Pileus Git - ~andy/linux/blob - tools/perf/util/evlist.c

   1 /*
   2  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   3  *
   4  * Parts came from builtin-{top,stat,record}.c, see those files for further
   5  * copyright notes.
   6  *
   7  * Released under the GPL v2. (and only v2, not any later version)
   8  */
   9 #include "util.h"
  10 #include "debugfs.h"
  11 #include <poll.h>
  12 #include "cpumap.h"
  13 #include "thread_map.h"
  14 #include "target.h"
  15 #include "evlist.h"
  16 #include "evsel.h"
  17 #include <unistd.h>
  18
  19 #include "parse-events.h"
  20
  21 #include <sys/mman.h>
  22
  23 #include <linux/bitops.h>
  24 #include <linux/hash.h>
  25
  26 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  27 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
  28
  29 void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
  30                        struct thread_map *threads)
  31 {
  32         int i;
  33
  34         for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
  35                 INIT_HLIST_HEAD(&evlist->heads[i]);
  36         INIT_LIST_HEAD(&evlist->entries);
  37         perf_evlist__set_maps(evlist, cpus, threads);
  38         evlist->workload.pid = -1;
  39 }
  40
  41 struct perf_evlist *perf_evlist__new(struct cpu_map *cpus,
  42                                      struct thread_map *threads)
  43 {
  44         struct perf_evlist *evlist = zalloc(sizeof(*evlist));
  45
  46         if (evlist != NULL)
  47                 perf_evlist__init(evlist, cpus, threads);
  48
  49         return evlist;
  50 }
  51
  52 void perf_evlist__config_attrs(struct perf_evlist *evlist,
  53                                struct perf_record_opts *opts)
  54 {
  55         struct perf_evsel *evsel, *first;
  56
  57         if (evlist->cpus->map[0] < 0)
  58                 opts->no_inherit = true;
  59
  60         first = list_entry(evlist->entries.next, struct perf_evsel, node);
  61
  62         list_for_each_entry(evsel, &evlist->entries, node) {
  63                 perf_evsel__config(evsel, opts, first);
  64
  65                 if (evlist->nr_entries > 1)
  66                         evsel->attr.sample_type |= PERF_SAMPLE_ID;
  67         }
  68 }
  69
  70 static void perf_evlist__purge(struct perf_evlist *evlist)
  71 {
  72         struct perf_evsel *pos, *n;
  73
  74         list_for_each_entry_safe(pos, n, &evlist->entries, node) {
  75                 list_del_init(&pos->node);
  76                 perf_evsel__delete(pos);
  77         }
  78
  79         evlist->nr_entries = 0;
  80 }
  81
  82 void perf_evlist__exit(struct perf_evlist *evlist)
  83 {
  84         free(evlist->mmap);
  85         free(evlist->pollfd);
  86         evlist->mmap = NULL;
  87         evlist->pollfd = NULL;
  88 }
  89
  90 void perf_evlist__delete(struct perf_evlist *evlist)
  91 {
  92         perf_evlist__purge(evlist);
  93         perf_evlist__exit(evlist);
  94         free(evlist);
  95 }
  96
  97 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
  98 {
  99         list_add_tail(&entry->node, &evlist->entries);
 100         ++evlist->nr_entries;
 101 }
 102
 103 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
 104                                    struct list_head *list,
 105                                    int nr_entries)
 106 {
 107         list_splice_tail(list, &evlist->entries);
 108         evlist->nr_entries += nr_entries;
 109 }
 110
 111 int perf_evlist__add_default(struct perf_evlist *evlist)
 112 {
 113         struct perf_event_attr attr = {
 114                 .type = PERF_TYPE_HARDWARE,
 115                 .config = PERF_COUNT_HW_CPU_CYCLES,
 116         };
 117         struct perf_evsel *evsel;
 118
 119         event_attr_init(&attr);
 120
 121         evsel = perf_evsel__new(&attr, 0);
 122         if (evsel == NULL)
 123                 goto error;
 124
 125         /* use strdup() because free(evsel) assumes name is allocated */
 126         evsel->name = strdup("cycles");
 127         if (!evsel->name)
 128                 goto error_free;
 129
 130         perf_evlist__add(evlist, evsel);
 131         return 0;
 132 error_free:
 133         perf_evsel__delete(evsel);
 134 error:
 135         return -ENOMEM;
 136 }
 137
