]>
Commit | Line | Data |
---|---|---|
cc2b33ea HH |
1 | /* |
2 | * Dirty page rate limit implementation code | |
3 | * | |
4 | * Copyright (c) 2022 CHINA TELECOM CO.,LTD. | |
5 | * | |
6 | * Authors: | |
7 | * Hyman Huang(黄勇) <huangy81@chinatelecom.cn> | |
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" | |
cc2b33ea HH |
14 | #include "qemu/main-loop.h" |
15 | #include "qapi/qapi-commands-migration.h" | |
f3b2e38c HH |
16 | #include "qapi/qmp/qdict.h" |
17 | #include "qapi/error.h" | |
cc2b33ea HH |
18 | #include "sysemu/dirtyrate.h" |
19 | #include "sysemu/dirtylimit.h" | |
f3b2e38c HH |
20 | #include "monitor/hmp.h" |
21 | #include "monitor/monitor.h" | |
cc2b33ea | 22 | #include "exec/memory.h" |
30ee29fd | 23 | #include "exec/target_page.h" |
cc2b33ea | 24 | #include "hw/boards.h" |
baa60983 HH |
25 | #include "sysemu/kvm.h" |
26 | #include "trace.h" | |
dc623955 HH |
27 | #include "migration/misc.h" |
28 | #include "migration/migration.h" | |
29 | #include "migration/options.h" | |
baa60983 HH |
30 | |
31 | /* | |
32 | * Dirtylimit stop working if dirty page rate error | |
33 | * value less than DIRTYLIMIT_TOLERANCE_RANGE | |
34 | */ | |
35 | #define DIRTYLIMIT_TOLERANCE_RANGE 25 /* MB/s */ | |
36 | /* | |
37 | * Plus or minus vcpu sleep time linearly if dirty | |
38 | * page rate error value percentage over | |
39 | * DIRTYLIMIT_LINEAR_ADJUSTMENT_PCT. | |
40 | * Otherwise, plus or minus a fixed vcpu sleep time. | |
41 | */ | |
42 | #define DIRTYLIMIT_LINEAR_ADJUSTMENT_PCT 50 | |
43 | /* | |
44 | * Max vcpu sleep time percentage during a cycle | |
45 | * composed of dirty ring full and sleep time. | |
46 | */ | |
47 | #define DIRTYLIMIT_THROTTLE_PCT_MAX 99 | |
cc2b33ea HH |
48 | |
49 | struct { | |
50 | VcpuStat stat; | |
51 | bool running; | |
52 | QemuThread thread; | |
53 | } *vcpu_dirty_rate_stat; | |
54 | ||
baa60983 HH |
55 | typedef struct VcpuDirtyLimitState { |
56 | int cpu_index; | |
57 | bool enabled; | |
58 | /* | |
59 | * Quota dirty page rate, unit is MB/s | |
60 | * zero if not enabled. | |
61 | */ | |
62 | uint64_t quota; | |
63 | } VcpuDirtyLimitState; | |
64 | ||
65 | struct { | |
66 | VcpuDirtyLimitState *states; | |
67 | /* Max cpus number configured by user */ | |
68 | int max_cpus; | |
69 | /* Number of vcpu under dirtylimit */ | |
70 | int limited_nvcpu; | |
71 | } *dirtylimit_state; | |
72 | ||
73 | /* protect dirtylimit_state */ | |
74 | static QemuMutex dirtylimit_mutex; | |
75 | ||
76 | /* dirtylimit thread quit if dirtylimit_quit is true */ | |
77 | static bool dirtylimit_quit; | |
78 | ||
cc2b33ea HH |
79 | static void vcpu_dirty_rate_stat_collect(void) |
80 | { | |
dc623955 | 81 | MigrationState *s = migrate_get_current(); |
cc2b33ea HH |
82 | VcpuStat stat; |
83 | int i = 0; | |
dc623955 HH |
84 | int64_t period = DIRTYLIMIT_CALC_TIME_MS; |
85 | ||
86 | if (migrate_dirty_limit() && | |
87 | migration_is_active(s)) { | |
88 | period = s->parameters.x_vcpu_dirty_limit_period; | |
89 | } | |
cc2b33ea HH |
90 | |
91 | /* calculate vcpu dirtyrate */ | |
dc623955 HH |
