Commit | Line | Data |
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f2a2ce0e HL |
1 | #include <math.h> |
2 | #include "json.h" | |
3 | #include "idletime.h" | |
4 | ||
5 | static volatile struct idle_prof_common ipc; | |
6 | ||
680b5abc JA |
7 | /* |
8 | * Get time to complete an unit work on a particular cpu. | |
f2a2ce0e HL |
9 | * The minimum number in CALIBRATE_RUNS runs is returned. |
10 | */ | |
11 | static double calibrate_unit(unsigned char *data) | |
12 | { | |
13 | unsigned long t, i, j, k; | |
8b6a404c | 14 | struct timespec tps; |
f2a2ce0e HL |
15 | double tunit = 0.0; |
16 | ||
680b5abc | 17 | for (i = 0; i < CALIBRATE_RUNS; i++) { |
f2a2ce0e HL |
18 | |
19 | fio_gettime(&tps, NULL); | |
20 | /* scale for less variance */ | |
680b5abc | 21 | for (j = 0; j < CALIBRATE_SCALE; j++) { |
f2a2ce0e HL |
22 | /* unit of work */ |
23 | for (k=0; k < page_size; k++) { | |
680b5abc JA |
24 | data[(k + j) % page_size] = k % 256; |
25 | /* | |
26 | * we won't see STOP here. this is to match | |
f2a2ce0e HL |
27 | * the same statement in the profiling loop. |
28 | */ | |
29 | if (ipc.status == IDLE_PROF_STATUS_PROF_STOP) | |
30 | return 0.0; | |
31 | } | |
32 | } | |
33 | ||
34 | t = utime_since_now(&tps); | |
35 | if (!t) | |
36 | continue; | |
37 | ||
38 | /* get the minimum time to complete CALIBRATE_SCALE units */ | |
680b5abc | 39 | if ((i == 0) || ((double)t < tunit)) |
f2a2ce0e HL |
40 | tunit = (double)t; |
41 | } | |
42 | ||
680b5abc | 43 | return tunit / CALIBRATE_SCALE; |
f2a2ce0e HL |
44 | } |
45 | ||
54ed125b JA |
46 | static void free_cpu_affinity(struct idle_prof_thread *ipt) |
47 | { | |
48 | #if defined(FIO_HAVE_CPU_AFFINITY) | |
49 | fio_cpuset_exit(&ipt->cpu_mask); | |
50 | #endif | |
51 | } | |
52 | ||
59358c8e JA |
53 | static int set_cpu_affinity(struct idle_prof_thread *ipt) |
54 | { | |
55 | #if defined(FIO_HAVE_CPU_AFFINITY) | |
54ed125b JA |
56 | if (fio_cpuset_init(&ipt->cpu_mask)) { |
57 | log_err("fio: cpuset init failed\n"); | |
58 | return -1; | |
59 | } | |
59358c8e | 60 | |
54ed125b | 61 | fio_cpu_set(&ipt->cpu_mask, ipt->cpu); |
59358c8e | 62 | |
54ed125b | 63 | if (fio_setaffinity(gettid(), ipt->cpu_mask)) { |
59358c8e | 64 | log_err("fio: fio_setaffinity failed\n"); |
54ed125b | 65 | fio_cpuset_exit(&ipt->cpu_mask); |
59358c8e JA |
66 | return -1; |
67 | } | |
68 | ||
69 | return 0; | |
70 | #else | |
71 | log_err("fio: fio_setaffinity not supported\n"); | |
72 | return -1; | |
73 | #endif | |
74 | } | |
75 | ||
f2a2ce0e HL |
76 | static void *idle_prof_thread_fn(void *data) |
77 | { | |
78 | int retval; | |
79 | unsigned long j, k; | |
80 | struct idle_prof_thread *ipt = data; | |
81 | ||
82 | /* wait for all threads are spawned */ | |
83 | pthread_mutex_lock(&ipt->init_lock); | |
84 | ||
85 | /* exit if any other thread failed to start */ | |
d5b351d4 JA |
