#include <vm/vm_compressor.h>
#if CONFIG_PHANTOM_CACHE
#include <vm/vm_phantom_cache.h>
#endif
#include <vm/vm_map.h>
#include <vm/vm_pageout.h>
#include <vm/memory_object.h>
#include <vm/vm_compressor_algorithms.h>
#include <vm/vm_fault.h>
#include <vm/vm_protos.h>
#include <mach/mach_host.h>
#include <kern/ledger.h>
#include <kern/policy_internal.h>
#include <kern/thread_group.h>
#include <san/kasan.h>
#if defined(__x86_64__)
#include <i386/misc_protos.h>
#endif
#if defined(__arm64__)
#include <arm/machine_routines.h>
#endif
#include <IOKit/IOHibernatePrivate.h>
extern boolean_t vm_darkwake_mode;
extern zone_t vm_page_zone;
#if DEVELOPMENT || DEBUG
int do_cseg_wedge_thread(void);
int do_cseg_unwedge_thread(void);
static event_t debug_cseg_wait_event = NULL;
#endif
#if CONFIG_FREEZE
bool freezer_incore_cseg_acct = TRUE;
void task_disown_frozen_csegs(task_t owner_task);
#endif
#if POPCOUNT_THE_COMPRESSED_DATA
boolean_t popcount_c_segs = TRUE;
static inline uint32_t
vmc_pop(uintptr_t ins, int sz)
{
uint32_t rv = 0;
if (__probable(popcount_c_segs == FALSE)) {
return 0xDEAD707C;
}
while (sz >= 16) {
uint32_t rv1, rv2;
uint64_t *ins64 = (uint64_t *) ins;
uint64_t *ins642 = (uint64_t *) (ins + 8);
rv1 = __builtin_popcountll(*ins64);
rv2 = __builtin_popcountll(*ins642);
rv += rv1 + rv2;
sz -= 16;
ins += 16;
}
while (sz >= 4) {
uint32_t *ins32 = (uint32_t *) ins;
rv += __builtin_popcount(*ins32);
sz -= 4;
ins += 4;
}
while (sz > 0) {
char *ins8 = (char *)ins;
rv += __builtin_popcount(*ins8);
sz--;
ins++;
}
return rv;
}
#endif
#if VALIDATE_C_SEGMENTS
boolean_t validate_c_segs = TRUE;
#endif
#if !XNU_TARGET_OS_OSX
#if CONFIG_FREEZE
int vm_compressor_mode = VM_PAGER_FREEZER_DEFAULT;
struct freezer_context freezer_context_global;
#else
int vm_compressor_mode = VM_PAGER_NOT_CONFIGURED;
#endif
#else
int vm_compressor_mode = VM_PAGER_COMPRESSOR_WITH_SWAP;
#endif
TUNABLE(uint32_t, vm_compression_limit, "vm_compression_limit", 0);
int vm_compressor_is_active = 0;
int vm_compressor_available = 0;
extern uint64_t vm_swap_get_max_configured_space(void);
extern void vm_pageout_io_throttle(void);
#if CHECKSUM_THE_DATA || CHECKSUM_THE_SWAP || CHECKSUM_THE_COMPRESSED_DATA
extern unsigned int hash_string(char *cp, int len);
static unsigned int vmc_hash(char *, int);
boolean_t checksum_c_segs = TRUE;
unsigned int
vmc_hash(char *cp, int len)
{
if (__probable(checksum_c_segs == FALSE)) {
return 0xDEAD7A37;
}
return hash_string(cp, len);
}
#endif
#define UNPACK_C_SIZE(cs) ((cs->c_size == (PAGE_SIZE-1)) ? PAGE_SIZE : cs->c_size)
#define PACK_C_SIZE(cs, size) (cs->c_size = ((size == PAGE_SIZE) ? PAGE_SIZE - 1 : size))
struct c_sv_hash_entry {
union {
struct {
uint32_t c_sv_he_ref;
uint32_t c_sv_he_data;
} c_sv_he;
uint64_t c_sv_he_record;
} c_sv_he_un;
};
#define he_ref c_sv_he_un.c_sv_he.c_sv_he_ref
#define he_data c_sv_he_un.c_sv_he.c_sv_he_data
#define he_record c_sv_he_un.c_sv_he_record
#define C_SV_HASH_MAX_MISS 32
#define C_SV_HASH_SIZE ((1 << 10))
#define C_SV_HASH_MASK ((1 << 10) - 1)
#define C_SV_CSEG_ID ((1 << 22) - 1)
union c_segu {
c_segment_t c_seg;
uintptr_t c_segno;
};
#define C_SLOT_ASSERT_PACKABLE(ptr) \
VM_ASSERT_POINTER_PACKABLE((vm_offset_t)(ptr), C_SLOT_PACKED_PTR);
#define C_SLOT_PACK_PTR(ptr) \
VM_PACK_POINTER((vm_offset_t)(ptr), C_SLOT_PACKED_PTR)
#define C_SLOT_UNPACK_PTR(cslot) \
(c_slot_mapping_t)VM_UNPACK_POINTER((cslot)->c_packed_ptr, C_SLOT_PACKED_PTR)
SECURITY_READ_ONLY_EARLY(vm_packing_params_t) c_slot_packing_params =
VM_PACKING_PARAMS(C_SLOT_PACKED_PTR);
uint32_t c_segment_count = 0;
uint32_t c_segment_count_max = 0;
uint64_t c_generation_id = 0;
uint64_t c_generation_id_flush_barrier;
#define HIBERNATE_FLUSHING_SECS_TO_COMPLETE 120
boolean_t hibernate_no_swapspace = FALSE;
clock_sec_t hibernate_flushing_deadline = 0;
#if RECORD_THE_COMPRESSED_DATA
char *c_compressed_record_sbuf;
char *c_compressed_record_ebuf;
char *c_compressed_record_cptr;
#endif
queue_head_t c_age_list_head;
queue_head_t c_swappedin_list_head;
queue_head_t c_swapout_list_head;
queue_head_t c_swapio_list_head;
queue_head_t c_swappedout_list_head;
queue_head_t c_swappedout_sparse_list_head;
queue_head_t c_major_list_head;
queue_head_t c_filling_list_head;
queue_head_t c_bad_list_head;
uint32_t c_age_count = 0;
uint32_t c_swappedin_count = 0;
uint32_t c_swapout_count = 0;
uint32_t c_swapio_count = 0;
uint32_t c_swappedout_count = 0;
uint32_t c_swappedout_sparse_count = 0;
uint32_t c_major_count = 0;
uint32_t c_filling_count = 0;
uint32_t c_empty_count = 0;
uint32_t c_bad_count = 0;
queue_head_t c_minor_list_head;
uint32_t c_minor_count = 0;
int c_overage_swapped_count = 0;
int c_overage_swapped_limit = 0;
int c_seg_fixed_array_len;
union c_segu *c_segments;
vm_offset_t c_buffers;
vm_size_t c_buffers_size;
caddr_t c_segments_next_page;
boolean_t c_segments_busy;
uint32_t c_segments_available;
uint32_t c_segments_limit;
uint32_t c_segments_nearing_limit;
uint32_t c_segment_svp_in_hash;
uint32_t c_segment_svp_hash_succeeded;
uint32_t c_segment_svp_hash_failed;
uint32_t c_segment_svp_zero_compressions;
uint32_t c_segment_svp_nonzero_compressions;
uint32_t c_segment_svp_zero_decompressions;
uint32_t c_segment_svp_nonzero_decompressions;
uint32_t c_segment_noncompressible_pages;
uint32_t c_segment_pages_compressed = 0;
#if CONFIG_FREEZE
int32_t c_segment_pages_compressed_incore = 0;
uint32_t c_segments_incore_limit = 0;
#endif
uint32_t c_segment_pages_compressed_limit;
uint32_t c_segment_pages_compressed_nearing_limit;
uint32_t c_free_segno_head = (uint32_t)-1;
uint32_t vm_compressor_minorcompact_threshold_divisor = 10;
uint32_t vm_compressor_majorcompact_threshold_divisor = 10;
uint32_t vm_compressor_unthrottle_threshold_divisor = 10;
uint32_t vm_compressor_catchup_threshold_divisor = 10;
uint32_t vm_compressor_minorcompact_threshold_divisor_overridden = 0;
uint32_t vm_compressor_majorcompact_threshold_divisor_overridden = 0;
uint32_t vm_compressor_unthrottle_threshold_divisor_overridden = 0;
uint32_t vm_compressor_catchup_threshold_divisor_overridden = 0;
#define C_SEGMENTS_PER_PAGE (PAGE_SIZE / sizeof(union c_segu))
LCK_GRP_DECLARE(vm_compressor_lck_grp, "vm_compressor");
LCK_RW_DECLARE(c_master_lock, &vm_compressor_lck_grp);
LCK_MTX_DECLARE(c_list_lock_storage, &vm_compressor_lck_grp);
boolean_t decompressions_blocked = FALSE;
zone_t compressor_segment_zone;
int c_compressor_swap_trigger = 0;
uint32_t compressor_cpus;
char *compressor_scratch_bufs;
char *kdp_compressor_scratch_buf;
char *kdp_compressor_decompressed_page;
addr64_t kdp_compressor_decompressed_page_paddr;
ppnum_t kdp_compressor_decompressed_page_ppnum;
clock_sec_t start_of_sample_period_sec = 0;
clock_nsec_t start_of_sample_period_nsec = 0;
clock_sec_t start_of_eval_period_sec = 0;
clock_nsec_t start_of_eval_period_nsec = 0;
uint32_t sample_period_decompression_count = 0;
uint32_t sample_period_compression_count = 0;
uint32_t last_eval_decompression_count = 0;
uint32_t last_eval_compression_count = 0;
#define DECOMPRESSION_SAMPLE_MAX_AGE (60 * 30)
boolean_t vm_swapout_ripe_segments = FALSE;
uint32_t vm_ripe_target_age = (60 * 60 * 48);
uint32_t swapout_target_age = 0;
uint32_t age_of_decompressions_during_sample_period[DECOMPRESSION_SAMPLE_MAX_AGE];
uint32_t overage_decompressions_during_sample_period = 0;
void do_fastwake_warmup(queue_head_t *, boolean_t);
boolean_t fastwake_warmup = FALSE;
boolean_t fastwake_recording_in_progress = FALSE;
clock_sec_t dont_trim_until_ts = 0;
uint64_t c_segment_warmup_count;
uint64_t first_c_segment_to_warm_generation_id = 0;
uint64_t last_c_segment_to_warm_generation_id = 0;
boolean_t hibernate_flushing = FALSE;
int64_t c_segment_input_bytes __attribute__((aligned(8))) = 0;
int64_t c_segment_compressed_bytes __attribute__((aligned(8))) = 0;
int64_t compressor_bytes_used __attribute__((aligned(8))) = 0;
struct c_sv_hash_entry c_segment_sv_hash_table[C_SV_HASH_SIZE] __attribute__ ((aligned(8)));
static boolean_t compressor_needs_to_swap(void);
static void vm_compressor_swap_trigger_thread(void);
static void vm_compressor_do_delayed_compactions(boolean_t);
static void vm_compressor_compact_and_swap(boolean_t);
static void vm_compressor_age_swapped_in_segments(boolean_t);
#if XNU_TARGET_OS_OSX
static void vm_compressor_take_paging_space_action(void);
#endif
void compute_swapout_target_age(void);
boolean_t c_seg_major_compact(c_segment_t, c_segment_t);
boolean_t c_seg_major_compact_ok(c_segment_t, c_segment_t);
int c_seg_minor_compaction_and_unlock(c_segment_t, boolean_t);
int c_seg_do_minor_compaction_and_unlock(c_segment_t, boolean_t, boolean_t, boolean_t);
void c_seg_try_minor_compaction_and_unlock(c_segment_t c_seg);
void c_seg_move_to_sparse_list(c_segment_t);
void c_seg_insert_into_q(queue_head_t *, c_segment_t);
uint64_t vm_available_memory(void);
uint64_t vm_compressor_pages_compressed(void);
static inline boolean_t
vm_compressor_needs_to_major_compact()
{
uint32_t incore_seg_count;
incore_seg_count = c_segment_count - c_swappedout_count - c_swappedout_sparse_count;
if ((c_segment_count >= (c_segments_nearing_limit / 8)) &&
((incore_seg_count * C_SEG_MAX_PAGES) - VM_PAGE_COMPRESSOR_COUNT) >
((incore_seg_count / 8) * C_SEG_MAX_PAGES)) {
return 1;
}
return 0;
}
uint64_t
vm_available_memory(void)
{
return ((uint64_t)AVAILABLE_NON_COMPRESSED_MEMORY) * PAGE_SIZE_64;
}
uint64_t
vm_compressor_pages_compressed(void)
{
return c_segment_pages_compressed * PAGE_SIZE_64;
}
boolean_t
vm_compressor_low_on_space(void)
{
#if CONFIG_FREEZE
uint64_t incore_seg_count;
uint32_t incore_compressed_pages;
if (freezer_incore_cseg_acct) {
incore_seg_count = c_segment_count - c_swappedout_count - c_swappedout_sparse_count;
incore_compressed_pages = c_segment_pages_compressed_incore;
} else {
incore_seg_count = c_segment_count;
incore_compressed_pages = c_segment_pages_compressed;
}
if ((incore_compressed_pages > c_segment_pages_compressed_nearing_limit) ||
(incore_seg_count > c_segments_nearing_limit)) {
return TRUE;
}
#else
if ((c_segment_pages_compressed > c_segment_pages_compressed_nearing_limit) ||
(c_segment_count > c_segments_nearing_limit)) {
return TRUE;
}
#endif
return FALSE;
}
boolean_t
vm_compressor_out_of_space(void)
{
#if CONFIG_FREEZE
uint64_t incore_seg_count;
uint32_t incore_compressed_pages;
if (freezer_incore_cseg_acct) {
incore_seg_count = c_segment_count - c_swappedout_count - c_swappedout_sparse_count;
incore_compressed_pages = c_segment_pages_compressed_incore;
} else {
incore_seg_count = c_segment_count;
incore_compressed_pages = c_segment_pages_compressed;
}
if ((incore_compressed_pages >= c_segment_pages_compressed_limit) ||
(incore_seg_count > c_segments_incore_limit)) {
return TRUE;
}
#else
if ((c_segment_pages_compressed >= c_segment_pages_compressed_limit) ||
(c_segment_count >= c_segments_limit)) {
return TRUE;
}
#endif
return FALSE;
}
int
vm_wants_task_throttled(task_t task)
{
if (task == kernel_task) {
return 0;
}
if (VM_CONFIG_SWAP_IS_ACTIVE) {
if ((vm_compressor_low_on_space() || HARD_THROTTLE_LIMIT_REACHED()) &&
(unsigned int)pmap_compressed(task->map->pmap) > (c_segment_pages_compressed / 4)) {
return 1;
}
}
return 0;
}
#if DEVELOPMENT || DEBUG
TUNABLE(bool, kill_on_no_paging_space, "-kill_on_no_paging_space", false);
#endif
#if XNU_TARGET_OS_OSX
static uint32_t no_paging_space_action_in_progress = 0;
extern void memorystatus_send_low_swap_note(void);
static void
vm_compressor_take_paging_space_action(void)
{
if (no_paging_space_action_in_progress == 0) {
if (OSCompareAndSwap(0, 1, (UInt32 *)&no_paging_space_action_in_progress)) {
if (no_paging_space_action()) {
#if DEVELOPMENT || DEBUG
if (kill_on_no_paging_space) {
no_paging_space_action_in_progress = 0;
return;
}
#endif
memorystatus_send_low_swap_note();
}
no_paging_space_action_in_progress = 0;
}
}
}
#endif
void
vm_decompressor_lock(void)
{
PAGE_REPLACEMENT_ALLOWED(TRUE);
decompressions_blocked = TRUE;
PAGE_REPLACEMENT_ALLOWED(FALSE);
}
void
vm_decompressor_unlock(void)
{
PAGE_REPLACEMENT_ALLOWED(TRUE);
decompressions_blocked = FALSE;
PAGE_REPLACEMENT_ALLOWED(FALSE);
thread_wakeup((event_t)&decompressions_blocked);
}
static inline void
cslot_copy(c_slot_t cdst, c_slot_t csrc)
{
#if CHECKSUM_THE_DATA
cdst->c_hash_data = csrc->c_hash_data;
#endif
#if CHECKSUM_THE_COMPRESSED_DATA
cdst->c_hash_compressed_data = csrc->c_hash_compressed_data;
#endif
#if POPCOUNT_THE_COMPRESSED_DATA
cdst->c_pop_cdata = csrc->c_pop_cdata;
#endif
cdst->c_size = csrc->c_size;
cdst->c_packed_ptr = csrc->c_packed_ptr;
#if defined(__arm__) || defined(__arm64__)
cdst->c_codec = csrc->c_codec;
#endif
#if __ARM_WKDM_POPCNT__
cdst->c_inline_popcount = csrc->c_inline_popcount;
#endif
}
vm_map_t compressor_map;
uint64_t compressor_pool_max_size;
uint64_t compressor_pool_size;
uint32_t compressor_pool_multiplier;
#if DEVELOPMENT || DEBUG
boolean_t write_protect_c_segs = TRUE;
int vm_compressor_test_seg_wp;
uint32_t vm_ktrace_enabled;
#endif
void
vm_compressor_init(void)
{
thread_t thread;
int attempts = 1;
kern_return_t retval = KERN_SUCCESS;
vm_offset_t start_addr = 0;
vm_size_t c_segments_arr_size = 0, compressor_submap_size = 0;
vm_map_kernel_flags_t vmk_flags;
#if RECORD_THE_COMPRESSED_DATA
vm_size_t c_compressed_record_sbuf_size = 0;
#endif
#if DEVELOPMENT || DEBUG || CONFIG_FREEZE
char bootarg_name[32];
#endif
#if DEVELOPMENT || DEBUG
if (PE_parse_boot_argn("-disable_cseg_write_protection", bootarg_name, sizeof(bootarg_name))) {
write_protect_c_segs = FALSE;
}
int vmcval = 1;
PE_parse_boot_argn("vm_compressor_validation", &vmcval, sizeof(vmcval));
if (kern_feature_override(KF_COMPRSV_OVRD)) {
vmcval = 0;
}
if (vmcval == 0) {
#if POPCOUNT_THE_COMPRESSED_DATA
popcount_c_segs = FALSE;
#endif
#if CHECKSUM_THE_DATA || CHECKSUM_THE_COMPRESSED_DATA
checksum_c_segs = FALSE;
#endif
#if VALIDATE_C_SEGMENTS
validate_c_segs = FALSE;
#endif
write_protect_c_segs = FALSE;
}
#endif
#if CONFIG_FREEZE
if (PE_parse_boot_argn("-disable_freezer_cseg_acct", bootarg_name, sizeof(bootarg_name))) {
freezer_incore_cseg_acct = FALSE;
}
#endif
