1 /* 2 * Dirtyrate implement code 3 * 4 * Copyright (c) 2020 HUAWEI TECHNOLOGIES CO.,LTD. 5 * 6 * Authors: 7 * Chuan Zheng <zhengchuan@huawei.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or later. 10 * See the COPYING file in the top-level directory. 11 */ 12 13 #include "qemu/osdep.h" 14 #include <zlib.h> 15 #include "qapi/error.h" 16 #include "cpu.h" 17 #include "exec/ramblock.h" 18 #include "exec/ram_addr.h" 19 #include "qemu/rcu_queue.h" 20 #include "qemu/main-loop.h" 21 #include "qapi/qapi-commands-migration.h" 22 #include "ram.h" 23 #include "trace.h" 24 #include "dirtyrate.h" 25 #include "monitor/hmp.h" 26 #include "monitor/monitor.h" 27 #include "qapi/qmp/qdict.h" 28 #include "sysemu/kvm.h" 29 #include "sysemu/runstate.h" 30 #include "exec/memory.h" 31 32 /* 33 * total_dirty_pages is procted by BQL and is used 34 * to stat dirty pages during the period of two 35 * memory_global_dirty_log_sync 36 */ 37 uint64_t total_dirty_pages; 38 39 typedef struct DirtyPageRecord { 40 uint64_t start_pages; 41 uint64_t end_pages; 42 } DirtyPageRecord; 43 44 static int CalculatingState = DIRTY_RATE_STATUS_UNSTARTED; 45 static struct DirtyRateStat DirtyStat; 46 static DirtyRateMeasureMode dirtyrate_mode = 47 DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING; 48 49 static int64_t set_sample_page_period(int64_t msec, int64_t initial_time) 50 { 51 int64_t current_time; 52 53 current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 54 if ((current_time - initial_time) >= msec) { 55 msec = current_time - initial_time; 56 } else { 57 g_usleep((msec + initial_time - current_time) * 1000); 58 } 59 60 return msec; 61 } 62 63 static bool is_sample_period_valid(int64_t sec) 64 { 65 if (sec < MIN_FETCH_DIRTYRATE_TIME_SEC || 66 sec > MAX_FETCH_DIRTYRATE_TIME_SEC) { 67 return false; 68 } 69 70 return true; 71 } 72 73 static bool is_sample_pages_valid(int64_t pages) 74 { 75 return pages >= MIN_SAMPLE_PAGE_COUNT && 76 pages <= MAX_SAMPLE_PAGE_COUNT; 77 } 78 79 static int dirtyrate_set_state(int *state, int old_state, int new_state) 80 { 81 assert(new_state < DIRTY_RATE_STATUS__MAX); 82 trace_dirtyrate_set_state(DirtyRateStatus_str(new_state)); 83 if (qatomic_cmpxchg(state, old_state, new_state) == old_state) { 84 return 0; 85 } else { 86 return -1; 87 } 88 } 89 90 static struct DirtyRateInfo *query_dirty_rate_info(void) 91 { 92 int i; 93 int64_t dirty_rate = DirtyStat.dirty_rate; 94 struct DirtyRateInfo *info = g_new0(DirtyRateInfo, 1); 95 DirtyRateVcpuList *head = NULL, **tail = &head; 96 97 info->status = CalculatingState; 98 info->start_time = DirtyStat.start_time; 99 info->calc_time = DirtyStat.calc_time; 100 info->sample_pages = DirtyStat.sample_pages; 101 info->mode = dirtyrate_mode; 102 103 if (qatomic_read(&CalculatingState) == DIRTY_RATE_STATUS_MEASURED) { 104 info->has_dirty_rate = true; 105 info->dirty_rate = dirty_rate; 106 107 if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) { 108 /* 109 * set sample_pages with 0 to indicate page sampling 110 * isn't enabled 111 **/ 112 info->sample_pages = 0; 113 info->has_vcpu_dirty_rate = true; 114 for (i = 0; i < DirtyStat.dirty_ring.nvcpu; i++) { 115 DirtyRateVcpu *rate = g_new0(DirtyRateVcpu, 