tools/perf/util/evlist.c

   1 /*
   2  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   3  *
   4  * Parts came from builtin-{top,stat,record}.c, see those files for further
   5  * copyright notes.
   6  *
   7  * Released under the GPL v2. (and only v2, not any later version)
   8  */
   9 #include "util.h"
  10 #include "debugfs.h"
  11 #include <poll.h>
  12 #include "cpumap.h"
  13 #include "thread_map.h"
  14 #include "target.h"
  15 #include "evlist.h"
  16 #include "evsel.h"
  17 #include <unistd.h>
  18
  19 #include "parse-events.h"
  20
  21 #include <sys/mman.h>
  22
  23 #include <linux/bitops.h>
  24 #include <linux/hash.h>
  25
  26 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  27 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
  28
  29 void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
  30                        struct thread_map *threads)
  31 {
  32         int i;
  33
  34         for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
  35                 INIT_HLIST_HEAD(&evlist->heads[i]);
  36         INIT_LIST_HEAD(&evlist->entries);
  37         perf_evlist__set_maps(evlist, cpus, threads);
  38         evlist->workload.pid = -1;
  39 }
  40
  41 struct perf_evlist *perf_evlist__new(struct cpu_map *cpus,
  42                                      struct thread_map *threads)
  43 {
  44         struct perf_evlist *evlist = zalloc(sizeof(*evlist));
  45
  46         if (evlist != NULL)
  47                 perf_evlist__init(evlist, cpus, threads);
  48
  49         return evlist;
  50 }
  51
  52 void perf_evlist__config_attrs(struct perf_evlist *evlist,
  53                                struct perf_record_opts *opts)
  54 {
  55         struct perf_evsel *evsel;
  56
  57         if (evlist->cpus->map[0] < 0)
  58                 opts->no_inherit = true;
  59
  60         list_for_each_entry(evsel, &evlist->entries, node) {
  61                 perf_evsel__config(evsel, opts);
  62
  63                 if (evlist->nr_entries > 1)
  64                         perf_evsel__set_sample_id(evsel);
  65         }
  66 }
  67
  68 static void perf_evlist__purge(struct perf_evlist *evlist)
  69 {
  70         struct perf_evsel *pos, *n;
  71
  72         list_for_each_entry_safe(pos, n, &evlist->entries, node) {
  73                 list_del_init(&pos->node);
  74                 perf_evsel__delete(pos);
  75         }
  76
  77         evlist->nr_entries = 0;
  78 }
  79
  80 void perf_evlist__exit(struct perf_evlist *evlist)
  81 {
  82         free(evlist->mmap);
  83         free(evlist->pollfd);
  84         evlist->mmap = NULL;
  85         evlist->pollfd = NULL;
  86 }
  87
  88 void perf_evlist__delete(struct perf_evlist *evlist)
  89 {
  90         perf_evlist__purge(evlist);
  91         perf_evlist__exit(evlist);
  92         free(evlist);
  93 }
  94
  95 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
  96 {
  97         list_add_tail(&entry->node, &evlist->entries);
  98         ++evlist->nr_entries;
  99 }
 100
 101 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
 102                                    struct list_head *list,
 103                                    int nr_entries)
 104 {
 105         list_splice_tail(list, &evlist->entries);
 106         evlist->nr_entries += nr_entries;
 107 }
 108
 109 void __perf_evlist__set_leader(struct list_head *list)
 110 {
 111         struct perf_evsel *evsel, *leader;
 112
 113         leader = list_entry(list->next, struct perf_evsel, node);
 114
 115         list_for_each_entry(evsel, list, node) {
 116                 if (evsel != leader)
 117                         evsel->leader = leader;
 118         }
 119 }
 120
 121 void perf_evlist__set_leader(struct perf_evlist *evlist)
 122 {
 123         if (evlist->nr_entries)
 124                 __perf_evlist__set_leader(&evlist->entries);
 125 }
 126
 127 int perf_evlist__add_default(struct perf_evlist *evlist)
 128 {
 129         struct perf_event_attr attr = {
 130                 .type = PERF_TYPE_HARDWARE,
 131                 .config = PERF_COUNT_HW_CPU_CYCLES,
 132         };
 133         struct perf_evsel *evsel;
 134
 135         event_attr_init(&attr);
 136
 137         evsel = perf_evsel__new(&attr, 0);
 138         if (evsel == NULL)
 139                 goto error;
 140
 141         /* use strdup() because free(evsel) assumes name is allocated */
 142         evsel->name = strdup("cycles");
 143         if (!evsel->name)
 144                 goto error_free;
 145
 146         perf_evlist__add(evlist, evsel);
 147         return 0;
 148 error_free:
 149         perf_evsel__delete(evsel);
 150 error:
 151         return -ENOMEM;
 152 }
 153
