/*
* Copyright (c) 2000-2016 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
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*/
#ifndef _VM_VM_COMPRESSOR_H_
#define _VM_VM_COMPRESSOR_H_
#include <vm/vm_compressor_pager.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#include <vm/vm_protos.h>
#include <vm/WKdm_new.h>
#include <vm/vm_object.h>
#include <vm/vm_map.h>
#include <machine/pmap.h>
#include <kern/locks.h>
#include <sys/kdebug.h>
#if defined(__arm64__)
#include <arm64/proc_reg.h>
#endif
#define C_SEG_OFFSET_BITS 16
#define C_SEG_MAX_POPULATE_SIZE (4 * PAGE_SIZE)
#if defined(__arm64__) && (DEVELOPMENT || DEBUG)
#if defined(XNU_PLATFORM_WatchOS)
#define VALIDATE_C_SEGMENTS (1)
#endif
#endif /* defined(__arm64__) && (DEVELOPMENT || DEBUG) */
#if DEBUG || COMPRESSOR_INTEGRITY_CHECKS
#define ENABLE_SWAP_CHECKS 1
#define ENABLE_COMPRESSOR_CHECKS 1
#define POPCOUNT_THE_COMPRESSED_DATA (1)
#else
#define ENABLE_SWAP_CHECKS 0
#define ENABLE_COMPRESSOR_CHECKS 0
#endif
#define CHECKSUM_THE_SWAP ENABLE_SWAP_CHECKS /* Debug swap data */
#define CHECKSUM_THE_DATA ENABLE_COMPRESSOR_CHECKS /* Debug compressor/decompressor data */
#define CHECKSUM_THE_COMPRESSED_DATA ENABLE_COMPRESSOR_CHECKS /* Debug compressor/decompressor compressed data */
#ifndef VALIDATE_C_SEGMENTS
#define VALIDATE_C_SEGMENTS ENABLE_COMPRESSOR_CHECKS /* Debug compaction */
#endif
#define RECORD_THE_COMPRESSED_DATA 0
/*
* The c_slot structure embeds a packed pointer to a c_slot_mapping
* (32bits) which we ideally want to span as much VA space as possible
* to not limit zalloc in how it sets itself up.
*/
#if !defined(__LP64__) /* no packing */
#define C_SLOT_PACKED_PTR_BITS 32
#define C_SLOT_PACKED_PTR_SHIFT 0
#define C_SLOT_PACKED_PTR_BASE 0
#define C_SLOT_C_SIZE_BITS 12
#define C_SLOT_C_CODEC_BITS 1
#define C_SLOT_C_POPCOUNT_BITS 0
#define C_SLOT_C_PADDING_BITS 3
#elif defined(__arm64__) /* 32G from the heap start */
#define C_SLOT_PACKED_PTR_BITS 33
#define C_SLOT_PACKED_PTR_SHIFT 2
#define C_SLOT_PACKED_PTR_BASE ((uintptr_t)KERNEL_PMAP_HEAP_RANGE_START)
#define C_SLOT_C_SIZE_BITS 14
#define C_SLOT_C_CODEC_BITS 1
#define C_SLOT_C_POPCOUNT_BITS 0
#define C_SLOT_C_PADDING_BITS 0
#elif defined(__x86_64__) /* 256G from the heap start */
#define C_SLOT_PACKED_PTR_BITS 36
#define C_SLOT_PACKED_PTR_SHIFT 2
#define C_SLOT_PACKED_PTR_BASE ((uintptr_t)KERNEL_PMAP_HEAP_RANGE_START)
#define C_SLOT_C_SIZE_BITS 12
#define C_SLOT_C_CODEC_BITS 0 /* not used */
#define C_SLOT_C_POPCOUNT_BITS 0
#define C_SLOT_C_PADDING_BITS 0
#else
#error vm_compressor parameters undefined for this architecture
#endif
/*
* Popcounts needs to represent both 0 and full which requires
* (8 ^ C_SLOT_C_SIZE_BITS) + 1 values and (C_SLOT_C_SIZE_BITS + 4) bits.
*
* We us the (2 * (8 ^ C_SLOT_C_SIZE_BITS) - 1) value to mean "unknown".