92 | vcpu_calculate_dirtyrate(period, |
93 | &stat, | |
94 | GLOBAL_DIRTY_LIMIT, | |
95 | false); | |
cc2b33ea HH |
96 | |
97 | for (i = 0; i < stat.nvcpu; i++) { | |
98 | vcpu_dirty_rate_stat->stat.rates[i].id = i; | |
99 | vcpu_dirty_rate_stat->stat.rates[i].dirty_rate = | |
100 | stat.rates[i].dirty_rate; | |
101 | } | |
102 | ||
19b14cea | 103 | g_free(stat.rates); |
cc2b33ea HH |
104 | } |
105 | ||
106 | static void *vcpu_dirty_rate_stat_thread(void *opaque) | |
107 | { | |
108 | rcu_register_thread(); | |
109 | ||
110 | /* start log sync */ | |
111 | global_dirty_log_change(GLOBAL_DIRTY_LIMIT, true); | |
112 | ||
113 | while (qatomic_read(&vcpu_dirty_rate_stat->running)) { | |
114 | vcpu_dirty_rate_stat_collect(); | |
baa60983 HH |
115 | if (dirtylimit_in_service()) { |
116 | dirtylimit_process(); | |
117 | } | |
cc2b33ea HH |
118 | } |
119 | ||
120 | /* stop log sync */ | |
121 | global_dirty_log_change(GLOBAL_DIRTY_LIMIT, false); | |
122 | ||
123 | rcu_unregister_thread(); | |
124 | return NULL; | |
125 | } | |
126 | ||
127 | int64_t vcpu_dirty_rate_get(int cpu_index) | |
128 | { | |
129 | DirtyRateVcpu *rates = vcpu_dirty_rate_stat->stat.rates; | |
130 | return qatomic_read_i64(&rates[cpu_index].dirty_rate); | |
131 | } | |
132 | ||
133 | void vcpu_dirty_rate_stat_start(void) | |
134 | { | |
135 | if (qatomic_read(&vcpu_dirty_rate_stat->running)) { | |
136 | return; | |
137 | } | |
138 | ||
139 | qatomic_set(&vcpu_dirty_rate_stat->running, 1); | |
140 | qemu_thread_create(&vcpu_dirty_rate_stat->thread, | |
141 | "dirtyrate-stat", | |
142 | vcpu_dirty_rate_stat_thread, | |
143 | NULL, | |
144 | QEMU_THREAD_JOINABLE); | |
145 | } | |
146 | ||
147 | void vcpu_dirty_rate_stat_stop(void) | |
148 | { | |
149 | qatomic_set(&vcpu_dirty_rate_stat->running, 0); | |
baa60983 | 150 | dirtylimit_state_unlock(); |
195801d7 | 151 | bql_unlock(); |
cc2b33ea | 152 | qemu_thread_join(&vcpu_dirty_rate_stat->thread); |
195801d7 | 153 | bql_lock(); |
baa60983 | 154 | dirtylimit_state_lock(); |
cc2b33ea HH |
155 | } |
156 | ||
157 | void vcpu_dirty_rate_stat_initialize(void) | |
158 | { | |
159 | MachineState *ms = MACHINE(qdev_get_machine()); | |
160 | int max_cpus = ms->smp.max_cpus; | |
161 | ||
162 | vcpu_dirty_rate_stat = | |
163 | g_malloc0(sizeof(*vcpu_dirty_rate_stat)); | |
164 | ||
165 | vcpu_dirty_rate_stat->stat.nvcpu = max_cpus; | |
166 | vcpu_dirty_rate_stat->stat.rates = | |
c5e8d518 | 167 | g_new0(DirtyRateVcpu, max_cpus); |
cc2b33ea HH |
168 | |
169 | vcpu_dirty_rate_stat->running = false; | |
170 | } | |
171 | ||
172 | void vcpu_dirty_rate_stat_finalize(void) | |
173 | { | |
19b14cea | 174 | g_free(vcpu_dirty_rate_stat->stat.rates); |
cc2b33ea HH |
175 | vcpu_dirty_rate_stat->stat.rates = NULL; |
176 | ||
19b14cea | 177 | g_free(vcpu_dirty_rate_stat); |
cc2b33ea HH |
178 | vcpu_dirty_rate_stat = NULL; |
179 | } | |
baa60983 HH |
180 | |
181 | void dirtylimit_state_lock(void) | |
182 | { | |
183 | qemu_mutex_lock(&dirtylimit_mutex); | |
184 | } | |
185 | ||
186 | void dirtylimit_state_unlock(void) | |
187 | { | |
188 | qemu_mutex_unlock(&dirtylimit_mutex); | |
