tools/perf/builtin-record.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * builtin-record.c
   4  *
   5  * Builtin record command: Record the profile of a workload
   6  * (or a CPU, or a PID) into the perf.data output file - for
   7  * later analysis via perf report.
   8  */
   9 #include "builtin.h"
  10
  11 #include "util/build-id.h"
  12 #include <subcmd/parse-options.h>
  13 #include "util/parse-events.h"
  14 #include "util/config.h"
  15
  16 #include "util/callchain.h"
  17 #include "util/cgroup.h"
  18 #include "util/header.h"
  19 #include "util/event.h"
  20 #include "util/evlist.h"
  21 #include "util/evsel.h"
  22 #include "util/debug.h"
  23 #include "util/mmap.h"
  24 #include "util/target.h"
  25 #include "util/session.h"
  26 #include "util/tool.h"
  27 #include "util/symbol.h"
  28 #include "util/record.h"
  29 #include "util/cpumap.h"
  30 #include "util/thread_map.h"
  31 #include "util/data.h"
  32 #include "util/perf_regs.h"
  33 #include "util/auxtrace.h"
  34 #include "util/tsc.h"
  35 #include "util/parse-branch-options.h"
  36 #include "util/parse-regs-options.h"
  37 #include "util/perf_api_probe.h"
  38 #include "util/llvm-utils.h"
  39 #include "util/bpf-loader.h"
  40 #include "util/trigger.h"
  41 #include "util/perf-hooks.h"
  42 #include "util/cpu-set-sched.h"
  43 #include "util/synthetic-events.h"
  44 #include "util/time-utils.h"
  45 #include "util/units.h"
  46 #include "util/bpf-event.h"
  47 #include "util/util.h"
  48 #include "util/pfm.h"
  49 #include "util/clockid.h"
  50 #include "asm/bug.h"
  51 #include "perf.h"
  52
  53 #include <errno.h>
  54 #include <inttypes.h>
  55 #include <locale.h>
  56 #include <poll.h>
  57 #include <pthread.h>
  58 #include <unistd.h>
  59 #include <sched.h>
  60 #include <signal.h>
  61 #ifdef HAVE_EVENTFD_SUPPORT
  62 #include <sys/eventfd.h>
  63 #endif
  64 #include <sys/mman.h>
  65 #include <sys/wait.h>
  66 #include <sys/types.h>
  67 #include <sys/stat.h>
  68 #include <fcntl.h>
  69 #include <linux/err.h>
  70 #include <linux/string.h>
  71 #include <linux/time64.h>
  72 #include <linux/zalloc.h>
  73 #include <linux/bitmap.h>
  74 #include <sys/time.h>
  75
  76 struct switch_output {
  77         bool             enabled;
  78         bool             signal;
  79         unsigned long    size;
  80         unsigned long    time;
  81         const char      *str;
  82         bool             set;
  83         char             **filenames;
  84         int              num_files;
  85         int              cur_file;
  86 };
  87
  88 struct record {
  89         struct perf_tool        tool;
  90         struct record_opts      opts;
  91         u64                     bytes_written;
  92         struct perf_data        data;
  93         struct auxtrace_record  *itr;
  94         struct evlist   *evlist;
  95         struct perf_session     *session;
  96         struct evlist           *sb_evlist;
  97         pthread_t               thread_id;
  98         int                     realtime_prio;
  99         bool                    switch_output_event_set;
 100         bool                    no_buildid;
 101         bool                    no_buildid_set;
 102         bool                    no_buildid_cache;
 103         bool                    no_buildid_cache_set;
 104         bool                    buildid_all;
 105         bool                    timestamp_filename;
 106         bool                    timestamp_boundary;
 107         struct switch_output    switch_output;
 108         unsigned long long      samples;
 109         struct mmap_cpu_mask    affinity_mask;
 110         unsigned long           output_max_size;        /* = 0: unlimited */
 111 };
 112
 113 static volatile int done;
 114
 115 static volatile int auxtrace_record__snapshot_started;
 116 static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
 117 static DEFINE_TRIGGER(switch_output_trigger);
 118
 119 static const char *affinity_tags[PERF_AFFINITY_MAX] = {
 120         "SYS", "NODE", "CPU"
 121 };
 122
 123 static bool switch_output_signal(struct record *rec)
 124 {
 125         return rec->switch_output.signal &&
 126                trigger_is_ready(&switch_output_trigger);
 127 }
 128
 129 static bool switch_output_size(struct record *rec)
 130 {
 131         return rec->switch_output.size &&
 132                trigger_is_ready(&switch_output_trigger) &&
 133                (rec->bytes_written >= rec->switch_output.size);
 134 }
 135
 136 static bool switch_output_time(struct record *rec)
 137 {
 138         return rec->switch_output.time &&
 139                trigger_is_ready(&switch_output_trigger);
 140 }
 141
 142 static bool record__output_max_size_exceeded(struct record *rec)
 143 {
 144         return rec->output_max_size &&
 145                (rec->bytes_written >= rec->output_max_size);
 146 }
 147
 148 static int record__write(struct record *rec, struct mmap *map __maybe_unused,
 149                          void *bf, size_t size)
 150 {
 151         struct perf_data_file *file = &rec->session->data->file;
 152
 153         if (perf_data_file__write(file, bf, size) < 0) {
 154                 pr_err("failed to write perf data, error: %m\n");
 155                 return -1;
 156         }
 157
 158         rec->bytes_written += size;
 159
 160         if (record__output_max_size_exceeded(rec) && !done) {
 161                 fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB),"
 162                                 " stopping session ]\n",
 163                                 rec->bytes_written >> 10);
 164                 done = 1;
 165         }
 166
 167         if (switch_output_size(rec))
 168                 trigger_hit(&switch_output_trigger);
 169
 170         return 0;
 171 }
 172
 173 static int record__aio_enabled(struct record *rec);
 174 static int record__comp_enabled(struct record *rec);
 175 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
 176                             void *src, size_t src_size);
 177
 178 #ifdef HAVE_AIO_SUPPORT
 179 static int record__aio_write(struct aiocb *cblock, int trace_fd,
 180                 void *buf, size_t size, off_t off)
 181 {
 182         int rc;
 183
 184         cblock->aio_fildes = trace_fd;
 185         cblock->aio_buf    = buf;
 186         cblock->aio_nbytes = size;
 187         cblock->aio_offset = off;
 188         cblock->aio_sigevent.sigev_notify = SIGEV_NONE;
 189
 190         do {
 191                 rc = aio_write(cblock);
 192                 if (rc == 0) {
 193                         break;
 194                 } else if (errno != EAGAIN) {
 195                         cblock->aio_fildes = -1;
 196                         pr_err("failed to queue perf data, error: %m\n");
 197                         break;
 198                 }
 199         } while (1);
 200
 201         return rc;
 202 }
 203
 204 static int record__aio_complete(struct mmap *md, struct aiocb *cblock)
 205 {
 206         void *rem_buf;
 207         off_t rem_off;
 208         size_t rem_size;
 209         int rc, aio_errno;
 210         ssize_t aio_ret, written;
 211
 212         aio_errno = aio_error(cblock);
 213         if (aio_errno == EINPROGRESS)
 214                 return 0;
 215
 216         written = aio_ret = aio_return(cblock);
 217         if (aio_ret < 0) {
 218                 if (aio_errno != EINTR)
 219                         pr_err("failed to write perf data, error: %m\n");
 220                 written = 0;
 221         }
 222
 223         rem_size = cblock->aio_nbytes - written;
 224
 225         if (rem_size == 0) {
 226                 cblock->aio_fildes = -1;
 227                 /*
 228                  * md->refcount is incremented in record__aio_pushfn() for
 229                  * every aio write request started in record__aio_push() so
 230                  * decrement it because the request is now complete.
 231                  */
 232                 perf_mmap__put(&md->core);
 233                 rc = 1;
 234         } else {
 235                 /*
 236                  * aio write request may require restart with the
 237                  * reminder if the kernel didn't write whole
 238                  * chunk at once.
 239                  */
 240                 rem_off = cblock->aio_offset + written;
 241                 rem_buf = (void *)(cblock->aio_buf + written);
 242                 record__aio_write(cblock, cblock->aio_fildes,
 243                                 rem_buf, rem_size, rem_off);
 244                 rc = 0;
 245         }
 246
 247         return rc;
 248 }
 249
 250 static int record__aio_sync(struct mmap *md, bool sync_all)
 251 {
 252         struct aiocb **aiocb = md->aio.aiocb;
 253         struct aiocb *cblocks = md->aio.cblocks;
 254         struct timespec timeout = { 0, 1000 * 1000  * 1 }; /* 1ms */
 255         int i, do_suspend;
 256
 257         do {
 258                 do_suspend = 0;
 259                 for (i = 0; i < md->aio.nr_cblocks; ++i) {
 260                         if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) {
 261                                 if (sync_all)
 262                                         aiocb[i] = NULL;
 263                                 else
 264                                         return i;
 265                         } else {
 266                                 /*
 267                                  * Started aio write is not complete yet
 268                                  * so it has to be waited before the
 269                                  * next allocation.
 270                                  */
 271                                 aiocb[i] = &cblocks[i];
 272                                 do_suspend = 1;
 273                         }
 274                 }
 275                 if (!do_suspend)
 276                         return -1;
 277
 278                 while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) {
 279                         if (!(errno == EAGAIN || errno == EINTR))
 280                                 pr_err("failed to sync perf data, error: %m\n");
 281                 }
 282         } while (1);
 283 }
 284
 285 struct record_aio {
 286         struct record   *rec;
 287         void            *data;
 288         size_t          size;
 289 };
 290
 291 static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size)
 292 {
 293         struct record_aio *aio = to;
 294
 295         /*
 296          * map->core.base data pointed by buf is copied into free map->aio.data[] buffer
 297          * to release space in the kernel buffer as fast as possible, calling
 298          * perf_mmap__consume() from perf_mmap__push() function.
 299          *
 300          * That lets the kernel to proceed with storing more profiling data into
 301          * the kernel buffer earlier than other per-cpu kernel buffers are handled.
 302          *
 303          * Coping can be done in two steps in case the chunk of profiling data
 304          * crosses the upper bound of the kernel buffer. In this case we first move
 305          * part of data from map->start till the upper bound and then the reminder
 306          * from the beginning of the kernel buffer till the end of the data chunk.
 307          */
 308
 309         if (record__comp_enabled(aio->rec)) {
 310                 size = zstd_compress(aio->rec->session, aio->data + aio->size,
 311                                      mmap__mmap_len(map) - aio->size,
 312                                      buf, size);
 313         } else {
 314                 memcpy(aio->data + aio->size, buf, size);
 315         }
 316
 317         if (!aio->size) {
 318                 /*
 319                  * Increment map->refcount to guard map->aio.data[] buffer
 320                  * from premature deallocation because map object can be
 321                  * released earlier than aio write request started on
 322                  * map->aio.data[] buffer is complete.
