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67afa38e TC |
1 | #ifndef _LINUX_SWAP_SLOTS_H |
2 | #define _LINUX_SWAP_SLOTS_H | |
3 | ||
4 | #include <linux/swap.h> | |
5 | #include <linux/spinlock.h> | |
6 | #include <linux/mutex.h> | |
7 | ||
8 | #define SWAP_SLOTS_CACHE_SIZE SWAP_BATCH | |
9 | #define THRESHOLD_ACTIVATE_SWAP_SLOTS_CACHE (5*SWAP_SLOTS_CACHE_SIZE) | |
10 | #define THRESHOLD_DEACTIVATE_SWAP_SLOTS_CACHE (2*SWAP_SLOTS_CACHE_SIZE) | |
11 | ||
12 | struct swap_slots_cache { | |
13 | bool lock_initialized; | |
14 | struct mutex alloc_lock; /* protects slots, nr, cur */ | |
15 | swp_entry_t *slots; | |
16 | int nr; | |
17 | int cur; | |
18 | spinlock_t free_lock; /* protects slots_ret, n_ret */ | |
19 | swp_entry_t *slots_ret; | |
20 | int n_ret; | |
21 | }; | |
22 | ||
23 | void disable_swap_slots_cache_lock(void); | |
24 | void reenable_swap_slots_cache_unlock(void); | |
25 | int enable_swap_slots_cache(void); | |
26 | int free_swap_slot(swp_entry_t entry); | |
27 | ||
ba81f838 HY |
28 | extern bool swap_slot_cache_enabled; |
29 | ||
67afa38e | 30 | #endif /* _LINUX_SWAP_SLOTS_H */ |