assert((C_SEGMENTS_PER_PAGE * sizeof(union c_segu)) == PAGE_SIZE);
#if !XNU_TARGET_OS_OSX
vm_compressor_minorcompact_threshold_divisor = 20;
vm_compressor_majorcompact_threshold_divisor = 30;
vm_compressor_unthrottle_threshold_divisor = 40;
vm_compressor_catchup_threshold_divisor = 60;
#else
if (max_mem <= (3ULL * 1024ULL * 1024ULL * 1024ULL)) {
vm_compressor_minorcompact_threshold_divisor = 11;
vm_compressor_majorcompact_threshold_divisor = 13;
vm_compressor_unthrottle_threshold_divisor = 20;
vm_compressor_catchup_threshold_divisor = 35;
} else {
vm_compressor_minorcompact_threshold_divisor = 20;
vm_compressor_majorcompact_threshold_divisor = 25;
vm_compressor_unthrottle_threshold_divisor = 35;
vm_compressor_catchup_threshold_divisor = 50;
}
#endif
queue_init(&c_bad_list_head);
queue_init(&c_age_list_head);
queue_init(&c_minor_list_head);
queue_init(&c_major_list_head);
queue_init(&c_filling_list_head);
queue_init(&c_swapout_list_head);
queue_init(&c_swapio_list_head);
queue_init(&c_swappedin_list_head);
queue_init(&c_swappedout_list_head);
queue_init(&c_swappedout_sparse_list_head);
c_free_segno_head = -1;
c_segments_available = 0;
if (vm_compression_limit) {
compressor_pool_size = ptoa_64(vm_compression_limit);
}
compressor_pool_max_size = C_SEG_MAX_LIMIT;
compressor_pool_max_size *= C_SEG_BUFSIZE;
#if XNU_TARGET_OS_OSX
if (vm_compression_limit == 0) {
if (max_mem <= (4ULL * 1024ULL * 1024ULL * 1024ULL)) {
compressor_pool_size = 16ULL * max_mem;
} else if (max_mem <= (8ULL * 1024ULL * 1024ULL * 1024ULL)) {
compressor_pool_size = 8ULL * max_mem;
} else if (max_mem <= (32ULL * 1024ULL * 1024ULL * 1024ULL)) {
compressor_pool_size = 4ULL * max_mem;
} else {
compressor_pool_size = 2ULL * max_mem;
}
}
if (max_mem <= (8ULL * 1024ULL * 1024ULL * 1024ULL)) {
compressor_pool_multiplier = 1;
} else if (max_mem <= (32ULL * 1024ULL * 1024ULL * 1024ULL)) {
compressor_pool_multiplier = 2;
} else {
compressor_pool_multiplier = 4;
}
#elif defined(__arm__)
#define VM_RESERVE_SIZE (1024 * 1024 * 256)
#define MAX_COMPRESSOR_POOL_SIZE (1024 * 1024 * 450)
if (compressor_pool_max_size > MAX_COMPRESSOR_POOL_SIZE) {
compressor_pool_max_size = MAX_COMPRESSOR_POOL_SIZE;
}
if (vm_compression_limit == 0) {
compressor_pool_size = ((kernel_map->max_offset - kernel_map->min_offset) - kernel_map->size) - VM_RESERVE_SIZE;
}
compressor_pool_multiplier = 1;
#elif defined(__arm64__) && defined(XNU_TARGET_OS_WATCH)
#define COMPRESSOR_CAP_PERCENTAGE 37ULL
if (compressor_pool_max_size > max_mem) {
compressor_pool_max_size = max_mem;
}
if (vm_compression_limit == 0) {
compressor_pool_size = (max_mem * COMPRESSOR_CAP_PERCENTAGE) / 100ULL;
}
compressor_pool_multiplier = 1;
#else
if (compressor_pool_max_size > max_mem) {
compressor_pool_max_size = max_mem;
}
if (vm_compression_limit == 0) {
compressor_pool_size = max_mem;
}
compressor_pool_multiplier = 1;
#endif
if (compressor_pool_size > compressor_pool_max_size) {
compressor_pool_size = compressor_pool_max_size;
}
try_again:
c_segments_limit = (uint32_t)(compressor_pool_size / (vm_size_t)(C_SEG_ALLOCSIZE));
c_segments_nearing_limit = (uint32_t)(((uint64_t)c_segments_limit * 98ULL) / 100ULL);
c_segment_pages_compressed_limit = (c_segments_limit * (C_SEG_BUFSIZE / PAGE_SIZE) * compressor_pool_multiplier);
if (c_segment_pages_compressed_limit < (uint32_t)(max_mem / PAGE_SIZE)) {
if (!vm_compression_limit) {
c_segment_pages_compressed_limit = (uint32_t)(max_mem / PAGE_SIZE);
}
}
c_segment_pages_compressed_nearing_limit = (uint32_t)(((uint64_t)c_segment_pages_compressed_limit * 98ULL) / 100ULL);
#if CONFIG_FREEZE
c_segments_incore_limit = c_segments_limit;
if (freezer_incore_cseg_acct) {
c_segments_limit += (uint32_t)(vm_swap_get_max_configured_space() / (vm_size_t)(C_SEG_ALLOCSIZE));
}
#endif
c_segments_arr_size = vm_map_round_page((sizeof(union c_segu) * c_segments_limit), VM_MAP_PAGE_MASK(kernel_map));
c_buffers_size = vm_map_round_page(((vm_size_t)C_SEG_ALLOCSIZE * (vm_size_t)c_segments_limit), VM_MAP_PAGE_MASK(kernel_map));
compressor_submap_size = c_segments_arr_size + c_buffers_size + C_SEG_BUFSIZE;
#if RECORD_THE_COMPRESSED_DATA
c_compressed_record_sbuf_size = (vm_size_t)C_SEG_ALLOCSIZE + (PAGE_SIZE * 2);
compressor_submap_size += c_compressed_record_sbuf_size;
#endif
vmk_flags = VM_MAP_KERNEL_FLAGS_NONE;
vmk_flags.vmkf_permanent = TRUE;
retval = kmem_suballoc(kernel_map, &start_addr, compressor_submap_size,
FALSE, VM_FLAGS_ANYWHERE, vmk_flags, VM_KERN_MEMORY_COMPRESSOR,
&compressor_map);
if (retval != KERN_SUCCESS) {
if (++attempts > 3) {
panic("vm_compressor_init: kmem_suballoc failed - 0x%llx", (uint64_t)compressor_submap_size);
}
compressor_pool_size = compressor_pool_size / 2;
kprintf("retrying creation of the compressor submap at 0x%llx bytes\n", compressor_pool_size);
goto try_again;
}
if (kernel_memory_allocate(compressor_map, (vm_offset_t *)(&c_segments),
(sizeof(union c_segu) * c_segments_limit), 0,
KMA_KOBJECT | KMA_VAONLY | KMA_PERMANENT, VM_KERN_MEMORY_COMPRESSOR) != KERN_SUCCESS) {
panic("vm_compressor_init: kernel_memory_allocate failed - c_segments\n");
}
if (kernel_memory_allocate(compressor_map, &c_buffers, c_buffers_size, 0,
KMA_COMPRESSOR | KMA_VAONLY | KMA_PERMANENT, VM_KERN_MEMORY_COMPRESSOR) != KERN_SUCCESS) {
panic("vm_compressor_init: kernel_memory_allocate failed - c_buffers\n");
}
uint32_t c_segment_size = sizeof(struct c_segment) + (C_SEG_SLOT_VAR_ARRAY_MIN_LEN * sizeof(struct c_slot));
uint32_t cnt = (16 << 10) / c_segment_size;
uint32_t frag = (16 << 10) % c_segment_size;
c_seg_fixed_array_len = C_SEG_SLOT_VAR_ARRAY_MIN_LEN;
while (cnt * sizeof(struct c_slot) < frag) {
c_segment_size += sizeof(struct c_slot);
c_seg_fixed_array_len++;
frag -= cnt * sizeof(struct c_slot);
}
compressor_segment_zone = zone_create("compressor_segment",
c_segment_size, ZC_NOENCRYPT | ZC_ZFREE_CLEARMEM);
c_segments_busy = FALSE;
c_segments_next_page = (caddr_t)c_segments;
vm_compressor_algorithm_init();
{
host_basic_info_data_t hinfo;
mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
size_t bufsize;
char *buf;
#define BSD_HOST 1
host_info((host_t)BSD_HOST, HOST_BASIC_INFO, (host_info_t)&hinfo, &count);
compressor_cpus = hinfo.max_cpus;
bufsize = PAGE_SIZE;
bufsize += compressor_cpus * vm_compressor_get_decode_scratch_size();
bufsize += vm_compressor_get_decode_scratch_size();
#if CONFIG_FREEZE
bufsize += vm_compressor_get_encode_scratch_size();
#endif
#if RECORD_THE_COMPRESSED_DATA
bufsize += c_compressed_record_sbuf_size;
#endif
if (kernel_memory_allocate(kernel_map, (vm_offset_t *)&buf, bufsize,
PAGE_MASK, KMA_KOBJECT | KMA_PERMANENT, VM_KERN_MEMORY_COMPRESSOR)) {
panic("vm_compressor_init: Unable to allocate %zd bytes", bufsize);
}
kdp_compressor_decompressed_page = buf;
kdp_compressor_decompressed_page_paddr = kvtophys((vm_offset_t)kdp_compressor_decompressed_page);
kdp_compressor_decompressed_page_ppnum = (ppnum_t) atop(kdp_compressor_decompressed_page_paddr);
buf += PAGE_SIZE;
bufsize -= PAGE_SIZE;
compressor_scratch_bufs = buf;
buf += compressor_cpus * vm_compressor_get_decode_scratch_size();
bufsize -= compressor_cpus * vm_compressor_get_decode_scratch_size();
kdp_compressor_scratch_buf = buf;
buf += vm_compressor_get_decode_scratch_size();
bufsize -= vm_compressor_get_decode_scratch_size();
#if CONFIG_FREEZE
freezer_context_global.freezer_ctx_compressor_scratch_buf = buf;
buf += vm_compressor_get_encode_scratch_size();
bufsize -= vm_compressor_get_encode_scratch_size();
#endif
#if RECORD_THE_COMPRESSED_DATA
c_compressed_record_sbuf = buf;
c_compressed_record_cptr = buf;
c_compressed_record_ebuf = c_compressed_record_sbuf + c_compressed_record_sbuf_size;
buf += c_compressed_record_sbuf_size;
bufsize -= c_compressed_record_sbuf_size;
#endif
assert(bufsize == 0);
}
if (kernel_thread_start_priority((thread_continue_t)vm_compressor_swap_trigger_thread, NULL,
BASEPRI_VM, &thread) != KERN_SUCCESS) {
panic("vm_compressor_swap_trigger_thread: create failed");
}
thread_deallocate(thread);
if (vm_pageout_internal_start() != KERN_SUCCESS) {
panic("vm_compressor_init: Failed to start the internal pageout thread.\n");
}
if (VM_CONFIG_SWAP_IS_PRESENT) {
vm_compressor_swap_init();
}
if (VM_CONFIG_COMPRESSOR_IS_ACTIVE) {
vm_compressor_is_active = 1;
}
#if CONFIG_FREEZE
memorystatus_freeze_enabled = TRUE;
#endif
vm_compressor_available = 1;
vm_page_reactivate_all_throttled();
}
#if VALIDATE_C_SEGMENTS
static void
c_seg_validate(c_segment_t c_seg, boolean_t must_be_compact)
{
uint16_t c_indx;
int32_t bytes_used;
uint32_t c_rounded_size;
uint32_t c_size;
c_slot_t cs;
if (__probable(validate_c_segs == FALSE)) {
return;
}
if (c_seg->c_firstemptyslot < c_seg->c_nextslot) {
c_indx = c_seg->c_firstemptyslot;
cs = C_SEG_SLOT_FROM_INDEX(c_seg, c_indx);
if (cs == NULL) {
panic("c_seg_validate: no slot backing c_firstemptyslot");
}
if (cs->c_size) {
panic("c_seg_validate: c_firstemptyslot has non-zero size (%d)\n", cs->c_size);
}
}
bytes_used = 0;
for (c_indx = 0; c_indx < c_seg->c_nextslot; c_indx++) {
cs = C_SEG_SLOT_FROM_INDEX(c_seg, c_indx);
c_size = UNPACK_C_SIZE(cs);
c_rounded_size = (c_size + C_SEG_OFFSET_ALIGNMENT_MASK) & ~C_SEG_OFFSET_ALIGNMENT_MASK;
bytes_used += c_rounded_size;
#if CHECKSUM_THE_COMPRESSED_DATA
unsigned csvhash;
if (c_size && cs->c_hash_compressed_data != (csvhash = vmc_hash((char *)&c_seg->c_store.c_buffer[cs->c_offset], c_size))) {
addr64_t csvphys = kvtophys((vm_offset_t)&c_seg->c_store.c_buffer[cs->c_offset]);
panic("Compressed data doesn't match original %p phys: 0x%llx %d %p %d %d 0x%x 0x%x", c_seg, csvphys, cs->c_offset, cs, c_indx, c_size, cs->c_hash_compressed_data, csvhash);
}
#endif
#if POPCOUNT_THE_COMPRESSED_DATA
unsigned csvpop;
if (c_size) {
uintptr_t csvaddr = (uintptr_t) &c_seg->c_store.c_buffer[cs->c_offset];
if (cs->c_pop_cdata != (csvpop = vmc_pop(csvaddr, c_size))) {
panic("Compressed data popcount doesn't match original, bit distance: %d %p (phys: %p) %p %p 0x%llx 0x%x 0x%x 0x%x", (csvpop - cs->c_pop_cdata), (void *)csvaddr, (void *) kvtophys(csvaddr), c_seg, cs, (uint64_t)cs->c_offset, c_size, csvpop, cs->c_pop_cdata);
}
}
#endif
}
if (bytes_used != c_seg->c_bytes_used) {
panic("c_seg_validate: bytes_used mismatch - found %d, segment has %d\n", bytes_used, c_seg->c_bytes_used);
}
if (c_seg->c_bytes_used > C_SEG_OFFSET_TO_BYTES((int32_t)c_seg->c_nextoffset)) {
panic("c_seg_validate: c_bytes_used > c_nextoffset - c_nextoffset = %d, c_bytes_used = %d\n",
(int32_t)C_SEG_OFFSET_TO_BYTES((int32_t)c_seg->c_nextoffset), c_seg->c_bytes_used);
}
if (must_be_compact) {
if (c_seg->c_bytes_used != C_SEG_OFFSET_TO_BYTES((int32_t)c_seg->c_nextoffset)) {
panic("c_seg_validate: c_bytes_used doesn't match c_nextoffset - c_nextoffset = %d, c_bytes_used = %d\n",
(int32_t)C_SEG_OFFSET_TO_BYTES((int32_t)c_seg->c_nextoffset), c_seg->c_bytes_used);
}
}
}
#endif
void
c_seg_need_delayed_compaction(c_segment_t c_seg, boolean_t c_list_lock_held)
{
boolean_t clear_busy = FALSE;
if (c_list_lock_held == FALSE) {
if (!lck_mtx_try_lock_spin_always(c_list_lock)) {
C_SEG_BUSY(c_seg);
lck_mtx_unlock_always(&c_seg->c_lock);
lck_mtx_lock_spin_always(c_list_lock);
lck_mtx_lock_spin_always(&c_seg->c_lock);
clear_busy = TRUE;
}
}
assert(c_seg->c_state != C_IS_FILLING);
if (!c_seg->c_on_minorcompact_q && !(C_SEG_IS_ON_DISK_OR_SOQ(c_seg))) {
queue_enter(&c_minor_list_head, c_seg, c_segment_t, c_list);
c_seg->c_on_minorcompact_q = 1;
c_minor_count++;
}
if (c_list_lock_held == FALSE) {
lck_mtx_unlock_always(c_list_lock);
}
if (clear_busy == TRUE) {
C_SEG_WAKEUP_DONE(c_seg);
}
}
unsigned int c_seg_moved_to_sparse_list = 0;
void
c_seg_move_to_sparse_list(c_segment_t c_seg)
{
boolean_t clear_busy = FALSE;
if (!lck_mtx_try_lock_spin_always(c_list_lock)) {
C_SEG_BUSY(c_seg);
lck_mtx_unlock_always(&c_seg->c_lock);
lck_mtx_lock_spin_always(c_list_lock);
lck_mtx_lock_spin_always(&c_seg->c_lock);
clear_busy = TRUE;
}
c_seg_switch_state(c_seg, C_ON_SWAPPEDOUTSPARSE_Q, FALSE);
c_seg_moved_to_sparse_list++;
lck_mtx_unlock_always(c_list_lock);
if (clear_busy == TRUE) {
C_SEG_WAKEUP_DONE(c_seg);
}
}
void
c_seg_insert_into_q(queue_head_t *qhead, c_segment_t c_seg)
{
c_segment_t c_seg_next;
if (queue_empty(qhead)) {
queue_enter(qhead, c_seg, c_segment_t, c_age_list);
} else {
c_seg_next = (c_segment_t)queue_first(qhead);
while (TRUE) {
if (c_seg->c_generation_id < c_seg_next->c_generation_id) {
queue_insert_before(qhead, c_seg, c_seg_next, c_segment_t, c_age_list);
break;
}
c_seg_next = (c_segment_t) queue_next(&c_seg_next->c_age_list);
if (queue_end(qhead, (queue_entry_t) c_seg_next)) {
queue_enter(qhead, c_seg, c_segment_t, c_age_list);
break;
}
}
}
}
int try_minor_compaction_failed = 0;
int try_minor_compaction_succeeded = 0;
void
c_seg_try_minor_compaction_and_unlock(c_segment_t c_seg)
{
assert(c_seg->c_on_minorcompact_q);
if (!lck_mtx_try_lock_spin_always(c_list_lock)) {
try_minor_compaction_failed++;
lck_mtx_unlock_always(&c_seg->c_lock);
} else {
try_minor_compaction_succeeded++;
C_SEG_BUSY(c_seg);
c_seg_do_minor_compaction_and_unlock(c_seg, TRUE, FALSE, FALSE);
}
}
int
c_seg_do_minor_compaction_and_unlock(c_segment_t c_seg, boolean_t clear_busy, boolean_t need_list_lock, boolean_t disallow_page_replacement)
{
int c_seg_freed;
assert(c_seg->c_busy);
assert(!C_SEG_IS_ON_DISK_OR_SOQ(c_seg));
if (c_seg->c_state == C_ON_MAJORCOMPACT_Q && C_SEG_SHOULD_MAJORCOMPACT_NOW(c_seg)) {
c_seg_switch_state(c_seg, C_ON_AGE_Q, FALSE);
}
if (!c_seg->c_on_minorcompact_q) {
if (clear_busy == TRUE) {
C_SEG_WAKEUP_DONE(c_seg);
}
lck_mtx_unlock_always(&c_seg->c_lock);
return 0;
}
queue_remove(&c_minor_list_head, c_seg, c_segment_t, c_list);
c_seg->c_on_minorcompact_q = 0;
c_minor_count--;
lck_mtx_unlock_always(c_list_lock);
if (disallow_page_replacement == TRUE) {
lck_mtx_unlock_always(&c_seg->c_lock);
PAGE_REPLACEMENT_DISALLOWED(TRUE);
lck_mtx_lock_spin_always(&c_seg->c_lock);
}
c_seg_freed = c_seg_minor_compaction_and_unlock(c_seg, clear_busy);
if (disallow_page_replacement == TRUE) {
PAGE_REPLACEMENT_DISALLOWED(FALSE);
}
if (need_list_lock == TRUE) {
lck_mtx_lock_spin_always(c_list_lock);
}
