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 */ | |
d5b351d4 JA |
76 | if (ipc.status == IDLE_PROF_STATUS_ABORT) { |
77 | pthread_mutex_unlock(&ipt->init_lock); | |
f2a2ce0e | 78 | return NULL; |
d5b351d4 | 79 | } |
f2a2ce0e | 80 | |
59358c8e | 81 | retval = set_cpu_affinity(ipt); |
f2a2ce0e HL |
82 | if (retval == -1) { |
83 | ipt->state = TD_EXITED; | |
84 | pthread_mutex_unlock(&ipt->init_lock); | |
85 | return NULL; | |
86 | } | |
87 | ||
88 | ipt->cali_time = calibrate_unit(ipt->data); | |
89 | ||
90 | /* delay to set IDLE class till now for better calibration accuracy */ | |
7e09a9f1 | 91 | #if defined(CONFIG_SCHED_IDLE) |
f2a2ce0e HL |
92 | if ((retval = fio_set_sched_idle())) |
93 | log_err("fio: fio_set_sched_idle failed\n"); | |
94 | #else | |
95 | retval = -1; | |
96 | log_err("fio: fio_set_sched_idle not supported\n"); | |
97 | #endif | |
98 | if (retval == -1) { | |
99 | ipt->state = TD_EXITED; | |
100 | pthread_mutex_unlock(&ipt->init_lock); | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | ipt->state = TD_INITIALIZED; | |
105 | ||
106 | /* signal the main thread that calibration is done */ | |
107 | pthread_cond_signal(&ipt->cond); | |
108 | pthread_mutex_unlock(&ipt->init_lock); | |
109 | ||
110 | /* wait for other calibration to finish */ | |
111 | pthread_mutex_lock(&ipt->start_lock); | |
112 | ||
113 | /* exit if other threads failed to initialize */ | |
735ed278 JA |
114 | if (ipc.status == IDLE_PROF_STATUS_ABORT) { |
115 | pthread_mutex_unlock(&ipt->start_lock); | |
f2a2ce0e | 116 | return NULL; |
735ed278 | 117 | } |
f2a2ce0e HL |
118 | |
119 | /* exit if we are doing calibration only */ | |
735ed278 JA |
120 | if (ipc.status == IDLE_PROF_STATUS_CALI_STOP) { |
121 | pthread_mutex_unlock(&ipt->start_lock); | |
f2a2ce0e | 122 | return NULL; |
735ed278 | 123 | } |
f2a2ce0e HL |
124 | |
125 | fio_gettime(&ipt->tps, NULL); | |
126 | ipt->state = TD_RUNNING; | |
127 | ||
128 | j = 0; | |
129 | while (1) { | |
680b5abc JA |
130 | for (k = 0; k < page_size; k++) { |
131 | ipt->data[(k + j) % page_size] = k % 256; | |
f2a2ce0e HL |
132 | if (ipc.status == IDLE_PROF_STATUS_PROF_STOP) { |
133 | fio_gettime(&ipt->tpe, NULL); | |
134 | goto idle_prof_done; | |
135 | } | |
136 | } | |
137 | j++; | |
138 | } | |
139 | ||
140 | idle_prof_done: | |
141 | ||
680b5abc | 142 | ipt->loops = j + (double) k / page_size; |
f2a2ce0e HL |
143 | ipt->state = TD_EXITED; |
144 | pthread_mutex_unlock(&ipt->start_lock); | |
145 | ||
146 | return NULL; | |
147 | } | |
148 | ||
149 | /* calculate mean and standard deviation to complete an unit of work */ | |
150 | static void calibration_stats(void) | |
151 | { | |
152 | int i; | |
680b5abc | 153 | double sum = 0.0, var = 0.0; |
f2a2ce0e HL |
154 | struct idle_prof_thread *ipt; |
155 | ||
156 | for (i = 0; i < ipc.nr_cpus; i++) { | |
