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/*
* 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/mmdebug.h>
struct hugetlb_cgroup;
/*
* Minimum page order trackable by hugetlb cgroup.
* At least 4 pages are necessary for all the tracking information.
* The second tail page (hpage[2]) is the fault usage cgroup.
* The third tail page (hpage[3]) is the reservation usage cgroup.
*/
#define HUGETLB_CGROUP_MIN_ORDER 2
#ifdef CONFIG_CGROUP_HUGETLB
static inline struct hugetlb_cgroup *
__hugetlb_cgroup_from_page(struct page *page, bool rsvd)
{
VM_BUG_ON_PAGE(!PageHuge(page), page);
if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
return NULL;
if (rsvd)
return (struct hugetlb_cgroup *)page[3].private;
else
return (struct hugetlb_cgroup *)page[2].private;
}
static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
{
return __hugetlb_cgroup_from_page(page, false);
}
static inline struct hugetlb_cgroup *
hugetlb_cgroup_from_page_rsvd(struct page *page)
{
return __hugetlb_cgroup_from_page(page, true);
}
static inline int __set_hugetlb_cgroup(struct page *page,
struct hugetlb_cgroup *h_cg, bool rsvd)
{
VM_BUG_ON_PAGE(!PageHuge(page), page);
if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
return -1;
if (rsvd)
page[3].private = (unsigned long)h_cg;
else
page[2].private = (unsigned long)h_cg;
return 0;
}
static inline int set_hugetlb_cgroup(struct page *page,
struct hugetlb_cgroup *h_cg)
{
return __set_hugetlb_cgroup(page, h_cg, false);
}
static inline int set_hugetlb_cgroup_rsvd(struct page *page,
struct hugetlb_cgroup *h_cg)
{
return __set_hugetlb_cgroup(page, h_cg, true);
}
static inline bool hugetlb_cgroup_disabled(void)
{
return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
}
extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr);
extern int hugetlb_cgroup_charge_cgroup_rsvd(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_commit_charge_rsvd(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_page_rsvd(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 void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg);
extern void hugetlb_cgroup_uncharge_counter(struct page_counter *p,
unsigned long nr_pages,
struct cgroup_subsys_state *css);
extern void hugetlb_cgroup_file_init(void) __init;
extern void hugetlb_cgroup_migrate(struct page *oldhpage,
struct page *newhpage);
#else
static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
{
return NULL;
}
static inline struct hugetlb_cgroup *
hugetlb_cgroup_from_page_resv(struct page *page)
{
return NULL;
}
static inline struct hugetlb_cgroup *
hugetlb_cgroup_from_page_rsvd(struct page *page)
{
return NULL;
}
static inline int set_hugetlb_cgroup(struct page *page,
struct hugetlb_cgroup *h_cg)
{
return 0;
}
static inline int set_hugetlb_cgroup_rsvd(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 int hugetlb_cgroup_charge_cgroup_rsvd(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)
{
}
static inline void
hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page)
{
}
static inline void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
struct page *page)
{
}
static inline void hugetlb_cgroup_uncharge_page_rsvd(int idx,
unsigned long nr_pages,
struct page *page)
{
}
static inline void hugetlb_cgroup_uncharge_cgroup(int idx,
unsigned long nr_pages,
struct hugetlb_cgroup *h_cg)
{
}
static inline void
hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg)
{
}
static inline void hugetlb_cgroup_file_init(void)
{
}
static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
struct page *newhpage)
{
}
#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
#endif
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