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 dirty_stat_wait(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 inline void record_dirtypages(DirtyPageRecord *dirty_pages, 64 CPUState *cpu, bool start) 65 { 66 if (start) { 67 dirty_pages[cpu->cpu_index].start_pages = cpu->dirty_pages; 68 } else { 69 dirty_pages[cpu->cpu_index].end_pages = cpu->dirty_pages; 70 } 71 } 72 73 static int64_t do_calculate_dirtyrate(DirtyPageRecord dirty_pages, 74 int64_t calc_time_ms) 75 { 76 uint64_t memory_size_MB; 77 uint64_t increased_dirty_pages = 78 dirty_pages.end_pages - dirty_pages.start_pages; 79 80 memory_size_MB = (increased_dirty_pages * TARGET_PAGE_SIZE) >> 20; 81 82 return memory_size_MB * 1000 / calc_time_ms; 83 } 84 85 void global_dirty_log_change(unsigned int flag, bool start) 86 { 87 qemu_mutex_lock_iothread(); 88 if (start) { 89 memory_global_dirty_log_start(flag); 90 } else { 91 memory_global_dirty_log_stop(flag); 92 } 93 qemu_mutex_unlock_iothread(); 94 } 95 96 /* 97 * global_dirty_log_sync 98 * 1. sync dirty log from kvm 99 * 2. stop dirty tracking if needed. 100 */ 101 static void global_dirty_log_sync(unsigned int flag, bool one_shot) 102 { 103 qemu_mutex_lock_iothread(); 104 memory_global_dirty_log_sync(); 105 if (one_shot) { 106 memory_global_dirty_log_stop(flag); 107 } 108 qemu_mutex_unlock_iothread(); 109 } 110 111 static DirtyPageRecord *vcpu_dirty_stat_alloc(VcpuStat *stat) 112 { 113 CPUState *cpu; 114 int nvcpu = 0; 115 116 CPU_FOREACH(cpu) { 117 nvcpu++; 118 } 119 120 stat->nvcpu = nvcpu; 121 stat->rates = g_new0(DirtyRateVcpu, nvcpu); 122 123 return g_new0(DirtyPageRecord, nvcpu); 124 } 125 126 static void vcpu_dirty_stat_collect(VcpuStat *stat, 127 DirtyPageRecord *records, 128 bool start) 129 { 130 CPUState *cpu; 131 132 CPU_FOREACH(cpu) { 133 record_dirtypages(records, cpu, start); 134 } 135 } 136 137 int64_t vcpu_calculate_dirtyrate(int64_t calc_time_ms, 138 VcpuStat *stat, 139 unsigned int flag, 140 bool one_shot) 141 { 142 DirtyPageRecord *records; 143 int64_t init_time_ms; 144 int64_t duration; 145 int64_t dirtyrate; 146 int i = 0; 147 unsigned int gen_id; 148 149 retry: 150 init_time_ms = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 151 152 cpu_list_lock(); 153 gen_id = cpu_list_generation_id_get(); 154 records = vcpu_dirty_stat_alloc(stat); 155 vcpu_dirty_stat_collect(stat, records, true); 156 cpu_list_unlock(); 157 158 duration = dirty_stat_wait(calc_time_ms, init_time_ms); 159 160 global_dirty_log_sync(flag, one_shot); 161 162 cpu_list_lock(); 163 if (gen_id != cpu_list_generation_id_get()) { 164 g_free(records); 165 g_free(stat->rates); 166 cpu_list_unlock(); 167 goto retry; 168 } 169 vcpu_dirty_stat_collect(stat, records, false); 170 cpu_list_unlock(); 171 172 for (i = 0; i < stat->nvcpu; i++) { 173 dirtyrate = do_calculate_dirtyrate(records[i], duration); 174 175 stat->rates[i].id = i; 176 stat->rates[i].dirty_rate = dirtyrate; 177 178 trace_dirtyrate_do_calculate_vcpu(i, dirtyrate); 179 } 180 181 g_free(records); 182 183 return duration; 184 } 185 186 static bool is_sample_period_valid(int64_t sec) 187 { 188 if (sec < MIN_FETCH_DIRTYRATE_TIME_SEC || 189 sec > MAX_FETCH_DIRTYRATE_TIME_SEC) { 190 return false; 191 } 192 193 return true; 194 } 195 196 static bool is_sample_pages_valid(int64_t pages) 197 { 198 return pages >= MIN_SAMPLE_PAGE_COUNT && 199 pages <= MAX_SAMPLE_PAGE_COUNT; 200 } 201 202 static int dirtyrate_set_state(int *state, int old_state, int new_state) 203 { 204 assert(new_state < DIRTY_RATE_STATUS__MAX); 205 trace_dirtyrate_set_state(DirtyRateStatus_str(new_state)); 206 if (qatomic_cmpxchg(state, old_state, new_state) == old_state) { 207 return 0; 208 } else { 209 return -1; 210 } 211 } 212 213 static struct DirtyRateInfo *query_dirty_rate_info(void) 214 { 215 int i; 216 int64_t dirty_rate = DirtyStat.dirty_rate; 217 struct DirtyRateInfo *info = g_new0(DirtyRateInfo, 1); 218 DirtyRateVcpuList *head = NULL, **tail = &head; 219 220 info->status = CalculatingState; 221 info->start_time = DirtyStat.start_time; 222 info->calc_time = DirtyStat.calc_time; 223 info->sample_pages = DirtyStat.sample_pages; 224 info->mode = dirtyrate_mode; 225 226 if (qatomic_read(&CalculatingState) == DIRTY_RATE_STATUS_MEASURED) { 227 info->has_dirty_rate = true; 228 info->dirty_rate = dirty_rate; 229 230 if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) { 231 /* 232 * set sample_pages with 0 to indicate page sampling 233 * isn't enabled 234 **/ 235 info->sample_pages = 0; 236 info->has_vcpu_dirty_rate = true; 237 for (i = 0; i < DirtyStat.dirty_ring.nvcpu; i++) { 238 DirtyRateVcpu *rate = g_new0(DirtyRateVcpu, 1); 239 rate->id = DirtyStat.dirty_ring.rates[i].id; 240 rate->dirty_rate = DirtyStat.dirty_ring.rates[i].dirty_rate; 241 QAPI_LIST_APPEND(tail, rate); 242 } 243 info->vcpu_dirty_rate = head; 244 } 245 246 if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) { 247 info->sample_pages = 0; 248 } 249 } 250 251 trace_query_dirty_rate_info(DirtyRateStatus_str(CalculatingState)); 252 253 return info; 254 } 255 256 static void init_dirtyrate_stat(int64_t start_time, 257 struct DirtyRateConfig config) 258 { 259 DirtyStat.dirty_rate = -1; 260 DirtyStat.start_time = start_time; 261 DirtyStat.calc_time = config.sample_period_seconds; 262 DirtyStat.sample_pages = config.sample_pages_per_gigabytes; 263 264 switch (config.mode) { 265 case DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING: 266 DirtyStat.page_sampling.total_dirty_samples = 0; 267 DirtyStat.page_sampling.total_sample_count = 0; 268 DirtyStat.page_sampling.total_block_mem_MB = 0; 269 break; 270 case DIRTY_RATE_MEASURE_MODE_DIRTY_RING: 271 DirtyStat.dirty_ring.nvcpu = -1; 272 DirtyStat.dirty_ring.rates = NULL; 273 break; 274 default: 275 break; 276 } 277 } 278 279 static void cleanup_dirtyrate_stat(struct DirtyRateConfig config) 280 { 281 /* last calc-dirty-rate qmp use dirty ring mode */ 282 if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) { 283 free(DirtyStat.dirty_ring.rates); 284 DirtyStat.dirty_ring.rates = NULL; 285 } 286 } 287 288 static void update_dirtyrate_stat(struct RamblockDirtyInfo *info) 289 { 290 DirtyStat.page_sampling.total_dirty_samples += info->sample_dirty_count; 291 DirtyStat.page_sampling.total_sample_count += info->sample_pages_count; 