1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <inttypes.h> 4 #include <math.h> 5 #include <string.h> 6 #include "counts.h" 7 #include "cpumap.h" 8 #include "debug.h" 9 #include "header.h" 10 #include "stat.h" 11 #include "session.h" 12 #include "target.h" 13 #include "evlist.h" 14 #include "evsel.h" 15 #include "thread_map.h" 16 #include <linux/zalloc.h> 17 18 void update_stats(struct stats *stats, u64 val) 19 { 20 double delta; 21 22 stats->n++; 23 delta = val - stats->mean; 24 stats->mean += delta / stats->n; 25 stats->M2 += delta*(val - stats->mean); 26 27 if (val > stats->max) 28 stats->max = val; 29 30 if (val < stats->min) 31 stats->min = val; 32 } 33 34 double avg_stats(struct stats *stats) 35 { 36 return stats->mean; 37 } 38 39 /* 40 * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance 41 * 42 * (\Sum n_i^2) - ((\Sum n_i)^2)/n 43 * s^2 = ------------------------------- 44 * n - 1 45 * 46 * http://en.wikipedia.org/wiki/Stddev 47 * 48 * The std dev of the mean is related to the std dev by: 49 * 50 * s 51 * s_mean = ------- 52 * sqrt(n) 53 * 54 */ 55 double stddev_stats(struct stats *stats) 56 { 57 double variance, variance_mean; 58 59 if (stats->n < 2) 60 return 0.0; 61 62 variance = stats->M2 / (stats->n - 1); 63 variance_mean = variance / stats->n; 64 65 return sqrt(variance_mean); 66 } 67 68 double rel_stddev_stats(double stddev, double avg) 69 { 70 double pct = 0.0; 71 72 if (avg) 73 pct = 100.0 * stddev/avg; 74 75 return pct; 76 } 77 78 bool __perf_evsel_stat__is(struct evsel *evsel, 79 enum perf_stat_evsel_id id) 80 { 81 struct perf_stat_evsel *ps = evsel->stats; 82 83 return ps->id == id; 84 } 85 86 #define ID(id, name) [PERF_STAT_EVSEL_ID__##id] = #name 87 static const char *id_str[PERF_STAT_EVSEL_ID__MAX] = { 88 ID(NONE, x), 89 ID(CYCLES_IN_TX, cpu/cycles-t/), 90 ID(TRANSACTION_START, cpu/tx-start/), 91 ID(ELISION_START, cpu/el-start/), 92 ID(CYCLES_IN_TX_CP, cpu/cycles-ct/), 93 ID(TOPDOWN_TOTAL_SLOTS, topdown-total-slots), 94 ID(TOPDOWN_SLOTS_ISSUED, topdown-slots-issued), 95 ID(TOPDOWN_SLOTS_RETIRED, topdown-slots-retired), 96 ID(TOPDOWN_FETCH_BUBBLES, topdown-fetch-bubbles), 97 ID(TOPDOWN_RECOVERY_BUBBLES, topdown-recovery-bubbles), 98 ID(SMI_NUM, msr/smi/), 99 ID(APERF, msr/aperf/), 100 }; 101 #undef ID 102 103 static void perf_stat_evsel_id_init(struct evsel *evsel) 104 { 105 struct perf_stat_evsel *ps = evsel->stats; 106 int i; 107 108 /* ps->id is 0 hence PERF_STAT_EVSEL_ID__NONE by default */ 109 110 for (i = 0; i < PERF_STAT_EVSEL_ID__MAX; i++) { 111 if (!strcmp(perf_evsel__name(evsel), id_str[i])) { 112 ps->id = i; 113 break; 114 } 115 } 116 } 117 118 static void perf_evsel__reset_stat_priv(struct evsel *evsel) 119 { 120 int i; 121 struct perf_stat_evsel *ps = evsel->stats; 122 123 for (i = 0; i < 3; i++) 124 init_stats(&ps->res_stats[i]); 125 126 perf_stat_evsel_id_init(evsel); 127 } 128 129 static int perf_evsel__alloc_stat_priv(struct evsel *evsel) 130 { 131 evsel->stats = zalloc(sizeof(struct perf_stat_evsel)); 132 if (evsel->stats == NULL) 133 return -ENOMEM; 134 perf_evsel__reset_stat_priv(evsel); 135 return 0; 136 } 137 138 static void perf_evsel__free_stat_priv(struct evsel *evsel) 139 { 140 struct perf_stat_evsel *ps = evsel->stats; 141 142 if (ps) 143 zfree(&ps->group_data); 144 zfree(&evsel->stats); 145 } 146 147 static int perf_evsel__alloc_prev_raw_counts(struct evsel *evsel, 148 int ncpus, int nthreads) 149 { 150 struct perf_counts *counts; 151 152 counts = perf_counts__new(ncpus, nthreads); 153 if (counts) 154 evsel->prev_raw_counts = counts; 155 156 return counts ? 