86 | if (ipc.status == IDLE_PROF_STATUS_ABORT) { |
87 | pthread_mutex_unlock(&ipt->init_lock); | |
f2a2ce0e | 88 | return NULL; |
d5b351d4 | 89 | } |
f2a2ce0e | 90 | |
59358c8e | 91 | retval = set_cpu_affinity(ipt); |
f2a2ce0e HL |
92 | if (retval == -1) { |
93 | ipt->state = TD_EXITED; | |
94 | pthread_mutex_unlock(&ipt->init_lock); | |
95 | return NULL; | |
96 | } | |
97 | ||
98 | ipt->cali_time = calibrate_unit(ipt->data); | |
99 | ||
100 | /* delay to set IDLE class till now for better calibration accuracy */ | |
7e09a9f1 | 101 | #if defined(CONFIG_SCHED_IDLE) |
f2a2ce0e HL |
102 | if ((retval = fio_set_sched_idle())) |
103 | log_err("fio: fio_set_sched_idle failed\n"); | |
104 | #else | |
105 | retval = -1; | |
106 | log_err("fio: fio_set_sched_idle not supported\n"); | |
107 | #endif | |
108 | if (retval == -1) { | |
109 | ipt->state = TD_EXITED; | |
110 | pthread_mutex_unlock(&ipt->init_lock); | |
54ed125b | 111 | goto do_exit; |
f2a2ce0e HL |
112 | } |
113 | ||
114 | ipt->state = TD_INITIALIZED; | |
115 | ||
116 | /* signal the main thread that calibration is done */ | |
117 | pthread_cond_signal(&ipt->cond); | |
118 | pthread_mutex_unlock(&ipt->init_lock); | |
119 | ||
120 | /* wait for other calibration to finish */ | |
121 | pthread_mutex_lock(&ipt->start_lock); | |
122 | ||
123 | /* exit if other threads failed to initialize */ | |
735ed278 JA |
124 | if (ipc.status == IDLE_PROF_STATUS_ABORT) { |
125 | pthread_mutex_unlock(&ipt->start_lock); | |
54ed125b | 126 | goto do_exit; |
735ed278 | 127 | } |
f2a2ce0e HL |
128 | |
129 | /* exit if we are doing calibration only */ | |
735ed278 JA |
130 | if (ipc.status == IDLE_PROF_STATUS_CALI_STOP) { |
131 | pthread_mutex_unlock(&ipt->start_lock); | |
54ed125b | 132 | goto do_exit; |
735ed278 | 133 | } |
f2a2ce0e HL |
134 | |
135 | fio_gettime(&ipt->tps, NULL); | |
136 | ipt->state = TD_RUNNING; | |
137 | ||
138 | j = 0; | |
139 | while (1) { | |
680b5abc JA |
140 | for (k = 0; k < page_size; k++) { |
141 | ipt->data[(k + j) % page_size] = k % 256; | |
f2a2ce0e HL |
142 | if (ipc.status == IDLE_PROF_STATUS_PROF_STOP) { |
143 | fio_gettime(&ipt->tpe, NULL); | |
144 | goto idle_prof_done; | |
145 | } | |
146 | } | |
147 | j++; | |
148 | } | |
149 | ||
150 | idle_prof_done: | |
151 | ||
680b5abc | 152 | ipt->loops = j + (double) k / page_size; |
f2a2ce0e HL |
153 | ipt->state = TD_EXITED; |
154 | pthread_mutex_unlock(&ipt->start_lock); | |
155 | ||
54ed125b JA |
156 | do_exit: |
157 | free_cpu_affinity(ipt); | |
f2a2ce0e HL |
158 | return NULL; |
159 | } | |
160 | ||
161 | /* calculate mean and standard deviation to complete an unit of work */ | |
162 | static void calibration_stats(void) | |
163 | { | |
164 | int i; | |
680b5abc | 165 | double sum = 0.0, var = 0.0; |
f2a2ce0e HL |
166 | struct idle_prof_thread *ipt; |
167 | ||
168 | for (i = 0; i < ipc.nr_cpus; i++) { | |
