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         evsel = list_entry(list->prev, struct perf_evsel, node);
 121
 122         leader->nr_members = evsel->idx - leader->idx + 1;
 123
 124         list_for_each_entry(evsel, list, node) {
 125                 evsel->leader = leader;
 126         }
 127 }
 128
 129 void perf_evlist__set_leader(struct perf_evlist *evlist)
 130 {
 131         if (evlist->nr_entries) {
 132                 evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
 133                 __perf_evlist__set_leader(&evlist->entries);
 134         }
 135 }
 136
 137 int perf_evlist__add_default(struct perf_evlist *evlist)
 138 {
 139         struct perf_event_attr attr = {
 140                 .type = PERF_TYPE_HARDWARE,
 141                 .config = PERF_COUNT_HW_CPU_CYCLES,
 142         };
 143         struct perf_evsel *evsel;
 144
 145         event_attr_init(&attr);
 146
 147         evsel = perf_evsel__new(&attr, 0);
 148         if (evsel == NULL)
 149                 goto error;
 150
 151         /* use strdup() because free(evsel) assumes name is allocated */
 152         evsel->name = strdup("cycles");
 153         if (!evsel->name)
 154                 goto error_free;
 155
 156         perf_evlist__add(evlist, evsel);
 157         return 0;
 158 error_free:
 159         perf_evsel__delete(evsel);
 160 error:
 161         return -ENOMEM;
 162 }
 163
 164 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
 165                                   struct perf_event_attr *attrs, size_t nr_attrs)
 166 {
 167         struct perf_evsel *evsel, *n;
 168         LIST_HEAD(head);
 169         size_t i;
 170
 171         for (i = 0; i < nr_attrs; i++) {
 172                 evsel = perf_evsel__new(attrs + i, evlist->nr_entries + i);
 173                 if (evsel == NULL)
 174                         goto out_delete_partial_list;
 175                 list_add_tail(&evsel->node, &head);
 176         }
 177
 178         perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
 179
 180         return 0;
 181
 182 out_delete_partial_list:
 183         list_for_each_entry_safe(evsel, n, &head, node)
 184                 perf_evsel__delete(evsel);
 185         return -1;
 186 }
 187
 188 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
 189                                      struct perf_event_attr *attrs, size_t nr_attrs)
 190 {
 191         size_t i;
 192
 193         for (i = 0; i < nr_attrs; i++)
 194                 event_attr_init(attrs + i);
 195
 196         return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
 197 }
 198
 199 struct perf_evsel *
 200 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
 201 {
 202         struct perf_evsel *evsel;
 203
 204         list_for_each_entry(evsel, &evlist->entries, node) {
 205                 if (evsel->attr.type   == PERF_TYPE_TRACEPOINT &&
 206                     (int)evsel->attr.config == id)
 207                         return evsel;
 208         }
 209
 210         return NULL;
 211 }
 212
 213 int perf_evlist__add_newtp(struct perf_evlist *evlist,
 214                            const char *sys, const char *name, void *handler)
 215 {
 216         struct perf_evsel *evsel;
 217
 218         evsel = perf_evsel__newtp(sys, name, evlist->nr_entries);
 219         if (evsel == NULL)
 220                 return -1;
 221
 222         evsel->handler.func = handler;
 223         perf_evlist__add(evlist, evsel);
 224         return 0;
 225 }
 226
 227 void perf_evlist__disable(struct perf_evlist *evlist)
 228 {
 229         int cpu, thread;
 230         struct perf_evsel *pos;
 231
 232         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 233                 list_for_each_entry(pos, &evlist->entries, node) {
 234                         if (!perf_evsel__is_group_leader(pos))
 235                                 continue;
 236                         for (thread = 0; thread < evlist->threads->nr; thread++)
 237                                 ioctl(FD(pos, cpu, thread),
 238                                       PERF_EVENT_IOC_DISABLE, 0);
 239                 }
 240         }
 241 }
 242
 243 void perf_evlist__enable(struct perf_evlist *evlist)
 244 {
 245         int cpu, thread;
 246         struct perf_evsel *pos;
 247
 248         for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
 249                 list_for_each_entry(pos, &evlist->entries, node) {
 250                         if (!perf_evsel__is_group_leader(pos))
 251                                 continue;
 252                         for (thread = 0; thread < evlist->threads->nr; thread++)