0 : -ENOMEM; 157 } 158 159 static void perf_evsel__free_prev_raw_counts(struct evsel *evsel) 160 { 161 perf_counts__delete(evsel->prev_raw_counts); 162 evsel->prev_raw_counts = NULL; 163 } 164 165 static void perf_evsel__reset_prev_raw_counts(struct evsel *evsel) 166 { 167 if (evsel->prev_raw_counts) { 168 evsel->prev_raw_counts->aggr.val = 0; 169 evsel->prev_raw_counts->aggr.ena = 0; 170 evsel->prev_raw_counts->aggr.run = 0; 171 } 172 } 173 174 static int perf_evsel__alloc_stats(struct evsel *evsel, bool alloc_raw) 175 { 176 int ncpus = perf_evsel__nr_cpus(evsel); 177 int nthreads = perf_thread_map__nr(evsel->core.threads); 178 179 if (perf_evsel__alloc_stat_priv(evsel) < 0 || 180 perf_evsel__alloc_counts(evsel, ncpus, nthreads) < 0 || 181 (alloc_raw && perf_evsel__alloc_prev_raw_counts(evsel, ncpus, nthreads) < 0)) 182 return -ENOMEM; 183 184 return 0; 185 } 186 187 int perf_evlist__alloc_stats(struct evlist *evlist, bool alloc_raw) 188 { 189 struct evsel *evsel; 190 191 evlist__for_each_entry(evlist, evsel) { 192 if (perf_evsel__alloc_stats(evsel, alloc_raw)) 193 goto out_free; 194 } 195 196 return 0; 197 198 out_free: 199 perf_evlist__free_stats(evlist); 200 return -1; 201 } 202 203 void perf_evlist__free_stats(struct evlist *evlist) 204 { 205 struct evsel *evsel; 206 207 evlist__for_each_entry(evlist, evsel) { 208 perf_evsel__free_stat_priv(evsel); 209 perf_evsel__free_counts(evsel); 210 perf_evsel__free_prev_raw_counts(evsel); 211 } 212 } 213 214 void perf_evlist__reset_stats(struct evlist *evlist) 215 { 216 struct evsel *evsel; 217 218 evlist__for_each_entry(evlist, evsel) { 219 perf_evsel__reset_stat_priv(evsel); 220 perf_evsel__reset_counts(evsel); 221 } 222 } 223 224 void perf_evlist__reset_prev_raw_counts(struct evlist *evlist) 225 { 226 struct evsel *evsel; 227 228 evlist__for_each_entry(evlist, evsel) 229 perf_evsel__reset_prev_raw_counts(evsel); 230 } 231 232 static void zero_per_pkg(struct evsel *counter) 233 { 234 if (counter->per_pkg_mask) 235 memset(counter->per_pkg_mask, 0, cpu__max_cpu()); 236 } 237 238 static int check_per_pkg(struct evsel *counter, 239 struct perf_counts_values *vals, int cpu, bool *skip) 240 { 241 unsigned long *mask = counter->per_pkg_mask; 242 struct perf_cpu_map *cpus = evsel__cpus(counter); 243 int s; 244 245 *skip = false; 246 247 if (!counter->per_pkg) 248 return 0; 249 250 if (perf_cpu_map__empty(cpus)) 251 return 0; 252 253 if (!mask) { 254 mask = zalloc(cpu__max_cpu()); 255 if (!mask) 256 return -ENOMEM; 257 258 counter->per_pkg_mask = mask; 259 } 260 261 /* 262 * we do not consider an event that has not run as a good 263 * instance to mark a package as used (skip=1). Otherwise 264 * we may run into a situation where the first CPU in a package 265 * is not running anything, yet the second is, and this function 266 * would mark the package as used after the first CPU and would 267 * not read the values from the second CPU. 268 */ 269 if (!