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; | |
14 | struct timeval tps; | |
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 | ||
59358c8e JA |
46 | static int set_cpu_affinity(struct idle_prof_thread *ipt) |
47 | { | |
48 | #if defined(FIO_HAVE_CPU_AFFINITY) | |
49 | os_cpu_mask_t cpu_mask; | |
50 | ||
51 | memset(&cpu_mask, 0, sizeof(cpu_mask)); | |
52 | fio_cpu_set(&cpu_mask, ipt->cpu); | |
53 | ||
54 | if (fio_setaffinity(gettid(), cpu_mask)) { | |
55 | log_err("fio: fio_setaffinity failed\n"); | |
56 | return -1; | |
57 | } | |
58 | ||
59 | return 0; | |
60 | #else | |
61 | log_err("fio: fio_setaffinity not supported\n"); | |
62 | return -1; | |
63 | #endif | |
64 | } | |
65 | ||
f2a2ce0e HL |
66 | static void *idle_prof_thread_fn(void *data) |
67 | { | |
68 | int retval; | |
69 | unsigned long j, k; | |
70 | struct idle_prof_thread *ipt = data; | |
71 | ||
72 | /* wait for all threads are spawned */ | |
73 | pthread_mutex_lock(&ipt->init_lock); | |
74 | ||
75 | /* exit if any other thread failed to start */ | |
76 | if (ipc.status == IDLE_PROF_STATUS_ABORT) | |
77 | return NULL; | |
78 | ||
59358c8e | 79 | retval = set_cpu_affinity(ipt); |
f2a2ce0e HL |
80 | if (retval == -1) { |
81 | ipt->state = TD_EXITED; | |
82 | pthread_mutex_unlock(&ipt->init_lock); | |
83 | return NULL; | |
84 | } | |
85 | ||
86 | ipt->cali_time = calibrate_unit(ipt->data); | |
87 | ||
88 | /* delay to set IDLE class till now for better calibration accuracy */ | |
7e09a9f1 | 89 | #if defined(CONFIG_SCHED_IDLE) |
f2a2ce0e HL |
90 | if ((retval = fio_set_sched_idle())) |
91 | log_err("fio: fio_set_sched_idle failed\n"); | |
92 | #else | |
93 | retval = -1; | |
94 | log_err("fio: fio_set_sched_idle not supported\n"); | |
95 | #endif | |
96 | if (retval == -1) { | |
97 | ipt->state = TD_EXITED; | |
98 | pthread_mutex_unlock(&ipt->init_lock); | |
99 | return NULL; | |
100 | } | |
101 | ||
102 | ipt->state = TD_INITIALIZED; | |
103 | ||
104 | /* signal the main thread that calibration is done */ | |
105 | pthread_cond_signal(&ipt->cond); | |
106 | pthread_mutex_unlock(&ipt->init_lock); | |
107 | ||
108 | /* wait for other calibration to finish */ | |
109 | pthread_mutex_lock(&ipt->start_lock); | |
110 | ||
111 | /* exit if other threads failed to initialize */ | |
735ed278 JA |
112 | if (ipc.status == IDLE_PROF_STATUS_ABORT) { |
113 | pthread_mutex_unlock(&ipt->start_lock); | |
f2a2ce0e | 114 | return NULL; |
735ed278 | 115 | } |
f2a2ce0e HL |
116 | |
117 | /* exit if we are doing calibration only */ | |
735ed278 JA |
118 | if (ipc.status == IDLE_PROF_STATUS_CALI_STOP) { |
119 | pthread_mutex_unlock(&ipt->start_lock); | |
f2a2ce0e | 120 | return NULL; |
735ed278 | 121 | } |
f2a2ce0e HL |
122 | |
123 | fio_gettime(&ipt->tps, NULL); | |
124 | ipt->state = TD_RUNNING; | |
125 | ||
126 | j = 0; | |
127 | while (1) { | |
680b5abc JA |
128 | for (k = 0; k < page_size; k++) { |
129 | ipt->data[(k + j) % page_size] = k % 256; | |
f2a2ce0e HL |
130 | if (ipc.status == IDLE_PROF_STATUS_PROF_STOP) { |