 138 int perf_evlist__add_attrs(struct perf_evlist *evlist,
 139                            struct perf_event_attr *attrs, size_t nr_attrs)
 140 {
 141         struct perf_evsel *evsel, *n;
 142         LIST_HEAD(head);
 143         size_t i;
 144
 145         for (i = 0; i < nr_attrs; i++) {
 146                 evsel = perf_evsel__new(attrs + i, evlist->nr_entries + i);
 147                 if (evsel == NULL)
 148                         goto out_delete_partial_list;
 149                 list_add_tail(&evsel->node, &head);
 150         }
 151
 152         perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
 153
 154         return 0;
 155
 156 out_delete_partial_list:
 157         list_for_each_entry_safe(evsel, n, &head, node)
 158                 perf_evsel__delete(evsel);
 159         return -1;
 160 }
 161
 162 static int trace_event__id(const char *evname)
 163 {
 164         char *filename, *colon;
 165         int err = -1, fd;
 166
 167         if (asprintf(&filename, "%s/%s/id", tracing_events_path, evname) < 0)
 168                 return -1;
 169
 170         colon = strrchr(filename, ':');
 171         if (colon != NULL)
 172                 *colon = '/';
 173
 174         fd = open(filename, O_RDONLY);
 175         if (fd >= 0) {
 176                 char id[16];
 177                 if (read(fd, id, sizeof(id)) > 0)
 178                         err = atoi(id);
 179                 close(fd);
 180         }
 181
 182         free(filename);
 183         return err;
 184 }
 185
 186 int perf_evlist__add_tracepoints(struct perf_evlist *evlist,
 187                                  const char *tracepoints[],
 188                                  size_t nr_tracepoints)
 189 {
 190         int err;
 191         size_t i;
 192         struct perf_event_attr *attrs = zalloc(nr_tracepoints * sizeof(*attrs));
 193
 194         if (attrs == NULL)
 195                 return -1;
 196
 197         for (i = 0; i < nr_tracepoints; i++) {
 198                 err = trace_event__id(tracepoints[i]);
 199
 200                 if (err < 0)
 201                         goto out_free_attrs;
 202
 203                 attrs[i].type          = PERF_TYPE_TRACEPOINT;
 204                 attrs[i].config        = err;
 205                 attrs[i].sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
 206                                           PERF_SAMPLE_CPU);
 207                 attrs[i].sample_period = 1;
 208         }
 209
 210         err = perf_evlist__add_attrs(evlist, attrs, nr_tracepoints);
 211 out_free_attrs:
 212         free(attrs);
 213         return err;
 214 }
 215
 216 static struct perf_evsel *
 217         perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
 218 {
 219         struct perf_evsel *evsel;
 220
 221         list_for_each_entry(evsel, &evlist->entries, node) {
 222                 if (evsel->attr.type   == PERF_TYPE_TRACEPOINT &&
 223                     (int)evsel->attr.config == id)
 224                         return evsel;
 225         }
 226
 227         return NULL;
 228 }
 229
 230 int perf_evlist__set_tracepoints_handlers(struct perf_evlist *evlist,
 231                                           const struct perf_evsel_str_handler *assocs,
 232                                           size_t nr_assocs)
 233 {
 234         struct perf_evsel *evsel;
 235         int err;
 236         size_t i;
 237
 238         for (i = 0; i < nr_assocs; i++) {
 239                 err = trace_event__id(assocs[i].name);
 240                 if (err < 0)
 241                         goto out;
 242
 243                 evsel = perf_evlist__find_tracepoint_by_id(evlist, err);
 244                 if (evsel == NULL)
 245                         continue;
 246
 247                 err = -EEXIST;
 248                 if (evsel->handler.func != NULL)
 249                         goto out;
 250                 evsel->handler.func = assocs[i].handler;
 251         }
 252
 253         err = 0;
 254 out:
 255         return err;
 256 }
 257
 258 void perf_evlist__disable(struct perf_evlist *evlist)
 259 {
 260         int cpu, thread;
 261         struct perf_evsel *pos;
 262
 263         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 264                 list_for_each_entry(pos, &evlist->entries, node) {
