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qemu/migration/dirtyrate.c
Gavin Shan 1e493be587 migration: Add last stage indicator to global dirty log 
The global dirty log synchronization is used when KVM and dirty ring
are enabled. There is a particularity for ARM64 where the backup
bitmap is used to track dirty pages in non-running-vcpu situations.
It means the dirty ring works with the combination of ring buffer
and backup bitmap. The dirty bits in the backup bitmap needs to
collected in the last stage of live migration.

In order to identify the last stage of live migration and pass it
down, an extra parameter is added to the relevant functions and
callbacks. This last stage indicator isn't used until the dirty
ring is enabled in the subsequent patches.

No functional change intended.

Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Tested-by: Zhenyu Zhang <zhenyzha@redhat.com>
Message-Id: <20230509022122.20888-2-gshan@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-05-18 08:53:50 +02:00

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/*
* Dirtyrate implement code
*
* Copyright (c) 2020 HUAWEI TECHNOLOGIES CO.,LTD.
*
* Authors:
* Chuan Zheng <zhengchuan@huawei.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include <zlib.h>
#include "hw/core/cpu.h"
#include "qapi/error.h"
#include "exec/ramblock.h"
#include "exec/target_page.h"
#include "qemu/rcu_queue.h"
#include "qemu/main-loop.h"
#include "qapi/qapi-commands-migration.h"
#include "ram.h"
#include "trace.h"
#include "dirtyrate.h"
#include "monitor/hmp.h"
#include "monitor/monitor.h"
#include "qapi/qmp/qdict.h"
#include "sysemu/kvm.h"
#include "sysemu/runstate.h"
#include "exec/memory.h"
#include "qemu/xxhash.h"
/*
* total_dirty_pages is procted by BQL and is used
* to stat dirty pages during the period of two
* memory_global_dirty_log_sync
*/
uint64_t total_dirty_pages;
typedef struct DirtyPageRecord {
uint64_t start_pages;
uint64_t end_pages;
} DirtyPageRecord;
static int CalculatingState = DIRTY_RATE_STATUS_UNSTARTED;
static struct DirtyRateStat DirtyStat;
static DirtyRateMeasureMode dirtyrate_mode =
DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING;
static int64_t dirty_stat_wait(int64_t msec, int64_t initial_time)
{
int64_t current_time;
current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
if ((current_time - initial_time) >= msec) {
msec = current_time - initial_time;
} else {
g_usleep((msec + initial_time - current_time) * 1000);
}
return msec;
}
static inline void record_dirtypages(DirtyPageRecord *dirty_pages,
CPUState *cpu, bool start)
{
if (start) {
dirty_pages[cpu->cpu_index].start_pages = cpu->dirty_pages;
} else {
dirty_pages[cpu->cpu_index].end_pages = cpu->dirty_pages;
}
}
static int64_t do_calculate_dirtyrate(DirtyPageRecord dirty_pages,
int64_t calc_time_ms)
{
uint64_t increased_dirty_pages =
dirty_pages.end_pages - dirty_pages.start_pages;
uint64_t memory_size_MiB = qemu_target_pages_to_MiB(increased_dirty_pages);
return memory_size_MiB * 1000 / calc_time_ms;
}
void global_dirty_log_change(unsigned int flag, bool start)
{
qemu_mutex_lock_iothread();
if (start) {
memory_global_dirty_log_start(flag);
} else {
memory_global_dirty_log_stop(flag);
}
qemu_mutex_unlock_iothread();
}
/*
* global_dirty_log_sync
* 1. sync dirty log from kvm
* 2. stop dirty tracking if needed.