(vals->run && vals->ena)) 270 return 0; 271 272 s = cpu_map__get_socket(cpus, cpu, NULL); 273 if (s < 0) 274 return -1; 275 276 *skip = test_and_set_bit(s, mask) == 1; 277 return 0; 278 } 279 280 static int 281 process_counter_values(struct perf_stat_config *config, struct evsel *evsel, 282 int cpu, int thread, 283 struct perf_counts_values *count) 284 { 285 struct perf_counts_values *aggr = &evsel->counts->aggr; 286 static struct perf_counts_values zero; 287 bool skip = false; 288 289 if (check_per_pkg(evsel, count, cpu, &skip)) { 290 pr_err("failed to read per-pkg counter\n"); 291 return -1; 292 } 293 294 if (skip) 295 count = &zero; 296 297 switch (config->aggr_mode) { 298 case AGGR_THREAD: 299 case AGGR_CORE: 300 case AGGR_DIE: 301 case AGGR_SOCKET: 302 case AGGR_NODE: 303 case AGGR_NONE: 304 if (!evsel->snapshot) 305 perf_evsel__compute_deltas(evsel, cpu, thread, count); 306 perf_counts_values__scale(count, config->scale, NULL); 307 if ((config->aggr_mode == AGGR_NONE) && (!evsel->percore)) { 308 perf_stat__update_shadow_stats(evsel, count->val, 309 cpu, &rt_stat); 310 } 311 312 if (config->aggr_mode == AGGR_THREAD) { 313 if (config->stats) 314 perf_stat__update_shadow_stats(evsel, 315 count->val, 0, &config->stats[thread]); 316 else 317 perf_stat__update_shadow_stats(evsel, 318 count->val, 0, &rt_stat); 319 } 320 break; 321 case AGGR_GLOBAL: 322 aggr->val += count->val; 323 aggr->ena += count->ena; 324 aggr->run += count->run; 325 case AGGR_UNSET: 326 default: 327 break; 328 } 329 330 return 0; 331 } 332 333 static int process_counter_maps(struct perf_stat_config *config, 334 struct evsel *counter) 335 { 336 int nthreads = perf_thread_map__nr(counter->core.threads); 337 int ncpus = perf_evsel__nr_cpus(counter); 338 int cpu, thread; 339 340 if (counter->core.system_wide) 341 nthreads = 1; 342 343 for (thread = 0; thread < nthreads; thread++) { 344 for (cpu = 0; cpu < ncpus; cpu++) { 345 if (process_counter_values(config, counter, cpu, thread, 346 perf_counts(counter->counts, cpu, thread))) 347 return -1; 348 } 349 } 350 351 return 0; 352 } 353 354 int perf_stat_process_counter(struct perf_stat_config *config, 355 struct evsel *counter) 356 { 357 struct perf_counts_values *aggr = &counter->counts->aggr; 358 struct perf_stat_evsel *ps = counter->stats; 359 u64 *count = counter->counts->aggr.values; 360 int i, ret; 361 362 aggr->val = aggr->ena = aggr->run = 0; 363 364 /* 365 * We calculate counter's data every interval, 366 * and the display code shows ps->res_stats 367 * avg value. We need to zero the stats for 368 * interval mode, otherwise overall avg running 369 * averages will be shown for each interval. 370 */ 371 if (config->interval) 372 init_stats(ps->res_stats); 373 374 if (counter->per_pkg) 375 zero_per_pkg(counter); 376 377 ret = process_counter_maps(config, counter); 378 if (ret) 379 return ret; 380 381 if (config->aggr_mode != AGGR_GLOBAL) 382 return 0; 383 384 if (!counter->snapshot) 385 perf_evsel__compute_deltas(counter, -1, -1, aggr); 386 perf_counts_values__scale(aggr, config->scale, &counter->counts->scaled); 387 388 for (i = 0; i < 3; i++) 389 update_stats(&ps->res_stats[i], count[i]); 390 391 if (verbose > 0) { 392 fprintf(config->output, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n", 393 perf_evsel__name(counter), count[0], count[1], count[2]); 394 } 395 396 /* 397 * Save the full runtime - to allow normalization during printout: 398 */ 399 perf_stat__update_shadow_stats(counter, *count, 0, &rt_stat); 400 401 return 0; 402 } 403 404 int perf_event__process_stat_event(struct perf_session *session, 405 union perf_event *event) 406 { 407 struct perf_counts_values count; 408 struct perf_record_stat *st = &event->stat; 409 struct evsel *counter; 410 411 count.val = st->val; 412 count.ena = st->ena; 413 count.run = st->run; 414 415 counter = perf_evlist__id2evsel(session->evlist, st->id); 416 if (!counter) { 417 pr_err("Failed to resolve counter for stat event.