*/
#define C_SLOT_NO_POPCOUNT ((16u << C_SLOT_C_SIZE_BITS) - 1)
static_assert((C_SEG_OFFSET_BITS + C_SLOT_C_SIZE_BITS +
C_SLOT_C_CODEC_BITS + C_SLOT_C_POPCOUNT_BITS +
C_SLOT_C_PADDING_BITS + C_SLOT_PACKED_PTR_BITS) % 32 == 0);
struct c_slot {
uint64_t c_offset:C_SEG_OFFSET_BITS __kernel_ptr_semantics;
uint64_t c_size:C_SLOT_C_SIZE_BITS;
#if C_SLOT_C_CODEC_BITS
uint64_t c_codec:C_SLOT_C_CODEC_BITS;
#endif
#if C_SLOT_C_POPCOUNT_BITS
/*
* This value may not agree with c_pop_cdata, as it may be the
* population count of the uncompressed data.
*
* This value must be C_SLOT_NO_POPCOUNT when the compression algorithm
* cannot provide it.
*/
uint32_t c_inline_popcount:C_SLOT_C_POPCOUNT_BITS;
#endif
#if C_SLOT_C_PADDING_BITS
uint64_t c_padding:C_SLOT_C_PADDING_BITS;
#endif
uint64_t c_packed_ptr:C_SLOT_PACKED_PTR_BITS __kernel_ptr_semantics;
/* debugging fields, typically not present on release kernels */
#if CHECKSUM_THE_DATA
unsigned int c_hash_data;
#endif
#if CHECKSUM_THE_COMPRESSED_DATA
unsigned int c_hash_compressed_data;
#endif
#if POPCOUNT_THE_COMPRESSED_DATA
unsigned int c_pop_cdata;
#endif
} __attribute__((packed, aligned(4)));
#define C_IS_EMPTY 0
#define C_IS_FREE 1
#define C_IS_FILLING 2
#define C_ON_AGE_Q 3
#define C_ON_SWAPOUT_Q 4
#define C_ON_SWAPPEDOUT_Q 5
#define C_ON_SWAPPEDOUTSPARSE_Q 6
#define C_ON_SWAPPEDIN_Q 7
#define C_ON_MAJORCOMPACT_Q 8
#define C_ON_BAD_Q 9
#define C_ON_SWAPIO_Q 10
struct c_segment {
lck_mtx_t c_lock;
queue_chain_t c_age_list;
queue_chain_t c_list;
#if CONFIG_FREEZE
queue_chain_t c_task_list_next_cseg;
task_t c_task_owner;
#endif /* CONFIG_FREEZE */
#define C_SEG_MAX_LIMIT (UINT_MAX) /* this needs to track the size of c_mysegno */
uint32_t c_mysegno;
uint32_t c_creation_ts;
uint64_t c_generation_id;
int32_t c_bytes_used;
int32_t c_bytes_unused;
uint32_t c_slots_used;
uint16_t c_firstemptyslot;
uint16_t c_nextslot;
uint32_t c_nextoffset;
uint32_t c_populated_offset;
union {
int32_t *c_buffer;
uint64_t c_swap_handle;
} c_store;
#if VALIDATE_C_SEGMENTS
uint32_t c_was_minor_compacted;
uint32_t c_was_major_compacted;
uint32_t c_was_major_donor;
#endif
#if CHECKSUM_THE_SWAP
unsigned int cseg_hash;
unsigned int cseg_swap_size;
#endif /* CHECKSUM_THE_SWAP */
thread_t c_busy_for_thread;
uint32_t c_agedin_ts;
uint32_t c_swappedin_ts;
bool c_swappedin;
/*
* Do not pull c_swappedin above into the bitfield below.
* We update it without always taking the segment
* lock and rely on the segment being busy instead.
* The bitfield needs the segment lock. So updating
* this state, if in the bitfield, without the lock
* will race with the updates to the other fields and
* result in a mess.
