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 <lk/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(void)
  42 {
  43         struct perf_evlist *evlist = zalloc(sizeof(*evlist));
  44
  45         if (evlist != NULL)
  46                 perf_evlist__init(evlist, NULL, NULL);
  47
  48         return evlist;
  49 }
  50
  51 void perf_evlist__config(struct perf_evlist *evlist,
  52                         struct perf_record_opts *opts)
  53 {
  54         struct perf_evsel *evsel;
  55         /*
  56          * Set the evsel leader links before we configure attributes,
  57          * since some might depend on this info.
  58          */
  59         if (opts->group)
  60                 perf_evlist__set_leader(evlist);
  61
  62         if (evlist->cpus->map[0] < 0)
  63                 opts->no_inherit = true;
  64
  65         list_for_each_entry(evsel, &evlist->entries, node) {
  66                 perf_evsel__config(evsel, opts);
  67
  68                 if (evlist->nr_entries > 1)
  69                         perf_evsel__set_sample_id(evsel);
  70         }
  71 }
  72
  73 static void perf_evlist__purge(struct perf_evlist *evlist)
  74 {
  75         struct perf_evsel *pos, *n;
  76
  77         list_for_each_entry_safe(pos, n, &evlist->entries, node) {
  78                 list_del_init(&pos->node);
  79                 perf_evsel__delete(pos);
  80         }
  81
  82         evlist->nr_entries = 0;
  83 }
  84
  85 void perf_evlist__exit(struct perf_evlist *evlist)
  86 {
  87         free(evlist->mmap);
  88         free(evlist->pollfd);
  89         evlist->mmap = NULL;
  90         evlist->pollfd = NULL;
  91 }
  92
  93 void perf_evlist__delete(struct perf_evlist *evlist)
  94 {
  95         perf_evlist__purge(evlist);
  96         perf_evlist__exit(evlist);
  97         free(evlist);
  98 }
  99
 100 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
 101 {
 102         list_add_tail(&entry->node, &evlist->entries);
 103         ++evlist->nr_entries;
 104 }
 105
 106 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
 107                                    struct list_head *list,
 108                                    int nr_entries)
 109 {
 110         list_splice_tail(list, &evlist->entries);
 111         evlist->nr_entries += nr_entries;
 112 }
 113
 114 void __perf_evlist__set_leader(struct list_head *list)
 115 {
 116         struct perf_evsel *evsel, *leader;
 117
 118         leader = list_entry(list->next, struct perf_evsel, node);
 119         evsel = list_entry(list->prev, struct perf_evsel, node);
 120
 121         leader->nr_members = evsel->idx - leader->idx + 1;
 122
 123         list_for_each_entry(evsel, list, node) {
 124                 evsel->leader = leader;
 125         }
 126 }
 127
 128 void perf_evlist__set_leader(struct perf_evlist *evlist)
 129 {
 130         if (evlist->nr_entries) {
 131                 evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
 132                 __perf_evlist__set_leader(&evlist->entries);
 133         }
 134 }
 135
 136 int perf_evlist__add_default(struct perf_evlist *evlist)
 137 {
 138         struct perf_event_attr attr = {
 139                 .type = PERF_TYPE_HARDWARE,
 140                 .config = PERF_COUNT_HW_CPU_CYCLES,
 141         };
 142         struct perf_evsel *evsel;
 143
 144         event_attr_init(&attr);
 145
 146         evsel = perf_evsel__new(&attr, 0);
 147         if (evsel == NULL)
 148                 goto error;
 149
 150         /* use strdup() because free(evsel) assumes name is allocated */
 151         evsel->name = strdup("cycles");
 152         if (!evsel->name)
 153                 goto error_free;
 154
 155         perf_evlist__add(evlist, evsel);
 156         return 0;
 157 error_free:
 158         perf_evsel__delete(evsel);
 159 error:
 160         return -ENOMEM;
 161 }
 162
 163 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
 164                                   struct perf_event_attr *attrs, size_t nr_attrs)
 165 {
 166         struct perf_evsel *evsel, *n;
 167         LIST_HEAD(head);
 168         size_t i;
 169
 170         for (i = 0; i < nr_attrs; i++) {
 171                 evsel = perf_evsel__new(attrs + i, evlist->nr_entries + i);
 172                 if (evsel == NULL)
 173                         goto out_delete_partial_list;
 174                 list_add_tail(&evsel->node, &head);
 175         }
 176
 177         perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
 178
 179         return 0;
 180
 181 out_delete_partial_list:
 182         list_for_each_entry_safe(evsel, n, &head, node)