 253                                 ioctl(FD(pos, cpu, thread),
 254                                       PERF_EVENT_IOC_ENABLE, 0);
 255                 }
 256         }
 257 }
 258
 259 static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 260 {
 261         int nfds = cpu_map__nr(evlist->cpus) * evlist->threads->nr * evlist->nr_entries;
 262         evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
 263         return evlist->pollfd != NULL ? 0 : -ENOMEM;
 264 }
 265
 266 void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
 267 {
 268         fcntl(fd, F_SETFL, O_NONBLOCK);
 269         evlist->pollfd[evlist->nr_fds].fd = fd;
 270         evlist->pollfd[evlist->nr_fds].events = POLLIN;
 271         evlist->nr_fds++;
 272 }
 273
 274 static void perf_evlist__id_hash(struct perf_evlist *evlist,
 275                                  struct perf_evsel *evsel,
 276                                  int cpu, int thread, u64 id)
 277 {
 278         int hash;
 279         struct perf_sample_id *sid = SID(evsel, cpu, thread);
 280
 281         sid->id = id;
 282         sid->evsel = evsel;
 283         hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
 284         hlist_add_head(&sid->node, &evlist->heads[hash]);
 285 }
 286
 287 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
 288                          int cpu, int thread, u64 id)
 289 {
 290         perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
 291         evsel->id[evsel->ids++] = id;
 292 }
 293
 294 static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
 295                                   struct perf_evsel *evsel,
 296                                   int cpu, int thread, int fd)
 297 {
 298         u64 read_data[4] = { 0, };
 299         int id_idx = 1; /* The first entry is the counter value */
 300
 301         if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
 302             read(fd, &read_data, sizeof(read_data)) == -1)
 303                 return -1;
 304
 305         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 306                 ++id_idx;
 307         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 308                 ++id_idx;
 309
 310         perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]);
 311         return 0;
 312 }
 313
 314 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
 315 {
 316         struct hlist_head *head;
 317         struct perf_sample_id *sid;
 318         int hash;
 319
 320         if (evlist->nr_entries == 1)
 321                 return perf_evlist__first(evlist);
 322
 323         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 324         head = &evlist->heads[hash];
 325
 326         hlist_for_each_entry(sid, head, node)
 327                 if (sid->id == id)
 328                         return sid->evsel;
 329
 330         if (!perf_evlist__sample_id_all(evlist))
 331                 return perf_evlist__first(evlist);
 332
 333         return NULL;
 334 }
 335
 336 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 337 {
 338         struct perf_mmap *md = &evlist->mmap[idx];
 339         unsigned int head = perf_mmap__read_head(md);
 340         unsigned int old = md->prev;
 341         unsigned char *data = md->base + page_size;
 342         union perf_event *event = NULL;
 343
 344         if (evlist->overwrite) {
 345                 /*
 346                  * If we're further behind than half the buffer, there's a chance
 347                  * the writer will bite our tail and mess up the samples under us.
 348                  *
 349                  * If we somehow ended up ahead of the head, we got messed up.
 350                  *
 351                  * In either case, truncate and restart at head.
 352                  */
 353                 int diff = head - old;
 354                 if (diff > md->mask / 2 || diff < 0) {
 355                         fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
 356
 357                         /*
 358                          * head points to a known good entry, start there.
 359                          */
 360                         old = head;
 361                 }
 362         }
 363
 364         if (old != head) {
 365                 size_t size;
 366
 367                 event = (union perf_event *)&data[old & md->mask];
 368                 size = event->header.size;
 369
 370                 /*
 371                  * Event straddles the mmap boundary -- header should always
 372                  * be inside due to u64 alignment of output.
