1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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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 | void enable_swap_slots_cache(void); |
27 | void free_swap_slot(swp_entry_t entry); |
28 | |
29 | extern bool swap_slot_cache_enabled; |
30 | |
31 | #endif /* _LINUX_SWAP_SLOTS_H */ |
32 |