#include <linux/sched.h>
#include <linux/node.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
#include <asm/page.h>
struct notifier_block;
#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 */
static inline int current_is_kswapd(void)
{
* the type/offset into the pte as 5/27 as well.
*/
#define MAX_SWAPFILES_SHIFT 5
-#ifndef CONFIG_MIGRATION
-#define MAX_SWAPFILES (1 << MAX_SWAPFILES_SHIFT)
+
+/*
+ * 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
-/* Use last two entries for page migration swap entries */
-#define MAX_SWAPFILES ((1 << MAX_SWAPFILES_SHIFT)-2)
-#define SWP_MIGRATION_READ MAX_SWAPFILES
-#define SWP_MIGRATION_WRITE (MAX_SWAPFILES + 1)
+#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)
enum {
SWP_USED = (1 << 0), /* is slot in swap_info[] used? */
SWP_WRITEOK = (1 << 1), /* ok to write to this swap? */
- SWP_ACTIVE = (SWP_USED | SWP_WRITEOK),
+ 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
-#define SWAP_MAP_MAX 0x7fff
-#define SWAP_MAP_BAD 0x8000
+/*
+ * 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 int flags;
- int prio; /* swap priority */
- struct file *swap_file;
- struct block_device *bdev;
- struct list_head extent_list;
+ 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;
- unsigned old_block_size;
- unsigned short * swap_map;
- unsigned int lowest_bit;
- unsigned int highest_bit;
- unsigned int cluster_next;
- unsigned int cluster_nr;
- unsigned int pages;
- unsigned int max;
- unsigned int inuse_pages;
- int next; /* next entry on swap list */
+ 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 {
/* linux/mm/page_alloc.c */
extern unsigned long totalram_pages;
extern unsigned long totalreserve_pages;
-extern long nr_swap_pages;
extern unsigned int nr_free_buffer_pages(void);
extern unsigned int nr_free_pagecache_pages(void);
/* 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 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(page, LRU_INACTIVE_ANON);
}
-static inline void lru_cache_add_active_anon(struct page *page)
-{
- __lru_cache_add(page, LRU_ACTIVE_ANON);
-}
-
static inline void lru_cache_add_file(struct page *page)
{
__lru_cache_add(page, LRU_INACTIVE_FILE);
}
-static inline void lru_cache_add_active_file(struct page *page)
-{
- __lru_cache_add(page, LRU_ACTIVE_FILE);
-}
+/* LRU Isolation modes. */
+#define ISOLATE_INACTIVE 0 /* Isolate inactive pages. */
+#define ISOLATE_ACTIVE 1 /* Isolate active pages. */
+#define ISOLATE_BOTH 2 /* Isolate both active and inactive pages. */
/* linux/mm/vmscan.c */
extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
- gfp_t gfp_mask);
-extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
- gfp_t gfp_mask);
+ gfp_t gfp_mask, nodemask_t *mask);
extern int __isolate_lru_page(struct page *page, int 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);
}
#endif
-#ifdef CONFIG_UNEVICTABLE_LRU
extern int page_evictable(struct page *page, struct vm_area_struct *vma);
extern void scan_mapping_unevictable_pages(struct address_space *);
extern unsigned long scan_unevictable_pages;
-extern int scan_unevictable_handler(struct ctl_table *, int, struct file *,
+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 page_evictable(struct page *page,
- struct vm_area_struct *vma)
+static inline int scan_unevictable_register_node(struct node *node)
{
- return 1;
+ return 0;
}
-
-static inline void scan_mapping_unevictable_pages(struct address_space *mapping)
+static inline void scan_unevictable_unregister_node(struct node *node)
{
}
+#endif
-static inline int scan_unevictable_register_node(struct node *node)
+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 0;
+ return vm_swappiness;
}
-
-static inline void scan_unevictable_unregister_node(struct node *node) { }
#endif
-
-extern int kswapd_run(int nid);
-
-#ifdef CONFIG_MMU
-/* linux/mm/shmem.c */
-extern int shmem_unuse(swp_entry_t entry, struct page *page);
-#endif /* CONFIG_MMU */
-
-extern void swap_unplug_io_fn(struct backing_dev_info *, struct page *);
-
#ifdef CONFIG_SWAP
/* linux/mm/page_io.c */
-extern int swap_readpage(struct file *, struct page *);
+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);
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 swap_duplicate(swp_entry_t);
extern int valid_swaphandles(swp_entry_t, unsigned long *);
+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 free_swap_and_cache(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 swap_info_struct *, pgoff_t);
+extern sector_t map_swap_page(struct page *, struct block_device **);
extern sector_t swapdev_block(int, pgoff_t);
-extern struct swap_info_struct *get_swap_info_struct(unsigned);
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(void);
+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)
{
__put_swap_token(mm);
}
-static inline void disable_swap_token(void)
+#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
+#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)
{
- put_swap_token(swap_token_mm);
}
+#endif
#else /* CONFIG_SWAP */
-#define total_swap_pages 0
+#define nr_swap_pages 0L
+#define total_swap_pages 0L
#define total_swapcache_pages 0UL
#define si_swapinfo(val) \
{
}
-static inline void free_swap_and_cache(swp_entry_t swp)
+#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 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;
}
/* linux/mm/thrash.c */
-#define put_swap_token(x) do { } while(0)
-#define grab_swap_token() do { } while(0)
-#define has_swap_token(x) 0
-#define disable_swap_token() do { } while(0)
+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__*/
Code Review / linux-2.6.git / blobdiff