 154 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
 155                                   struct perf_event_attr *attrs, size_t nr_attrs)
 156 {
 157         struct perf_evsel *evsel, *n;
 158         LIST_HEAD(head);
 159         size_t i;
 160
 161         for (i = 0; i < nr_attrs; i++) {
 162                 evsel = perf_evsel__new(attrs + i, evlist->nr_entries + i);
 163                 if (evsel == NULL)
 164                         goto out_delete_partial_list;
 165                 list_add_tail(&evsel->node, &head);
 166         }
 167
 168         perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
 169
 170         return 0;
 171
 172 out_delete_partial_list:
 173         list_for_each_entry_safe(evsel, n, &head, node)
 174                 perf_evsel__delete(evsel);
 175         return -1;
 176 }
 177
 178 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
 179                                      struct perf_event_attr *attrs, size_t nr_attrs)
 180 {
 181         size_t i;
 182
 183         for (i = 0; i < nr_attrs; i++)
 184                 event_attr_init(attrs + i);
 185
 186         return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
 187 }
 188
 189 struct perf_evsel *
 190 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
 191 {
 192         struct perf_evsel *evsel;
 193
 194         list_for_each_entry(evsel, &evlist->entries, node) {
 195                 if (evsel->attr.type   == PERF_TYPE_TRACEPOINT &&
 196                     (int)evsel->attr.config == id)
 197                         return evsel;
 198         }
 199
 200         return NULL;
 201 }
 202
 203 int perf_evlist__add_newtp(struct perf_evlist *evlist,
 204                            const char *sys, const char *name, void *handler)
 205 {
 206         struct perf_evsel *evsel;
 207
 208         evsel = perf_evsel__newtp(sys, name, evlist->nr_entries);
 209         if (evsel == NULL)
 210                 return -1;
 211
 212         evsel->handler.func = handler;
 213         perf_evlist__add(evlist, evsel);
 214         return 0;
 215 }
 216
 217 void perf_evlist__disable(struct perf_evlist *evlist)
 218 {
 219         int cpu, thread;
 220         struct perf_evsel *pos;
 221
 222         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 223                 list_for_each_entry(pos, &evlist->entries, node) {
 224                         if (!perf_evsel__is_group_leader(pos))
 225                                 continue;
 226                         for (thread = 0; thread < evlist->threads->nr; thread++)
 227                                 ioctl(FD(pos, cpu, thread),
 228                                       PERF_EVENT_IOC_DISABLE, 0);
 229                 }
 230         }
 231 }
 232
 233 void perf_evlist__enable(struct perf_evlist *evlist)
 234 {
 235         int cpu, thread;
 236         struct perf_evsel *pos;
 237
 238         for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
 239                 list_for_each_entry(pos, &evlist->entries, node) {
 240                         if (!perf_evsel__is_group_leader(pos))
 241                                 continue;
 242                         for (thread = 0; thread < evlist->threads->nr; thread++)
 243                                 ioctl(FD(pos, cpu, thread),
 244                                       PERF_EVENT_IOC_ENABLE, 0);
 245                 }
 246         }
 247 }
 248
 249 static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 250 {
 251         int nfds = cpu_map__nr(evlist->cpus) * evlist->threads->nr * evlist->nr_entries;
 252         evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
 253         return evlist->pollfd != NULL ? 0 : -ENOMEM;
 254 }
 255
 256 void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
 257 {
 258         fcntl(fd, F_SETFL, O_NONBLOCK);
 259         evlist->pollfd[evlist->nr_fds].fd = fd;
 260         evlist->pollfd[evlist->nr_fds].events = POLLIN;
 261         evlist->nr_fds++;
 262 }
 263
 264 static void perf_evlist__id_hash(struct perf_evlist *evlist,
 265                                  struct perf_evsel *evsel,
 266                                  int cpu, int thread, u64 id)
 267 {
 268         int hash;
 269         struct perf_sample_id *sid = SID(evsel, cpu, thread);
 270
 271         sid->id = id;
 272         sid->evsel = evsel;
 273         hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
 274         hlist_add_head(&sid->node, &evlist->heads[hash]);
 275 }
 276
 277 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
 278                          int cpu, int thread, u64 id)
 279 {
 280         perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
 281         evsel->id[evsel->ids++] = id;
 282 }
 283
