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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); | |
f3bc52cb | 26 | void enable_swap_slots_cache(void); |
67afa38e TC |
27 | int free_swap_slot(swp_entry_t entry); |
28 | ||
ba81f838 HY |
29 | extern bool swap_slot_cache_enabled; |
30 | ||
67afa38e | 31 | #endif /* _LINUX_SWAP_SLOTS_H */ |