131 | fio_gettime(&ipt->tpe, NULL); | |
132 | goto idle_prof_done; | |
133 | } | |
134 | } | |
135 | j++; | |
136 | } | |
137 | ||
138 | idle_prof_done: | |
139 | ||
680b5abc | 140 | ipt->loops = j + (double) k / page_size; |
f2a2ce0e HL |
141 | ipt->state = TD_EXITED; |
142 | pthread_mutex_unlock(&ipt->start_lock); | |
143 | ||
144 | return NULL; | |
145 | } | |
146 | ||
147 | /* calculate mean and standard deviation to complete an unit of work */ | |
148 | static void calibration_stats(void) | |
149 | { | |
150 | int i; | |
680b5abc | 151 | double sum = 0.0, var = 0.0; |
f2a2ce0e HL |
152 | struct idle_prof_thread *ipt; |
153 | ||
154 | for (i = 0; i < ipc.nr_cpus; i++) { | |
155 | ipt = &ipc.ipts[i]; | |
156 | sum += ipt->cali_time; | |
157 | } | |
158 | ||
159 | ipc.cali_mean = sum/ipc.nr_cpus; | |
160 | ||
161 | for (i = 0; i < ipc.nr_cpus; i++) { | |
162 | ipt = &ipc.ipts[i]; | |
163 | var += pow(ipt->cali_time-ipc.cali_mean, 2); | |
164 | } | |
165 | ||
166 | ipc.cali_stddev = sqrt(var/(ipc.nr_cpus-1)); | |
167 | } | |
168 | ||
169 | void fio_idle_prof_init(void) | |
170 | { | |
171 | int i, ret; | |
172 | struct timeval tp; | |
173 | struct timespec ts; | |
680b5abc | 174 | pthread_attr_t tattr; |
f2a2ce0e HL |
175 | struct idle_prof_thread *ipt; |
176 | ||
177 | ipc.nr_cpus = cpus_online(); | |
178 | ipc.status = IDLE_PROF_STATUS_OK; | |
179 | ||
180 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
181 | return; | |
182 | ||
183 | if ((ret = pthread_attr_init(&tattr))) { | |
184 | log_err("fio: pthread_attr_init %s\n", strerror(ret)); | |
185 | return; | |
186 | } | |
187 | if ((ret = pthread_attr_setscope(&tattr, PTHREAD_SCOPE_SYSTEM))) { | |
188 | log_err("fio: pthread_attr_setscope %s\n", strerror(ret)); | |
189 | return; | |
190 | } | |
191 | ||
192 | ipc.ipts = malloc(ipc.nr_cpus * sizeof(struct idle_prof_thread)); | |
193 | if (!ipc.ipts) { | |
194 | log_err("fio: malloc failed\n"); | |
195 | return; | |
196 | } | |
197 | ||
198 | ipc.buf = malloc(ipc.nr_cpus * page_size); | |
199 | if (!ipc.buf) { | |
200 | log_err("fio: malloc failed\n"); | |
201 | free(ipc.ipts); | |
202 | return; | |
203 | } | |
204 | ||
680b5abc JA |
205 | /* |
206 | * profiling aborts on any single thread failure since the | |
f2a2ce0e HL |
207 | * result won't be accurate if any cpu is not used. |
208 | */ | |
209 | for (i = 0; i < ipc.nr_cpus; i++) { | |
210 | ipt = &ipc.ipts[i]; | |
211 | ||
212 | ipt->cpu = i; | |
213 | ipt->state = TD_NOT_CREATED; | |
214 | ipt->data = (unsigned char *)(ipc.buf + page_size * i); | |
215 | ||
216 | if ((ret = pthread_mutex_init(&ipt->init_lock, NULL))) { | |
217 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
218 | log_err("fio: pthread_mutex_init %s\n", strerror(ret)); | |
219 | break; | |
220 | } | |
221 | ||
222 | if ((ret = pthread_mutex_init(&ipt->start_lock, NULL))) { | |
223 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
224 | log_err("fio: pthread_mutex_init %s\n", strerror(ret)); | |