 265                         for (thread = 0; thread < evlist->threads->nr; thread++)
 266                                 ioctl(FD(pos, cpu, thread), PERF_EVENT_IOC_DISABLE);
 267                 }
 268         }
 269 }
 270
 271 void perf_evlist__enable(struct perf_evlist *evlist)
 272 {
 273         int cpu, thread;
 274         struct perf_evsel *pos;
 275
 276         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 277                 list_for_each_entry(pos, &evlist->entries, node) {
 278                         for (thread = 0; thread < evlist->threads->nr; thread++)
 279                                 ioctl(FD(pos, cpu, thread), PERF_EVENT_IOC_ENABLE);
 280                 }
 281         }
 282 }
 283
 284 static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 285 {
 286         int nfds = evlist->cpus->nr * evlist->threads->nr * evlist->nr_entries;
 287         evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
 288         return evlist->pollfd != NULL ? 0 : -ENOMEM;
 289 }
 290
 291 void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
 292 {
 293         fcntl(fd, F_SETFL, O_NONBLOCK);
 294         evlist->pollfd[evlist->nr_fds].fd = fd;
 295         evlist->pollfd[evlist->nr_fds].events = POLLIN;
 296         evlist->nr_fds++;
 297 }
 298
 299 static void perf_evlist__id_hash(struct perf_evlist *evlist,
 300                                  struct perf_evsel *evsel,
 301                                  int cpu, int thread, u64 id)
 302 {
 303         int hash;
 304         struct perf_sample_id *sid = SID(evsel, cpu, thread);
 305
 306         sid->id = id;
 307         sid->evsel = evsel;
 308         hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
 309         hlist_add_head(&sid->node, &evlist->heads[hash]);
 310 }
 311
 312 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
 313                          int cpu, int thread, u64 id)
 314 {
 315         perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
 316         evsel->id[evsel->ids++] = id;
 317 }
 318
 319 static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
 320                                   struct perf_evsel *evsel,
 321                                   int cpu, int thread, int fd)
 322 {
 323         u64 read_data[4] = { 0, };
 324         int id_idx = 1; /* The first entry is the counter value */
 325
 326         if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
 327             read(fd, &read_data, sizeof(read_data)) == -1)
 328                 return -1;
 329
 330         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 331                 ++id_idx;
 332         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 333                 ++id_idx;
 334
 335         perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]);
 336         return 0;
 337 }
 338
 339 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
 340 {
 341         struct hlist_head *head;
 342         struct hlist_node *pos;
 343         struct perf_sample_id *sid;
 344         int hash;
 345
 346         if (evlist->nr_entries == 1)
 347                 return list_entry(evlist->entries.next, struct perf_evsel, node);
 348
 349         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 350         head = &evlist->heads[hash];
 351
 352         hlist_for_each_entry(sid, pos, head, node)
 353                 if (sid->id == id)
 354                         return sid->evsel;
 355
 356         if (!perf_evlist__sample_id_all(evlist))
 357                 return list_entry(evlist->entries.next, struct perf_evsel, node);
 358
 359         return NULL;
 360 }
 361
 362 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 363 {
 364         /* XXX Move this to perf.c, making it generally available */
 365         unsigned int page_size = sysconf(_SC_PAGE_SIZE);
 366         struct perf_mmap *md = &evlist->mmap[idx];
 367         unsigned int head = perf_mmap__read_head(md);
 368         unsigned int old = md->prev;
 369         unsigned char *data = md->base + page_size;
 370         union perf_event *event = NULL;
 371
 372         if (evlist->overwrite) {
 373                 /*
 374                  * If we're further behind than half the buffer, there's a chance
 375                  * the writer will bite our tail and mess up the samples under us.