1); 116 rate->id = DirtyStat.dirty_ring.rates[i].id; 117 rate->dirty_rate = DirtyStat.dirty_ring.rates[i].dirty_rate; 118 QAPI_LIST_APPEND(tail, rate); 119 } 120 info->vcpu_dirty_rate = head; 121 } 122 123 if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) { 124 info->sample_pages = 0; 125 } 126 } 127 128 trace_query_dirty_rate_info(DirtyRateStatus_str(CalculatingState)); 129 130 return info; 131 } 132 133 static void init_dirtyrate_stat(int64_t start_time, 134 struct DirtyRateConfig config) 135 { 136 DirtyStat.dirty_rate = -1; 137 DirtyStat.start_time = start_time; 138 DirtyStat.calc_time = config.sample_period_seconds; 139 DirtyStat.sample_pages = config.sample_pages_per_gigabytes; 140 141 switch (config.mode) { 142 case DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING: 143 DirtyStat.page_sampling.total_dirty_samples = 0; 144 DirtyStat.page_sampling.total_sample_count = 0; 145 DirtyStat.page_sampling.total_block_mem_MB = 0; 146 break; 147 case DIRTY_RATE_MEASURE_MODE_DIRTY_RING: 148 DirtyStat.dirty_ring.nvcpu = -1; 149 DirtyStat.dirty_ring.rates = NULL; 150 break; 151 default: 152 break; 153 } 154 } 155 156 static void cleanup_dirtyrate_stat(struct DirtyRateConfig config) 157 { 158 /* last calc-dirty-rate qmp use dirty ring mode */ 159 if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) { 160 free(DirtyStat.dirty_ring.rates); 161 DirtyStat.dirty_ring.rates = NULL; 162 } 163 } 164 165 static void update_dirtyrate_stat(struct RamblockDirtyInfo *info) 166 { 167 DirtyStat.page_sampling.total_dirty_samples += info->sample_dirty_count; 168 DirtyStat.page_sampling.total_sample_count += info->sample_pages_count; 169 /* size of total pages in MB */ 170 DirtyStat.page_sampling.total_block_mem_MB += (info->ramblock_pages * 171 TARGET_PAGE_SIZE) >> 20; 172 } 173 174 static void update_dirtyrate(uint64_t msec) 175 { 176 uint64_t dirtyrate; 177 uint64_t total_dirty_samples = DirtyStat.page_sampling.total_dirty_samples; 178 uint64_t total_sample_count = DirtyStat.page_sampling.total_sample_count; 179 uint64_t total_block_mem_MB = DirtyStat.page_sampling.total_block_mem_MB; 180 181 dirtyrate = total_dirty_samples * total_block_mem_MB * 182 1000 / (total_sample_count * msec); 183 184 DirtyStat.dirty_rate = dirtyrate; 185 } 186 187 /* 188 * get hash result for the sampled memory with length of TARGET_PAGE_SIZE 189 * in ramblock, which starts from ramblock base address. 190 */ 191 static uint32_t get_ramblock_vfn_hash(struct RamblockDirtyInfo *info, 192 uint64_t vfn) 193 { 194 uint32_t crc; 195 196 crc = crc32(0, (info->ramblock_addr + 197 vfn * TARGET_PAGE_SIZE), TARGET_PAGE_SIZE); 198 199 trace_get_ramblock_vfn_hash(info->idstr, vfn, crc); 200 return crc; 201 } 202 203 static bool save_ramblock_hash(struct RamblockDirtyInfo *info) 204 { 205 unsigned int sample_pages_count; 206 int i; 207 GRand *rand; 208 209 sample_pages_count = info->sample_pages_count; 210 211 /* ramblock size less than one page, return success to skip this ramblock */ 212 if (unlikely(info->ramblock_pages == 0 || sample_pages_count == 0)) { 213 return true; 214 } 215 216 info->hash_result = g_try_malloc0_n(sample_pages_count, 217 sizeof(uint32_t)); 218 if (!info->hash_result) { 219 return false; 220 } 221 222 info->sample_page_vfn = g_try_malloc0_n(sample_pages_count, 223 sizeof(uint64_t)); 224 if (!info->sample_page_vfn) { 225 g_free(info->hash_result); 226 return false; 227 } 228 229 rand = g_rand_new(); 230 for (i = 0; i < sample_pages_count; i++) { 231 info->sample_page_vfn[i] = g_rand_int_range(rand, 0, 232 info->ramblock_pages - 1); 233 info->hash_result[i] = get_ramblock_vfn_hash(info, 234 info->sample_page_vfn[i]); 235 } 236 g_rand_free(rand); 237 238 return true; 239 } 240 241 static void get_ramblock_dirty_info(RAMBlock *block, 242 struct RamblockDirtyInfo *info, 243 struct DirtyRateConfig *config) 244 { 245 uint64_t sample_pages_per_gigabytes = config->sample_pages_per_gigabytes; 246 247 /* Right shift 30 bits to calc ramblock size in GB */ 248 info->sample_pages_count = (qemu_ram_get_used_length(block) * 249 sample_pages_per_gigabytes) >> 30; 250 /* Right shift TARGET_PAGE_BITS to calc page count */ 251 info->ramblock_pages = qemu_ram_get_used_length(block) >> 252 TARGET_PAGE_BITS; 253 info->ramblock_addr = qemu_ram_get_host_addr(block); 254 strcpy(info->idstr, qemu_ram_get_idstr(block)); 255 } 256 257 static void free_ramblock_dirty_info(struct RamblockDirtyInfo *infos, int count) 258 { 259 int i; 260 261 if (!infos) { 262 return; 263 } 264 265 for (i = 0; i < count; i++) { 266 g_free(infos[i].sample_page_vfn); 267 g_free(infos[i].hash_result); 268 } 269 g_free(infos); 270 } 271 272 static bool skip_sample_ramblock(RAMBlock *block) 273 { 274 /* 275 * Sample only blocks larger than MIN_RAMBLOCK_SIZE. 276 */ 277 if (qemu_ram_get_used_length(block) < (MIN_RAMBLOCK_SIZE << 10)) { 278 trace_skip_sample_ramblock(block->idstr, 279 qemu_ram_get_used_length(block)); 280 return true; 281 } 282 283 return false; 284 } 285 286 static bool record_ramblock_hash_info(struct RamblockDirtyInfo **block_dinfo, 287 struct DirtyRateConfig config, 288 int *block_count) 289 { 290 struct RamblockDirtyInfo *info = NULL; 291 struct RamblockDirtyInfo *dinfo = NULL; 292 RAMBlock *block = NULL; 293 int total_count = 0; 294 int index = 0; 295 bool ret = false; 296 297 RAMBLOCK_FOREACH_MIGRATABLE(block) { 298 if (skip_sample_ramblock(block)) { 299 continue; 300 } 301 total_count++; 302 } 303 304 dinfo = g_try_malloc0_n(total_count, sizeof(struct RamblockDirtyInfo)); 305 if (dinfo == NULL) { 306 goto out; 307 } 308 309 RAMBLOCK_FOREACH_MIGRATABLE(block) { 310 if (skip_sample_ramblock(block)) { 311 continue; 312 } 313 if (index >= total_count) { 314 break; 315 } 316 info = &dinfo[index]; 317 get_ramblock_dirty_info(block, info, &config); 318 if (!save_ramblock_hash(info)) { 319 goto out; 320 } 321 index++; 322 } 323 ret = true; 324 325 out: 326 *block_count = index; 327 *block_dinfo = dinfo; 328 return ret; 329 } 330 331 static void calc_page_dirty_rate(struct RamblockDirtyInfo *info) 332 { 333 uint32_t crc; 334 int i; 335 336 for (i = 0; i < info->sample_pages_count; i++) { 337 crc = get_ramblock_vfn_hash(info, info->sample_page_vfn[i]); 338 if (crc != info->hash_result[i]) { 339 trace_calc_page_dirty_rate(info->idstr, crc, info->hash_result[i]); 340 info->sample_dirty_count++; 341 } 342 } 343 } 344 345 static struct