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