*/
static void global_dirty_log_sync(unsigned int flag, bool one_shot)
{
qemu_mutex_lock_iothread();
memory_global_dirty_log_sync(false);
if (one_shot) {
memory_global_dirty_log_stop(flag);
}
qemu_mutex_unlock_iothread();
}
static DirtyPageRecord *vcpu_dirty_stat_alloc(VcpuStat *stat)
{
CPUState *cpu;
int nvcpu = 0;
CPU_FOREACH(cpu) {
nvcpu++;
}
stat->nvcpu = nvcpu;
stat->rates = g_new0(DirtyRateVcpu, nvcpu);
return g_new0(DirtyPageRecord, nvcpu);
}
static void vcpu_dirty_stat_collect(VcpuStat *stat,
DirtyPageRecord *records,
bool start)
{
CPUState *cpu;
CPU_FOREACH(cpu) {
record_dirtypages(records, cpu, start);
}
}
int64_t vcpu_calculate_dirtyrate(int64_t calc_time_ms,
VcpuStat *stat,
unsigned int flag,
bool one_shot)
{
DirtyPageRecord *records;
int64_t init_time_ms;
int64_t duration;
int64_t dirtyrate;
int i = 0;
unsigned int gen_id;
retry:
init_time_ms = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
WITH_QEMU_LOCK_GUARD(&qemu_cpu_list_lock) {
gen_id = cpu_list_generation_id_get();
records = vcpu_dirty_stat_alloc(stat);
vcpu_dirty_stat_collect(stat, records, true);
}
duration = dirty_stat_wait(calc_time_ms, init_time_ms);
global_dirty_log_sync(flag, one_shot);
WITH_QEMU_LOCK_GUARD(&qemu_cpu_list_lock) {
if (gen_id != cpu_list_generation_id_get()) {
g_free(records);
g_free(stat->rates);
cpu_list_unlock();
goto retry;
}
vcpu_dirty_stat_collect(stat, records, false);
}
for (i = 0; i < stat->nvcpu; i++) {
dirtyrate = do_calculate_dirtyrate(records[i], duration);
stat->rates[i].id = i;
stat->rates[i].dirty_rate = dirtyrate;
trace_dirtyrate_do_calculate_vcpu(i, dirtyrate);
}
g_free(records);
return duration;
}
static bool is_sample_period_valid(int64_t sec)
{
if (sec < MIN_FETCH_DIRTYRATE_TIME_SEC ||
sec > MAX_FETCH_DIRTYRATE_TIME_SEC) {
return false;
}
return true;
}
static bool is_sample_pages_valid(int64_t pages)
{
return pages >= MIN_SAMPLE_PAGE_COUNT &&
pages <= MAX_SAMPLE_PAGE_COUNT;
}
static int dirtyrate_set_state(int *state, int old_state, int new_state)
{
assert(new_state < DIRTY_RATE_STATUS__MAX);
trace_dirtyrate_set_state(DirtyRateStatus_str(new_state));
if (qatomic_cmpxchg(state, old_state, new_state) == old_state) {
return 0;
} else {
return -1;
}
}
static struct DirtyRateInfo *query_dirty_rate_info(void)
{
int i;
int64_t dirty_rate = DirtyStat.dirty_rate;
struct DirtyRateInfo *info = g_new0(DirtyRateInfo, 1);
DirtyRateVcpuList *head = NULL, **tail = &head;
info->status = CalculatingState;
info->start_time = DirtyStat.start_time;
info->calc_time = DirtyStat.calc_time;
info->sample_pages = DirtyStat.sample_pages;
info->mode = dirtyrate_mode;
if (qatomic_read(&CalculatingState) == DIRTY_RATE_STATUS_MEASURED) {
info->has_dirty_rate = true;
info->dirty_rate = dirty_rate;
if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) {
/*
* set sample_pages with 0 to indicate page sampling
* isn't enabled
**/
info->sample_pages = 0;
info->has_vcpu_dirty_rate = true;