*/
uint32_t c_busy:1,
c_busy_swapping:1,
c_wanted:1,
c_on_minorcompact_q:1, /* can also be on the age_q, the majorcompact_q or the swappedin_q */
c_state:4, /* what state is the segment in which dictates which q to find it on */
c_overage_swap:1,
c_has_donated_pages:1,
#if CONFIG_FREEZE
c_has_freezer_pages:1,
c_reserved:21;
#else /* CONFIG_FREEZE */
c_reserved:22;
#endif /* CONFIG_FREEZE */
int c_slot_var_array_len;
struct c_slot *c_slot_var_array;
struct c_slot c_slot_fixed_array[0];
};
struct c_slot_mapping {
#if !CONFIG_TRACK_UNMODIFIED_ANON_PAGES
uint32_t s_cseg:22, /* segment number + 1 */
s_cindx:10; /* index in the segment */
#else /* !CONFIG_TRACK_UNMODIFIED_ANON_PAGES */
uint32_t s_cseg:21, /* segment number + 1 */
s_cindx:10, /* index in the segment */
s_uncompressed:1; /* This bit indicates that the page resides uncompressed in a swapfile.
* This can happen in 2 ways:-
* 1) Page used to be in the compressor, got decompressed, was not
* modified, and so was pushed uncompressed to a different swapfile on disk.
* 2) Page was in its uncompressed form in a swapfile on disk. It got swapped in
* but was not modified. As we are about to reclaim it, we notice that this bit
* is set in its current slot. And so we can safely toss this clean anonymous page
* because its copy exists on disk.
*/
#endif /* !CONFIG_TRACK_UNMODIFIED_ANON_PAGES */
};
#define C_SLOT_MAX_INDEX (1 << 10)
typedef struct c_slot_mapping *c_slot_mapping_t;
extern int c_seg_fixed_array_len;
extern vm_offset_t c_buffers;
extern int64_t c_segment_compressed_bytes;
#define C_SEG_BUFFER_ADDRESS(c_segno) ((c_buffers + ((uint64_t)c_segno * (uint64_t)c_seg_allocsize)))
#define C_SEG_SLOT_FROM_INDEX(cseg, index) (index < c_seg_fixed_array_len ? &(cseg->c_slot_fixed_array[index]) : &(cseg->c_slot_var_array[index - c_seg_fixed_array_len]))
#define C_SEG_OFFSET_TO_BYTES(off) ((off) * (int) sizeof(int32_t))
#define C_SEG_BYTES_TO_OFFSET(bytes) ((bytes) / (int) sizeof(int32_t))
#define C_SEG_UNUSED_BYTES(cseg) (cseg->c_bytes_unused + (C_SEG_OFFSET_TO_BYTES(cseg->c_populated_offset - cseg->c_nextoffset)))
#ifndef __PLATFORM_WKDM_ALIGNMENT_MASK__
#define C_SEG_OFFSET_ALIGNMENT_MASK 0x3ULL
#define C_SEG_OFFSET_ALIGNMENT_BOUNDARY 0x4
#else
#define C_SEG_OFFSET_ALIGNMENT_MASK __PLATFORM_WKDM_ALIGNMENT_MASK__
#define C_SEG_OFFSET_ALIGNMENT_BOUNDARY __PLATFORM_WKDM_ALIGNMENT_BOUNDARY__
#endif
#define C_SEG_SHOULD_MINORCOMPACT_NOW(cseg) ((C_SEG_UNUSED_BYTES(cseg) >= (c_seg_bufsize / 4)) ? 1 : 0)
/*
* the decsion to force a c_seg to be major compacted is based on 2 criteria
* 1) is the c_seg buffer almost empty (i.e. we have a chance to merge it with another c_seg)
* 2) are there at least a minimum number of slots unoccupied so that we have a chance
* of combining this c_seg with another one.
