tools/perf/util/stat.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <errno.h>
   3 #include <linux/err.h>
   4 #include <inttypes.h>
   5 #include <math.h>
   6 #include <string.h>
   7 #include "counts.h"
   8 #include "cpumap.h"
   9 #include "debug.h"
  10 #include "header.h"
  11 #include "stat.h"
  12 #include "session.h"
  13 #include "target.h"
  14 #include "evlist.h"
  15 #include "evsel.h"
  16 #include "thread_map.h"
  17 #include "hashmap.h"
  18 #include <linux/zalloc.h>
  19
  20 void update_stats(struct stats *stats, u64 val)
  21 {
  22         double delta;
  23
  24         stats->n++;
  25         delta = val - stats->mean;
  26         stats->mean += delta / stats->n;
  27         stats->M2 += delta*(val - stats->mean);
  28
  29         if (val > stats->max)
  30                 stats->max = val;
  31
  32         if (val < stats->min)
  33                 stats->min = val;
  34 }
  35
  36 double avg_stats(struct stats *stats)
  37 {
  38         return stats->mean;
  39 }
  40
  41 /*
  42  * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
  43  *
  44  *       (\Sum n_i^2) - ((\Sum n_i)^2)/n
  45  * s^2 = -------------------------------
  46  *                  n - 1
  47  *
  48  * http://en.wikipedia.org/wiki/Stddev
  49  *
  50  * The std dev of the mean is related to the std dev by:
  51  *
  52  *             s
  53  * s_mean = -------
  54  *          sqrt(n)
  55  *
  56  */
  57 double stddev_stats(struct stats *stats)
  58 {
  59         double variance, variance_mean;
  60
  61         if (stats->n < 2)
  62                 return 0.0;
  63
  64         variance = stats->M2 / (stats->n - 1);
  65         variance_mean = variance / stats->n;
  66
  67         return sqrt(variance_mean);
  68 }
  69
  70 double rel_stddev_stats(double stddev, double avg)
  71 {
  72         double pct = 0.0;
  73
  74         if (avg)
  75                 pct = 100.0 * stddev/avg;
  76
  77         return pct;
  78 }
  79
  80 bool __perf_stat_evsel__is(struct evsel *evsel, enum perf_stat_evsel_id id)
  81 {
  82         struct perf_stat_evsel *ps = evsel->stats;
  83
  84         return ps->id == id;
  85 }
  86
  87 #define ID(id, name) [PERF_STAT_EVSEL_ID__##id] = #name
  88 static const char *id_str[PERF_STAT_EVSEL_ID__MAX] = {
  89         ID(NONE,                x),
  90         ID(CYCLES_IN_TX,        cpu/cycles-t/),
  91         ID(TRANSACTION_START,   cpu/tx-start/),
  92         ID(ELISION_START,       cpu/el-start/),
  93         ID(CYCLES_IN_TX_CP,     cpu/cycles-ct/),
  94         ID(TOPDOWN_TOTAL_SLOTS, topdown-total-slots),
  95         ID(TOPDOWN_SLOTS_ISSUED, topdown-slots-issued),
  96         ID(TOPDOWN_SLOTS_RETIRED, topdown-slots-retired),
  97         ID(TOPDOWN_FETCH_BUBBLES, topdown-fetch-bubbles),
  98         ID(TOPDOWN_RECOVERY_BUBBLES, topdown-recovery-bubbles),
  99         ID(TOPDOWN_RETIRING, topdown-retiring),
 100         ID(TOPDOWN_BAD_SPEC, topdown-bad-spec),
 101         ID(TOPDOWN_FE_BOUND, topdown-fe-bound),
 102         ID(TOPDOWN_BE_BOUND, topdown-be-bound),
 103         ID(TOPDOWN_HEAVY_OPS, topdown-heavy-ops),
 104         ID(TOPDOWN_BR_MISPREDICT, topdown-br-mispredict),
 105         ID(TOPDOWN_FETCH_LAT, topdown-fetch-lat),
 106         ID(TOPDOWN_MEM_BOUND, topdown-mem-bound),
 107         ID(SMI_NUM, msr/smi/),
 108         ID(APERF, msr/aperf/),
 109 };
 110 #undef ID
 111
 112 static void perf_stat_evsel_id_init(struct evsel *evsel)
 113 {
 114         struct perf_stat_evsel *ps = evsel->stats;
 115         int i;
 116
 117         /* ps->id is 0 hence PERF_STAT_EVSEL_ID__NONE by default */
 118
 119         for (i = 0; i < PERF_STAT_EVSEL_ID__MAX; i++) {
