219 lines
5.6 KiB
C
219 lines
5.6 KiB
C
#ifndef __LINUX_PAGE_CGROUP_H
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#define __LINUX_PAGE_CGROUP_H
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enum {
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/* flags for mem_cgroup */
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PCG_LOCK, /* Lock for pc->mem_cgroup and following bits. */
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PCG_CACHE, /* charged as cache */
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PCG_USED, /* this object is in use. */
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PCG_MIGRATION, /* under page migration */
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/* flags for mem_cgroup and file and I/O status */
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PCG_MOVE_LOCK, /* For race between move_account v.s. following bits */
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PCG_FILE_MAPPED, /* page is accounted as "mapped" */
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/* No lock in page_cgroup */
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PCG_ACCT_LRU, /* page has been accounted for (under lru_lock) */
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__NR_PCG_FLAGS,
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};
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#ifndef __GENERATING_BOUNDS_H
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#include <generated/bounds.h>
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#ifdef CONFIG_CGROUP_MEM_RES_CTLR
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#include <linux/bit_spinlock.h>
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/*
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* Page Cgroup can be considered as an extended mem_map.
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* A page_cgroup page is associated with every page descriptor. The
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* page_cgroup helps us identify information about the cgroup
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* All page cgroups are allocated at boot or memory hotplug event,
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* then the page cgroup for pfn always exists.
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*/
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struct page_cgroup {
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unsigned long flags;
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struct mem_cgroup *mem_cgroup;
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struct list_head lru; /* per cgroup LRU list */
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};
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void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat);
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#ifdef CONFIG_SPARSEMEM
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static inline void __init page_cgroup_init_flatmem(void)
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{
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}
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extern void __init page_cgroup_init(void);
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#else
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void __init page_cgroup_init_flatmem(void);
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static inline void __init page_cgroup_init(void)
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{
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}
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#endif
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struct page_cgroup *lookup_page_cgroup(struct page *page);
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struct page *lookup_cgroup_page(struct page_cgroup *pc);
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#define TESTPCGFLAG(uname, lname) \
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static inline int PageCgroup##uname(struct page_cgroup *pc) \
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{ return test_bit(PCG_##lname, &pc->flags); }
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#define SETPCGFLAG(uname, lname) \
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static inline void SetPageCgroup##uname(struct page_cgroup *pc)\
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{ set_bit(PCG_##lname, &pc->flags); }
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#define CLEARPCGFLAG(uname, lname) \
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static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \
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{ clear_bit(PCG_##lname, &pc->flags); }
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#define TESTCLEARPCGFLAG(uname, lname) \
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static inline int TestClearPageCgroup##uname(struct page_cgroup *pc) \
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{ return test_and_clear_bit(PCG_##lname, &pc->flags); }
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/* Cache flag is set only once (at allocation) */
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TESTPCGFLAG(Cache, CACHE)
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CLEARPCGFLAG(Cache, CACHE)
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SETPCGFLAG(Cache, CACHE)
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TESTPCGFLAG(Used, USED)
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CLEARPCGFLAG(Used, USED)
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SETPCGFLAG(Used, USED)
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SETPCGFLAG(AcctLRU, ACCT_LRU)
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CLEARPCGFLAG(AcctLRU, ACCT_LRU)
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TESTPCGFLAG(AcctLRU, ACCT_LRU)
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TESTCLEARPCGFLAG(AcctLRU, ACCT_LRU)
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SETPCGFLAG(FileMapped, FILE_MAPPED)
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CLEARPCGFLAG(FileMapped, FILE_MAPPED)
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TESTPCGFLAG(FileMapped, FILE_MAPPED)
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SETPCGFLAG(Migration, MIGRATION)
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CLEARPCGFLAG(Migration, MIGRATION)
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TESTPCGFLAG(Migration, MIGRATION)
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static inline void lock_page_cgroup(struct page_cgroup *pc)
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{
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/*
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* Don't take this lock in IRQ context.
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* This lock is for pc->mem_cgroup, USED, CACHE, MIGRATION
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*/
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bit_spin_lock(PCG_LOCK, &pc->flags);
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}
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static inline void unlock_page_cgroup(struct page_cgroup *pc)
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{
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bit_spin_unlock(PCG_LOCK, &pc->flags);
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}
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static inline void move_lock_page_cgroup(struct page_cgroup *pc,
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unsigned long *flags)
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{
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/*
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* We know updates to pc->flags of page cache's stats are from both of
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* usual context or IRQ context. Disable IRQ to avoid deadlock.
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*/
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local_irq_save(*flags);
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bit_spin_lock(PCG_MOVE_LOCK, &pc->flags);
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}
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static inline void move_unlock_page_cgroup(struct page_cgroup *pc,
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unsigned long *flags)
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{
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bit_spin_unlock(PCG_MOVE_LOCK, &pc->flags);
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local_irq_restore(*flags);
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}
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#ifdef CONFIG_SPARSEMEM
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#define PCG_ARRAYID_WIDTH SECTIONS_SHIFT
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#else
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#define PCG_ARRAYID_WIDTH NODES_SHIFT
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#endif
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#if (PCG_ARRAYID_WIDTH > BITS_PER_LONG - NR_PCG_FLAGS)
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#error Not enough space left in pc->flags to store page_cgroup array IDs
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#endif
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/* pc->flags: ARRAY-ID | FLAGS */
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#define PCG_ARRAYID_MASK ((1UL << PCG_ARRAYID_WIDTH) - 1)
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#define PCG_ARRAYID_OFFSET (BITS_PER_LONG - PCG_ARRAYID_WIDTH)
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/*
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* Zero the shift count for non-existent fields, to prevent compiler
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* warnings and ensure references are optimized away.
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*/
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#define PCG_ARRAYID_SHIFT (PCG_ARRAYID_OFFSET * (PCG_ARRAYID_WIDTH != 0))
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static inline void set_page_cgroup_array_id(struct page_cgroup *pc,
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unsigned long id)
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{
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pc->flags &= ~(PCG_ARRAYID_MASK << PCG_ARRAYID_SHIFT);
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pc->flags |= (id & PCG_ARRAYID_MASK) << PCG_ARRAYID_SHIFT;
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}
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static inline unsigned long page_cgroup_array_id(struct page_cgroup *pc)
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{
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return (pc->flags >> PCG_ARRAYID_SHIFT) & PCG_ARRAYID_MASK;
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}
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#else /* CONFIG_CGROUP_MEM_RES_CTLR */
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struct page_cgroup;
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static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
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{
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}
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static inline struct page_cgroup *lookup_page_cgroup(struct page *page)
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{
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return NULL;
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}
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static inline void page_cgroup_init(void)
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{
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}
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static inline void __init page_cgroup_init_flatmem(void)
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{
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}
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#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
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#include <linux/swap.h>
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#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
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extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
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unsigned short old, unsigned short new);
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extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id);
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extern unsigned short lookup_swap_cgroup(swp_entry_t ent);
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extern int swap_cgroup_swapon(int type, unsigned long max_pages);
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extern void swap_cgroup_swapoff(int type);
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#else
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static inline
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unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
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{
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return 0;
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}
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static inline
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unsigned short lookup_swap_cgroup(swp_entry_t ent)
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{
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return 0;
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}
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static inline int
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swap_cgroup_swapon(int type, unsigned long max_pages)
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{
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return 0;
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}
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static inline void swap_cgroup_swapoff(int type)
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{
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return;
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}
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#endif /* CONFIG_CGROUP_MEM_RES_CTLR_SWAP */
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#endif /* !__GENERATING_BOUNDS_H */
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#endif /* __LINUX_PAGE_CGROUP_H */
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