RamblockDirtyInfo * 346 find_block_matched(RAMBlock *block, int count, 347 struct RamblockDirtyInfo *infos) 348 { 349 int i; 350 struct RamblockDirtyInfo *matched; 351 352 for (i = 0; i < count; i++) { 353 if (!strcmp(infos[i].idstr, qemu_ram_get_idstr(block))) { 354 break; 355 } 356 } 357 358 if (i == count) { 359 return NULL; 360 } 361 362 if (infos[i].ramblock_addr != qemu_ram_get_host_addr(block) || 363 infos[i].ramblock_pages != 364 (qemu_ram_get_used_length(block) >> TARGET_PAGE_BITS)) { 365 trace_find_page_matched(block->idstr); 366 return NULL; 367 } 368 369 matched = &infos[i]; 370 371 return matched; 372 } 373 374 static bool compare_page_hash_info(struct RamblockDirtyInfo *info, 375 int block_count) 376 { 377 struct RamblockDirtyInfo *block_dinfo = NULL; 378 RAMBlock *block = NULL; 379 380 RAMBLOCK_FOREACH_MIGRATABLE(block) { 381 if (skip_sample_ramblock(block)) { 382 continue; 383 } 384 block_dinfo = find_block_matched(block, block_count, info); 385 if (block_dinfo == NULL) { 386 continue; 387 } 388 calc_page_dirty_rate(block_dinfo); 389 update_dirtyrate_stat(block_dinfo); 390 } 391 392 if (DirtyStat.page_sampling.total_sample_count == 0) { 393 return false; 394 } 395 396 return true; 397 } 398 399 static inline void record_dirtypages(DirtyPageRecord *dirty_pages, 400 CPUState *cpu, bool start) 401 { 402 if (start) { 403 dirty_pages[cpu->cpu_index].start_pages = cpu->dirty_pages; 404 } else { 405 dirty_pages[cpu->cpu_index].end_pages = cpu->dirty_pages; 406 } 407 } 408 409 static void dirtyrate_global_dirty_log_start(void) 410 { 411 qemu_mutex_lock_iothread(); 412 memory_global_dirty_log_start(GLOBAL_DIRTY_DIRTY_RATE); 413 qemu_mutex_unlock_iothread(); 414 } 415 416 static void dirtyrate_global_dirty_log_stop(void) 417 { 418 qemu_mutex_lock_iothread(); 419 memory_global_dirty_log_sync(); 420 memory_global_dirty_log_stop(GLOBAL_DIRTY_DIRTY_RATE); 421 qemu_mutex_unlock_iothread(); 422 } 423 424 static int64_t do_calculate_dirtyrate_vcpu(DirtyPageRecord dirty_pages) 425 { 426 uint64_t memory_size_MB; 427 int64_t time_s; 428 uint64_t increased_dirty_pages = 429 dirty_pages.end_pages - dirty_pages.start_pages; 430 431 memory_size_MB = (increased_dirty_pages * TARGET_PAGE_SIZE) >> 20; 432 time_s = DirtyStat.calc_time; 433 434 return memory_size_MB / time_s; 435 } 436 437 static inline void record_dirtypages_bitmap(DirtyPageRecord *dirty_pages, 438 bool start) 439 { 440 if (start) { 441 dirty_pages->start_pages = total_dirty_pages; 442 } else { 443 dirty_pages->end_pages = total_dirty_pages; 444 } 445 } 446 447 static void do_calculate_dirtyrate_bitmap(DirtyPageRecord dirty_pages) 448 { 449 DirtyStat.dirty_rate = do_calculate_dirtyrate_vcpu(dirty_pages); 450 } 451 452 static inline void dirtyrate_manual_reset_protect(void) 453 { 454 RAMBlock *block = NULL; 455 456 WITH_RCU_READ_LOCK_GUARD() { 457 RAMBLOCK_FOREACH_MIGRATABLE(block) { 458 memory_region_clear_dirty_bitmap(block->mr, 0, 459 block->used_length); 460 } 461 } 462 } 463 464 static void calculate_dirtyrate_dirty_bitmap(struct DirtyRateConfig config) 465 { 466 int64_t msec = 0; 467 int64_t start_time; 468 DirtyPageRecord dirty_pages; 469 470 qemu_mutex_lock_iothread(); 471 memory_global_dirty_log_start(GLOBAL_DIRTY_DIRTY_RATE); 472 473 /* 474 * 1'round of log sync may return all 1 bits with 475 * KVM_DIRTY_LOG_INITIALLY_SET enable 476 * skip it unconditionally and start dirty tracking 477 * from 2'round of log sync 478 */ 479 memory_global_dirty_log_sync(); 480 481 /* 482 * reset page protect manually and unconditionally. 