 284 static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
 285                                   struct perf_evsel *evsel,
 286                                   int cpu, int thread, int fd)
 287 {
 288         u64 read_data[4] = { 0, };
 289         int id_idx = 1; /* The first entry is the counter value */
 290
 291         if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
 292             read(fd, &read_data, sizeof(read_data)) == -1)
 293                 return -1;
 294
 295         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 296                 ++id_idx;
 297         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 298                 ++id_idx;
 299
 300         perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]);
 301         return 0;
 302 }
 303
 304 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
 305 {
 306         struct hlist_head *head;
 307         struct hlist_node *pos;
 308         struct perf_sample_id *sid;
 309         int hash;
 310
 311         if (evlist->nr_entries == 1)
 312                 return perf_evlist__first(evlist);
 313
 314         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 315         head = &evlist->heads[hash];
 316
 317         hlist_for_each_entry(sid, pos, head, node)
 318                 if (sid->id == id)
 319                         return sid->evsel;
 320
 321         if (!perf_evlist__sample_id_all(evlist))
 322                 return perf_evlist__first(evlist);
 323
 324         return NULL;
 325 }
 326
 327 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 328 {
 329         struct perf_mmap *md = &evlist->mmap[idx];
 330         unsigned int head = perf_mmap__read_head(md);
 331         unsigned int old = md->prev;
 332         unsigned char *data = md->base + page_size;
 333         union perf_event *event = NULL;
 334
 335         if (evlist->overwrite) {
 336                 /*
 337                  * If we're further behind than half the buffer, there's a chance
 338                  * the writer will bite our tail and mess up the samples under us.
 339                  *
 340                  * If we somehow ended up ahead of the head, we got messed up.
 341                  *
 342                  * In either case, truncate and restart at head.
 343                  */
 344                 int diff = head - old;
 345                 if (diff > md->mask / 2 || diff < 0) {
 346                         fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
 347
 348                         /*
 349                          * head points to a known good entry, start there.
 350                          */
 351                         old = head;
 352                 }
 353         }
 354
 355         if (old != head) {
 356                 size_t size;
 357
 358                 event = (union perf_event *)&data[old & md->mask];
 359                 size = event->header.size;
 360
 361                 /*
 362                  * Event straddles the mmap boundary -- header should always
 363                  * be inside due to u64 alignment of output.
 364                  */
 365                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
 366                         unsigned int offset = old;
 367                         unsigned int len = min(sizeof(*event), size), cpy;
 368                         void *dst = &evlist->event_copy;
 369
 370                         do {
 371                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
 372                                 memcpy(dst, &data[offset & md->mask], cpy);
 373                                 offset += cpy;
 374                                 dst += cpy;
 375                                 len -= cpy;
 376                         } while (len);
 377
 378                         event = &evlist->event_copy;
 379                 }
 380
 381                 old += size;
 382         }
 383
 384         md->prev = old;
 385
 386         if (!evlist->overwrite)
 387                 perf_mmap__write_tail(md, old);
 388
 389         return event;
 390 }
 391
 392 void perf_evlist__munmap(struct perf_evlist *evlist)
 393 {
 394         int i;
 395
 396         for (i = 0; i < evlist->nr_mmaps; i++) {
 397                 if (evlist->mmap[i].base != NULL) {
 398                         munmap(evlist->mmap[i].base, evlist->mmap_len);
 399                         evlist->mmap[i].base = NULL;
 400                 }
 401         }
 402
 403         free(evlist->mmap);
 404         evlist->mmap = NULL;
 405 }
 406
 407 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
 408 {
 409         evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
 410         if (cpu_map__all(evlist->cpus))