 323                  *
 324                  * perf_mmap__put() is done at record__aio_complete()
 325                  * after started aio request completion or at record__aio_push()
 326                  * if the request failed to start.
 327                  */
 328                 perf_mmap__get(&map->core);
 329         }
 330
 331         aio->size += size;
 332
 333         return size;
 334 }
 335
 336 static int record__aio_push(struct record *rec, struct mmap *map, off_t *off)
 337 {
 338         int ret, idx;
 339         int trace_fd = rec->session->data->file.fd;
 340         struct record_aio aio = { .rec = rec, .size = 0 };
 341
 342         /*
 343          * Call record__aio_sync() to wait till map->aio.data[] buffer
 344          * becomes available after previous aio write operation.
 345          */
 346
 347         idx = record__aio_sync(map, false);
 348         aio.data = map->aio.data[idx];
 349         ret = perf_mmap__push(map, &aio, record__aio_pushfn);
 350         if (ret != 0) /* ret > 0 - no data, ret < 0 - error */
 351                 return ret;
 352
 353         rec->samples++;
 354         ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off);
 355         if (!ret) {
 356                 *off += aio.size;
 357                 rec->bytes_written += aio.size;
 358                 if (switch_output_size(rec))
 359                         trigger_hit(&switch_output_trigger);
 360         } else {
 361                 /*
 362                  * Decrement map->refcount incremented in record__aio_pushfn()
 363                  * back if record__aio_write() operation failed to start, otherwise
 364                  * map->refcount is decremented in record__aio_complete() after
 365                  * aio write operation finishes successfully.
 366                  */
 367                 perf_mmap__put(&map->core);
 368         }
 369
 370         return ret;
 371 }
 372
 373 static off_t record__aio_get_pos(int trace_fd)
 374 {
 375         return lseek(trace_fd, 0, SEEK_CUR);
 376 }
 377
 378 static void record__aio_set_pos(int trace_fd, off_t pos)
 379 {
 380         lseek(trace_fd, pos, SEEK_SET);
 381 }
 382
 383 static void record__aio_mmap_read_sync(struct record *rec)
 384 {
 385         int i;
 386         struct evlist *evlist = rec->evlist;
 387         struct mmap *maps = evlist->mmap;
 388
 389         if (!record__aio_enabled(rec))
 390                 return;
 391
 392         for (i = 0; i < evlist->core.nr_mmaps; i++) {
 393                 struct mmap *map = &maps[i];
 394
 395                 if (map->core.base)
 396                         record__aio_sync(map, true);
 397         }
 398 }
 399
 400 static int nr_cblocks_default = 1;
 401 static int nr_cblocks_max = 4;
 402
 403 static int record__aio_parse(const struct option *opt,
 404                              const char *str,
 405                              int unset)
 406 {
 407         struct record_opts *opts = (struct record_opts *)opt->value;
 408
 409         if (unset) {
 410                 opts->nr_cblocks = 0;
 411         } else {
 412                 if (str)
 413                         opts->nr_cblocks = strtol(str, NULL, 0);
 414                 if (!opts->nr_cblocks)
 415                         opts->nr_cblocks = nr_cblocks_default;
 416         }
 417
 418         return 0;
 419 }
 420 #else /* HAVE_AIO_SUPPORT */
 421 static int nr_cblocks_max = 0;
 422
 423 static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused,
 424                             off_t *off __maybe_unused)
 425 {
 426         return -1;
 427 }
 428
 429 static off_t record__aio_get_pos(int trace_fd __maybe_unused)
 430 {
 431         return -1;
 432 }
 433
 434 static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused)
 435 {
 436 }
 437
 438 static void record__aio_mmap_read_sync(struct record *rec __maybe_unused)
 439 {
 440 }
 441 #endif
 442
 443 static int record__aio_enabled(struct record *rec)
 444 {
 445         return rec->opts.nr_cblocks > 0;
 446 }
 447
 448 #define MMAP_FLUSH_DEFAULT 1
 449 static int record__mmap_flush_parse(const struct option *opt,
 450                                     const char *str,
 451                                     int unset)
 452 {
 453         int flush_max;
 454         struct record_opts *opts = (struct record_opts *)opt->value;
 455         static struct parse_tag tags[] = {
 456                         { .tag  = 'B', .mult = 1       },
 457                         { .tag  = 'K', .mult = 1 << 10 },
 458                         { .tag  = 'M', .mult = 1 << 20 },
 459                         { .tag  = 'G', .mult = 1 << 30 },
 460                         { .tag  = 0 },
 461         };
 462
 463         if (unset)
 464                 return 0;
 465
 466         if (str) {
 467                 opts->mmap_flush = parse_tag_value(str, tags);
 468                 if (opts->mmap_flush == (int)-1)
 469                         opts->mmap_flush = strtol(str, NULL, 0);
 470         }
 471
 472         if (!opts->mmap_flush)
 473                 opts->mmap_flush = MMAP_FLUSH_DEFAULT;
 474
 475         flush_max = evlist__mmap_size(opts->mmap_pages);
 476         flush_max /= 4;
 477         if (opts->mmap_flush > flush_max)
 478                 opts->mmap_flush = flush_max;
 479
 480         return 0;
 481 }
 482
 483 #ifdef HAVE_ZSTD_SUPPORT
 484 static unsigned int comp_level_default = 1;
 485
 486 static int record__parse_comp_level(const struct option *opt, const char *str, int unset)
 487 {
 488         struct record_opts *opts = opt->value;
 489
 490         if (unset) {
 491                 opts->comp_level = 0;
 492         } else {
 493                 if (str)
 494                         opts->comp_level = strtol(str, NULL, 0);
 495                 if (!opts->comp_level)
 496                         opts->comp_level = comp_level_default;
 497         }
 498
 499         return 0;
 500 }
 501 #endif
 502 static unsigned int comp_level_max = 22;
 503
 504 static int record__comp_enabled(struct record *rec)
 505 {
 506         return rec->opts.comp_level > 0;
 507 }
 508
 509 static int process_synthesized_event(struct perf_tool *tool,
 510                                      union perf_event *event,
 511                                      struct perf_sample *sample __maybe_unused,
 512                                      struct machine *machine __maybe_unused)
 513 {
 514         struct record *rec = container_of(tool, struct record, tool);
 515         return record__write(rec, NULL, event, event->header.size);
 516 }
 517
 518 static int process_locked_synthesized_event(struct perf_tool *tool,
 519                                      union perf_event *event,
 520                                      struct perf_sample *sample __maybe_unused,
 521                                      struct machine *machine __maybe_unused)
 522 {
 523         static pthread_mutex_t synth_lock = PTHREAD_MUTEX_INITIALIZER;
 524         int ret;
 525
 526         pthread_mutex_lock(&synth_lock);
 527         ret = process_synthesized_event(tool, event, sample, machine);
 528         pthread_mutex_unlock(&synth_lock);
 529         return ret;
 530 }
 531
 532 static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
 533 {
 534         struct record *rec = to;
 535
 536         if (record__comp_enabled(rec)) {
 537                 size = zstd_compress(rec->session, map->data, mmap__mmap_len(map), bf, size);
 538                 bf   = map->data;
 539         }
 540
 541         rec->samples++;
 542         return record__write(rec, map, bf, size);
 543 }
 544
 545 static volatile int signr = -1;
 546 static volatile int child_finished;
 547 #ifdef HAVE_EVENTFD_SUPPORT
 548 static int done_fd = -1;
 549 #endif
 550
 551 static void sig_handler(int sig)
 552 {
 553         if (sig == SIGCHLD)
 554                 child_finished = 1;
 555         else
 556                 signr = sig;
 557
 558         done = 1;
 559 #ifdef HAVE_EVENTFD_SUPPORT
 560 {
 561         u64 tmp = 1;
 562         /*
 563          * It is possible for this signal handler to run after done is checked
 564          * in the main loop, but before the perf counter fds are polled. If this
 565          * happens, the poll() will continue to wait even though done is set,
 566          * and will only break out if either another signal is received, or the
 567          * counters are ready for read. To ensure the poll() doesn't sleep when
 568          * done is set, use an eventfd (done_fd) to wake up the poll().