157 | ipt = &ipc.ipts[i]; | |
158 | sum += ipt->cali_time; | |
159 | } | |
160 | ||
161 | ipc.cali_mean = sum/ipc.nr_cpus; | |
162 | ||
163 | for (i = 0; i < ipc.nr_cpus; i++) { | |
164 | ipt = &ipc.ipts[i]; | |
165 | var += pow(ipt->cali_time-ipc.cali_mean, 2); | |
166 | } | |
167 | ||
168 | ipc.cali_stddev = sqrt(var/(ipc.nr_cpus-1)); | |
169 | } | |
170 | ||
171 | void fio_idle_prof_init(void) | |
172 | { | |
173 | int i, ret; | |
174 | struct timeval tp; | |
175 | struct timespec ts; | |
680b5abc | 176 | pthread_attr_t tattr; |
f2a2ce0e HL |
177 | struct idle_prof_thread *ipt; |
178 | ||
179 | ipc.nr_cpus = cpus_online(); | |
180 | ipc.status = IDLE_PROF_STATUS_OK; | |
181 | ||
182 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
183 | return; | |
184 | ||
185 | if ((ret = pthread_attr_init(&tattr))) { | |
186 | log_err("fio: pthread_attr_init %s\n", strerror(ret)); | |
187 | return; | |
188 | } | |
189 | if ((ret = pthread_attr_setscope(&tattr, PTHREAD_SCOPE_SYSTEM))) { | |
190 | log_err("fio: pthread_attr_setscope %s\n", strerror(ret)); | |
191 | return; | |
192 | } | |
193 | ||
194 | ipc.ipts = malloc(ipc.nr_cpus * sizeof(struct idle_prof_thread)); | |
195 | if (!ipc.ipts) { | |
196 | log_err("fio: malloc failed\n"); | |
197 | return; | |
198 | } | |
199 | ||
200 | ipc.buf = malloc(ipc.nr_cpus * page_size); | |
201 | if (!ipc.buf) { | |
202 | log_err("fio: malloc failed\n"); | |
203 | free(ipc.ipts); | |
204 | return; | |
205 | } | |
206 | ||
680b5abc JA |
207 | /* |
208 | * profiling aborts on any single thread failure since the | |
f2a2ce0e HL |
209 | * result won't be accurate if any cpu is not used. |
210 | */ | |
211 | for (i = 0; i < ipc.nr_cpus; i++) { | |
212 | ipt = &ipc.ipts[i]; | |
213 | ||
214 | ipt->cpu = i; | |
215 | ipt->state = TD_NOT_CREATED; | |
216 | ipt->data = (unsigned char *)(ipc.buf + page_size * i); | |
217 | ||
218 | if ((ret = pthread_mutex_init(&ipt->init_lock, NULL))) { | |
219 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
220 | log_err("fio: pthread_mutex_init %s\n", strerror(ret)); | |
221 | break; | |
222 | } | |
223 | ||
224 | if ((ret = pthread_mutex_init(&ipt->start_lock, NULL))) { | |
225 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
226 | log_err("fio: pthread_mutex_init %s\n", strerror(ret)); | |
227 | break; | |
228 | } | |
229 | ||
230 | if ((ret = pthread_cond_init(&ipt->cond, NULL))) { | |
231 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
232 | log_err("fio: pthread_cond_init %s\n", strerror(ret)); | |
233 | break; | |
234 | } | |
235 | ||
236 | /* make sure all threads are spawned before they start */ | |
237 | pthread_mutex_lock(&ipt->init_lock); | |
238 | ||
239 | /* make sure all threads finish init before profiling starts */ | |
240 | pthread_mutex_lock(&ipt->start_lock); | |
241 | ||