 373                  */
 374                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
 375                         unsigned int offset = old;
 376                         unsigned int len = min(sizeof(*event), size), cpy;
 377                         void *dst = &md->event_copy;
 378
 379                         do {
 380                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
 381                                 memcpy(dst, &data[offset & md->mask], cpy);
 382                                 offset += cpy;
 383                                 dst += cpy;
 384                                 len -= cpy;
 385                         } while (len);
 386
 387                         event = &md->event_copy;
 388                 }
 389
 390                 old += size;
 391         }
 392
 393         md->prev = old;
 394
 395         if (!evlist->overwrite)
 396                 perf_mmap__write_tail(md, old);
 397
 398         return event;
 399 }
 400
 401 void perf_evlist__munmap(struct perf_evlist *evlist)
 402 {
 403         int i;
 404
 405         for (i = 0; i < evlist->nr_mmaps; i++) {
 406                 if (evlist->mmap[i].base != NULL) {
 407                         munmap(evlist->mmap[i].base, evlist->mmap_len);
 408                         evlist->mmap[i].base = NULL;
 409                 }
 410         }
 411
 412         free(evlist->mmap);
 413         evlist->mmap = NULL;
 414 }
 415
 416 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
 417 {
 418         evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
 419         if (cpu_map__all(evlist->cpus))
 420                 evlist->nr_mmaps = evlist->threads->nr;
 421         evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
 422         return evlist->mmap != NULL ? 0 : -ENOMEM;
 423 }
 424
 425 static int __perf_evlist__mmap(struct perf_evlist *evlist,
 426                                int idx, int prot, int mask, int fd)
 427 {
 428         evlist->mmap[idx].prev = 0;
 429         evlist->mmap[idx].mask = mask;
 430         evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
 431                                       MAP_SHARED, fd, 0);
 432         if (evlist->mmap[idx].base == MAP_FAILED) {
 433                 evlist->mmap[idx].base = NULL;
 434                 return -1;
 435         }
 436
 437         perf_evlist__add_pollfd(evlist, fd);
 438         return 0;
 439 }
 440
 441 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
 442 {
 443         struct perf_evsel *evsel;
 444         int cpu, thread;
 445
 446         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 447                 int output = -1;
 448
 449                 for (thread = 0; thread < evlist->threads->nr; thread++) {
 450                         list_for_each_entry(evsel, &evlist->entries, node) {
 451                                 int fd = FD(evsel, cpu, thread);
 452
 453                                 if (output == -1) {
 454                                         output = fd;
 455                                         if (__perf_evlist__mmap(evlist, cpu,
 456                                                                 prot, mask, output) < 0)
 457                                                 goto out_unmap;
 458                                 } else {
 459                                         if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 460                                                 goto out_unmap;
 461                                 }
 462
 463                                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 464                                     perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
 465                                         goto out_unmap;
 466                         }
 467                 }
 468         }
 469
 470         return 0;
 471
 472 out_unmap:
 473         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 474                 if (evlist->mmap[cpu].base != NULL) {
 475                         munmap(evlist->mmap[cpu].base, evlist->mmap_len);
 476                         evlist->mmap[cpu].base = NULL;
 477                 }
 478         }
 479         return -1;
 480 }
 481
 482 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
 483 {
 484         struct perf_evsel *evsel;
 485         int thread;
 486
 487         for (thread = 0; thread < evlist->threads->nr; thread++) {
 488                 int output = -1;
 489
 490                 list_for_each_entry(evsel, &evlist->entries, node) {
 491                         int fd = FD(evsel, 0, thread);
 492
 493                         if (output == -1) {
 494                                 output = fd;
 495                                 if (__perf_evlist__mmap(evlist, thread,
 496                                                         prot, mask, output) < 0)
 497                                         goto out_unmap;
 498                         } else {
 499                                 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 500                                         goto out_unmap;
 501                         }
 502
 503                         if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 504                             perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
 505                                 goto out_unmap;
 506                 }
 507         }
 508
 509         return 0;
 510
 511 out_unmap:
 512         for (thread = 0; thread < evlist->threads->nr; thread++) {
 513                 if (evlist->mmap[thread].base != NULL) {
 514                         munmap(evlist->mmap[thread].base, evlist->mmap_len);
 515                         evlist->mmap[thread].base = NULL;
 516                 }
 517         }
 518         return -1;
 519 }
 520
 521 /** perf_evlist__mmap - Create per cpu maps to receive events
 522  *
 523  * @evlist - list of events
 524  * @pages - map length in pages
 525  * @overwrite - overwrite older events?
 526  *
 527  * If overwrite is false the user needs to signal event consuption using:
 528  *
 529  *      struct perf_mmap *m = &evlist->mmap[cpu];
 530  *      unsigned int head = perf_mmap__read_head(m);
 531  *
 532  *      perf_mmap__write_tail(m, head)
 533  *
 534  * Using perf_evlist__read_on_cpu does this automatically.