169 | ipt = &ipc.ipts[i]; | |
170 | sum += ipt->cali_time; | |
171 | } | |
172 | ||
173 | ipc.cali_mean = sum/ipc.nr_cpus; | |
174 | ||
175 | for (i = 0; i < ipc.nr_cpus; i++) { | |
176 | ipt = &ipc.ipts[i]; | |
177 | var += pow(ipt->cali_time-ipc.cali_mean, 2); | |
178 | } | |
179 | ||
180 | ipc.cali_stddev = sqrt(var/(ipc.nr_cpus-1)); | |
181 | } | |
182 | ||
183 | void fio_idle_prof_init(void) | |
184 | { | |
185 | int i, ret; | |
f2a2ce0e | 186 | struct timespec ts; |
680b5abc | 187 | pthread_attr_t tattr; |
f2a2ce0e HL |
188 | struct idle_prof_thread *ipt; |
189 | ||
190 | ipc.nr_cpus = cpus_online(); | |
191 | ipc.status = IDLE_PROF_STATUS_OK; | |
192 | ||
193 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
194 | return; | |
195 | ||
196 | if ((ret = pthread_attr_init(&tattr))) { | |
197 | log_err("fio: pthread_attr_init %s\n", strerror(ret)); | |
198 | return; | |
199 | } | |
200 | if ((ret = pthread_attr_setscope(&tattr, PTHREAD_SCOPE_SYSTEM))) { | |
201 | log_err("fio: pthread_attr_setscope %s\n", strerror(ret)); | |
202 | return; | |
203 | } | |
204 | ||
205 | ipc.ipts = malloc(ipc.nr_cpus * sizeof(struct idle_prof_thread)); | |
206 | if (!ipc.ipts) { | |
207 | log_err("fio: malloc failed\n"); | |
208 | return; | |
209 | } | |
210 | ||
211 | ipc.buf = malloc(ipc.nr_cpus * page_size); | |
212 | if (!ipc.buf) { | |
213 | log_err("fio: malloc failed\n"); | |
214 | free(ipc.ipts); | |
215 | return; | |
216 | } | |
217 | ||
680b5abc JA |
218 | /* |
219 | * profiling aborts on any single thread failure since the | |
f2a2ce0e HL |
220 | * result won't be accurate if any cpu is not used. |
221 | */ | |
222 | for (i = 0; i < ipc.nr_cpus; i++) { | |
223 | ipt = &ipc.ipts[i]; | |
224 | ||
225 | ipt->cpu = i; | |
226 | ipt->state = TD_NOT_CREATED; | |
227 | ipt->data = (unsigned char *)(ipc.buf + page_size * i); | |
228 | ||
229 | if ((ret = pthread_mutex_init(&ipt->init_lock, NULL))) { | |
230 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
231 | log_err("fio: pthread_mutex_init %s\n", strerror(ret)); | |
232 | break; | |
233 | } | |
234 | ||
235 | if ((ret = pthread_mutex_init(&ipt->start_lock, NULL))) { | |
236 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
237 | log_err("fio: pthread_mutex_init %s\n", strerror(ret)); | |
238 | break; | |
239 | } | |
240 | ||
241 | if ((ret = pthread_cond_init(&ipt->cond, NULL))) { | |
242 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
243 | log_err("fio: pthread_cond_init %s\n", strerror(ret)); | |
244 | break; | |
245 | } | |
246 | ||
247 | /* make sure all threads are spawned before they start */ | |
248 | pthread_mutex_lock(&ipt->init_lock); | |
249 | ||
250 | /* make sure all threads finish init before profiling starts */ | |
251 | pthread_mutex_lock(&ipt->start_lock); | |
252 | ||
253 | if ((ret = pthread_create(&ipt->thread, &tattr, idle_prof_thread_fn, ipt))) { | |