 376                  *
 377                  * If we somehow ended up ahead of the head, we got messed up.
 378                  *
 379                  * In either case, truncate and restart at head.
 380                  */
 381                 int diff = head - old;
 382                 if (diff > md->mask / 2 || diff < 0) {
 383                         fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
 384
 385                         /*
 386                          * head points to a known good entry, start there.
 387                          */
 388                         old = head;
 389                 }
 390         }
 391
 392         if (old != head) {
 393                 size_t size;
 394
 395                 event = (union perf_event *)&data[old & md->mask];
 396                 size = event->header.size;
 397
 398                 /*
 399                  * Event straddles the mmap boundary -- header should always
 400                  * be inside due to u64 alignment of output.
 401                  */
 402                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
 403                         unsigned int offset = old;
 404                         unsigned int len = min(sizeof(*event), size), cpy;
 405                         void *dst = &evlist->event_copy;
 406
 407                         do {
 408                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
 409                                 memcpy(dst, &data[offset & md->mask], cpy);
 410                                 offset += cpy;
 411                                 dst += cpy;
 412                                 len -= cpy;
 413                         } while (len);
 414
 415                         event = &evlist->event_copy;
 416                 }
 417
 418                 old += size;
 419         }
 420
 421         md->prev = old;
 422
 423         if (!evlist->overwrite)
 424                 perf_mmap__write_tail(md, old);
 425
 426         return event;
 427 }
 428
 429 void perf_evlist__munmap(struct perf_evlist *evlist)
 430 {
 431         int i;
 432
 433         for (i = 0; i < evlist->nr_mmaps; i++) {
 434                 if (evlist->mmap[i].base != NULL) {
 435                         munmap(evlist->mmap[i].base, evlist->mmap_len);
 436                         evlist->mmap[i].base = NULL;
 437                 }
 438         }
 439
 440         free(evlist->mmap);
 441         evlist->mmap = NULL;
 442 }
 443
 444 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
 445 {
 446         evlist->nr_mmaps = evlist->cpus->nr;
 447         if (evlist->cpus->map[0] == -1)
 448                 evlist->nr_mmaps = evlist->threads->nr;
 449         evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
 450         return evlist->mmap != NULL ? 0 : -ENOMEM;
 451 }
 452
 453 static int __perf_evlist__mmap(struct perf_evlist *evlist,
 454                                int idx, int prot, int mask, int fd)
 455 {
 456         evlist->mmap[idx].prev = 0;
 457         evlist->mmap[idx].mask = mask;
 458         evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
 459                                       MAP_SHARED, fd, 0);
 460         if (evlist->mmap[idx].base == MAP_FAILED) {
 461                 evlist->mmap[idx].base = NULL;
 462                 return -1;
 463         }
 464
 465         perf_evlist__add_pollfd(evlist, fd);
 466         return 0;
 467 }
 468
 469 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
 470 {
 471         struct perf_evsel *evsel;
 472         int cpu, thread;
 473
 474         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 475                 int output = -1;
 476
 477                 for (thread = 0; thread < evlist->threads->nr; thread++) {
 478                         list_for_each_entry(evsel, &evlist->entries, node) {
 479                                 int fd = FD(evsel, cpu, thread);
 480
 481                                 if (output == -1) {
 482                                         output = fd;
 483                                         if (__perf_evlist__mmap(evlist, cpu,
 484                                                                 prot, mask, output) < 0)
 485                                                 goto out_unmap;
 486                                 } else {
 487                                         if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 488                                                 goto out_unmap;
