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(struct perf_evlist *evlist,
  53                         struct perf_record_opts *opts)
  54 {
  55         struct perf_evsel *evsel;
  56         /*
  57          * Set the evsel leader links before we configure attributes,
  58          * since some might depend on this info.
  59          */
  60         if (opts->group)
  61                 perf_evlist__set_leader(evlist);
  62
  63         if (evlist->cpus->map[0] < 0)
  64                 opts->no_inherit = true;
  65
  66         list_for_each_entry(evsel, &evlist->entries, node) {
  67                 perf_evsel__config(evsel, opts);
  68
  69                 if (evlist->nr_entries > 1)
  70                         perf_evsel__set_sample_id(evsel);
  71         }
  72 }
  73
  74 static void perf_evlist__purge(struct perf_evlist *evlist)
  75 {
  76         struct perf_evsel *pos, *n;
  77
  78         list_for_each_entry_safe(pos, n, &evlist->entries, node) {
  79                 list_del_init(&pos->node);
  80                 perf_evsel__delete(pos);
  81         }
  82
  83         evlist->nr_entries = 0;
  84 }
  85
  86 void perf_evlist__exit(struct perf_evlist *evlist)
  87 {
  88         free(evlist->mmap);
  89         free(evlist->pollfd);
  90         evlist->mmap = NULL;
  91         evlist->pollfd = NULL;
  92 }
  93
  94 void perf_evlist__delete(struct perf_evlist *evlist)
  95 {
  96         perf_evlist__purge(evlist);
  97         perf_evlist__exit(evlist);
  98         free(evlist);
  99 }
 100
 101 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
 102 {
 103         list_add_tail(&entry->node, &evlist->entries);
 104         ++evlist->nr_entries;
 105 }
 106
 107 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
 108                                    struct list_head *list,
 109                                    int nr_entries)
 110 {
 111         list_splice_tail(list, &evlist->entries);
 112         evlist->nr_entries += nr_entries;
 113 }
 114
 115 void __perf_evlist__set_leader(struct list_head *list)
 116 {
 117         struct perf_evsel *evsel, *leader;
 118
 119         leader = list_entry(list->next, struct perf_evsel, node);
 120
 121         list_for_each_entry(evsel, list, node) {
 122                 if (evsel != leader)
 123                         evsel->leader = leader;
 124         }
 125 }
 126
 127 void perf_evlist__set_leader(struct perf_evlist *evlist)
 128 {
 129         if (evlist->nr_entries)
 130                 __perf_evlist__set_leader(&evlist->entries);
 131 }
 132
 133 int perf_evlist__add_default(struct perf_evlist *evlist)
 134 {
 135         struct perf_event_attr attr = {
 136                 .type = PERF_TYPE_HARDWARE,
 137                 .config = PERF_COUNT_HW_CPU_CYCLES,
 138         };
 139         struct perf_evsel *evsel;
 140
 141         event_attr_init(&attr);
 142
 143         evsel = perf_evsel__new(&attr, 0);
 144         if (evsel == NULL)
 145                 goto error;
 146
 147         /* use strdup() because free(evsel) assumes name is allocated */
 148         evsel->name = strdup("cycles");
 149         if (!evsel->name)
 150                 goto error_free;
 151
 152         perf_evlist__add(evlist, evsel);
 153         return 0;
 154 error_free:
 155         perf_evsel__delete(evsel);
 156 error:
 157         return -ENOMEM;
 158 }
 159
 160 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
 161                                   struct perf_event_attr *attrs, size_t nr_attrs)
 162 {
 163         struct perf_evsel *evsel, *n;
 164         LIST_HEAD(head);
 165         size_t i;
 166
 167         for (i = 0; i < nr_attrs; i++) {
 168                 evsel = perf_evsel__new(attrs + i, evlist->nr_entries + i);
 169                 if (evsel == NULL)
 170                         goto out_delete_partial_list;
 171                 list_add_tail(&evsel->node, &head);
 172         }
 173
 174         perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
 175
 176         return 0;
 177
 178 out_delete_partial_list:
 179         list_for_each_entry_safe(evsel, n, &head, node)
 180                 perf_evsel__delete(evsel);
 181         return -1;
 182 }
 183
 184 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
 185                                      struct perf_event_attr *attrs, size_t nr_attrs)
 186 {
 187         size_t i;
 188
 189         for (i = 0; i < nr_attrs; i++)
 190                 event_attr_init(attrs + i);
 191
 192         return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
 193 }
 194
 195 struct perf_evsel *
 196 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
 197 {
 198         struct perf_evsel *evsel;
 199
 200         list_for_each_entry(evsel, &evlist->entries, node) {
 201                 if (evsel->attr.type   == PERF_TYPE_TRACEPOINT &&
 202                     (int)evsel->attr.config == id)
 203                         return evsel;
 204         }
 205
 206         return NULL;
 207 }
 208
 209 int perf_evlist__add_newtp(struct perf_evlist *evlist,