242 | if ((ret = pthread_create(&ipt->thread, &tattr, idle_prof_thread_fn, ipt))) { | |
243 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
244 | log_err("fio: pthread_create %s\n", strerror(ret)); | |
245 | break; | |
680b5abc | 246 | } else |
f2a2ce0e | 247 | ipt->state = TD_CREATED; |
f2a2ce0e HL |
248 | |
249 | if ((ret = pthread_detach(ipt->thread))) { | |
250 | /* log error and let the thread spin */ | |
251 | log_err("fio: pthread_detatch %s\n", strerror(ret)); | |
252 | } | |
253 | } | |
254 | ||
680b5abc JA |
255 | /* |
256 | * let good threads continue so that they can exit | |
257 | * if errors on other threads occurred previously. | |
f2a2ce0e HL |
258 | */ |
259 | for (i = 0; i < ipc.nr_cpus; i++) { | |
260 | ipt = &ipc.ipts[i]; | |
261 | pthread_mutex_unlock(&ipt->init_lock); | |
262 | } | |
263 | ||
264 | if (ipc.status == IDLE_PROF_STATUS_ABORT) | |
265 | return; | |
266 | ||
267 | /* wait for calibration to finish */ | |
268 | for (i = 0; i < ipc.nr_cpus; i++) { | |
269 | ipt = &ipc.ipts[i]; | |
270 | pthread_mutex_lock(&ipt->init_lock); | |
680b5abc JA |
271 | while ((ipt->state != TD_EXITED) && |
272 | (ipt->state!=TD_INITIALIZED)) { | |
f2a2ce0e HL |
273 | fio_gettime(&tp, NULL); |
274 | ts.tv_sec = tp.tv_sec + 1; | |
275 | ts.tv_nsec = tp.tv_usec * 1000; | |
276 | pthread_cond_timedwait(&ipt->cond, &ipt->init_lock, &ts); | |
277 | } | |
278 | pthread_mutex_unlock(&ipt->init_lock); | |
279 | ||
680b5abc JA |
280 | /* |
281 | * any thread failed to initialize would abort other threads | |
f2a2ce0e HL |
282 | * later after fio_idle_prof_start. |
283 | */ | |
284 | if (ipt->state == TD_EXITED) | |
285 | ipc.status = IDLE_PROF_STATUS_ABORT; | |
286 | } | |
287 | ||
288 | if (ipc.status != IDLE_PROF_STATUS_ABORT) | |
289 | calibration_stats(); | |
680b5abc | 290 | else |
f2a2ce0e HL |
291 | ipc.cali_mean = ipc.cali_stddev = 0.0; |
292 | ||
293 | if (ipc.opt == IDLE_PROF_OPT_CALI) | |
294 | ipc.status = IDLE_PROF_STATUS_CALI_STOP; | |
295 | } | |
296 | ||
297 | void fio_idle_prof_start(void) | |
298 | { | |
299 | int i; | |
300 | struct idle_prof_thread *ipt; | |
301 | ||
302 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
303 | return; | |
304 | ||
305 | /* unlock regardless abort is set or not */ | |
306 | for (i = 0; i < ipc.nr_cpus; i++) { | |
307 | ipt = &ipc.ipts[i]; | |
308 | pthread_mutex_unlock(&ipt->start_lock); | |
309 | } | |
310 | } | |
311 | ||
312 | void fio_idle_prof_stop(void) | |
313 | { | |
314 | int i; | |
315 | uint64_t runt; | |
316 | struct timeval tp; | |
317 | struct timespec ts; | |
318 | struct idle_prof_thread *ipt; | |
319 | ||
320 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
321 | return; | |
322 | ||
323 | if (ipc.opt == IDLE_PROF_OPT_CALI) | |
324 | return; | |
325 | ||
326 | ipc.status = IDLE_PROF_STATUS_PROF_STOP; | |