225 | break; | |
226 | } | |
227 | ||
228 | if ((ret = pthread_cond_init(&ipt->cond, NULL))) { | |
229 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
230 | log_err("fio: pthread_cond_init %s\n", strerror(ret)); | |
231 | break; | |
232 | } | |
233 | ||
234 | /* make sure all threads are spawned before they start */ | |
235 | pthread_mutex_lock(&ipt->init_lock); | |
236 | ||
237 | /* make sure all threads finish init before profiling starts */ | |
238 | pthread_mutex_lock(&ipt->start_lock); | |
239 | ||
240 | if ((ret = pthread_create(&ipt->thread, &tattr, idle_prof_thread_fn, ipt))) { | |
241 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
242 | log_err("fio: pthread_create %s\n", strerror(ret)); | |
243 | break; | |
680b5abc | 244 | } else |
f2a2ce0e | 245 | ipt->state = TD_CREATED; |
f2a2ce0e HL |
246 | |
247 | if ((ret = pthread_detach(ipt->thread))) { | |
248 | /* log error and let the thread spin */ | |
249 | log_err("fio: pthread_detatch %s\n", strerror(ret)); | |
250 | } | |
251 | } | |
252 | ||
680b5abc JA |
253 | /* |
254 | * let good threads continue so that they can exit | |
255 | * if errors on other threads occurred previously. | |
f2a2ce0e HL |
256 | */ |
257 | for (i = 0; i < ipc.nr_cpus; i++) { | |
258 | ipt = &ipc.ipts[i]; | |
259 | pthread_mutex_unlock(&ipt->init_lock); | |
260 | } | |
261 | ||
262 | if (ipc.status == IDLE_PROF_STATUS_ABORT) | |
263 | return; | |
264 | ||
265 | /* wait for calibration to finish */ | |
266 | for (i = 0; i < ipc.nr_cpus; i++) { | |
267 | ipt = &ipc.ipts[i]; | |
268 | pthread_mutex_lock(&ipt->init_lock); | |
680b5abc JA |
269 | while ((ipt->state != TD_EXITED) && |
270 | (ipt->state!=TD_INITIALIZED)) { | |
f2a2ce0e HL |
271 | fio_gettime(&tp, NULL); |
272 | ts.tv_sec = tp.tv_sec + 1; | |
273 | ts.tv_nsec = tp.tv_usec * 1000; | |
274 | pthread_cond_timedwait(&ipt->cond, &ipt->init_lock, &ts); | |
275 | } | |
276 | pthread_mutex_unlock(&ipt->init_lock); | |
277 | ||
680b5abc JA |
278 | /* |
279 | * any thread failed to initialize would abort other threads | |
f2a2ce0e HL |
280 | * later after fio_idle_prof_start. |
281 | */ | |
282 | if (ipt->state == TD_EXITED) | |
283 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
284 | } | |
285 | ||
286 | if (ipc.status != IDLE_PROF_STATUS_ABORT) | |
287 | calibration_stats(); | |
680b5abc | 288 | else |
f2a2ce0e HL |
289 | ipc.cali_mean = ipc.cali_stddev = 0.0; |
290 | ||
291 | if (ipc.opt == IDLE_PROF_OPT_CALI) | |
292 | ipc.status = IDLE_PROF_STATUS_CALI_STOP; | |
293 | } | |
294 | ||
295 | void fio_idle_prof_start(void) | |
296 | { | |
297 | int i; | |
298 | struct idle_prof_thread *ipt; | |
299 | ||
300 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
301 | return; | |
302 | ||
303 | /* unlock regardless abort is set or not */ | |
304 | for (i = 0; i < ipc.nr_cpus; i++) { | |
305 | ipt = &ipc.ipts[i]; | |
306 | pthread_mutex_unlock(&ipt->start_lock); | |
307 | } | |
308 | } | |
309 | ||
310 | void fio_idle_prof_stop(void) | |
311 | { | |