 489                                 }
 490
 491                                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 492                                     perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
 493                                         goto out_unmap;
 494                         }
 495                 }
 496         }
 497
 498         return 0;
 499
 500 out_unmap:
 501         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 502                 if (evlist->mmap[cpu].base != NULL) {
 503                         munmap(evlist->mmap[cpu].base, evlist->mmap_len);
 504                         evlist->mmap[cpu].base = NULL;
 505                 }
 506         }
 507         return -1;
 508 }
 509
 510 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
 511 {
 512         struct perf_evsel *evsel;
 513         int thread;
 514
 515         for (thread = 0; thread < evlist->threads->nr; thread++) {
 516                 int output = -1;
 517
 518                 list_for_each_entry(evsel, &evlist->entries, node) {
 519                         int fd = FD(evsel, 0, thread);
 520
 521                         if (output == -1) {
 522                                 output = fd;
 523                                 if (__perf_evlist__mmap(evlist, thread,
 524                                                         prot, mask, output) < 0)
 525                                         goto out_unmap;
 526                         } else {
 527                                 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 528                                         goto out_unmap;
 529                         }
 530
 531                         if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 532                             perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
 533                                 goto out_unmap;
 534                 }
 535         }
 536
 537         return 0;
 538
 539 out_unmap:
 540         for (thread = 0; thread < evlist->threads->nr; thread++) {
 541                 if (evlist->mmap[thread].base != NULL) {
 542                         munmap(evlist->mmap[thread].base, evlist->mmap_len);
 543                         evlist->mmap[thread].base = NULL;
 544                 }
 545         }
 546         return -1;
 547 }
 548
 549 /** perf_evlist__mmap - Create per cpu maps to receive events
 550  *
 551  * @evlist - list of events
 552  * @pages - map length in pages
 553  * @overwrite - overwrite older events?
 554  *
 555  * If overwrite is false the user needs to signal event consuption using:
 556  *
 557  *      struct perf_mmap *m = &evlist->mmap[cpu];
 558  *      unsigned int head = perf_mmap__read_head(m);
 559  *
 560  *      perf_mmap__write_tail(m, head)
 561  *
 562  * Using perf_evlist__read_on_cpu does this automatically.
 563  */
 564 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
 565                       bool overwrite)
 566 {
 567         unsigned int page_size = sysconf(_SC_PAGE_SIZE);
 568         struct perf_evsel *evsel;
 569         const struct cpu_map *cpus = evlist->cpus;
 570         const struct thread_map *threads = evlist->threads;
 571         int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
 572
 573         /* 512 kiB: default amount of unprivileged mlocked memory */
 574         if (pages == UINT_MAX)
 575                 pages = (512 * 1024) / page_size;
 576         else if (!is_power_of_2(pages))
 577                 return -EINVAL;
 578
 579         mask = pages * page_size - 1;
 580
 581         if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
 582                 return -ENOMEM;
 583
 584         if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
 585                 return -ENOMEM;
 586
 587         evlist->overwrite = overwrite;
 588         evlist->mmap_len = (pages + 1) * page_size;
 589
 590         list_for_each_entry(evsel, &evlist->entries, node) {
 591                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 592                     evsel->sample_id == NULL &&
 593                     perf_evsel__alloc_id(evsel, cpus->nr, threads->nr) < 0)
 594                         return -ENOMEM;
 595         }
 596
 597         if (evlist->cpus->map[0] == -1)
 598                 return perf_evlist__mmap_per_thread(evlist, prot, mask);
 599
 600         return perf_evlist__mmap_per_cpu(evlist, prot, mask);
 601 }
 602
 603 int perf_evlist__create_maps(struct perf_evlist *evlist,
