Release 4.12 include/linux/swap_slots.h

#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);

extern bool swap_slot_cache_enabled;

#endif /* _LINUX_SWAP_SLOTS_H */
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