 411                 evlist->nr_mmaps = evlist->threads->nr;
 412         evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
 413         return evlist->mmap != NULL ? 0 : -ENOMEM;
 414 }
 415
 416 static int __perf_evlist__mmap(struct perf_evlist *evlist,
 417                                int idx, int prot, int mask, int fd)
 418 {
 419         evlist->mmap[idx].prev = 0;
 420         evlist->mmap[idx].mask = mask;
 421         evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
 422                                       MAP_SHARED, fd, 0);
 423         if (evlist->mmap[idx].base == MAP_FAILED) {
 424                 evlist->mmap[idx].base = NULL;
 425                 return -1;
 426         }
 427
 428         perf_evlist__add_pollfd(evlist, fd);
 429         return 0;
 430 }
 431
 432 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
 433 {
 434         struct perf_evsel *evsel;
 435         int cpu, thread;
 436
 437         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 438                 int output = -1;
 439
 440                 for (thread = 0; thread < evlist->threads->nr; thread++) {
 441                         list_for_each_entry(evsel, &evlist->entries, node) {
 442                                 int fd = FD(evsel, cpu, thread);
 443
 444                                 if (output == -1) {
 445                                         output = fd;
 446                                         if (__perf_evlist__mmap(evlist, cpu,
 447                                                                 prot, mask, output) < 0)
 448                                                 goto out_unmap;
 449                                 } else {
 450                                         if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 451                                                 goto out_unmap;
 452                                 }
 453
 454                                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 455                                     perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
 456                                         goto out_unmap;
 457                         }
 458                 }
 459         }
 460
 461         return 0;
 462
 463 out_unmap:
 464         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 465                 if (evlist->mmap[cpu].base != NULL) {
 466                         munmap(evlist->mmap[cpu].base, evlist->mmap_len);
 467                         evlist->mmap[cpu].base = NULL;
 468                 }
 469         }
 470         return -1;
 471 }
 472
 473 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
 474 {
 475         struct perf_evsel *evsel;
 476         int thread;
 477
 478         for (thread = 0; thread < evlist->threads->nr; thread++) {
 479                 int output = -1;
 480
 481                 list_for_each_entry(evsel, &evlist->entries, node) {
 482                         int fd = FD(evsel, 0, thread);
 483
 484                         if (output == -1) {
 485                                 output = fd;
 486                                 if (__perf_evlist__mmap(evlist, thread,
 487                                                         prot, mask, output) < 0)
 488                                         goto out_unmap;
 489                         } else {
 490                                 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 491                                         goto out_unmap;
 492                         }
 493
 494                         if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 495                             perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
 496                                 goto out_unmap;
 497                 }
 498         }
 499
 500         return 0;
 501
 502 out_unmap:
 503         for (thread = 0; thread < evlist->threads->nr; thread++) {
 504                 if (evlist->mmap[thread].base != NULL) {
 505                         munmap(evlist->mmap[thread].base, evlist->mmap_len);
 506                         evlist->mmap[thread].base = NULL;
 507                 }
 508         }
 509         return -1;
 510 }
 511
 512 /** perf_evlist__mmap - Create per cpu maps to receive events
 513  *
 514  * @evlist - list of events
 515  * @pages - map length in pages
 516  * @overwrite - overwrite older events?
 517  *
 518  * If overwrite is false the user needs to signal event consuption using:
 519  *
 520  *      struct perf_mmap *m = &evlist->mmap[cpu];
 521  *      unsigned int head = perf_mmap__read_head(m);
 522  *
 523  *      perf_mmap__write_tail(m, head)
 524  *
 525  * Using perf_evlist__read_on_cpu does this automatically.