 569          */
 570         if (write(done_fd, &tmp, sizeof(tmp)) < 0)
 571                 pr_err("failed to signal wakeup fd, error: %m\n");
 572 }
 573 #endif // HAVE_EVENTFD_SUPPORT
 574 }
 575
 576 static void sigsegv_handler(int sig)
 577 {
 578         perf_hooks__recover();
 579         sighandler_dump_stack(sig);
 580 }
 581
 582 static void record__sig_exit(void)
 583 {
 584         if (signr == -1)
 585                 return;
 586
 587         signal(signr, SIG_DFL);
 588         raise(signr);
 589 }
 590
 591 #ifdef HAVE_AUXTRACE_SUPPORT
 592
 593 static int record__process_auxtrace(struct perf_tool *tool,
 594                                     struct mmap *map,
 595                                     union perf_event *event, void *data1,
 596                                     size_t len1, void *data2, size_t len2)
 597 {
 598         struct record *rec = container_of(tool, struct record, tool);
 599         struct perf_data *data = &rec->data;
 600         size_t padding;
 601         u8 pad[8] = {0};
 602
 603         if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) {
 604                 off_t file_offset;
 605                 int fd = perf_data__fd(data);
 606                 int err;
 607
 608                 file_offset = lseek(fd, 0, SEEK_CUR);
 609                 if (file_offset == -1)
 610                         return -1;
 611                 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
 612                                                      event, file_offset);
 613                 if (err)
 614                         return err;
 615         }
 616
 617         /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
 618         padding = (len1 + len2) & 7;
 619         if (padding)
 620                 padding = 8 - padding;
 621
 622         record__write(rec, map, event, event->header.size);
 623         record__write(rec, map, data1, len1);
 624         if (len2)
 625                 record__write(rec, map, data2, len2);
 626         record__write(rec, map, &pad, padding);
 627
 628         return 0;
 629 }
 630
 631 static int record__auxtrace_mmap_read(struct record *rec,
 632                                       struct mmap *map)
 633 {
 634         int ret;
 635
 636         ret = auxtrace_mmap__read(map, rec->itr, &rec->tool,
 637                                   record__process_auxtrace);
 638         if (ret < 0)
 639                 return ret;
 640
 641         if (ret)
 642                 rec->samples++;
 643
 644         return 0;
 645 }
 646
 647 static int record__auxtrace_mmap_read_snapshot(struct record *rec,
 648                                                struct mmap *map)
 649 {
 650         int ret;
 651
 652         ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool,
 653                                            record__process_auxtrace,
 654                                            rec->opts.auxtrace_snapshot_size);
 655         if (ret < 0)
 656                 return ret;
 657
 658         if (ret)
 659                 rec->samples++;
 660
 661         return 0;
 662 }
 663
 664 static int record__auxtrace_read_snapshot_all(struct record *rec)
 665 {
 666         int i;
 667         int rc = 0;
 668
 669         for (i = 0; i < rec->evlist->core.nr_mmaps; i++) {
 670                 struct mmap *map = &rec->evlist->mmap[i];
 671
 672                 if (!map->auxtrace_mmap.base)
 673                         continue;
 674
 675                 if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) {
 676                         rc = -1;
 677                         goto out;
 678                 }
 679         }
 680 out:
 681         return rc;
 682 }
 683
 684 static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit)
 685 {
 686         pr_debug("Recording AUX area tracing snapshot\n");
 687         if (record__auxtrace_read_snapshot_all(rec) < 0) {
 688                 trigger_error(&auxtrace_snapshot_trigger);
 689         } else {
 690                 if (auxtrace_record__snapshot_finish(rec->itr, on_exit))
 691                         trigger_error(&auxtrace_snapshot_trigger);
 692                 else
 693                         trigger_ready(&auxtrace_snapshot_trigger);
 694         }
 695 }
 696
 697 static int record__auxtrace_snapshot_exit(struct record *rec)
 698 {
 699         if (trigger_is_error(&auxtrace_snapshot_trigger))
 700                 return 0;
 701
 702         if (!auxtrace_record__snapshot_started &&
 703             auxtrace_record__snapshot_start(rec->itr))
 704                 return -1;
 705
 706         record__read_auxtrace_snapshot(rec, true);
 707         if (trigger_is_error(&auxtrace_snapshot_trigger))
 708                 return -1;
 709
 710         return 0;
 711 }
 712
 713 static int record__auxtrace_init(struct record *rec)
 714 {
 715         int err;
 716
 717         if (!rec->itr) {
 718                 rec->itr = auxtrace_record__init(rec->evlist, &err);
 719                 if (err)
 720                         return err;
 721         }
 722
 723         err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
 724                                               rec->opts.auxtrace_snapshot_opts);
 725         if (err)
 726                 return err;
 727
 728         err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts,
 729                                             rec->opts.auxtrace_sample_opts);
 730         if (err)
 731                 return err;
 732
 733         return auxtrace_parse_filters(rec->evlist);
 734 }
 735
 736 #else
 737
 738 static inline
 739 int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
 740                                struct mmap *map __maybe_unused)
 741 {
 742         return 0;
 743 }
 744
 745 static inline
 746 void record__read_auxtrace_snapshot(struct record *rec __maybe_unused,
 747                                     bool on_exit __maybe_unused)
 748 {
 749 }
 750
 751 static inline
 752 int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
 753 {
 754         return 0;
 755 }
 756
 757 static inline
 758 int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused)
 759 {
 760         return 0;
 761 }
 762
 763 static int record__auxtrace_init(struct record *rec __maybe_unused)
 764 {
 765         return 0;
 766 }
 767
 768 #endif
 769
 770 static int record__config_text_poke(struct evlist *evlist)
 771 {
 772         struct evsel *evsel;
 773         int err;
 774
 775         /* Nothing to do if text poke is already configured */
 776         evlist__for_each_entry(evlist, evsel) {
 777                 if (evsel->core.attr.text_poke)
 778                         return 0;
 779         }
 780
 781         err = parse_events(evlist, "dummy:u", NULL);
 782         if (err)
 783                 return err;
 784
 785         evsel = evlist__last(evlist);
 786
 787         evsel->core.attr.freq = 0;
 788         evsel->core.attr.sample_period = 1;
 789         evsel->core.attr.text_poke = 1;
 790         evsel->core.attr.ksymbol = 1;
 791
 792         evsel->core.system_wide = true;
 793         evsel->no_aux_samples = true;
 794         evsel->immediate = true;
 795
 796         /* Text poke must be collected on all CPUs */
 797         perf_cpu_map__put(evsel->core.own_cpus);
 798         evsel->core.own_cpus = perf_cpu_map__new(NULL);
 799         perf_cpu_map__put(evsel->core.cpus);
 800         evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus);
 801
 802         evsel__set_sample_bit(evsel, TIME);
 803
 804         return 0;
 805 }
 806
 807 static bool record__kcore_readable(struct machine *machine)
 808 {
 809         char kcore[PATH_MAX];
 810         int fd;
 811
 812         scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir);
 813
 814         fd = open(kcore, O_RDONLY);
 815         if (fd < 0)
 816                 return false;
 817
 818         close(fd);
 819
 820         return true;
 821 }
 822
 823 static int record__kcore_copy(struct machine *machine, struct perf_data *data)
 824 {
 825         char from_dir[PATH_MAX];
 826         char kcore_dir[PATH_MAX];
 827         int ret;
 828
 829         snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir);
 830
 831         ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir));
 832         if (ret)
 833                 return ret;
 834
 835         return kcore_copy(from_dir, kcore_dir);
 836 }
 837
 838 static int record__mmap_evlist(struct record *rec,
 839                                struct evlist *evlist)
 840 {
 841         struct record_opts *opts = &rec->opts;
 842         bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
 843                                   opts->auxtrace_sample_mode;
 844         char msg[512];
 845
 846         if (opts->affinity != PERF_AFFINITY_SYS)
 847                 cpu__setup_cpunode_map();
 848
 849         if (evlist__mmap_ex(evlist, opts->mmap_pages,
 850                                  opts->auxtrace_mmap_pages,
 851                                  auxtrace_overwrite,
 852                                  opts->nr_cblocks, opts->affinity,
 853                                  opts->mmap_flush, opts->comp_level) < 0) {
 854                 if (errno == EPERM) {
 855                         pr_err("Permission error mapping pages.\n"
 856                                "Consider increasing "
 857                                "/proc/sys/kernel/perf_event_mlock_kb,\n"
 858                                "or try again with a smaller value of -m/--mmap_pages.\n"
 859                                "(current value: %u,%u)\n",
 860                                opts->mmap_pages, opts->auxtrace_mmap_pages);
 861                         return -errno;
 862                 } else {
 863                         pr_err("failed to mmap with %d (%s)\n", errno,
 864                                 str_error_r(errno, msg, sizeof(msg)));
 865                         if (errno)
 866                                 return -errno;
 867                         else
 868                                 return -EINVAL;
 869                 }
 870         }
 871         return 0;
 872 }
 873
 874 static int record__mmap(struct record *rec)
 875 {
 876         return record__mmap_evlist(rec, rec->evlist);
 877 }
 878
 879 static int record__open(struct record *rec)
 880 {
 881         char msg[BUFSIZ];
 882         struct evsel *pos;
 883         struct evlist *evlist = rec->evlist;
 884         struct perf_session *session = rec->session;
 885         struct record_opts *opts = &rec->opts;
 886         int rc = 0;
 887
 888         /*
 889          * For initial_delay or system wide, we need to add a dummy event so
 890          * that we can track PERF_RECORD_MMAP to cover the delay of waiting or
 891          * event synthesis.
 892          */
 893         if (opts->initial_delay || target__has_cpu(&opts->target)) {
 894                 pos = perf_evlist__get_tracking_event(evlist);
 895                 if (!evsel__is_dummy_event(pos)) {
 896                         /* Set up dummy event. */
 897                         if (evlist__add_dummy(evlist))
 898                                 return -ENOMEM;
 899                         pos = evlist__last(evlist);
 900                         perf_evlist__set_tracking_event(evlist, pos);
 901                 }
 902
 903                 /*
 904                  * Enable the dummy event when the process is forked for
 905                  * initial_delay, immediately for system wide.
 906                  */
 907                 if (opts->initial_delay && !pos->immediate)
 908                         pos->core.attr.enable_on_exec = 1;
 909                 else
 910                         pos->immediate = 1;
 911         }
 912
 913         perf_evlist__config(evlist, opts, &callchain_param);
 914
 915         evlist__for_each_entry(evlist, pos) {
 916 try_again:
 917                 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) {
 918                         if (evsel__fallback(pos, errno, msg, sizeof(msg))) {
 919                                 if (verbose > 0)
 920                                         ui__warning("%s\n", msg);
 921                                 goto try_again;
 922                         }
 923                         if ((errno == EINVAL || errno == EBADF) &&
 924                             pos->leader != pos &&
 925                             pos->weak_group) {
 926                                 pos = perf_evlist__reset_weak_group(evlist, pos, true);
 927                                 goto try_again;
 928                         }
 929                         rc = -errno;
 930                         evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg));
 931                         ui__error("%s\n", msg);
 932                         goto out;
 933                 }
 934
 935                 pos->supported = true;
 936         }
 937
 938         if (symbol_conf.kptr_restrict && !perf_evlist__exclude_kernel(evlist)) {
 939                 pr_warning(
 940 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
 941 "check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
 942 "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
 943 "file is not found in the buildid cache or in the vmlinux path.\n\n"
 944 "Samples in kernel modules won't be resolved at all.\n\n"
 945 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
 946 "even with a suitable vmlinux or kallsyms file.\n\n");
 947         }
 948
 949         if (perf_evlist__apply_filters(evlist, &pos)) {
 950                 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
 951                         pos->filter, evsel__name(pos), errno,
 952                         str_error_r(errno, msg, sizeof(msg)));
 953                 rc = -1;
 954                 goto out;
 955         }
 956
 957         rc = record__mmap(rec);
 958         if (rc)
 959                 goto out;
 960
 961         session->evlist = evlist;
 962         perf_session__set_id_hdr_size(session);
 963 out:
 964         return rc;
 965 }
 966
 967 static int process_sample_event(struct perf_tool *tool,
 968                                 union perf_event *event,
 969                                 struct perf_sample *sample,
 970                                 struct evsel *evsel,
 971                                 struct machine *machine)
 972 {
 973         struct record *rec = container_of(tool, struct record, tool);
 974
 975         if (rec->evlist->first_sample_time == 0)
 976                 rec->evlist->first_sample_time = sample->time;
 977
 978         rec->evlist->last_sample_time = sample->time;
 979
 980         if (rec->buildid_all)
 981                 return 0;
 982
 983         rec->samples++;
 984         return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
 985 }
 986
 987 static int process_buildids(struct record *rec)
 988 {
 989         struct perf_session *session = rec->session;
 990
 991         if (perf_data__size(&rec->data) == 0)
 992                 return 0;
 993
 994         /*
 995          * During this process, it'll load kernel map and replace the
 996          * dso->long_name to a real pathname it found.  In this case
 997          * we prefer the vmlinux path like
 998          *   /lib/modules/3.16.4/build/vmlinux
 999          *
1000          * rather than build-id path (in debug directory).
