1 #ifndef __LINUX_PAGE_CGROUP_H
2 #define __LINUX_PAGE_CGROUP_H
5 /* flags for mem_cgroup */
6 PCG_USED
= 0x01, /* This page is charged to a memcg */
7 PCG_MEM
= 0x02, /* This page holds a memory charge */
8 PCG_MEMSW
= 0x04, /* This page holds a memory+swap charge */
17 * Page Cgroup can be considered as an extended mem_map.
18 * A page_cgroup page is associated with every page descriptor. The
19 * page_cgroup helps us identify information about the cgroup
20 * All page cgroups are allocated at boot or memory hotplug event,
21 * then the page cgroup for pfn always exists.
25 struct mem_cgroup
*mem_cgroup
;
28 extern void pgdat_page_cgroup_init(struct pglist_data
*pgdat
);
30 #ifdef CONFIG_SPARSEMEM
31 static inline void page_cgroup_init_flatmem(void)
34 extern void page_cgroup_init(void);
36 extern void page_cgroup_init_flatmem(void);
37 static inline void page_cgroup_init(void)
42 struct page_cgroup
*lookup_page_cgroup(struct page
*page
);
44 static inline int PageCgroupUsed(struct page_cgroup
*pc
)
46 return !!(pc
->flags
& PCG_USED
);
48 #else /* !CONFIG_MEMCG */
51 static inline void pgdat_page_cgroup_init(struct pglist_data
*pgdat
)
55 static inline struct page_cgroup
*lookup_page_cgroup(struct page
*page
)
60 static inline void page_cgroup_init(void)
64 static inline void page_cgroup_init_flatmem(void)
67 #endif /* CONFIG_MEMCG */
69 #include <linux/swap.h>
71 #ifdef CONFIG_MEMCG_SWAP
72 extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent
,
73 unsigned short old
, unsigned short new);
74 extern unsigned short swap_cgroup_record(swp_entry_t ent
, unsigned short id
);
75 extern unsigned short lookup_swap_cgroup_id(swp_entry_t ent
);
76 extern int swap_cgroup_swapon(int type
, unsigned long max_pages
);
77 extern void swap_cgroup_swapoff(int type
);
81 unsigned short swap_cgroup_record(swp_entry_t ent
, unsigned short id
)
87 unsigned short lookup_swap_cgroup_id(swp_entry_t ent
)
93 swap_cgroup_swapon(int type
, unsigned long max_pages
)
98 static inline void swap_cgroup_swapoff(int type
)
103 #endif /* CONFIG_MEMCG_SWAP */
105 #endif /* __LINUX_PAGE_CGROUP_H */