327 | ||
328 | /* wait for all threads to exit from profiling */ | |
329 | for (i = 0; i < ipc.nr_cpus; i++) { | |
330 | ipt = &ipc.ipts[i]; | |
331 | pthread_mutex_lock(&ipt->start_lock); | |
680b5abc JA |
332 | while ((ipt->state != TD_EXITED) && |
333 | (ipt->state!=TD_NOT_CREATED)) { | |
f2a2ce0e HL |
334 | fio_gettime(&tp, NULL); |
335 | ts.tv_sec = tp.tv_sec + 1; | |
336 | ts.tv_nsec = tp.tv_usec * 1000; | |
337 | /* timed wait in case a signal is not received */ | |
338 | pthread_cond_timedwait(&ipt->cond, &ipt->start_lock, &ts); | |
339 | } | |
340 | pthread_mutex_unlock(&ipt->start_lock); | |
341 | ||
342 | /* calculate idleness */ | |
343 | if (ipc.cali_mean != 0.0) { | |
344 | runt = utime_since(&ipt->tps, &ipt->tpe); | |
9da67e75 JA |
345 | if (runt) |
346 | ipt->idleness = ipt->loops * ipc.cali_mean / runt; | |
347 | else | |
348 | ipt->idleness = 0.0; | |
680b5abc | 349 | } else |
f2a2ce0e HL |
350 | ipt->idleness = 0.0; |
351 | } | |
352 | ||
680b5abc JA |
353 | /* |
354 | * memory allocations are freed via explicit fio_idle_prof_cleanup | |
f2a2ce0e HL |
355 | * after profiling stats are collected by apps. |
356 | */ | |
f2a2ce0e HL |
357 | } |
358 | ||
680b5abc JA |
359 | /* |
360 | * return system idle percentage when cpu is -1; | |
f2a2ce0e HL |
361 | * return one cpu idle percentage otherwise. |
362 | */ | |
363 | static double fio_idle_prof_cpu_stat(int cpu) | |
364 | { | |
365 | int i, nr_cpus = ipc.nr_cpus; | |
366 | struct idle_prof_thread *ipt; | |
367 | double p = 0.0; | |
368 | ||
369 | if (ipc.opt == IDLE_PROF_OPT_NONE) | |
370 | return 0.0; | |
371 | ||
372 | if ((cpu >= nr_cpus) || (cpu < -1)) { | |
373 | log_err("fio: idle profiling invalid cpu index\n"); | |
374 | return 0.0; | |
375 | } | |
376 | ||
377 | if (cpu == -1) { | |
378 | for (i = 0; i < nr_cpus; i++) { | |
379 | ipt = &ipc.ipts[i]; | |
380 | p += ipt->idleness; | |
381 | } | |
382 | p /= nr_cpus; | |
383 | } else { | |
384 | ipt = &ipc.ipts[cpu]; | |
385 | p = ipt->idleness; | |
386 | } | |
387 | ||
680b5abc | 388 | return p * 100.0; |
f2a2ce0e HL |
389 | } |
390 | ||
10aa136b | 391 | static void fio_idle_prof_cleanup(void) |
f2a2ce0e HL |
392 | { |
393 | if (ipc.ipts) { | |
394 | free(ipc.ipts); | |
395 | ipc.ipts = NULL; | |
396 | } | |
397 | ||
398 | if (ipc.buf) { | |
399 | free(ipc.buf); | |
400 | ipc.buf = NULL; | |
401 | } | |
402 | } | |
403 | ||
404 | int fio_idle_prof_parse_opt(const char *args) | |
405 | { | |
406 | ipc.opt = IDLE_PROF_OPT_NONE; /* default */ | |
407 | ||
408 | if (!args) { | |
409 | log_err("fio: empty idle-prof option string\n"); | |
410 | return -1; | |
411 | } | |
412 | ||
7e09a9f1 | 413 | #if defined(FIO_HAVE_CPU_AFFINITY) && defined(CONFIG_SCHED_IDLE) |
f2a2ce0e HL |
414 | if (strcmp("calibrate", args) == 0) { |
415 | ipc.opt = IDLE_PROF_OPT_CALI; | |