292 /* size of total pages in MB */ 293 DirtyStat.page_sampling.total_block_mem_MB += (info->ramblock_pages * 294 TARGET_PAGE_SIZE) >> 20; 295 } 296 297 static void update_dirtyrate(uint64_t msec) 298 { 299 uint64_t dirtyrate; 300 uint64_t total_dirty_samples = DirtyStat.page_sampling.total_dirty_samples; 301 uint64_t total_sample_count = DirtyStat.page_sampling.total_sample_count; 302 uint64_t total_block_mem_MB = DirtyStat.page_sampling.total_block_mem_MB; 303 304 dirtyrate = total_dirty_samples * total_block_mem_MB * 305 1000 / (total_sample_count * msec); 306 307 DirtyStat.dirty_rate = dirtyrate; 308 } 309 310 /* 311 * get hash result for the sampled memory with length of TARGET_PAGE_SIZE 312 * in ramblock, which starts from ramblock base address. 313 */ 314 static uint32_t get_ramblock_vfn_hash(struct RamblockDirtyInfo *info, 315 uint64_t vfn) 316 { 317 uint32_t crc; 318 319 crc = crc32(0, (info->ramblock_addr + 320 vfn * TARGET_PAGE_SIZE), TARGET_PAGE_SIZE); 321 322 trace_get_ramblock_vfn_hash(info->idstr, vfn, crc); 323 return crc; 324 } 325 326 static bool save_ramblock_hash(struct RamblockDirtyInfo *info) 327 { 328 unsigned int sample_pages_count; 329 int i; 330 GRand *rand; 331 332 sample_pages_count = info->sample_pages_count; 333 334 /* ramblock size less than one page, return success to skip this ramblock */ 335 if (unlikely(info->ramblock_pages == 0 || sample_pages_count == 0)) { 336 return true; 337 } 338 339 info->hash_result = g_try_malloc0_n(sample_pages_count, 340 sizeof(uint32_t)); 341 if (!info->hash_result) { 342 return false; 343 } 344 345 info->sample_page_vfn = g_try_malloc0_n(sample_pages_count, 346 sizeof(uint64_t)); 347 if (!info->sample_page_vfn) { 348 g_free(info->hash_result); 349 return false; 350 } 351 352 rand = g_rand_new(); 353 for (i = 0; i < sample_pages_count; i++) { 354 info->sample_page_vfn[i] = g_rand_int_range(rand, 0, 355 info->ramblock_pages - 1); 356 info->hash_result[i] = get_ramblock_vfn_hash(info, 357 info->sample_page_vfn[i]); 358 } 359 g_rand_free(rand); 360 361 return true; 362 } 363 364 static void get_ramblock_dirty_info(RAMBlock *block, 365 struct RamblockDirtyInfo *info, 366 struct DirtyRateConfig *config) 367 { 368 uint64_t sample_pages_per_gigabytes = config->sample_pages_per_gigabytes; 369 370 /* Right shift 30 bits to calc ramblock size in GB */ 371 info->sample_pages_count = (qemu_ram_get_used_length(block) * 372 sample_pages_per_gigabytes) >> 30; 373 /* Right shift TARGET_PAGE_BITS to calc page count */ 374 info->ramblock_pages = qemu_ram_get_used_length(block) >> 375 TARGET_PAGE_BITS; 376 info->ramblock_addr = qemu_ram_get_host_addr(block); 377 strcpy(info->idstr, qemu_ram_get_idstr(block)); 378 } 379 380 static void free_ramblock_dirty_info(struct RamblockDirtyInfo *infos, int count) 381 { 382 int i; 383 384 if (!infos) { 385 return; 386 } 387 388 for (i = 0; i < count; i++) { 389 g_free(infos[i].sample_page_vfn); 390 g_free(infos[i].hash_result); 391 } 392 g_free(infos); 393 } 394 395 static bool skip_sample_ramblock(RAMBlock *block) 396 { 397 /* 398 * Sample only blocks larger than MIN_RAMBLOCK_SIZE. 399 */ 400 if (qemu_ram_get_used_length(block) < (MIN_RAMBLOCK_SIZE << 10)) { 401 trace_skip_sample_ramblock(block->idstr, 402 qemu_ram_get_used_length(block)); 403 return true; 404 } 405 406 return false; 407 } 408 409 static bool record_ramblock_hash_info(struct RamblockDirtyInfo **block_dinfo, 410 struct DirtyRateConfig config, 411 int *block_count) 412 { 413 struct RamblockDirtyInfo *info = NULL; 414 struct RamblockDirtyInfo *dinfo = NULL; 415 RAMBlock *block = NULL; 416 int total_count = 0; 417 int index = 0; 418 bool ret = false; 419 420 RAMBLOCK_FOREACH_MIGRATABLE(block) { 421 if (skip_sample_ramblock(block)) { 422 continue; 423 } 424 total_count++; 425 } 426 427 dinfo = g_try_malloc0_n(total_count, sizeof(struct RamblockDirtyInfo)); 428 if (dinfo == NULL) { 429 goto out; 430 } 431 432 RAMBLOCK_FOREACH_MIGRATABLE(block) { 433 if (skip_sample_ramblock(block)) { 434 continue; 435 } 436 if (index >= total_count) { 437 break; 438 } 439 info = &dinfo[index]; 440 get_ramblock_dirty_info(block, info, &config); 441 if (!save_ramblock_hash(info)) { 442 goto out; 443 } 444 index++; 445 } 446 ret = true; 447 448 out: 449 *block_count = index; 450 *block_dinfo = dinfo; 451 return ret; 452 } 453 454 static void calc_page_dirty_rate(struct RamblockDirtyInfo *info) 455 { 456 uint32_t crc; 457 int i; 458 459 for (i = 0; i < info->sample_pages_count; i++) { 460 crc = get_ramblock_vfn_hash(info, info->sample_page_vfn[i]); 461 if (crc != info->hash_result[i]) { 462 trace_calc_page_dirty_rate(info->idstr, crc, info->hash_result[i]); 463 info->sample_dirty_count++; 464 } 465 } 466 } 467 468 static struct RamblockDirtyInfo * 469 find_block_matched(RAMBlock *block, int count, 470 struct RamblockDirtyInfo *infos) 471 { 472 int i; 473 474 for (i = 0; i < count; i++) { 475 if (!strcmp(infos[i].idstr, qemu_ram_get_idstr(block))) { 476 break; 477 } 478 } 479 480 if (i == count) { 481 return NULL; 482 } 483 484 if (infos[i].ramblock_addr != qemu_ram_get_host_addr(block) || 485 infos[i].ramblock_pages != 486 (qemu_ram_get_used_length(block) >> TARGET_PAGE_BITS)) { 487 trace_find_page_matched(block->idstr); 488 return NULL; 489 } 490 491 return &infos[i]; 492 } 493 494 static bool compare_page_hash_info(struct RamblockDirtyInfo *info, 495 int block_count) 496 { 497 struct RamblockDirtyInfo *block_dinfo = NULL; 498 RAMBlock *block = NULL; 499 500 RAMBLOCK_FOREACH_MIGRATABLE(block) { 501 if (skip_sample_ramblock(block)) { 502 continue; 503 } 504 block_dinfo = find_block_matched(block, block_count, info); 505 if (block_dinfo == NULL) { 506 continue; 507 } 508 calc_page_dirty_rate(block_dinfo); 509 update_dirtyrate_stat(block_dinfo); 510 } 511 512 if (DirtyStat.page_sampling.total_sample_count == 0) { 513 return false; 514 } 515 516 return true; 517 } 518 519 static inline void record_dirtypages_bitmap(DirtyPageRecord *dirty_pages, 520 bool start) 521 { 522 if (start) { 523 dirty_pages->start_pages = total_dirty_pages; 524 } else { 525 dirty_pages->end_pages = total_dirty_pages; 526 } 527 } 528 529 static inline void dirtyrate_manual_reset_protect(void) 530 { 531 RAMBlock *block = NULL; 532 533 WITH_RCU_READ_LOCK_GUARD() { 534 