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Current File : //usr/src/kernels/3.10.0-957.5.1.el7.x86_64/include/linux/page_cgroup.h
#ifndef __LINUX_PAGE_CGROUP_H
#define __LINUX_PAGE_CGROUP_H

enum {
	/* flags for mem_cgroup */
	PCG_LOCK,  /* Lock for pc->mem_cgroup and following bits. */
	PCG_USED, /* this object is in use. */
	PCG_MIGRATION, /* under page migration */
	__NR_PCG_FLAGS,
};

#ifndef __GENERATING_BOUNDS_H
#include <generated/bounds.h>

#ifdef CONFIG_MEMCG
#include <linux/bit_spinlock.h>
#include <linux/page_ext.h>

/*
 * Page Cgroup can be considered as an extended mem_map.
 * A page_cgroup page is associated with every page descriptor. The
 * page_cgroup helps us identify information about the cgroup
 * All page cgroups are allocated at boot or memory hotplug event,
 * then the page cgroup for pfn always exists.
 */
struct page_cgroup {
	unsigned long flags;
	struct mem_cgroup *mem_cgroup;
#ifdef CONFIG_PAGE_EXTENSION
	struct page_ext ext;
#endif
};

void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat);

#ifdef CONFIG_SPARSEMEM
static inline void __init page_cgroup_init_flatmem(void)
{
}
extern void __init page_cgroup_init(void);
#else
void __init page_cgroup_init_flatmem(void);
static inline void __init page_cgroup_init(void)
{
}
#endif

struct page_cgroup *lookup_page_cgroup(struct page *page);
struct page *lookup_cgroup_page(struct page_cgroup *pc);

#define TESTPCGFLAG(uname, lname)			\
static inline int PageCgroup##uname(struct page_cgroup *pc)	\
	{ return test_bit(PCG_##lname, &pc->flags); }

#define SETPCGFLAG(uname, lname)			\
static inline void SetPageCgroup##uname(struct page_cgroup *pc)\
	{ set_bit(PCG_##lname, &pc->flags);  }

#define CLEARPCGFLAG(uname, lname)			\
static inline void ClearPageCgroup##uname(struct page_cgroup *pc)	\
	{ clear_bit(PCG_##lname, &pc->flags);  }

#define TESTCLEARPCGFLAG(uname, lname)			\
static inline int TestClearPageCgroup##uname(struct page_cgroup *pc)	\
	{ return test_and_clear_bit(PCG_##lname, &pc->flags);  }

TESTPCGFLAG(Used, USED)
CLEARPCGFLAG(Used, USED)
SETPCGFLAG(Used, USED)

SETPCGFLAG(Migration, MIGRATION)
CLEARPCGFLAG(Migration, MIGRATION)
TESTPCGFLAG(Migration, MIGRATION)

static inline void lock_page_cgroup(struct page_cgroup *pc)
{
	/*
	 * Don't take this lock in IRQ context.
	 * This lock is for pc->mem_cgroup, USED, MIGRATION
	 */
	bit_spin_lock(PCG_LOCK, &pc->flags);
}

static inline void unlock_page_cgroup(struct page_cgroup *pc)
{
	bit_spin_unlock(PCG_LOCK, &pc->flags);
}

#else /* CONFIG_MEMCG */
struct page_cgroup;

static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
{
}

static inline struct page_cgroup *lookup_page_cgroup(struct page *page)
{
	return NULL;
}

static inline void page_cgroup_init(void)
{
}

static inline void __init page_cgroup_init_flatmem(void)
{
}

#endif /* CONFIG_MEMCG */

#include <linux/swap.h>

#ifdef CONFIG_MEMCG_SWAP
extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
					unsigned short old, unsigned short new);
extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id);
extern unsigned short lookup_swap_cgroup_id(swp_entry_t ent);
extern int swap_cgroup_swapon(int type, unsigned long max_pages);
extern void swap_cgroup_swapoff(int type);
#else

static inline
unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
{
	return 0;
}

static inline
unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
{
	return 0;
}

static inline int
swap_cgroup_swapon(int type, unsigned long max_pages)
{
	return 0;
}

static inline void swap_cgroup_swapoff(int type)
{
	return;
}

#endif /* CONFIG_MEMCG_SWAP */

#endif /* !__GENERATING_BOUNDS_H */

#endif /* __LINUX_PAGE_CGROUP_H */

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