189 | } | |
190 | ||
191 | static void | |
192 | __attribute__((__constructor__)) dirtylimit_mutex_init(void) | |
193 | { | |
194 | qemu_mutex_init(&dirtylimit_mutex); | |
195 | } | |
196 | ||
197 | static inline VcpuDirtyLimitState *dirtylimit_vcpu_get_state(int cpu_index) | |
198 | { | |
199 | return &dirtylimit_state->states[cpu_index]; | |
200 | } | |
201 | ||
202 | void dirtylimit_state_initialize(void) | |
203 | { | |
204 | MachineState *ms = MACHINE(qdev_get_machine()); | |
205 | int max_cpus = ms->smp.max_cpus; | |
206 | int i; | |
207 | ||
208 | dirtylimit_state = g_malloc0(sizeof(*dirtylimit_state)); | |
209 | ||
210 | dirtylimit_state->states = | |
c5e8d518 | 211 | g_new0(VcpuDirtyLimitState, max_cpus); |
baa60983 HH |
212 | |
213 | for (i = 0; i < max_cpus; i++) { | |
214 | dirtylimit_state->states[i].cpu_index = i; | |
215 | } | |
216 | ||
217 | dirtylimit_state->max_cpus = max_cpus; | |
218 | trace_dirtylimit_state_initialize(max_cpus); | |
219 | } | |
220 | ||
221 | void dirtylimit_state_finalize(void) | |
222 | { | |
19b14cea | 223 | g_free(dirtylimit_state->states); |
baa60983 HH |
224 | dirtylimit_state->states = NULL; |
225 | ||
19b14cea | 226 | g_free(dirtylimit_state); |
baa60983 HH |
227 | dirtylimit_state = NULL; |
228 | ||
229 | trace_dirtylimit_state_finalize(); | |
230 | } | |
231 | ||
232 | bool dirtylimit_in_service(void) | |
233 | { | |
234 | return !!dirtylimit_state; | |
235 | } | |
236 | ||
237 | bool dirtylimit_vcpu_index_valid(int cpu_index) | |
238 | { | |
239 | MachineState *ms = MACHINE(qdev_get_machine()); | |
240 | ||
241 | return !(cpu_index < 0 || | |
242 | cpu_index >= ms->smp.max_cpus); | |
243 | } | |
244 | ||
6a6447fe | 245 | static uint64_t dirtylimit_dirty_ring_full_time(uint64_t dirtyrate) |
baa60983 HH |
246 | { |
247 | static uint64_t max_dirtyrate; | |
beeda9b7 | 248 | uint64_t dirty_ring_size_MiB; |
6a6447fe | 249 | |
beeda9b7 | 250 | dirty_ring_size_MiB = qemu_target_pages_to_MiB(kvm_dirty_ring_size()); |
baa60983 HH |
251 | |
252 | if (max_dirtyrate < dirtyrate) { | |
253 | max_dirtyrate = dirtyrate; | |
254 | } | |
255 | ||
beeda9b7 | 256 | return dirty_ring_size_MiB * 1000000 / max_dirtyrate; |
baa60983 HH |
257 | } |
258 | ||
259 | static inline bool dirtylimit_done(uint64_t quota, | |
260 | uint64_t current) | |
261 | { | |
262 | uint64_t min, max; | |
263 | ||
264 | min = MIN(quota, current); | |
265 | max = MAX(quota, current); | |
266 | ||
267 | return ((max - min) <= DIRTYLIMIT_TOLERANCE_RANGE) ? true : false; | |
268 | } | |
269 | ||
270 | static inline bool | |
271 | dirtylimit_need_linear_adjustment(uint64_t quota, | |
272 | uint64_t current) | |
273 | { | |
274 | uint64_t min, max; | |
275 | ||
276 | min = MIN(quota, current); | |
277 | max = MAX(quota, current); | |
278 | ||
279 | return ((max - min) * 100 / max) > DIRTYLIMIT_LINEAR_ADJUSTMENT_PCT; | |
280 | } | |
281 | ||
282 | static void dirtylimit_set_throttle(CPUState *cpu, | |
283 | uint64_t quota, | |
284 | uint64_t current) | |
285 | { | |
286 | int64_t ring_full_time_us = 0; | |