RAMBLOCK_FOREACH_MIGRATABLE(block) { 535 memory_region_clear_dirty_bitmap(block->mr, 0, 536 block->used_length); 537 } 538 } 539 } 540 541 static void calculate_dirtyrate_dirty_bitmap(struct DirtyRateConfig config) 542 { 543 int64_t msec = 0; 544 int64_t start_time; 545 DirtyPageRecord dirty_pages; 546 547 qemu_mutex_lock_iothread(); 548 memory_global_dirty_log_start(GLOBAL_DIRTY_DIRTY_RATE); 549 550 /* 551 * 1'round of log sync may return all 1 bits with 552 * KVM_DIRTY_LOG_INITIALLY_SET enable 553 * skip it unconditionally and start dirty tracking 554 * from 2'round of log sync 555 */ 556 memory_global_dirty_log_sync(); 557 558 /* 559 * reset page protect manually and unconditionally. 560 * this make sure kvm dirty log be cleared if 561 * KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE cap is enabled. 562 */ 563 dirtyrate_manual_reset_protect(); 564 qemu_mutex_unlock_iothread(); 565 566 record_dirtypages_bitmap(&dirty_pages, true); 567 568 start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 569 DirtyStat.start_time = start_time / 1000; 570 571 msec = config.sample_period_seconds * 1000; 572 msec = dirty_stat_wait(msec, start_time); 573 DirtyStat.calc_time = msec / 1000; 574 575 /* 576 * do two things. 577 * 1. fetch dirty bitmap from kvm 578 * 2. stop dirty tracking 579 */ 580 global_dirty_log_sync(GLOBAL_DIRTY_DIRTY_RATE, true); 581 582 record_dirtypages_bitmap(&dirty_pages, false); 583 584 DirtyStat.dirty_rate = do_calculate_dirtyrate(dirty_pages, msec); 585 } 586 587 static void calculate_dirtyrate_dirty_ring(struct DirtyRateConfig config) 588 { 589 int64_t duration; 590 uint64_t dirtyrate = 0; 591 uint64_t dirtyrate_sum = 0; 592 int i = 0; 593 594 /* start log sync */ 595 global_dirty_log_change(GLOBAL_DIRTY_DIRTY_RATE, true); 596 597 DirtyStat.start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) / 1000; 598 599 /* calculate vcpu dirtyrate */ 600 duration = vcpu_calculate_dirtyrate(config.sample_period_seconds * 1000, 601 &DirtyStat.dirty_ring, 602 GLOBAL_DIRTY_DIRTY_RATE, 603 true); 604 605 DirtyStat.calc_time = duration / 1000; 606 607 /* calculate vm dirtyrate */ 608 for (i = 0; i < DirtyStat.dirty_ring.nvcpu; i++) { 609 dirtyrate = DirtyStat.dirty_ring.rates[i].dirty_rate; 610 DirtyStat.dirty_ring.rates[i].dirty_rate = dirtyrate; 611 dirtyrate_sum += dirtyrate; 612 } 613 614 DirtyStat.dirty_rate = dirtyrate_sum; 615 } 616 617 static void calculate_dirtyrate_sample_vm(struct DirtyRateConfig config) 618 { 619 struct RamblockDirtyInfo *block_dinfo = NULL; 620 int block_count = 0; 621 int64_t msec = 0; 622 int64_t initial_time; 623 624 rcu_read_lock(); 625 initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 626 if (!record_ramblock_hash_info(&block_dinfo, config, &block_count)) { 627 goto out; 628 } 629 rcu_read_unlock(); 630 631 msec = config.sample_period_seconds * 1000; 632 msec = dirty_stat_wait(msec, initial_time); 633 DirtyStat.start_time = initial_time / 1000; 634 DirtyStat.calc_time = msec / 1000; 635 636 rcu_read_lock(); 637 if (!compare_page_hash_info(block_dinfo, block_count)) { 638 goto out; 639 } 640 641 update_dirtyrate(msec); 642 643 out: 644 