2fd1f19d55
struct swap_slots_cache :: ANDROID_VENDOR_DATA(1) 1) Multiple swap devices can be supported; 2) There are different kinds of data; 3) During data reclamation, different types of data are exchanged to different swap devices; 4) Each swap device has corresponding arrays of slots and slots_ret; 5) Each swap device has corresponding indexes of nr, cur and n_ret; 6) This field is a pointer, it points to a struct which contains all the other arrays and indexes; Bug: 225795494 Change-Id: Icf116135926be98449a2d96fc458e58e5ad3b7e9 Signed-off-by: Bing Han <bing.han@transsion.com> (cherry picked from commit a034320a6855af99fe1ec1dfe6cafa4c2a15ecce)
33 lines
866 B
C
33 lines
866 B
C
/* 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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ANDROID_VENDOR_DATA(1);
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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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