287 | uint64_t sleep_pct = 0; | |
288 | uint64_t throttle_us = 0; | |
289 | ||
290 | if (current == 0) { | |
291 | cpu->throttle_us_per_full = 0; | |
292 | return; | |
293 | } | |
294 | ||
295 | ring_full_time_us = dirtylimit_dirty_ring_full_time(current); | |
296 | ||
297 | if (dirtylimit_need_linear_adjustment(quota, current)) { | |
298 | if (quota < current) { | |
299 | sleep_pct = (current - quota) * 100 / current; | |
300 | throttle_us = | |
301 | ring_full_time_us * sleep_pct / (double)(100 - sleep_pct); | |
302 | cpu->throttle_us_per_full += throttle_us; | |
303 | } else { | |
304 | sleep_pct = (quota - current) * 100 / quota; | |
305 | throttle_us = | |
306 | ring_full_time_us * sleep_pct / (double)(100 - sleep_pct); | |
307 | cpu->throttle_us_per_full -= throttle_us; | |
308 | } | |
309 | ||
310 | trace_dirtylimit_throttle_pct(cpu->cpu_index, | |
311 | sleep_pct, | |
312 | throttle_us); | |
313 | } else { | |
314 | if (quota < current) { | |
315 | cpu->throttle_us_per_full += ring_full_time_us / 10; | |
316 | } else { | |
317 | cpu->throttle_us_per_full -= ring_full_time_us / 10; | |
318 | } | |
319 | } | |
320 | ||
321 | /* | |
322 | * TODO: in the big kvm_dirty_ring_size case (eg: 65536, or other scenario), | |
323 | * current dirty page rate may never reach the quota, we should stop | |
324 | * increasing sleep time? | |
325 | */ | |
326 | cpu->throttle_us_per_full = MIN(cpu->throttle_us_per_full, | |
327 | ring_full_time_us * DIRTYLIMIT_THROTTLE_PCT_MAX); | |
328 | ||
329 | cpu->throttle_us_per_full = MAX(cpu->throttle_us_per_full, 0); | |
330 | } | |
331 | ||
332 | static void dirtylimit_adjust_throttle(CPUState *cpu) | |
333 | { | |
334 | uint64_t quota = 0; | |
335 | uint64_t current = 0; | |
336 | int cpu_index = cpu->cpu_index; | |
337 | ||
338 | quota = dirtylimit_vcpu_get_state(cpu_index)->quota; | |
339 | current = vcpu_dirty_rate_get(cpu_index); | |
340 | ||
341 | if (!dirtylimit_done(quota, current)) { | |
342 | dirtylimit_set_throttle(cpu, quota, current); | |
343 | } | |
344 | ||
345 | return; | |
346 | } | |
347 | ||
348 | void dirtylimit_process(void) | |
349 | { | |
350 | CPUState *cpu; | |
351 | ||
352 | if (!qatomic_read(&dirtylimit_quit)) { | |
353 | dirtylimit_state_lock(); | |
354 | ||
355 | if (!dirtylimit_in_service()) { | |
356 | dirtylimit_state_unlock(); | |
357 | return; | |
358 | } | |
359 | ||
360 | CPU_FOREACH(cpu) { | |
361 | if (!dirtylimit_vcpu_get_state(cpu->cpu_index)->enabled) { | |
362 | continue; | |
363 | } | |
364 | dirtylimit_adjust_throttle(cpu); | |
365 | } | |
366 | dirtylimit_state_unlock(); | |
367 | } | |
368 | } | |
369 | ||
370 | void dirtylimit_change(bool start) | |
371 | { | |
372 | if (start) { | |
373 | qatomic_set(&dirtylimit_quit, 0); | |
374 | } else { | |
375 | qatomic_set(&dirtylimit_quit, 1); | |
376 | } | |
377 | } | |
378 | ||
379 | void dirtylimit_set_vcpu(int cpu_index, | |
380 | uint64_t quota, | |
381 | bool enable) | |
382 | { | |
383 | trace_dirtylimit_set_vcpu(cpu_index, quota); | |
384 | ||
385 | if (enable) { | |
