1
2
3
4
5
6
7
8
9
10
11
12
13#include "qemu/osdep.h"
14#include "qemu/error-report.h"
15#include "hw/core/cpu.h"
16#include "qapi/error.h"
17#include "system/ramblock.h"
18#include "exec/target_page.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 "qobject/qdict.h"
28#include "system/kvm.h"
29#include "system/runstate.h"
30#include "system/memory.h"
31#include "qemu/xxhash.h"
32#include "migration.h"
33
34
35
36
37
38
39uint64_t total_dirty_pages;
40
41typedef struct DirtyPageRecord {
42 uint64_t start_pages;
43 uint64_t end_pages;
44} DirtyPageRecord;
45
46static int CalculatingState = DIRTY_RATE_STATUS_UNSTARTED;
47static struct DirtyRateStat DirtyStat;
48static DirtyRateMeasureMode dirtyrate_mode =
49 DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING;
50
51static int64_t dirty_stat_wait(int64_t msec, int64_t initial_time)
52{
53 int64_t current_time;
54
55 current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
56 if ((current_time - initial_time) >= msec) {
57 msec = current_time - initial_time;
58 } else {
59 g_usleep((msec + initial_time - current_time) * 1000);
60
61 msec = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - initial_time;
62 }
63
64 return msec;
65}
66
67static inline void record_dirtypages(DirtyPageRecord *dirty_pages,
68 CPUState *cpu, bool start)
69{
70 if (start) {
71 dirty_pages[cpu->cpu_index].start_pages = cpu->dirty_pages;
72 } else {
73 dirty_pages[cpu->cpu_index].end_pages = cpu->dirty_pages;
74 }
75}
76
77static int64_t do_calculate_dirtyrate(DirtyPageRecord dirty_pages,
78 int64_t calc_time_ms)
79{
80 uint64_t increased_dirty_pages =
81 dirty_pages.end_pages - dirty_pages.start_pages;
82
83
84
85
86
87 return qemu_target_pages_to_MiB(increased_dirty_pages * 1000) /
88 calc_time_ms;
89}
90
91void global_dirty_log_change(unsigned int flag, bool start)
92{
93 Error *local_err = NULL;
94 bool ret;
95
96 bql_lock();
97 if (start) {
98 ret = memory_global_dirty_log_start(flag, &local_err);
99 if (!ret) {
100 error_report_err(local_err);
101 }
102 } else {
103 memory_global_dirty_log_stop(flag);
104 }
105 bql_unlock();
106}
107
108
109
110
111
112
113static void global_dirty_log_sync(unsigned int flag, bool one_shot)
114{
115 bql_lock();
116 memory_global_dirty_log_sync(false);
117 if (one_shot) {
118 memory_global_dirty_log_stop(flag);
119 }
120 bql_unlock();
121}
122
123static DirtyPageRecord *vcpu_dirty_stat_alloc(VcpuStat *stat)
124{
125 CPUState *cpu;
126 int nvcpu = 0;
127
128 CPU_FOREACH(cpu) {
129 nvcpu++;
130 }
131
132 stat->nvcpu = nvcpu;
133 stat->rates = g_new0(DirtyRateVcpu, nvcpu);
134
135 return g_new0(DirtyPageRecord, nvcpu);
136}
137
138static void vcpu_dirty_stat_collect(DirtyPageRecord *records,
139 bool start)
140{
141 CPUState *cpu;
142
143 CPU_FOREACH(cpu) {
144 record_dirtypages(records, cpu, start);
145 }
146}
147
148int64_t vcpu_calculate_dirtyrate(int64_t calc_time_ms,
149 VcpuStat *stat,
150 unsigned int flag,
151 bool one_shot)
152{
153 DirtyPageRecord *records = NULL;
154 int64_t init_time_ms;
155 int64_t duration;
156 int64_t dirtyrate;
157 int i = 0;
158 unsigned int gen_id = 0;
159
160retry:
161 init_time_ms = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
162
163 WITH_QEMU_LOCK_GUARD(&qemu_cpu_list_lock) {
164 gen_id = cpu_list_generation_id_get();
165 records = vcpu_dirty_stat_alloc(stat);