 210                            const char *sys, const char *name, void *handler)
 211 {
 212         struct perf_evsel *evsel;
 213
 214         evsel = perf_evsel__newtp(sys, name, evlist->nr_entries);
 215         if (evsel == NULL)
 216                 return -1;
 217
 218         evsel->handler.func = handler;
 219         perf_evlist__add(evlist, evsel);
 220         return 0;
 221 }
 222
 223 void perf_evlist__disable(struct perf_evlist *evlist)
 224 {
 225         int cpu, thread;
 226         struct perf_evsel *pos;
 227
 228         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 229                 list_for_each_entry(pos, &evlist->entries, node) {
 230                         if (!perf_evsel__is_group_leader(pos))
 231                                 continue;
 232                         for (thread = 0; thread < evlist->threads->nr; thread++)
 233                                 ioctl(FD(pos, cpu, thread),
 234                                       PERF_EVENT_IOC_DISABLE, 0);
 235                 }
 236         }
 237 }
 238
 239 void perf_evlist__enable(struct perf_evlist *evlist)
 240 {
 241         int cpu, thread;
 242         struct perf_evsel *pos;
 243
 244         for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
 245                 list_for_each_entry(pos, &evlist->entries, node) {
 246                         if (!perf_evsel__is_group_leader(pos))
 247                                 continue;
 248                         for (thread = 0; thread < evlist->threads->nr; thread++)
 249                                 ioctl(FD(pos, cpu, thread),
 250                                       PERF_EVENT_IOC_ENABLE, 0);
 251                 }
 252         }
 253 }
 254
 255 static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 256 {
 257         int nfds = cpu_map__nr(evlist->cpus) * evlist->threads->nr * evlist->nr_entries;
 258         evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
 259         return evlist->pollfd != NULL ? 0 : -ENOMEM;
 260 }
 261
 262 void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
 263 {
 264         fcntl(fd, F_SETFL, O_NONBLOCK);
 265         evlist->pollfd[evlist->nr_fds].fd = fd;
 266         evlist->pollfd[evlist->nr_fds].events = POLLIN;
 267         evlist->nr_fds++;
 268 }
 269
 270 static void perf_evlist__id_hash(struct perf_evlist *evlist,
 271                                  struct perf_evsel *evsel,
 272                                  int cpu, int thread, u64 id)
 273 {
 274         int hash;
 275         struct perf_sample_id *sid = SID(evsel, cpu, thread);
 276
 277         sid->id = id;
 278         sid->evsel = evsel;
 279         hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
 280         hlist_add_head(&sid->node, &evlist->heads[hash]);
 281 }
 282
 283 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
 284                          int cpu, int thread, u64 id)
 285 {
 286         perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
 287         evsel->id[evsel->ids++] = id;
 288 }
 289
 290 static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
 291                                   struct perf_evsel *evsel,
 292                                   int cpu, int thread, int fd)
 293 {
 294         u64 read_data[4] = { 0, };
 295         int id_idx = 1; /* The first entry is the counter value */
 296
 297         if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
 298             read(fd, &read_data, sizeof(read_data)) == -1)
 299                 return -1;
 300
 301         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 302                 ++id_idx;
 303         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 304                 ++id_idx;
 305
 306         perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]);
 307         return 0;
 308 }
 309
 310 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
 311 {
 312         struct hlist_head *head;
 313         struct hlist_node *pos;
 314         struct perf_sample_id *sid;
 315         int hash;
 316
 317         if (evlist->nr_entries == 1)
 318                 return perf_evlist__first(evlist);
 319
 320         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 321         head = &evlist->heads[hash];
 322
 323         hlist_for_each_entry(sid, pos, head, node)
 324                 if (sid->id == id)
 325                         return sid->evsel;
 326
 327         if (!perf_evlist__sample_id_all(evlist))
 328                 return perf_evlist__first(evlist);
 329
 330         return NULL;
 331 }
 332
 333 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 334 {
 335         struct perf_mmap *md = &evlist->mmap[idx];
 336         unsigned int head = perf_mmap__read_head(md);
 337         unsigned int old = md->prev;
 338         unsigned char *data = md->base + page_size;
 339         union perf_event *event = NULL;
 340
 341         if (evlist->overwrite) {
 342                 /*
 343                  * If we're further behind than half the buffer, there's a chance
 344                  * the writer will bite our tail and mess up the samples under us.