1001          *   $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
1002          */
1003         symbol_conf.ignore_vmlinux_buildid = true;
1004
1005         /*
1006          * If --buildid-all is given, it marks all DSO regardless of hits,
1007          * so no need to process samples. But if timestamp_boundary is enabled,
1008          * it still needs to walk on all samples to get the timestamps of
1009          * first/last samples.
1010          */
1011         if (rec->buildid_all && !rec->timestamp_boundary)
1012                 rec->tool.sample = NULL;
1013
1014         return perf_session__process_events(session);
1015 }
1016
1017 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
1018 {
1019         int err;
1020         struct perf_tool *tool = data;
1021         /*
1022          *As for guest kernel when processing subcommand record&report,
1023          *we arrange module mmap prior to guest kernel mmap and trigger
1024          *a preload dso because default guest module symbols are loaded
1025          *from guest kallsyms instead of /lib/modules/XXX/XXX. This
1026          *method is used to avoid symbol missing when the first addr is
1027          *in module instead of in guest kernel.
1028          */
1029         err = perf_event__synthesize_modules(tool, process_synthesized_event,
1030                                              machine);
1031         if (err < 0)
1032                 pr_err("Couldn't record guest kernel [%d]'s reference"
1033                        " relocation symbol.\n", machine->pid);
1034
1035         /*
1036          * We use _stext for guest kernel because guest kernel's /proc/kallsyms
1037          * have no _text sometimes.
1038          */
1039         err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1040                                                  machine);
1041         if (err < 0)
1042                 pr_err("Couldn't record guest kernel [%d]'s reference"
1043                        " relocation symbol.\n", machine->pid);
1044 }
1045
1046 static struct perf_event_header finished_round_event = {
1047         .size = sizeof(struct perf_event_header),
1048         .type = PERF_RECORD_FINISHED_ROUND,
1049 };
1050
1051 static void record__adjust_affinity(struct record *rec, struct mmap *map)
1052 {
1053         if (rec->opts.affinity != PERF_AFFINITY_SYS &&
1054             !bitmap_equal(rec->affinity_mask.bits, map->affinity_mask.bits,
1055                           rec->affinity_mask.nbits)) {
1056                 bitmap_zero(rec->affinity_mask.bits, rec->affinity_mask.nbits);
1057                 bitmap_or(rec->affinity_mask.bits, rec->affinity_mask.bits,
1058                           map->affinity_mask.bits, rec->affinity_mask.nbits);
1059                 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&rec->affinity_mask),
1060                                   (cpu_set_t *)rec->affinity_mask.bits);
1061                 if (verbose == 2)
1062                         mmap_cpu_mask__scnprintf(&rec->affinity_mask, "thread");
1063         }
1064 }
1065
1066 static size_t process_comp_header(void *record, size_t increment)
1067 {
1068         struct perf_record_compressed *event = record;
1069         size_t size = sizeof(*event);
1070
1071         if (increment) {
1072                 event->header.size += increment;
1073                 return increment;
1074         }
1075
1076         event->header.type = PERF_RECORD_COMPRESSED;
1077         event->header.size = size;
1078
1079         return size;
1080 }
1081
1082 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
1083                             void *src, size_t src_size)
1084 {
1085         size_t compressed;
1086         size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
1087
1088         compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size,
1089                                                      max_record_size, process_comp_header);
1090
1091         session->bytes_transferred += src_size;
1092         session->bytes_compressed  += compressed;
1093
1094         return compressed;
1095 }
1096
1097 static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
1098                                     bool overwrite, bool synch)
1099 {
1100         u64 bytes_written = rec->bytes_written;
1101         int i;
1102         int rc = 0;
1103         struct mmap *maps;
1104         int trace_fd = rec->data.file.fd;
1105         off_t off = 0;
1106
1107         if (!evlist)
1108                 return 0;
1109
1110         maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
1111         if (!maps)
1112                 return 0;
1113
1114         if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
1115                 return 0;
1116
1117         if (record__aio_enabled(rec))
1118                 off = record__aio_get_pos(trace_fd);
1119
1120         for (i = 0; i < evlist->core.nr_mmaps; i++) {
1121                 u64 flush = 0;
1122                 struct mmap *map = &maps[i];
1123
1124                 if (map->core.base) {
1125                         record__adjust_affinity(rec, map);
1126                         if (synch) {
1127                                 flush = map->core.flush;
1128                                 map->core.flush = 1;
1129                         }
1130                         if (!record__aio_enabled(rec)) {
1131                                 if (perf_mmap__push(map, rec, record__pushfn) < 0) {
1132                                         if (synch)
1133                                                 map->core.flush = flush;
1134                                         rc = -1;
1135                                         goto out;
1136                                 }
1137                         } else {
1138                                 if (record__aio_push(rec, map, &off) < 0) {
1139                                         record__aio_set_pos(trace_fd, off);
1140                                         if (synch)
1141                                                 map->core.flush = flush;
1142                                         rc = -1;
1143                                         goto out;
1144                                 }
1145                         }
1146                         if (synch)
1147                                 map->core.flush = flush;
1148                 }
1149
1150                 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
1151                     !rec->opts.auxtrace_sample_mode &&
1152                     record__auxtrace_mmap_read(rec, map) != 0) {
1153                         rc = -1;
1154                         goto out;
1155                 }
1156         }
1157
1158         if (record__aio_enabled(rec))
1159                 record__aio_set_pos(trace_fd, off);
1160
1161         /*
1162          * Mark the round finished in case we wrote
1163          * at least one event.
1164          */
1165         if (bytes_written != rec->bytes_written)
1166                 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));
1167
1168         if (overwrite)
1169                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
1170 out:
1171         return rc;
1172 }
1173
1174 static int record__mmap_read_all(struct record *rec, bool synch)
1175 {
1176         int err;
1177
1178         err = record__mmap_read_evlist(rec, rec->evlist, false, synch);
1179         if (err)
1180                 return err;
1181
1182         return record__mmap_read_evlist(rec, rec->evlist, true, synch);
1183 }
1184
1185 static void record__init_features(struct record *rec)
1186 {
1187         struct perf_session *session = rec->session;
1188         int feat;
1189
1190         for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1191                 perf_header__set_feat(&session->header, feat);
1192
1193         if (rec->no_buildid)
1194                 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1195
1196         if (!have_tracepoints(&rec->evlist->core.entries))
1197                 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1198
1199         if (!rec->opts.branch_stack)
1200                 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1201
1202         if (!rec->opts.full_auxtrace)
1203                 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1204
1205         if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
1206                 perf_header__clear_feat(&session->header, HEADER_CLOCKID);
1207
1208         if (!rec->opts.use_clockid)
1209                 perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);
1210
1211         perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1212         if (!record__comp_enabled(rec))
1213                 perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
1214
1215         perf_header__clear_feat(&session->header, HEADER_STAT);
1216 }
1217
1218 static void
1219 record__finish_output(struct record *rec)
1220 {
1221         struct perf_data *data = &rec->data;
1222         int fd = perf_data__fd(data);
1223
1224         if (data->is_pipe)
1225                 return;
1226
1227         rec->session->header.data_size += rec->bytes_written;
1228         data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
1229
1230         if (!rec->no_buildid) {
1231                 process_buildids(rec);
1232
1233                 if (rec->buildid_all)
1234                         dsos__hit_all(rec->session);
1235         }
1236         perf_session__write_header(rec->session, rec->evlist, fd, true);
1237
1238         return;
1239 }
1240
1241 static int record__synthesize_workload(struct record *rec, bool tail)
1242 {
1243         int err;
1244         struct perf_thread_map *thread_map;
1245
1246         if (rec->opts.tail_synthesize != tail)
1247                 return 0;
1248
1249         thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
1250         if (thread_map == NULL)
1251                 return -1;
1252
1253         err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
1254                                                  process_synthesized_event,
1255                                                  &rec->session->machines.host,
1256                                                  rec->opts.sample_address);
1257         perf_thread_map__put(thread_map);
1258         return err;
1259 }
1260
1261 static int record__synthesize(struct record *rec, bool tail);
1262
1263 static int
1264 record__switch_output(struct record *rec, bool at_exit)
1265 {
1266         struct perf_data *data = &rec->data;
1267         int fd, err;
1268         char *new_filename;
1269
1270         /* Same Size:      "2015122520103046"*/
1271         char timestamp[] = "InvalidTimestamp";
1272
1273         record__aio_mmap_read_sync(rec);
1274
1275         record__synthesize(rec, true);
1276         if (target__none(&rec->opts.target))
1277                 record__synthesize_workload(rec, true);
1278
1279         rec->samples = 0;
1280         record__finish_output(rec);
1281         err = fetch_current_timestamp(timestamp, sizeof(timestamp));
1282         if (err) {
1283                 pr_err("Failed to get current timestamp\n");
1284                 return -EINVAL;
1285         }
1286
1287         fd = perf_data__switch(data, timestamp,
1288                                     rec->session->header.data_offset,
1289                                     at_exit, &new_filename);
1290         if (fd >= 0 && !at_exit) {
1291                 rec->bytes_written = 0;
1292                 rec->session->header.data_size = 0;
1293         }
1294
1295         if (!quiet)
1296                 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
1297                         data->path, timestamp);
1298
1299         if (rec->switch_output.num_files) {
1300                 int n = rec->switch_output.cur_file + 1;
1301
1302                 if (n >= rec->switch_output.num_files)
1303                         n = 0;
1304                 rec->switch_output.cur_file = n;
1305                 if (rec->switch_output.filenames[n]) {
1306                         remove(rec->switch_output.filenames[n]);
1307                         zfree(&rec->switch_output.filenames[n]);
1308                 }
1309                 rec->switch_output.filenames[n] = new_filename;
1310         } else {
1311                 free(new_filename);
1312         }
1313
1314         /* Output tracking events */
1315         if (!at_exit) {
1316                 record__synthesize(rec, false);
1317
1318                 /*
1319                  * In 'perf record --switch-output' without -a,
1320                  * record__synthesize() in record__switch_output() won't
1321                  * generate tracking events because there's no thread_map
1322                  * in evlist. Which causes newly created perf.data doesn't
1323                  * contain map and comm information.
1324                  * Create a fake thread_map and directly call
1325                  * perf_event__synthesize_thread_map() for those events.
1326                  */
1327                 if (target__none(&rec->opts.target))
1328                         record__synthesize_workload(rec, false);
1329         }
1330         return fd;
1331 }
1332
1333 static volatile int workload_exec_errno;
1334
1335 /*
1336  * perf_evlist__prepare_workload will send a SIGUSR1
1337  * if the fork fails, since we asked by setting its
1338  * want_signal to true.
