#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); #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); enum { /* flags for mem_cgroup */ PCG_LOCK, /* page cgroup is locked */ PCG_CACHE, /* charged as cache */ PCG_USED, /* this object is in use. */ PCG_ACCT_LRU, /* page has been accounted for */ }; #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); } /* Cache flag is set only once (at allocation) */ TESTPCGFLAG(Cache, CACHE) CLEARPCGFLAG(Cache, CACHE) SETPCGFLAG(Cache, CACHE) TESTPCGFLAG(Used, USED) CLEARPCGFLAG(Used, USED) SETPCGFLAG(Used, USED) SETPCGFLAG(AcctLRU, ACCT_LRU) CLEARPCGFLAG(AcctLRU, ACCT_LRU) TESTPCGFLAG(AcctLRU, ACCT_LRU) TESTCLEARPCGFLAG(AcctLRU, ACCT_LRU) 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) { } static inline void __init page_cgroup_init_flatmem(void) { } #endif #include <linux/swap.h> #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id); extern unsigned short lookup_swap_cgroup(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(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 #endif