return c_seg_freed;
}
void
kdp_compressor_busy_find_owner(event64_t wait_event, thread_waitinfo_t *waitinfo)
{
c_segment_t c_seg = (c_segment_t) wait_event;
waitinfo->owner = thread_tid(c_seg->c_busy_for_thread);
waitinfo->context = VM_KERNEL_UNSLIDE_OR_PERM(c_seg);
}
#if DEVELOPMENT || DEBUG
int
do_cseg_wedge_thread(void)
{
struct c_segment c_seg;
c_seg.c_busy_for_thread = current_thread();
debug_cseg_wait_event = (event_t) &c_seg;
thread_set_pending_block_hint(current_thread(), kThreadWaitCompressor);
assert_wait((event_t) (&c_seg), THREAD_INTERRUPTIBLE);
thread_block(THREAD_CONTINUE_NULL);
return 0;
}
int
do_cseg_unwedge_thread(void)
{
thread_wakeup(debug_cseg_wait_event);
debug_cseg_wait_event = NULL;
return 0;
}
#endif
void
c_seg_wait_on_busy(c_segment_t c_seg)
{
c_seg->c_wanted = 1;
thread_set_pending_block_hint(current_thread(), kThreadWaitCompressor);
assert_wait((event_t) (c_seg), THREAD_UNINT);
lck_mtx_unlock_always(&c_seg->c_lock);
thread_block(THREAD_CONTINUE_NULL);
}
#if CONFIG_FREEZE
void
c_seg_update_task_owner(c_segment_t c_seg, task_t new_owner_task)
{
task_t owner_task = c_seg->c_task_owner;
uint64_t uncompressed_bytes = ((c_seg->c_slots_used) * PAGE_SIZE_64);
LCK_MTX_ASSERT(c_list_lock, LCK_MTX_ASSERT_OWNED);
LCK_MTX_ASSERT(&c_seg->c_lock, LCK_MTX_ASSERT_OWNED);
if (owner_task) {
task_update_frozen_to_swap_acct(owner_task, uncompressed_bytes, DEBIT_FROM_SWAP);
queue_remove(&owner_task->task_frozen_cseg_q, c_seg,
c_segment_t, c_task_list_next_cseg);
}
if (new_owner_task) {
queue_enter(&new_owner_task->task_frozen_cseg_q, c_seg,
c_segment_t, c_task_list_next_cseg);
task_update_frozen_to_swap_acct(new_owner_task, uncompressed_bytes, CREDIT_TO_SWAP);
}
c_seg->c_task_owner = new_owner_task;
}
void
task_disown_frozen_csegs(task_t owner_task)
{
c_segment_t c_seg = NULL, next_cseg = NULL;
again:
PAGE_REPLACEMENT_DISALLOWED(TRUE);
lck_mtx_lock_spin_always(c_list_lock);
for (c_seg = (c_segment_t) queue_first(&owner_task->task_frozen_cseg_q);
!queue_end(&owner_task->task_frozen_cseg_q, (queue_entry_t) c_seg);
c_seg = next_cseg) {
next_cseg = (c_segment_t) queue_next(&c_seg->c_task_list_next_cseg);;
if (!lck_mtx_try_lock_spin_always(&c_seg->c_lock)) {
lck_mtx_unlock(c_list_lock);
PAGE_REPLACEMENT_DISALLOWED(FALSE);
goto again;
}
if (c_seg->c_busy) {
lck_mtx_unlock(c_list_lock);
PAGE_REPLACEMENT_DISALLOWED(FALSE);
c_seg_wait_on_busy(c_seg);
goto again;
}
assert(c_seg->c_task_owner == owner_task);
c_seg_update_task_owner(c_seg, kernel_task);
lck_mtx_unlock_always(&c_seg->c_lock);
}
lck_mtx_unlock(c_list_lock);
PAGE_REPLACEMENT_DISALLOWED(FALSE);
}
#endif
void
c_seg_switch_state(c_segment_t c_seg, int new_state, boolean_t insert_head)
{
int old_state = c_seg->c_state;
#if XNU_TARGET_OS_OSX
#if DEVELOPMENT || DEBUG
if (new_state != C_IS_FILLING) {
LCK_MTX_ASSERT(&c_seg->c_lock, LCK_MTX_ASSERT_OWNED);
}
LCK_MTX_ASSERT(c_list_lock, LCK_MTX_ASSERT_OWNED);
#endif
#endif
switch (old_state) {
case C_IS_EMPTY:
assert(new_state == C_IS_FILLING || new_state == C_IS_FREE);
c_empty_count--;
break;
case C_IS_FILLING:
assert(new_state == C_ON_AGE_Q || new_state == C_ON_SWAPOUT_Q);
queue_remove(&c_filling_list_head, c_seg, c_segment_t, c_age_list);
c_filling_count--;
break;
case C_ON_AGE_Q:
assert(new_state == C_ON_SWAPOUT_Q || new_state == C_ON_MAJORCOMPACT_Q ||
new_state == C_IS_FREE);
queue_remove(&c_age_list_head, c_seg, c_segment_t, c_age_list);
c_age_count--;
break;
case C_ON_SWAPPEDIN_Q:
assert(new_state == C_ON_AGE_Q || new_state == C_IS_FREE);
queue_remove(&c_swappedin_list_head, c_seg, c_segment_t, c_age_list);
c_swappedin_count--;
break;
case C_ON_SWAPOUT_Q:
assert(new_state == C_ON_AGE_Q || new_state == C_IS_FREE || new_state == C_IS_EMPTY || new_state == C_ON_SWAPIO_Q);
#if CONFIG_FREEZE
if (c_seg->c_task_owner && (new_state != C_ON_SWAPIO_Q)) {
c_seg_update_task_owner(c_seg, NULL);
}
#endif
queue_remove(&c_swapout_list_head, c_seg, c_segment_t, c_age_list);
thread_wakeup((event_t)&compaction_swapper_running);
c_swapout_count--;
break;
case C_ON_SWAPIO_Q:
assert(new_state == C_ON_SWAPPEDOUT_Q || new_state == C_ON_SWAPPEDOUTSPARSE_Q || new_state == C_ON_AGE_Q);
queue_remove(&c_swapio_list_head, c_seg, c_segment_t, c_age_list);
c_swapio_count--;
break;
case C_ON_SWAPPEDOUT_Q:
assert(new_state == C_ON_SWAPPEDIN_Q || new_state == C_ON_AGE_Q ||
new_state == C_ON_SWAPPEDOUTSPARSE_Q ||
new_state == C_ON_BAD_Q || new_state == C_IS_EMPTY || new_state == C_IS_FREE);
queue_remove(&c_swappedout_list_head, c_seg, c_segment_t, c_age_list);
c_swappedout_count--;
break;
case C_ON_SWAPPEDOUTSPARSE_Q:
assert(new_state == C_ON_SWAPPEDIN_Q || new_state == C_ON_AGE_Q ||
new_state == C_ON_BAD_Q || new_state == C_IS_EMPTY || new_state == C_IS_FREE);
queue_remove(&c_swappedout_sparse_list_head, c_seg, c_segment_t, c_age_list);
c_swappedout_sparse_count--;
break;
case C_ON_MAJORCOMPACT_Q:
assert(new_state == C_ON_AGE_Q || new_state == C_IS_FREE);
queue_remove(&c_major_list_head, c_seg, c_segment_t, c_age_list);
c_major_count--;
break;
case C_ON_BAD_Q:
assert(new_state == C_IS_FREE);
queue_remove(&c_bad_list_head, c_seg, c_segment_t, c_age_list);
c_bad_count--;
break;
default:
panic("c_seg %p has bad c_state = %d\n", c_seg, old_state);
}
switch (new_state) {
case C_IS_FREE:
assert(old_state != C_IS_FILLING);
break;
case C_IS_EMPTY:
assert(old_state == C_ON_SWAPOUT_Q || old_state == C_ON_SWAPPEDOUT_Q || old_state == C_ON_SWAPPEDOUTSPARSE_Q);
c_empty_count++;
break;
case C_IS_FILLING:
assert(old_state == C_IS_EMPTY);
queue_enter(&c_filling_list_head, c_seg, c_segment_t, c_age_list);
c_filling_count++;
break;
case C_ON_AGE_Q:
assert(old_state == C_IS_FILLING || old_state == C_ON_SWAPPEDIN_Q ||
old_state == C_ON_SWAPOUT_Q || old_state == C_ON_SWAPIO_Q ||
old_state == C_ON_MAJORCOMPACT_Q || old_state == C_ON_SWAPPEDOUT_Q || old_state == C_ON_SWAPPEDOUTSPARSE_Q);
if (old_state == C_IS_FILLING) {
queue_enter(&c_age_list_head, c_seg, c_segment_t, c_age_list);
} else {
if (!queue_empty(&c_age_list_head)) {
c_segment_t c_first;
c_first = (c_segment_t)queue_first(&c_age_list_head);
c_seg->c_creation_ts = c_first->c_creation_ts;
}
queue_enter_first(&c_age_list_head, c_seg, c_segment_t, c_age_list);
}
c_age_count++;
break;
case C_ON_SWAPPEDIN_Q:
assert(old_state == C_ON_SWAPPEDOUT_Q || old_state == C_ON_SWAPPEDOUTSPARSE_Q);
if (insert_head == TRUE) {
queue_enter_first(&c_swappedin_list_head, c_seg, c_segment_t, c_age_list);
} else {
queue_enter(&c_swappedin_list_head, c_seg, c_segment_t, c_age_list);
}
c_swappedin_count++;
break;
case C_ON_SWAPOUT_Q:
assert(old_state == C_ON_AGE_Q || old_state == C_IS_FILLING);
if (insert_head == TRUE) {
queue_enter_first(&c_swapout_list_head, c_seg, c_segment_t, c_age_list);
} else {
queue_enter(&c_swapout_list_head, c_seg, c_segment_t, c_age_list);
}
c_swapout_count++;
break;
case C_ON_SWAPIO_Q:
assert(old_state == C_ON_SWAPOUT_Q);
if (insert_head == TRUE) {
queue_enter_first(&c_swapio_list_head, c_seg, c_segment_t, c_age_list);
} else {
queue_enter(&c_swapio_list_head, c_seg, c_segment_t, c_age_list);
}
c_swapio_count++;
break;
case C_ON_SWAPPEDOUT_Q:
assert(old_state == C_ON_SWAPIO_Q);
if (insert_head == TRUE) {
queue_enter_first(&c_swappedout_list_head, c_seg, c_segment_t, c_age_list);
} else {
queue_enter(&c_swappedout_list_head, c_seg, c_segment_t, c_age_list);
}
c_swappedout_count++;
break;
case C_ON_SWAPPEDOUTSPARSE_Q:
assert(old_state == C_ON_SWAPIO_Q || old_state == C_ON_SWAPPEDOUT_Q);
if (insert_head == TRUE) {
queue_enter_first(&c_swappedout_sparse_list_head, c_seg, c_segment_t, c_age_list);
} else {
queue_enter(&c_swappedout_sparse_list_head, c_seg, c_segment_t, c_age_list);
}
c_swappedout_sparse_count++;
break;
case C_ON_MAJORCOMPACT_Q:
assert(old_state == C_ON_AGE_Q);
if (insert_head == TRUE) {
queue_enter_first(&c_major_list_head, c_seg, c_segment_t, c_age_list);
} else {
queue_enter(&c_major_list_head, c_seg, c_segment_t, c_age_list);
}
c_major_count++;
break;
case C_ON_BAD_Q:
assert(old_state == C_ON_SWAPPEDOUT_Q || old_state == C_ON_SWAPPEDOUTSPARSE_Q);
if (insert_head == TRUE) {
queue_enter_first(&c_bad_list_head, c_seg, c_segment_t, c_age_list);
} else {
queue_enter(&c_bad_list_head, c_seg, c_segment_t, c_age_list);
}
c_bad_count++;
break;
default:
panic("c_seg %p requesting bad c_state = %d\n", c_seg, new_state);
}
c_seg->c_state = new_state;
}
void
c_seg_free(c_segment_t c_seg)
{
assert(c_seg->c_busy);
lck_mtx_unlock_always(&c_seg->c_lock);
lck_mtx_lock_spin_always(c_list_lock);
lck_mtx_lock_spin_always(&c_seg->c_lock);
c_seg_free_locked(c_seg);
}
void
c_seg_free_locked(c_segment_t c_seg)
{
int segno;
int pages_populated = 0;
int32_t *c_buffer = NULL;
uint64_t c_swap_handle = 0;
assert(c_seg->c_busy);
assert(c_seg->c_slots_used == 0);
assert(!c_seg->c_on_minorcompact_q);
assert(!c_seg->c_busy_swapping);
if (c_seg->c_overage_swap == TRUE) {
c_overage_swapped_count--;
c_seg->c_overage_swap = FALSE;
}
if (!(C_SEG_IS_ONDISK(c_seg))) {
c_buffer = c_seg->c_store.c_buffer;
} else {
c_swap_handle = c_seg->c_store.c_swap_handle;
}
c_seg_switch_state(c_seg, C_IS_FREE, FALSE);
if (c_buffer) {
pages_populated = (round_page_32(C_SEG_OFFSET_TO_BYTES(c_seg->c_populated_offset))) / PAGE_SIZE;
c_seg->c_store.c_buffer = NULL;
} else {
#if CONFIG_FREEZE
c_seg_update_task_owner(c_seg, NULL);
#endif
c_seg->c_store.c_swap_handle = (uint64_t)-1;
}
lck_mtx_unlock_always(&c_seg->c_lock);
lck_mtx_unlock_always(c_list_lock);
if (c_buffer) {
if (pages_populated) {
kernel_memory_depopulate(compressor_map, (vm_offset_t)c_buffer,
pages_populated * PAGE_SIZE, KMA_COMPRESSOR, VM_KERN_MEMORY_COMPRESSOR);
}
} else if (c_swap_handle) {
vm_swap_free(c_swap_handle);
}
lck_mtx_lock_spin_always(&c_seg->c_lock);
C_SEG_WAKEUP_DONE(c_seg);
lck_mtx_unlock_always(&c_seg->c_lock);
segno = c_seg->c_mysegno;
lck_mtx_lock_spin_always(c_list_lock);
c_segments[segno].c_segno = c_free_segno_head;
c_free_segno_head = segno;
c_segment_count--;
lck_mtx_unlock_always(c_list_lock);
lck_mtx_destroy(&c_seg->c_lock, &vm_compressor_lck_grp);
if (c_seg->c_slot_var_array_len) {
kheap_free(KHEAP_DATA_BUFFERS, c_seg->c_slot_var_array,
sizeof(struct c_slot) * c_seg->c_slot_var_array_len);
}
zfree(compressor_segment_zone, c_seg);
}
#if DEVELOPMENT || DEBUG
int c_seg_trim_page_count = 0;
#endif
void
c_seg_trim_tail(c_segment_t c_seg)
{
c_slot_t cs;
uint32_t c_size;
uint32_t c_offset;
uint32_t c_rounded_size;
uint16_t current_nextslot;
uint32_t current_populated_offset;
if (c_seg->c_bytes_used == 0) {
return;
}
current_nextslot = c_seg->c_nextslot;
current_populated_offset = c_seg->c_populated_offset;
while (c_seg->c_nextslot) {
cs = C_SEG_SLOT_FROM_INDEX(c_seg, (c_seg->c_nextslot - 1));
c_size = UNPACK_C_SIZE(cs);
if (c_size) {
if (current_nextslot != c_seg->c_nextslot) {
c_rounded_size = (c_size + C_SEG_OFFSET_ALIGNMENT_MASK) & ~C_SEG_OFFSET_ALIGNMENT_MASK;
c_offset = cs->c_offset + C_SEG_BYTES_TO_OFFSET(c_rounded_size);
c_seg->c_nextoffset = c_offset;
c_seg->c_populated_offset = (c_offset + (C_SEG_BYTES_TO_OFFSET(PAGE_SIZE) - 1)) &
~(C_SEG_BYTES_TO_OFFSET(PAGE_SIZE) - 1);
if (c_seg->c_firstemptyslot > c_seg->c_nextslot) {
c_seg->c_firstemptyslot = c_seg->c_nextslot;
}
#if DEVELOPMENT || DEBUG
c_seg_trim_page_count += ((round_page_32(C_SEG_OFFSET_TO_BYTES(current_populated_offset)) -
round_page_32(C_SEG_OFFSET_TO_BYTES(c_seg->c_populated_offset))) /
PAGE_SIZE);
#endif
}
break;
}
c_seg->c_nextslot--;
}
assert(c_seg->c_nextslot);
}
int
c_seg_minor_compaction_and_unlock(c_segment_t c_seg, boolean_t clear_busy)
{
c_slot_mapping_t slot_ptr;
uint32_t c_offset = 0;
uint32_t old_populated_offset;
uint32_t c_rounded_size;
uint32_t c_size;
uint16_t c_indx = 0;
int i;
c_slot_t c_dst;
c_slot_t c_src;
assert(c_seg->c_busy);
#if VALIDATE_C_SEGMENTS
c_seg_validate(c_seg, FALSE);
#endif
if (c_seg->c_bytes_used == 0) {
c_seg_free(c_seg);
return 1;
}
lck_mtx_unlock_always(&c_seg->c_lock);
if (c_seg->c_firstemptyslot >= c_seg->c_nextslot || C_SEG_UNUSED_BYTES(c_seg) < PAGE_SIZE) {
goto done;
}
#if DEVELOPMENT || DEBUG
C_SEG_MAKE_WRITEABLE(c_seg);
#endif
#if VALIDATE_C_SEGMENTS
c_seg->c_was_minor_compacted++;
#endif
c_indx = c_seg->c_firstemptyslot;
c_dst = C_SEG_SLOT_FROM_INDEX(c_seg, c_indx);
old_populated_offset = c_seg->c_populated_offset;
c_offset = c_dst->c_offset;
for (i = c_indx + 1; i < c_seg->c_nextslot && c_offset < c_seg->c_nextoffset; i++) {
c_src = C_SEG_SLOT_FROM_INDEX(c_seg, i);
c_size = UNPACK_C_SIZE(c_src);
if (c_size == 0) {
continue;
}
c_rounded_size = (c_size + C_SEG_OFFSET_ALIGNMENT_MASK) & ~C_SEG_OFFSET_ALIGNMENT_MASK;
memcpy(&c_seg->c_store.c_buffer[c_offset], &c_seg->c_store.c_buffer[c_src->c_offset], c_rounded_size);
cslot_copy(c_dst, c_src);
c_dst->c_offset = c_offset;
slot_ptr = C_SLOT_UNPACK_PTR(c_dst);
slot_ptr->s_cindx = c_indx;
c_offset += C_SEG_BYTES_TO_OFFSET(c_rounded_size);
PACK_C_SIZE(c_src, 0);
c_indx++;
c_dst = C_SEG_SLOT_FROM_INDEX(c_seg, c_indx);
}
c_seg->c_firstemptyslot = c_indx;
c_seg->c_nextslot = c_indx;
c_seg->c_nextoffset = c_offset;
c_seg->c_populated_offset = (c_offset + (C_SEG_BYTES_TO_OFFSET(PAGE_SIZE) - 1)) & ~(C_SEG_BYTES_TO_OFFSET(PAGE_SIZE) - 1);
c_seg->c_bytes_unused = 0;
#if VALIDATE_C_SEGMENTS
c_seg_validate(c_seg, TRUE);
#endif
if (old_populated_offset > c_seg->c_populated_offset) {
uint32_t gc_size;
int32_t *gc_ptr;
gc_size = C_SEG_OFFSET_TO_BYTES(old_populated_offset - c_seg->c_populated_offset);
gc_ptr = &c_seg->c_store.c_buffer[c_seg->c_populated_offset];
kernel_memory_depopulate(compressor_map, (vm_offset_t)gc_ptr, gc_size,
KMA_COMPRESSOR, VM_KERN_MEMORY_COMPRESSOR);
}
#if DEVELOPMENT || DEBUG
C_SEG_WRITE_PROTECT(c_seg);
#endif
done:
if (clear_busy == TRUE) {
lck_mtx_lock_spin_always(&c_seg->c_lock);
C_SEG_WAKEUP_DONE(c_seg);
lck_mtx_unlock_always(&c_seg->c_lock);
}
return 0;
}
static void
c_seg_alloc_nextslot(c_segment_t c_seg)
{
struct c_slot *old_slot_array = NULL;
struct c_slot *new_slot_array = NULL;
int newlen;
int oldlen;
if (c_seg->c_nextslot < c_seg_fixed_array_len) {
return;
}
if ((c_seg->c_nextslot - c_seg_fixed_array_len) >= c_seg->c_slot_var_array_len) {
