/* * Dirtyrate implement code * * Copyright (c) 2020 HUAWEI TECHNOLOGIES CO.,LTD. * * Authors: * Chuan Zheng * * 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 "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); /* g_usleep may overshoot */ msec = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - initial_time; } 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; /* * multiply by 1000ms/s _before_ converting down to megabytes * to avoid losing precision */ return qemu_target_pages_to_MiB(increased_dirty_pages * 1000) / calc_time_ms; } void global_dirty_log_change(unsigned int flag, bool start) { Error *local_err = NULL; bool ret; bql_lock(); if (start) { ret = memory_global_dirty_log_start(flag, &local_err); if (!ret) { error_report_err(local_err); } } else { memory_global_dirty_log_stop(flag); } bql_unlock(); } /* * 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) { bql_lock(); memory_global_dirty_log_sync(false); if (one_shot) { memory_global_dirty_log_stop(flag); } bql_unlock(); } 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(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 = NULL; int64_t init_time_ms; int64_t duration; int64_t dirtyrate; int i = 0; unsigned int gen_id = 0; 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(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(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_calc_time_valid(int64_t msec) { if ((msec < MIN_CALC_TIME_MS) || (msec > MAX_CALC_TIME_MS)) { 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; } } /* Decimal power of given time unit relative to one second */ static int time_unit_to_power(TimeUnit time_unit) { switch (time_unit) { case TIME_UNIT_SECOND: return 0; case TIME_UNIT_MILLISECOND: return -3; default: g_assert_not_reached(); } } static int64_t convert_time_unit(int64_t value, TimeUnit unit_from, TimeUnit unit_to) { int power = time_unit_to_power(unit_from) - time_unit_to_power(unit_to); while (power < 0) { value /= 10; power += 1; } while (power > 0) { value *= 10; power -= 1; } return value; } static struct DirtyRateInfo * query_dirty_rate_info(TimeUnit calc_time_unit) { 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 = convert_time_unit(DirtyStat.calc_time_ms, TIME_UNIT_MILLISECOND, calc_time_unit); info->calc_time_unit = calc_time_unit; 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(struct DirtyRateConfig config) { DirtyStat.dirty_rate = -1; DirtyStat.start_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) / 1000; DirtyStat.calc_time_ms = config.calc_time_ms; 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 start_time; DirtyPageRecord dirty_pages; Error *local_err = NULL; bql_lock(); if (!memory_global_dirty_log_start(GLOBAL_DIRTY_DIRTY_RATE, &local_err)) { error_report_err(local_err); } /* * 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(); bql_unlock(); record_dirtypages_bitmap(&dirty_pages, true); start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); DirtyStat.start_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) / 1000; DirtyStat.calc_time_ms = dirty_stat_wait(config.calc_time_ms, start_time); /* * 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, DirtyStat.calc_time_ms); } static void calculate_dirtyrate_dirty_ring(struct DirtyRateConfig config) { 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_HOST) / 1000; /* calculate vcpu dirtyrate */ DirtyStat.calc_time_ms = vcpu_calculate_dirtyrate(config.calc_time_ms, &DirtyStat.dirty_ring, GLOBAL_DIRTY_DIRTY_RATE, true); /* 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 initial_time; rcu_read_lock(); initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); DirtyStat.start_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) / 1000; if (!record_ramblock_hash_info(&block_dinfo, config, &block_count)) { goto out; } rcu_read_unlock(); DirtyStat.calc_time_ms = dirty_stat_wait(config.calc_time_ms, initial_time); rcu_read_lock(); if (!compare_page_hash_info(block_dinfo, block_count)) { goto out; } update_dirtyrate(DirtyStat.calc_time_ms); 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_calc_time_unit, TimeUnit calc_time_unit, bool has_sample_pages, int64_t sample_pages, bool has_mode, DirtyRateMeasureMode mode, Error **errp) { static struct DirtyRateConfig config; QemuThread thread; int ret; /* * 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; } int64_t calc_time_ms = convert_time_unit( calc_time, has_calc_time_unit ? calc_time_unit : TIME_UNIT_SECOND, TIME_UNIT_MILLISECOND ); if (!is_calc_time_valid(calc_time_ms)) { error_setg(errp, "Calculation time is out of range [%dms, %dms].", MIN_CALC_TIME_MS, MAX_CALC_TIME_MS); 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.calc_time_ms = calc_time_ms; 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; init_dirtyrate_stat(config); qemu_thread_create(&thread, "get_dirtyrate", get_dirtyrate_thread, (void *)&config, QEMU_THREAD_DETACHED); } struct DirtyRateInfo *qmp_query_dirty_rate(bool has_calc_time_unit, TimeUnit calc_time_unit, Error **errp) { return query_dirty_rate_info( has_calc_time_unit ? calc_time_unit : TIME_UNIT_SECOND); } void hmp_info_dirty_rate(Monitor *mon, const QDict *qdict) { DirtyRateInfo *info = query_dirty_rate_info(TIME_UNIT_SECOND); 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, /* calc-time */ false, TIME_UNIT_SECOND, /* calc-time-unit */ 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"); }