 535  */
 536 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
 537                       bool overwrite)
 538 {
 539         struct perf_evsel *evsel;
 540         const struct cpu_map *cpus = evlist->cpus;
 541         const struct thread_map *threads = evlist->threads;
 542         int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
 543
 544         /* 512 kiB: default amount of unprivileged mlocked memory */
 545         if (pages == UINT_MAX)
 546                 pages = (512 * 1024) / page_size;
 547         else if (!is_power_of_2(pages))
 548                 return -EINVAL;
 549
 550         mask = pages * page_size - 1;
 551
 552         if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
 553                 return -ENOMEM;
 554
 555         if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
 556                 return -ENOMEM;
 557
 558         evlist->overwrite = overwrite;
 559         evlist->mmap_len = (pages + 1) * page_size;
 560
 561         list_for_each_entry(evsel, &evlist->entries, node) {
 562                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 563                     evsel->sample_id == NULL &&
 564                     perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
 565                         return -ENOMEM;
 566         }
 567
 568         if (cpu_map__all(cpus))
 569                 return perf_evlist__mmap_per_thread(evlist, prot, mask);
 570
 571         return perf_evlist__mmap_per_cpu(evlist, prot, mask);
 572 }
 573
 574 int perf_evlist__create_maps(struct perf_evlist *evlist,
 575                              struct perf_target *target)
 576 {
 577         evlist->threads = thread_map__new_str(target->pid, target->tid,
 578                                               target->uid);
 579
 580         if (evlist->threads == NULL)
 581                 return -1;
 582
 583         if (perf_target__has_task(target))
 584                 evlist->cpus = cpu_map__dummy_new();
 585         else if (!perf_target__has_cpu(target) && !target->uses_mmap)
 586                 evlist->cpus = cpu_map__dummy_new();
 587         else
 588                 evlist->cpus = cpu_map__new(target->cpu_list);
 589
 590         if (evlist->cpus == NULL)
 591                 goto out_delete_threads;
 592
 593         return 0;
 594
 595 out_delete_threads:
 596         thread_map__delete(evlist->threads);
 597         return -1;
 598 }
 599
 600 void perf_evlist__delete_maps(struct perf_evlist *evlist)
 601 {
 602         cpu_map__delete(evlist->cpus);
 603         thread_map__delete(evlist->threads);
 604         evlist->cpus    = NULL;
 605         evlist->threads = NULL;
 606 }
 607
 608 int perf_evlist__apply_filters(struct perf_evlist *evlist)
 609 {
 610         struct perf_evsel *evsel;
 611         int err = 0;
 612         const int ncpus = cpu_map__nr(evlist->cpus),
 613                   nthreads = evlist->threads->nr;
 614
 615         list_for_each_entry(evsel, &evlist->entries, node) {
 616                 if (evsel->filter == NULL)
 617                         continue;
 618
 619                 err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
 620                 if (err)
 621                         break;
 622         }
 623
 624         return err;
 625 }
 626
 627 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
 628 {
 629         struct perf_evsel *evsel;
 630         int err = 0;
 631         const int ncpus = cpu_map__nr(evlist->cpus),
 632                   nthreads = evlist->threads->nr;
 633
 634         list_for_each_entry(evsel, &evlist->entries, node) {
 635                 err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
 636                 if (err)
 637                         break;
 638         }
 639
 640         return err;
 641 }
 642
 643 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
 644 {
 645         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 646
 647         list_for_each_entry_continue(pos, &evlist->entries, node) {
 648                 if (first->attr.sample_type != pos->attr.sample_type)
 649                         return false;
 650         }
 651
 652         return true;
 653 }
 654
 655 u64 perf_evlist__sample_type(struct perf_evlist *evlist)
 656 {
 657         struct perf_evsel *first = perf_evlist__first(evlist);
 658         return first->attr.sample_type;
 659 }
 660
 661 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
 662 {
 663         struct perf_evsel *first = perf_evlist__first(evlist);
 664         struct perf_sample *data;
 665         u64 sample_type;
 666         u16 size = 0;
 667
 668         if (!first->attr.sample_id_all)
 669                 goto out;
 670
 671         sample_type = first->attr.sample_type;
 672
 673         if (sample_type & PERF_SAMPLE_TID)
 674                 size += sizeof(data->tid) * 2;
 675
 676        if (sample_type & PERF_SAMPLE_TIME)
 677                 size += sizeof(data->time);
 678
 679         if (sample_type & PERF_SAMPLE_ID)
 680                 size += sizeof(data->id);
 681
 682         if (sample_type & PERF_SAMPLE_STREAM_ID)
 683                 size += sizeof(data->stream_id);
 684
 685         if (sample_type & PERF_SAMPLE_CPU)
 686                 size += sizeof(data->cpu) * 2;
 687 out:
 688         return size;
 689 }
 690