\n"); 418 return -EINVAL; 419 } 420 421 *perf_counts(counter->counts, st->cpu, st->thread) = count; 422 counter->supported = true; 423 return 0; 424 } 425 426 size_t perf_event__fprintf_stat(union perf_event *event, FILE *fp) 427 { 428 struct perf_record_stat *st = (struct perf_record_stat *)event; 429 size_t ret; 430 431 ret = fprintf(fp, "\n... id %" PRI_lu64 ", cpu %d, thread %d\n", 432 st->id, st->cpu, st->thread); 433 ret += fprintf(fp, "... value %" PRI_lu64 ", enabled %" PRI_lu64 ", running %" PRI_lu64 "\n", 434 st->val, st->ena, st->run); 435 436 return ret; 437 } 438 439 size_t perf_event__fprintf_stat_round(union perf_event *event, FILE *fp) 440 { 441 struct perf_record_stat_round *rd = (struct perf_record_stat_round *)event; 442 size_t ret; 443 444 ret = fprintf(fp, "\n... time %" PRI_lu64 ", type %s\n", rd->time, 445 rd->type == PERF_STAT_ROUND_TYPE__FINAL ? "FINAL" : "INTERVAL"); 446 447 return ret; 448 } 449 450 size_t perf_event__fprintf_stat_config(union perf_event *event, FILE *fp) 451 { 452 struct perf_stat_config sc; 453 size_t ret; 454 455 perf_event__read_stat_config(&sc, &event->stat_config); 456 457 ret = fprintf(fp, "\n"); 458 ret += fprintf(fp, "... aggr_mode %d\n", sc.aggr_mode); 459 ret += fprintf(fp, "... scale %d\n", sc.scale); 460 ret += fprintf(fp, "... interval %u\n", sc.interval); 461 462 return ret; 463 } 464 465 int create_perf_stat_counter(struct evsel *evsel, 466 struct perf_stat_config *config, 467 struct target *target, 468 int cpu) 469 { 470 struct perf_event_attr *attr = &evsel->core.attr; 471 struct evsel *leader = evsel->leader; 472 473 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | 474 PERF_FORMAT_TOTAL_TIME_RUNNING; 475 476 /* 477 * The event is part of non trivial group, let's enable 478 * the group read (for leader) and ID retrieval for all 479 * members. 480 */ 481 if (leader->core.nr_members > 1) 482 attr->read_format |= PERF_FORMAT_ID|PERF_FORMAT_GROUP; 483 484 attr->inherit = !config->no_inherit; 485 486 /* 487 * Some events get initialized with sample_(period/type) set, 488 * like tracepoints. Clear it up for counting. 489 */ 490 attr->sample_period = 0; 491 492 if (config->identifier) 493 attr->sample_type = PERF_SAMPLE_IDENTIFIER; 494 495 if (config->all_user) { 496 attr->exclude_kernel = 1; 497 attr->exclude_user = 0; 498 } 499 500 if (config->all_kernel) { 501 attr->exclude_kernel = 0; 502 attr->exclude_user = 1; 503 } 504 505 /* 506 * Disabling all counters initially, they will be enabled 507 * either manually by us or by kernel via enable_on_exec 508 * set later. 509 */ 510 if (perf_evsel__is_group_leader(evsel)) { 511 attr->disabled = 1; 512 513 /* 514 * In case of initial_delay we enable tracee 515 * events manually. 516 */ 517 if (target__none(target) && !config->initial_delay) 518 attr->enable_on_exec = 1; 519 } 520 521 if (target__has_cpu(target) && !target__has_per_thread(target)) 522 return perf_evsel__open_per_cpu(evsel, evsel__cpus(evsel), cpu); 523 524 return perf_evsel__open_per_thread(evsel, evsel->core.threads); 525 } 526