254 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
255 | log_err("fio: pthread_create %s\n", strerror(ret)); | |
256 | break; | |
680b5abc | 257 | } else |
f2a2ce0e | 258 | ipt->state = TD_CREATED; |
f2a2ce0e HL |
259 | |
260 | if ((ret = pthread_detach(ipt->thread))) { | |
261 | /* log error and let the thread spin */ | |
5bb39b7c | 262 | log_err("fio: pthread_detach %s\n", strerror(ret)); |
f2a2ce0e HL |
263 | } |
264 | } | |
265 | ||
680b5abc JA |
266 | /* |
267 | * let good threads continue so that they can exit | |
268 | * if errors on other threads occurred previously. | |
f2a2ce0e HL |
269 | */ |
270 | for (i = 0; i < ipc.nr_cpus; i++) { | |
271 | ipt = &ipc.ipts[i]; | |
272 | pthread_mutex_unlock(&ipt->init_lock); | |
273 | } | |
274 | ||
275 | if (ipc.status == IDLE_PROF_STATUS_ABORT) | |
276 | return; | |
277 | ||
278 | /* wait for calibration to finish */ | |
279 | for (i = 0; i < ipc.nr_cpus; i++) { | |
280 | ipt = &ipc.ipts[i]; | |
281 | pthread_mutex_lock(&ipt->init_lock); | |
680b5abc JA |
282 | while ((ipt->state != TD_EXITED) && |
283 | (ipt->state!=TD_INITIALIZED)) { | |
8b6a404c VF |
284 | fio_gettime(&ts, NULL); |
285 | ts.tv_sec += 1; | |
f2a2ce0e HL |
286 | pthread_cond_timedwait(&ipt->cond, &ipt->init_lock, &ts); |
287 | } | |
288 | pthread_mutex_unlock(&ipt->init_lock); | |
289 | ||
680b5abc JA |
290 | /* |
291 | * any thread failed to initialize would abort other threads | |
f2a2ce0e HL |
292 | * later after fio_idle_prof_start. |
293 | */ | |
294 | if (ipt->state == TD_EXITED) | |
295 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
296 | } | |
297 | ||
298 | if (ipc.status != IDLE_PROF_STATUS_ABORT) | |
299 | calibration_stats(); | |
680b5abc | 300 | else |
f2a2ce0e HL |
301 | ipc.cali_mean = ipc.cali_stddev = 0.0; |
302 | ||
303 | if (ipc.opt == IDLE_PROF_OPT_CALI) | |
304 | ipc.status = IDLE_PROF_STATUS_CALI_STOP; | |
305 | } | |
306 | ||
307 | void fio_idle_prof_start(void) | |
308 | { | |
309 | int i; | |
310 | struct idle_prof_thread *ipt; | |
311 | ||
312 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
313 | return; | |
314 | ||
315 | /* unlock regardless abort is set or not */ | |
316 | for (i = 0; i < ipc.nr_cpus; i++) { | |
317 | ipt = &ipc.ipts[i]; | |
318 | pthread_mutex_unlock(&ipt->start_lock); | |
319 | } | |
320 | } | |
321 | ||
322 | void fio_idle_prof_stop(void) | |
323 | { | |
324 | int i; | |
325 | uint64_t runt; | |
f2a2ce0e HL |
326 | struct timespec ts; |
327 | struct idle_prof_thread *ipt; | |
328 | ||
329 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
330 | return; | |
331 | ||
332 | if (ipc.opt == IDLE_PROF_OPT_CALI) | |
333 | return; | |
334 | ||
335 | ipc.status = IDLE_PROF_STATUS_PROF_STOP; | |
336 | ||
337 | /* wait for all threads to exit from profiling */ | |
338 | for (i = 0; i < ipc.nr_cpus; i++) { | |
