diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/swap.h | 4 | ||||
| -rw-r--r-- | include/linux/swap_slots.h | 28 |
2 files changed, 32 insertions, 0 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h index bcc0b18f96d2..45e91dd6716d 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -372,6 +372,7 @@ extern struct page *swapin_readahead(swp_entry_t, gfp_t, /* linux/mm/swapfile.c */ extern atomic_long_t nr_swap_pages; extern long total_swap_pages; +extern bool has_usable_swap(void); /* Swap 50% full? Release swapcache more aggressively.. */ static inline bool vm_swap_full(void) @@ -410,6 +411,9 @@ struct backing_dev_info; extern int init_swap_address_space(unsigned int type, unsigned long nr_pages); extern void exit_swap_address_space(unsigned int type); +extern int get_swap_slots(int n, swp_entry_t *slots); +extern void swapcache_free_batch(swp_entry_t *entries, int n); + #else /* CONFIG_SWAP */ #define swap_address_space(entry) (NULL) diff --git a/include/linux/swap_slots.h b/include/linux/swap_slots.h new file mode 100644 index 000000000000..ba5623b27c60 --- /dev/null +++ b/include/linux/swap_slots.h @@ -0,0 +1,28 @@ +#ifndef _LINUX_SWAP_SLOTS_H +#define _LINUX_SWAP_SLOTS_H + +#include <linux/swap.h> +#include <linux/spinlock.h> +#include <linux/mutex.h> + +#define SWAP_SLOTS_CACHE_SIZE SWAP_BATCH +#define THRESHOLD_ACTIVATE_SWAP_SLOTS_CACHE (5*SWAP_SLOTS_CACHE_SIZE) +#define THRESHOLD_DEACTIVATE_SWAP_SLOTS_CACHE (2*SWAP_SLOTS_CACHE_SIZE) + +struct swap_slots_cache { + bool lock_initialized; + struct mutex alloc_lock; /* protects slots, nr, cur */ + swp_entry_t *slots; + int nr; + int cur; + spinlock_t free_lock; /* protects slots_ret, n_ret */ + swp_entry_t *slots_ret; + int n_ret; +}; + +void disable_swap_slots_cache_lock(void); +void reenable_swap_slots_cache_unlock(void); +int enable_swap_slots_cache(void); +int free_swap_slot(swp_entry_t entry); + +#endif /* _LINUX_SWAP_SLOTS_H */ |