diff options
Diffstat (limited to 'ANDROID_3.4.5/include/linux/swap.h')
| -rw-r--r-- | ANDROID_3.4.5/include/linux/swap.h | 512 |
1 files changed, 0 insertions, 512 deletions
diff --git a/ANDROID_3.4.5/include/linux/swap.h b/ANDROID_3.4.5/include/linux/swap.h deleted file mode 100644 index b1fd5c79..00000000 --- a/ANDROID_3.4.5/include/linux/swap.h +++ /dev/null @@ -1,512 +0,0 @@ -#ifndef _LINUX_SWAP_H -#define _LINUX_SWAP_H - -#include <linux/spinlock.h> -#include <linux/linkage.h> -#include <linux/mmzone.h> -#include <linux/list.h> -#include <linux/memcontrol.h> -#include <linux/sched.h> -#include <linux/node.h> - -#include <linux/atomic.h> -#include <asm/page.h> - -struct notifier_block; - -struct bio; - -#define SWAP_FLAG_PREFER 0x8000 /* set if swap priority specified */ -#define SWAP_FLAG_PRIO_MASK 0x7fff -#define SWAP_FLAG_PRIO_SHIFT 0 -#define SWAP_FLAG_DISCARD 0x10000 /* discard swap cluster after use */ - -#define SWAP_FLAGS_VALID (SWAP_FLAG_PRIO_MASK | SWAP_FLAG_PREFER | \ - SWAP_FLAG_DISCARD) - -static inline int current_is_kswapd(void) -{ - return current->flags & PF_KSWAPD; -} - -/* - * MAX_SWAPFILES defines the maximum number of swaptypes: things which can - * be swapped to. The swap type and the offset into that swap type are - * encoded into pte's and into pgoff_t's in the swapcache. Using five bits - * for the type means that the maximum number of swapcache pages is 27 bits - * on 32-bit-pgoff_t architectures. And that assumes that the architecture packs - * the type/offset into the pte as 5/27 as well. - */ -#define MAX_SWAPFILES_SHIFT 5 - -/* - * Use some of the swap files numbers for other purposes. This - * is a convenient way to hook into the VM to trigger special - * actions on faults. - */ - -/* - * NUMA node memory migration support - */ -#ifdef CONFIG_MIGRATION -#define SWP_MIGRATION_NUM 2 -#define SWP_MIGRATION_READ (MAX_SWAPFILES + SWP_HWPOISON_NUM) -#define SWP_MIGRATION_WRITE (MAX_SWAPFILES + SWP_HWPOISON_NUM + 1) -#else -#define SWP_MIGRATION_NUM 0 -#endif - -/* - * Handling of hardware poisoned pages with memory corruption. - */ -#ifdef CONFIG_MEMORY_FAILURE -#define SWP_HWPOISON_NUM 1 -#define SWP_HWPOISON MAX_SWAPFILES -#else -#define SWP_HWPOISON_NUM 0 -#endif - -#define MAX_SWAPFILES \ - ((1 << MAX_SWAPFILES_SHIFT) - SWP_MIGRATION_NUM - SWP_HWPOISON_NUM) - -/* - * Magic header for a swap area. The first part of the union is - * what the swap magic looks like for the old (limited to 128MB) - * swap area format, the second part of the union adds - in the - * old reserved area - some extra information. Note that the first - * kilobyte is reserved for boot loader or disk label stuff... - * - * Having the magic at the end of the PAGE_SIZE makes detecting swap - * areas somewhat tricky on machines that support multiple page sizes. - * For 2.5 we'll probably want to move the magic to just beyond the - * bootbits... - */ -union swap_header { - struct { - char reserved[PAGE_SIZE - 10]; - char magic[10]; /* SWAP-SPACE or SWAPSPACE2 */ - } magic; - struct { - char bootbits[1024]; /* Space for disklabel etc. */ - __u32 version; - __u32 last_page; - __u32 nr_badpages; - unsigned char sws_uuid[16]; - unsigned char sws_volume[16]; - __u32 padding[117]; - __u32 badpages[1]; - } info; -}; - - /* A swap entry has to fit into a "unsigned long", as - * the entry is hidden in the "index" field of the - * swapper address space. - */ -typedef struct { - unsigned long val; -} swp_entry_t; - -/* - * current->reclaim_state points to one of these when a task is running - * memory reclaim - */ -struct reclaim_state { - unsigned long reclaimed_slab; -}; - -#ifdef __KERNEL__ - -struct address_space; -struct sysinfo; -struct writeback_control; -struct zone; - -/* - * A swap extent maps a range of a swapfile's PAGE_SIZE pages onto a range of - * disk blocks. A list of swap extents maps the entire swapfile. (Where the - * term `swapfile' refers to either a blockdevice or an IS_REG file. Apart - * from setup, they're handled identically. - * - * We always assume that blocks are of size PAGE_SIZE. - */ -struct swap_extent { - struct list_head list; - pgoff_t start_page; - pgoff_t nr_pages; - sector_t start_block; -}; - -/* - * Max bad pages in the new format.. - */ -#define __swapoffset(x) ((unsigned long)&((union swap_header *)0)->x) -#define MAX_SWAP_BADPAGES \ - ((__swapoffset(magic.magic) - __swapoffset(info.badpages)) / sizeof(int)) - -enum { - SWP_USED = (1 << 0), /* is slot in swap_info[] used? */ - SWP_WRITEOK = (1 << 1), /* ok to write to this swap? */ - SWP_DISCARDABLE = (1 << 2), /* swapon+blkdev support discard */ - SWP_DISCARDING = (1 << 3), /* now discarding a free cluster */ - SWP_SOLIDSTATE = (1 << 4), /* blkdev seeks are cheap */ - SWP_CONTINUED = (1 << 5), /* swap_map has count continuation */ - SWP_BLKDEV = (1 << 6), /* its a block device */ - /* add others here before... */ - SWP_SCANNING = (1 << 8), /* refcount in scan_swap_map */ -}; - -#define SWAP_CLUSTER_MAX 32 -#define COMPACT_CLUSTER_MAX SWAP_CLUSTER_MAX - -/* - * Ratio between the present memory in the zone and the "gap" that - * we're allowing kswapd to shrink in addition to the per-zone high - * wmark, even for zones that already have the high wmark satisfied, - * in order to provide better per-zone lru behavior. We are ok to - * spend not more than 1% of the memory for this zone balancing "gap". - */ -#define KSWAPD_ZONE_BALANCE_GAP_RATIO 100 - -#define SWAP_MAP_MAX 0x3e /* Max duplication count, in first swap_map */ -#define SWAP_MAP_BAD 0x3f /* Note pageblock is bad, in first swap_map */ -#define SWAP_HAS_CACHE 0x40 /* Flag page is cached, in first swap_map */ -#define SWAP_CONT_MAX 0x7f /* Max count, in each swap_map continuation */ -#define COUNT_CONTINUED 0x80 /* See swap_map continuation for full count */ -#define SWAP_MAP_SHMEM 0xbf /* Owned by shmem/tmpfs, in first swap_map */ - -/* - * The in-memory structure used to track swap areas. - */ -struct swap_info_struct { - unsigned long flags; /* SWP_USED etc: see above */ - signed short prio; /* swap priority of this type */ - signed char type; /* strange name for an index */ - signed char next; /* next type on the swap list */ - unsigned int max; /* extent of the swap_map */ - unsigned char *swap_map; /* vmalloc'ed array of usage counts */ - unsigned int lowest_bit; /* index of first free in swap_map */ - unsigned int highest_bit; /* index of last free in swap_map */ - unsigned int pages; /* total of usable pages of swap */ - unsigned int inuse_pages; /* number of those currently in use */ - unsigned int cluster_next; /* likely index for next allocation */ - unsigned int cluster_nr; /* countdown to next cluster search */ - unsigned int lowest_alloc; /* while preparing discard cluster */ - unsigned int highest_alloc; /* while preparing discard cluster */ - struct swap_extent *curr_swap_extent; - struct swap_extent first_swap_extent; - struct block_device *bdev; /* swap device or bdev of swap file */ - struct file *swap_file; /* seldom referenced */ - unsigned int old_block_size; /* seldom referenced */ -}; - -struct swap_list_t { - int head; /* head of priority-ordered swapfile list */ - int next; /* swapfile to be used next */ -}; - -/* Swap 50% full? Release swapcache more aggressively.. */ -#define vm_swap_full() (nr_swap_pages*2 < total_swap_pages) - -/* linux/mm/page_alloc.c */ -extern unsigned long totalram_pages; -extern unsigned long totalreserve_pages; -extern unsigned long dirty_balance_reserve; -extern unsigned int nr_free_buffer_pages(void); -extern unsigned int nr_free_pagecache_pages(void); - -/* Definition of global_page_state not available yet */ -#define nr_free_pages() global_page_state(NR_FREE_PAGES) - - -/* linux/mm/swap.c */ -extern void __lru_cache_add(struct page *, enum lru_list lru); -extern void lru_cache_add_lru(struct page *, enum lru_list lru); -extern void lru_add_page_tail(struct zone* zone, - struct page *page, struct page *page_tail); -extern void activate_page(struct page *); -extern void mark_page_accessed(struct page *); -extern void lru_add_drain(void); -extern void lru_add_drain_cpu(int cpu); -extern int lru_add_drain_all(void); -extern void rotate_reclaimable_page(struct page *page); -extern void deactivate_page(struct page *page); -extern void swap_setup(void); - -extern void add_page_to_unevictable_list(struct page *page); - -/** - * lru_cache_add: add a page to the page lists - * @page: the page to add - */ -static inline void lru_cache_add_anon(struct page *page) -{ - __lru_cache_add(page, LRU_INACTIVE_ANON); -} - -static inline void lru_cache_add_file(struct page *page) -{ - __lru_cache_add(page, LRU_INACTIVE_FILE); -} - -/* linux/mm/vmscan.c */ -extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order, - gfp_t gfp_mask, nodemask_t *mask); -extern int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file); -extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem, - gfp_t gfp_mask, bool noswap); -extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem, - gfp_t gfp_mask, bool noswap, - struct zone *zone, - unsigned long *nr_scanned); -extern unsigned long shrink_all_memory(unsigned long nr_pages); -extern int vm_swappiness; -extern int remove_mapping(struct address_space *mapping, struct page *page); -extern long vm_total_pages; - -#ifdef CONFIG_NUMA -extern int zone_reclaim_mode; -extern int sysctl_min_unmapped_ratio; -extern int sysctl_min_slab_ratio; -extern int zone_reclaim(struct zone *, gfp_t, unsigned int); -#else -#define zone_reclaim_mode 0 -static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order) -{ - return 0; -} -#endif - -extern int page_evictable(struct page *page, struct vm_area_struct *vma); -extern void check_move_unevictable_pages(struct page **, int nr_pages); - -extern unsigned long scan_unevictable_pages; -extern int scan_unevictable_handler(struct ctl_table *, int, - void __user *, size_t *, loff_t *); -#ifdef CONFIG_NUMA -extern int scan_unevictable_register_node(struct node *node); -extern void scan_unevictable_unregister_node(struct node *node); -#else -static inline int scan_unevictable_register_node(struct node *node) -{ - return 0; -} -static inline void scan_unevictable_unregister_node(struct node *node) -{ -} -#endif - -extern int kswapd_run(int nid); -extern void kswapd_stop(int nid); -#ifdef CONFIG_CGROUP_MEM_RES_CTLR -extern int mem_cgroup_swappiness(struct mem_cgroup *mem); -#else -static inline int mem_cgroup_swappiness(struct mem_cgroup *mem) -{ - return vm_swappiness; -} -#endif -#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP -extern void mem_cgroup_uncharge_swap(swp_entry_t ent); -#else -static inline void mem_cgroup_uncharge_swap(swp_entry_t ent) -{ -} -#endif -#ifdef CONFIG_SWAP -/* linux/mm/page_io.c */ -extern int swap_readpage(struct page *); -extern int swap_writepage(struct page *page, struct writeback_control *wbc); -extern void end_swap_bio_read(struct bio *bio, int err); - -/* linux/mm/swap_state.c */ -extern struct address_space swapper_space; -#define total_swapcache_pages swapper_space.nrpages -extern void show_swap_cache_info(void); -extern int add_to_swap(struct page *); -extern int add_to_swap_cache(struct page *, swp_entry_t, gfp_t); -extern void __delete_from_swap_cache(struct page *); -extern void delete_from_swap_cache(struct page *); -extern void free_page_and_swap_cache(struct page *); -extern void free_pages_and_swap_cache(struct page **, int); -extern struct page *lookup_swap_cache(swp_entry_t); -extern struct page *read_swap_cache_async(swp_entry_t, gfp_t, - struct vm_area_struct *vma, unsigned long addr); -extern struct page *swapin_readahead(swp_entry_t, gfp_t, - struct vm_area_struct *vma, unsigned long addr); - -/* linux/mm/swapfile.c */ -extern long nr_swap_pages; -extern long total_swap_pages; -extern void si_swapinfo(struct sysinfo *); -extern swp_entry_t get_swap_page(void); -extern swp_entry_t