339 | ipt = &ipc.ipts[i]; | |
340 | pthread_mutex_lock(&ipt->start_lock); | |
680b5abc JA |
341 | while ((ipt->state != TD_EXITED) && |
342 | (ipt->state!=TD_NOT_CREATED)) { | |
8b6a404c VF |
343 | fio_gettime(&ts, NULL); |
344 | ts.tv_sec += 1; | |
f2a2ce0e HL |
345 | /* timed wait in case a signal is not received */ |
346 | pthread_cond_timedwait(&ipt->cond, &ipt->start_lock, &ts); | |
347 | } | |
348 | pthread_mutex_unlock(&ipt->start_lock); | |
349 | ||
350 | /* calculate idleness */ | |
351 | if (ipc.cali_mean != 0.0) { | |
352 | runt = utime_since(&ipt->tps, &ipt->tpe); | |
9da67e75 JA |
353 | if (runt) |
354 | ipt->idleness = ipt->loops * ipc.cali_mean / runt; | |
355 | else | |
356 | ipt->idleness = 0.0; | |
680b5abc | 357 | } else |
f2a2ce0e HL |
358 | ipt->idleness = 0.0; |
359 | } | |
360 | ||
680b5abc JA |
361 | /* |
362 | * memory allocations are freed via explicit fio_idle_prof_cleanup | |
f2a2ce0e HL |
363 | * after profiling stats are collected by apps. |
364 | */ | |
f2a2ce0e HL |
365 | } |
366 | ||
680b5abc JA |
367 | /* |
368 | * return system idle percentage when cpu is -1; | |
f2a2ce0e HL |
369 | * return one cpu idle percentage otherwise. |
370 | */ | |
371 | static double fio_idle_prof_cpu_stat(int cpu) | |
372 | { | |
373 | int i, nr_cpus = ipc.nr_cpus; | |
374 | struct idle_prof_thread *ipt; | |
375 | double p = 0.0; | |
376 | ||
377 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
378 | return 0.0; | |
379 | ||
380 | if ((cpu >= nr_cpus) || (cpu < -1)) { | |
381 | log_err("fio: idle profiling invalid cpu index\n"); | |
382 | return 0.0; | |
383 | } | |
384 | ||
385 | if (cpu == -1) { | |
386 | for (i = 0; i < nr_cpus; i++) { | |
387 | ipt = &ipc.ipts[i]; | |
388 | p += ipt->idleness; | |
389 | } | |
390 | p /= nr_cpus; | |
391 | } else { | |
392 | ipt = &ipc.ipts[cpu]; | |
393 | p = ipt->idleness; | |
394 | } | |
395 | ||
680b5abc | 396 | return p * 100.0; |
f2a2ce0e HL |
397 | } |
398 | ||
10aa136b | 399 | static void fio_idle_prof_cleanup(void) |
f2a2ce0e HL |
400 | { |
401 | if (ipc.ipts) { | |
402 | free(ipc.ipts); | |
403 | ipc.ipts = NULL; | |
404 | } | |
405 | ||
406 | if (ipc.buf) { | |
407 | free(ipc.buf); | |
408 | ipc.buf = NULL; | |
409 | } | |
410 | } | |
411 | ||
412 | int fio_idle_prof_parse_opt(const char *args) | |
413 | { | |
414 | ipc.opt = IDLE_PROF_OPT_NONE; /* default */ | |
415 | ||
416 | if (!args) { | |
417 | log_err("fio: empty idle-prof option string\n"); | |
418 | return -1; | |
419 | } | |
420 | ||
7e09a9f1 | 421 | #if defined(FIO_HAVE_CPU_AFFINITY) && defined(CONFIG_SCHED_IDLE) |
f2a2ce0e HL |
422 | if (strcmp("calibrate", args) == 0) { |
423 | ipc.opt = IDLE_PROF_OPT_CALI; | |
424 | fio_idle_prof_init(); | |
425 | fio_idle_prof_start(); | |
426 | fio_idle_prof_stop(); | |
a666cab8 | 427 | show_idle_prof_stats(FIO_OUTPUT_NORMAL, NULL, NULL); |
f2a2ce0e HL |