166 vcpu_dirty_stat_collect(records, true);
167 }
168
169 duration = dirty_stat_wait(calc_time_ms, init_time_ms);
170
171 global_dirty_log_sync(flag, one_shot);
172
173 WITH_QEMU_LOCK_GUARD(&qemu_cpu_list_lock) {
174 if (gen_id != cpu_list_generation_id_get()) {
175 g_free(records);
176 g_free(stat->rates);
177 cpu_list_unlock();
178 goto retry;
179 }
180 vcpu_dirty_stat_collect(records, false);
181 }
182
183 for (i = 0; i < stat->nvcpu; i++) {
184 dirtyrate = do_calculate_dirtyrate(records[i], duration);
185
186 stat->rates[i].id = i;
187 stat->rates[i].dirty_rate = dirtyrate;
188
189 trace_dirtyrate_do_calculate_vcpu(i, dirtyrate);
190 }
191
192 g_free(records);
193
194 return duration;
195}
196
197static bool is_calc_time_valid(int64_t msec)
198{
199 if ((msec < MIN_CALC_TIME_MS) || (msec > MAX_CALC_TIME_MS)) {
200 return false;
201 }
202
203 return true;
204}
205
206static bool is_sample_pages_valid(int64_t pages)
207{
208 return pages >= MIN_SAMPLE_PAGE_COUNT &&
209 pages <= MAX_SAMPLE_PAGE_COUNT;
210}
211
212static int dirtyrate_set_state(int *state, int old_state, int new_state)
213{
214 assert(new_state < DIRTY_RATE_STATUS__MAX);
215 trace_dirtyrate_set_state(DirtyRateStatus_str(new_state));
216 if (qatomic_cmpxchg(state, old_state, new_state) == old_state) {
217 return 0;
218 } else {
219 return -1;
220 }
221}
222
223
224static int time_unit_to_power(TimeUnit time_unit)
225{
226 switch (time_unit) {
227 case TIME_UNIT_SECOND:
228 return 0;
229 case TIME_UNIT_MILLISECOND:
230 return -3;
231 default:
232 g_assert_not_reached();
233 }
234}
235
236static int64_t convert_time_unit(int64_t value, TimeUnit unit_from,
237 TimeUnit unit_to)
238{
239 int power = time_unit_to_power(unit_from) -
240 time_unit_to_power(unit_to);
241 while (power < 0) {
242 value /= 10;
243 power += 1;
244 }
245 while (power > 0) {
246 value *= 10;
247 power -= 1;
248 }
249 return value;
250}
251
252
253static struct DirtyRateInfo *
254query_dirty_rate_info(TimeUnit calc_time_unit)
255{
256 int i;
257 int64_t dirty_rate = DirtyStat.dirty_rate;
258 struct DirtyRateInfo *info = g_new0(DirtyRateInfo, 1);
259 DirtyRateVcpuList *head = NULL, **tail = &head;
260
261 info->status = CalculatingState;
262 info->start_time = DirtyStat.start_time;
263 info->calc_time = convert_time_unit(DirtyStat.calc_time_ms,
264 TIME_UNIT_MILLISECOND,
265 calc_time_unit);
266 info->calc_time_unit = calc_time_unit;
267 info->sample_pages = DirtyStat.sample_pages;
268 info->mode = dirtyrate_mode;
269
270 if (qatomic_read(&CalculatingState) == DIRTY_RATE_STATUS_MEASURED) {
271 info->has_dirty_rate = true;
272 info->dirty_rate = dirty_rate;
273
274 if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) {
275
276
277
278
279 info->sample_pages = 0;
280 info->has_vcpu_dirty_rate = true;
281 for (i = 0; i < DirtyStat.dirty_ring.nvcpu; i++) {
282 DirtyRateVcpu *rate = g_new0(DirtyRateVcpu, 1);
283 rate->id = DirtyStat.dirty_ring.rates[i].id;
284 rate->dirty_rate = DirtyStat.dirty_ring.rates[i].dirty_rate;
285 QAPI_LIST_APPEND(tail, rate);
286 }
287 info->vcpu_dirty_rate = head;
288 }
289
290 if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) {
291 info->sample_pages = 0;
292 }
293 }
294
295 trace_query_dirty_rate_info(DirtyRateStatus_str(CalculatingState));
296
297 return info;
298}
299
300static void init_dirtyrate_stat(struct DirtyRateConfig config)