 183                 perf_evsel__delete(evsel);
 184         return -1;
 185 }
 186
 187 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
 188                                      struct perf_event_attr *attrs, size_t nr_attrs)
 189 {
 190         size_t i;
 191
 192         for (i = 0; i < nr_attrs; i++)
 193                 event_attr_init(attrs + i);
 194
 195         return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
 196 }
 197
 198 struct perf_evsel *
 199 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
 200 {
 201         struct perf_evsel *evsel;
 202
 203         list_for_each_entry(evsel, &evlist->entries, node) {
 204                 if (evsel->attr.type   == PERF_TYPE_TRACEPOINT &&
 205                     (int)evsel->attr.config == id)
 206                         return evsel;
 207         }
 208
 209         return NULL;
 210 }
 211
 212 int perf_evlist__add_newtp(struct perf_evlist *evlist,
 213                            const char *sys, const char *name, void *handler)
 214 {
 215         struct perf_evsel *evsel;
 216
 217         evsel = perf_evsel__newtp(sys, name, evlist->nr_entries);
 218         if (evsel == NULL)
 219                 return -1;
 220
 221         evsel->handler.func = handler;
 222         perf_evlist__add(evlist, evsel);
 223         return 0;
 224 }
 225
 226 void perf_evlist__disable(struct perf_evlist *evlist)
 227 {
 228         int cpu, thread;
 229         struct perf_evsel *pos;
 230         int nr_cpus = cpu_map__nr(evlist->cpus);
 231         int nr_threads = thread_map__nr(evlist->threads);
 232
 233         for (cpu = 0; cpu < nr_cpus; cpu++) {
 234                 list_for_each_entry(pos, &evlist->entries, node) {
 235                         if (!perf_evsel__is_group_leader(pos))
 236                                 continue;
 237                         for (thread = 0; thread < nr_threads; thread++)
 238                                 ioctl(FD(pos, cpu, thread),
 239                                       PERF_EVENT_IOC_DISABLE, 0);
 240                 }
 241         }
 242 }
 243
 244 void perf_evlist__enable(struct perf_evlist *evlist)
 245 {
 246         int cpu, thread;
 247         struct perf_evsel *pos;
 248         int nr_cpus = cpu_map__nr(evlist->cpus);
 249         int nr_threads = thread_map__nr(evlist->threads);
 250
 251         for (cpu = 0; cpu < nr_cpus; cpu++) {
 252                 list_for_each_entry(pos, &evlist->entries, node) {
 253                         if (!perf_evsel__is_group_leader(pos))
 254                                 continue;
 255                         for (thread = 0; thread < nr_threads; thread++)
 256                                 ioctl(FD(pos, cpu, thread),
 257                                       PERF_EVENT_IOC_ENABLE, 0);
 258                 }
 259         }
 260 }
 261
 262 static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 263 {
 264         int nr_cpus = cpu_map__nr(evlist->cpus);
 265         int nr_threads = thread_map__nr(evlist->threads);
 266         int nfds = nr_cpus * nr_threads * evlist->nr_entries;
 267         evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
 268         return evlist->pollfd != NULL ? 0 : -ENOMEM;
 269 }
 270
 271 void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
 272 {
 273         fcntl(fd, F_SETFL, O_NONBLOCK);
 274         evlist->pollfd[evlist->nr_fds].fd = fd;
 275         evlist->pollfd[evlist->nr_fds].events = POLLIN;
 276         evlist->nr_fds++;
 277 }
 278
 279 static void perf_evlist__id_hash(struct perf_evlist *evlist,
 280                                  struct perf_evsel *evsel,
 281                                  int cpu, int thread, u64 id)
 282 {
 283         int hash;
 284         struct perf_sample_id *sid = SID(evsel, cpu, thread);
 285
 286         sid->id = id;
 287         sid->evsel = evsel;
 288         hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
 289         hlist_add_head(&sid->node, &evlist->heads[hash]);
 290 }
 291
 292 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
 293                          int cpu, int thread, u64 id)
 294 {
 295         perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
 296         evsel->id[evsel->ids++] = id;
 297 }
 298
 299 static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
 300                                   struct perf_evsel *evsel,
 301                                   int cpu, int thread, int fd)
 302 {
 303         u64 read_data[4] = { 0, };
 304         int id_idx = 1; /* The first entry is the counter value */
 305
