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 hlist_node *pos;
 318         struct perf_sample_id *sid;
 319         int hash;
 320
 321         if (evlist->nr_entries == 1)
 322                 return perf_evlist__first(evlist);
 323
 324         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 325         head = &evlist->heads[hash];
 326
 327         hlist_for_each_entry(sid, pos, head, node)
 328                 if (sid->id == id)
 329                         return sid->evsel;
 330
 331         if (!perf_evlist__sample_id_all(evlist))
 332                 return perf_evlist__first(evlist);
 333
 334         return NULL;
 335 }
 336
 337 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 338 {
 339         struct perf_mmap *md = &evlist->mmap[idx];
 340         unsigned int head = perf_mmap__read_head(md);
 341         unsigned int old = md->prev;
 342         unsigned char *data = md->base + page_size;
 343         union perf_event *event = NULL;
 344
 345         if (evlist->overwrite) {
 346                 /*
 347                  * If we're further behind than half the buffer, there's a chance
 348                  * the writer will bite our tail and mess up the samples under us.
 349                  *
 350                  * If we somehow ended up ahead of the head, we got messed up.
 351                  *
 352                  * In either case, truncate and restart at head.
 353                  */
 354                 int diff = head - old;
 355                 if (diff > md->mask / 2 || diff < 0) {
 356                         fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
 357
 358                         /*
 359                          * head points to a known good entry, start there.
 360                          */
 361                         old = head;
 362                 }
 363         }
 364
 365         if (old != head) {
 366                 size_t size;
 367
 368                 event = (union perf_event *)&data[old & md->mask];
 369                 size = event->header.size;
 370
 371                 /*
 372                  * Event straddles the mmap boundary -- header should always
 373                  * be inside due to u64 alignment of output.
 374                  */
 375                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
 376                         unsigned int offset = old;
 377                         unsigned int len = min(sizeof(*event), size), cpy;
 378                         void *dst = &md->event_copy;
 379
 380                         do {
 381                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
 382                                 memcpy(dst, &data[offset & md->mask], cpy);
 383                                 offset += cpy;
 384                                 dst += cpy;
 385                                 len -= cpy;
 386                         } while (len);
 387
 388                         event = &md->event_copy;
 389                 }
 390
 391                 old += size;
 392         }
 393
 394         md->prev = old;
 395
 396         if (!evlist->overwrite)
 397                 perf_mmap__write_tail(md, old);
 398
 399         return event;
 400 }
 401
 402 void perf_evlist__munmap(struct perf_evlist *evlist)
 403 {
 404         int i;
 405
 406         for (i = 0; i < evlist->nr_mmaps; i++) {
 407                 if (evlist->mmap[i].base != NULL) {
 408                         munmap(evlist->mmap[i].base, evlist->mmap_len);
 409                         evlist->mmap[i].base = NULL;
 410                 }
 411         }
 412
 413         free(evlist->mmap);
 414         evlist->mmap = NULL;
 415 }
 416
 417 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
 418 {
 419         evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
 420         if (cpu_map__all(evlist->cpus))
 421                 evlist->nr_mmaps = evlist->threads->nr;
 422         evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
 423         return evlist->mmap != NULL ? 0 : -ENOMEM;
 424 }
 425
 426 static int __perf_evlist__mmap(struct perf_evlist *evlist,
 427                                int idx, int prot, int mask, int fd)
 428 {
 429         evlist->mmap[idx].prev = 0;
 430         evlist->mmap[idx].mask = mask;
 431         evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
 432                                       MAP_SHARED, fd, 0);
 433         if (evlist->mmap[idx].base == MAP_FAILED) {
 434                 evlist->mmap[idx].base = NULL;
 435                 return -1;
 436         }
 437
 438         perf_evlist__add_pollfd(evlist, fd);
 439         return 0;
 440 }
 441
 442 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
 443 {
 444         struct perf_evsel *evsel;
 445         int cpu, thread;
 446