 120                 if (!strcmp(evsel__name(evsel), id_str[i])) {
 121                         ps->id = i;
 122                         break;
 123                 }
 124         }
 125 }
 126
 127 static void evsel__reset_stat_priv(struct evsel *evsel)
 128 {
 129         int i;
 130         struct perf_stat_evsel *ps = evsel->stats;
 131
 132         for (i = 0; i < 3; i++)
 133                 init_stats(&ps->res_stats[i]);
 134
 135         perf_stat_evsel_id_init(evsel);
 136 }
 137
 138 static int evsel__alloc_stat_priv(struct evsel *evsel)
 139 {
 140         evsel->stats = zalloc(sizeof(struct perf_stat_evsel));
 141         if (evsel->stats == NULL)
 142                 return -ENOMEM;
 143         evsel__reset_stat_priv(evsel);
 144         return 0;
 145 }
 146
 147 static void evsel__free_stat_priv(struct evsel *evsel)
 148 {
 149         struct perf_stat_evsel *ps = evsel->stats;
 150
 151         if (ps)
 152                 zfree(&ps->group_data);
 153         zfree(&evsel->stats);
 154 }
 155
 156 static int evsel__alloc_prev_raw_counts(struct evsel *evsel)
 157 {
 158         int cpu_map_nr = evsel__nr_cpus(evsel);
 159         int nthreads = perf_thread_map__nr(evsel->core.threads);
 160         struct perf_counts *counts;
 161
 162         counts = perf_counts__new(cpu_map_nr, nthreads);
 163         if (counts)
 164                 evsel->prev_raw_counts = counts;
 165
 166         return counts ? 0 : -ENOMEM;
 167 }
 168
 169 static void evsel__free_prev_raw_counts(struct evsel *evsel)
 170 {
 171         perf_counts__delete(evsel->prev_raw_counts);
 172         evsel->prev_raw_counts = NULL;
 173 }
 174
 175 static void evsel__reset_prev_raw_counts(struct evsel *evsel)
 176 {
 177         if (evsel->prev_raw_counts)
 178                 perf_counts__reset(evsel->prev_raw_counts);
 179 }
 180
 181 static int evsel__alloc_stats(struct evsel *evsel, bool alloc_raw)
 182 {
 183         if (evsel__alloc_stat_priv(evsel) < 0 ||
 184             evsel__alloc_counts(evsel) < 0 ||
 185             (alloc_raw && evsel__alloc_prev_raw_counts(evsel) < 0))
 186                 return -ENOMEM;
 187
 188         return 0;
 189 }
 190
 191 int evlist__alloc_stats(struct evlist *evlist, bool alloc_raw)
 192 {
 193         struct evsel *evsel;
 194
 195         evlist__for_each_entry(evlist, evsel) {
 196                 if (evsel__alloc_stats(evsel, alloc_raw))
 197                         goto out_free;
 198         }
 199
 200         return 0;
 201
 202 out_free:
 203         evlist__free_stats(evlist);
 204         return -1;
 205 }
 206
 207 void evlist__free_stats(struct evlist *evlist)
 208 {
 209         struct evsel *evsel;
 210
 211         evlist__for_each_entry(evlist, evsel) {
 212                 evsel__free_stat_priv(evsel);
 213                 evsel__free_counts(evsel);
 214                 evsel__free_prev_raw_counts(evsel);
 215         }
 216 }
 217
 218 void evlist__reset_stats(struct evlist *evlist)
 219 {
 220         struct evsel *evsel;
 221
 222         evlist__for_each_entry(evlist, evsel) {
 223                 evsel__reset_stat_priv(evsel);
 224                 evsel__reset_counts(evsel);
 225         }
 226 }
 227
 228 void evlist__reset_prev_raw_counts(struct evlist *evlist)
 229 {
 230         struct evsel *evsel;
 231
 232         evlist__for_each_entry(evlist, evsel)
 233                 evsel__reset_prev_raw_counts(evsel);
 234 }
 235
 236 static void evsel__copy_prev_raw_counts(struct evsel *evsel)
 237 {
 238         int ncpus = evsel__nr_cpus(evsel);
 239         int nthreads = perf_thread_map__nr(evsel->core.threads);
 240