oldlen = c_seg->c_slot_var_array_len;
old_slot_array = c_seg->c_slot_var_array;
if (oldlen == 0) {
newlen = C_SEG_SLOT_VAR_ARRAY_MIN_LEN;
} else {
newlen = oldlen * 2;
}
new_slot_array = kheap_alloc(KHEAP_DATA_BUFFERS,
sizeof(struct c_slot) * newlen, Z_WAITOK);
lck_mtx_lock_spin_always(&c_seg->c_lock);
if (old_slot_array) {
memcpy(new_slot_array, old_slot_array,
sizeof(struct c_slot) * oldlen);
}
c_seg->c_slot_var_array_len = newlen;
c_seg->c_slot_var_array = new_slot_array;
lck_mtx_unlock_always(&c_seg->c_lock);
if (old_slot_array) {
kheap_free(KHEAP_DATA_BUFFERS, old_slot_array,
sizeof(struct c_slot) * oldlen);
}
}
}
#define C_SEG_MAJOR_COMPACT_STATS_MAX (30)
struct {
uint64_t asked_permission;
uint64_t compactions;
uint64_t moved_slots;
uint64_t moved_bytes;
uint64_t wasted_space_in_swapouts;
uint64_t count_of_swapouts;
uint64_t count_of_freed_segs;
uint64_t bailed_compactions;
uint64_t bytes_freed_rate_us;
} c_seg_major_compact_stats[C_SEG_MAJOR_COMPACT_STATS_MAX];
int c_seg_major_compact_stats_now = 0;
#define C_MAJOR_COMPACTION_SIZE_APPROPRIATE ((C_SEG_BUFSIZE * 90) / 100)
boolean_t
c_seg_major_compact_ok(
c_segment_t c_seg_dst,
c_segment_t c_seg_src)
{
c_seg_major_compact_stats[c_seg_major_compact_stats_now].asked_permission++;
if (c_seg_src->c_bytes_used >= C_MAJOR_COMPACTION_SIZE_APPROPRIATE &&
c_seg_dst->c_bytes_used >= C_MAJOR_COMPACTION_SIZE_APPROPRIATE) {
return FALSE;
}
if (c_seg_dst->c_nextoffset >= C_SEG_OFF_LIMIT || c_seg_dst->c_nextslot >= C_SLOT_MAX_INDEX) {
return FALSE;
}
return TRUE;
}
boolean_t
c_seg_major_compact(
c_segment_t c_seg_dst,
c_segment_t c_seg_src)
{
c_slot_mapping_t slot_ptr;
uint32_t c_rounded_size;
uint32_t c_size;
uint16_t dst_slot;
int i;
c_slot_t c_dst;
c_slot_t c_src;
boolean_t keep_compacting = TRUE;
#if DEVELOPMENT || DEBUG
C_SEG_MAKE_WRITEABLE(c_seg_dst);
#endif
#if VALIDATE_C_SEGMENTS
c_seg_dst->c_was_major_compacted++;
c_seg_src->c_was_major_donor++;
#endif
c_seg_major_compact_stats[c_seg_major_compact_stats_now].compactions++;
dst_slot = c_seg_dst->c_nextslot;
for (i = 0; i < c_seg_src->c_nextslot; i++) {
c_src = C_SEG_SLOT_FROM_INDEX(c_seg_src, i);
c_size = UNPACK_C_SIZE(c_src);
if (c_size == 0) {
continue;
}
if (C_SEG_OFFSET_TO_BYTES(c_seg_dst->c_populated_offset - c_seg_dst->c_nextoffset) < (unsigned) c_size) {
int size_to_populate;
size_to_populate = C_SEG_BUFSIZE - C_SEG_OFFSET_TO_BYTES(c_seg_dst->c_populated_offset);
if (size_to_populate == 0) {
keep_compacting = FALSE;
break;
}
if (size_to_populate > C_SEG_MAX_POPULATE_SIZE) {
size_to_populate = C_SEG_MAX_POPULATE_SIZE;
}
kernel_memory_populate(compressor_map,
(vm_offset_t) &c_seg_dst->c_store.c_buffer[c_seg_dst->c_populated_offset],
size_to_populate,
KMA_COMPRESSOR,
VM_KERN_MEMORY_COMPRESSOR);
c_seg_dst->c_populated_offset += C_SEG_BYTES_TO_OFFSET(size_to_populate);
assert(C_SEG_OFFSET_TO_BYTES(c_seg_dst->c_populated_offset) <= C_SEG_BUFSIZE);
}
c_seg_alloc_nextslot(c_seg_dst);
c_dst = C_SEG_SLOT_FROM_INDEX(c_seg_dst, c_seg_dst->c_nextslot);
memcpy(&c_seg_dst->c_store.c_buffer[c_seg_dst->c_nextoffset], &c_seg_src->c_store.c_buffer[c_src->c_offset], c_size);
c_rounded_size = (c_size + C_SEG_OFFSET_ALIGNMENT_MASK) & ~C_SEG_OFFSET_ALIGNMENT_MASK;
c_seg_major_compact_stats[c_seg_major_compact_stats_now].moved_slots++;
c_seg_major_compact_stats[c_seg_major_compact_stats_now].moved_bytes += c_size;
cslot_copy(c_dst, c_src);
c_dst->c_offset = c_seg_dst->c_nextoffset;
if (c_seg_dst->c_firstemptyslot == c_seg_dst->c_nextslot) {
c_seg_dst->c_firstemptyslot++;
}
c_seg_dst->c_slots_used++;
c_seg_dst->c_nextslot++;
c_seg_dst->c_bytes_used += c_rounded_size;
c_seg_dst->c_nextoffset += C_SEG_BYTES_TO_OFFSET(c_rounded_size);
PACK_C_SIZE(c_src, 0);
c_seg_src->c_bytes_used -= c_rounded_size;
c_seg_src->c_bytes_unused += c_rounded_size;
c_seg_src->c_firstemptyslot = 0;
assert(c_seg_src->c_slots_used);
c_seg_src->c_slots_used--;
if (c_seg_dst->c_nextoffset >= C_SEG_OFF_LIMIT || c_seg_dst->c_nextslot >= C_SLOT_MAX_INDEX) {
keep_compacting = FALSE;
break;
}
}
#if DEVELOPMENT || DEBUG
C_SEG_WRITE_PROTECT(c_seg_dst);
#endif
if (dst_slot < c_seg_dst->c_nextslot) {
PAGE_REPLACEMENT_ALLOWED(TRUE);
while (dst_slot < c_seg_dst->c_nextslot) {
c_dst = C_SEG_SLOT_FROM_INDEX(c_seg_dst, dst_slot);
slot_ptr = C_SLOT_UNPACK_PTR(c_dst);
slot_ptr->s_cseg = c_seg_dst->c_mysegno + 1;
slot_ptr->s_cindx = dst_slot++;
}
PAGE_REPLACEMENT_ALLOWED(FALSE);
}
return keep_compacting;
}
uint64_t
vm_compressor_compute_elapsed_msecs(clock_sec_t end_sec, clock_nsec_t end_nsec, clock_sec_t start_sec, clock_nsec_t start_nsec)
{
uint64_t end_msecs;
uint64_t start_msecs;
end_msecs = (end_sec * 1000) + end_nsec / 1000000;
start_msecs = (start_sec * 1000) + start_nsec / 1000000;
return end_msecs - start_msecs;
}
uint32_t compressor_eval_period_in_msecs = 250;
uint32_t compressor_sample_min_in_msecs = 500;
uint32_t compressor_sample_max_in_msecs = 10000;
uint32_t compressor_thrashing_threshold_per_10msecs = 50;
uint32_t compressor_thrashing_min_per_10msecs = 20;
static boolean_t compressor_need_sample_reset = FALSE;
void
compute_swapout_target_age(void)
{
clock_sec_t cur_ts_sec;
clock_nsec_t cur_ts_nsec;
uint32_t min_operations_needed_in_this_sample;
uint64_t elapsed_msecs_in_eval;
uint64_t elapsed_msecs_in_sample;
boolean_t need_eval_reset = FALSE;
clock_get_system_nanotime(&cur_ts_sec, &cur_ts_nsec);
elapsed_msecs_in_sample = vm_compressor_compute_elapsed_msecs(cur_ts_sec, cur_ts_nsec, start_of_sample_period_sec, start_of_sample_period_nsec);
if (compressor_need_sample_reset ||
elapsed_msecs_in_sample >= compressor_sample_max_in_msecs) {
compressor_need_sample_reset = TRUE;
need_eval_reset = TRUE;
goto done;
}
elapsed_msecs_in_eval = vm_compressor_compute_elapsed_msecs(cur_ts_sec, cur_ts_nsec, start_of_eval_period_sec, start_of_eval_period_nsec);
if (elapsed_msecs_in_eval < compressor_eval_period_in_msecs) {
goto done;
}
need_eval_reset = TRUE;
KERNEL_DEBUG(0xe0400020 | DBG_FUNC_START, elapsed_msecs_in_eval, sample_period_compression_count, sample_period_decompression_count, 0, 0);
min_operations_needed_in_this_sample = (compressor_thrashing_min_per_10msecs * (uint32_t)elapsed_msecs_in_eval) / 10;
if ((sample_period_compression_count - last_eval_compression_count) < min_operations_needed_in_this_sample ||
(sample_period_decompression_count - last_eval_decompression_count) < min_operations_needed_in_this_sample) {
KERNEL_DEBUG(0xe0400020 | DBG_FUNC_END, sample_period_compression_count - last_eval_compression_count,
sample_period_decompression_count - last_eval_decompression_count, 0, 1, 0);
swapout_target_age = 0;
compressor_need_sample_reset = TRUE;
need_eval_reset = TRUE;
goto done;
}
last_eval_compression_count = sample_period_compression_count;
last_eval_decompression_count = sample_period_decompression_count;
if (elapsed_msecs_in_sample < compressor_sample_min_in_msecs) {
KERNEL_DEBUG(0xe0400020 | DBG_FUNC_END, swapout_target_age, 0, 0, 5, 0);
goto done;
}
if (sample_period_decompression_count > ((compressor_thrashing_threshold_per_10msecs * elapsed_msecs_in_sample) / 10)) {
uint64_t running_total;
uint64_t working_target;
uint64_t aging_target;
uint32_t oldest_age_of_csegs_sampled = 0;
uint64_t working_set_approximation = 0;
swapout_target_age = 0;
working_target = (sample_period_decompression_count / 100) * 95;
aging_target = (sample_period_decompression_count / 100) * 1;
running_total = 0;
for (oldest_age_of_csegs_sampled = 0; oldest_age_of_csegs_sampled < DECOMPRESSION_SAMPLE_MAX_AGE; oldest_age_of_csegs_sampled++) {
running_total += age_of_decompressions_during_sample_period[oldest_age_of_csegs_sampled];
working_set_approximation += oldest_age_of_csegs_sampled * age_of_decompressions_during_sample_period[oldest_age_of_csegs_sampled];
if (running_total >= working_target) {
break;
}
}
if (oldest_age_of_csegs_sampled < DECOMPRESSION_SAMPLE_MAX_AGE) {
working_set_approximation = (working_set_approximation * 1000) / elapsed_msecs_in_sample;
if (working_set_approximation < VM_PAGE_COMPRESSOR_COUNT) {
running_total = overage_decompressions_during_sample_period;
for (oldest_age_of_csegs_sampled = DECOMPRESSION_SAMPLE_MAX_AGE - 1; oldest_age_of_csegs_sampled; oldest_age_of_csegs_sampled--) {
running_total += age_of_decompressions_during_sample_period[oldest_age_of_csegs_sampled];
if (running_total >= aging_target) {
break;
}
}
swapout_target_age = (uint32_t)cur_ts_sec - oldest_age_of_csegs_sampled;
KERNEL_DEBUG(0xe0400020 | DBG_FUNC_END, swapout_target_age, working_set_approximation, VM_PAGE_COMPRESSOR_COUNT, 2, 0);
} else {
KERNEL_DEBUG(0xe0400020 | DBG_FUNC_END, working_set_approximation, VM_PAGE_COMPRESSOR_COUNT, 0, 3, 0);
}
} else {
KERNEL_DEBUG(0xe0400020 | DBG_FUNC_END, working_target, running_total, 0, 4, 0);
}
compressor_need_sample_reset = TRUE;
need_eval_reset = TRUE;
} else {
KERNEL_DEBUG(0xe0400020 | DBG_FUNC_END, sample_period_decompression_count, (compressor_thrashing_threshold_per_10msecs * elapsed_msecs_in_sample) / 10, 0, 6, 0);
}
done:
if (compressor_need_sample_reset == TRUE) {
bzero(age_of_decompressions_during_sample_period, sizeof(age_of_decompressions_during_sample_period));
overage_decompressions_during_sample_period = 0;
start_of_sample_period_sec = cur_ts_sec;
start_of_sample_period_nsec = cur_ts_nsec;
sample_period_decompression_count = 0;
sample_period_compression_count = 0;
last_eval_decompression_count = 0;
last_eval_compression_count = 0;
compressor_need_sample_reset = FALSE;
}
if (need_eval_reset == TRUE) {
start_of_eval_period_sec = cur_ts_sec;
start_of_eval_period_nsec = cur_ts_nsec;
}
}
int compaction_swapper_init_now = 0;
int compaction_swapper_running = 0;
int compaction_swapper_awakened = 0;
int compaction_swapper_abort = 0;
#if CONFIG_JETSAM
boolean_t memorystatus_kill_on_VM_compressor_thrashing(boolean_t);
boolean_t memorystatus_kill_on_VM_compressor_space_shortage(boolean_t);
boolean_t memorystatus_kill_on_FC_thrashing(boolean_t);
int compressor_thrashing_induced_jetsam = 0;
int filecache_thrashing_induced_jetsam = 0;
static boolean_t vm_compressor_thrashing_detected = FALSE;
#endif
static boolean_t
compressor_needs_to_swap(void)
{
boolean_t should_swap = FALSE;
if (vm_swapout_ripe_segments == TRUE && c_overage_swapped_count < c_overage_swapped_limit) {
c_segment_t c_seg;
clock_sec_t now;
clock_sec_t age;
clock_nsec_t nsec;
clock_get_system_nanotime(&now, &nsec);
age = 0;
lck_mtx_lock_spin_always(c_list_lock);
if (!queue_empty(&c_age_list_head)) {
c_seg = (c_segment_t) queue_first(&c_age_list_head);
age = now - c_seg->c_creation_ts;
}
lck_mtx_unlock_always(c_list_lock);
if (age >= vm_ripe_target_age) {
should_swap = TRUE;
goto check_if_low_space;
}
}
if (VM_CONFIG_SWAP_IS_ACTIVE) {
if (COMPRESSOR_NEEDS_TO_SWAP()) {
should_swap = TRUE;
goto check_if_low_space;
}
if (VM_PAGE_Q_THROTTLED(&vm_pageout_queue_external) && vm_page_anonymous_count < (vm_page_inactive_count / 20)) {
should_swap = TRUE;
goto check_if_low_space;
}
if (vm_page_free_count < (vm_page_free_reserved - (COMPRESSOR_FREE_RESERVED_LIMIT * 2))) {
should_swap = TRUE;
goto check_if_low_space;
}
}
#if (XNU_TARGET_OS_OSX && __arm64__)
#else
compute_swapout_target_age();
if (swapout_target_age) {
c_segment_t c_seg;
lck_mtx_lock_spin_always(c_list_lock);
if (!queue_empty(&c_age_list_head)) {
c_seg = (c_segment_t) queue_first(&c_age_list_head);
if (c_seg->c_creation_ts > swapout_target_age) {
swapout_target_age = 0;
}
}
lck_mtx_unlock_always(c_list_lock);
}
#if CONFIG_PHANTOM_CACHE
if (vm_phantom_cache_check_pressure()) {
should_swap = TRUE;
}
#endif
if (swapout_target_age) {
should_swap = TRUE;
}
#endif
check_if_low_space:
#if CONFIG_JETSAM
if (should_swap || vm_compressor_low_on_space() == TRUE) {
if (vm_compressor_thrashing_detected == FALSE) {
vm_compressor_thrashing_detected = TRUE;
if (swapout_target_age) {
memorystatus_kill_on_VM_compressor_thrashing(TRUE );
compressor_thrashing_induced_jetsam++;
} else if (vm_compressor_low_on_space() == TRUE) {
memorystatus_kill_on_VM_compressor_space_shortage(TRUE );
compressor_thrashing_induced_jetsam++;
} else {
memorystatus_kill_on_FC_thrashing(TRUE );
filecache_thrashing_induced_jetsam++;
}
}
should_swap = FALSE;
}
#else
if (should_swap && vm_swap_low_on_space()) {
vm_compressor_take_paging_space_action();
}
#endif
if (should_swap == FALSE) {
should_swap = vm_compressor_needs_to_major_compact();
}
return should_swap;
}
#if CONFIG_JETSAM
void
vm_thrashing_jetsam_done(void)
{
vm_compressor_thrashing_detected = FALSE;
if (swapout_target_age) {
swapout_target_age = 0;
compressor_need_sample_reset = TRUE;
}
#if CONFIG_PHANTOM_CACHE
else {
vm_phantom_cache_restart_sample();
}
#endif
}
#endif
uint32_t vm_wake_compactor_swapper_calls = 0;
uint32_t vm_run_compactor_already_running = 0;
uint32_t vm_run_compactor_empty_minor_q = 0;
uint32_t vm_run_compactor_did_compact = 0;
uint32_t vm_run_compactor_waited = 0;
void
vm_run_compactor(void)
{
if (c_segment_count == 0) {
return;
}
lck_mtx_lock_spin_always(c_list_lock);
if (c_minor_count == 0) {
vm_run_compactor_empty_minor_q++;
lck_mtx_unlock_always(c_list_lock);
return;
}
if (compaction_swapper_running) {
if (vm_pageout_state.vm_restricted_to_single_processor == FALSE) {
vm_run_compactor_already_running++;
lck_mtx_unlock_always(c_list_lock);
return;
}
vm_run_compactor_waited++;
assert_wait((event_t)&compaction_swapper_running, THREAD_UNINT);
lck_mtx_unlock_always(c_list_lock);
thread_block(THREAD_CONTINUE_NULL);
return;
}
vm_run_compactor_did_compact++;
fastwake_warmup = FALSE;
compaction_swapper_running = 1;
vm_compressor_do_delayed_compactions(FALSE);
compaction_swapper_running = 0;
lck_mtx_unlock_always(c_list_lock);
thread_wakeup((event_t)&compaction_swapper_running);
}
void
vm_wake_compactor_swapper(void)
{
if (compaction_swapper_running || compaction_swapper_awakened || c_segment_count == 0) {
return;
}
if (c_minor_count || vm_compressor_needs_to_major_compact()) {
lck_mtx_lock_spin_always(c_list_lock);
fastwake_warmup = FALSE;
if (compaction_swapper_running == 0 && compaction_swapper_awakened == 0) {