 447         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 448                 int output = -1;
 449
 450                 for (thread = 0; thread < evlist->threads->nr; thread++) {
 451                         list_for_each_entry(evsel, &evlist->entries, node) {
 452                                 int fd = FD(evsel, cpu, thread);
 453
 454                                 if (output == -1) {
 455                                         output = fd;
 456                                         if (__perf_evlist__mmap(evlist, cpu,
 457                                                                 prot, mask, output) < 0)
 458                                                 goto out_unmap;
 459                                 } else {
 460                                         if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 461                                                 goto out_unmap;
 462                                 }
 463
 464                                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 465                                     perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
 466                                         goto out_unmap;
 467                         }
 468                 }
 469         }
 470
 471         return 0;
 472
 473 out_unmap:
 474         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 475                 if (evlist->mmap[cpu].base != NULL) {
 476                         munmap(evlist->mmap[cpu].base, evlist->mmap_len);
 477                         evlist->mmap[cpu].base = NULL;
 478                 }
 479         }
 480         return -1;
 481 }
 482
 483 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
 484 {
 485         struct perf_evsel *evsel;
 486         int thread;
 487
 488         for (thread = 0; thread < evlist->threads->nr; thread++) {
 489                 int output = -1;
 490
 491                 list_for_each_entry(evsel, &evlist->entries, node) {
 492                         int fd = FD(evsel, 0, thread);
 493
 494                         if (output == -1) {
 495                                 output = fd;
 496                                 if (__perf_evlist__mmap(evlist, thread,
 497                                                         prot, mask, output) < 0)
 498                                         goto out_unmap;
 499                         } else {
 500                                 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 501                                         goto out_unmap;
 502                         }
 503
 504                         if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 505                             perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
 506                                 goto out_unmap;
 507                 }
 508         }
 509
 510         return 0;
 511
 512 out_unmap:
 513         for (thread = 0; thread < evlist->threads->nr; thread++) {
 514                 if (evlist->mmap[thread].base != NULL) {
 515                         munmap(evlist->mmap[thread].base, evlist->mmap_len);
 516                         evlist->mmap[thread].base = NULL;
 517                 }
 518         }
 519         return -1;
 520 }
 521
 522 /** perf_evlist__mmap - Create per cpu maps to receive events
 523  *
 524  * @evlist - list of events
 525  * @pages - map length in pages
 526  * @overwrite - overwrite older events?
 527  *
 528  * If overwrite is false the user needs to signal event consuption using:
 529  *
 530  *      struct perf_mmap *m = &evlist->mmap[cpu];
 531  *      unsigned int head = perf_mmap__read_head(m);
 532  *
 533  *      perf_mmap__write_tail(m, head)
 534  *
 535  * Using perf_evlist__read_on_cpu does this automatically.
 536  */
 537 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
 538                       bool overwrite)
 539 {
 540         struct perf_evsel *evsel;
 541         const struct cpu_map *cpus = evlist->cpus;
 542         const struct thread_map *threads = evlist->threads;
 543         int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
 544
 545         /* 512 kiB: default amount of unprivileged mlocked memory */
 546         if (pages == UINT_MAX)
 547                 pages = (512 * 1024) / page_size;
 548         else if (!is_power_of_2(pages))
 549                 return -EINVAL;
 550
 551         mask = pages * page_size - 1;
 552
 553         if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
 554                 return -ENOMEM;
 555
 556         if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
 557                 return -ENOMEM;
 558
 559         evlist->overwrite = overwrite;
 560         evlist->mmap_len = (pages + 1) * page_size;
 561
 562         list_for_each_entry(evsel, &evlist->entries, node) {