301{
302 DirtyStat.dirty_rate = -1;
303 DirtyStat.start_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) / 1000;
304 DirtyStat.calc_time_ms = config.calc_time_ms;
305 DirtyStat.sample_pages = config.sample_pages_per_gigabytes;
306
307 switch (config.mode) {
308 case DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING:
309 DirtyStat.page_sampling.total_dirty_samples = 0;
310 DirtyStat.page_sampling.total_sample_count = 0;
311 DirtyStat.page_sampling.total_block_mem_MB = 0;
312 break;
313 case DIRTY_RATE_MEASURE_MODE_DIRTY_RING:
314 DirtyStat.dirty_ring.nvcpu = -1;
315 DirtyStat.dirty_ring.rates = NULL;
316 break;
317 default:
318 break;
319 }
320}
321
322static void cleanup_dirtyrate_stat(struct DirtyRateConfig config)
323{
324
325 if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) {
326 free(DirtyStat.dirty_ring.rates);
327 DirtyStat.dirty_ring.rates = NULL;
328 }
329}
330
331static void update_dirtyrate_stat(struct RamblockDirtyInfo *info)
332{
333 DirtyStat.page_sampling.total_dirty_samples += info->sample_dirty_count;
334 DirtyStat.page_sampling.total_sample_count += info->sample_pages_count;
335
336 DirtyStat.page_sampling.total_block_mem_MB +=
337 qemu_target_pages_to_MiB(info->ramblock_pages);
338}
339
340static void update_dirtyrate(uint64_t msec)
341{
342 uint64_t dirtyrate;
343 uint64_t total_dirty_samples = DirtyStat.page_sampling.total_dirty_samples;
344 uint64_t total_sample_count = DirtyStat.page_sampling.total_sample_count;
345 uint64_t total_block_mem_MB = DirtyStat.page_sampling.total_block_mem_MB;
346
347 dirtyrate = total_dirty_samples * total_block_mem_MB *
348 1000 / (total_sample_count * msec);
349
350 DirtyStat.dirty_rate = dirtyrate;
351}
352
353
354
355
356static uint32_t compute_page_hash(void *ptr)
357{
358 size_t page_size = qemu_target_page_size();
359 uint32_t i;
360 uint64_t v1, v2, v3, v4;
361 uint64_t res;
362 const uint64_t *p = ptr;
363
364 v1 = QEMU_XXHASH_SEED + XXH_PRIME64_1 + XXH_PRIME64_2;
365 v2 = QEMU_XXHASH_SEED + XXH_PRIME64_2;
366 v3 = QEMU_XXHASH_SEED + 0;
367 v4 = QEMU_XXHASH_SEED - XXH_PRIME64_1;
368 for (i = 0; i < page_size / 8; i += 4) {
369 v1 = XXH64_round(v1, p[i + 0]);
370 v2 = XXH64_round(v2, p[i + 1]);
371 v3 = XXH64_round(v3, p[i + 2]);
372 v4 = XXH64_round(v4, p[i + 3]);
373 }
374 res = XXH64_mergerounds(v1, v2, v3, v4);
375 res += page_size;
376 res = XXH64_avalanche(res);
377 return (uint32_t)(res & UINT32_MAX);
378}
379
380
381
382
383
384
385static uint32_t get_ramblock_vfn_hash(struct RamblockDirtyInfo *info,
386 uint64_t vfn)
387{
388 uint32_t hash;
389
390 hash = compute_page_hash(info->ramblock_addr +
391 vfn * qemu_target_page_size());
392
393 trace_get_ramblock_vfn_hash(info->idstr, vfn, hash);
394 return hash;
395}
396
397static bool save_ramblock_hash(struct RamblockDirtyInfo *info)
398{
399 unsigned int sample_pages_count;
400 int i;
401 GRand *rand;
402
403 sample_pages_count = info->sample_pages_count;
404
405
406 if (unlikely(info->ramblock_pages == 0 || sample_pages_count == 0)) {
407 return true;
408 }
409
410 info->hash_result = g_try_malloc0_n(sample_pages_count,
411 sizeof(uint32_t));
412 if (!info->hash_result) {
413 return false;
414 }
415
416 info->sample_page_vfn = g_try_malloc0_n(sample_pages_count,
417 sizeof(uint64_t));
418 if (!info->sample_page_vfn) {