483 * this make sure kvm dirty log be cleared if 484 * KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE cap is enabled. 485 */ 486 dirtyrate_manual_reset_protect(); 487 qemu_mutex_unlock_iothread(); 488 489 record_dirtypages_bitmap(&dirty_pages, true); 490 491 start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 492 DirtyStat.start_time = start_time / 1000; 493 494 msec = config.sample_period_seconds * 1000; 495 msec = set_sample_page_period(msec, start_time); 496 DirtyStat.calc_time = msec / 1000; 497 498 /* 499 * dirtyrate_global_dirty_log_stop do two things. 500 * 1. fetch dirty bitmap from kvm 501 * 2. stop dirty tracking 502 */ 503 dirtyrate_global_dirty_log_stop(); 504 505 record_dirtypages_bitmap(&dirty_pages, false); 506 507 do_calculate_dirtyrate_bitmap(dirty_pages); 508 } 509 510 static void calculate_dirtyrate_dirty_ring(struct DirtyRateConfig config) 511 { 512 CPUState *cpu; 513 int64_t msec = 0; 514 int64_t start_time; 515 uint64_t dirtyrate = 0; 516 uint64_t dirtyrate_sum = 0; 517 DirtyPageRecord *dirty_pages; 518 int nvcpu = 0; 519 int i = 0; 520 521 CPU_FOREACH(cpu) { 522 nvcpu++; 523 } 524 525 dirty_pages = malloc(sizeof(*dirty_pages) * nvcpu); 526 527 DirtyStat.dirty_ring.nvcpu = nvcpu; 528 DirtyStat.dirty_ring.rates = malloc(sizeof(DirtyRateVcpu) * nvcpu); 529 530 dirtyrate_global_dirty_log_start(); 531 532 CPU_FOREACH(cpu) { 533 record_dirtypages(dirty_pages, cpu, true); 534 } 535 536 start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 537 DirtyStat.start_time = start_time / 1000; 538 539 msec = config.sample_period_seconds * 1000; 540 msec = set_sample_page_period(msec, start_time); 541 DirtyStat.calc_time = msec / 1000; 542 543 dirtyrate_global_dirty_log_stop(); 544 545 CPU_FOREACH(cpu) { 546 record_dirtypages(dirty_pages, cpu, false); 547 } 548 549 for (i = 0; i < DirtyStat.dirty_ring.nvcpu; i++) { 550 dirtyrate = do_calculate_dirtyrate_vcpu(dirty_pages[i]); 551 trace_dirtyrate_do_calculate_vcpu(i, dirtyrate); 552 553 DirtyStat.dirty_ring.rates[i].id = i; 554 DirtyStat.dirty_ring.rates[i].dirty_rate = dirtyrate; 555 dirtyrate_sum += dirtyrate; 556 } 557 558 DirtyStat.dirty_rate = dirtyrate_sum; 559 free(dirty_pages); 560 } 561 562 static void calculate_dirtyrate_sample_vm(struct DirtyRateConfig config) 563 { 564 struct RamblockDirtyInfo *block_dinfo = NULL; 565 int block_count = 0; 566 int64_t msec = 0; 567 int64_t initial_time; 568 569 rcu_read_lock(); 570 initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 571 if (!record_ramblock_hash_info(&block_dinfo, config, &block_count)) { 572 goto out; 573 } 574 rcu_read_unlock(); 575 576 msec = config.sample_period_seconds * 1000; 577 msec = set_sample_page_period(msec, initial_time); 578 DirtyStat.start_time = initial_time / 1000; 579 DirtyStat.calc_time = msec / 1000; 580 581 rcu_read_lock(); 582 if (!compare_page_hash_info(block_dinfo, block_count)) { 583 goto out; 584 } 585 586 update_dirtyrate(msec); 587 588 out: 589 rcu_read_unlock(); 590 free_ramblock_dirty_info(block_dinfo, block_count); 591 } 592 593 static void calculate_dirtyrate(struct DirtyRateConfig config) 594 { 595 if (config.mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) { 596 calculate_dirtyrate_dirty_bitmap(config); 597 } else if (config.mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) { 598 calculate_dirtyrate_dirty_ring(config); 599 } else { 600 calculate_dirtyrate_sample_vm(config); 601 } 602 603 trace_dirtyrate_calculate(DirtyStat.dirty_rate); 604 } 605 606 void *get_dirtyrate_thread(void *arg) 607 { 608 struct DirtyRateConfig config = *(struct DirtyRateConfig *)arg; 609 int ret; 610 rcu_register_thread(); 611 612 ret = dirtyrate_set_state(&CalculatingState, DIRTY_RATE_STATUS_UNSTARTED, 613 DIRTY_RATE_STATUS_MEASURING); 614 if (ret == -1) { 615 error_report("change dirtyrate state failed."); 616 return NULL; 617 } 618 619 calculate_dirtyrate(config); 620 621 ret = dirtyrate_set_state(&CalculatingState, DIRTY_RATE_STATUS_MEASURING, 622 DIRTY_RATE_STATUS_MEASURED); 623 if (ret == -1) { 624 error_report("change dirtyrate state failed."); 625 } 626 627 rcu_unregister_thread(); 628 return NULL; 629 } 630 631 void qmp_calc_dirty_rate(int64_t calc_time, 632 bool has_sample_pages, 633 int64_t sample_pages, 634 bool has_mode, 635 DirtyRateMeasureMode mode, 636 Error **errp) 637 { 638 static struct DirtyRateConfig config; 639 QemuThread thread; 640 int ret; 641 int64_t start_time; 642 643 /* 644 * If the dirty rate is already being measured, don't attempt to start. 645 */ 646 if (qatomic_read(&CalculatingState) == DIRTY_RATE_STATUS_MEASURING) { 647 error_setg(errp, "the dirty rate is already being measured."); 648 return; 649 } 650 651 if (!is_sample_period_valid(calc_time)) { 652 error_setg(errp, "calc-time is out of range[%d, %d].", 653 MIN_FETCH_DIRTYRATE_TIME_SEC, 654 MAX_FETCH_DIRTYRATE_TIME_SEC); 655 return; 656 } 657 658 if (!has_mode) { 659 mode = DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING; 660 } 661 662 if (has_sample_pages && mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) { 663 error_setg(errp, "either sample-pages or dirty-ring can be specified."); 664 return; 665 } 666 667 if (has_sample_pages) { 668 if (!is_sample_pages_valid(sample_pages)) { 669 error_setg(errp, "sample-pages is out of range[%d, %d].", 670 MIN_SAMPLE_PAGE_COUNT, 671 MAX_SAMPLE_PAGE_COUNT); 672 return; 673 } 674 } else { 675 sample_pages = DIRTYRATE_DEFAULT_SAMPLE_PAGES; 676 } 677 678 /* 679 * dirty ring mode only works when kvm dirty ring is enabled. 680 * on the contrary, dirty bitmap mode is not. 681 */ 682 if (((mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) && 683 !kvm_dirty_ring_enabled()) || 684 ((mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) && 685 kvm_dirty_ring_enabled())) { 686 error_setg(errp, "mode %s is not enabled, use other method instead.", 687 DirtyRateMeasureMode_str(mode)); 688 return; 689 } 690 691 /* 692 * Init calculation state as unstarted. 