vm_wake_compactor_swapper_calls++;
compaction_swapper_awakened = 1;
thread_wakeup((event_t)&c_compressor_swap_trigger);
}
lck_mtx_unlock_always(c_list_lock);
}
}
void
vm_consider_swapping()
{
c_segment_t c_seg, c_seg_next;
clock_sec_t now;
clock_nsec_t nsec;
assert(VM_CONFIG_SWAP_IS_PRESENT);
lck_mtx_lock_spin_always(c_list_lock);
compaction_swapper_abort = 1;
while (compaction_swapper_running) {
assert_wait((event_t)&compaction_swapper_running, THREAD_UNINT);
lck_mtx_unlock_always(c_list_lock);
thread_block(THREAD_CONTINUE_NULL);
lck_mtx_lock_spin_always(c_list_lock);
}
compaction_swapper_abort = 0;
compaction_swapper_running = 1;
vm_swapout_ripe_segments = TRUE;
if (!queue_empty(&c_major_list_head)) {
clock_get_system_nanotime(&now, &nsec);
c_seg = (c_segment_t)queue_first(&c_major_list_head);
while (!queue_end(&c_major_list_head, (queue_entry_t)c_seg)) {
if (c_overage_swapped_count >= c_overage_swapped_limit) {
break;
}
c_seg_next = (c_segment_t) queue_next(&c_seg->c_age_list);
if ((now - c_seg->c_creation_ts) >= vm_ripe_target_age) {
lck_mtx_lock_spin_always(&c_seg->c_lock);
c_seg_switch_state(c_seg, C_ON_AGE_Q, FALSE);
lck_mtx_unlock_always(&c_seg->c_lock);
}
c_seg = c_seg_next;
}
}
vm_compressor_compact_and_swap(FALSE);
compaction_swapper_running = 0;
vm_swapout_ripe_segments = FALSE;
lck_mtx_unlock_always(c_list_lock);
thread_wakeup((event_t)&compaction_swapper_running);
}
void
vm_consider_waking_compactor_swapper(void)
{
boolean_t need_wakeup = FALSE;
if (c_segment_count == 0) {
return;
}
if (compaction_swapper_running || compaction_swapper_awakened) {
return;
}
if (!compaction_swapper_inited && !compaction_swapper_init_now) {
compaction_swapper_init_now = 1;
need_wakeup = TRUE;
}
if (c_minor_count && (COMPRESSOR_NEEDS_TO_MINOR_COMPACT())) {
need_wakeup = TRUE;
} else if (compressor_needs_to_swap()) {
need_wakeup = TRUE;
} else if (c_minor_count) {
uint64_t total_bytes;
total_bytes = compressor_object->resident_page_count * PAGE_SIZE_64;
if ((total_bytes - compressor_bytes_used) > total_bytes / 10) {
need_wakeup = TRUE;
}
}
if (need_wakeup == TRUE) {
lck_mtx_lock_spin_always(c_list_lock);
fastwake_warmup = FALSE;
if (compaction_swapper_running == 0 && compaction_swapper_awakened == 0) {
memoryshot(VM_WAKEUP_COMPACTOR_SWAPPER, DBG_FUNC_NONE);
compaction_swapper_awakened = 1;
thread_wakeup((event_t)&c_compressor_swap_trigger);
}
lck_mtx_unlock_always(c_list_lock);
}
}
#define C_SWAPOUT_LIMIT 4
#define DELAYED_COMPACTIONS_PER_PASS 30
void
vm_compressor_do_delayed_compactions(boolean_t flush_all)
{
c_segment_t c_seg;
int number_compacted = 0;
boolean_t needs_to_swap = FALSE;
VM_DEBUG_CONSTANT_EVENT(vm_compressor_do_delayed_compactions, VM_COMPRESSOR_DO_DELAYED_COMPACTIONS, DBG_FUNC_START, c_minor_count, flush_all, 0, 0);
#if XNU_TARGET_OS_OSX
LCK_MTX_ASSERT(c_list_lock, LCK_MTX_ASSERT_OWNED);
#endif
while (!queue_empty(&c_minor_list_head) && needs_to_swap == FALSE) {
c_seg = (c_segment_t)queue_first(&c_minor_list_head);
lck_mtx_lock_spin_always(&c_seg->c_lock);
if (c_seg->c_busy) {
lck_mtx_unlock_always(c_list_lock);
c_seg_wait_on_busy(c_seg);
lck_mtx_lock_spin_always(c_list_lock);
continue;
}
C_SEG_BUSY(c_seg);
c_seg_do_minor_compaction_and_unlock(c_seg, TRUE, FALSE, TRUE);
if (VM_CONFIG_SWAP_IS_ACTIVE && (number_compacted++ > DELAYED_COMPACTIONS_PER_PASS)) {
if ((flush_all == TRUE || compressor_needs_to_swap() == TRUE) && c_swapout_count < C_SWAPOUT_LIMIT) {
needs_to_swap = TRUE;
}
number_compacted = 0;
}
lck_mtx_lock_spin_always(c_list_lock);
}
VM_DEBUG_CONSTANT_EVENT(vm_compressor_do_delayed_compactions, VM_COMPRESSOR_DO_DELAYED_COMPACTIONS, DBG_FUNC_END, c_minor_count, number_compacted, needs_to_swap, 0);
}
#define C_SEGMENT_SWAPPEDIN_AGE_LIMIT 10
static void
vm_compressor_age_swapped_in_segments(boolean_t flush_all)
{
c_segment_t c_seg;
clock_sec_t now;
clock_nsec_t nsec;
clock_get_system_nanotime(&now, &nsec);
while (!queue_empty(&c_swappedin_list_head)) {
c_seg = (c_segment_t)queue_first(&c_swappedin_list_head);
if (flush_all == FALSE && (now - c_seg->c_swappedin_ts) < C_SEGMENT_SWAPPEDIN_AGE_LIMIT) {
break;
}
lck_mtx_lock_spin_always(&c_seg->c_lock);
c_seg_switch_state(c_seg, C_ON_AGE_Q, FALSE);
lck_mtx_unlock_always(&c_seg->c_lock);
}
}
extern int vm_num_swap_files;
extern int vm_num_pinned_swap_files;
extern int vm_swappin_enabled;
extern unsigned int vm_swapfile_total_segs_used;
extern unsigned int vm_swapfile_total_segs_alloced;
void
vm_compressor_flush(void)
{
uint64_t vm_swap_put_failures_at_start;
wait_result_t wait_result = 0;
AbsoluteTime startTime, endTime;
clock_sec_t now_sec;
clock_nsec_t now_nsec;
uint64_t nsec;
HIBLOG("vm_compressor_flush - starting\n");
clock_get_uptime(&startTime);
lck_mtx_lock_spin_always(c_list_lock);
fastwake_warmup = FALSE;
compaction_swapper_abort = 1;
while (compaction_swapper_running) {
assert_wait((event_t)&compaction_swapper_running, THREAD_UNINT);
lck_mtx_unlock_always(c_list_lock);
thread_block(THREAD_CONTINUE_NULL);
lck_mtx_lock_spin_always(c_list_lock);
}
compaction_swapper_abort = 0;
compaction_swapper_running = 1;
hibernate_flushing = TRUE;
hibernate_no_swapspace = FALSE;
c_generation_id_flush_barrier = c_generation_id + 1000;
clock_get_system_nanotime(&now_sec, &now_nsec);
hibernate_flushing_deadline = now_sec + HIBERNATE_FLUSHING_SECS_TO_COMPLETE;
vm_swap_put_failures_at_start = vm_swap_put_failures;
vm_compressor_compact_and_swap(TRUE);
while (!queue_empty(&c_swapout_list_head)) {
assert_wait_timeout((event_t) &compaction_swapper_running, THREAD_INTERRUPTIBLE, 5000, 1000 * NSEC_PER_USEC);
lck_mtx_unlock_always(c_list_lock);
wait_result = thread_block(THREAD_CONTINUE_NULL);
lck_mtx_lock_spin_always(c_list_lock);
if (wait_result == THREAD_TIMED_OUT) {
break;
}
}
hibernate_flushing = FALSE;
compaction_swapper_running = 0;
if (vm_swap_put_failures > vm_swap_put_failures_at_start) {
HIBLOG("vm_compressor_flush failed to clean %llu segments - vm_page_compressor_count(%d)\n",
vm_swap_put_failures - vm_swap_put_failures_at_start, VM_PAGE_COMPRESSOR_COUNT);
}
lck_mtx_unlock_always(c_list_lock);
thread_wakeup((event_t)&compaction_swapper_running);
clock_get_uptime(&endTime);
SUB_ABSOLUTETIME(&endTime, &startTime);
absolutetime_to_nanoseconds(endTime, &nsec);
HIBLOG("vm_compressor_flush completed - took %qd msecs - vm_num_swap_files = %d, vm_num_pinned_swap_files = %d, vm_swappin_enabled = %d\n",
nsec / 1000000ULL, vm_num_swap_files, vm_num_pinned_swap_files, vm_swappin_enabled);
}
int compaction_swap_trigger_thread_awakened = 0;
static void
vm_compressor_swap_trigger_thread(void)
{
current_thread()->options |= TH_OPT_VMPRIV;
if (compaction_swapper_init_now) {
vm_compaction_swapper_do_init();
if (vm_pageout_state.vm_restricted_to_single_processor == TRUE) {
thread_vm_bind_group_add();
}
#if CONFIG_THREAD_GROUPS
thread_group_vm_add();
#endif
thread_set_thread_name(current_thread(), "VM_cswap_trigger");
compaction_swapper_init_now = 0;
}
lck_mtx_lock_spin_always(c_list_lock);
compaction_swap_trigger_thread_awakened++;
compaction_swapper_awakened = 0;
if (compaction_swapper_running == 0) {
compaction_swapper_running = 1;
vm_compressor_compact_and_swap(FALSE);
compaction_swapper_running = 0;
}
assert_wait((event_t)&c_compressor_swap_trigger, THREAD_UNINT);
if (compaction_swapper_running == 0) {
thread_wakeup((event_t)&compaction_swapper_running);
}
lck_mtx_unlock_always(c_list_lock);
thread_block((thread_continue_t)vm_compressor_swap_trigger_thread);
}
void
vm_compressor_record_warmup_start(void)
{
c_segment_t c_seg;
lck_mtx_lock_spin_always(c_list_lock);
if (first_c_segment_to_warm_generation_id == 0) {
if (!queue_empty(&c_age_list_head)) {
c_seg = (c_segment_t)queue_last(&c_age_list_head);
first_c_segment_to_warm_generation_id = c_seg->c_generation_id;
} else {
first_c_segment_to_warm_generation_id = 0;
}
fastwake_recording_in_progress = TRUE;
}
lck_mtx_unlock_always(c_list_lock);
}
void
vm_compressor_record_warmup_end(void)
{
c_segment_t c_seg;
lck_mtx_lock_spin_always(c_list_lock);
if (fastwake_recording_in_progress == TRUE) {
if (!queue_empty(&c_age_list_head)) {
c_seg = (c_segment_t)queue_last(&c_age_list_head);
last_c_segment_to_warm_generation_id = c_seg->c_generation_id;
} else {
last_c_segment_to_warm_generation_id = first_c_segment_to_warm_generation_id;
}
fastwake_recording_in_progress = FALSE;
HIBLOG("vm_compressor_record_warmup (%qd - %qd)\n", first_c_segment_to_warm_generation_id, last_c_segment_to_warm_generation_id);
}
lck_mtx_unlock_always(c_list_lock);
}
#define DELAY_TRIM_ON_WAKE_SECS 25
void
vm_compressor_delay_trim(void)
{
clock_sec_t sec;
clock_nsec_t nsec;
clock_get_system_nanotime(&sec, &nsec);
dont_trim_until_ts = sec + DELAY_TRIM_ON_WAKE_SECS;
}
void
vm_compressor_do_warmup(void)
{
lck_mtx_lock_spin_always(c_list_lock);
if (first_c_segment_to_warm_generation_id == last_c_segment_to_warm_generation_id) {
first_c_segment_to_warm_generation_id = last_c_segment_to_warm_generation_id = 0;
lck_mtx_unlock_always(c_list_lock);
return;
}
if (compaction_swapper_running == 0 && compaction_swapper_awakened == 0) {
fastwake_warmup = TRUE;
compaction_swapper_awakened = 1;
thread_wakeup((event_t)&c_compressor_swap_trigger);
}
lck_mtx_unlock_always(c_list_lock);
}
void
do_fastwake_warmup_all(void)
{
lck_mtx_lock_spin_always(c_list_lock);
if (queue_empty(&c_swappedout_list_head) && queue_empty(&c_swappedout_sparse_list_head)) {
lck_mtx_unlock_always(c_list_lock);
return;
}
fastwake_warmup = TRUE;
do_fastwake_warmup(&c_swappedout_list_head, TRUE);
do_fastwake_warmup(&c_swappedout_sparse_list_head, TRUE);
fastwake_warmup = FALSE;
lck_mtx_unlock_always(c_list_lock);
}
void
do_fastwake_warmup(queue_head_t *c_queue, boolean_t consider_all_cseg)
{
c_segment_t c_seg = NULL;
AbsoluteTime startTime, endTime;
uint64_t nsec;
HIBLOG("vm_compressor_fastwake_warmup (%qd - %qd) - starting\n", first_c_segment_to_warm_generation_id, last_c_segment_to_warm_generation_id);
clock_get_uptime(&startTime);
lck_mtx_unlock_always(c_list_lock);
proc_set_thread_policy(current_thread(),
TASK_POLICY_INTERNAL, TASK_POLICY_IO, THROTTLE_LEVEL_COMPRESSOR_TIER2);
PAGE_REPLACEMENT_DISALLOWED(TRUE);
lck_mtx_lock_spin_always(c_list_lock);
while (!queue_empty(c_queue) && fastwake_warmup == TRUE) {
c_seg = (c_segment_t) queue_first(c_queue);
if (consider_all_cseg == FALSE) {
if (c_seg->c_generation_id < first_c_segment_to_warm_generation_id ||
c_seg->c_generation_id > last_c_segment_to_warm_generation_id) {
break;
}
if (vm_page_free_count < (AVAILABLE_MEMORY / 4)) {
break;
}
}
lck_mtx_lock_spin_always(&c_seg->c_lock);
lck_mtx_unlock_always(c_list_lock);
if (c_seg->c_busy) {
PAGE_REPLACEMENT_DISALLOWED(FALSE);
c_seg_wait_on_busy(c_seg);
PAGE_REPLACEMENT_DISALLOWED(TRUE);
} else {
if (c_seg_swapin(c_seg, TRUE, FALSE) == 0) {
lck_mtx_unlock_always(&c_seg->c_lock);
}
c_segment_warmup_count++;
PAGE_REPLACEMENT_DISALLOWED(FALSE);
vm_pageout_io_throttle();
PAGE_REPLACEMENT_DISALLOWED(TRUE);
}
lck_mtx_lock_spin_always(c_list_lock);
}
lck_mtx_unlock_always(c_list_lock);
PAGE_REPLACEMENT_DISALLOWED(FALSE);
proc_set_thread_policy(current_thread(),
TASK_POLICY_INTERNAL, TASK_POLICY_IO, THROTTLE_LEVEL_COMPRESSOR_TIER0);
clock_get_uptime(&endTime);
SUB_ABSOLUTETIME(&endTime, &startTime);
absolutetime_to_nanoseconds(endTime, &nsec);
HIBLOG("vm_compressor_fastwake_warmup completed - took %qd msecs\n", nsec / 1000000ULL);
lck_mtx_lock_spin_always(c_list_lock);
if (consider_all_cseg == FALSE) {
first_c_segment_to_warm_generation_id = last_c_segment_to_warm_generation_id = 0;
}
}
int min_csegs_per_major_compaction = DELAYED_COMPACTIONS_PER_PASS;
extern bool vm_swapout_thread_running;
extern boolean_t compressor_store_stop_compaction;
void
vm_compressor_compact_and_swap(boolean_t flush_all)
{
c_segment_t c_seg, c_seg_next;
boolean_t keep_compacting, switch_state;
clock_sec_t now;
clock_nsec_t nsec;
mach_timespec_t start_ts, end_ts;
unsigned int number_considered, wanted_cseg_found, yield_after_considered_per_pass, number_yields;
uint64_t bytes_to_free, bytes_freed, delta_usec;
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_START, c_age_count, c_minor_count, c_major_count, vm_page_free_count);
if (fastwake_warmup == TRUE) {
uint64_t starting_warmup_count;
starting_warmup_count = c_segment_warmup_count;
KERNEL_DEBUG_CONSTANT(IOKDBG_CODE(DBG_HIBERNATE, 11) | DBG_FUNC_START, c_segment_warmup_count,
first_c_segment_to_warm_generation_id, last_c_segment_to_warm_generation_id, 0, 0);
do_fastwake_warmup(&c_swappedout_list_head, FALSE);
KERNEL_DEBUG_CONSTANT(IOKDBG_CODE(DBG_HIBERNATE, 11) | DBG_FUNC_END, c_segment_warmup_count, c_segment_warmup_count - starting_warmup_count, 0, 0, 0);
fastwake_warmup = FALSE;
}
vm_compressor_do_delayed_compactions(flush_all);
vm_compressor_age_swapped_in_segments(flush_all);
clock_get_system_nanotime(&now, &nsec);
start_ts.tv_sec = (int) now;
start_ts.tv_nsec = nsec;
delta_usec = 0;
number_considered = 0;
wanted_cseg_found = 0;
number_yields = 0;
bytes_to_free = 0;
bytes_freed = 0;
yield_after_considered_per_pass = MAX(min_csegs_per_major_compaction, DELAYED_COMPACTIONS_PER_PASS);
while (!queue_empty(&c_age_list_head) && !compaction_swapper_abort && !compressor_store_stop_compaction) {
if (hibernate_flushing == TRUE) {
clock_sec_t sec;
if (hibernate_should_abort()) {
HIBLOG("vm_compressor_flush - hibernate_should_abort returned TRUE\n");
break;
}
if (hibernate_no_swapspace == TRUE) {
HIBLOG("vm_compressor_flush - out of swap space\n");
break;
}
if (vm_swap_files_pinned() == FALSE) {
HIBLOG("vm_compressor_flush - unpinned swap files\n");
break;
}
if (hibernate_in_progress_with_pinned_swap == TRUE &&
(vm_swapfile_total_segs_alloced == vm_swapfile_total_segs_used)) {
HIBLOG("vm_compressor_flush - out of pinned swap space\n");
break;
}
clock_get_system_nanotime(&sec, &nsec);
if (sec > hibernate_flushing_deadline) {
HIBLOG("vm_compressor_flush - failed to finish before deadline\n");
break;
}
}
if (!vm_swap_out_of_space() && c_swapout_count >= C_SWAPOUT_LIMIT) {
assert_wait_timeout((event_t) &compaction_swapper_running, THREAD_INTERRUPTIBLE, 100, 1000 * NSEC_PER_USEC);
