| /* |
| * 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 "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"); |
| } |