416 | fio_idle_prof_init(); | |
417 | fio_idle_prof_start(); | |
418 | fio_idle_prof_stop(); | |
419 | show_idle_prof_stats(FIO_OUTPUT_NORMAL, NULL); | |
420 | return 1; | |
421 | } else if (strcmp("system", args) == 0) { | |
422 | ipc.opt = IDLE_PROF_OPT_SYSTEM; | |
423 | return 0; | |
424 | } else if (strcmp("percpu", args) == 0) { | |
425 | ipc.opt = IDLE_PROF_OPT_PERCPU; | |
426 | return 0; | |
427 | } else { | |
4e0a8fa2 | 428 | log_err("fio: incorrect idle-prof option: %s\n", args); |
f2a2ce0e HL |
429 | return -1; |
430 | } | |
431 | #else | |
432 | log_err("fio: idle-prof not supported on this platform\n"); | |
433 | return -1; | |
434 | #endif | |
435 | } | |
436 | ||
437 | void show_idle_prof_stats(int output, struct json_object *parent) | |
438 | { | |
439 | int i, nr_cpus = ipc.nr_cpus; | |
440 | struct json_object *tmp; | |
441 | char s[MAX_CPU_STR_LEN]; | |
680b5abc | 442 | |
f2a2ce0e HL |
443 | if (output == FIO_OUTPUT_NORMAL) { |
444 | if (ipc.opt > IDLE_PROF_OPT_CALI) | |
445 | log_info("\nCPU idleness:\n"); | |
446 | else if (ipc.opt == IDLE_PROF_OPT_CALI) | |
447 | log_info("CPU idleness:\n"); | |
448 | ||
449 | if (ipc.opt >= IDLE_PROF_OPT_SYSTEM) | |
450 | log_info(" system: %3.2f%%\n", fio_idle_prof_cpu_stat(-1)); | |
451 | ||
452 | if (ipc.opt == IDLE_PROF_OPT_PERCPU) { | |
453 | log_info(" percpu: %3.2f%%", fio_idle_prof_cpu_stat(0)); | |
680b5abc | 454 | for (i = 1; i < nr_cpus; i++) |
f2a2ce0e | 455 | log_info(", %3.2f%%", fio_idle_prof_cpu_stat(i)); |
f2a2ce0e HL |
456 | log_info("\n"); |
457 | } | |
458 | ||
459 | if (ipc.opt >= IDLE_PROF_OPT_CALI) { | |
460 | log_info(" unit work: mean=%3.2fus,", ipc.cali_mean); | |
461 | log_info(" stddev=%3.2f\n", ipc.cali_stddev); | |
462 | } | |
463 | ||
464 | /* dynamic mem allocations can now be freed */ | |
465 | if (ipc.opt != IDLE_PROF_OPT_NONE) | |
466 | fio_idle_prof_cleanup(); | |
467 | ||
468 | return; | |
469 | } | |
680b5abc | 470 | |
f2a2ce0e HL |
471 | if ((ipc.opt != IDLE_PROF_OPT_NONE) && (output == FIO_OUTPUT_JSON)) { |
472 | if (!parent) | |
473 | return; | |
474 | ||
475 | tmp = json_create_object(); | |
476 | if (!tmp) | |
477 | return; | |
478 | ||
479 | json_object_add_value_object(parent, "cpu_idleness", tmp); | |
480 | json_object_add_value_float(tmp, "system", fio_idle_prof_cpu_stat(-1)); | |
481 | ||
482 | if (ipc.opt == IDLE_PROF_OPT_PERCPU) { | |
680b5abc | 483 | for (i = 0; i < nr_cpus; i++) { |
f2a2ce0e HL |
484 | snprintf(s, MAX_CPU_STR_LEN, "cpu-%d", i); |
485 | json_object_add_value_float(tmp, s, fio_idle_prof_cpu_stat(i)); | |
486 | } | |
487 | } | |
488 | ||
489 | json_object_add_value_float(tmp, "unit_mean", ipc.cali_mean); | |
490 | json_object_add_value_float(tmp, "unit_stddev", ipc.cali_stddev); | |
491 | ||
492 | fio_idle_prof_cleanup(); | |
f2a2ce0e HL |
493 | } |
494 | } |