for (i = 0; i < DirtyStat.dirty_ring.nvcpu; i++) {
DirtyRateVcpu *rate = g_new0(DirtyRateVcpu, 1);
rate->id = DirtyStat.dirty_ring.rates[i].id;
rate->dirty_rate = DirtyStat.dirty_ring.rates[i].dirty_rate;
QAPI_LIST_APPEND(tail, rate);
}
info->vcpu_dirty_rate = head;
}
if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) {
info->sample_pages = 0;
}
}
trace_query_dirty_rate_info(DirtyRateStatus_str(CalculatingState));
return info;
}
static void init_dirtyrate_stat(int64_t start_time,
struct DirtyRateConfig config)
{
DirtyStat.dirty_rate = -1;
DirtyStat.start_time = start_time;
DirtyStat.calc_time = config.sample_period_seconds;
DirtyStat.sample_pages = config.sample_pages_per_gigabytes;
switch (config.mode) {
case DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING:
DirtyStat.page_sampling.total_dirty_samples = 0;
DirtyStat.page_sampling.total_sample_count = 0;
DirtyStat.page_sampling.total_block_mem_MB = 0;
break;
case DIRTY_RATE_MEASURE_MODE_DIRTY_RING:
DirtyStat.dirty_ring.nvcpu = -1;
DirtyStat.dirty_ring.rates = NULL;
break;
default:
break;
}
}
static void cleanup_dirtyrate_stat(struct DirtyRateConfig config)
{
/* last calc-dirty-rate qmp use dirty ring mode */
if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) {
free(DirtyStat.dirty_ring.rates);
DirtyStat.dirty_ring.rates = NULL;
}
}
static void update_dirtyrate_stat(struct RamblockDirtyInfo *info)
{
DirtyStat.page_sampling.total_dirty_samples += info->sample_dirty_count;
DirtyStat.page_sampling.total_sample_count += info->sample_pages_count;
/* size of total pages in MB */
DirtyStat.page_sampling.total_block_mem_MB +=
qemu_target_pages_to_MiB(info->ramblock_pages);
}
static void update_dirtyrate(uint64_t msec)
{
uint64_t dirtyrate;
uint64_t total_dirty_samples = DirtyStat.page_sampling.total_dirty_samples;
uint64_t total_sample_count = DirtyStat.page_sampling.total_sample_count;
uint64_t total_block_mem_MB = DirtyStat.page_sampling.total_block_mem_MB;
dirtyrate = total_dirty_samples * total_block_mem_MB *
1000 / (total_sample_count * msec);
DirtyStat.dirty_rate = dirtyrate;
}
/*
* Compute hash of a single page of size TARGET_PAGE_SIZE.
*/
static uint32_t compute_page_hash(void *ptr)
{
size_t page_size = qemu_target_page_size();
uint32_t i;
uint64_t v1, v2, v3, v4;
uint64_t res;
const uint64_t *p = ptr;
v1 = QEMU_XXHASH_SEED + XXH_PRIME64_1 + XXH_PRIME64_2;
v2 = QEMU_XXHASH_SEED + XXH_PRIME64_2;
v3 = QEMU_XXHASH_SEED + 0;
v4 = QEMU_XXHASH_SEED - XXH_PRIME64_1;
for (i = 0; i < page_size / 8; i += 4) {
v1 = XXH64_round(v1, p[i + 0]);
v2 = XXH64_round(v2, p[i + 1]);
v3 = XXH64_round(v3, p[i + 2]);
v4 = XXH64_round(v4, p[i + 3]);
}
res = XXH64_mergerounds(v1, v2, v3, v4);
res += page_size;
res = XXH64_avalanche(res);
return (uint32_t)(res & UINT32_MAX);
}
/*
* get hash result for the sampled memory with length of TARGET_PAGE_SIZE
* in ramblock, which starts from ramblock base address.
