| /* 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); |
| void enable_swap_slots_cache(void); |
| int free_swap_slot(swp_entry_t entry); |
| |
| extern bool swap_slot_cache_enabled; |
| |
| #endif /* _LINUX_SWAP_SLOTS_H */ |