1339  */
1340 static void workload_exec_failed_signal(int signo __maybe_unused,
1341                                         siginfo_t *info,
1342                                         void *ucontext __maybe_unused)
1343 {
1344         workload_exec_errno = info->si_value.sival_int;
1345         done = 1;
1346         child_finished = 1;
1347 }
1348
1349 static void snapshot_sig_handler(int sig);
1350 static void alarm_sig_handler(int sig);
1351
1352 static const struct perf_event_mmap_page *
1353 perf_evlist__pick_pc(struct evlist *evlist)
1354 {
1355         if (evlist) {
1356                 if (evlist->mmap && evlist->mmap[0].core.base)
1357                         return evlist->mmap[0].core.base;
1358                 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base)
1359                         return evlist->overwrite_mmap[0].core.base;
1360         }
1361         return NULL;
1362 }
1363
1364 static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
1365 {
1366         const struct perf_event_mmap_page *pc;
1367
1368         pc = perf_evlist__pick_pc(rec->evlist);
1369         if (pc)
1370                 return pc;
1371         return NULL;
1372 }
1373
1374 static int record__synthesize(struct record *rec, bool tail)
1375 {
1376         struct perf_session *session = rec->session;
1377         struct machine *machine = &session->machines.host;
1378         struct perf_data *data = &rec->data;
1379         struct record_opts *opts = &rec->opts;
1380         struct perf_tool *tool = &rec->tool;
1381         int fd = perf_data__fd(data);
1382         int err = 0;
1383         event_op f = process_synthesized_event;
1384
1385         if (rec->opts.tail_synthesize != tail)
1386                 return 0;
1387
1388         if (data->is_pipe) {
1389                 /*
1390                  * We need to synthesize events first, because some
1391                  * features works on top of them (on report side).
1392                  */
1393                 err = perf_event__synthesize_attrs(tool, rec->evlist,
1394                                                    process_synthesized_event);
1395                 if (err < 0) {
1396                         pr_err("Couldn't synthesize attrs.\n");
1397                         goto out;
1398                 }
1399
1400                 err = perf_event__synthesize_features(tool, session, rec->evlist,
1401                                                       process_synthesized_event);
1402                 if (err < 0) {
1403                         pr_err("Couldn't synthesize features.\n");
1404                         return err;
1405                 }
1406
1407                 if (have_tracepoints(&rec->evlist->core.entries)) {
1408                         /*
1409                          * FIXME err <= 0 here actually means that
1410                          * there were no tracepoints so its not really
1411                          * an error, just that we don't need to
1412                          * synthesize anything.  We really have to
1413                          * return this more properly and also
1414                          * propagate errors that now are calling die()
1415                          */
1416                         err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist,
1417                                                                   process_synthesized_event);
1418                         if (err <= 0) {
1419                                 pr_err("Couldn't record tracing data.\n");
1420                                 goto out;
1421                         }
1422                         rec->bytes_written += err;
1423                 }
1424         }
1425
1426         err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
1427                                           process_synthesized_event, machine);
1428         if (err)
1429                 goto out;
1430
1431         /* Synthesize id_index before auxtrace_info */
1432         if (rec->opts.auxtrace_sample_mode) {
1433                 err = perf_event__synthesize_id_index(tool,
1434                                                       process_synthesized_event,
1435                                                       session->evlist, machine);
1436                 if (err)
1437                         goto out;
1438         }
1439
1440         if (rec->opts.full_auxtrace) {
1441                 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
1442                                         session, process_synthesized_event);
1443                 if (err)
1444                         goto out;
1445         }
1446
1447         if (!perf_evlist__exclude_kernel(rec->evlist)) {
1448                 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1449                                                          machine);
1450                 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
1451                                    "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1452                                    "Check /proc/kallsyms permission or run as root.\n");
1453
1454                 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1455                                                      machine);
1456                 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
1457                                    "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1458                                    "Check /proc/modules permission or run as root.\n");
1459         }
1460
1461         if (perf_guest) {
1462                 machines__process_guests(&session->machines,
1463                                          perf_event__synthesize_guest_os, tool);
1464         }
1465
1466         err = perf_event__synthesize_extra_attr(&rec->tool,
1467                                                 rec->evlist,
1468                                                 process_synthesized_event,
1469                                                 data->is_pipe);
1470         if (err)
1471                 goto out;
1472
1473         err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads,
1474                                                  process_synthesized_event,
1475                                                 NULL);
1476         if (err < 0) {
1477                 pr_err("Couldn't synthesize thread map.\n");
1478                 return err;
1479         }
1480
1481         err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.cpus,
1482                                              process_synthesized_event, NULL);
1483         if (err < 0) {
1484                 pr_err("Couldn't synthesize cpu map.\n");
1485                 return err;
1486         }
1487
1488         err = perf_event__synthesize_bpf_events(session, process_synthesized_event,
1489                                                 machine, opts);
1490         if (err < 0)
1491                 pr_warning("Couldn't synthesize bpf events.\n");
1492
1493         err = perf_event__synthesize_cgroups(tool, process_synthesized_event,
1494                                              machine);
1495         if (err < 0)
1496                 pr_warning("Couldn't synthesize cgroup events.\n");
1497
1498         if (rec->opts.nr_threads_synthesize > 1) {
1499                 perf_set_multithreaded();
1500                 f = process_locked_synthesized_event;
1501         }
1502
1503         err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->core.threads,
1504                                             f, opts->sample_address,
1505                                             rec->opts.nr_threads_synthesize);
1506
1507         if (rec->opts.nr_threads_synthesize > 1)
1508                 perf_set_singlethreaded();
1509
1510 out:
1511         return err;
1512 }
1513
1514 static int record__process_signal_event(union perf_event *event __maybe_unused, void *data)
1515 {
1516         struct record *rec = data;
1517         pthread_kill(rec->thread_id, SIGUSR2);
1518         return 0;
1519 }
1520
1521 static int record__setup_sb_evlist(struct record *rec)
1522 {
1523         struct record_opts *opts = &rec->opts;
1524
1525         if (rec->sb_evlist != NULL) {
1526                 /*
1527                  * We get here if --switch-output-event populated the
1528                  * sb_evlist, so associate a callback that will send a SIGUSR2
1529                  * to the main thread.
1530                  */
1531                 evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec);
1532                 rec->thread_id = pthread_self();
1533         }
1534
1535         if (!opts->no_bpf_event) {
1536                 if (rec->sb_evlist == NULL) {
1537                         rec->sb_evlist = evlist__new();
1538
1539                         if (rec->sb_evlist == NULL) {
1540                                 pr_err("Couldn't create side band evlist.\n.");
1541                                 return -1;
1542                         }
1543                 }
1544
1545                 if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) {
1546                         pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
1547                         return -1;
1548                 }
1549         }
1550
1551         if (perf_evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) {
1552                 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1553                 opts->no_bpf_event = true;
1554         }
1555
1556         return 0;
1557 }
1558
1559 static int record__init_clock(struct record *rec)
1560 {
1561         struct perf_session *session = rec->session;
1562         struct timespec ref_clockid;
1563         struct timeval ref_tod;
1564         u64 ref;
1565
1566         if (!rec->opts.use_clockid)
1567                 return 0;
1568
1569         if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
1570                 session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns;
1571
1572         session->header.env.clock.clockid = rec->opts.clockid;
1573
1574         if (gettimeofday(&ref_tod, NULL) != 0) {
1575                 pr_err("gettimeofday failed, cannot set reference time.\n");
1576                 return -1;
1577         }
1578
1579         if (clock_gettime(rec->opts.clockid, &ref_clockid)) {
1580                 pr_err("clock_gettime failed, cannot set reference time.\n");
1581                 return -1;
1582         }
1583
1584         ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC +
1585               (u64) ref_tod.tv_usec * NSEC_PER_USEC;
1586
1587         session->header.env.clock.tod_ns = ref;
1588
1589         ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC +
1590               (u64) ref_clockid.tv_nsec;
1591
1592         session->header.env.clock.clockid_ns = ref;
1593         return 0;
1594 }
1595
1596 static int __cmd_record(struct record *rec, int argc, const char **argv)
1597 {
1598         int err;
1599         int status = 0;
1600         unsigned long waking = 0;
1601         const bool forks = argc > 0;
1602         struct perf_tool *tool = &rec->tool;
1603         struct record_opts *opts = &rec->opts;
1604         struct perf_data *data = &rec->data;
1605         struct perf_session *session;
1606         bool disabled = false, draining = false;
1607         int fd;
1608         float ratio = 0;
1609         enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
1610
1611         atexit(record__sig_exit);
1612         signal(SIGCHLD, sig_handler);
1613         signal(SIGINT, sig_handler);
1614         signal(SIGTERM, sig_handler);
1615         signal(SIGSEGV, sigsegv_handler);
1616
1617         if (rec->opts.record_namespaces)
1618                 tool->namespace_events = true;
1619
1620         if (rec->opts.record_cgroup) {
1621 #ifdef HAVE_FILE_HANDLE
1622                 tool->cgroup_events = true;
1623 #else
1624                 pr_err("cgroup tracking is not supported\n");
1625                 return -1;
1626 #endif
1627         }
1628
1629         if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
1630                 signal(SIGUSR2, snapshot_sig_handler);
1631                 if (rec->opts.auxtrace_snapshot_mode)
1632                         trigger_on(&auxtrace_snapshot_trigger);
1633                 if (rec->switch_output.enabled)
1634                         trigger_on(&switch_output_trigger);
1635         } else {
1636                 signal(SIGUSR2, SIG_IGN);
1637         }
1638
1639         session = perf_session__new(data, false, tool);
1640         if (IS_ERR(session)) {
1641                 pr_err("Perf session creation failed.\n");
1642                 return PTR_ERR(session);
1643         }
1644
1645         fd = perf_data__fd(data);
1646         rec->session = session;
1647
1648         if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
1649                 pr_err("Compression initialization failed.\n");
1650                 return -1;
1651         }
1652 #ifdef HAVE_EVENTFD_SUPPORT
1653         done_fd = eventfd(0, EFD_NONBLOCK);
1654         if (done_fd < 0) {
1655                 pr_err("Failed to create wakeup eventfd, error: %m\n");
1656                 status = -1;
1657                 goto out_delete_session;
1658         }
1659         err = evlist__add_pollfd(rec->evlist, done_fd);
1660         if (err < 0) {
1661                 pr_err("Failed to add wakeup eventfd to poll list\n");
1662                 status = err;
1663                 goto out_delete_session;
1664         }
1665 #endif // HAVE_EVENTFD_SUPPORT
1666
1667         session->header.env.comp_type  = PERF_COMP_ZSTD;
1668         session->header.env.comp_level = rec->opts.comp_level;
1669
1670         if (rec->opts.kcore &&
1671             !record__kcore_readable(&session->machines.host)) {
1672                 pr_err("ERROR: kcore is not readable.\n");
1673                 return -1;
1674         }
1675
1676         if (record__init_clock(rec))
1677                 return -1;
1678
1679         record__init_features(rec);
1680
1681         if (forks) {
1682                 err = perf_evlist__prepare_workload(rec->evlist, &opts->target,
1683                                                     argv, data->is_pipe,
1684                                                     workload_exec_failed_signal);
1685                 if (err < 0) {
1686                         pr_err("Couldn't run the workload!\n");
1687                         status = err;
1688                         goto out_delete_session;
1689                 }
1690         }
1691
1692         /*
1693          * If we have just single event and are sending data
1694          * through pipe, we need to force the ids allocation,
1695          * because we synthesize event name through the pipe
1696          * and need the id for that.