 604                              struct perf_target *target)
 605 {
 606         evlist->threads = thread_map__new_str(target->pid, target->tid,
 607                                               target->uid);
 608
 609         if (evlist->threads == NULL)
 610                 return -1;
 611
 612         if (perf_target__has_task(target))
 613                 evlist->cpus = cpu_map__dummy_new();
 614         else if (!perf_target__has_cpu(target) && !target->uses_mmap)
 615                 evlist->cpus = cpu_map__dummy_new();
 616         else
 617                 evlist->cpus = cpu_map__new(target->cpu_list);
 618
 619         if (evlist->cpus == NULL)
 620                 goto out_delete_threads;
 621
 622         return 0;
 623
 624 out_delete_threads:
 625         thread_map__delete(evlist->threads);
 626         return -1;
 627 }
 628
 629 void perf_evlist__delete_maps(struct perf_evlist *evlist)
 630 {
 631         cpu_map__delete(evlist->cpus);
 632         thread_map__delete(evlist->threads);
 633         evlist->cpus    = NULL;
 634         evlist->threads = NULL;
 635 }
 636
 637 int perf_evlist__set_filters(struct perf_evlist *evlist)
 638 {
 639         const struct thread_map *threads = evlist->threads;
 640         const struct cpu_map *cpus = evlist->cpus;
 641         struct perf_evsel *evsel;
 642         char *filter;
 643         int thread;
 644         int cpu;
 645         int err;
 646         int fd;
 647
 648         list_for_each_entry(evsel, &evlist->entries, node) {
 649                 filter = evsel->filter;
 650                 if (!filter)
 651                         continue;
 652                 for (cpu = 0; cpu < cpus->nr; cpu++) {
 653                         for (thread = 0; thread < threads->nr; thread++) {
 654                                 fd = FD(evsel, cpu, thread);
 655                                 err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter);
 656                                 if (err)
 657                                         return err;
 658                         }
 659                 }
 660         }
 661
 662         return 0;
 663 }
 664
 665 bool perf_evlist__valid_sample_type(const struct perf_evlist *evlist)
 666 {
 667         struct perf_evsel *pos, *first;
 668
 669         pos = first = list_entry(evlist->entries.next, struct perf_evsel, node);
 670
 671         list_for_each_entry_continue(pos, &evlist->entries, node) {
 672                 if (first->attr.sample_type != pos->attr.sample_type)
 673                         return false;
 674         }
 675
 676         return true;
 677 }
 678
 679 u64 perf_evlist__sample_type(const struct perf_evlist *evlist)
 680 {
 681         struct perf_evsel *first;
 682
 683         first = list_entry(evlist->entries.next, struct perf_evsel, node);
 684         return first->attr.sample_type;
 685 }
 686
 687 u16 perf_evlist__id_hdr_size(const struct perf_evlist *evlist)
 688 {
 689         struct perf_evsel *first;
 690         struct perf_sample *data;
 691         u64 sample_type;
 692         u16 size = 0;
 693
 694         first = list_entry(evlist->entries.next, struct perf_evsel, node);
 695
 696         if (!first->attr.sample_id_all)
 697                 goto out;
 698
 699         sample_type = first->attr.sample_type;
 700
 701         if (sample_type & PERF_SAMPLE_TID)
 702                 size += sizeof(data->tid) * 2;
 703
 704        if (sample_type & PERF_SAMPLE_TIME)
 705                 size += sizeof(data->time);
 706
 707         if (sample_type & PERF_SAMPLE_ID)
 708                 size += sizeof(data->id);
 709
 710         if (sample_type & PERF_SAMPLE_STREAM_ID)
 711                 size += sizeof(data->stream_id);
 712
 713         if (sample_type & PERF_SAMPLE_CPU)
 714                 size += sizeof(data->cpu) * 2;
 715 out:
 716         return size;
 717 }
 718
 719 bool perf_evlist__valid_sample_id_all(const struct perf_evlist *evlist)
 720 {
 721         struct perf_evsel *pos, *first;
 722
 723         pos = first = list_entry(evlist->entries.next, struct perf_evsel, node);
 724
 725         list_for_each_entry_continue(pos, &evlist->entries, node) {
 726                 if (first->attr.sample_id_all != pos->attr.sample_id_all)
 727                         return false;
 728         }
 729
 730         return true;
 731 }
 732
 733 bool perf_evlist__sample_id_all(const struct perf_evlist *evlist)
 734 {
 735         struct perf_evsel *first;
 736