 526  */
 527 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
 528                       bool overwrite)
 529 {
 530         struct perf_evsel *evsel;
 531         const struct cpu_map *cpus = evlist->cpus;
 532         const struct thread_map *threads = evlist->threads;
 533         int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
 534
 535         /* 512 kiB: default amount of unprivileged mlocked memory */
 536         if (pages == UINT_MAX)
 537                 pages = (512 * 1024) / page_size;
 538         else if (!is_power_of_2(pages))
 539                 return -EINVAL;
 540
 541         mask = pages * page_size - 1;
 542
 543         if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
 544                 return -ENOMEM;
 545
 546         if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
 547                 return -ENOMEM;
 548
 549         evlist->overwrite = overwrite;
 550         evlist->mmap_len = (pages + 1) * page_size;
 551
 552         list_for_each_entry(evsel, &evlist->entries, node) {
 553                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 554                     evsel->sample_id == NULL &&
 555                     perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
 556                         return -ENOMEM;
 557         }
 558
 559         if (cpu_map__all(cpus))
 560                 return perf_evlist__mmap_per_thread(evlist, prot, mask);
 561
 562         return perf_evlist__mmap_per_cpu(evlist, prot, mask);
 563 }
 564
 565 int perf_evlist__create_maps(struct perf_evlist *evlist,
 566                              struct perf_target *target)
 567 {
 568         evlist->threads = thread_map__new_str(target->pid, target->tid,
 569                                               target->uid);
 570
 571         if (evlist->threads == NULL)
 572                 return -1;
 573
 574         if (perf_target__has_task(target))
 575                 evlist->cpus = cpu_map__dummy_new();
 576         else if (!perf_target__has_cpu(target) && !target->uses_mmap)
 577                 evlist->cpus = cpu_map__dummy_new();
 578         else
 579                 evlist->cpus = cpu_map__new(target->cpu_list);
 580
 581         if (evlist->cpus == NULL)
 582                 goto out_delete_threads;
 583
 584         return 0;
 585
 586 out_delete_threads:
 587         thread_map__delete(evlist->threads);
 588         return -1;
 589 }
 590
 591 void perf_evlist__delete_maps(struct perf_evlist *evlist)
 592 {
 593         cpu_map__delete(evlist->cpus);
 594         thread_map__delete(evlist->threads);
 595         evlist->cpus    = NULL;
 596         evlist->threads = NULL;
 597 }
 598
 599 int perf_evlist__apply_filters(struct perf_evlist *evlist)
 600 {
 601         struct perf_evsel *evsel;
 602         int err = 0;
 603         const int ncpus = cpu_map__nr(evlist->cpus),
 604                   nthreads = evlist->threads->nr;
 605
 606         list_for_each_entry(evsel, &evlist->entries, node) {
 607                 if (evsel->filter == NULL)
 608                         continue;
 609
 610                 err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
 611                 if (err)
 612                         break;
 613         }
 614
 615         return err;
 616 }
 617
 618 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
 619 {
 620         struct perf_evsel *evsel;
 621         int err = 0;
 622         const int ncpus = cpu_map__nr(evlist->cpus),
 623                   nthreads = evlist->threads->nr;
 624
 625         list_for_each_entry(evsel, &evlist->entries, node) {
 626                 err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
 627                 if (err)
 628                         break;
 629         }
 630
 631         return err;
 632 }
 633
 634 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
 635 {
 636         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 637
 638         list_for_each_entry_continue(pos, &evlist->entries, node) {
 639                 if (first->attr.sample_type != pos->attr.sample_type)
 640                         return false;
 641         }
 642
 643         return true;
 644 }
 645
 646 u64 perf_evlist__sample_type(struct perf_evlist *evlist)
 647 {
 648         struct perf_evsel *first = perf_evlist__first(evlist);
 649         return first->attr.sample_type;
 650 }
 651
 652 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
 653 {
 654         struct perf_evsel *first = perf_evlist__first(evlist);
 655         struct perf_sample *data;
 656         u64 sample_type;
 657         u16 size = 0;
 658
 659         if (!first->attr.sample_id_all)
 660                 goto out;
 661
 662         sample_type = first->attr.sample_type;
 663
 664         if (sample_type & PERF_SAMPLE_TID)
 665                 size += sizeof(data->tid) * 2;
 666
 667        if (sample_type & PERF_SAMPLE_TIME)
 668                 size += sizeof(data->time);
 669
 670         if (sample_type & PERF_SAMPLE_ID)
 671                 size += sizeof(data->id);
 672
 673         if (sample_type & PERF_SAMPLE_STREAM_ID)
 674                 size += sizeof(data->stream_id);
 675
 676         if (sample_type & PERF_SAMPLE_CPU)
 677                 size += sizeof(data->cpu) * 2;
 678 out:
 679         return size;
 680 }
 681