*/
#define C_SEG_SHOULD_MAJORCOMPACT_NOW(cseg) \
((((cseg->c_bytes_unused + (c_seg_bufsize - C_SEG_OFFSET_TO_BYTES(c_seg->c_nextoffset))) >= (c_seg_bufsize / 8)) && \
((C_SLOT_MAX_INDEX - cseg->c_slots_used) > (c_seg_bufsize / PAGE_SIZE))) \
? 1 : 0)
#define C_SEG_ONDISK_IS_SPARSE(cseg) ((cseg->c_bytes_used < cseg->c_bytes_unused) ? 1 : 0)
#define C_SEG_IS_ONDISK(cseg) ((cseg->c_state == C_ON_SWAPPEDOUT_Q || cseg->c_state == C_ON_SWAPPEDOUTSPARSE_Q))
#define C_SEG_IS_ON_DISK_OR_SOQ(cseg) ((cseg->c_state == C_ON_SWAPPEDOUT_Q || \
cseg->c_state == C_ON_SWAPPEDOUTSPARSE_Q || \
cseg->c_state == C_ON_SWAPOUT_Q || \
cseg->c_state == C_ON_SWAPIO_Q))
#define C_SEG_WAKEUP_DONE(cseg) \
MACRO_BEGIN \
assert((cseg)->c_busy); \
(cseg)->c_busy = 0; \
assert((cseg)->c_busy_for_thread != NULL); \
(cseg)->c_busy_for_thread = NULL; \
if ((cseg)->c_wanted) { \
(cseg)->c_wanted = 0; \
thread_wakeup((event_t) (cseg)); \
} \
MACRO_END
#define C_SEG_BUSY(cseg) \
MACRO_BEGIN \
assert((cseg)->c_busy == 0); \
(cseg)->c_busy = 1; \
assert((cseg)->c_busy_for_thread == NULL); \
(cseg)->c_busy_for_thread = current_thread(); \
MACRO_END
extern vm_map_t compressor_map;
#if DEVELOPMENT || DEBUG
extern boolean_t write_protect_c_segs;
extern int vm_compressor_test_seg_wp;
#define C_SEG_MAKE_WRITEABLE(cseg) \
MACRO_BEGIN \
if (write_protect_c_segs) { \
vm_map_protect(compressor_map, \
(vm_map_offset_t)cseg->c_store.c_buffer, \
(vm_map_offset_t)&cseg->c_store.c_buffer[C_SEG_BYTES_TO_OFFSET(c_seg_allocsize)],\
VM_PROT_READ | VM_PROT_WRITE, \
0); \
} \
MACRO_END
#define C_SEG_WRITE_PROTECT(cseg) \
MACRO_BEGIN \
if (write_protect_c_segs) { \
vm_map_protect(compressor_map, \
(vm_map_offset_t)cseg->c_store.c_buffer, \
(vm_map_offset_t)&cseg->c_store.c_buffer[C_SEG_BYTES_TO_OFFSET(c_seg_allocsize)],\
VM_PROT_READ, \
0); \
} \
if (vm_compressor_test_seg_wp) { \
volatile uint32_t vmtstmp = *(volatile uint32_t *)cseg->c_store.c_buffer; \
*(volatile uint32_t *)cseg->c_store.c_buffer = 0xDEADABCD; \
(void) vmtstmp; \
} \
MACRO_END
#endif
typedef struct c_segment *c_segment_t;
typedef struct c_slot *c_slot_t;
uint64_t vm_compressor_total_compressions(void);
void vm_wake_compactor_swapper(void);
void vm_run_compactor(void);
void vm_thrashing_jetsam_done(void);
void vm_consider_waking_compactor_swapper(void);
void vm_consider_swapping(void);
void vm_compressor_flush(void);
void c_seg_free(c_segment_t);
bool vm_compressor_is_thrashing(void);
bool vm_compressor_needs_to_swap(bool wake_memorystatus_thread);
void c_seg_free_locked(c_segment_t);
void c_seg_insert_into_age_q(c_segment_t);
void c_seg_need_delayed_compaction(c_segment_t, boolean_t);
void c_seg_update_task_owner(c_segment_t, task_t);
void vm_decompressor_lock(void);
void vm_decompressor_unlock(void);
void vm_compressor_delay_trim(void);
void vm_compressor_do_warmup(void);
void vm_compressor_record_warmup_start(void);
void vm_compressor_record_warmup_end(void);
int vm_wants_task_throttled(task_t);
extern void vm_compaction_swapper_do_init(void);
extern void vm_compressor_swap_init(void);
extern lck_rw_t c_master_lock;
#if ENCRYPTED_SWAP
extern void vm_swap_decrypt(c_segment_t);
#endif /* ENCRYPTED_SWAP */
extern int vm_swap_low_on_space(void);
extern int vm_swap_out_of_space(void);
extern kern_return_t vm_swap_get(c_segment_t, uint64_t, uint64_t);
extern void vm_swap_free(uint64_t);