 306         if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
 307             read(fd, &read_data, sizeof(read_data)) == -1)
 308                 return -1;
 309
 310         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 311                 ++id_idx;
 312         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 313                 ++id_idx;
 314
 315         perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]);
 316         return 0;
 317 }
 318
 319 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
 320 {
 321         struct hlist_head *head;
 322         struct hlist_node *pos;
 323         struct perf_sample_id *sid;
 324         int hash;
 325
 326         if (evlist->nr_entries == 1)
 327                 return perf_evlist__first(evlist);
 328
 329         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 330         head = &evlist->heads[hash];
 331
 332         hlist_for_each_entry(sid, pos, head, node)
 333                 if (sid->id == id)
 334                         return sid->evsel;
 335
 336         if (!perf_evlist__sample_id_all(evlist))
 337                 return perf_evlist__first(evlist);
 338
 339         return NULL;
 340 }
 341
 342 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 343 {
 344         struct perf_mmap *md = &evlist->mmap[idx];
 345         unsigned int head = perf_mmap__read_head(md);
 346         unsigned int old = md->prev;
 347         unsigned char *data = md->base + page_size;
 348         union perf_event *event = NULL;
 349
 350         if (evlist->overwrite) {
 351                 /*
 352                  * If we're further behind than half the buffer, there's a chance
 353                  * the writer will bite our tail and mess up the samples under us.
 354                  *
 355                  * If we somehow ended up ahead of the head, we got messed up.
 356                  *
 357                  * In either case, truncate and restart at head.
 358                  */
 359                 int diff = head - old;
 360                 if (diff > md->mask / 2 || diff < 0) {
 361                         fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
 362
 363                         /*
 364                          * head points to a known good entry, start there.
 365                          */
 366                         old = head;
 367                 }
 368         }
 369
 370         if (old != head) {
 371                 size_t size;
 372
 373                 event = (union perf_event *)&data[old & md->mask];
 374                 size = event->header.size;
 375
 376                 /*
 377                  * Event straddles the mmap boundary -- header should always
 378                  * be inside due to u64 alignment of output.
 379                  */
 380                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
 381                         unsigned int offset = old;
 382                         unsigned int len = min(sizeof(*event), size), cpy;
 383                         void *dst = &md->event_copy;
 384
 385                         do {
 386                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
 387                                 memcpy(dst, &data[offset & md->mask], cpy);
 388                                 offset += cpy;
 389                                 dst += cpy;
 390                                 len -= cpy;
 391                         } while (len);
 392
 393                         event = &md->event_copy;
 394                 }
 395
 396                 old += size;
 397         }
 398
 399         md->prev = old;
 400
 401         if (!evlist->overwrite)
 402                 perf_mmap__write_tail(md, old);
 403
 404         return event;
 405 }
 406
 407 void perf_evlist__munmap(struct perf_evlist *evlist)
 408 {
 409         int i;
 410
 411         for (i = 0; i < evlist->nr_mmaps; i++) {
 412                 if (evlist->mmap[i].base != NULL) {
 413                         munmap(evlist->mmap[i].base, evlist->mmap_len);
 414                         evlist->mmap[i].base = NULL;
 415                 }
 416         }
 417
 418         free(evlist->mmap);
 419         evlist->mmap = NULL;
 420 }
 421
 422 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
 423 {
 424         evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
 425         if (cpu_map__all(evlist->cpus))
 426                 evlist->nr_mmaps = thread_map__nr(evlist->threads);
 427         evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
 428         return evlist->mmap != NULL ? 0 : -ENOMEM;
 429 }
 430
 431 static int __perf_evlist__mmap(struct perf_evlist *evlist,