386 | dirtylimit_state->states[cpu_index].quota = quota; | |
387 | if (!dirtylimit_vcpu_get_state(cpu_index)->enabled) { | |
388 | dirtylimit_state->limited_nvcpu++; | |
389 | } | |
390 | } else { | |
391 | dirtylimit_state->states[cpu_index].quota = 0; | |
392 | if (dirtylimit_state->states[cpu_index].enabled) { | |
393 | dirtylimit_state->limited_nvcpu--; | |
394 | } | |
395 | } | |
396 | ||
397 | dirtylimit_state->states[cpu_index].enabled = enable; | |
398 | } | |
399 | ||
400 | void dirtylimit_set_all(uint64_t quota, | |
401 | bool enable) | |
402 | { | |
403 | MachineState *ms = MACHINE(qdev_get_machine()); | |
404 | int max_cpus = ms->smp.max_cpus; | |
405 | int i; | |
406 | ||
407 | for (i = 0; i < max_cpus; i++) { | |
408 | dirtylimit_set_vcpu(i, quota, enable); | |
409 | } | |
410 | } | |
411 | ||
412 | void dirtylimit_vcpu_execute(CPUState *cpu) | |
413 | { | |
cce10a1f HH |
414 | if (cpu->throttle_us_per_full) { |
415 | dirtylimit_state_lock(); | |
416 | ||
417 | if (dirtylimit_in_service() && | |
418 | dirtylimit_vcpu_get_state(cpu->cpu_index)->enabled) { | |
419 | dirtylimit_state_unlock(); | |
420 | trace_dirtylimit_vcpu_execute(cpu->cpu_index, | |
421 | cpu->throttle_us_per_full); | |
422 | ||
423 | g_usleep(cpu->throttle_us_per_full); | |
424 | return; | |
425 | } | |
426 | ||
427 | dirtylimit_state_unlock(); | |
baa60983 HH |
428 | } |
429 | } | |
f3b2e38c HH |
430 | |
431 | static void dirtylimit_init(void) | |
432 | { | |
433 | dirtylimit_state_initialize(); | |
434 | dirtylimit_change(true); | |
435 | vcpu_dirty_rate_stat_initialize(); | |
436 | vcpu_dirty_rate_stat_start(); | |
437 | } | |
438 | ||
439 | static void dirtylimit_cleanup(void) | |
440 | { | |
441 | vcpu_dirty_rate_stat_stop(); | |
442 | vcpu_dirty_rate_stat_finalize(); | |
443 | dirtylimit_change(false); | |
444 | dirtylimit_state_finalize(); | |
445 | } | |
446 | ||
acac51ba HH |
447 | /* |
448 | * dirty page rate limit is not allowed to set if migration | |
449 | * is running with dirty-limit capability enabled. | |
450 | */ | |
451 | static bool dirtylimit_is_allowed(void) | |
452 | { | |
453 | MigrationState *ms = migrate_get_current(); | |
454 | ||
455 | if (migration_is_running(ms->state) && | |
456 | (!qemu_thread_is_self(&ms->thread)) && | |
457 | migrate_dirty_limit() && | |
458 | dirtylimit_in_service()) { | |
459 | return false; | |
460 | } | |
461 | return true; | |
462 | } | |
463 | ||
f3b2e38c HH |
464 | void qmp_cancel_vcpu_dirty_limit(bool has_cpu_index, |
465 | int64_t cpu_index, | |
466 | Error **errp) | |
467 | { | |
468 | if (!kvm_enabled() || !kvm_dirty_ring_enabled()) { | |
469 | return; | |
470 | } | |
471 | ||
472 | if (has_cpu_index && !dirtylimit_vcpu_index_valid(cpu_index)) { | |
473 | error_setg(errp, "incorrect cpu index specified"); | |
474 | return; | |
475 | } | |
476 | ||
acac51ba HH |
477 | if (!dirtylimit_is_allowed()) { |
478 | error_setg(errp, "can't cancel dirty page rate limit while" | |
479 | " migration is running"); | |
480 | return; | |
481 | } | |
482 | ||
f3b2e38c HH |
483 | if (!dirtylimit_in_service()) { |