 737         first = list_entry(evlist->entries.next, struct perf_evsel, node);
 738         return first->attr.sample_id_all;
 739 }
 740
 741 void perf_evlist__set_selected(struct perf_evlist *evlist,
 742                                struct perf_evsel *evsel)
 743 {
 744         evlist->selected = evsel;
 745 }
 746
 747 int perf_evlist__open(struct perf_evlist *evlist, bool group)
 748 {
 749         struct perf_evsel *evsel, *first;
 750         int err, ncpus, nthreads;
 751
 752         first = list_entry(evlist->entries.next, struct perf_evsel, node);
 753
 754         list_for_each_entry(evsel, &evlist->entries, node) {
 755                 struct xyarray *group_fd = NULL;
 756
 757                 if (group && evsel != first)
 758                         group_fd = first->fd;
 759
 760                 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads,
 761                                        group, group_fd);
 762                 if (err < 0)
 763                         goto out_err;
 764         }
 765
 766         return 0;
 767 out_err:
 768         ncpus = evlist->cpus ? evlist->cpus->nr : 1;
 769         nthreads = evlist->threads ? evlist->threads->nr : 1;
 770
 771         list_for_each_entry_reverse(evsel, &evlist->entries, node)
 772                 perf_evsel__close(evsel, ncpus, nthreads);
 773
 774         errno = -err;
 775         return err;
 776 }
 777
 778 int perf_evlist__prepare_workload(struct perf_evlist *evlist,
 779                                   struct perf_record_opts *opts,
 780                                   const char *argv[])
 781 {
 782         int child_ready_pipe[2], go_pipe[2];
 783         char bf;
 784
 785         if (pipe(child_ready_pipe) < 0) {
 786                 perror("failed to create 'ready' pipe");
 787                 return -1;
 788         }
 789
 790         if (pipe(go_pipe) < 0) {
 791                 perror("failed to create 'go' pipe");
 792                 goto out_close_ready_pipe;
 793         }
 794
 795         evlist->workload.pid = fork();
 796         if (evlist->workload.pid < 0) {
 797                 perror("failed to fork");
 798                 goto out_close_pipes;
 799         }
 800
 801         if (!evlist->workload.pid) {
 802                 if (opts->pipe_output)
 803                         dup2(2, 1);
 804
 805                 close(child_ready_pipe[0]);
 806                 close(go_pipe[1]);
 807                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 808
 809                 /*
 810                  * Do a dummy execvp to get the PLT entry resolved,
 811                  * so we avoid the resolver overhead on the real
 812                  * execvp call.
 813                  */
 814                 execvp("", (char **)argv);
 815
 816                 /*
 817                  * Tell the parent we're ready to go
 818                  */
 819                 close(child_ready_pipe[1]);
 820
 821                 /*
 822                  * Wait until the parent tells us to go.
 823                  */
 824                 if (read(go_pipe[0], &bf, 1) == -1)
 825                         perror("unable to read pipe");
 826
 827                 execvp(argv[0], (char **)argv);
 828
 829                 perror(argv[0]);
 830                 kill(getppid(), SIGUSR1);
 831                 exit(-1);
 832         }
 833
 834         if (perf_target__none(&opts->target))
 835                 evlist->threads->map[0] = evlist->workload.pid;
 836
 837         close(child_ready_pipe[1]);
 838         close(go_pipe[0]);
 839         /*
 840          * wait for child to settle
 841          */
 842         if (read(child_ready_pipe[0], &bf, 1) == -1) {
 843                 perror("unable to read pipe");
 844                 goto out_close_pipes;
 845         }
 846
 847         evlist->workload.cork_fd = go_pipe[1];
 848         close(child_ready_pipe[0]);
 849         return 0;
 850
 851 out_close_pipes:
 852         close(go_pipe[0]);
 853         close(go_pipe[1]);
 854 out_close_ready_pipe:
 855         close(child_ready_pipe[0]);
 856         close(child_ready_pipe[1]);
 857         return -1;
 858 }
 859
 860 int perf_evlist__start_workload(struct perf_evlist *evlist)
 861 {
 862         if (evlist->workload.cork_fd > 0) {
 863                 /*
 864                  * Remove the cork, let it rip!
 865                  */
 866                 return close(evlist->workload.cork_fd);
 867         }
 868
 869         return 0;
 870 }