if (!vm_swapout_thread_running) {
thread_wakeup((event_t)&c_swapout_list_head);
}
lck_mtx_unlock_always(c_list_lock);
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_NONE, 1, c_swapout_count, 0, 0);
thread_block(THREAD_CONTINUE_NULL);
lck_mtx_lock_spin_always(c_list_lock);
}
vm_compressor_do_delayed_compactions(flush_all);
vm_compressor_age_swapped_in_segments(flush_all);
if (!vm_swap_out_of_space() && c_swapout_count >= C_SWAPOUT_LIMIT) {
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_NONE, 2, c_swapout_count, 0, 0);
continue;
}
if (flush_all == FALSE) {
boolean_t needs_to_swap;
lck_mtx_unlock_always(c_list_lock);
needs_to_swap = compressor_needs_to_swap();
lck_mtx_lock_spin_always(c_list_lock);
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_NONE, 3, needs_to_swap, 0, 0);
if (needs_to_swap == FALSE) {
break;
}
}
if (queue_empty(&c_age_list_head)) {
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_NONE, 4, c_age_count, 0, 0);
break;
}
c_seg = (c_segment_t) queue_first(&c_age_list_head);
assert(c_seg->c_state == C_ON_AGE_Q);
if (flush_all == TRUE && c_seg->c_generation_id > c_generation_id_flush_barrier) {
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_NONE, 5, 0, 0, 0);
break;
}
lck_mtx_lock_spin_always(&c_seg->c_lock);
if (c_seg->c_busy) {
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_NONE, 6, (void*) VM_KERNEL_ADDRPERM(c_seg), 0, 0);
lck_mtx_unlock_always(c_list_lock);
c_seg_wait_on_busy(c_seg);
lck_mtx_lock_spin_always(c_list_lock);
continue;
}
C_SEG_BUSY(c_seg);
if (c_seg_do_minor_compaction_and_unlock(c_seg, FALSE, TRUE, TRUE)) {
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_NONE, 7, 0, 0, 0);
c_seg_major_compact_stats[c_seg_major_compact_stats_now].count_of_freed_segs++;
continue;
}
keep_compacting = TRUE;
switch_state = TRUE;
while (keep_compacting == TRUE) {
assert(c_seg->c_busy);
c_seg_next = (c_segment_t) queue_next(&c_seg->c_age_list);
if (queue_end(&c_age_list_head, (queue_entry_t)c_seg_next)) {
break;
}
assert(c_seg_next->c_state == C_ON_AGE_Q);
number_considered++;
if (c_seg_major_compact_ok(c_seg, c_seg_next) == FALSE) {
break;
}
lck_mtx_lock_spin_always(&c_seg_next->c_lock);
if (c_seg_next->c_busy) {
if (c_seg->c_wanted) {
lck_mtx_unlock_always(&c_seg_next->c_lock);
switch_state = FALSE;
c_seg_major_compact_stats[c_seg_major_compact_stats_now].bailed_compactions++;
wanted_cseg_found++;
break;
}
lck_mtx_unlock_always(c_list_lock);
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_NONE, 8, (void*) VM_KERNEL_ADDRPERM(c_seg_next), 0, 0);
c_seg_wait_on_busy(c_seg_next);
lck_mtx_lock_spin_always(c_list_lock);
continue;
}
C_SEG_BUSY(c_seg_next);
bytes_to_free = C_SEG_OFFSET_TO_BYTES(c_seg_next->c_populated_offset);
if (c_seg_do_minor_compaction_and_unlock(c_seg_next, FALSE, TRUE, TRUE)) {
bytes_freed += bytes_to_free;
c_seg_major_compact_stats[c_seg_major_compact_stats_now].count_of_freed_segs++;
continue;
}
lck_mtx_unlock_always(c_list_lock);
keep_compacting = c_seg_major_compact(c_seg, c_seg_next);
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_NONE, 9, keep_compacting, 0, 0);
PAGE_REPLACEMENT_DISALLOWED(TRUE);
lck_mtx_lock_spin_always(&c_seg_next->c_lock);
bytes_to_free = C_SEG_OFFSET_TO_BYTES(c_seg_next->c_populated_offset);
if (c_seg_minor_compaction_and_unlock(c_seg_next, TRUE)) {
bytes_freed += bytes_to_free;
c_seg_major_compact_stats[c_seg_major_compact_stats_now].count_of_freed_segs++;
} else {
bytes_to_free -= C_SEG_OFFSET_TO_BYTES(c_seg_next->c_populated_offset);
bytes_freed += bytes_to_free;
}
PAGE_REPLACEMENT_DISALLOWED(FALSE);
lck_mtx_lock_spin_always(c_list_lock);
if (c_seg->c_wanted) {
switch_state = FALSE;
wanted_cseg_found++;
c_seg_major_compact_stats[c_seg_major_compact_stats_now].bailed_compactions++;
break;
}
}
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_NONE, 10, number_considered, wanted_cseg_found, 0);
lck_mtx_lock_spin_always(&c_seg->c_lock);
assert(c_seg->c_busy);
assert(!c_seg->c_on_minorcompact_q);
if (switch_state) {
if (VM_CONFIG_SWAP_IS_ACTIVE) {
c_seg_switch_state(c_seg, C_ON_SWAPOUT_Q, FALSE);
} else {
if ((vm_swapout_ripe_segments == TRUE && c_overage_swapped_count < c_overage_swapped_limit)) {
assert(VM_CONFIG_SWAP_IS_PRESENT);
if ((now - c_seg->c_creation_ts) >= vm_ripe_target_age) {
c_seg->c_overage_swap = TRUE;
c_overage_swapped_count++;
c_seg_switch_state(c_seg, C_ON_SWAPOUT_Q, FALSE);
}
}
}
if (c_seg->c_state == C_ON_AGE_Q) {
c_seg_switch_state(c_seg, C_ON_MAJORCOMPACT_Q, FALSE);
} else {
c_seg_major_compact_stats[c_seg_major_compact_stats_now].wasted_space_in_swapouts += C_SEG_BUFSIZE - c_seg->c_bytes_used;
c_seg_major_compact_stats[c_seg_major_compact_stats_now].count_of_swapouts++;
}
}
C_SEG_WAKEUP_DONE(c_seg);
lck_mtx_unlock_always(&c_seg->c_lock);
if (c_swapout_count) {
if (!vm_swapout_thread_running) {
thread_wakeup((event_t)&c_swapout_list_head);
}
}
if (number_considered >= yield_after_considered_per_pass) {
if (wanted_cseg_found) {
lck_mtx_unlock_always(c_list_lock);
mutex_pause(2);
number_yields++;
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_NONE, 11, number_considered, number_yields, 0);
lck_mtx_lock_spin_always(c_list_lock);
}
number_considered = 0;
wanted_cseg_found = 0;
}
}
clock_get_system_nanotime(&now, &nsec);
end_ts.tv_sec = (int) now;
end_ts.tv_nsec = nsec;
SUB_MACH_TIMESPEC(&end_ts, &start_ts);
delta_usec = (end_ts.tv_sec * USEC_PER_SEC) + (end_ts.tv_nsec / NSEC_PER_USEC) - (number_yields * 100);
delta_usec = MAX(1, delta_usec);
c_seg_major_compact_stats[c_seg_major_compact_stats_now].bytes_freed_rate_us = (bytes_freed / delta_usec);
if ((c_seg_major_compact_stats_now + 1) == C_SEG_MAJOR_COMPACT_STATS_MAX) {
c_seg_major_compact_stats_now = 0;
} else {
c_seg_major_compact_stats_now++;
}
assert(c_seg_major_compact_stats_now < C_SEG_MAJOR_COMPACT_STATS_MAX);
VM_DEBUG_CONSTANT_EVENT(vm_compressor_compact_and_swap, VM_COMPRESSOR_COMPACT_AND_SWAP, DBG_FUNC_END, c_age_count, c_minor_count, c_major_count, vm_page_free_count);
}
static c_segment_t
c_seg_allocate(c_segment_t *current_chead)
{
c_segment_t c_seg;
int min_needed;
int size_to_populate;
#if XNU_TARGET_OS_OSX
if (vm_compressor_low_on_space()) {
vm_compressor_take_paging_space_action();
}
#endif
if ((c_seg = *current_chead) == NULL) {
uint32_t c_segno;
lck_mtx_lock_spin_always(c_list_lock);
while (c_segments_busy == TRUE) {
assert_wait((event_t) (&c_segments_busy), THREAD_UNINT);
lck_mtx_unlock_always(c_list_lock);
thread_block(THREAD_CONTINUE_NULL);
lck_mtx_lock_spin_always(c_list_lock);
}
if (c_free_segno_head == (uint32_t)-1) {
uint32_t c_segments_available_new;
uint32_t compressed_pages;
#if CONFIG_FREEZE
if (freezer_incore_cseg_acct) {
compressed_pages = c_segment_pages_compressed_incore;
} else {
compressed_pages = c_segment_pages_compressed;
}
#else
compressed_pages = c_segment_pages_compressed;
#endif
if (c_segments_available >= c_segments_limit || compressed_pages >= c_segment_pages_compressed_limit) {
lck_mtx_unlock_always(c_list_lock);
return NULL;
}
c_segments_busy = TRUE;
lck_mtx_unlock_always(c_list_lock);
kernel_memory_populate(compressor_map, (vm_offset_t)c_segments_next_page,
PAGE_SIZE, KMA_KOBJECT, VM_KERN_MEMORY_COMPRESSOR);
c_segments_next_page += PAGE_SIZE;
c_segments_available_new = c_segments_available + C_SEGMENTS_PER_PAGE;
if (c_segments_available_new > c_segments_limit) {
c_segments_available_new = c_segments_limit;
}
for (c_segno = c_segments_available + 1; c_segno < c_segments_available_new; c_segno++) {
c_segments[c_segno - 1].c_segno = c_segno;
}
lck_mtx_lock_spin_always(c_list_lock);
c_segments[c_segno - 1].c_segno = c_free_segno_head;
c_free_segno_head = c_segments_available;
c_segments_available = c_segments_available_new;
c_segments_busy = FALSE;
thread_wakeup((event_t) (&c_segments_busy));
}
c_segno = c_free_segno_head;
assert(c_segno >= 0 && c_segno < c_segments_limit);
c_free_segno_head = (uint32_t)c_segments[c_segno].c_segno;
c_segment_count++;
if (c_segment_count > c_segment_count_max) {
c_segment_count_max = c_segment_count;
}
lck_mtx_unlock_always(c_list_lock);
c_seg = zalloc_flags(compressor_segment_zone, Z_WAITOK | Z_ZERO);
c_seg->c_store.c_buffer = (int32_t *)C_SEG_BUFFER_ADDRESS(c_segno);
lck_mtx_init(&c_seg->c_lock, &vm_compressor_lck_grp, LCK_ATTR_NULL);
c_seg->c_state = C_IS_EMPTY;
c_seg->c_firstemptyslot = C_SLOT_MAX_INDEX;
c_seg->c_mysegno = c_segno;
lck_mtx_lock_spin_always(c_list_lock);
c_empty_count++;
c_seg_switch_state(c_seg, C_IS_FILLING, FALSE);
c_segments[c_segno].c_seg = c_seg;
assert(c_segments[c_segno].c_segno > c_segments_available);
lck_mtx_unlock_always(c_list_lock);
*current_chead = c_seg;
#if DEVELOPMENT || DEBUG
C_SEG_MAKE_WRITEABLE(c_seg);
#endif
}
c_seg_alloc_nextslot(c_seg);
size_to_populate = C_SEG_ALLOCSIZE - C_SEG_OFFSET_TO_BYTES(c_seg->c_populated_offset);
if (size_to_populate) {
min_needed = PAGE_SIZE + (C_SEG_ALLOCSIZE - C_SEG_BUFSIZE);
if (C_SEG_OFFSET_TO_BYTES(c_seg->c_populated_offset - c_seg->c_nextoffset) < (unsigned) min_needed) {
if (size_to_populate > C_SEG_MAX_POPULATE_SIZE) {
size_to_populate = C_SEG_MAX_POPULATE_SIZE;
}
OSAddAtomic64(size_to_populate / PAGE_SIZE, &vm_pageout_vminfo.vm_compressor_pages_grabbed);
kernel_memory_populate(compressor_map,
(vm_offset_t) &c_seg->c_store.c_buffer[c_seg->c_populated_offset],
size_to_populate,
KMA_COMPRESSOR,
VM_KERN_MEMORY_COMPRESSOR);
} else {
size_to_populate = 0;
}
}
PAGE_REPLACEMENT_DISALLOWED(TRUE);
lck_mtx_lock_spin_always(&c_seg->c_lock);
if (size_to_populate) {
c_seg->c_populated_offset += C_SEG_BYTES_TO_OFFSET(size_to_populate);
}
return c_seg;
}
#if DEVELOPMENT || DEBUG
#if CONFIG_FREEZE
extern boolean_t memorystatus_freeze_to_memory;
#endif
#endif
static void
c_current_seg_filled(c_segment_t c_seg, c_segment_t *current_chead)
{
uint32_t unused_bytes;
uint32_t offset_to_depopulate;
int new_state = C_ON_AGE_Q;
clock_sec_t sec;
clock_nsec_t nsec;
boolean_t head_insert = FALSE;
unused_bytes = trunc_page_32(C_SEG_OFFSET_TO_BYTES(c_seg->c_populated_offset - c_seg->c_nextoffset));
if (unused_bytes) {
offset_to_depopulate = C_SEG_BYTES_TO_OFFSET(round_page_32(C_SEG_OFFSET_TO_BYTES(c_seg->c_nextoffset)));
lck_mtx_unlock_always(&c_seg->c_lock);
kernel_memory_depopulate(
compressor_map,
(vm_offset_t) &c_seg->c_store.c_buffer[offset_to_depopulate],
unused_bytes,
KMA_COMPRESSOR,
VM_KERN_MEMORY_COMPRESSOR);
lck_mtx_lock_spin_always(&c_seg->c_lock);
c_seg->c_populated_offset = offset_to_depopulate;
}
assert(C_SEG_OFFSET_TO_BYTES(c_seg->c_populated_offset) <= C_SEG_BUFSIZE);
#if DEVELOPMENT || DEBUG
{
boolean_t c_seg_was_busy = FALSE;
if (!c_seg->c_busy) {
C_SEG_BUSY(c_seg);
} else {
c_seg_was_busy = TRUE;
}
lck_mtx_unlock_always(&c_seg->c_lock);
C_SEG_WRITE_PROTECT(c_seg);
lck_mtx_lock_spin_always(&c_seg->c_lock);
if (c_seg_was_busy == FALSE) {
C_SEG_WAKEUP_DONE(c_seg);
}
}
#endif
#if CONFIG_FREEZE
if (current_chead == (c_segment_t*) &(freezer_context_global.freezer_ctx_chead) &&
VM_CONFIG_SWAP_IS_PRESENT &&
VM_CONFIG_FREEZER_SWAP_IS_ACTIVE
#if DEVELOPMENT || DEBUG
&& !memorystatus_freeze_to_memory
#endif
) {
new_state = C_ON_SWAPOUT_Q;
}
#endif
if (vm_darkwake_mode == TRUE) {
new_state = C_ON_SWAPOUT_Q;
head_insert = TRUE;
}
clock_get_system_nanotime(&sec, &nsec);
c_seg->c_creation_ts = (uint32_t)sec;
lck_mtx_lock_spin_always(c_list_lock);
c_seg->c_generation_id = c_generation_id++;
c_seg_switch_state(c_seg, new_state, head_insert);
#if CONFIG_FREEZE
if (c_seg->c_state == C_ON_SWAPOUT_Q) {
assert(vm_darkwake_mode == FALSE);
c_seg_update_task_owner(c_seg, freezer_context_global.freezer_ctx_task);
freezer_context_global.freezer_ctx_swapped_bytes += c_seg->c_bytes_used;
}
#endif
if (c_seg->c_state == C_ON_AGE_Q && C_SEG_UNUSED_BYTES(c_seg) >= PAGE_SIZE) {
#if CONFIG_FREEZE
assert(c_seg->c_task_owner == NULL);
#endif
c_seg_need_delayed_compaction(c_seg, TRUE);
}
lck_mtx_unlock_always(c_list_lock);
if (c_seg->c_state == C_ON_SWAPOUT_Q) {
thread_wakeup((event_t)&c_swapout_list_head);
}
*current_chead = NULL;
}
void
c_seg_swapin_requeue(c_segment_t c_seg, boolean_t has_data, boolean_t minor_compact_ok, boolean_t age_on_swapin_q)
{
clock_sec_t sec;
clock_nsec_t nsec;
clock_get_system_nanotime(&sec, &nsec);
lck_mtx_lock_spin_always(c_list_lock);
lck_mtx_lock_spin_always(&c_seg->c_lock);
assert(c_seg->c_busy_swapping);
assert(c_seg->c_busy);
c_seg->c_busy_swapping = 0;
if (c_seg->c_overage_swap == TRUE) {
c_overage_swapped_count--;
c_seg->c_overage_swap = FALSE;
}
if (has_data == TRUE) {
if (age_on_swapin_q == TRUE) {
c_seg_switch_state(c_seg, C_ON_SWAPPEDIN_Q, FALSE);
} else {
c_seg_switch_state(c_seg, C_ON_AGE_Q, FALSE);
}
if (minor_compact_ok == TRUE && !c_seg->c_on_minorcompact_q && C_SEG_UNUSED_BYTES(c_seg) >= PAGE_SIZE) {
c_seg_need_delayed_compaction(c_seg, TRUE);
}
} else {
c_seg->c_store.c_buffer = (int32_t*) NULL;
c_seg->c_populated_offset = C_SEG_BYTES_TO_OFFSET(0);
c_seg_switch_state(c_seg, C_ON_BAD_Q, FALSE);
}
c_seg->c_swappedin_ts = (uint32_t)sec;
lck_mtx_unlock_always(c_list_lock);
}
int
c_seg_swapin(c_segment_t c_seg, boolean_t force_minor_compaction, boolean_t age_on_swapin_q)
{
vm_offset_t addr = 0;
uint32_t io_size = 0;
uint64_t f_offset;
assert(C_SEG_IS_ONDISK(c_seg));
#if !CHECKSUM_THE_SWAP
c_seg_trim_tail(c_seg);
#endif
io_size = round_page_32(C_SEG_OFFSET_TO_BYTES(c_seg->c_populated_offset));
f_offset = c_seg->c_store.c_swap_handle;
C_SEG_BUSY(c_seg);
c_seg->c_busy_swapping = 1;
set_thread_rwlock_boost();
lck_mtx_unlock_always(&c_seg->c_lock);
PAGE_REPLACEMENT_DISALLOWED(FALSE);
addr = (vm_offset_t)C_SEG_BUFFER_ADDRESS(c_seg->c_mysegno);
c_seg->c_store.c_buffer = (int32_t*) addr;
kernel_memory_populate(compressor_map, addr, io_size, KMA_COMPRESSOR, VM_KERN_MEMORY_COMPRESSOR);
if (vm_swap_get(c_seg, f_offset, io_size) != KERN_SUCCESS) {
PAGE_REPLACEMENT_DISALLOWED(TRUE);
kernel_memory_depopulate(compressor_map, addr, io_size, KMA_COMPRESSOR, VM_KERN_MEMORY_COMPRESSOR);
c_seg_swapin_requeue(c_seg, FALSE, TRUE, age_on_swapin_q);
} else {
#if ENCRYPTED_SWAP
vm_swap_decrypt(c_seg);
#endif