 345                  *
 346                  * If we somehow ended up ahead of the head, we got messed up.
 347                  *
 348                  * In either case, truncate and restart at head.
 349                  */
 350                 int diff = head - old;
 351                 if (diff > md->mask / 2 || diff < 0) {
 352                         fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
 353
 354                         /*
 355                          * head points to a known good entry, start there.
 356                          */
 357                         old = head;
 358                 }
 359         }
 360
 361         if (old != head) {
 362                 size_t size;
 363
 364                 event = (union perf_event *)&data[old & md->mask];
 365                 size = event->header.size;
 366
 367                 /*
 368                  * Event straddles the mmap boundary -- header should always
 369                  * be inside due to u64 alignment of output.
 370                  */
 371                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
 372                         unsigned int offset = old;
 373                         unsigned int len = min(sizeof(*event), size), cpy;
 374                         void *dst = &evlist->event_copy;
 375
 376                         do {
 377                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
 378                                 memcpy(dst, &data[offset & md->mask], cpy);
 379                                 offset += cpy;
 380                                 dst += cpy;
 381                                 len -= cpy;
 382                         } while (len);
 383
 384                         event = &evlist->event_copy;
 385                 }
 386
 387                 old += size;
 388         }
 389
 390         md->prev = old;
 391
 392         if (!evlist->overwrite)
 393                 perf_mmap__write_tail(md, old);
 394
 395         return event;
 396 }
 397
 398 void perf_evlist__munmap(struct perf_evlist *evlist)
 399 {
 400         int i;
 401
 402         for (i = 0; i < evlist->nr_mmaps; i++) {
 403                 if (evlist->mmap[i].base != NULL) {
 404                         munmap(evlist->mmap[i].base, evlist->mmap_len);
 405                         evlist->mmap[i].base = NULL;
 406                 }
 407         }
 408
 409         free(evlist->mmap);
 410         evlist->mmap = NULL;
 411 }
 412
 413 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
 414 {
 415         evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
 416         if (cpu_map__all(evlist->cpus))
 417                 evlist->nr_mmaps = evlist->threads->nr;
 418         evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
 419         return evlist->mmap != NULL ? 0 : -ENOMEM;
 420 }
 421
 422 static int __perf_evlist__mmap(struct perf_evlist *evlist,
 423                                int idx, int prot, int mask, int fd)
 424 {
 425         evlist->mmap[idx].prev = 0;
 426         evlist->mmap[idx].mask = mask;
 427         evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
 428                                       MAP_SHARED, fd, 0);
 429         if (evlist->mmap[idx].base == MAP_FAILED) {
 430                 evlist->mmap[idx].base = NULL;
 431                 return -1;
 432         }
 433
 434         perf_evlist__add_pollfd(evlist, fd);
 435         return 0;
 436 }
 437
 438 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
 439 {
 440         struct perf_evsel *evsel;
 441         int cpu, thread;
 442
 443         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 444                 int output = -1;
 445
 446                 for (thread = 0; thread < evlist->threads->nr; thread++) {
 447                         list_for_each_entry(evsel, &evlist->entries, node) {
 448                                 int fd = FD(evsel, cpu, thread);
 449
 450                                 if (output == -1) {
 451                                         output = fd;
 452                                         if (__perf_evlist__mmap(evlist, cpu,
 453                                                                 prot, mask, output) < 0)
 454                                                 goto out_unmap;
 455                                 } else {
 456                                         if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 457                                                 goto out_unmap;