484 | return; | |
485 | } | |
486 | ||
487 | dirtylimit_state_lock(); | |
488 | ||
489 | if (has_cpu_index) { | |
490 | dirtylimit_set_vcpu(cpu_index, 0, false); | |
491 | } else { | |
492 | dirtylimit_set_all(0, false); | |
493 | } | |
494 | ||
495 | if (!dirtylimit_state->limited_nvcpu) { | |
496 | dirtylimit_cleanup(); | |
497 | } | |
498 | ||
499 | dirtylimit_state_unlock(); | |
500 | } | |
501 | ||
502 | void hmp_cancel_vcpu_dirty_limit(Monitor *mon, const QDict *qdict) | |
503 | { | |
504 | int64_t cpu_index = qdict_get_try_int(qdict, "cpu_index", -1); | |
505 | Error *err = NULL; | |
506 | ||
507 | qmp_cancel_vcpu_dirty_limit(!!(cpu_index != -1), cpu_index, &err); | |
508 | if (err) { | |
509 | hmp_handle_error(mon, err); | |
510 | return; | |
511 | } | |
512 | ||
513 | monitor_printf(mon, "[Please use 'info vcpu_dirty_limit' to query " | |
514 | "dirty limit for virtual CPU]\n"); | |
515 | } | |
516 | ||
517 | void qmp_set_vcpu_dirty_limit(bool has_cpu_index, | |
518 | int64_t cpu_index, | |
519 | uint64_t dirty_rate, | |
520 | Error **errp) | |
521 | { | |
522 | if (!kvm_enabled() || !kvm_dirty_ring_enabled()) { | |
523 | error_setg(errp, "dirty page limit feature requires KVM with" | |
524 | " accelerator property 'dirty-ring-size' set'"); | |
525 | return; | |
526 | } | |
527 | ||
528 | if (has_cpu_index && !dirtylimit_vcpu_index_valid(cpu_index)) { | |
529 | error_setg(errp, "incorrect cpu index specified"); | |
530 | return; | |
531 | } | |
532 | ||
acac51ba HH |
533 | if (!dirtylimit_is_allowed()) { |
534 | error_setg(errp, "can't set dirty page rate limit while" | |
535 | " migration is running"); | |
536 | return; | |
537 | } | |
538 | ||
f3b2e38c HH |
539 | if (!dirty_rate) { |
540 | qmp_cancel_vcpu_dirty_limit(has_cpu_index, cpu_index, errp); | |
541 | return; | |
542 | } | |
543 | ||
544 | dirtylimit_state_lock(); | |
545 | ||
546 | if (!dirtylimit_in_service()) { | |
547 | dirtylimit_init(); | |
548 | } | |
549 | ||
550 | if (has_cpu_index) { | |
551 | dirtylimit_set_vcpu(cpu_index, dirty_rate, true); | |
552 | } else { | |
553 | dirtylimit_set_all(dirty_rate, true); | |
554 | } | |
555 | ||
556 | dirtylimit_state_unlock(); | |
557 | } | |
558 | ||
559 | void hmp_set_vcpu_dirty_limit(Monitor *mon, const QDict *qdict) | |
560 | { | |
561 | int64_t dirty_rate = qdict_get_int(qdict, "dirty_rate"); | |
562 | int64_t cpu_index = qdict_get_try_int(qdict, "cpu_index", -1); | |
563 | Error *err = NULL; | |
564 | ||
140e5a76 HH |
565 | if (dirty_rate < 0) { |
566 | error_setg(&err, "invalid dirty page limit %" PRId64, dirty_rate); | |
567 | goto out; | |
f3b2e38c HH |
568 | } |
569 | ||
140e5a76 HH |
570 | qmp_set_vcpu_dirty_limit(!!(cpu_index != -1), cpu_index, dirty_rate, &err); |
571 | ||
572 | out: | |
573 | hmp_handle_error(mon, err); | |
f3b2e38c HH |
574 | } |
575 | ||
15699cf5 HH |
576 | /* Return the max throttle time of each virtual CPU */ |
577 | uint64_t dirtylimit_throttle_time_per_round(void) | |
578 | { | |
579 | CPUState *cpu; | |
580 | int64_t max = 0; | |
581 | ||
582 | CPU_FOREACH(cpu) { | |
