/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SWAP_SLOTS_H
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#define _LINUX_SWAP_SLOTS_H
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#include <linux/swap.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#define SWAP_SLOTS_CACHE_SIZE SWAP_BATCH
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#define THRESHOLD_ACTIVATE_SWAP_SLOTS_CACHE (5*SWAP_SLOTS_CACHE_SIZE)
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#define THRESHOLD_DEACTIVATE_SWAP_SLOTS_CACHE (2*SWAP_SLOTS_CACHE_SIZE)
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struct swap_slots_cache {
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bool lock_initialized;
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struct mutex alloc_lock; /* protects slots, nr, cur */
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swp_entry_t *slots;
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int nr;
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int cur;
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spinlock_t free_lock; /* protects slots_ret, n_ret */
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swp_entry_t *slots_ret;
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int n_ret;
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};
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void disable_swap_slots_cache_lock(void);
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void reenable_swap_slots_cache_unlock(void);
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void enable_swap_slots_cache(void);
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int free_swap_slot(swp_entry_t entry);
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extern bool swap_slot_cache_enabled;
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#endif /* _LINUX_SWAP_SLOTS_H */
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