419 g_free(info->hash_result);
420 return false;
421 }
422
423 rand = g_rand_new();
424 for (i = 0; i < sample_pages_count; i++) {
425 info->sample_page_vfn[i] = g_rand_int_range(rand, 0,
426 info->ramblock_pages - 1);
427 info->hash_result[i] = get_ramblock_vfn_hash(info,
428 info->sample_page_vfn[i]);
429 }
430 g_rand_free(rand);
431
432 return true;
433}
434
435static void get_ramblock_dirty_info(RAMBlock *block,
436 struct RamblockDirtyInfo *info,
437 struct DirtyRateConfig *config)
438{
439 uint64_t sample_pages_per_gigabytes = config->sample_pages_per_gigabytes;
440 gsize len;
441
442
443 info->sample_pages_count = (qemu_ram_get_used_length(block) *
444 sample_pages_per_gigabytes) >> 30;
445
446 info->ramblock_pages = qemu_ram_get_used_length(block) >>
447 qemu_target_page_bits();
448 info->ramblock_addr = qemu_ram_get_host_addr(block);
449 len = g_strlcpy(info->idstr, qemu_ram_get_idstr(block),
450 sizeof(info->idstr));
451 g_assert(len < sizeof(info->idstr));
452}
453
454static void free_ramblock_dirty_info(struct RamblockDirtyInfo *infos, int count)
455{
456 int i;
457
458 if (!infos) {
459 return;
460 }
461
462 for (i = 0; i < count; i++) {
463 g_free(infos[i].sample_page_vfn);
464 g_free(infos[i].hash_result);
465 }
466 g_free(infos);
467}
468
469static bool skip_sample_ramblock(RAMBlock *block)
470{
471
472
473
474 if (qemu_ram_get_used_length(block) < (MIN_RAMBLOCK_SIZE << 10)) {
475 trace_skip_sample_ramblock(block->idstr,
476 qemu_ram_get_used_length(block));
477 return true;
478 }
479
480 return false;
481}
482
483static bool record_ramblock_hash_info(struct RamblockDirtyInfo **block_dinfo,
484 struct DirtyRateConfig config,
485 int *block_count)
486{
487 struct RamblockDirtyInfo *info = NULL;
488 struct RamblockDirtyInfo *dinfo = NULL;
489 RAMBlock *block = NULL;
490 int total_count = 0;
491 int index = 0;
492 bool ret = false;
493
494 RAMBLOCK_FOREACH_MIGRATABLE(block) {
495 if (skip_sample_ramblock(block)) {
496 continue;
497 }
498 total_count++;
499 }
500
501 dinfo = g_try_malloc0_n(total_count, sizeof(struct RamblockDirtyInfo));
502 if (dinfo == NULL) {
503 goto out;
504 }
505
506 RAMBLOCK_FOREACH_MIGRATABLE(block) {
507 if (skip_sample_ramblock(block)) {
508 continue;
509 }
510 if (index >= total_count) {
511 break;
512 }
513 info = &dinfo[index];
514 get_ramblock_dirty_info(block, info, &config);
515 if (!save_ramblock_hash(info)) {
516 goto out;
517 }
518 index++;
519 }
520 ret = true;
521
522out:
523 *block_count = index;
524 *block_dinfo = dinfo;
525 return ret;
526}
527
528static void calc_page_dirty_rate(struct RamblockDirtyInfo *info)
529{
530 uint32_t hash;
531 int i;
532
533 for (i = 0; i < info->sample_pages_count; i++) {
534 hash = get_ramblock_vfn_hash(info, info->sample_page_vfn[i]);
535 if (hash != info->hash_result[i]) {
536 trace_calc_page_dirty_rate(info->idstr, hash, info->hash_result[i]);
537 info->sample_dirty_count++;
538 }
539 }
540}
541
542static struct RamblockDirtyInfo *
543find_block_matched(RAMBlock *block, int count,
544 struct RamblockDirtyInfo *infos)
545{
546 int i;
547
548 for (i = 0; i < count; i++) {
549 if (!strcmp(infos[i].idstr, qemu_ram_get_idstr(block))) {
550 break;
551 }
552 }
553
554 if (i == count) {
555 return NULL;
556 }
557
558 if (infos[i].ramblock_addr != qemu_ram_get_host_addr(block) ||
559 infos[i].ramblock_pages !=