#if CHECKSUM_THE_SWAP
if (c_seg->cseg_swap_size != io_size) {
panic("swapin size doesn't match swapout size");
}
if (c_seg->cseg_hash != vmc_hash((char*) c_seg->c_store.c_buffer, (int)io_size)) {
panic("c_seg_swapin - Swap hash mismatch\n");
}
#endif
PAGE_REPLACEMENT_DISALLOWED(TRUE);
c_seg_swapin_requeue(c_seg, TRUE, force_minor_compaction == TRUE ? FALSE : TRUE, age_on_swapin_q);
#if CONFIG_FREEZE
if (!lck_mtx_try_lock_spin_always(c_list_lock)) {
assert(c_seg->c_busy);
lck_mtx_unlock_always(&c_seg->c_lock);
lck_mtx_lock_spin_always(c_list_lock);
lck_mtx_lock_spin_always(&c_seg->c_lock);
}
if (c_seg->c_task_owner) {
c_seg_update_task_owner(c_seg, NULL);
}
lck_mtx_unlock_always(c_list_lock);
OSAddAtomic(c_seg->c_slots_used, &c_segment_pages_compressed_incore);
#endif
OSAddAtomic64(c_seg->c_bytes_used, &compressor_bytes_used);
if (force_minor_compaction == TRUE) {
if (c_seg_minor_compaction_and_unlock(c_seg, FALSE)) {
clear_thread_rwlock_boost();
return 1;
}
lck_mtx_lock_spin_always(&c_seg->c_lock);
}
}
C_SEG_WAKEUP_DONE(c_seg);
clear_thread_rwlock_boost();
return 0;
}
static void
c_segment_sv_hash_drop_ref(int hash_indx)
{
struct c_sv_hash_entry o_sv_he, n_sv_he;
while (1) {
o_sv_he.he_record = c_segment_sv_hash_table[hash_indx].he_record;
n_sv_he.he_ref = o_sv_he.he_ref - 1;
n_sv_he.he_data = o_sv_he.he_data;
if (OSCompareAndSwap64((UInt64)o_sv_he.he_record, (UInt64)n_sv_he.he_record, (UInt64 *) &c_segment_sv_hash_table[hash_indx].he_record) == TRUE) {
if (n_sv_he.he_ref == 0) {
OSAddAtomic(-1, &c_segment_svp_in_hash);
}
break;
}
}
}
static int
c_segment_sv_hash_insert(uint32_t data)
{
int hash_sindx;
int misses;
struct c_sv_hash_entry o_sv_he, n_sv_he;
boolean_t got_ref = FALSE;
if (data == 0) {
OSAddAtomic(1, &c_segment_svp_zero_compressions);
} else {
OSAddAtomic(1, &c_segment_svp_nonzero_compressions);
}
hash_sindx = data & C_SV_HASH_MASK;
for (misses = 0; misses < C_SV_HASH_MAX_MISS; misses++) {
o_sv_he.he_record = c_segment_sv_hash_table[hash_sindx].he_record;
while (o_sv_he.he_data == data || o_sv_he.he_ref == 0) {
n_sv_he.he_ref = o_sv_he.he_ref + 1;
n_sv_he.he_data = data;
if (OSCompareAndSwap64((UInt64)o_sv_he.he_record, (UInt64)n_sv_he.he_record, (UInt64 *) &c_segment_sv_hash_table[hash_sindx].he_record) == TRUE) {
if (n_sv_he.he_ref == 1) {
OSAddAtomic(1, &c_segment_svp_in_hash);
}
got_ref = TRUE;
break;
}
o_sv_he.he_record = c_segment_sv_hash_table[hash_sindx].he_record;
}
if (got_ref == TRUE) {
break;
}
hash_sindx++;
if (hash_sindx == C_SV_HASH_SIZE) {
hash_sindx = 0;
}
}
if (got_ref == FALSE) {
return -1;
}
return hash_sindx;
}
#if RECORD_THE_COMPRESSED_DATA
static void
c_compressed_record_data(char *src, int c_size)
{
if ((c_compressed_record_cptr + c_size + 4) >= c_compressed_record_ebuf) {
panic("c_compressed_record_cptr >= c_compressed_record_ebuf");
}
*(int *)((void *)c_compressed_record_cptr) = c_size;
c_compressed_record_cptr += 4;
memcpy(c_compressed_record_cptr, src, c_size);
c_compressed_record_cptr += c_size;
}
#endif
static int
c_compress_page(char *src, c_slot_mapping_t slot_ptr, c_segment_t *current_chead, char *scratch_buf)
{
int c_size;
int c_rounded_size = 0;
int max_csize;
c_slot_t cs;
c_segment_t c_seg;
KERNEL_DEBUG(0xe0400000 | DBG_FUNC_START, *current_chead, 0, 0, 0, 0);
retry:
if ((c_seg = c_seg_allocate(current_chead)) == NULL) {
return 1;
}
assert(c_seg->c_state == C_IS_FILLING);
cs = C_SEG_SLOT_FROM_INDEX(c_seg, c_seg->c_nextslot);
C_SLOT_ASSERT_PACKABLE(slot_ptr);
cs->c_packed_ptr = C_SLOT_PACK_PTR(slot_ptr);
cs->c_offset = c_seg->c_nextoffset;
max_csize = C_SEG_BUFSIZE - C_SEG_OFFSET_TO_BYTES((int32_t)cs->c_offset);
if (max_csize > PAGE_SIZE) {
max_csize = PAGE_SIZE;
}
#if CHECKSUM_THE_DATA
cs->c_hash_data = vmc_hash(src, PAGE_SIZE);
#endif
boolean_t incomp_copy = FALSE;
int max_csize_adj = (max_csize - 4);
if (vm_compressor_algorithm() != VM_COMPRESSOR_DEFAULT_CODEC) {
#if defined(__arm__) || defined(__arm64__)
uint16_t ccodec = CINVALID;
uint32_t inline_popcount;
if (max_csize >= C_SEG_OFFSET_ALIGNMENT_BOUNDARY) {
c_size = metacompressor((const uint8_t *) src,
(uint8_t *) &c_seg->c_store.c_buffer[cs->c_offset],
max_csize_adj, &ccodec,
scratch_buf, &incomp_copy, &inline_popcount);
#if __ARM_WKDM_POPCNT__
cs->c_inline_popcount = inline_popcount;
#else
assert(inline_popcount == C_SLOT_NO_POPCOUNT);
#endif
#if C_SEG_OFFSET_ALIGNMENT_BOUNDARY > 4
if (c_size > max_csize_adj) {
c_size = -1;
}
#endif
} else {
c_size = -1;
}
assert(ccodec == CCWK || ccodec == CCLZ4);
cs->c_codec = ccodec;
#endif
} else {
#if defined(__arm__) || defined(__arm64__)
cs->c_codec = CCWK;
#endif
#if defined(__arm64__)
__unreachable_ok_push
if (PAGE_SIZE == 4096) {
c_size = WKdm_compress_4k((WK_word *)(uintptr_t)src, (WK_word *)(uintptr_t)&c_seg->c_store.c_buffer[cs->c_offset],
(WK_word *)(uintptr_t)scratch_buf, max_csize_adj);
} else {
c_size = WKdm_compress_16k((WK_word *)(uintptr_t)src, (WK_word *)(uintptr_t)&c_seg->c_store.c_buffer[cs->c_offset],
(WK_word *)(uintptr_t)scratch_buf, max_csize_adj);
}
__unreachable_ok_pop
#else
c_size = WKdm_compress_new((const WK_word *)(uintptr_t)src, (WK_word *)(uintptr_t)&c_seg->c_store.c_buffer[cs->c_offset],
(WK_word *)(uintptr_t)scratch_buf, max_csize_adj);
#endif
}
assertf(((c_size <= max_csize_adj) && (c_size >= -1)),
"c_size invalid (%d, %d), cur compressions: %d", c_size, max_csize_adj, c_segment_pages_compressed);
if (c_size == -1) {
if (max_csize < PAGE_SIZE) {
c_current_seg_filled(c_seg, current_chead);
assert(*current_chead == NULL);
lck_mtx_unlock_always(&c_seg->c_lock);
PAGE_REPLACEMENT_DISALLOWED(FALSE);
goto retry;
}
c_size = PAGE_SIZE;
if (incomp_copy == FALSE) {
memcpy(&c_seg->c_store.c_buffer[cs->c_offset], src, c_size);
}
OSAddAtomic(1, &c_segment_noncompressible_pages);
} else if (c_size == 0) {
int hash_index;
hash_index = c_segment_sv_hash_insert(*(uint32_t *)(uintptr_t)src);
if (hash_index != -1) {
slot_ptr->s_cindx = hash_index;
slot_ptr->s_cseg = C_SV_CSEG_ID;
OSAddAtomic(1, &c_segment_svp_hash_succeeded);
#if RECORD_THE_COMPRESSED_DATA
c_compressed_record_data(src, 4);
#endif
goto sv_compression;
}
c_size = 4;
memcpy(&c_seg->c_store.c_buffer[cs->c_offset], src, c_size);
OSAddAtomic(1, &c_segment_svp_hash_failed);
}
#if RECORD_THE_COMPRESSED_DATA
c_compressed_record_data((char *)&c_seg->c_store.c_buffer[cs->c_offset], c_size);
#endif
#if CHECKSUM_THE_COMPRESSED_DATA
cs->c_hash_compressed_data = vmc_hash((char *)&c_seg->c_store.c_buffer[cs->c_offset], c_size);
#endif
#if POPCOUNT_THE_COMPRESSED_DATA
cs->c_pop_cdata = vmc_pop((uintptr_t) &c_seg->c_store.c_buffer[cs->c_offset], c_size);
#endif
c_rounded_size = (c_size + C_SEG_OFFSET_ALIGNMENT_MASK) & ~C_SEG_OFFSET_ALIGNMENT_MASK;
PACK_C_SIZE(cs, c_size);
c_seg->c_bytes_used += c_rounded_size;
c_seg->c_nextoffset += C_SEG_BYTES_TO_OFFSET(c_rounded_size);
c_seg->c_slots_used++;
slot_ptr->s_cindx = c_seg->c_nextslot++;
slot_ptr->s_cseg = c_seg->c_mysegno + 1;
sv_compression:
if (c_seg->c_nextoffset >= C_SEG_OFF_LIMIT || c_seg->c_nextslot >= C_SLOT_MAX_INDEX) {
c_current_seg_filled(c_seg, current_chead);
assert(*current_chead == NULL);
}
lck_mtx_unlock_always(&c_seg->c_lock);
PAGE_REPLACEMENT_DISALLOWED(FALSE);
#if RECORD_THE_COMPRESSED_DATA
if ((c_compressed_record_cptr - c_compressed_record_sbuf) >= C_SEG_ALLOCSIZE) {
c_compressed_record_write(c_compressed_record_sbuf, (int)(c_compressed_record_cptr - c_compressed_record_sbuf));
c_compressed_record_cptr = c_compressed_record_sbuf;
}
#endif
if (c_size) {
OSAddAtomic64(c_size, &c_segment_compressed_bytes);
OSAddAtomic64(c_rounded_size, &compressor_bytes_used);
}
OSAddAtomic64(PAGE_SIZE, &c_segment_input_bytes);
OSAddAtomic(1, &c_segment_pages_compressed);
#if CONFIG_FREEZE
OSAddAtomic(1, &c_segment_pages_compressed_incore);
#endif
OSAddAtomic(1, &sample_period_compression_count);
KERNEL_DEBUG(0xe0400000 | DBG_FUNC_END, *current_chead, c_size, c_segment_input_bytes, c_segment_compressed_bytes, 0);
return 0;
}
static inline void
sv_decompress(int32_t *ddst, int32_t pattern)
{
#if defined(__x86_64__)
memset_word(ddst, pattern, PAGE_SIZE / sizeof(int32_t));
#elif defined(__arm64__)
assert((PAGE_SIZE % 128) == 0);
if (pattern == 0) {
fill32_dczva((addr64_t)ddst, PAGE_SIZE);
} else {
fill32_nt((addr64_t)ddst, PAGE_SIZE, pattern);
}
#else
size_t i;
__unreachable_ok_push
if (PAGE_SIZE == 4096) {
for (i = 0; i < (4096U / sizeof(int32_t)); i += 4) {
*ddst++ = pattern;
*ddst++ = pattern;
*ddst++ = pattern;
*ddst++ = pattern;
}
} else {
assert(PAGE_SIZE == 16384);
for (i = 0; i < (int)(16384U / sizeof(int32_t)); i += 4) {
*ddst++ = pattern;
*ddst++ = pattern;
*ddst++ = pattern;
*ddst++ = pattern;
}
}
__unreachable_ok_pop
#endif
}
static int
c_decompress_page(char *dst, volatile c_slot_mapping_t slot_ptr, int flags, int *zeroslot)
{
c_slot_t cs;
c_segment_t c_seg;
uint32_t c_segno;
uint16_t c_indx;
int c_rounded_size;
uint32_t c_size;
int retval = 0;
boolean_t need_unlock = TRUE;
boolean_t consider_defragmenting = FALSE;
boolean_t kdp_mode = FALSE;
if (__improbable(flags & C_KDP)) {
if (not_in_kdp) {
panic("C_KDP passed to decompress page from outside of debugger context");
}
assert((flags & C_KEEP) == C_KEEP);
assert((flags & C_DONT_BLOCK) == C_DONT_BLOCK);
if ((flags & (C_DONT_BLOCK | C_KEEP)) != (C_DONT_BLOCK | C_KEEP)) {
return -2;
}
kdp_mode = TRUE;
*zeroslot = 0;
}
ReTry:
if (__probable(!kdp_mode)) {
PAGE_REPLACEMENT_DISALLOWED(TRUE);
} else {
if (kdp_lck_rw_lock_is_acquired_exclusive(&c_master_lock)) {
return -2;
}
}
#if HIBERNATION
if (__improbable(dst && decompressions_blocked == TRUE)) {
if (flags & C_DONT_BLOCK) {
if (__probable(!kdp_mode)) {
PAGE_REPLACEMENT_DISALLOWED(FALSE);
}
*zeroslot = 0;
return -2;
}
assert_wait((event_t)&decompressions_blocked, THREAD_UNINT);
PAGE_REPLACEMENT_DISALLOWED(FALSE);
thread_block(THREAD_CONTINUE_NULL);
goto ReTry;
}
#endif
c_segno = slot_ptr->s_cseg - 1;
if (__improbable(c_segno >= c_segments_available)) {
panic("c_decompress_page: c_segno %d >= c_segments_available %d, slot_ptr(%p), slot_data(%x)",
c_segno, c_segments_available, slot_ptr, *(int *)((void *)slot_ptr));
}
if (__improbable(c_segments[c_segno].c_segno < c_segments_available)) {
panic("c_decompress_page: c_segno %d is free, slot_ptr(%p), slot_data(%x)",
c_segno, slot_ptr, *(int *)((void *)slot_ptr));
}
c_seg = c_segments[c_segno].c_seg;
if (__probable(!kdp_mode)) {
lck_mtx_lock_spin_always(&c_seg->c_lock);
} else {
if (kdp_lck_mtx_lock_spin_is_acquired(&c_seg->c_lock)) {
return -2;
}
}
assert(c_seg->c_state != C_IS_EMPTY && c_seg->c_state != C_IS_FREE);
if (dst == NULL && c_seg->c_busy_swapping) {
assert(c_seg->c_busy);
goto bypass_busy_check;
}
if (flags & C_DONT_BLOCK) {
if (c_seg->c_busy || (C_SEG_IS_ONDISK(c_seg) && dst)) {
*zeroslot = 0;
retval = -2;
goto done;
}
}
if (c_seg->c_busy) {
PAGE_REPLACEMENT_DISALLOWED(FALSE);
c_seg_wait_on_busy(c_seg);
goto ReTry;
}
bypass_busy_check:
c_indx = slot_ptr->s_cindx;
if (__improbable(c_indx >= c_seg->c_nextslot)) {
panic("c_decompress_page: c_indx %d >= c_nextslot %d, c_seg(%p), slot_ptr(%p), slot_data(%x)",
c_indx, c_seg->c_nextslot, c_seg, slot_ptr, *(int *)((void *)slot_ptr));
}
cs = C_SEG_SLOT_FROM_INDEX(c_seg, c_indx);
c_size = UNPACK_C_SIZE(cs);
if (__improbable(c_size == 0)) {
panic("c_decompress_page: c_size == 0, c_seg(%p), slot_ptr(%p), slot_data(%x)",
c_seg, slot_ptr, *(int *)((void *)slot_ptr));
}
c_rounded_size = (c_size + C_SEG_OFFSET_ALIGNMENT_MASK) & ~C_SEG_OFFSET_ALIGNMENT_MASK;
if (dst) {
uint32_t age_of_cseg;
clock_sec_t cur_ts_sec;
clock_nsec_t cur_ts_nsec;
if (C_SEG_IS_ONDISK(c_seg)) {
#if CONFIG_FREEZE
if (freezer_incore_cseg_acct) {
if ((c_seg->c_slots_used + c_segment_pages_compressed_incore) >= c_segment_pages_compressed_nearing_limit) {
PAGE_REPLACEMENT_DISALLOWED(FALSE);
lck_mtx_unlock_always(&c_seg->c_lock);
memorystatus_kill_on_VM_compressor_space_shortage(FALSE );
goto ReTry;
}
uint32_t incore_seg_count = c_segment_count - c_swappedout_count - c_swappedout_sparse_count;
if ((incore_seg_count + 1) >= c_segments_nearing_limit) {
PAGE_REPLACEMENT_DISALLOWED(FALSE);
lck_mtx_unlock_always(&c_seg->c_lock);
memorystatus_kill_on_VM_compressor_space_shortage(FALSE );
goto ReTry;
}
}
#endif
assert(kdp_mode == FALSE);
retval = c_seg_swapin(c_seg, FALSE, TRUE);
assert(retval == 0);
retval = 1;
}
if (c_seg->c_state == C_ON_BAD_Q) {
assert(c_seg->c_store.c_buffer == NULL);
*zeroslot = 0;
retval = -1;
goto done;
}
#if POPCOUNT_THE_COMPRESSED_DATA
unsigned csvpop;
uintptr_t csvaddr = (uintptr_t) &c_seg->c_store.c_buffer[cs->c_offset];
if (cs->c_pop_cdata != (csvpop = vmc_pop(csvaddr, c_size))) {
panic("Compressed data popcount doesn't match original, bit distance: %d %p (phys: %p) %p %p 0x%x 0x%x 0x%x 0x%x", (csvpop - cs->c_pop_cdata), (void *)csvaddr, (void *) kvtophys(csvaddr), c_seg, cs, cs->c_offset, c_size, csvpop, cs->c_pop_cdata);
}
#endif
#if CHECKSUM_THE_COMPRESSED_DATA
unsigned csvhash;
if (cs->c_hash_compressed_data != (csvhash = vmc_hash((char *)&c_seg->c_store.c_buffer[cs->c_offset], c_size))) {
panic("Compressed data doesn't match original %p %p %u %u %u", c_seg, cs, c_size, cs->c_hash_compressed_data, csvhash);
}
#endif
if (c_rounded_size == PAGE_SIZE) {
memcpy(dst, &c_seg->c_store.c_buffer[cs->c_offset], PAGE_SIZE);
} else if (c_size == 4) {
int32_t data;
int32_t *dptr;
dptr = (int32_t *)(uintptr_t)dst;
data = *(int32_t *)(&c_seg->c_store.c_buffer[cs->c_offset]);
sv_decompress(dptr, data);
} else {
uint32_t my_cpu_no;
char *scratch_buf;
if (__probable(!kdp_mode)) {
my_cpu_no = cpu_number();
assert(my_cpu_no < compressor_cpus);
scratch_buf = &compressor_scratch_bufs[my_cpu_no * vm_compressor_get_decode_scratch_size()];
} else {
scratch_buf = kdp_compressor_scratch_buf;
}
if (vm_compressor_algorithm() != VM_COMPRESSOR_DEFAULT_CODEC) {
#if defined(__arm__) || defined(__arm64__)
uint16_t c_codec = cs->c_codec;
uint32_t inline_popcount;
if (!metadecompressor((const uint8_t *) &c_seg->c_store.c_buffer[cs->c_offset],
(uint8_t *)dst, c_size, c_codec, (void *)scratch_buf, &inline_popcount)) {
retval = -1;
} else {