428 | return 1; |
429 | } else if (strcmp("system", args) == 0) { | |
430 | ipc.opt = IDLE_PROF_OPT_SYSTEM; | |
431 | return 0; | |
432 | } else if (strcmp("percpu", args) == 0) { | |
433 | ipc.opt = IDLE_PROF_OPT_PERCPU; | |
434 | return 0; | |
435 | } else { | |
4e0a8fa2 | 436 | log_err("fio: incorrect idle-prof option: %s\n", args); |
f2a2ce0e HL |
437 | return -1; |
438 | } | |
439 | #else | |
440 | log_err("fio: idle-prof not supported on this platform\n"); | |
441 | return -1; | |
442 | #endif | |
443 | } | |
444 | ||
a666cab8 JA |
445 | void show_idle_prof_stats(int output, struct json_object *parent, |
446 | struct buf_output *out) | |
f2a2ce0e HL |
447 | { |
448 | int i, nr_cpus = ipc.nr_cpus; | |
449 | struct json_object *tmp; | |
450 | char s[MAX_CPU_STR_LEN]; | |
680b5abc | 451 | |
f2a2ce0e HL |
452 | if (output == FIO_OUTPUT_NORMAL) { |
453 | if (ipc.opt > IDLE_PROF_OPT_CALI) | |
a666cab8 | 454 | log_buf(out, "\nCPU idleness:\n"); |
f2a2ce0e | 455 | else if (ipc.opt == IDLE_PROF_OPT_CALI) |
a666cab8 | 456 | log_buf(out, "CPU idleness:\n"); |
f2a2ce0e HL |
457 | |
458 | if (ipc.opt >= IDLE_PROF_OPT_SYSTEM) | |
a666cab8 | 459 | log_buf(out, " system: %3.2f%%\n", fio_idle_prof_cpu_stat(-1)); |
f2a2ce0e HL |
460 | |
461 | if (ipc.opt == IDLE_PROF_OPT_PERCPU) { | |
a666cab8 | 462 | log_buf(out, " percpu: %3.2f%%", fio_idle_prof_cpu_stat(0)); |
680b5abc | 463 | for (i = 1; i < nr_cpus; i++) |
a666cab8 JA |
464 | log_buf(out, ", %3.2f%%", fio_idle_prof_cpu_stat(i)); |
465 | log_buf(out, "\n"); | |
f2a2ce0e HL |
466 | } |
467 | ||
468 | if (ipc.opt >= IDLE_PROF_OPT_CALI) { | |
a666cab8 JA |
469 | log_buf(out, " unit work: mean=%3.2fus,", ipc.cali_mean); |
470 | log_buf(out, " stddev=%3.2f\n", ipc.cali_stddev); | |
f2a2ce0e HL |
471 | } |
472 | ||
473 | /* dynamic mem allocations can now be freed */ | |
474 | if (ipc.opt != IDLE_PROF_OPT_NONE) | |
475 | fio_idle_prof_cleanup(); | |
476 | ||
477 | return; | |
478 | } | |
680b5abc | 479 | |
236d24df | 480 | if ((ipc.opt != IDLE_PROF_OPT_NONE) && (output & FIO_OUTPUT_JSON)) { |
f2a2ce0e HL |
481 | if (!parent) |
482 | return; | |
483 | ||
484 | tmp = json_create_object(); | |
485 | if (!tmp) | |
486 | return; | |
487 | ||
488 | json_object_add_value_object(parent, "cpu_idleness", tmp); | |
489 | json_object_add_value_float(tmp, "system", fio_idle_prof_cpu_stat(-1)); | |
490 | ||
491 | if (ipc.opt == IDLE_PROF_OPT_PERCPU) { | |
680b5abc | 492 | for (i = 0; i < nr_cpus; i++) { |
f2a2ce0e HL |
493 | snprintf(s, MAX_CPU_STR_LEN, "cpu-%d", i); |
494 | json_object_add_value_float(tmp, s, fio_idle_prof_cpu_stat(i)); | |
495 | } | |
496 | } | |
497 | ||
498 | json_object_add_value_float(tmp, "unit_mean", ipc.cali_mean); | |
499 | json_object_add_value_float(tmp, "unit_stddev", ipc.cali_stddev); | |
500 | ||
501 | fio_idle_prof_cleanup(); | |
f2a2ce0e HL |
502 | } |
503 | } |