560 (qemu_ram_get_used_length(block) >> qemu_target_page_bits())) {
561 trace_find_page_matched(block->idstr);
562 return NULL;
563 }
564
565 return &infos[i];
566}
567
568static bool compare_page_hash_info(struct RamblockDirtyInfo *info,
569 int block_count)
570{
571 struct RamblockDirtyInfo *block_dinfo = NULL;
572 RAMBlock *block = NULL;
573
574 RAMBLOCK_FOREACH_MIGRATABLE(block) {
575 if (skip_sample_ramblock(block)) {
576 continue;
577 }
578 block_dinfo = find_block_matched(block, block_count, info);
579 if (block_dinfo == NULL) {
580 continue;
581 }
582 calc_page_dirty_rate(block_dinfo);
583 update_dirtyrate_stat(block_dinfo);
584 }
585
586 if (DirtyStat.page_sampling.total_sample_count == 0) {
587 return false;
588 }
589
590 return true;
591}
592
593static inline void record_dirtypages_bitmap(DirtyPageRecord *dirty_pages,
594 bool start)
595{
596 if (start) {
597 dirty_pages->start_pages = total_dirty_pages;
598 } else {
599 dirty_pages->end_pages = total_dirty_pages;
600 }
601}
602
603static inline void dirtyrate_manual_reset_protect(void)
604{
605 RAMBlock *block = NULL;
606
607 WITH_RCU_READ_LOCK_GUARD() {
608 RAMBLOCK_FOREACH_MIGRATABLE(block) {
609 memory_region_clear_dirty_bitmap(block->mr, 0,
610 block->used_length);
611 }
612 }
613}
614
615static void calculate_dirtyrate_dirty_bitmap(struct DirtyRateConfig config)
616{
617 int64_t start_time;
618 DirtyPageRecord dirty_pages;
619 Error *local_err = NULL;
620
621 bql_lock();
622 if (!memory_global_dirty_log_start(GLOBAL_DIRTY_DIRTY_RATE, &local_err)) {
623 error_report_err(local_err);
624 }
625
626
627
628
629
630
631
632 memory_global_dirty_log_sync(false);
633
634
635
636
637
638
639 dirtyrate_manual_reset_protect();
640 bql_unlock();
641
642 record_dirtypages_bitmap(&dirty_pages, true);
643
644 start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
645 DirtyStat.start_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) / 1000;
646
647 DirtyStat.calc_time_ms = dirty_stat_wait(config.calc_time_ms, start_time);
648
649
650
651
652
653
654 global_dirty_log_sync(GLOBAL_DIRTY_DIRTY_RATE, true);
655
656 record_dirtypages_bitmap(&dirty_pages, false);
657
658 DirtyStat.dirty_rate = do_calculate_dirtyrate(dirty_pages,
659 DirtyStat.calc_time_ms);
660}
661
662static void calculate_dirtyrate_dirty_ring(struct DirtyRateConfig config)
663{
664 uint64_t dirtyrate = 0;
665 uint64_t dirtyrate_sum = 0;
666 int i = 0;
667
668
669 global_dirty_log_change(GLOBAL_DIRTY_DIRTY_RATE, true);
670
671 DirtyStat.start_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) / 1000;
672
673
674 DirtyStat.calc_time_ms = vcpu_calculate_dirtyrate(config.calc_time_ms,
675 &DirtyStat.dirty_ring,
676 GLOBAL_DIRTY_DIRTY_RATE,
677 true);
678
679
680 for (i = 0; i < DirtyStat.dirty_ring.nvcpu; i++) {
681 dirtyrate = DirtyStat.dirty_ring.rates[i].dirty_rate;
682 DirtyStat.dirty_ring.rates[i].dirty_rate = dirtyrate;
683 dirtyrate_sum += dirtyrate;
684 }
685
686 DirtyStat.dirty_rate = dirtyrate_sum;
687}
688
689static void calculate_dirtyrate_sample_vm(struct DirtyRateConfig config)
690{
691 struct RamblockDirtyInfo *block_dinfo = NULL;
692 int block_count = 0;
693 int64_t initial_time;
694
695 rcu_read_lock();
696 initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
697 DirtyStat.start_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) / 1000;