 432                                int idx, int prot, int mask, int fd)
 433 {
 434         evlist->mmap[idx].prev = 0;
 435         evlist->mmap[idx].mask = mask;
 436         evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
 437                                       MAP_SHARED, fd, 0);
 438         if (evlist->mmap[idx].base == MAP_FAILED) {
 439                 evlist->mmap[idx].base = NULL;
 440                 return -1;
 441         }
 442
 443         perf_evlist__add_pollfd(evlist, fd);
 444         return 0;
 445 }
 446
 447 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
 448 {
 449         struct perf_evsel *evsel;
 450         int cpu, thread;
 451         int nr_cpus = cpu_map__nr(evlist->cpus);
 452         int nr_threads = thread_map__nr(evlist->threads);
 453
 454         for (cpu = 0; cpu < nr_cpus; cpu++) {
 455                 int output = -1;
 456
 457                 for (thread = 0; thread < nr_threads; thread++) {
 458                         list_for_each_entry(evsel, &evlist->entries, node) {
 459                                 int fd = FD(evsel, cpu, thread);
 460
 461                                 if (output == -1) {
 462                                         output = fd;
 463                                         if (__perf_evlist__mmap(evlist, cpu,
 464                                                                 prot, mask, output) < 0)
 465                                                 goto out_unmap;
 466                                 } else {
 467                                         if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 468                                                 goto out_unmap;
 469                                 }
 470
 471                                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 472                                     perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
 473                                         goto out_unmap;
 474                         }
 475                 }
 476         }
 477
 478         return 0;
 479
 480 out_unmap:
 481         for (cpu = 0; cpu < nr_cpus; cpu++) {
 482                 if (evlist->mmap[cpu].base != NULL) {
 483                         munmap(evlist->mmap[cpu].base, evlist->mmap_len);
 484                         evlist->mmap[cpu].base = NULL;
 485                 }
 486         }
 487         return -1;
 488 }
 489
 490 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
 491 {
 492         struct perf_evsel *evsel;
 493         int thread;
 494         int nr_threads = thread_map__nr(evlist->threads);
 495
 496         for (thread = 0; thread < nr_threads; thread++) {
 497                 int output = -1;
 498
 499                 list_for_each_entry(evsel, &evlist->entries, node) {
 500                         int fd = FD(evsel, 0, thread);
 501
 502                         if (output == -1) {
 503                                 output = fd;
 504                                 if (__perf_evlist__mmap(evlist, thread,
 505                                                         prot, mask, output) < 0)
 506                                         goto out_unmap;
 507                         } else {
 508                                 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 509                                         goto out_unmap;
 510                         }
 511
 512                         if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 513                             perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
 514                                 goto out_unmap;
 515                 }
 516         }
 517
 518         return 0;
 519
 520 out_unmap:
 521         for (thread = 0; thread < nr_threads; thread++) {
 522                 if (evlist->mmap[thread].base != NULL) {
 523                         munmap(evlist->mmap[thread].base, evlist->mmap_len);
 524                         evlist->mmap[thread].base = NULL;
 525                 }
 526         }
 527         return -1;
 528 }
 529
 530 /** perf_evlist__mmap - Create per cpu maps to receive events
 531  *
 532  * @evlist - list of events
 533  * @pages - map length in pages
 534  * @overwrite - overwrite older events?
 535  *
 536  * If overwrite is false the user needs to signal event consuption using:
 537  *
 538  *      struct perf_mmap *m = &evlist->mmap[cpu];
 539  *      unsigned int head = perf_mmap__read_head(m);
 540  *
 541  *      perf_mmap__write_tail(m, head)
 542  *
 543  * Using perf_evlist__read_on_cpu does this automatically.