312 | int i; | |
313 | uint64_t runt; | |
314 | struct timeval tp; | |
315 | struct timespec ts; | |
316 | struct idle_prof_thread *ipt; | |
317 | ||
318 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
319 | return; | |
320 | ||
321 | if (ipc.opt == IDLE_PROF_OPT_CALI) | |
322 | return; | |
323 | ||
324 | ipc.status = IDLE_PROF_STATUS_PROF_STOP; | |
325 | ||
326 | /* wait for all threads to exit from profiling */ | |
327 | for (i = 0; i < ipc.nr_cpus; i++) { | |
328 | ipt = &ipc.ipts[i]; | |
329 | pthread_mutex_lock(&ipt->start_lock); | |
680b5abc JA |
330 | while ((ipt->state != TD_EXITED) && |
331 | (ipt->state!=TD_NOT_CREATED)) { | |
f2a2ce0e HL |
332 | fio_gettime(&tp, NULL); |
333 | ts.tv_sec = tp.tv_sec + 1; | |
334 | ts.tv_nsec = tp.tv_usec * 1000; | |
335 | /* timed wait in case a signal is not received */ | |
336 | pthread_cond_timedwait(&ipt->cond, &ipt->start_lock, &ts); | |
337 | } | |
338 | pthread_mutex_unlock(&ipt->start_lock); | |
339 | ||
340 | /* calculate idleness */ | |
341 | if (ipc.cali_mean != 0.0) { | |
342 | runt = utime_since(&ipt->tps, &ipt->tpe); | |
9da67e75 JA |
343 | if (runt) |
344 | ipt->idleness = ipt->loops * ipc.cali_mean / runt; | |
345 | else | |
346 | ipt->idleness = 0.0; | |
680b5abc | 347 | } else |
f2a2ce0e HL |
348 | ipt->idleness = 0.0; |
349 | } | |
350 | ||
680b5abc JA |
351 | /* |
352 | * memory allocations are freed via explicit fio_idle_prof_cleanup | |
f2a2ce0e HL |
353 | * after profiling stats are collected by apps. |
354 | */ | |
f2a2ce0e HL |
355 | } |
356 | ||
680b5abc JA |
357 | /* |
358 | * return system idle percentage when cpu is -1; | |
f2a2ce0e HL |
359 | * return one cpu idle percentage otherwise. |
360 | */ | |
361 | static double fio_idle_prof_cpu_stat(int cpu) | |
362 | { | |
363 | int i, nr_cpus = ipc.nr_cpus; | |
364 | struct idle_prof_thread *ipt; | |
365 | double p = 0.0; | |
366 | ||
367 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
368 | return 0.0; | |
369 | ||
370 | if ((cpu >= nr_cpus) || (cpu < -1)) { | |
371 | log_err("fio: idle profiling invalid cpu index\n"); | |
372 | return 0.0; | |
373 | } | |
374 | ||
375 | if (cpu == -1) { | |
376 | for (i = 0; i < nr_cpus; i++) { | |
377 | ipt = &ipc.ipts[i]; | |
378 | p += ipt->idleness; | |
379 | } | |
380 | p /= nr_cpus; | |
381 | } else { | |
382 | ipt = &ipc.ipts[cpu]; | |
383 | p = ipt->idleness; | |
384 | } | |
385 | ||
680b5abc | 386 | return p * 100.0; |
f2a2ce0e HL |
387 | } |
388 | ||
10aa136b | 389 | static void fio_idle_prof_cleanup(void) |
f2a2ce0e HL |
390 | { |
391 | if (ipc.ipts) { | |
392 | free(ipc.ipts); | |
393 | ipc.ipts = NULL; | |
394 | } | |
395 | ||
396 | if (ipc.buf) { | |
397 | free(ipc.buf); | |
398 | ipc.buf = NULL; | |
399 | } | |
400 | } | |
401 | ||
402 | int fio_idle_prof_parse_opt(const char *args) | |
403 | { | |
404 | ipc.opt = IDLE_PROF_OPT_NONE; /* default */ | |
405 | ||
406 | if (!args) { | |
407 | log_err("fio: empty idle-prof option string\n"); | |
408 | return -1; | |
409 | } | |
410 | ||