 458                                 }
 459
 460                                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 461                                     perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
 462                                         goto out_unmap;
 463                         }
 464                 }
 465         }
 466
 467         return 0;
 468
 469 out_unmap:
 470         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 471                 if (evlist->mmap[cpu].base != NULL) {
 472                         munmap(evlist->mmap[cpu].base, evlist->mmap_len);
 473                         evlist->mmap[cpu].base = NULL;
 474                 }
 475         }
 476         return -1;
 477 }
 478
 479 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
 480 {
 481         struct perf_evsel *evsel;
 482         int thread;
 483
 484         for (thread = 0; thread < evlist->threads->nr; thread++) {
 485                 int output = -1;
 486
 487                 list_for_each_entry(evsel, &evlist->entries, node) {
 488                         int fd = FD(evsel, 0, thread);
 489
 490                         if (output == -1) {
 491                                 output = fd;
 492                                 if (__perf_evlist__mmap(evlist, thread,
 493                                                         prot, mask, output) < 0)
 494                                         goto out_unmap;
 495                         } else {
 496                                 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 497                                         goto out_unmap;
 498                         }
 499
 500                         if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 501                             perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
 502                                 goto out_unmap;
 503                 }
 504         }
 505
 506         return 0;
 507
 508 out_unmap:
 509         for (thread = 0; thread < evlist->threads->nr; thread++) {
 510                 if (evlist->mmap[thread].base != NULL) {
 511                         munmap(evlist->mmap[thread].base, evlist->mmap_len);
 512                         evlist->mmap[thread].base = NULL;
 513                 }
 514         }
 515         return -1;
 516 }
 517
 518 /** perf_evlist__mmap - Create per cpu maps to receive events
 519  *
 520  * @evlist - list of events
 521  * @pages - map length in pages
 522  * @overwrite - overwrite older events?
 523  *
 524  * If overwrite is false the user needs to signal event consuption using:
 525  *
 526  *      struct perf_mmap *m = &evlist->mmap[cpu];
 527  *      unsigned int head = perf_mmap__read_head(m);
 528  *
 529  *      perf_mmap__write_tail(m, head)
 530  *
 531  * Using perf_evlist__read_on_cpu does this automatically.
 532  */
 533 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
 534                       bool overwrite)
 535 {
 536         struct perf_evsel *evsel;
 537         const struct cpu_map *cpus = evlist->cpus;
 538         const struct thread_map *threads = evlist->threads;
 539         int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
 540
 541         /* 512 kiB: default amount of unprivileged mlocked memory */
 542         if (pages == UINT_MAX)
 543                 pages = (512 * 1024) / page_size;
 544         else if (!is_power_of_2(pages))
 545                 return -EINVAL;
 546
 547         mask = pages * page_size - 1;
 548
 549         if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
 550                 return -ENOMEM;
 551
 552         if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
 553                 return -ENOMEM;
 554
 555         evlist->overwrite = overwrite;
 556         evlist->mmap_len = (pages + 1) * page_size;
 557
 558         list_for_each_entry(evsel, &evlist->entries, node) {
 559                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 560                     evsel->sample_id == NULL &&
 561                     perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
 562                         return -ENOMEM;
 563         }
 564
 565         if (cpu_map__all(cpus))
 566                 return perf_evlist__mmap_per_thread(evlist, prot, mask);
 567
 568         return perf_evlist__mmap_per_cpu(evlist, prot, mask);
 569 }
 570
 571 int perf_evlist__create_maps(struct perf_evlist *evlist,
 572                              struct perf_target *target)