 563                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 564                     evsel->sample_id == NULL &&
 565                     perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
 566                         return -ENOMEM;
 567         }
 568
 569         if (cpu_map__all(cpus))
 570                 return perf_evlist__mmap_per_thread(evlist, prot, mask);
 571
 572         return perf_evlist__mmap_per_cpu(evlist, prot, mask);
 573 }
 574
 575 int perf_evlist__create_maps(struct perf_evlist *evlist,
 576                              struct perf_target *target)
 577 {
 578         evlist->threads = thread_map__new_str(target->pid, target->tid,
 579                                               target->uid);
 580
 581         if (evlist->threads == NULL)
 582                 return -1;
 583
 584         if (perf_target__has_task(target))
 585                 evlist->cpus = cpu_map__dummy_new();
 586         else if (!perf_target__has_cpu(target) && !target->uses_mmap)
 587                 evlist->cpus = cpu_map__dummy_new();
 588         else
 589                 evlist->cpus = cpu_map__new(target->cpu_list);
 590
 591         if (evlist->cpus == NULL)
 592                 goto out_delete_threads;
 593
 594         return 0;
 595
 596 out_delete_threads:
 597         thread_map__delete(evlist->threads);
 598         return -1;
 599 }
 600
 601 void perf_evlist__delete_maps(struct perf_evlist *evlist)
 602 {
 603         cpu_map__delete(evlist->cpus);
 604         thread_map__delete(evlist->threads);
 605         evlist->cpus    = NULL;
 606         evlist->threads = NULL;
 607 }
 608
 609 int perf_evlist__apply_filters(struct perf_evlist *evlist)
 610 {
 611         struct perf_evsel *evsel;
 612         int err = 0;
 613         const int ncpus = cpu_map__nr(evlist->cpus),
 614                   nthreads = evlist->threads->nr;
 615
 616         list_for_each_entry(evsel, &evlist->entries, node) {
 617                 if (evsel->filter == NULL)
 618                         continue;
 619
 620                 err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
 621                 if (err)
 622                         break;
 623         }
 624
 625         return err;
 626 }
 627
 628 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
 629 {
 630         struct perf_evsel *evsel;
 631         int err = 0;
 632         const int ncpus = cpu_map__nr(evlist->cpus),
 633                   nthreads = evlist->threads->nr;
 634
 635         list_for_each_entry(evsel, &evlist->entries, node) {
 636                 err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
 637                 if (err)
 638                         break;
 639         }
 640
 641         return err;
 642 }
 643
 644 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
 645 {
 646         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 647
 648         list_for_each_entry_continue(pos, &evlist->entries, node) {
 649                 if (first->attr.sample_type != pos->attr.sample_type)
 650                         return false;
 651         }
 652
 653         return true;
 654 }
 655
 656 u64 perf_evlist__sample_type(struct perf_evlist *evlist)
 657 {
 658         struct perf_evsel *first = perf_evlist__first(evlist);
 659         return first->attr.sample_type;
 660 }
 661
 662 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
 663 {
 664         struct perf_evsel *first = perf_evlist__first(evlist);
 665         struct perf_sample *data;
 666         u64 sample_type;
 667         u16 size = 0;
 668
 669         if (!first->attr.sample_id_all)
 670                 goto out;
 671
 672         sample_type = first->attr.sample_type;
 673
 674         if (sample_type & PERF_SAMPLE_TID)
 675                 size += sizeof(data->tid) * 2;
 676
 677        if (sample_type & PERF_SAMPLE_TIME)
 678                 size += sizeof(data->time);
 679
 680         if (sample_type & PERF_SAMPLE_ID)
 681                 size += sizeof(data->id);
 682
 683         if (sample_type & PERF_SAMPLE_STREAM_ID)
 684                 size += sizeof(data->stream_id);
 685
 686         if (sample_type & PERF_SAMPLE_CPU)
 687                 size += sizeof(data->cpu) * 2;
 688 out:
 689         return size;
 690 }
 691
 692 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
 693 {
 694         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 695
 696         list_for_each_entry_continue(pos, &evlist->entries, node) {
 697                 if (first->attr.sample_id_all != pos->attr.sample_id_all)
 698                         return false;
 699         }
 700
 701         return true;
 702 }
 703
 704 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
 705 {
 706         struct perf_evsel *first = perf_evlist__first(evlist);