698 if (!record_ramblock_hash_info(&block_dinfo, config, &block_count)) {
699 goto out;
700 }
701 rcu_read_unlock();
702
703 DirtyStat.calc_time_ms = dirty_stat_wait(config.calc_time_ms,
704 initial_time);
705
706 rcu_read_lock();
707 if (!compare_page_hash_info(block_dinfo, block_count)) {
708 goto out;
709 }
710
711 update_dirtyrate(DirtyStat.calc_time_ms);
712
713out:
714 rcu_read_unlock();
715 free_ramblock_dirty_info(block_dinfo, block_count);
716}
717
718static void calculate_dirtyrate(struct DirtyRateConfig config)
719{
720 if (config.mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) {
721 calculate_dirtyrate_dirty_bitmap(config);
722 } else if (config.mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) {
723 calculate_dirtyrate_dirty_ring(config);
724 } else {
725 calculate_dirtyrate_sample_vm(config);
726 }
727
728 trace_dirtyrate_calculate(DirtyStat.dirty_rate);
729}
730
731void *get_dirtyrate_thread(void *arg)
732{
733 struct DirtyRateConfig config = *(struct DirtyRateConfig *)arg;
734 int ret;
735 rcu_register_thread();
736
737 ret = dirtyrate_set_state(&CalculatingState, DIRTY_RATE_STATUS_UNSTARTED,
738 DIRTY_RATE_STATUS_MEASURING);
739 if (ret == -1) {
740 error_report("change dirtyrate state failed.");
741 return NULL;
742 }
743
744 calculate_dirtyrate(config);
745
746 ret = dirtyrate_set_state(&CalculatingState, DIRTY_RATE_STATUS_MEASURING,
747 DIRTY_RATE_STATUS_MEASURED);
748 if (ret == -1) {
749 error_report("change dirtyrate state failed.");
750 }
751
752 rcu_unregister_thread();
753 return NULL;
754}
755
756void qmp_calc_dirty_rate(int64_t calc_time,
757 bool has_calc_time_unit,
758 TimeUnit calc_time_unit,
759 bool has_sample_pages,
760 int64_t sample_pages,
761 bool has_mode,
762 DirtyRateMeasureMode mode,
763 Error **errp)
764{
765 static struct DirtyRateConfig config;
766 QemuThread thread;
767 int ret;
768
769
770
771
772 if (qatomic_read(&CalculatingState) == DIRTY_RATE_STATUS_MEASURING) {
773 error_setg(errp, "the dirty rate is already being measured.");
774 return;
775 }
776
777 int64_t calc_time_ms = convert_time_unit(
778 calc_time,
779 has_calc_time_unit ? calc_time_unit : TIME_UNIT_SECOND,
780 TIME_UNIT_MILLISECOND
781 );
782
783 if (!is_calc_time_valid(calc_time_ms)) {
784 error_setg(errp, "Calculation time is out of range [%dms, %dms].",
785 MIN_CALC_TIME_MS, MAX_CALC_TIME_MS);
786 return;
787 }
788
789 if (!has_mode) {
790 mode = DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING;
791 }
792
793 if (has_sample_pages && mode != DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING) {
794 error_setg(errp, "sample-pages is used only in page-sampling mode");
795 return;
796 }
797
798 if (has_sample_pages) {
799 if (!is_sample_pages_valid(sample_pages)) {
800 error_setg(errp, "sample-pages is out of range[%d, %d].",
801 MIN_SAMPLE_PAGE_COUNT,
802 MAX_SAMPLE_PAGE_COUNT);
803 return;
804 }
805 } else {
806 sample_pages = DIRTYRATE_DEFAULT_SAMPLE_PAGES;
807 }
808
809
810
811
812
813 if (((mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) &&
814 !kvm_dirty_ring_enabled()) ||
815 ((mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) &&
816 kvm_dirty_ring_enabled())) {
817 error_setg(errp, "mode %s is not enabled, use other method instead.",
818 DirtyRateMeasureMode_str(mode));
819 return;
820 }
821
822
823
824