 573 {
 574         evlist->threads = thread_map__new_str(target->pid, target->tid,
 575                                               target->uid);
 576
 577         if (evlist->threads == NULL)
 578                 return -1;
 579
 580         if (perf_target__has_task(target))
 581                 evlist->cpus = cpu_map__dummy_new();
 582         else if (!perf_target__has_cpu(target) && !target->uses_mmap)
 583                 evlist->cpus = cpu_map__dummy_new();
 584         else
 585                 evlist->cpus = cpu_map__new(target->cpu_list);
 586
 587         if (evlist->cpus == NULL)
 588                 goto out_delete_threads;
 589
 590         return 0;
 591
 592 out_delete_threads:
 593         thread_map__delete(evlist->threads);
 594         return -1;
 595 }
 596
 597 void perf_evlist__delete_maps(struct perf_evlist *evlist)
 598 {
 599         cpu_map__delete(evlist->cpus);
 600         thread_map__delete(evlist->threads);
 601         evlist->cpus    = NULL;
 602         evlist->threads = NULL;
 603 }
 604
 605 int perf_evlist__apply_filters(struct perf_evlist *evlist)
 606 {
 607         struct perf_evsel *evsel;
 608         int err = 0;
 609         const int ncpus = cpu_map__nr(evlist->cpus),
 610                   nthreads = evlist->threads->nr;
 611
 612         list_for_each_entry(evsel, &evlist->entries, node) {
 613                 if (evsel->filter == NULL)
 614                         continue;
 615
 616                 err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
 617                 if (err)
 618                         break;
 619         }
 620
 621         return err;
 622 }
 623
 624 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
 625 {
 626         struct perf_evsel *evsel;
 627         int err = 0;
 628         const int ncpus = cpu_map__nr(evlist->cpus),
 629                   nthreads = evlist->threads->nr;
 630
 631         list_for_each_entry(evsel, &evlist->entries, node) {
 632                 err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
 633                 if (err)
 634                         break;
 635         }
 636
 637         return err;
 638 }
 639
 640 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
 641 {
 642         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 643
 644         list_for_each_entry_continue(pos, &evlist->entries, node) {
 645                 if (first->attr.sample_type != pos->attr.sample_type)
 646                         return false;
 647         }
 648
 649         return true;
 650 }
 651
 652 u64 perf_evlist__sample_type(struct perf_evlist *evlist)
 653 {
 654         struct perf_evsel *first = perf_evlist__first(evlist);
 655         return first->attr.sample_type;
 656 }
 657
 658 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
 659 {
 660         struct perf_evsel *first = perf_evlist__first(evlist);
 661         struct perf_sample *data;
 662         u64 sample_type;
 663         u16 size = 0;
 664
 665         if (!first->attr.sample_id_all)
 666                 goto out;
 667
 668         sample_type = first->attr.sample_type;
 669
 670         if (sample_type & PERF_SAMPLE_TID)
 671                 size += sizeof(data->tid) * 2;
 672
 673        if (sample_type & PERF_SAMPLE_TIME)
 674                 size += sizeof(data->time);
 675
 676         if (sample_type & PERF_SAMPLE_ID)
 677                 size += sizeof(data->id);
 678
 679         if (sample_type & PERF_SAMPLE_STREAM_ID)
 680                 size += sizeof(data->stream_id);
 681
 682         if (sample_type & PERF_SAMPLE_CPU)
 683                 size += sizeof(data->cpu) * 2;
 684 out:
 685         return size;
 686 }
 687
 688 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
 689 {
 690         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 691
 692         list_for_each_entry_continue(pos, &evlist->entries, node) {
 693                 if (first->attr.sample_id_all != pos->attr.sample_id_all)
 694                         return false;
 695         }
 696
 697         return true;
 698 }
 699
 700 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
 701 {
 702         struct perf_evsel *first = perf_evlist__first(evlist);
 703         return first->attr.sample_id_all;
 704 }
 705
 706 void perf_evlist__set_selected(struct perf_evlist *evlist,
 707                                struct perf_evsel *evsel)
 708 {
 709         evlist->selected = evsel;
 710 }
 711
 712 int perf_evlist__open(struct perf_evlist *evlist)