rcu_read_unlock(); 645 free_ramblock_dirty_info(block_dinfo, block_count); 646 } 647 648 static void calculate_dirtyrate(struct DirtyRateConfig config) 649 { 650 if (config.mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) { 651 calculate_dirtyrate_dirty_bitmap(config); 652 } else if (config.mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) { 653 calculate_dirtyrate_dirty_ring(config); 654 } else { 655 calculate_dirtyrate_sample_vm(config); 656 } 657 658 trace_dirtyrate_calculate(DirtyStat.dirty_rate); 659 } 660 661 void *get_dirtyrate_thread(void *arg) 662 { 663 struct DirtyRateConfig config = *(struct DirtyRateConfig *)arg; 664 int ret; 665 rcu_register_thread(); 666 667 ret = dirtyrate_set_state(&CalculatingState, DIRTY_RATE_STATUS_UNSTARTED, 668 DIRTY_RATE_STATUS_MEASURING); 669 if (ret == -1) { 670 error_report("change dirtyrate state failed."); 671 return NULL; 672 } 673 674 calculate_dirtyrate(config); 675 676 ret = dirtyrate_set_state(&CalculatingState, DIRTY_RATE_STATUS_MEASURING, 677 DIRTY_RATE_STATUS_MEASURED); 678 if (ret == -1) { 679 error_report("change dirtyrate state failed."); 680 } 681 682 rcu_unregister_thread(); 683 return NULL; 684 } 685 686 void qmp_calc_dirty_rate(int64_t calc_time, 687 bool has_sample_pages, 688 int64_t sample_pages, 689 bool has_mode, 690 DirtyRateMeasureMode mode, 691 Error **errp) 692 { 693 static struct DirtyRateConfig config; 694 QemuThread thread; 695 int ret; 696 int64_t start_time; 697 698 /* 699 * If the dirty rate is already being measured, don't attempt to start. 700 */ 701 if (qatomic_read(&CalculatingState) == DIRTY_RATE_STATUS_MEASURING) { 702 error_setg(errp, "the dirty rate is already being measured."); 703 return; 704 } 705 706 if (!is_sample_period_valid(calc_time)) { 707 error_setg(errp, "calc-time is out of range[%d, %d].", 708 MIN_FETCH_DIRTYRATE_TIME_SEC, 709 MAX_FETCH_DIRTYRATE_TIME_SEC); 710 return; 711 } 712 713 if (!has_mode) { 714 mode = DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING; 715 } 716 717 if (has_sample_pages && mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) { 718 error_setg(errp, "either sample-pages or dirty-ring can be specified."); 719 return; 720 } 721 722 if (has_sample_pages) { 723 if (!is_sample_pages_valid(sample_pages)) { 724 error_setg(errp, "sample-pages is out of range[%d, %d].", 725 MIN_SAMPLE_PAGE_COUNT, 726 MAX_SAMPLE_PAGE_COUNT); 727 return; 728 } 729 } else { 730 sample_pages = DIRTYRATE_DEFAULT_SAMPLE_PAGES; 731 } 732 733 /* 734 * dirty ring mode only works when kvm dirty ring is enabled. 735 * on the contrary, dirty bitmap mode is not. 736 */ 737 if (((mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) && 738 !kvm_dirty_ring_enabled()) || 739 ((mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) && 740 kvm_dirty_ring_enabled())) { 741 error_setg(errp, "mode %s is not enabled, use other method instead.", 742 DirtyRateMeasureMode_str(mode)); 743 return; 744 } 745 746 /* 747 * Init calculation state as unstarted. 