1697          */
1698         if (data->is_pipe && rec->evlist->core.nr_entries == 1)
1699                 rec->opts.sample_id = true;
1700
1701         if (record__open(rec) != 0) {
1702                 err = -1;
1703                 goto out_child;
1704         }
1705         session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
1706
1707         if (rec->opts.kcore) {
1708                 err = record__kcore_copy(&session->machines.host, data);
1709                 if (err) {
1710                         pr_err("ERROR: Failed to copy kcore\n");
1711                         goto out_child;
1712                 }
1713         }
1714
1715         err = bpf__apply_obj_config();
1716         if (err) {
1717                 char errbuf[BUFSIZ];
1718
1719                 bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
1720                 pr_err("ERROR: Apply config to BPF failed: %s\n",
1721                          errbuf);
1722                 goto out_child;
1723         }
1724
1725         /*
1726          * Normally perf_session__new would do this, but it doesn't have the
1727          * evlist.
1728          */
1729         if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) {
1730                 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
1731                 rec->tool.ordered_events = false;
1732         }
1733
1734         if (!rec->evlist->nr_groups)
1735                 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
1736
1737         if (data->is_pipe) {
1738                 err = perf_header__write_pipe(fd);
1739                 if (err < 0)
1740                         goto out_child;
1741         } else {
1742                 err = perf_session__write_header(session, rec->evlist, fd, false);
1743                 if (err < 0)
1744                         goto out_child;
1745         }
1746
1747         err = -1;
1748         if (!rec->no_buildid
1749             && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
1750                 pr_err("Couldn't generate buildids. "
1751                        "Use --no-buildid to profile anyway.\n");
1752                 goto out_child;
1753         }
1754
1755         err = record__setup_sb_evlist(rec);
1756         if (err)
1757                 goto out_child;
1758
1759         err = record__synthesize(rec, false);
1760         if (err < 0)
1761                 goto out_child;
1762
1763         if (rec->realtime_prio) {
1764                 struct sched_param param;
1765
1766                 param.sched_priority = rec->realtime_prio;
1767                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1768                         pr_err("Could not set realtime priority.\n");
1769                         err = -1;
1770                         goto out_child;
1771                 }
1772         }
1773
1774         /*
1775          * When perf is starting the traced process, all the events
1776          * (apart from group members) have enable_on_exec=1 set,
1777          * so don't spoil it by prematurely enabling them.
1778          */
1779         if (!target__none(&opts->target) && !opts->initial_delay)
1780                 evlist__enable(rec->evlist);
1781
1782         /*
1783          * Let the child rip
1784          */
1785         if (forks) {
1786                 struct machine *machine = &session->machines.host;
1787                 union perf_event *event;
1788                 pid_t tgid;
1789
1790                 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
1791                 if (event == NULL) {
1792                         err = -ENOMEM;
1793                         goto out_child;
1794                 }
1795
1796                 /*
1797                  * Some H/W events are generated before COMM event
1798                  * which is emitted during exec(), so perf script
1799                  * cannot see a correct process name for those events.
1800                  * Synthesize COMM event to prevent it.
1801                  */
1802                 tgid = perf_event__synthesize_comm(tool, event,
1803                                                    rec->evlist->workload.pid,
1804                                                    process_synthesized_event,
1805                                                    machine);
1806                 free(event);
1807
1808                 if (tgid == -1)
1809                         goto out_child;
1810
1811                 event = malloc(sizeof(event->namespaces) +
1812                                (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
1813                                machine->id_hdr_size);
1814                 if (event == NULL) {
1815                         err = -ENOMEM;
1816                         goto out_child;
1817                 }
1818
1819                 /*
1820                  * Synthesize NAMESPACES event for the command specified.
1821                  */
1822                 perf_event__synthesize_namespaces(tool, event,
1823                                                   rec->evlist->workload.pid,
1824                                                   tgid, process_synthesized_event,
1825                                                   machine);
1826                 free(event);
1827
1828                 perf_evlist__start_workload(rec->evlist);
1829         }
1830
1831         if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack))
1832                 goto out_child;
1833
1834         if (opts->initial_delay) {
1835                 pr_info(EVLIST_DISABLED_MSG);
1836                 if (opts->initial_delay > 0) {
1837                         usleep(opts->initial_delay * USEC_PER_MSEC);
1838                         evlist__enable(rec->evlist);
1839                         pr_info(EVLIST_ENABLED_MSG);
1840                 }
1841         }
1842
1843         trigger_ready(&auxtrace_snapshot_trigger);
1844         trigger_ready(&switch_output_trigger);
1845         perf_hooks__invoke_record_start();
1846         for (;;) {
1847                 unsigned long long hits = rec->samples;
1848
1849                 /*
1850                  * rec->evlist->bkw_mmap_state is possible to be
1851                  * BKW_MMAP_EMPTY here: when done == true and
1852                  * hits != rec->samples in previous round.
1853                  *
1854                  * perf_evlist__toggle_bkw_mmap ensure we never
1855                  * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
1856                  */
1857                 if (trigger_is_hit(&switch_output_trigger) || done || draining)
1858                         perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
1859
1860                 if (record__mmap_read_all(rec, false) < 0) {
1861                         trigger_error(&auxtrace_snapshot_trigger);
1862                         trigger_error(&switch_output_trigger);
1863                         err = -1;
1864                         goto out_child;
1865                 }
1866
1867                 if (auxtrace_record__snapshot_started) {
1868                         auxtrace_record__snapshot_started = 0;
1869                         if (!trigger_is_error(&auxtrace_snapshot_trigger))
1870                                 record__read_auxtrace_snapshot(rec, false);
1871                         if (trigger_is_error(&auxtrace_snapshot_trigger)) {
1872                                 pr_err("AUX area tracing snapshot failed\n");
1873                                 err = -1;
1874                                 goto out_child;
1875                         }
1876                 }
1877
1878                 if (trigger_is_hit(&switch_output_trigger)) {
1879                         /*
1880                          * If switch_output_trigger is hit, the data in
1881                          * overwritable ring buffer should have been collected,
1882                          * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
1883                          *
1884                          * If SIGUSR2 raise after or during record__mmap_read_all(),
1885                          * record__mmap_read_all() didn't collect data from
1886                          * overwritable ring buffer. Read again.
1887                          */
1888                         if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
1889                                 continue;
1890                         trigger_ready(&switch_output_trigger);
1891
1892                         /*
1893                          * Reenable events in overwrite ring buffer after
1894                          * record__mmap_read_all(): we should have collected
1895                          * data from it.
1896                          */
1897                         perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
1898
1899                         if (!quiet)
1900                                 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
1901                                         waking);
1902                         waking = 0;
1903                         fd = record__switch_output(rec, false);
1904                         if (fd < 0) {
1905                                 pr_err("Failed to switch to new file\n");
1906                                 trigger_error(&switch_output_trigger);
1907                                 err = fd;
1908                                 goto out_child;
1909                         }
1910
1911                         /* re-arm the alarm */
1912                         if (rec->switch_output.time)
1913                                 alarm(rec->switch_output.time);
1914                 }
1915
1916                 if (hits == rec->samples) {
1917                         if (done || draining)
1918                                 break;
1919                         err = evlist__poll(rec->evlist, -1);
1920                         /*
1921                          * Propagate error, only if there's any. Ignore positive
1922                          * number of returned events and interrupt error.
1923                          */
1924                         if (err > 0 || (err < 0 && errno == EINTR))
1925                                 err = 0;
1926                         waking++;
1927
1928                         if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
1929                                 draining = true;
1930                 }
1931
1932                 if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
1933                         switch (cmd) {
1934                         case EVLIST_CTL_CMD_ENABLE:
1935                                 pr_info(EVLIST_ENABLED_MSG);
1936                                 break;
1937                         case EVLIST_CTL_CMD_DISABLE:
1938                                 pr_info(EVLIST_DISABLED_MSG);
1939                                 break;
1940                         case EVLIST_CTL_CMD_ACK:
1941                         case EVLIST_CTL_CMD_UNSUPPORTED:
1942                         default:
1943                                 break;
1944                         }
1945                 }
1946
1947                 /*
1948                  * When perf is starting the traced process, at the end events
1949                  * die with the process and we wait for that. Thus no need to
1950                  * disable events in this case.
1951                  */
1952                 if (done && !disabled && !target__none(&opts->target)) {
1953                         trigger_off(&auxtrace_snapshot_trigger);
1954                         evlist__disable(rec->evlist);
1955                         disabled = true;
1956                 }
1957         }
1958
1959         trigger_off(&auxtrace_snapshot_trigger);
1960         trigger_off(&switch_output_trigger);
1961
1962         if (opts->auxtrace_snapshot_on_exit)
1963                 record__auxtrace_snapshot_exit(rec);
1964
1965         if (forks && workload_exec_errno) {
1966                 char msg[STRERR_BUFSIZE];
1967                 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
1968                 pr_err("Workload failed: %s\n", emsg);
1969                 err = -1;
1970                 goto out_child;
1971         }
1972
1973         if (!quiet)
1974                 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
1975
1976         if (target__none(&rec->opts.target))
1977                 record__synthesize_workload(rec, true);
1978
1979 out_child:
1980         evlist__finalize_ctlfd(rec->evlist);
1981         record__mmap_read_all(rec, true);
1982         record__aio_mmap_read_sync(rec);
1983
1984         if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
1985                 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
1986                 session->header.env.comp_ratio = ratio + 0.5;
1987         }
1988
1989         if (forks) {
1990                 int exit_status;
1991
1992                 if (!child_finished)
1993                         kill(rec->evlist->workload.pid, SIGTERM);
1994
1995                 wait(&exit_status);
1996
1997                 if (err < 0)
1998                         status = err;
1999                 else if (WIFEXITED(exit_status))
2000                         status = WEXITSTATUS(exit_status);
2001                 else if (WIFSIGNALED(exit_status))
2002                         signr = WTERMSIG(exit_status);
2003         } else
2004                 status = err;
2005
2006         record__synthesize(rec, true);
2007         /* this will be recalculated during process_buildids() */
2008         rec->samples = 0;
2009
2010         if (!err) {
2011                 if (!rec->timestamp_filename) {
2012                         record__finish_output(rec);
2013                 } else {
2014                         fd = record__switch_output(rec, true);
2015                         if (fd < 0) {
2016                                 status = fd;
2017                                 goto out_delete_session;
2018                         }
2019                 }
2020         }
2021
2022         perf_hooks__invoke_record_end();
2023
2024         if (!err && !quiet) {
2025                 char samples[128];
2026                 const char *postfix = rec->timestamp_filename ?