 544  */
 545 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
 546                       bool overwrite)
 547 {
 548         struct perf_evsel *evsel;
 549         const struct cpu_map *cpus = evlist->cpus;
 550         const struct thread_map *threads = evlist->threads;
 551         int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
 552
 553         /* 512 kiB: default amount of unprivileged mlocked memory */
 554         if (pages == UINT_MAX)
 555                 pages = (512 * 1024) / page_size;
 556         else if (!is_power_of_2(pages))
 557                 return -EINVAL;
 558
 559         mask = pages * page_size - 1;
 560
 561         if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
 562                 return -ENOMEM;
 563
 564         if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
 565                 return -ENOMEM;
 566
 567         evlist->overwrite = overwrite;
 568         evlist->mmap_len = (pages + 1) * page_size;
 569
 570         list_for_each_entry(evsel, &evlist->entries, node) {
 571                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 572                     evsel->sample_id == NULL &&
 573                     perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
 574                         return -ENOMEM;
 575         }
 576
 577         if (cpu_map__all(cpus))
 578                 return perf_evlist__mmap_per_thread(evlist, prot, mask);
 579
 580         return perf_evlist__mmap_per_cpu(evlist, prot, mask);
 581 }
 582
 583 int perf_evlist__create_maps(struct perf_evlist *evlist,
 584                              struct perf_target *target)
 585 {
 586         evlist->threads = thread_map__new_str(target->pid, target->tid,
 587                                               target->uid);
 588
 589         if (evlist->threads == NULL)
 590                 return -1;
 591
 592         if (perf_target__has_task(target))
 593                 evlist->cpus = cpu_map__dummy_new();
 594         else if (!perf_target__has_cpu(target) && !target->uses_mmap)
 595                 evlist->cpus = cpu_map__dummy_new();
 596         else
 597                 evlist->cpus = cpu_map__new(target->cpu_list);
 598
 599         if (evlist->cpus == NULL)
 600                 goto out_delete_threads;
 601
 602         return 0;
 603
 604 out_delete_threads:
 605         thread_map__delete(evlist->threads);
 606         return -1;
 607 }
 608
 609 void perf_evlist__delete_maps(struct perf_evlist *evlist)
 610 {
 611         cpu_map__delete(evlist->cpus);
 612         thread_map__delete(evlist->threads);
 613         evlist->cpus    = NULL;
 614         evlist->threads = NULL;
 615 }
 616
 617 int perf_evlist__apply_filters(struct perf_evlist *evlist)
 618 {
 619         struct perf_evsel *evsel;
 620         int err = 0;
 621         const int ncpus = cpu_map__nr(evlist->cpus),
 622                   nthreads = thread_map__nr(evlist->threads);
 623
 624         list_for_each_entry(evsel, &evlist->entries, node) {
 625                 if (evsel->filter == NULL)
 626                         continue;
 627
 628                 err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
 629                 if (err)
 630                         break;
 631         }
 632
 633         return err;
 634 }
 635
 636 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
 637 {
 638         struct perf_evsel *evsel;
 639         int err = 0;
 640         const int ncpus = cpu_map__nr(evlist->cpus),
 641                   nthreads = thread_map__nr(evlist->threads);
 642
 643         list_for_each_entry(evsel, &evlist->entries, node) {
 644                 err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
 645                 if (err)
 646                         break;
 647         }
 648
 649         return err;
 650 }
 651
 652 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
 653 {
 654         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 655
 656         list_for_each_entry_continue(pos, &evlist->entries, node) {
 657                 if (first->attr.sample_type != pos->attr.sample_type)
 658                         return false;
 659         }
 660
 661         return true;
 662 }
 663
 664 u64 perf_evlist__sample_type(struct perf_evlist *evlist)
 665 {
 666         struct perf_evsel *first = perf_evlist__first(evlist);
 667         return first->attr.sample_type;
 668 }
 669
 670 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
 671 {
 672         struct perf_evsel *first = perf_evlist__first(evlist);
 673         struct perf_sample *data;
 674         u64 sample_type;
 675         u16 size = 0;
 676
 677         if (!first->attr.sample_id_all)
 678                 goto out;
 679
 680         sample_type = first->attr.sample_type;
 681
 682         if (sample_type & PERF_SAMPLE_TID)
 683                 size += sizeof(data->tid) * 2;
 684
 685        if (sample_type & PERF_SAMPLE_TIME)
 686                 size += sizeof(data->time);
 687
 688         if (sample_type & PERF_SAMPLE_ID)
 689                 size += sizeof(data->id);
 690
 691         if (sample_type & PERF_SAMPLE_STREAM_ID)
 692                 size += sizeof(data->stream_id);
 693
 694         if (sample_type & PERF_SAMPLE_CPU)
 695                 size += sizeof(data->cpu) * 2;
 696 out:
 697         return size;
 698 }
 699