 682 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
 683 {
 684         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 685
 686         list_for_each_entry_continue(pos, &evlist->entries, node) {
 687                 if (first->attr.sample_id_all != pos->attr.sample_id_all)
 688                         return false;
 689         }
 690
 691         return true;
 692 }
 693
 694 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
 695 {
 696         struct perf_evsel *first = perf_evlist__first(evlist);
 697         return first->attr.sample_id_all;
 698 }
 699
 700 void perf_evlist__set_selected(struct perf_evlist *evlist,
 701                                struct perf_evsel *evsel)
 702 {
 703         evlist->selected = evsel;
 704 }
 705
 706 int perf_evlist__open(struct perf_evlist *evlist)
 707 {
 708         struct perf_evsel *evsel;
 709         int err, ncpus, nthreads;
 710
 711         list_for_each_entry(evsel, &evlist->entries, node) {
 712                 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
 713                 if (err < 0)
 714                         goto out_err;
 715         }
 716
 717         return 0;
 718 out_err:
 719         ncpus = evlist->cpus ? evlist->cpus->nr : 1;
 720         nthreads = evlist->threads ? evlist->threads->nr : 1;
 721
 722         list_for_each_entry_reverse(evsel, &evlist->entries, node)
 723                 perf_evsel__close(evsel, ncpus, nthreads);
 724
 725         errno = -err;
 726         return err;
 727 }
 728
 729 int perf_evlist__prepare_workload(struct perf_evlist *evlist,
 730                                   struct perf_record_opts *opts,
 731                                   const char *argv[])
 732 {
 733         int child_ready_pipe[2], go_pipe[2];
 734         char bf;
 735
 736         if (pipe(child_ready_pipe) < 0) {
 737                 perror("failed to create 'ready' pipe");
 738                 return -1;
 739         }
 740
 741         if (pipe(go_pipe) < 0) {
 742                 perror("failed to create 'go' pipe");
 743                 goto out_close_ready_pipe;
 744         }
 745
 746         evlist->workload.pid = fork();
 747         if (evlist->workload.pid < 0) {
 748                 perror("failed to fork");
 749                 goto out_close_pipes;
 750         }
 751
 752         if (!evlist->workload.pid) {
 753                 if (opts->pipe_output)
 754                         dup2(2, 1);
 755
 756                 close(child_ready_pipe[0]);
 757                 close(go_pipe[1]);
 758                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 759
 760                 /*
 761                  * Do a dummy execvp to get the PLT entry resolved,
 762                  * so we avoid the resolver overhead on the real
 763                  * execvp call.
 764                  */
 765                 execvp("", (char **)argv);
 766
 767                 /*
 768                  * Tell the parent we're ready to go
 769                  */
 770                 close(child_ready_pipe[1]);
 771
 772                 /*
 773                  * Wait until the parent tells us to go.
 774                  */
 775                 if (read(go_pipe[0], &bf, 1) == -1)
 776                         perror("unable to read pipe");
 777
 778                 execvp(argv[0], (char **)argv);
 779
 780                 perror(argv[0]);
 781                 kill(getppid(), SIGUSR1);
 782                 exit(-1);
 783         }
 784
 785         if (perf_target__none(&opts->target))
 786                 evlist->threads->map[0] = evlist->workload.pid;
 787
 788         close(child_ready_pipe[1]);
 789         close(go_pipe[0]);
 790         /*
 791          * wait for child to settle
 792          */
 793         if (read(child_ready_pipe[0], &bf, 1) == -1) {
 794                 perror("unable to read pipe");
 795                 goto out_close_pipes;
 796         }
 797
 798         evlist->workload.cork_fd = go_pipe[1];
 799         close(child_ready_pipe[0]);
 800         return 0;
 801
 802 out_close_pipes:
 803         close(go_pipe[0]);
 804         close(go_pipe[1]);
 805 out_close_ready_pipe:
 806         close(child_ready_pipe[0]);
 807         close(child_ready_pipe[1]);
 808         return -1;
 809 }
 810
 811 int perf_evlist__start_workload(struct perf_evlist *evlist)
 812 {
 813         if (evlist->workload.cork_fd > 0) {
 814                 /*
 815                  * Remove the cork, let it rip!
 816                  */
 817                 return close(evlist->workload.cork_fd);
 818         }
 819
 820         return 0;
 821 }
 822
 823 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
 824                               struct perf_sample *sample)
 825 {
 826         struct perf_evsel *evsel = perf_evlist__first(evlist);
 827         return perf_evsel__parse_sample(evsel, event, sample);
 828 }
 829
 830 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
 831 {
 832         struct perf_evsel *evsel;
 833         size_t printed = 0;
 834
 835         list_for_each_entry(evsel, &evlist->entries, node) {
 836                 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
 837                                    perf_evsel__name(evsel));
 838         }
 839
 840         return printed + fprintf(fp, "\n");;
 841 }