hugetlb_cgroup.h

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/*
 * Copyright IBM Corporation, 2012
 * Author Aneesh Kumar K.V <[email protected]>
 *
 * 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;
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
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;
}

static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
                      struct page *newhpage)
{
    return;
}

#endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
#endif