 241         for (int thread = 0; thread < nthreads; thread++) {
 242                 for (int cpu = 0; cpu < ncpus; cpu++) {
 243                         *perf_counts(evsel->counts, cpu, thread) =
 244                                 *perf_counts(evsel->prev_raw_counts, cpu,
 245                                              thread);
 246                 }
 247         }
 248
 249         evsel->counts->aggr = evsel->prev_raw_counts->aggr;
 250 }
 251
 252 void evlist__copy_prev_raw_counts(struct evlist *evlist)
 253 {
 254         struct evsel *evsel;
 255
 256         evlist__for_each_entry(evlist, evsel)
 257                 evsel__copy_prev_raw_counts(evsel);
 258 }
 259
 260 void evlist__save_aggr_prev_raw_counts(struct evlist *evlist)
 261 {
 262         struct evsel *evsel;
 263
 264         /*
 265          * To collect the overall statistics for interval mode,
 266          * we copy the counts from evsel->prev_raw_counts to
 267          * evsel->counts. The perf_stat_process_counter creates
 268          * aggr values from per cpu values, but the per cpu values
 269          * are 0 for AGGR_GLOBAL. So we use a trick that saves the
 270          * previous aggr value to the first member of perf_counts,
 271          * then aggr calculation in process_counter_values can work
 272          * correctly.
 273          */
 274         evlist__for_each_entry(evlist, evsel) {
 275                 *perf_counts(evsel->prev_raw_counts, 0, 0) =
 276                         evsel->prev_raw_counts->aggr;
 277         }
 278 }
 279
 280 static size_t pkg_id_hash(const void *__key, void *ctx __maybe_unused)
 281 {
 282         uint64_t *key = (uint64_t *) __key;
 283
 284         return *key & 0xffffffff;
 285 }
 286
 287 static bool pkg_id_equal(const void *__key1, const void *__key2,
 288                          void *ctx __maybe_unused)
 289 {
 290         uint64_t *key1 = (uint64_t *) __key1;
 291         uint64_t *key2 = (uint64_t *) __key2;
 292
 293         return *key1 == *key2;
 294 }
 295
 296 static int check_per_pkg(struct evsel *counter, struct perf_counts_values *vals,
 297                          int cpu_map_idx, bool *skip)
 298 {
 299         struct hashmap *mask = counter->per_pkg_mask;
 300         struct perf_cpu_map *cpus = evsel__cpus(counter);
 301         struct perf_cpu cpu = perf_cpu_map__cpu(cpus, cpu_map_idx);
 302         int s, d, ret = 0;
 303         uint64_t *key;
 304
 305         *skip = false;
 306
 307         if (!counter->per_pkg)
 308                 return 0;
 309
 310         if (perf_cpu_map__empty(cpus))
 311                 return 0;
 312
 313         if (!mask) {
 314                 mask = hashmap__new(pkg_id_hash, pkg_id_equal, NULL);
 315                 if (IS_ERR(mask))
 316                         return -ENOMEM;
 317
 318                 counter->per_pkg_mask = mask;
 319         }
 320
 321         /*
 322          * we do not consider an event that has not run as a good
 323          * instance to mark a package as used (skip=1). Otherwise
 324          * we may run into a situation where the first CPU in a package
 325          * is not running anything, yet the second is, and this function
 326          * would mark the package as used after the first CPU and would
 327          * not read the values from the second CPU.
 328          */
 329         if (!(vals->run && vals->ena))
 330                 return 0;
 331
 332         s = cpu__get_socket_id(cpu);
 333         if (s < 0)
 334                 return -1;
 335
 336         /*
 337          * On multi-die system, die_id > 0. On no-die system, die_id = 0.
 338          * We use hashmap(socket, die) to check the used socket+die pair.