extern void vm_swap_consider_defragmenting(int);
extern void c_seg_swapin_requeue(c_segment_t, boolean_t, boolean_t, boolean_t);
extern int c_seg_swapin(c_segment_t, boolean_t, boolean_t);
extern void c_seg_wait_on_busy(c_segment_t);
extern void c_seg_trim_tail(c_segment_t);
extern void c_seg_switch_state(c_segment_t, int, boolean_t);
extern boolean_t fastwake_recording_in_progress;
extern int compaction_swapper_inited;
extern int compaction_swapper_running;
extern uint64_t vm_swap_put_failures;
extern int c_overage_swapped_count;
extern int c_overage_swapped_limit;
extern queue_head_t c_minor_list_head;
extern queue_head_t c_age_list_head;
extern queue_head_t c_major_list_head;
extern queue_head_t c_early_swapout_list_head;
extern queue_head_t c_regular_swapout_list_head;
extern queue_head_t c_late_swapout_list_head;
extern queue_head_t c_swappedout_list_head;
extern queue_head_t c_swappedout_sparse_list_head;
extern uint32_t c_age_count;
extern uint32_t c_early_swapout_count, c_regular_swapout_count, c_late_swapout_count;
extern uint32_t c_swappedout_count;
extern uint32_t c_swappedout_sparse_count;
extern int64_t compressor_bytes_used;
extern uint64_t first_c_segment_to_warm_generation_id;
extern uint64_t last_c_segment_to_warm_generation_id;
extern boolean_t hibernate_flushing;
extern boolean_t hibernate_no_swapspace;
extern boolean_t hibernate_in_progress_with_pinned_swap;
extern boolean_t hibernate_flush_timed_out;
extern uint32_t swapout_target_age;
extern void c_seg_insert_into_q(queue_head_t *, c_segment_t);
extern uint32_t vm_compressor_minorcompact_threshold_divisor;
extern uint32_t vm_compressor_majorcompact_threshold_divisor;
extern uint32_t vm_compressor_unthrottle_threshold_divisor;
extern uint32_t vm_compressor_catchup_threshold_divisor;
extern uint32_t vm_compressor_minorcompact_threshold_divisor_overridden;
extern uint32_t vm_compressor_majorcompact_threshold_divisor_overridden;
extern uint32_t vm_compressor_unthrottle_threshold_divisor_overridden;
extern uint32_t vm_compressor_catchup_threshold_divisor_overridden;
extern uint64_t vm_compressor_compute_elapsed_msecs(clock_sec_t, clock_nsec_t, clock_sec_t, clock_nsec_t);
extern void kdp_compressor_busy_find_owner(event64_t wait_event, thread_waitinfo_t *waitinfo);
#define PAGE_REPLACEMENT_DISALLOWED(enable) (enable == TRUE ? lck_rw_lock_shared(&c_master_lock) : lck_rw_done(&c_master_lock))
#define PAGE_REPLACEMENT_ALLOWED(enable) (enable == TRUE ? lck_rw_lock_exclusive(&c_master_lock) : lck_rw_done(&c_master_lock))
#define AVAILABLE_NON_COMPRESSED_MEMORY (vm_page_active_count + vm_page_inactive_count + vm_page_free_count + vm_page_speculative_count)
#define AVAILABLE_MEMORY (AVAILABLE_NON_COMPRESSED_MEMORY + VM_PAGE_COMPRESSOR_COUNT)
/*
* TODO, there may be a minor optimisation opportunity to replace these divisions
* with multiplies and shifts
*
* By multiplying by 10, the divisors can have more precision w/o resorting to floating point... a divisor specified as 25 is in reality a divide by 2.5
* By multiplying by 9, you get a number ~11% smaller which allows us to have another limit point derived from the same base
* By multiplying by 11, you get a number ~10% bigger which allows us to generate a reset limit derived from the same base which is useful for hysteresis
*/
