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Linux/include/linux/swap_slots.h

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  1 #ifndef _LINUX_SWAP_SLOTS_H
  2 #define _LINUX_SWAP_SLOTS_H
  3 
  4 #include <linux/swap.h>
  5 #include <linux/spinlock.h>
  6 #include <linux/mutex.h>
  7 
  8 #define SWAP_SLOTS_CACHE_SIZE                   SWAP_BATCH
  9 #define THRESHOLD_ACTIVATE_SWAP_SLOTS_CACHE     (5*SWAP_SLOTS_CACHE_SIZE)
 10 #define THRESHOLD_DEACTIVATE_SWAP_SLOTS_CACHE   (2*SWAP_SLOTS_CACHE_SIZE)
 11 
 12 struct swap_slots_cache {
 13         bool            lock_initialized;
 14         struct mutex    alloc_lock; /* protects slots, nr, cur */
 15         swp_entry_t     *slots;
 16         int             nr;
 17         int             cur;
 18         spinlock_t      free_lock;  /* protects slots_ret, n_ret */
 19         swp_entry_t     *slots_ret;
 20         int             n_ret;
 21 };
 22 
 23 void disable_swap_slots_cache_lock(void);
 24 void reenable_swap_slots_cache_unlock(void);
 25 int enable_swap_slots_cache(void);
 26 int free_swap_slot(swp_entry_t entry);
 27 
 28 extern bool swap_slot_cache_enabled;
 29 
 30 #endif /* _LINUX_SWAP_SLOTS_H */
 31 

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