*/
static uint32_t get_ramblock_vfn_hash(struct RamblockDirtyInfo *info,
uint64_t vfn)
{
uint32_t hash;
hash = compute_page_hash(info->ramblock_addr +
vfn * qemu_target_page_size());
trace_get_ramblock_vfn_hash(info->idstr, vfn, hash);
return hash;
}
static bool save_ramblock_hash(struct RamblockDirtyInfo *info)
{
unsigned int sample_pages_count;
int i;
GRand *rand;
sample_pages_count = info->sample_pages_count;
/* ramblock size less than one page, return success to skip this ramblock */
if (unlikely(info->ramblock_pages == 0 || sample_pages_count == 0)) {
return true;
}
info->hash_result = g_try_malloc0_n(sample_pages_count,
sizeof(uint32_t));
if (!info->hash_result) {
return false;
}
info->sample_page_vfn = g_try_malloc0_n(sample_pages_count,
sizeof(uint64_t));
if (!info->sample_page_vfn) {
g_free(info->hash_result);
return false;
}
rand = g_rand_new();
for (i = 0; i < sample_pages_count; i++) {
info->sample_page_vfn[i] = g_rand_int_range(rand, 0,
info->ramblock_pages - 1);
info->hash_result[i] = get_ramblock_vfn_hash(info,
info->sample_page_vfn[i]);
}
g_rand_free(rand);
return true;
}
static void get_ramblock_dirty_info(RAMBlock *block,
struct RamblockDirtyInfo *info,
struct DirtyRateConfig *config)
{
uint64_t sample_pages_per_gigabytes = config->sample_pages_per_gigabytes;
/* Right shift 30 bits to calc ramblock size in GB */
info->sample_pages_count = (qemu_ram_get_used_length(block) *
sample_pages_per_gigabytes) >> 30;
/* Right shift TARGET_PAGE_BITS to calc page count */
info->ramblock_pages = qemu_ram_get_used_length(block) >>
qemu_target_page_bits();
info->ramblock_addr = qemu_ram_get_host_addr(block);
strcpy(info->idstr, qemu_ram_get_idstr(block));
}
static void free_ramblock_dirty_info(struct RamblockDirtyInfo *infos, int count)
{
int i;
if (!infos) {
return;
}
for (i = 0; i < count; i++) {
g_free(infos[i].sample_page_vfn);
g_free(infos[i].hash_result);
}
g_free(infos);
}
static bool skip_sample_ramblock(RAMBlock *block)
{
/*
* Sample only blocks larger than MIN_RAMBLOCK_SIZE.
*/
if (qemu_ram_get_used_length(block) < (MIN_RAMBLOCK_SIZE << 10)) {
trace_skip_sample_ramblock(block->idstr,
qemu_ram_get_used_length(block));
return true;
}
return false;
}
static bool record_ramblock_hash_info(struct RamblockDirtyInfo **block_dinfo,
struct DirtyRateConfig config,
int *block_count)
{
struct RamblockDirtyInfo *info = NULL;
struct RamblockDirtyInfo *dinfo = NULL;
RAMBlock *block = NULL;
int total_count = 0;
int index = 0;
bool ret = false;
RAMBLOCK_FOREACH_MIGRATABLE(block) {
if (skip_sample_ramblock(block)) {
continue;
}
total_count++;
}
dinfo = g_try_malloc0_n(total_count, sizeof(struct RamblockDirtyInfo));
if (dinfo == NULL) {
goto out;
}
RAMBLOCK_FOREACH_MIGRATABLE(block) {
if (skip_sample_ramblock(block)) {
continue;
}
if (index >= total_count) {
break;
}
info = &dinfo[index];
get_ramblock_dirty_info(block, info, &config);
