[mirror_ubuntu-bionic-kernel.git] / include / linux / swap_slots.h

/* SPDX-License-Identifier: GPL-2.0 */
#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 */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
67afa38e TC	2	#ifndef _LINUX_SWAP_SLOTS_H
	3	#define _LINUX_SWAP_SLOTS_H
	4
	5	#include <linux/swap.h>
	6	#include <linux/spinlock.h>
	7	#include <linux/mutex.h>
	8
	9	#define SWAP_SLOTS_CACHE_SIZE SWAP_BATCH
	10	#define THRESHOLD_ACTIVATE_SWAP_SLOTS_CACHE (5*SWAP_SLOTS_CACHE_SIZE)
	11	#define THRESHOLD_DEACTIVATE_SWAP_SLOTS_CACHE (2*SWAP_SLOTS_CACHE_SIZE)
	12
	13	struct swap_slots_cache {
	14	bool lock_initialized;
	15	struct mutex alloc_lock; /* protects slots, nr, cur */
	16	swp_entry_t *slots;
	17	int nr;
	18	int cur;
	19	spinlock_t free_lock; /* protects slots_ret, n_ret */
	20	swp_entry_t *slots_ret;
	21	int n_ret;
	22	};
	23
	24	void disable_swap_slots_cache_lock(void);
	25	void reenable_swap_slots_cache_unlock(void);
	26	int enable_swap_slots_cache(void);
	27	int free_swap_slot(swp_entry_t entry);
	28
ba81f838 HY	29	extern bool swap_slot_cache_enabled;
ba81f838 HY	30
67afa38e	31	#endif /* _LINUX_SWAP_SLOTS_H */