#define VM_PAGE_COMPRESSOR_COMPACT_THRESHOLD (((AVAILABLE_MEMORY) * 10) / (vm_compressor_minorcompact_threshold_divisor ? vm_compressor_minorcompact_threshold_divisor : 10))
#define VM_PAGE_COMPRESSOR_SWAP_THRESHOLD (((AVAILABLE_MEMORY) * 10) / (vm_compressor_majorcompact_threshold_divisor ? vm_compressor_majorcompact_threshold_divisor : 10))
#define VM_PAGE_COMPRESSOR_SWAP_UNTHROTTLE_THRESHOLD (((AVAILABLE_MEMORY) * 10) / (vm_compressor_unthrottle_threshold_divisor ? vm_compressor_unthrottle_threshold_divisor : 10))
#define VM_PAGE_COMPRESSOR_SWAP_RETHROTTLE_THRESHOLD (((AVAILABLE_MEMORY) * 11) / (vm_compressor_unthrottle_threshold_divisor ? vm_compressor_unthrottle_threshold_divisor : 11))
#define VM_PAGE_COMPRESSOR_SWAP_HAS_CAUGHTUP_THRESHOLD (((AVAILABLE_MEMORY) * 11) / (vm_compressor_catchup_threshold_divisor ? vm_compressor_catchup_threshold_divisor : 11))
#define VM_PAGE_COMPRESSOR_SWAP_CATCHUP_THRESHOLD (((AVAILABLE_MEMORY) * 10) / (vm_compressor_catchup_threshold_divisor ? vm_compressor_catchup_threshold_divisor : 10))
#define VM_PAGE_COMPRESSOR_HARD_THROTTLE_THRESHOLD (((AVAILABLE_MEMORY) * 9) / (vm_compressor_catchup_threshold_divisor ? vm_compressor_catchup_threshold_divisor : 9))
#if !XNU_TARGET_OS_OSX
#define AVAILABLE_NON_COMPRESSED_MIN 20000
#define COMPRESSOR_NEEDS_TO_SWAP() (((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_SWAP_THRESHOLD) || \
(AVAILABLE_NON_COMPRESSED_MEMORY < AVAILABLE_NON_COMPRESSED_MIN)) ? 1 : 0)
#else /* !XNU_TARGET_OS_OSX */
#define COMPRESSOR_NEEDS_TO_SWAP() ((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_SWAP_THRESHOLD) ? 1 : 0)
#endif /* !XNU_TARGET_OS_OSX */
#define HARD_THROTTLE_LIMIT_REACHED() ((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_HARD_THROTTLE_THRESHOLD) ? 1 : 0)
#define SWAPPER_NEEDS_TO_UNTHROTTLE() ((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_SWAP_UNTHROTTLE_THRESHOLD) ? 1 : 0)
#define SWAPPER_NEEDS_TO_RETHROTTLE() ((AVAILABLE_NON_COMPRESSED_MEMORY > VM_PAGE_COMPRESSOR_SWAP_RETHROTTLE_THRESHOLD) ? 1 : 0)
#define SWAPPER_NEEDS_TO_CATCHUP() ((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_SWAP_CATCHUP_THRESHOLD) ? 1 : 0)
#define SWAPPER_HAS_CAUGHTUP() ((AVAILABLE_NON_COMPRESSED_MEMORY > VM_PAGE_COMPRESSOR_SWAP_HAS_CAUGHTUP_THRESHOLD) ? 1 : 0)
#define COMPRESSOR_NEEDS_TO_MINOR_COMPACT() ((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_COMPACT_THRESHOLD) ? 1 : 0)
#if !XNU_TARGET_OS_OSX
#define COMPRESSOR_FREE_RESERVED_LIMIT 28
#else /* !XNU_TARGET_OS_OSX */
#define COMPRESSOR_FREE_RESERVED_LIMIT 128
#endif /* !XNU_TARGET_OS_OSX */
uint32_t vm_compressor_get_encode_scratch_size(void) __pure2;
uint32_t vm_compressor_get_decode_scratch_size(void) __pure2;
#define COMPRESSOR_SCRATCH_BUF_SIZE vm_compressor_get_encode_scratch_size()
#if RECORD_THE_COMPRESSED_DATA
extern void c_compressed_record_init(void);
extern void c_compressed_record_write(char *, int);
#endif
extern lck_mtx_t c_list_lock_storage;
#define c_list_lock (&c_list_lock_storage)
#if DEVELOPMENT || DEBUG
extern uint32_t vm_ktrace_enabled;
#define VMKDBG(x, ...) \
MACRO_BEGIN \
if (vm_ktrace_enabled) { \
KDBG(x, ## __VA_ARGS__);\
} \
MACRO_END
#if DEVELOPMENT || DEBUG
extern bool compressor_running_perf_test;
extern uint64_t compressor_perf_test_pages_processed;
#endif /* DEVELOPMENT || DEBUG */
#endif
#endif /* _VM_VM_COMPRESSOR_H_ */