if (!save_ramblock_hash(info)) {
goto out;
}
index++;
}
ret = true;
out:
*block_count = index;
*block_dinfo = dinfo;
return ret;
}
static void calc_page_dirty_rate(struct RamblockDirtyInfo *info)
{
uint32_t hash;
int i;
for (i = 0; i < info->sample_pages_count; i++) {
hash = get_ramblock_vfn_hash(info, info->sample_page_vfn[i]);
if (hash != info->hash_result[i]) {
trace_calc_page_dirty_rate(info->idstr, hash, info->hash_result[i]);
info->sample_dirty_count++;
}
}
}
static struct RamblockDirtyInfo *
find_block_matched(RAMBlock *block, int count,
struct RamblockDirtyInfo *infos)
{
int i;
for (i = 0; i < count; i++) {
if (!strcmp(infos[i].idstr, qemu_ram_get_idstr(block))) {
break;
}
}
if (i == count) {
return NULL;
}
if (infos[i].ramblock_addr != qemu_ram_get_host_addr(block) ||
infos[i].ramblock_pages !=
(qemu_ram_get_used_length(block) >> qemu_target_page_bits())) {
trace_find_page_matched(block->idstr);
return NULL;
}
return &infos[i];
}
static bool compare_page_hash_info(struct RamblockDirtyInfo *info,
int block_count)
{
struct RamblockDirtyInfo *block_dinfo = NULL;
RAMBlock *block = NULL;
RAMBLOCK_FOREACH_MIGRATABLE(block) {
if (skip_sample_ramblock(block)) {
continue;
}
block_dinfo = find_block_matched(block, block_count, info);
if (block_dinfo == NULL) {
continue;
}
calc_page_dirty_rate(block_dinfo);
update_dirtyrate_stat(block_dinfo);
}
if (DirtyStat.page_sampling.total_sample_count == 0) {
return false;
}
return true;
}
static inline void record_dirtypages_bitmap(DirtyPageRecord *dirty_pages,
bool start)
{
if (start) {
dirty_pages->start_pages = total_dirty_pages;
} else {
dirty_pages->end_pages = total_dirty_pages;
}
}
static inline void dirtyrate_manual_reset_protect(void)
{
RAMBlock *block = NULL;
WITH_RCU_READ_LOCK_GUARD() {
RAMBLOCK_FOREACH_MIGRATABLE(block) {
memory_region_clear_dirty_bitmap(block->mr, 0,
block->used_length);
}
}
}
static void calculate_dirtyrate_dirty_bitmap(struct DirtyRateConfig config)
{
int64_t msec = 0;
int64_t start_time;
DirtyPageRecord dirty_pages;
qemu_mutex_lock_iothread();
memory_global_dirty_log_start(GLOBAL_DIRTY_DIRTY_RATE);
/*
* 1'round of log sync may return all 1 bits with
* KVM_DIRTY_LOG_INITIALLY_SET enable
* skip it unconditionally and start dirty tracking
* from 2'round of log sync
*/
memory_global_dirty_log_sync(false);
/*
* reset page protect manually and unconditionally.
* this make sure kvm dirty log be cleared if
* KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE cap is enabled.
*/
dirtyrate_manual_reset_protect();
qemu_mutex_unlock_iothread();
record_dirtypages_bitmap(&dirty_pages, true);
start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
DirtyStat.start_time = start_time / 1000;
msec = config.sample_period_seconds * 1000;
msec = dirty_stat_wait(msec, start_time);
DirtyStat.calc_time = msec / 1000;
/*
* do two things.