748 */ 749 ret = dirtyrate_set_state(&CalculatingState, CalculatingState, 750 DIRTY_RATE_STATUS_UNSTARTED); 751 if (ret == -1) { 752 error_setg(errp, "init dirty rate calculation state failed."); 753 return; 754 } 755 756 config.sample_period_seconds = calc_time; 757 config.sample_pages_per_gigabytes = sample_pages; 758 config.mode = mode; 759 760 cleanup_dirtyrate_stat(config); 761 762 /* 763 * update dirty rate mode so that we can figure out what mode has 764 * been used in last calculation 765 **/ 766 dirtyrate_mode = mode; 767 768 start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) / 1000; 769 init_dirtyrate_stat(start_time, config); 770 771 qemu_thread_create(&thread, "get_dirtyrate", get_dirtyrate_thread, 772 (void *)&config, QEMU_THREAD_DETACHED); 773 } 774 775 struct DirtyRateInfo *qmp_query_dirty_rate(Error **errp) 776 { 777 return query_dirty_rate_info(); 778 } 779 780 void hmp_info_dirty_rate(Monitor *mon, const QDict *qdict) 781 { 782 DirtyRateInfo *info = query_dirty_rate_info(); 783 784 monitor_printf(mon, "Status: %s\n", 785 DirtyRateStatus_str(info->status)); 786 monitor_printf(mon, "Start Time: %"PRIi64" (ms)\n", 787 info->start_time); 788 monitor_printf(mon, "Sample Pages: %"PRIu64" (per GB)\n", 789 info->sample_pages); 790 monitor_printf(mon, "Period: %"PRIi64" (sec)\n", 791 info->calc_time); 792 monitor_printf(mon, "Mode: %s\n", 793 DirtyRateMeasureMode_str(info->mode)); 794 monitor_printf(mon, "Dirty rate: "); 795 if (info->has_dirty_rate) { 796 monitor_printf(mon, "%"PRIi64" (MB/s)\n", info->dirty_rate); 797 if (info->has_vcpu_dirty_rate) { 798 DirtyRateVcpuList *rate, *head = info->vcpu_dirty_rate; 799 for (rate = head; rate != NULL; rate = rate->next) { 800 monitor_printf(mon, "vcpu[%"PRIi64"], Dirty rate: %"PRIi64 801 " (MB/s)\n", rate->value->id, 802 rate->value->dirty_rate); 803 } 804 } 805 } else { 806 monitor_printf(mon, "(not ready)\n"); 807 } 808 809 qapi_free_DirtyRateVcpuList(info->vcpu_dirty_rate); 810 g_free(info); 811 } 812 813 void hmp_calc_dirty_rate(Monitor *mon, const QDict *qdict) 814 { 815 int64_t sec = qdict_get_try_int(qdict, "second", 0); 816 int64_t sample_pages = qdict_get_try_int(qdict, "sample_pages_per_GB", -1); 817 bool has_sample_pages = (sample_pages != -1); 818 bool dirty_ring = qdict_get_try_bool(qdict, "dirty_ring", false); 819 bool dirty_bitmap = qdict_get_try_bool(qdict, "dirty_bitmap", false); 820 DirtyRateMeasureMode mode = DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING; 821 Error *err = NULL; 822 823 if (!sec) { 824 monitor_printf(mon, "Incorrect period length specified!\n"); 825 return; 826 } 827 828 if (dirty_ring && dirty_bitmap) { 829 monitor_printf(mon, "Either dirty ring or dirty bitmap " 830 "can be specified!\n"); 831 return; 832 } 833 834 if (dirty_bitmap) { 835 mode = DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP; 836 } else if (dirty_ring) { 837 mode = DIRTY_RATE_MEASURE_MODE_DIRTY_RING; 838 } 839 840 qmp_calc_dirty_rate(sec, has_sample_pages, sample_pages, true, 841 mode, &err); 842 if (err) { 843 hmp_handle_error(mon, err); 844 return; 845 } 846 847 monitor_printf(mon, "Starting dirty rate measurement with period %"PRIi64 848 " seconds\n", sec); 849 monitor_printf(mon, "[Please use 'info dirty_rate' to check results]\n"); 850 } 851