 339          */
 340         d = cpu__get_die_id(cpu);
 341         if (d < 0)
 342                 return -1;
 343
 344         key = malloc(sizeof(*key));
 345         if (!key)
 346                 return -ENOMEM;
 347
 348         *key = (uint64_t)d << 32 | s;
 349         if (hashmap__find(mask, (void *)key, NULL)) {
 350                 *skip = true;
 351                 free(key);
 352         } else
 353                 ret = hashmap__add(mask, (void *)key, (void *)1);
 354
 355         return ret;
 356 }
 357
 358 static int
 359 process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
 360                        int cpu_map_idx, int thread,
 361                        struct perf_counts_values *count)
 362 {
 363         struct perf_counts_values *aggr = &evsel->counts->aggr;
 364         static struct perf_counts_values zero;
 365         bool skip = false;
 366
 367         if (check_per_pkg(evsel, count, cpu_map_idx, &skip)) {
 368                 pr_err("failed to read per-pkg counter\n");
 369                 return -1;
 370         }
 371
 372         if (skip)
 373                 count = &zero;
 374
 375         switch (config->aggr_mode) {
 376         case AGGR_THREAD:
 377         case AGGR_CORE:
 378         case AGGR_DIE:
 379         case AGGR_SOCKET:
 380         case AGGR_NODE:
 381         case AGGR_NONE:
 382                 if (!evsel->snapshot)
 383                         evsel__compute_deltas(evsel, cpu_map_idx, thread, count);
 384                 perf_counts_values__scale(count, config->scale, NULL);
 385                 if ((config->aggr_mode == AGGR_NONE) && (!evsel->percore)) {
 386                         perf_stat__update_shadow_stats(evsel, count->val,
 387                                                        cpu_map_idx, &rt_stat);
 388                 }
 389
 390                 if (config->aggr_mode == AGGR_THREAD) {
 391                         if (config->stats)
 392                                 perf_stat__update_shadow_stats(evsel,
 393                                         count->val, 0, &config->stats[thread]);
 394                         else
 395                                 perf_stat__update_shadow_stats(evsel,
 396                                         count->val, 0, &rt_stat);
 397                 }
 398                 break;
 399         case AGGR_GLOBAL:
 400                 aggr->val += count->val;
 401                 aggr->ena += count->ena;
 402                 aggr->run += count->run;
 403         case AGGR_UNSET:
 404         default:
 405                 break;
 406         }
 407
 408         return 0;
 409 }
 410
 411 static int process_counter_maps(struct perf_stat_config *config,
 412                                 struct evsel *counter)
 413 {
 414         int nthreads = perf_thread_map__nr(counter->core.threads);
 415         int ncpus = evsel__nr_cpus(counter);
 416         int idx, thread;
 417
 418         if (counter->core.system_wide)
 419                 nthreads = 1;
 420
 421         for (thread = 0; thread < nthreads; thread++) {
 422                 for (idx = 0; idx < ncpus; idx++) {
 423                         if (process_counter_values(config, counter, idx, thread,
 424                                                    perf_counts(counter->counts, idx, thread)))
 425                                 return -1;
 426                 }
 427         }
 428
 429         return 0;
 430 }
 431
 432 int perf_stat_process_counter(struct perf_stat_config *config,
 433                               struct evsel *counter)
 434 {
 435         struct perf_counts_values *aggr = &counter->counts->aggr;
 436         struct perf_stat_evsel *ps = counter->stats;
 437         u64 *count = counter->counts->aggr.values;
 438         int i, ret;
 439
 440         aggr->val = aggr->ena = aggr->run = 0;
 441
 442         if (counter->per_pkg)
 443                 evsel__zero_per_pkg(counter);
 444
 445         ret = process_counter_maps(config, counter);
 446         if (ret)
 447                 return ret;
 448
 449         if (config->aggr_mode != AGGR_GLOBAL)
 450                 return 0;
 451
 452         if (!counter->snapshot)
 453                 evsel__compute_deltas(counter, -1, -1, aggr);
 454         perf_counts_values__scale(aggr, config->scale, &counter->counts->scaled);
 455
 456         for (i = 0; i < 3; i++)
 457                 update_stats(&ps->res_stats[i], count[i]);
 458
 459         if (verbose > 0) {
 460                 fprintf(config->output, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
 461                         evsel__name(counter), count[0], count[1], count[2]);
 462         }
 463
 464         /*
 465          * Save the full runtime - to allow normalization during printout:
 466          */
 467         perf_stat__update_shadow_stats(counter, *count, 0, &rt_stat);
 468
 469         return 0;
 470 }
 471
 472 int perf_event__process_stat_event(struct perf_session *session,
 473                                    union perf_event *event)
 474 {
 475         struct perf_counts_values count;
 476         struct perf_record_stat *st = &event->stat;
 477         struct evsel *counter;
 478
 479         count.val = st->val;
 480         count.ena = st->ena;
 481         count.run = st->run;
 482
 483         counter = evlist__id2evsel(session->evlist, st->id);
 484         if (!counter) {
 485                 pr_err("Failed to resolve counter for stat event.\n");
 486                 return -EINVAL;
 487         }
 488
 489         *perf_counts(counter->counts, st->cpu, st->thread) = count;
 490         counter->supported = true;
 491         return 0;
 492 }
 493
 494 size_t perf_event__fprintf_stat(union perf_event *event, FILE *fp)
 495 {
 496         struct perf_record_stat *st = (struct perf_record_stat *)event;
 497         size_t ret;
 498
 499         ret  = fprintf(fp, "\n... id %" PRI_lu64 ", cpu %d, thread %d\n",
 500                        st->id, st->cpu, st->thread);
 501         ret += fprintf(fp, "... value %" PRI_lu64 ", enabled %" PRI_lu64 ", running %" PRI_lu64 "\n",
 502                        st->val, st->ena, st->run);
 503
 504         return ret;
 505 }
 506
 507 size_t perf_event__fprintf_stat_round(union perf_event *event, FILE *fp)
 508 {
 509         struct perf_record_stat_round *rd = (struct perf_record_stat_round *)event;
 510         size_t ret;
 511
 512         ret = fprintf(fp, "\n... time %" PRI_lu64 ", type %s\n", rd->time,
 513                       rd->type == PERF_STAT_ROUND_TYPE__FINAL ? "FINAL" : "INTERVAL");
 514
 515         return ret;
 516 }
 517
 518 size_t perf_event__fprintf_stat_config(union perf_event *event, FILE *fp)
 519 {
 520         struct perf_stat_config sc;
 521         size_t ret;
 522
 523         perf_event__read_stat_config(&sc, &event->stat_config);
 524
 525         ret  = fprintf(fp, "\n");
 526         ret += fprintf(fp, "... aggr_mode %d\n", sc.aggr_mode);
 527         ret += fprintf(fp, "... scale     %d\n", sc.scale);
 528         ret += fprintf(fp, "... interval  %u\n", sc.interval);
 529
 530         return ret;
 531 }
 532
 533 int create_perf_stat_counter(struct evsel *evsel,
 534                              struct perf_stat_config *config,
 535                              struct target *target,
 536                              int cpu_map_idx)
 537 {
 538         struct perf_event_attr *attr = &evsel->core.attr;
 539         struct evsel *leader = evsel__leader(evsel);
 540
 541         attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
 542                             PERF_FORMAT_TOTAL_TIME_RUNNING;
 543
 544         /*
 545          * The event is part of non trivial group, let's enable
 546          * the group read (for leader) and ID retrieval for all
 547          * members.
 548          */
 549         if (leader->core.nr_members > 1)
 550                 attr->read_format |= PERF_FORMAT_ID|PERF_FORMAT_GROUP;
 551
 552         attr->inherit = !config->no_inherit && list_empty(&evsel->bpf_counter_list);
 553
 554         /*
 555          * Some events get initialized with sample_(period/type) set,
 556          * like tracepoints. Clear it up for counting.
 557          */
 558         attr->sample_period = 0;
 559
 560         if (config->identifier)
 561                 attr->sample_type = PERF_SAMPLE_IDENTIFIER;
 562
 563         if (config->all_user) {
 564                 attr->exclude_kernel = 1;
 565                 attr->exclude_user   = 0;
 566         }
 567
 568         if (config->all_kernel) {
 569                 attr->exclude_kernel = 0;
 570                 attr->exclude_user   = 1;
 571         }
 572
 573         /*
 574          * Disabling all counters initially, they will be enabled
 575          * either manually by us or by kernel via enable_on_exec
 576          * set later.
 577          */
 578         if (evsel__is_group_leader(evsel)) {
 579                 attr->disabled = 1;
 580
 581                 /*
 582                  * In case of initial_delay we enable tracee
 583                  * events manually.
 584                  */
 585                 if (target__none(target) && !config->initial_delay)
 586                         attr->enable_on_exec = 1;
 587         }
 588
 589         if (target__has_cpu(target) && !target__has_per_thread(target))
 590                 return evsel__open_per_cpu(evsel, evsel__cpus(evsel), cpu_map_idx);
 591
 592         return evsel__open_per_thread(evsel, evsel->core.threads);
 593 }