* 1. fetch dirty bitmap from kvm
* 2. stop dirty tracking
*/
global_dirty_log_sync(GLOBAL_DIRTY_DIRTY_RATE, true);
record_dirtypages_bitmap(&dirty_pages, false);
DirtyStat.dirty_rate = do_calculate_dirtyrate(dirty_pages, msec);
}
static void calculate_dirtyrate_dirty_ring(struct DirtyRateConfig config)
{
int64_t duration;
uint64_t dirtyrate = 0;
uint64_t dirtyrate_sum = 0;
int i = 0;
/* start log sync */
global_dirty_log_change(GLOBAL_DIRTY_DIRTY_RATE, true);
DirtyStat.start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) / 1000;
/* calculate vcpu dirtyrate */
duration = vcpu_calculate_dirtyrate(config.sample_period_seconds * 1000,
&DirtyStat.dirty_ring,
GLOBAL_DIRTY_DIRTY_RATE,
true);
DirtyStat.calc_time = duration / 1000;
/* calculate vm dirtyrate */
for (i = 0; i < DirtyStat.dirty_ring.nvcpu; i++) {
dirtyrate = DirtyStat.dirty_ring.rates[i].dirty_rate;
DirtyStat.dirty_ring.rates[i].dirty_rate = dirtyrate;
dirtyrate_sum += dirtyrate;
}
DirtyStat.dirty_rate = dirtyrate_sum;
}
static void calculate_dirtyrate_sample_vm(struct DirtyRateConfig config)
{
struct RamblockDirtyInfo *block_dinfo = NULL;
int block_count = 0;
int64_t msec = 0;
int64_t initial_time;
rcu_read_lock();
initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
if (!record_ramblock_hash_info(&block_dinfo, config, &block_count)) {
goto out;
}
rcu_read_unlock();
msec = config.sample_period_seconds * 1000;
msec = dirty_stat_wait(msec, initial_time);
DirtyStat.start_time = initial_time / 1000;
DirtyStat.calc_time = msec / 1000;
rcu_read_lock();
if (!compare_page_hash_info(block_dinfo, block_count)) {
goto out;
}
update_dirtyrate(msec);
out:
rcu_read_unlock();
free_ramblock_dirty_info(block_dinfo, block_count);
}
static void calculate_dirtyrate(struct DirtyRateConfig config)
{
if (config.mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) {
calculate_dirtyrate_dirty_bitmap(config);
} else if (config.mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) {
calculate_dirtyrate_dirty_ring(config);
} else {
calculate_dirtyrate_sample_vm(config);
}
trace_dirtyrate_calculate(DirtyStat.dirty_rate);
}
void *get_dirtyrate_thread(void *arg)
{
struct DirtyRateConfig config = *(struct DirtyRateConfig *)arg;
int ret;
rcu_register_thread();
ret = dirtyrate_set_state(&CalculatingState, DIRTY_RATE_STATUS_UNSTARTED,
DIRTY_RATE_STATUS_MEASURING);
if (ret == -1) {
error_report("change dirtyrate state failed.");
return NULL;
}
calculate_dirtyrate(config);
ret = dirtyrate_set_state(&CalculatingState, DIRTY_RATE_STATUS_MEASURING,
DIRTY_RATE_STATUS_MEASURED);
if (ret == -1) {
error_report("change dirtyrate state failed.");
}
rcu_unregister_thread();
return NULL;
}
void qmp_calc_dirty_rate(int64_t calc_time,
bool has_sample_pages,
int64_t sample_pages,
bool has_mode,
DirtyRateMeasureMode mode,
Error **errp)
{
static struct DirtyRateConfig config;
QemuThread thread;
int ret;
int64_t start_time;
/*
* If the dirty rate is already being measured, don't attempt to start.
*/
if (qatomic_read(&CalculatingState) == DIRTY_RATE_STATUS_MEASURING) {
error_setg(errp, "the dirty rate is already being measured.");
return;
}
if (!is_sample_period_valid(calc_time)) {
error_setg(errp, "calc-time is out of range[%d, %d].",
MIN_FETCH_DIRTYRATE_TIME_SEC,
MAX_FETCH_DIRTYRATE_TIME_SEC);
return;
}
if (!has_mode) {
mode = DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING;
}
if (has_sample_pages && mode != DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING) {
error_setg(errp, "sample-pages is used only in page-sampling mode");
return;
}
if (has_sample_pages) {
if (!is_sample_pages_valid(sample_pages)) {
error_setg(errp, "sample-pages is out of range[%d, %d].",
MIN_SAMPLE_PAGE_COUNT,
MAX_SAMPLE_PAGE_COUNT);
return;
}
} else {
sample_pages = DIRTYRATE_DEFAULT_SAMPLE_PAGES;
}
/*
* dirty ring mode only works when kvm dirty ring is enabled.
* on the contrary, dirty bitmap mode is not.