 713 {
 714         struct perf_evsel *evsel;
 715         int err, ncpus, nthreads;
 716
 717         list_for_each_entry(evsel, &evlist->entries, node) {
 718                 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
 719                 if (err < 0)
 720                         goto out_err;
 721         }
 722
 723         return 0;
 724 out_err:
 725         ncpus = evlist->cpus ? evlist->cpus->nr : 1;
 726         nthreads = evlist->threads ? evlist->threads->nr : 1;
 727
 728         list_for_each_entry_reverse(evsel, &evlist->entries, node)
 729                 perf_evsel__close(evsel, ncpus, nthreads);
 730
 731         errno = -err;
 732         return err;
 733 }
 734
 735 int perf_evlist__prepare_workload(struct perf_evlist *evlist,
 736                                   struct perf_record_opts *opts,
 737                                   const char *argv[])
 738 {
 739         int child_ready_pipe[2], go_pipe[2];
 740         char bf;
 741
 742         if (pipe(child_ready_pipe) < 0) {
 743                 perror("failed to create 'ready' pipe");
 744                 return -1;
 745         }
 746
 747         if (pipe(go_pipe) < 0) {
 748                 perror("failed to create 'go' pipe");
 749                 goto out_close_ready_pipe;
 750         }
 751
 752         evlist->workload.pid = fork();
 753         if (evlist->workload.pid < 0) {
 754                 perror("failed to fork");
 755                 goto out_close_pipes;
 756         }
 757
 758         if (!evlist->workload.pid) {
 759                 if (opts->pipe_output)
 760                         dup2(2, 1);
 761
 762                 close(child_ready_pipe[0]);
 763                 close(go_pipe[1]);
 764                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 765
 766                 /*
 767                  * Do a dummy execvp to get the PLT entry resolved,
 768                  * so we avoid the resolver overhead on the real
 769                  * execvp call.
 770                  */
 771                 execvp("", (char **)argv);
 772
 773                 /*
 774                  * Tell the parent we're ready to go
 775                  */
 776                 close(child_ready_pipe[1]);
 777
 778                 /*
 779                  * Wait until the parent tells us to go.
 780                  */
 781                 if (read(go_pipe[0], &bf, 1) == -1)
 782                         perror("unable to read pipe");
 783
 784                 execvp(argv[0], (char **)argv);
 785
 786                 perror(argv[0]);
 787                 kill(getppid(), SIGUSR1);
 788                 exit(-1);
 789         }
 790
 791         if (perf_target__none(&opts->target))
 792                 evlist->threads->map[0] = evlist->workload.pid;
 793
 794         close(child_ready_pipe[1]);
 795         close(go_pipe[0]);
 796         /*
 797          * wait for child to settle
 798          */
 799         if (read(child_ready_pipe[0], &bf, 1) == -1) {
 800                 perror("unable to read pipe");
 801                 goto out_close_pipes;
 802         }
 803
 804         evlist->workload.cork_fd = go_pipe[1];
 805         close(child_ready_pipe[0]);
 806         return 0;
 807
 808 out_close_pipes:
 809         close(go_pipe[0]);
 810         close(go_pipe[1]);
 811 out_close_ready_pipe:
 812         close(child_ready_pipe[0]);
 813         close(child_ready_pipe[1]);
 814         return -1;
 815 }
 816
 817 int perf_evlist__start_workload(struct perf_evlist *evlist)
 818 {
 819         if (evlist->workload.cork_fd > 0) {
 820                 /*
 821                  * Remove the cork, let it rip!
 822                  */
 823                 return close(evlist->workload.cork_fd);
 824         }
 825
 826         return 0;
 827 }
 828
 829 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
 830                               struct perf_sample *sample)
 831 {
 832         struct perf_evsel *evsel = perf_evlist__first(evlist);
 833         return perf_evsel__parse_sample(evsel, event, sample);
 834 }
 835
 836 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
 837 {
 838         struct perf_evsel *evsel;
 839         size_t printed = 0;
 840
 841         list_for_each_entry(evsel, &evlist->entries, node) {
 842                 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
 843                                    perf_evsel__name(evsel));
 844         }
 845
 846         return printed + fprintf(fp, "\n");;
 847 }