583 | if (cpu->throttle_us_per_full > max) { | |
584 | max = cpu->throttle_us_per_full; | |
585 | } | |
586 | } | |
587 | ||
588 | return max; | |
589 | } | |
590 | ||
591 | /* | |
592 | * Estimate average dirty ring full time of each virtaul CPU. | |
593 | * Return 0 if guest doesn't dirty memory. | |
594 | */ | |
595 | uint64_t dirtylimit_ring_full_time(void) | |
596 | { | |
597 | CPUState *cpu; | |
598 | uint64_t curr_rate = 0; | |
599 | int nvcpus = 0; | |
600 | ||
601 | CPU_FOREACH(cpu) { | |
602 | if (cpu->running) { | |
603 | nvcpus++; | |
604 | curr_rate += vcpu_dirty_rate_get(cpu->cpu_index); | |
605 | } | |
606 | } | |
607 | ||
608 | if (!curr_rate || !nvcpus) { | |
609 | return 0; | |
610 | } | |
611 | ||
612 | return dirtylimit_dirty_ring_full_time(curr_rate / nvcpus); | |
613 | } | |
614 | ||
f3b2e38c HH |
615 | static struct DirtyLimitInfo *dirtylimit_query_vcpu(int cpu_index) |
616 | { | |
617 | DirtyLimitInfo *info = NULL; | |
618 | ||
619 | info = g_malloc0(sizeof(*info)); | |
620 | info->cpu_index = cpu_index; | |
621 | info->limit_rate = dirtylimit_vcpu_get_state(cpu_index)->quota; | |
622 | info->current_rate = vcpu_dirty_rate_get(cpu_index); | |
623 | ||
624 | return info; | |
625 | } | |
626 | ||
627 | static struct DirtyLimitInfoList *dirtylimit_query_all(void) | |
628 | { | |
629 | int i, index; | |
630 | DirtyLimitInfo *info = NULL; | |
631 | DirtyLimitInfoList *head = NULL, **tail = &head; | |
632 | ||
633 | dirtylimit_state_lock(); | |
634 | ||
635 | if (!dirtylimit_in_service()) { | |
636 | dirtylimit_state_unlock(); | |
637 | return NULL; | |
638 | } | |
639 | ||
640 | for (i = 0; i < dirtylimit_state->max_cpus; i++) { | |
641 | index = dirtylimit_state->states[i].cpu_index; | |
642 | if (dirtylimit_vcpu_get_state(index)->enabled) { | |
643 | info = dirtylimit_query_vcpu(index); | |
644 | QAPI_LIST_APPEND(tail, info); | |
645 | } | |
646 | } | |
647 | ||
648 | dirtylimit_state_unlock(); | |
649 | ||
650 | return head; | |
651 | } | |
652 | ||
653 | struct DirtyLimitInfoList *qmp_query_vcpu_dirty_limit(Error **errp) | |
654 | { | |
f3b2e38c HH |
655 | return dirtylimit_query_all(); |
656 | } | |
657 | ||
658 | void hmp_info_vcpu_dirty_limit(Monitor *mon, const QDict *qdict) | |
659 | { | |
58b4def2 | 660 | DirtyLimitInfoList *info; |
661 | g_autoptr(DirtyLimitInfoList) head = NULL; | |
f3b2e38c HH |
662 | Error *err = NULL; |
663 | ||
664 | if (!dirtylimit_in_service()) { | |
665 | monitor_printf(mon, "Dirty page limit not enabled!\n"); | |
666 | return; | |
667 | } | |
668 | ||
58b4def2 | 669 | head = qmp_query_vcpu_dirty_limit(&err); |
f3b2e38c HH |
670 | if (err) { |
671 | hmp_handle_error(mon, err); | |
672 | return; | |
673 | } | |
674 | ||
58b4def2 | 675 | for (info = head; info != NULL; info = info->next) { |
f3b2e38c HH |
676 | monitor_printf(mon, "vcpu[%"PRIi64"], limit rate %"PRIi64 " (MB/s)," |
677 | " current rate %"PRIi64 " (MB/s)\n", | |
58b4def2 | 678 | info->value->cpu_index, |
679 | info->value->limit_rate, | |
680 | info->value->current_rate); | |
f3b2e38c | 681 | } |
f3b2e38c | 682 | } |