*/
if (((mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) &&
!kvm_dirty_ring_enabled()) ||
((mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) &&
kvm_dirty_ring_enabled())) {
error_setg(errp, "mode %s is not enabled, use other method instead.",
DirtyRateMeasureMode_str(mode));
return;
}
/*
* Init calculation state as unstarted.
*/
ret = dirtyrate_set_state(&CalculatingState, CalculatingState,
DIRTY_RATE_STATUS_UNSTARTED);
if (ret == -1) {
error_setg(errp, "init dirty rate calculation state failed.");
return;
}
config.sample_period_seconds = calc_time;
config.sample_pages_per_gigabytes = sample_pages;
config.mode = mode;
cleanup_dirtyrate_stat(config);
/*
* update dirty rate mode so that we can figure out what mode has
* been used in last calculation
**/
dirtyrate_mode = mode;
start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) / 1000;
init_dirtyrate_stat(start_time, config);
qemu_thread_create(&thread, "get_dirtyrate", get_dirtyrate_thread,
(void *)&config, QEMU_THREAD_DETACHED);
}
struct DirtyRateInfo *qmp_query_dirty_rate(Error **errp)
{
return query_dirty_rate_info();
}
void hmp_info_dirty_rate(Monitor *mon, const QDict *qdict)
{
DirtyRateInfo *info = query_dirty_rate_info();
monitor_printf(mon, "Status: %s\n",
DirtyRateStatus_str(info->status));
monitor_printf(mon, "Start Time: %"PRIi64" (ms)\n",
info->start_time);
if (info->mode == DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING) {
monitor_printf(mon, "Sample Pages: %"PRIu64" (per GB)\n",
info->sample_pages);
}
monitor_printf(mon, "Period: %"PRIi64" (sec)\n",
info->calc_time);
monitor_printf(mon, "Mode: %s\n",
DirtyRateMeasureMode_str(info->mode));
monitor_printf(mon, "Dirty rate: ");
if (info->has_dirty_rate) {
monitor_printf(mon, "%"PRIi64" (MB/s)\n", info->dirty_rate);
if (info->has_vcpu_dirty_rate) {
DirtyRateVcpuList *rate, *head = info->vcpu_dirty_rate;
for (rate = head; rate != NULL; rate = rate->next) {
monitor_printf(mon, "vcpu[%"PRIi64"], Dirty rate: %"PRIi64
" (MB/s)\n", rate->value->id,
rate->value->dirty_rate);
}
}
} else {
monitor_printf(mon, "(not ready)\n");
}
qapi_free_DirtyRateVcpuList(info->vcpu_dirty_rate);
g_free(info);
}
void hmp_calc_dirty_rate(Monitor *mon, const QDict *qdict)
{
int64_t sec = qdict_get_try_int(qdict, "second", 0);
int64_t sample_pages = qdict_get_try_int(qdict, "sample_pages_per_GB", -1);
bool has_sample_pages = (sample_pages != -1);
bool dirty_ring = qdict_get_try_bool(qdict, "dirty_ring", false);
bool dirty_bitmap = qdict_get_try_bool(qdict, "dirty_bitmap", false);
DirtyRateMeasureMode mode = DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING;
Error *err = NULL;
if (!sec) {
monitor_printf(mon, "Incorrect period length specified!\n");
return;
}
if (dirty_ring && dirty_bitmap) {
monitor_printf(mon, "Either dirty ring or dirty bitmap "
"can be specified!\n");
return;
}
if (dirty_bitmap) {
mode = DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP;
} else if (dirty_ring) {
mode = DIRTY_RATE_MEASURE_MODE_DIRTY_RING;
}
qmp_calc_dirty_rate(sec, has_sample_pages, sample_pages, true,
mode, &err);
if (err) {
hmp_handle_error(mon, err);
return;
}
monitor_printf(mon, "Starting dirty rate measurement with period %"PRIi64
" seconds\n", sec);
monitor_printf(mon, "[Please use 'info dirty_rate' to check results]\n");
}
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