/* 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 */