 700 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
 701 {
 702         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 703
 704         list_for_each_entry_continue(pos, &evlist->entries, node) {
 705                 if (first->attr.sample_id_all != pos->attr.sample_id_all)
 706                         return false;
 707         }
 708
 709         return true;
 710 }
 711
 712 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
 713 {
 714         struct perf_evsel *first = perf_evlist__first(evlist);
 715         return first->attr.sample_id_all;
 716 }
 717
 718 void perf_evlist__set_selected(struct perf_evlist *evlist,
 719                                struct perf_evsel *evsel)
 720 {
 721         evlist->selected = evsel;
 722 }
 723
 724 int perf_evlist__open(struct perf_evlist *evlist)
 725 {
 726         struct perf_evsel *evsel;
 727         int err, ncpus, nthreads;
 728
 729         list_for_each_entry(evsel, &evlist->entries, node) {
 730                 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
 731                 if (err < 0)
 732                         goto out_err;
 733         }
 734
 735         return 0;
 736 out_err:
 737         ncpus = cpu_map__nr(evlist->cpus);
 738         nthreads = thread_map__nr(evlist->threads);
 739
 740         list_for_each_entry_reverse(evsel, &evlist->entries, node)
 741                 perf_evsel__close(evsel, ncpus, nthreads);
 742
 743         errno = -err;
 744         return err;
 745 }
 746
 747 int perf_evlist__prepare_workload(struct perf_evlist *evlist,
 748                                   struct perf_target *target,
 749                                   struct perf_record_opts *opts,
 750                                   const char *argv[])
 751 {
 752         int child_ready_pipe[2], go_pipe[2];
 753         char bf;
 754
 755         if (pipe(child_ready_pipe) < 0) {
 756                 perror("failed to create 'ready' pipe");
 757                 return -1;
 758         }
 759
 760         if (pipe(go_pipe) < 0) {
 761                 perror("failed to create 'go' pipe");
 762                 goto out_close_ready_pipe;
 763         }
 764
 765         evlist->workload.pid = fork();
 766         if (evlist->workload.pid < 0) {
 767                 perror("failed to fork");
 768                 goto out_close_pipes;
 769         }
 770
 771         if (!evlist->workload.pid) {
 772                 if (opts->pipe_output)
 773                         dup2(2, 1);
 774
 775                 close(child_ready_pipe[0]);
 776                 close(go_pipe[1]);
 777                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 778
 779                 /*
 780                  * Do a dummy execvp to get the PLT entry resolved,
 781                  * so we avoid the resolver overhead on the real
 782                  * execvp call.
 783                  */
 784                 execvp("", (char **)argv);
 785
 786                 /*
 787                  * Tell the parent we're ready to go
 788                  */
 789                 close(child_ready_pipe[1]);
 790
 791                 /*
 792                  * Wait until the parent tells us to go.
 793                  */
 794                 if (read(go_pipe[0], &bf, 1) == -1)
 795                         perror("unable to read pipe");
 796
 797                 execvp(argv[0], (char **)argv);
 798
 799                 perror(argv[0]);
 800                 kill(getppid(), SIGUSR1);
 801                 exit(-1);
 802         }
 803
 804         if (perf_target__none(target))
 805                 evlist->threads->map[0] = evlist->workload.pid;
 806
 807         close(child_ready_pipe[1]);
 808         close(go_pipe[0]);
 809         /*
 810          * wait for child to settle
 811          */
 812         if (read(child_ready_pipe[0], &bf, 1) == -1) {
 813                 perror("unable to read pipe");
 814                 goto out_close_pipes;
 815         }
 816
 817         evlist->workload.cork_fd = go_pipe[1];
 818         close(child_ready_pipe[0]);
 819         return 0;
 820
 821 out_close_pipes:
 822         close(go_pipe[0]);
 823         close(go_pipe[1]);
 824 out_close_ready_pipe:
 825         close(child_ready_pipe[0]);
 826         close(child_ready_pipe[1]);
 827         return -1;
 828 }
 829
 830 int perf_evlist__start_workload(struct perf_evlist *evlist)
 831 {
 832         if (evlist->workload.cork_fd > 0) {
 833                 /*
 834                  * Remove the cork, let it rip!
 835                  */
 836                 return close(evlist->workload.cork_fd);
 837         }
 838
 839         return 0;
 840 }
 841
 842 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
 843                               struct perf_sample *sample)
 844 {
 845         struct perf_evsel *evsel = perf_evlist__first(evlist);
 846         return perf_evsel__parse_sample(evsel, event, sample);
 847 }
 848
 849 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
 850 {
 851         struct perf_evsel *evsel;
 852         size_t printed = 0;
 853
 854         list_for_each_entry(evsel, &evlist->entries, node) {
 855                 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
 856                                    perf_evsel__name(evsel));
 857         }
 858
 859         return printed + fprintf(fp, "\n");;
 860 }