2027                                         ".<timestamp>" : "";
2028
2029                 if (rec->samples && !rec->opts.full_auxtrace)
2030                         scnprintf(samples, sizeof(samples),
2031                                   " (%" PRIu64 " samples)", rec->samples);
2032                 else
2033                         samples[0] = '\0';
2034
2035                 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s",
2036                         perf_data__size(data) / 1024.0 / 1024.0,
2037                         data->path, postfix, samples);
2038                 if (ratio) {
2039                         fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)",
2040                                         rec->session->bytes_transferred / 1024.0 / 1024.0,
2041                                         ratio);
2042                 }
2043                 fprintf(stderr, " ]\n");
2044         }
2045
2046 out_delete_session:
2047 #ifdef HAVE_EVENTFD_SUPPORT
2048         if (done_fd >= 0)
2049                 close(done_fd);
2050 #endif
2051         zstd_fini(&session->zstd_data);
2052         perf_session__delete(session);
2053
2054         if (!opts->no_bpf_event)
2055                 perf_evlist__stop_sb_thread(rec->sb_evlist);
2056         return status;
2057 }
2058
2059 static void callchain_debug(struct callchain_param *callchain)
2060 {
2061         static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
2062
2063         pr_debug("callchain: type %s\n", str[callchain->record_mode]);
2064
2065         if (callchain->record_mode == CALLCHAIN_DWARF)
2066                 pr_debug("callchain: stack dump size %d\n",
2067                          callchain->dump_size);
2068 }
2069
2070 int record_opts__parse_callchain(struct record_opts *record,
2071                                  struct callchain_param *callchain,
2072                                  const char *arg, bool unset)
2073 {
2074         int ret;
2075         callchain->enabled = !unset;
2076
2077         /* --no-call-graph */
2078         if (unset) {
2079                 callchain->record_mode = CALLCHAIN_NONE;
2080                 pr_debug("callchain: disabled\n");
2081                 return 0;
2082         }
2083
2084         ret = parse_callchain_record_opt(arg, callchain);
2085         if (!ret) {
2086                 /* Enable data address sampling for DWARF unwind. */
2087                 if (callchain->record_mode == CALLCHAIN_DWARF)
2088                         record->sample_address = true;
2089                 callchain_debug(callchain);
2090         }
2091
2092         return ret;
2093 }
2094
2095 int record_parse_callchain_opt(const struct option *opt,
2096                                const char *arg,
2097                                int unset)
2098 {
2099         return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
2100 }
2101
2102 int record_callchain_opt(const struct option *opt,
2103                          const char *arg __maybe_unused,
2104                          int unset __maybe_unused)
2105 {
2106         struct callchain_param *callchain = opt->value;
2107
2108         callchain->enabled = true;
2109
2110         if (callchain->record_mode == CALLCHAIN_NONE)
2111                 callchain->record_mode = CALLCHAIN_FP;
2112
2113         callchain_debug(callchain);
2114         return 0;
2115 }
2116
2117 static int perf_record_config(const char *var, const char *value, void *cb)
2118 {
2119         struct record *rec = cb;
2120
2121         if (!strcmp(var, "record.build-id")) {
2122                 if (!strcmp(value, "cache"))
2123                         rec->no_buildid_cache = false;
2124                 else if (!strcmp(value, "no-cache"))
2125                         rec->no_buildid_cache = true;
2126                 else if (!strcmp(value, "skip"))
2127                         rec->no_buildid = true;
2128                 else
2129                         return -1;
2130                 return 0;
2131         }
2132         if (!strcmp(var, "record.call-graph")) {
2133                 var = "call-graph.record-mode";
2134                 return perf_default_config(var, value, cb);
2135         }
2136 #ifdef HAVE_AIO_SUPPORT
2137         if (!strcmp(var, "record.aio")) {
2138                 rec->opts.nr_cblocks = strtol(value, NULL, 0);
2139                 if (!rec->opts.nr_cblocks)
2140                         rec->opts.nr_cblocks = nr_cblocks_default;
2141         }
2142 #endif
2143
2144         return 0;
2145 }
2146
2147
2148 static int record__parse_affinity(const struct option *opt, const char *str, int unset)
2149 {
2150         struct record_opts *opts = (struct record_opts *)opt->value;
2151
2152         if (unset || !str)
2153                 return 0;
2154
2155         if (!strcasecmp(str, "node"))
2156                 opts->affinity = PERF_AFFINITY_NODE;
2157         else if (!strcasecmp(str, "cpu"))
2158                 opts->affinity = PERF_AFFINITY_CPU;
2159
2160         return 0;
2161 }
2162
2163 static int parse_output_max_size(const struct option *opt,
2164                                  const char *str, int unset)
2165 {
2166         unsigned long *s = (unsigned long *)opt->value;
2167         static struct parse_tag tags_size[] = {
2168                 { .tag  = 'B', .mult = 1       },
2169                 { .tag  = 'K', .mult = 1 << 10 },
2170                 { .tag  = 'M', .mult = 1 << 20 },
2171                 { .tag  = 'G', .mult = 1 << 30 },
2172                 { .tag  = 0 },
2173         };
2174         unsigned long val;
2175
2176         if (unset) {
2177                 *s = 0;
2178                 return 0;
2179         }
2180
2181         val = parse_tag_value(str, tags_size);
2182         if (val != (unsigned long) -1) {
2183                 *s = val;
2184                 return 0;
2185         }
2186
2187         return -1;
2188 }
2189
2190 static int record__parse_mmap_pages(const struct option *opt,
2191                                     const char *str,
2192                                     int unset __maybe_unused)
2193 {
2194         struct record_opts *opts = opt->value;
2195         char *s, *p;
2196         unsigned int mmap_pages;
2197         int ret;
2198
2199         if (!str)
2200                 return -EINVAL;
2201
2202         s = strdup(str);
2203         if (!s)
2204                 return -ENOMEM;
2205
2206         p = strchr(s, ',');
2207         if (p)
2208                 *p = '\0';
2209
2210         if (*s) {
2211                 ret = __perf_evlist__parse_mmap_pages(&mmap_pages, s);
2212                 if (ret)
2213                         goto out_free;
2214                 opts->mmap_pages = mmap_pages;
2215         }
2216
2217         if (!p) {
2218                 ret = 0;
2219                 goto out_free;
2220         }
2221
2222         ret = __perf_evlist__parse_mmap_pages(&mmap_pages, p + 1);
2223         if (ret)
2224                 goto out_free;
2225
2226         opts->auxtrace_mmap_pages = mmap_pages;
2227
2228 out_free:
2229         free(s);
2230         return ret;
2231 }
2232
2233 static int parse_control_option(const struct option *opt,
2234                                 const char *str,
2235                                 int unset __maybe_unused)
2236 {
2237         char *comma = NULL, *endptr = NULL;
2238         struct record_opts *config = (struct record_opts *)opt->value;
2239
2240         if (strncmp(str, "fd:", 3))
2241                 return -EINVAL;
2242
2243         config->ctl_fd = strtoul(&str[3], &endptr, 0);
2244         if (endptr == &str[3])
2245                 return -EINVAL;
2246
2247         comma = strchr(str, ',');
2248         if (comma) {
2249                 if (endptr != comma)
2250                         return -EINVAL;
2251
2252                 config->ctl_fd_ack = strtoul(comma + 1, &endptr, 0);
2253                 if (endptr == comma + 1 || *endptr != '\0')
2254                         return -EINVAL;
2255         }
2256
2257         return 0;
2258 }
2259
2260 static void switch_output_size_warn(struct record *rec)
2261 {
2262         u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
2263         struct switch_output *s = &rec->switch_output;
2264
2265         wakeup_size /= 2;
2266
2267         if (s->size < wakeup_size) {
2268                 char buf[100];
2269
2270                 unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
2271                 pr_warning("WARNING: switch-output data size lower than "
2272                            "wakeup kernel buffer size (%s) "
2273                            "expect bigger perf.data sizes\n", buf);
2274         }
2275 }
2276
2277 static int switch_output_setup(struct record *rec)
2278 {
2279         struct switch_output *s = &rec->switch_output;
2280         static struct parse_tag tags_size[] = {
2281                 { .tag  = 'B', .mult = 1       },
2282                 { .tag  = 'K', .mult = 1 << 10 },
2283                 { .tag  = 'M', .mult = 1 << 20 },
2284                 { .tag  = 'G', .mult = 1 << 30 },
2285                 { .tag  = 0 },
2286         };
2287         static struct parse_tag tags_time[] = {
2288                 { .tag  = 's', .mult = 1        },
2289                 { .tag  = 'm', .mult = 60       },
2290                 { .tag  = 'h', .mult = 60*60    },
2291                 { .tag  = 'd', .mult = 60*60*24 },
2292                 { .tag  = 0 },
2293         };
2294         unsigned long val;
2295
2296         /*
2297          * If we're using --switch-output-events, then we imply its
2298          * --switch-output=signal, as we'll send a SIGUSR2 from the side band
2299          *  thread to its parent.
2300          */
2301         if (rec->switch_output_event_set)
2302                 goto do_signal;
2303
2304         if (!s->set)
2305                 return 0;
2306
2307         if (!strcmp(s->str, "signal")) {
2308 do_signal:
2309                 s->signal = true;
2310                 pr_debug("switch-output with SIGUSR2 signal\n");
2311                 goto enabled;
2312         }
2313
2314         val = parse_tag_value(s->str, tags_size);
2315         if (val != (unsigned long) -1) {
2316                 s->size = val;
2317                 pr_debug("switch-output with %s size threshold\n", s->str);
2318                 goto enabled;
2319         }
2320
2321         val = parse_tag_value(s->str, tags_time);
2322         if (val != (unsigned long) -1) {
2323                 s->time = val;
2324                 pr_debug("switch-output with %s time threshold (%lu seconds)\n",
2325                          s->str, s->time);
2326                 goto enabled;
2327         }
2328
2329         return -1;
2330
2331 enabled:
2332         rec->timestamp_filename = true;
2333         s->enabled              = true;
2334
2335         if (s->size && !rec->opts.no_buffering)
2336                 switch_output_size_warn(rec);
2337
2338         return 0;
2339 }
2340
2341 static const char * const __record_usage[] = {
2342         "perf record [<options>] [<command>]",
2343         "perf record [<options>] -- <command> [<options>]",
2344         NULL
2345 };
2346 const char * const *record_usage = __record_usage;
2347
2348 static int build_id__process_mmap(struct perf_tool *tool, union perf_event *event,
2349                                   struct perf_sample *sample, struct machine *machine)
2350 {
2351         /*
2352          * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
2353          * no need to add them twice.