693 */ 694 ret = dirtyrate_set_state(&CalculatingState, CalculatingState, 695 DIRTY_RATE_STATUS_UNSTARTED); 696 if (ret == -1) { 697 error_setg(errp, "init dirty rate calculation state failed."); 698 return; 699 } 700 701 config.sample_period_seconds = calc_time; 702 config.sample_pages_per_gigabytes = sample_pages; 703 config.mode = mode; 704 705 cleanup_dirtyrate_stat(config); 706 707 /* 708 * update dirty rate mode so that we can figure out what mode has 709 * been used in last calculation 710 **/ 711 dirtyrate_mode = mode; 712 713 start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) / 1000; 714 init_dirtyrate_stat(start_time, config); 715 716 qemu_thread_create(&thread, "get_dirtyrate", get_dirtyrate_thread, 717 (void *)&config, QEMU_THREAD_DETACHED); 718 } 719 720 struct DirtyRateInfo *qmp_query_dirty_rate(Error **errp) 721 { 722 return query_dirty_rate_info(); 723 } 724 725 void hmp_info_dirty_rate(Monitor *mon, const QDict *qdict) 726 { 727 DirtyRateInfo *info = query_dirty_rate_info(); 728 729 monitor_printf(mon, "Status: %s\n", 730 DirtyRateStatus_str(info->status)); 731 monitor_printf(mon, "Start Time: %"PRIi64" (ms)\n", 732 info->start_time); 733 monitor_printf(mon, "Sample Pages: %"PRIu64" (per GB)\n", 734 info->sample_pages); 735 monitor_printf(mon, "Period: %"PRIi64" (sec)\n", 736 info->calc_time); 737 monitor_printf(mon, "Mode: %s\n", 738 DirtyRateMeasureMode_str(info->mode)); 739 monitor_printf(mon, "Dirty rate: "); 740 if (info->has_dirty_rate) { 741 monitor_printf(mon, "%"PRIi64" (MB/s)\n", info->dirty_rate); 742 if (info->has_vcpu_dirty_rate) { 743 DirtyRateVcpuList *rate, *head = info->vcpu_dirty_rate; 744 for (rate = head; rate != NULL; rate = rate->next) { 745 monitor_printf(mon, "vcpu[%"PRIi64"], Dirty rate: %"PRIi64 746 " (MB/s)\n", rate->value->id, 747 rate->value->dirty_rate); 748 } 749 } 750 } else { 751 monitor_printf(mon, "(not ready)\n"); 752 } 753 754 qapi_free_DirtyRateVcpuList(info->vcpu_dirty_rate); 755 g_free(info); 756 } 757 758 void hmp_calc_dirty_rate(Monitor *mon, const QDict *qdict) 759 { 760 int64_t sec = qdict_get_try_int(qdict, "second", 0); 761 int64_t sample_pages = qdict_get_try_int(qdict, "sample_pages_per_GB", -1); 762 bool has_sample_pages = (sample_pages != -1); 763 bool dirty_ring = qdict_get_try_bool(qdict, "dirty_ring", false); 764 bool dirty_bitmap = qdict_get_try_bool(qdict, "dirty_bitmap", false); 765 DirtyRateMeasureMode mode = DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING; 766 Error *err = NULL; 767 768 if (!sec) { 769 monitor_printf(mon, "Incorrect period length specified!\n"); 770 return; 771 } 772 773 if (dirty_ring && dirty_bitmap) { 774 monitor_printf(mon, "Either dirty ring or dirty bitmap " 775 "can be specified!\n"); 776 return; 777 } 778 779 if (dirty_bitmap) { 780 mode = DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP; 781 } else if (dirty_ring) { 782 mode = DIRTY_RATE_MEASURE_MODE_DIRTY_RING; 783 } 784 785 qmp_calc_dirty_rate(sec, has_sample_pages, sample_pages, true, 786 mode, &err); 787 if (err) { 788 hmp_handle_error(mon, err); 789 return; 790 } 791 792 monitor_printf(mon, "Starting dirty rate measurement with period %"PRIi64 793 " seconds\n", sec); 794 monitor_printf(mon, "[Please use 'info dirty_rate' to check results]\n"); 795 } 796