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- #ifndef __LINUX_PAGE_CGROUP_H
- #define __LINUX_PAGE_CGROUP_H
-
- #ifdef CONFIG_CGROUP_MEM_RES_CTLR
- #include <linux/bit_spinlock.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;
- struct page *page;
- struct list_head lru; /* per cgroup LRU list */
- };
-
- void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat);
- void __init page_cgroup_init(void);
- struct page_cgroup *lookup_page_cgroup(struct page *page);
-
- enum {
- /* flags for mem_cgroup */
- PCG_LOCK, /* page cgroup is locked */
- PCG_CACHE, /* charged as cache */
- PCG_USED, /* this object is in use. */
- /* flags for LRU placement */
- PCG_ACTIVE, /* page is active in this cgroup */
- PCG_FILE, /* page is file system backed */
- PCG_UNEVICTABLE, /* page is unevictableable */
- };
-
- #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); }
-
- /* Cache flag is set only once (at allocation) */
- TESTPCGFLAG(Cache, CACHE)
-
- TESTPCGFLAG(Used, USED)
- CLEARPCGFLAG(Used, USED)
-
- /* LRU management flags (from global-lru definition) */
- TESTPCGFLAG(File, FILE)
- SETPCGFLAG(File, FILE)
- CLEARPCGFLAG(File, FILE)
-
- TESTPCGFLAG(Active, ACTIVE)
- SETPCGFLAG(Active, ACTIVE)
- CLEARPCGFLAG(Active, ACTIVE)
-
- TESTPCGFLAG(Unevictable, UNEVICTABLE)
- SETPCGFLAG(Unevictable, UNEVICTABLE)
- CLEARPCGFLAG(Unevictable, UNEVICTABLE)
-
- static inline int page_cgroup_nid(struct page_cgroup *pc)
- {
- return page_to_nid(pc->page);
- }
-
- static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc)
- {
- return page_zonenum(pc->page);
- }
-
- static inline void lock_page_cgroup(struct page_cgroup *pc)
- {
- bit_spin_lock(PCG_LOCK, &pc->flags);
- }
-
- static inline int trylock_page_cgroup(struct page_cgroup *pc)
- {
- return bit_spin_trylock(PCG_LOCK, &pc->flags);
- }
-
- static inline void unlock_page_cgroup(struct page_cgroup *pc)
- {
- bit_spin_unlock(PCG_LOCK, &pc->flags);
- }
-
- #else /* CONFIG_CGROUP_MEM_RES_CTLR */
- 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)
- {
- }
-
- #endif
- #endif
-