#if __ARM_WKDM_POPCNT__
if (inline_popcount != cs->c_inline_popcount) {
assert(inline_popcount != C_SLOT_NO_POPCOUNT);
assert(cs->c_inline_popcount != C_SLOT_NO_POPCOUNT);
printf("decompression failure from physical region %llx+%05x: popcount mismatch (%d != %d)\n",
(unsigned long long)kvtophys((uintptr_t)&c_seg->c_store.c_buffer[cs->c_offset]), c_size,
inline_popcount,
cs->c_inline_popcount);
retval = -1;
}
#else
assert(inline_popcount == C_SLOT_NO_POPCOUNT);
#endif
}
#endif
} else {
#if defined(__arm64__)
__unreachable_ok_push
if (PAGE_SIZE == 4096) {
WKdm_decompress_4k((WK_word *)(uintptr_t)&c_seg->c_store.c_buffer[cs->c_offset],
(WK_word *)(uintptr_t)dst, (WK_word *)(uintptr_t)scratch_buf, c_size);
} else {
WKdm_decompress_16k((WK_word *)(uintptr_t)&c_seg->c_store.c_buffer[cs->c_offset],
(WK_word *)(uintptr_t)dst, (WK_word *)(uintptr_t)scratch_buf, c_size);
}
__unreachable_ok_pop
#else
WKdm_decompress_new((WK_word *)(uintptr_t)&c_seg->c_store.c_buffer[cs->c_offset],
(WK_word *)(uintptr_t)dst, (WK_word *)(uintptr_t)scratch_buf, c_size);
#endif
}
}
#if CHECKSUM_THE_DATA
if (cs->c_hash_data != vmc_hash(dst, PAGE_SIZE)) {
#if defined(__arm__) || defined(__arm64__)
int32_t *dinput = &c_seg->c_store.c_buffer[cs->c_offset];
panic("decompressed data doesn't match original cs: %p, hash: 0x%x, offset: %d, c_size: %d, c_rounded_size: %d, codec: %d, header: 0x%x 0x%x 0x%x", cs, cs->c_hash_data, cs->c_offset, c_size, c_rounded_size, cs->c_codec, *dinput, *(dinput + 1), *(dinput + 2));
#else
panic("decompressed data doesn't match original cs: %p, hash: %d, offset: 0x%x, c_size: %d", cs, cs->c_hash_data, cs->c_offset, c_size);
#endif
}
#endif
if (c_seg->c_swappedin_ts == 0 && !kdp_mode) {
clock_get_system_nanotime(&cur_ts_sec, &cur_ts_nsec);
age_of_cseg = (uint32_t)cur_ts_sec - c_seg->c_creation_ts;
if (age_of_cseg < DECOMPRESSION_SAMPLE_MAX_AGE) {
OSAddAtomic(1, &age_of_decompressions_during_sample_period[age_of_cseg]);
} else {
OSAddAtomic(1, &overage_decompressions_during_sample_period);
}
OSAddAtomic(1, &sample_period_decompression_count);
}
}
#if CONFIG_FREEZE
else {
if (C_SEG_IS_ONDISK(c_seg)) {
if (c_seg->c_task_owner) {
task_update_frozen_to_swap_acct(c_seg->c_task_owner, PAGE_SIZE_64, DEBIT_FROM_SWAP);
}
OSAddAtomic(1, &c_segment_pages_compressed_incore);
}
}
#endif
if (flags & C_KEEP) {
*zeroslot = 0;
goto done;
}
assert(kdp_mode == FALSE);
c_seg->c_bytes_unused += c_rounded_size;
c_seg->c_bytes_used -= c_rounded_size;
assert(c_seg->c_slots_used);
c_seg->c_slots_used--;
PACK_C_SIZE(cs, 0);
if (c_indx < c_seg->c_firstemptyslot) {
c_seg->c_firstemptyslot = c_indx;
}
OSAddAtomic(-1, &c_segment_pages_compressed);
#if CONFIG_FREEZE
OSAddAtomic(-1, &c_segment_pages_compressed_incore);
assertf(c_segment_pages_compressed_incore >= 0, "-ve incore count %p 0x%x", c_seg, c_segment_pages_compressed_incore);
#endif
if (c_seg->c_state != C_ON_BAD_Q && !(C_SEG_IS_ONDISK(c_seg))) {
OSAddAtomic64(-c_rounded_size, &compressor_bytes_used);
}
if (c_seg->c_busy_swapping) {
assert(c_seg->c_busy);
goto done;
}
assert(!c_seg->c_busy);
if (c_seg->c_state != C_IS_FILLING) {
if (c_seg->c_bytes_used == 0) {
if (!(C_SEG_IS_ONDISK(c_seg))) {
int pages_populated;
pages_populated = (round_page_32(C_SEG_OFFSET_TO_BYTES(c_seg->c_populated_offset))) / PAGE_SIZE;
c_seg->c_populated_offset = C_SEG_BYTES_TO_OFFSET(0);
if (pages_populated) {
assert(c_seg->c_state != C_ON_BAD_Q);
assert(c_seg->c_store.c_buffer != NULL);
C_SEG_BUSY(c_seg);
lck_mtx_unlock_always(&c_seg->c_lock);
kernel_memory_depopulate(compressor_map,
(vm_offset_t) c_seg->c_store.c_buffer,
pages_populated * PAGE_SIZE, KMA_COMPRESSOR, VM_KERN_MEMORY_COMPRESSOR);
lck_mtx_lock_spin_always(&c_seg->c_lock);
C_SEG_WAKEUP_DONE(c_seg);
}
if (!c_seg->c_on_minorcompact_q && c_seg->c_state != C_ON_SWAPOUT_Q && c_seg->c_state != C_ON_SWAPIO_Q) {
c_seg_need_delayed_compaction(c_seg, FALSE);
}
} else {
if (c_seg->c_state != C_ON_SWAPPEDOUTSPARSE_Q) {
c_seg_move_to_sparse_list(c_seg);
consider_defragmenting = TRUE;
}
}
} else if (c_seg->c_on_minorcompact_q) {
assert(c_seg->c_state != C_ON_BAD_Q);
assert(!C_SEG_IS_ON_DISK_OR_SOQ(c_seg));
if (C_SEG_SHOULD_MINORCOMPACT_NOW(c_seg)) {
c_seg_try_minor_compaction_and_unlock(c_seg);
need_unlock = FALSE;
}
} else if (!(C_SEG_IS_ONDISK(c_seg))) {
if (c_seg->c_state != C_ON_BAD_Q && c_seg->c_state != C_ON_SWAPOUT_Q && c_seg->c_state != C_ON_SWAPIO_Q &&
C_SEG_UNUSED_BYTES(c_seg) >= PAGE_SIZE) {
c_seg_need_delayed_compaction(c_seg, FALSE);
}
} else if (c_seg->c_state != C_ON_SWAPPEDOUTSPARSE_Q && C_SEG_ONDISK_IS_SPARSE(c_seg)) {
c_seg_move_to_sparse_list(c_seg);
consider_defragmenting = TRUE;
}
}
done:
if (__improbable(kdp_mode)) {
return retval;
}
if (need_unlock == TRUE) {
lck_mtx_unlock_always(&c_seg->c_lock);
}
PAGE_REPLACEMENT_DISALLOWED(FALSE);
if (consider_defragmenting == TRUE) {
vm_swap_consider_defragmenting(VM_SWAP_FLAGS_NONE);
}
#if !XNU_TARGET_OS_OSX
if ((c_minor_count && COMPRESSOR_NEEDS_TO_MINOR_COMPACT()) || vm_compressor_needs_to_major_compact()) {
vm_wake_compactor_swapper();
}
#endif
return retval;
}
int
vm_compressor_get(ppnum_t pn, int *slot, int flags)
{
c_slot_mapping_t slot_ptr;
char *dst;
int zeroslot = 1;
int retval;
dst = pmap_map_compressor_page(pn);
slot_ptr = (c_slot_mapping_t)slot;
assert(dst != NULL);
if (slot_ptr->s_cseg == C_SV_CSEG_ID) {
int32_t data;
int32_t *dptr;
dptr = (int32_t *)(uintptr_t)dst;
data = c_segment_sv_hash_table[slot_ptr->s_cindx].he_data;
sv_decompress(dptr, data);
if (!(flags & C_KEEP)) {
c_segment_sv_hash_drop_ref(slot_ptr->s_cindx);
OSAddAtomic(-1, &c_segment_pages_compressed);
#if CONFIG_FREEZE
OSAddAtomic(-1, &c_segment_pages_compressed_incore);
assertf(c_segment_pages_compressed_incore >= 0, "-ve incore count 0x%x", c_segment_pages_compressed_incore);
#endif
*slot = 0;
}
if (data) {
OSAddAtomic(1, &c_segment_svp_nonzero_decompressions);
} else {
OSAddAtomic(1, &c_segment_svp_zero_decompressions);
}
pmap_unmap_compressor_page(pn, dst);
return 0;
}
retval = c_decompress_page(dst, slot_ptr, flags, &zeroslot);
if (zeroslot) {
*slot = 0;
}
pmap_unmap_compressor_page(pn, dst);
return retval;
}
#if DEVELOPMENT || DEBUG
void
vm_compressor_inject_error(int *slot)
{
c_slot_mapping_t slot_ptr = (c_slot_mapping_t)slot;
if (slot_ptr->s_cseg == C_SV_CSEG_ID) {
printf("%s(): cannot inject errors in SV-compressed pages\n", __func__ );
return;
}
const uint32_t c_segno = slot_ptr->s_cseg - 1;
assert(c_segno < c_segments_available);
assert(c_segments[c_segno].c_segno >= c_segments_available);
const c_segment_t c_seg = c_segments[c_segno].c_seg;
PAGE_REPLACEMENT_DISALLOWED(TRUE);
lck_mtx_lock_spin_always(&c_seg->c_lock);
assert(c_seg->c_state != C_IS_EMPTY && c_seg->c_state != C_IS_FREE);
const uint16_t c_indx = slot_ptr->s_cindx;
assert(c_indx < c_seg->c_nextslot);
while (c_seg->c_busy) {
c_seg_wait_on_busy(c_seg);
lck_mtx_lock_spin_always(&c_seg->c_lock);
}
C_SEG_BUSY(c_seg);
bool already_writable = (c_seg->c_state == C_IS_FILLING);
if (!already_writable) {
lck_mtx_unlock_always(&c_seg->c_lock);
C_SEG_MAKE_WRITEABLE(c_seg);
lck_mtx_lock_spin_always(&c_seg->c_lock);
}
if (already_writable && c_seg->c_state != C_IS_FILLING) {
lck_mtx_unlock_always(&c_seg->c_lock);
C_SEG_MAKE_WRITEABLE(c_seg);
lck_mtx_lock_spin_always(&c_seg->c_lock);
already_writable = false;
assert(c_seg->c_state != C_IS_FILLING);
}
c_slot_t cs = C_SEG_SLOT_FROM_INDEX(c_seg, c_indx);
int32_t *data = &c_seg->c_store.c_buffer[cs->c_offset];
assert(UNPACK_C_SIZE(cs) > sizeof(*data));
data[0] ^= 0x00000100;
if (!already_writable) {
lck_mtx_unlock_always(&c_seg->c_lock);
C_SEG_WRITE_PROTECT(c_seg);
lck_mtx_lock_spin_always(&c_seg->c_lock);
}
C_SEG_WAKEUP_DONE(c_seg);
lck_mtx_unlock_always(&c_seg->c_lock);
PAGE_REPLACEMENT_DISALLOWED(FALSE);
}
#endif
int
vm_compressor_free(int *slot, int flags)
{
c_slot_mapping_t slot_ptr;
int zeroslot = 1;
int retval;
assert(flags == 0 || flags == C_DONT_BLOCK);
slot_ptr = (c_slot_mapping_t)slot;
if (slot_ptr->s_cseg == C_SV_CSEG_ID) {
c_segment_sv_hash_drop_ref(slot_ptr->s_cindx);
OSAddAtomic(-1, &c_segment_pages_compressed);
#if CONFIG_FREEZE
OSAddAtomic(-1, &c_segment_pages_compressed_incore);
assertf(c_segment_pages_compressed_incore >= 0, "-ve incore count 0x%x", c_segment_pages_compressed_incore);
#endif
*slot = 0;
return 0;
}
retval = c_decompress_page(NULL, slot_ptr, flags, &zeroslot);
if (retval == 0) {
*slot = 0;
} else {
assert(retval == -2);
}
return retval;
}
int
vm_compressor_put(ppnum_t pn, int *slot, void **current_chead, char *scratch_buf)
{
char *src;
int retval;
src = pmap_map_compressor_page(pn);
assert(src != NULL);
retval = c_compress_page(src, (c_slot_mapping_t)slot, (c_segment_t *)current_chead, scratch_buf);
pmap_unmap_compressor_page(pn, src);
return retval;
}
void
vm_compressor_transfer(
int *dst_slot_p,
int *src_slot_p)
{
c_slot_mapping_t dst_slot, src_slot;
c_segment_t c_seg;
uint16_t c_indx;
c_slot_t cs;
src_slot = (c_slot_mapping_t) src_slot_p;
if (src_slot->s_cseg == C_SV_CSEG_ID) {
*dst_slot_p = *src_slot_p;
*src_slot_p = 0;
return;
}
dst_slot = (c_slot_mapping_t) dst_slot_p;
Retry:
PAGE_REPLACEMENT_DISALLOWED(TRUE);
c_seg = c_segments[src_slot->s_cseg - 1].c_seg;
lck_mtx_lock_spin_always(&c_seg->c_lock);
if (c_seg->c_busy && !c_seg->c_busy_swapping) {
PAGE_REPLACEMENT_DISALLOWED(FALSE);
c_seg_wait_on_busy(c_seg);
goto Retry;
}
c_indx = src_slot->s_cindx;
cs = C_SEG_SLOT_FROM_INDEX(c_seg, c_indx);
C_SLOT_ASSERT_PACKABLE(dst_slot);
cs->c_packed_ptr = C_SLOT_PACK_PTR(dst_slot);
*dst_slot_p = *src_slot_p;
*src_slot_p = 0;
lck_mtx_unlock_always(&c_seg->c_lock);
PAGE_REPLACEMENT_DISALLOWED(FALSE);
}
#if CONFIG_FREEZE
int freezer_finished_filling = 0;
void
vm_compressor_finished_filling(
void **current_chead)
{
c_segment_t c_seg;
if ((c_seg = *(c_segment_t *)current_chead) == NULL) {
return;
}
assert(c_seg->c_state == C_IS_FILLING);
lck_mtx_lock_spin_always(&c_seg->c_lock);
c_current_seg_filled(c_seg, (c_segment_t *)current_chead);
lck_mtx_unlock_always(&c_seg->c_lock);
freezer_finished_filling++;
}
kern_return_t
vm_compressor_relocate(
void **current_chead,
int *slot_p)
{
c_slot_mapping_t slot_ptr;
c_slot_mapping_t src_slot;
uint32_t c_rounded_size;
uint32_t c_size;
uint16_t dst_slot;
c_slot_t c_dst;
c_slot_t c_src;
uint16_t c_indx;
c_segment_t c_seg_dst = NULL;
c_segment_t c_seg_src = NULL;
kern_return_t kr = KERN_SUCCESS;
src_slot = (c_slot_mapping_t) slot_p;
if (src_slot->s_cseg == C_SV_CSEG_ID) {
return kr;
}
Relookup_dst:
c_seg_dst = c_seg_allocate((c_segment_t *)current_chead);
if (c_seg_dst == NULL) {
kr = KERN_RESOURCE_SHORTAGE;
goto out;
}
assert(c_seg_dst->c_busy == 0);
C_SEG_BUSY(c_seg_dst);
dst_slot = c_seg_dst->c_nextslot;
lck_mtx_unlock_always(&c_seg_dst->c_lock);
Relookup_src:
c_seg_src = c_segments[src_slot->s_cseg - 1].c_seg;
assert(c_seg_dst != c_seg_src);
lck_mtx_lock_spin_always(&c_seg_src->c_lock);
if (C_SEG_IS_ON_DISK_OR_SOQ(c_seg_src) ||
c_seg_src->c_state == C_IS_FILLING) {
PAGE_REPLACEMENT_DISALLOWED(FALSE);
lck_mtx_unlock_always(&c_seg_src->c_lock);
c_seg_src = NULL;
goto out;
}
if (c_seg_src->c_busy) {
PAGE_REPLACEMENT_DISALLOWED(FALSE);
c_seg_wait_on_busy(c_seg_src);
c_seg_src = NULL;
PAGE_REPLACEMENT_DISALLOWED(TRUE);
goto Relookup_src;
}
C_SEG_BUSY(c_seg_src);
lck_mtx_unlock_always(&c_seg_src->c_lock);
PAGE_REPLACEMENT_DISALLOWED(FALSE);
c_indx = src_slot->s_cindx;
c_src = C_SEG_SLOT_FROM_INDEX(c_seg_src, c_indx);
c_size = UNPACK_C_SIZE(c_src);
assert(c_size);
if (c_size > (uint32_t)(C_SEG_BUFSIZE - C_SEG_OFFSET_TO_BYTES((int32_t)c_seg_dst->c_nextoffset))) {
PAGE_REPLACEMENT_DISALLOWED(TRUE);
lck_mtx_lock_spin_always(&c_seg_src->c_lock);
C_SEG_WAKEUP_DONE(c_seg_src);
lck_mtx_unlock_always(&c_seg_src->c_lock);
c_seg_src = NULL;
lck_mtx_lock_spin_always(&c_seg_dst->c_lock);
assert(c_seg_dst->c_busy);
assert(c_seg_dst->c_state == C_IS_FILLING);
assert(!c_seg_dst->c_on_minorcompact_q);
c_current_seg_filled(c_seg_dst, (c_segment_t *)current_chead);
assert(*current_chead == NULL);
C_SEG_WAKEUP_DONE(c_seg_dst);
lck_mtx_unlock_always(&c_seg_dst->c_lock);
c_seg_dst = NULL;
PAGE_REPLACEMENT_DISALLOWED(FALSE);
goto Relookup_dst;
}
c_dst = C_SEG_SLOT_FROM_INDEX(c_seg_dst, c_seg_dst->c_nextslot);
memcpy(&c_seg_dst->c_store.c_buffer[c_seg_dst->c_nextoffset], &c_seg_src->c_store.c_buffer[c_src->c_offset], c_size);
c_rounded_size = (c_size + C_SEG_OFFSET_ALIGNMENT_MASK) & ~C_SEG_OFFSET_ALIGNMENT_MASK;
cslot_copy(c_dst, c_src);
c_dst->c_offset = c_seg_dst->c_nextoffset;
if (c_seg_dst->c_firstemptyslot == c_seg_dst->c_nextslot) {
c_seg_dst->c_firstemptyslot++;
}
c_seg_dst->c_slots_used++;
c_seg_dst->c_nextslot++;
c_seg_dst->c_bytes_used += c_rounded_size;
c_seg_dst->c_nextoffset += C_SEG_BYTES_TO_OFFSET(c_rounded_size);
PACK_C_SIZE(c_src, 0);
c_seg_src->c_bytes_used -= c_rounded_size;
c_seg_src->c_bytes_unused += c_rounded_size;
assert(c_seg_src->c_slots_used);
c_seg_src->c_slots_used--;
if (c_indx < c_seg_src->c_firstemptyslot) {
c_seg_src->c_firstemptyslot = c_indx;
}
c_dst = C_SEG_SLOT_FROM_INDEX(c_seg_dst, dst_slot);
PAGE_REPLACEMENT_ALLOWED(TRUE);
slot_ptr = C_SLOT_UNPACK_PTR(c_dst);
slot_ptr->s_cseg = c_seg_dst->c_mysegno + 1;
slot_ptr->s_cindx = dst_slot;
PAGE_REPLACEMENT_ALLOWED(FALSE);
out:
if (c_seg_src) {
lck_mtx_lock_spin_always(&c_seg_src->c_lock);
C_SEG_WAKEUP_DONE(c_seg_src);
if (c_seg_src->c_bytes_used == 0 && c_seg_src->c_state != C_IS_FILLING) {
if (!c_seg_src->c_on_minorcompact_q) {
c_seg_need_delayed_compaction(c_seg_src, FALSE);
}
}
lck_mtx_unlock_always(&c_seg_src->c_lock);
}
if (c_seg_dst) {
PAGE_REPLACEMENT_DISALLOWED(TRUE);
lck_mtx_lock_spin_always(&c_seg_dst->c_lock);
if (c_seg_dst->c_nextoffset >= C_SEG_OFF_LIMIT || c_seg_dst->c_nextslot >= C_SLOT_MAX_INDEX) {
assert(c_seg_dst->c_busy);
assert(c_seg_dst->c_state == C_IS_FILLING);
assert(!c_seg_dst->c_on_minorcompact_q);
c_current_seg_filled(c_seg_dst, (c_segment_t *)current_chead);
assert(*current_chead == NULL);
}
C_SEG_WAKEUP_DONE(c_seg_dst);
lck_mtx_unlock_always(&c_seg_dst->c_lock);
c_seg_dst = NULL;
PAGE_REPLACEMENT_DISALLOWED(FALSE);
}
return kr;
}
#endif