 691 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
 692 {
 693         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 694
 695         list_for_each_entry_continue(pos, &evlist->entries, node) {
 696                 if (first->attr.sample_id_all != pos->attr.sample_id_all)
 697                         return false;
 698         }
 699
 700         return true;
 701 }
 702
 703 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
 704 {
 705         struct perf_evsel *first = perf_evlist__first(evlist);
 706         return first->attr.sample_id_all;
 707 }
 708
 709 void perf_evlist__set_selected(struct perf_evlist *evlist,
 710                                struct perf_evsel *evsel)
 711 {
 712         evlist->selected = evsel;
 713 }
 714
 715 int perf_evlist__open(struct perf_evlist *evlist)
 716 {
 717         struct perf_evsel *evsel;
 718         int err, ncpus, nthreads;
 719
 720         list_for_each_entry(evsel, &evlist->entries, node) {
 721                 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
 722                 if (err < 0)
 723                         goto out_err;
 724         }
 725
 726         return 0;
 727 out_err:
 728         ncpus = evlist->cpus ? evlist->cpus->nr : 1;
 729         nthreads = evlist->threads ? evlist->threads->nr : 1;
 730
 731         list_for_each_entry_reverse(evsel, &evlist->entries, node)
 732                 perf_evsel__close(evsel, ncpus, nthreads);
 733
 734         errno = -err;
 735         return err;
 736 }
 737
 738 int perf_evlist__prepare_workload(struct perf_evlist *evlist,
 739                                   struct perf_record_opts *opts,
 740                                   const char *argv[])
 741 {
 742         int child_ready_pipe[2], go_pipe[2];
 743         char bf;
 744
 745         if (pipe(child_ready_pipe) < 0) {
 746                 perror("failed to create 'ready' pipe");
 747                 return -1;
 748         }
 749
 750         if (pipe(go_pipe) < 0) {
 751                 perror("failed to create 'go' pipe");
 752                 goto out_close_ready_pipe;
 753         }
 754
 755         evlist->workload.pid = fork();
 756         if (evlist->workload.pid < 0) {
 757                 perror("failed to fork");
 758                 goto out_close_pipes;
 759         }
 760
 761         if (!evlist->workload.pid) {
 762                 if (opts->pipe_output)
 763                         dup2(2, 1);
 764
 765                 close(child_ready_pipe[0]);
 766                 close(go_pipe[1]);
 767                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 768
 769                 /*
 770                  * Do a dummy execvp to get the PLT entry resolved,
 771                  * so we avoid the resolver overhead on the real
 772                  * execvp call.
 773                  */
 774                 execvp("", (char **)argv);
 775
 776                 /*
 777                  * Tell the parent we're ready to go
 778                  */
 779                 close(child_ready_pipe[1]);
 780
 781                 /*
 782                  * Wait until the parent tells us to go.
 783                  */
 784                 if (read(go_pipe[0], &bf, 1) == -1)
 785                         perror("unable to read pipe");
 786
 787                 execvp(argv[0], (char **)argv);
 788
 789                 perror(argv[0]);
 790                 kill(getppid(), SIGUSR1);
 791                 exit(-1);
 792         }
 793
 794         if (perf_target__none(&opts->target))
 795                 evlist->threads->map[0] = evlist->workload.pid;
 796
 797         close(child_ready_pipe[1]);
 798         close(go_pipe[0]);
 799         /*
 800          * wait for child to settle
 801          */
 802         if (read(child_ready_pipe[0], &bf, 1) == -1) {
 803                 perror("unable to read pipe");
 804                 goto out_close_pipes;
 805         }
 806
 807         evlist->workload.cork_fd = go_pipe[1];
 808         close(child_ready_pipe[0]);
 809         return 0;
 810
 811 out_close_pipes:
 812         close(go_pipe[0]);
 813         close(go_pipe[1]);
 814 out_close_ready_pipe:
 815         close(child_ready_pipe[0]);
 816         close(child_ready_pipe[1]);
 817         return -1;
 818 }
 819
 820 int perf_evlist__start_workload(struct perf_evlist *evlist)
 821 {
 822         if (evlist->workload.cork_fd > 0) {
 823                 /*
 824                  * Remove the cork, let it rip!
 825                  */
 826                 return close(evlist->workload.cork_fd);
 827         }
 828
 829         return 0;
 830 }
 831
 832 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
 833                               struct perf_sample *sample)
 834 {
 835         struct perf_evsel *evsel = perf_evlist__first(evlist);
 836         return perf_evsel__parse_sample(evsel, event, sample);
 837 }
 838
 839 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
 840 {
 841         struct perf_evsel *evsel;
 842         size_t printed = 0;
 843
 844         list_for_each_entry(evsel, &evlist->entries, node) {
 845                 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
 846                                    perf_evsel__name(evsel));
 847         }
 848
 849         return printed + fprintf(fp, "\n");;
 850 }