825 ret = dirtyrate_set_state(&CalculatingState, CalculatingState,
826 DIRTY_RATE_STATUS_UNSTARTED);
827 if (ret == -1) {
828 error_setg(errp, "init dirty rate calculation state failed.");
829 return;
830 }
831
832 config.calc_time_ms = calc_time_ms;
833 config.sample_pages_per_gigabytes = sample_pages;
834 config.mode = mode;
835
836 cleanup_dirtyrate_stat(config);
837
838
839
840
841
842 dirtyrate_mode = mode;
843
844 init_dirtyrate_stat(config);
845
846 qemu_thread_create(&thread, MIGRATION_THREAD_DIRTY_RATE,
847 get_dirtyrate_thread, (void *)&config,
848 QEMU_THREAD_DETACHED);
849}
850
851
852struct DirtyRateInfo *qmp_query_dirty_rate(bool has_calc_time_unit,
853 TimeUnit calc_time_unit,
854 Error **errp)
855{
856 return query_dirty_rate_info(
857 has_calc_time_unit ? calc_time_unit : TIME_UNIT_SECOND);
858}
859
860void hmp_info_dirty_rate(Monitor *mon, const QDict *qdict)
861{
862 DirtyRateInfo *info = query_dirty_rate_info(TIME_UNIT_SECOND);
863
864 monitor_printf(mon, "Status: %s\n",
865 DirtyRateStatus_str(info->status));
866 monitor_printf(mon, "Start Time: %"PRIi64" (ms)\n",
867 info->start_time);
868 if (info->mode == DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING) {
869 monitor_printf(mon, "Sample Pages: %"PRIu64" (per GB)\n",
870 info->sample_pages);
871 }
872 monitor_printf(mon, "Period: %"PRIi64" (sec)\n",
873 info->calc_time);
874 monitor_printf(mon, "Mode: %s\n",
875 DirtyRateMeasureMode_str(info->mode));
876 monitor_printf(mon, "Dirty rate: ");
877 if (info->has_dirty_rate) {
878 monitor_printf(mon, "%"PRIi64" (MB/s)\n", info->dirty_rate);
879 if (info->has_vcpu_dirty_rate) {
880 DirtyRateVcpuList *rate, *head = info->vcpu_dirty_rate;
881 for (rate = head; rate != NULL; rate = rate->next) {
882 monitor_printf(mon, "vcpu[%"PRIi64"], Dirty rate: %"PRIi64
883 " (MB/s)\n", rate->value->id,
884 rate->value->dirty_rate);
885 }
886 }
887 } else {
888 monitor_printf(mon, "(not ready)\n");
889 }
890
891 qapi_free_DirtyRateVcpuList(info->vcpu_dirty_rate);
892 g_free(info);
893}
894
895void hmp_calc_dirty_rate(Monitor *mon, const QDict *qdict)
896{
897 int64_t sec = qdict_get_try_int(qdict, "second", 0);
898 int64_t sample_pages = qdict_get_try_int(qdict, "sample_pages_per_GB", -1);
899 bool has_sample_pages = (sample_pages != -1);
900 bool dirty_ring = qdict_get_try_bool(qdict, "dirty_ring", false);
901 bool dirty_bitmap = qdict_get_try_bool(qdict, "dirty_bitmap", false);
902 DirtyRateMeasureMode mode = DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING;
903 Error *err = NULL;
904
905 if (!sec) {
906 monitor_printf(mon, "Incorrect period length specified!\n");
907 return;
908 }
909
910 if (dirty_ring && dirty_bitmap) {
911 monitor_printf(mon, "Either dirty ring or dirty bitmap "
912 "can be specified!\n");
913 return;
914 }
915
916 if (dirty_bitmap) {
917 mode = DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP;
918 } else if (dirty_ring) {
919 mode = DIRTY_RATE_MEASURE_MODE_DIRTY_RING;
920 }
921
922 qmp_calc_dirty_rate(sec,
923 false, TIME_UNIT_SECOND,
924 has_sample_pages, sample_pages,
925 true, mode,
926 &err);
927 if (err) {
928 hmp_handle_error(mon, err);
929 return;
930 }
931
932 monitor_printf(mon, "Starting dirty rate measurement with period %"PRIi64
933 " seconds\n", sec);
934 monitor_printf(mon, "[Please use 'info dirty_rate' to check results]\n");
935}
936