get_swap_page_of_type(int); -extern int add_swap_count_continuation(swp_entry_t, gfp_t); -extern void swap_shmem_alloc(swp_entry_t); -extern int swap_duplicate(swp_entry_t); -extern int swapcache_prepare(swp_entry_t); -extern void swap_free(swp_entry_t); -extern void swapcache_free(swp_entry_t, struct page *page); -extern int free_swap_and_cache(swp_entry_t); -extern int swap_type_of(dev_t, sector_t, struct block_device **); -extern unsigned int count_swap_pages(int, int); -extern sector_t map_swap_page(struct page *, struct block_device **); -extern sector_t swapdev_block(int, pgoff_t); -extern int reuse_swap_page(struct page *); -extern int try_to_free_swap(struct page *); -struct backing_dev_info; - -/* linux/mm/thrash.c */ -extern struct mm_struct *swap_token_mm; -extern void grab_swap_token(struct mm_struct *); -extern void __put_swap_token(struct mm_struct *); -extern void disable_swap_token(struct mem_cgroup *memcg); - -static inline int has_swap_token(struct mm_struct *mm) -{ - return (mm == swap_token_mm); -} - -static inline void put_swap_token(struct mm_struct *mm) -{ - if (has_swap_token(mm)) - __put_swap_token(mm); -} - -#ifdef CONFIG_CGROUP_MEM_RES_CTLR -extern void -mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout); -extern int mem_cgroup_count_swap_user(swp_entry_t ent, struct page **pagep); -#else -static inline void -mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout) -{ -} -#endif - -#else /* CONFIG_SWAP */ - -#define nr_swap_pages 0L -#define total_swap_pages 0L -#define total_swapcache_pages 0UL - -#define si_swapinfo(val) \ - do { (val)->freeswap = (val)->totalswap = 0; } while (0) -/* only sparc can not include linux/pagemap.h in this file - * so leave page_cache_release and release_pages undeclared... */ -#define free_page_and_swap_cache(page) \ - page_cache_release(page) -#define free_pages_and_swap_cache(pages, nr) \ - release_pages((pages), (nr), 0); - -static inline void show_swap_cache_info(void) -{ -} - -#define free_swap_and_cache(swp) is_migration_entry(swp) -#define swapcache_prepare(swp) is_migration_entry(swp) - -static inline int add_swap_count_continuation(swp_entry_t swp, gfp_t gfp_mask) -{ - return 0; -} - -static inline void swap_shmem_alloc(swp_entry_t swp) -{ -} - -static inline int swap_duplicate(swp_entry_t swp) -{ - return 0; -} - -static inline void swap_free(swp_entry_t swp) -{ -} - -static inline void swapcache_free(swp_entry_t swp, struct page *page) -{ -} - -static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask, - struct vm_area_struct *vma, unsigned long addr) -{ - return NULL; -} - -static inline int swap_writepage(struct page *p, struct writeback_control *wbc) -{ - return 0; -} - -static inline struct page *lookup_swap_cache(swp_entry_t swp) -{ - return NULL; -} - -static inline int add_to_swap(struct page *page) -{ - return 0; -} - -static inline int add_to_swap_cache(struct page *page, swp_entry_t entry, - gfp_t gfp_mask) -{ - return -1; -} - -static inline void __delete_from_swap_cache(struct page *page) -{ -} - -static inline void delete_from_swap_cache(struct page *page) -{ -} - -#define reuse_swap_page(page) (page_mapcount(page) == 1) - -static inline int try_to_free_swap(struct page *page) -{ - return 0; -} - -static inline swp_entry_t get_swap_page(void) -{ - swp_entry_t entry; - entry.val = 0; - return entry; -} - -/* linux/mm/thrash.c */ -static inline void put_swap_token(struct mm_struct *mm) -{ -} - -static inline void grab_swap_token(struct mm_struct *mm) -{ -} - -static inline int has_swap_token(struct mm_struct *mm) -{ - return 0; -} - -static inline void disable_swap_token(struct mem_cgroup *memcg) -{ -} - -static inline void -mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent) -{ -} - -#ifdef CONFIG_CGROUP_MEM_RES_CTLR -static inline int -mem_cgroup_count_swap_user(swp_entry_t ent, struct page **pagep) -{ - return 0; -} -#endif - -#endif /* CONFIG_SWAP */ -#endif /* __KERNEL__*/ -#endif /* _LINUX_SWAP_H */ |