7e09a9f1 | 411 | #if defined(FIO_HAVE_CPU_AFFINITY) && defined(CONFIG_SCHED_IDLE) |
f2a2ce0e HL |
412 | if (strcmp("calibrate", args) == 0) { |
413 | ipc.opt = IDLE_PROF_OPT_CALI; | |
414 | fio_idle_prof_init(); | |
415 | fio_idle_prof_start(); | |
416 | fio_idle_prof_stop(); | |
417 | show_idle_prof_stats(FIO_OUTPUT_NORMAL, NULL); | |
418 | return 1; | |
419 | } else if (strcmp("system", args) == 0) { | |
420 | ipc.opt = IDLE_PROF_OPT_SYSTEM; | |
421 | return 0; | |
422 | } else if (strcmp("percpu", args) == 0) { | |
423 | ipc.opt = IDLE_PROF_OPT_PERCPU; | |
424 | return 0; | |
425 | } else { | |
4e0a8fa2 | 426 | log_err("fio: incorrect idle-prof option: %s\n", args); |
f2a2ce0e HL |
427 | return -1; |
428 | } | |
429 | #else | |
430 | log_err("fio: idle-prof not supported on this platform\n"); | |
431 | return -1; | |
432 | #endif | |
433 | } | |
434 | ||
435 | void show_idle_prof_stats(int output, struct json_object *parent) | |
436 | { | |
437 | int i, nr_cpus = ipc.nr_cpus; | |
438 | struct json_object *tmp; | |
439 | char s[MAX_CPU_STR_LEN]; | |
680b5abc | 440 | |
f2a2ce0e HL |
441 | if (output == FIO_OUTPUT_NORMAL) { |
442 | if (ipc.opt > IDLE_PROF_OPT_CALI) | |
443 | log_info("\nCPU idleness:\n"); | |
444 | else if (ipc.opt == IDLE_PROF_OPT_CALI) | |
445 | log_info("CPU idleness:\n"); | |
446 | ||
447 | if (ipc.opt >= IDLE_PROF_OPT_SYSTEM) | |
448 | log_info(" system: %3.2f%%\n", fio_idle_prof_cpu_stat(-1)); | |
449 | ||
450 | if (ipc.opt == IDLE_PROF_OPT_PERCPU) { | |
451 | log_info(" percpu: %3.2f%%", fio_idle_prof_cpu_stat(0)); | |
680b5abc | 452 | for (i = 1; i < nr_cpus; i++) |
f2a2ce0e | 453 | log_info(", %3.2f%%", fio_idle_prof_cpu_stat(i)); |
f2a2ce0e HL |
454 | log_info("\n"); |
455 | } | |
456 | ||
457 | if (ipc.opt >= IDLE_PROF_OPT_CALI) { | |
458 | log_info(" unit work: mean=%3.2fus,", ipc.cali_mean); | |
459 | log_info(" stddev=%3.2f\n", ipc.cali_stddev); | |
460 | } | |
461 | ||
462 | /* dynamic mem allocations can now be freed */ | |
463 | if (ipc.opt != IDLE_PROF_OPT_NONE) | |
464 | fio_idle_prof_cleanup(); | |
465 | ||
466 | return; | |
467 | } | |
680b5abc | 468 | |
f2a2ce0e HL |
469 | if ((ipc.opt != IDLE_PROF_OPT_NONE) && (output == FIO_OUTPUT_JSON)) { |
470 | if (!parent) | |
471 | return; | |
472 | ||
473 | tmp = json_create_object(); | |
474 | if (!tmp) | |
475 | return; | |
476 | ||
477 | json_object_add_value_object(parent, "cpu_idleness", tmp); | |
478 | json_object_add_value_float(tmp, "system", fio_idle_prof_cpu_stat(-1)); | |
479 | ||
480 | if (ipc.opt == IDLE_PROF_OPT_PERCPU) { | |
680b5abc | 481 | for (i = 0; i < nr_cpus; i++) { |
f2a2ce0e HL |
482 | snprintf(s, MAX_CPU_STR_LEN, "cpu-%d", i); |
483 | json_object_add_value_float(tmp, s, fio_idle_prof_cpu_stat(i)); | |
484 | } | |
485 | } | |
486 | ||
487 | json_object_add_value_float(tmp, "unit_mean", ipc.cali_mean); | |
488 | json_object_add_value_float(tmp, "unit_stddev", ipc.cali_stddev); | |
489 | ||
490 | fio_idle_prof_cleanup(); | |
f2a2ce0e HL |
491 | } |
492 | } |