_cg;
	return 0;
}

static inline bool hugetlb_cgroup_disabled(void)
{
	if (hugetlb_subsys.disabled)
		return true;
	return false;
}

extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
					struct hugetlb_cgroup **ptr);
extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
					 struct hugetlb_cgroup *h_cg,
					 struct page *page);
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)
{
	return NULL;
}

static inline
int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
{
	return 0;
}

static inline bool hugetlb_cgroup_disabled(void)
{
	return true;
}

static inline int
hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
			     struct hugetlb_cgroup **ptr)
{
	return 0;
}

static inline void
hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
			     struct hugetlb_cgroup *h_cg,
			     struct page *page)
{
	return;
}

static inline void
hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
{
	return;
}

static inline void
hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
			       struct hugetlb_cgroup *h_cg)
{
	return;
}

static inline int __init hugetlb_cgroup_file_init(int idx)
{
	return 0;
}

#endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
#endif
Commit	Line	Data
2bc64a20 AK	1	/*
	2	* Copyright IBM Corporation, 2012
	3	* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of version 2.1 of the GNU Lesser General Public License
	7	* as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it would be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	12	*
	13	*/
	14
	15	#ifndef _LINUX_HUGETLB_CGROUP_H
	16	#define _LINUX_HUGETLB_CGROUP_H
	17
	18	#include <linux/res_counter.h>
	19
	20	struct hugetlb_cgroup;
9dd540e2 AK	21	/*
	22	* Minimum page order trackable by hugetlb cgroup.
	23	* At least 3 pages are necessary for all the tracking information.
	24	*/
	25	#define HUGETLB_CGROUP_MIN_ORDER 2
2bc64a20 AK	26
2bc64a20 AK	27	#ifdef CONFIG_CGROUP_HUGETLB
9dd540e2 AK	28
	29	static inline struct hugetlb_cgroup hugetlb_cgroup_from_page(struct page page)
	30	{
	31	VM_BUG_ON(!PageHuge(page));
	32
	33	if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
	34	return NULL;
	35	return (struct hugetlb_cgroup *)page[2].lru.next;
	36	}
	37
	38	static inline
	39	int set_hugetlb_cgroup(struct page page, struct hugetlb_cgroup h_cg)
	40	{
	41	VM_BUG_ON(!PageHuge(page));
	42
	43	if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
	44	return -1;
	45	page[2].lru.next = (void *)h_cg;
	46	return 0;
	47	}
	48
2bc64a20 AK	49	static inline bool hugetlb_cgroup_disabled(void)
	50	{
	51	if (hugetlb_subsys.disabled)
	52	return true;
	53	return false;
	54	}
	55
6d76dcf4 AK	56	extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
	57	struct hugetlb_cgroup **ptr);
	58	extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
	59	struct hugetlb_cgroup *h_cg,
	60	struct page *page);
	61	extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
	62	struct page *page);
	63	extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
	64	struct hugetlb_cgroup *h_cg);
abb8206c	65	extern int hugetlb_cgroup_file_init(int idx) __init;
6d76dcf4	66
2bc64a20	67	#else
9dd540e2 AK	68	static inline struct hugetlb_cgroup hugetlb_cgroup_from_page(struct page page)
	69	{
	70	return NULL;
	71	}
	72
	73	static inline
	74	int set_hugetlb_cgroup(struct page page, struct hugetlb_cgroup h_cg)
	75	{
	76	return 0;
	77	}
	78
2bc64a20 AK	79	static inline bool hugetlb_cgroup_disabled(void)
	80	{
	81	return true;
	82	}
	83
6d76dcf4 AK	84	static inline int
	85	hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
	86	struct hugetlb_cgroup **ptr)
	87	{
	88	return 0;
	89	}
	90
	91	static inline void
	92	hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
	93	struct hugetlb_cgroup *h_cg,
	94	struct page *page)
	95	{
	96	return;
	97	}
	98
	99	static inline void
	100	hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
	101	{
	102	return;
	103	}
	104
	105	static inline void
	106	hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
	107	struct hugetlb_cgroup *h_cg)
	108	{
	109	return;
	110	}
	111
abb8206c AK	112	static inline int __init hugetlb_cgroup_file_init(int idx)
	113	{
	114	return 0;
	115	}
	116
2bc64a20 AK	117	#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
2bc64a20 AK	118	#endif