1 /* SPDX-License-Identifier: GPL-2.0 */ 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 int n_ret; 20 }; 21 22 void disable_swap_slots_cache_lock(void); 23 void reenable_swap_slots_cache_unlock(void); 24 void enable_swap_slots_cache(void); 25 26 extern bool swap_slot_cache_enabled; 27 28 #endif /* _LINUX_SWAP_SLOTS_H */ 29