 707         return first->attr.sample_id_all;
 708 }
 709
 710 void perf_evlist__set_selected(struct perf_evlist *evlist,
 711                                struct perf_evsel *evsel)
 712 {
 713         evlist->selected = evsel;
 714 }
 715
 716 int perf_evlist__open(struct perf_evlist *evlist)
 717 {
 718         struct perf_evsel *evsel;
 719         int err, ncpus, nthreads;
 720
 721         list_for_each_entry(evsel, &evlist->entries, node) {
 722                 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
 723                 if (err < 0)
 724                         goto out_err;
 725         }
 726
 727         return 0;
 728 out_err:
 729         ncpus = evlist->cpus ? evlist->cpus->nr : 1;
 730         nthreads = evlist->threads ? evlist->threads->nr : 1;
 731
 732         list_for_each_entry_reverse(evsel, &evlist->entries, node)
 733                 perf_evsel__close(evsel, ncpus, nthreads);
 734
 735         errno = -err;
 736         return err;
 737 }
 738
 739 int perf_evlist__prepare_workload(struct perf_evlist *evlist,
 740                                   struct perf_record_opts *opts,
 741                                   const char *argv[])
 742 {
 743         int child_ready_pipe[2], go_pipe[2];
 744         char bf;
 745
 746         if (pipe(child_ready_pipe) < 0) {
 747                 perror("failed to create 'ready' pipe");
 748                 return -1;
 749         }
 750
 751         if (pipe(go_pipe) < 0) {
 752                 perror("failed to create 'go' pipe");
 753                 goto out_close_ready_pipe;
 754         }
 755
 756         evlist->workload.pid = fork();
 757         if (evlist->workload.pid < 0) {
 758                 perror("failed to fork");
 759                 goto out_close_pipes;
 760         }
 761
 762         if (!evlist->workload.pid) {
 763                 if (opts->pipe_output)
 764                         dup2(2, 1);
 765
 766                 close(child_ready_pipe[0]);
 767                 close(go_pipe[1]);
 768                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 769
 770                 /*
 771                  * Do a dummy execvp to get the PLT entry resolved,
 772                  * so we avoid the resolver overhead on the real
 773                  * execvp call.
 774                  */
 775                 execvp("", (char **)argv);
 776
 777                 /*
 778                  * Tell the parent we're ready to go
 779                  */
 780                 close(child_ready_pipe[1]);
 781
 782                 /*
 783                  * Wait until the parent tells us to go.
 784                  */
 785                 if (read(go_pipe[0], &bf, 1) == -1)
 786                         perror("unable to read pipe");
 787
 788                 execvp(argv[0], (char **)argv);
 789
 790                 perror(argv[0]);
 791                 kill(getppid(), SIGUSR1);
 792                 exit(-1);
 793         }
 794
 795         if (perf_target__none(&opts->target))
 796                 evlist->threads->map[0] = evlist->workload.pid;
 797
 798         close(child_ready_pipe[1]);
 799         close(go_pipe[0]);
 800         /*
 801          * wait for child to settle
 802          */
 803         if (read(child_ready_pipe[0], &bf, 1) == -1) {
 804                 perror("unable to read pipe");
 805                 goto out_close_pipes;
 806         }
 807
 808         evlist->workload.cork_fd = go_pipe[1];
 809         close(child_ready_pipe[0]);
 810         return 0;
 811
 812 out_close_pipes:
 813         close(go_pipe[0]);
 814         close(go_pipe[1]);
 815 out_close_ready_pipe:
 816         close(child_ready_pipe[0]);
 817         close(child_ready_pipe[1]);
 818         return -1;
 819 }
 820
 821 int perf_evlist__start_workload(struct perf_evlist *evlist)
 822 {
 823         if (evlist->workload.cork_fd > 0) {
 824                 /*
 825                  * Remove the cork, let it rip!
 826                  */
 827                 return close(evlist->workload.cork_fd);
 828         }
 829
 830         return 0;
 831 }
 832
 833 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
 834                               struct perf_sample *sample)
 835 {
 836         struct perf_evsel *evsel = perf_evlist__first(evlist);
 837         return perf_evsel__parse_sample(evsel, event, sample);
 838 }
 839
 840 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
 841 {
 842         struct perf_evsel *evsel;
 843         size_t printed = 0;
 844
 845         list_for_each_entry(evsel, &evlist->entries, node) {
 846                 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
 847                                    perf_evsel__name(evsel));
 848         }
 849
 850         return printed + fprintf(fp, "\n");;
 851 }