2354          */
2355         if (!(event->header.misc & PERF_RECORD_MISC_USER))
2356                 return 0;
2357         return perf_event__process_mmap(tool, event, sample, machine);
2358 }
2359
2360 static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event,
2361                                    struct perf_sample *sample, struct machine *machine)
2362 {
2363         /*
2364          * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
2365          * no need to add them twice.
2366          */
2367         if (!(event->header.misc & PERF_RECORD_MISC_USER))
2368                 return 0;
2369
2370         return perf_event__process_mmap2(tool, event, sample, machine);
2371 }
2372
2373 /*
2374  * XXX Ideally would be local to cmd_record() and passed to a record__new
2375  * because we need to have access to it in record__exit, that is called
2376  * after cmd_record() exits, but since record_options need to be accessible to
2377  * builtin-script, leave it here.
2378  *
2379  * At least we don't ouch it in all the other functions here directly.
2380  *
2381  * Just say no to tons of global variables, sigh.
2382  */
2383 static struct record record = {
2384         .opts = {
2385                 .sample_time         = true,
2386                 .mmap_pages          = UINT_MAX,
2387                 .user_freq           = UINT_MAX,
2388                 .user_interval       = ULLONG_MAX,
2389                 .freq                = 4000,
2390                 .target              = {
2391                         .uses_mmap   = true,
2392                         .default_per_cpu = true,
2393                 },
2394                 .mmap_flush          = MMAP_FLUSH_DEFAULT,
2395                 .nr_threads_synthesize = 1,
2396                 .ctl_fd              = -1,
2397                 .ctl_fd_ack          = -1,
2398         },
2399         .tool = {
2400                 .sample         = process_sample_event,
2401                 .fork           = perf_event__process_fork,
2402                 .exit           = perf_event__process_exit,
2403                 .comm           = perf_event__process_comm,
2404                 .namespaces     = perf_event__process_namespaces,
2405                 .mmap           = build_id__process_mmap,
2406                 .mmap2          = build_id__process_mmap2,
2407                 .ordered_events = true,
2408         },
2409 };
2410
2411 const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
2412         "\n\t\t\t\tDefault: fp";
2413
2414 static bool dry_run;
2415
2416 /*
2417  * XXX Will stay a global variable till we fix builtin-script.c to stop messing
2418  * with it and switch to use the library functions in perf_evlist that came
2419  * from builtin-record.c, i.e. use record_opts,
2420  * perf_evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
2421  * using pipes, etc.
2422  */
2423 static struct option __record_options[] = {
2424         OPT_CALLBACK('e', "event", &record.evlist, "event",
2425                      "event selector. use 'perf list' to list available events",
2426                      parse_events_option),
2427         OPT_CALLBACK(0, "filter", &record.evlist, "filter",
2428                      "event filter", parse_filter),
2429         OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
2430                            NULL, "don't record events from perf itself",
2431                            exclude_perf),
2432         OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
2433                     "record events on existing process id"),
2434         OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
2435                     "record events on existing thread id"),
2436         OPT_INTEGER('r', "realtime", &record.realtime_prio,
2437                     "collect data with this RT SCHED_FIFO priority"),
2438         OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
2439                     "collect data without buffering"),
2440         OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
2441                     "collect raw sample records from all opened counters"),
2442         OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
2443                             "system-wide collection from all CPUs"),
2444         OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
2445                     "list of cpus to monitor"),
2446         OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
2447         OPT_STRING('o', "output", &record.data.path, "file",
2448                     "output file name"),
2449         OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
2450                         &record.opts.no_inherit_set,
2451                         "child tasks do not inherit counters"),
2452         OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
2453                     "synthesize non-sample events at the end of output"),
2454         OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
2455         OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "record bpf events"),
2456         OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
2457                     "Fail if the specified frequency can't be used"),
2458         OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
2459                      "profile at this frequency",
2460                       record__parse_freq),
2461         OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
2462                      "number of mmap data pages and AUX area tracing mmap pages",
2463                      record__parse_mmap_pages),
2464         OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
2465                      "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
2466                      record__mmap_flush_parse),
2467         OPT_BOOLEAN(0, "group", &record.opts.group,
2468                     "put the counters into a counter group"),
2469         OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
2470                            NULL, "enables call-graph recording" ,
2471                            &record_callchain_opt),
2472         OPT_CALLBACK(0, "call-graph", &record.opts,
2473                      "record_mode[,record_size]", record_callchain_help,
2474                      &record_parse_callchain_opt),
2475         OPT_INCR('v', "verbose", &verbose,
2476                     "be more verbose (show counter open errors, etc)"),
2477         OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
2478         OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
2479                     "per thread counts"),
2480         OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
2481         OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
2482                     "Record the sample physical addresses"),
2483         OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
2484         OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
2485                         &record.opts.sample_time_set,
2486                         "Record the sample timestamps"),
2487         OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
2488                         "Record the sample period"),
2489         OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
2490                     "don't sample"),
2491         OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
2492                         &record.no_buildid_cache_set,
2493                         "do not update the buildid cache"),
2494         OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
2495                         &record.no_buildid_set,
2496                         "do not collect buildids in perf.data"),
2497         OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
2498                      "monitor event in cgroup name only",
2499                      parse_cgroups),
2500         OPT_INTEGER('D', "delay", &record.opts.initial_delay,
2501                   "ms to wait before starting measurement after program start (-1: start with events disabled)"),
2502         OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"),
2503         OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
2504                    "user to profile"),
2505
2506         OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
2507                      "branch any", "sample any taken branches",
2508                      parse_branch_stack),
2509
2510         OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
2511                      "branch filter mask", "branch stack filter modes",
2512                      parse_branch_stack),
2513         OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
2514                     "sample by weight (on special events only)"),
2515         OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
2516                     "sample transaction flags (special events only)"),
2517         OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
2518                     "use per-thread mmaps"),
2519         OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
2520                     "sample selected machine registers on interrupt,"
2521                     " use '-I?' to list register names", parse_intr_regs),
2522         OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
2523                     "sample selected machine registers on interrupt,"
2524                     " use '--user-regs=?' to list register names", parse_user_regs),
2525         OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
2526                     "Record running/enabled time of read (:S) events"),
2527         OPT_CALLBACK('k', "clockid", &record.opts,
2528         "clockid", "clockid to use for events, see clock_gettime()",
2529         parse_clockid),
2530         OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
2531                           "opts", "AUX area tracing Snapshot Mode", ""),
2532         OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts,
2533                           "opts", "sample AUX area", ""),
2534         OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
2535                         "per thread proc mmap processing timeout in ms"),
2536         OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
2537                     "Record namespaces events"),
2538         OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
2539                     "Record cgroup events"),
2540         OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events,
2541                         &record.opts.record_switch_events_set,
2542                         "Record context switch events"),
2543         OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
2544                          "Configure all used events to run in kernel space.",
2545                          PARSE_OPT_EXCLUSIVE),
2546         OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
2547                          "Configure all used events to run in user space.",
2548                          PARSE_OPT_EXCLUSIVE),
2549         OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
2550                     "collect kernel callchains"),
2551         OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
2552                     "collect user callchains"),
2553         OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
2554                    "clang binary to use for compiling BPF scriptlets"),
2555         OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
2556                    "options passed to clang when compiling BPF scriptlets"),
2557         OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
2558                    "file", "vmlinux pathname"),
2559         OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
2560                     "Record build-id of all DSOs regardless of hits"),
2561         OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
2562                     "append timestamp to output filename"),
2563         OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
2564                     "Record timestamp boundary (time of first/last samples)"),
2565         OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
2566                           &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
2567                           "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
2568                           "signal"),
2569         OPT_CALLBACK_SET(0, "switch-output-event", &record.sb_evlist, &record.switch_output_event_set, "switch output event",
2570                          "switch output event selector. use 'perf list' to list available events",
2571                          parse_events_option_new_evlist),
2572         OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
2573                    "Limit number of switch output generated files"),
2574         OPT_BOOLEAN(0, "dry-run", &dry_run,
2575                     "Parse options then exit"),
2576 #ifdef HAVE_AIO_SUPPORT
2577         OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
2578                      &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
2579                      record__aio_parse),
2580 #endif
2581         OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
2582                      "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
2583                      record__parse_affinity),
2584 #ifdef HAVE_ZSTD_SUPPORT
2585         OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default,
2586                             "n", "Compressed records using specified level (default: 1 - fastest compression, 22 - greatest compression)",
2587                             record__parse_comp_level),
2588 #endif
2589         OPT_CALLBACK(0, "max-size", &record.output_max_size,
2590                      "size", "Limit the maximum size of the output file", parse_output_max_size),
2591         OPT_UINTEGER(0, "num-thread-synthesize",
2592                      &record.opts.nr_threads_synthesize,
2593                      "number of threads to run for event synthesis"),
2594 #ifdef HAVE_LIBPFM
2595         OPT_CALLBACK(0, "pfm-events", &record.evlist, "event",
2596                 "libpfm4 event selector. use 'perf list' to list available events",
2597                 parse_libpfm_events_option),
2598 #endif
2599         OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd]",
2600                      "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events).\n"
2601                      "\t\t\t  Optionally send control command completion ('ack\\n') to ack-fd descriptor.",
2602                       parse_control_option),
2603         OPT_END()
2604 };
2605
2606 struct option *record_options = __record_options;
2607
2608 int cmd_record(int argc, const char **argv)
2609 {
2610         int err;
2611         struct record *rec = &record;
2612         char errbuf[BUFSIZ];
2613
2614         setlocale(LC_ALL, "");
2615
2616 #ifndef HAVE_LIBBPF_SUPPORT
2617 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c)
2618         set_nobuild('\0', "clang-path", true);
2619         set_nobuild('\0', "clang-opt", true);
2620 # undef set_nobuild
2621 #endif
2622
2623 #ifndef HAVE_BPF_PROLOGUE
2624 # if !defined (HAVE_DWARF_SUPPORT)
2625 #  define REASON  "NO_DWARF=1"
2626 # elif !defined (HAVE_LIBBPF_SUPPORT)
2627 #  define REASON  "NO_LIBBPF=1"
2628 # else
2629 #  define REASON  "this architecture doesn't support BPF prologue"
2630 # endif
2631 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
2632         set_nobuild('\0', "vmlinux", true);
2633 # undef set_nobuild
2634 # undef REASON
2635 #endif
2636
2637         rec->opts.affinity = PERF_AFFINITY_SYS;
2638
2639         rec->evlist = evlist__new();
2640         if (rec->evlist == NULL)
2641                 return -ENOMEM;
2642
2643         err = perf_config(perf_record_config, rec);
2644         if (err)
2645                 return err;
2646
2647         argc = parse_options(argc, argv, record_options, record_usage,
2648                             PARSE_OPT_STOP_AT_NON_OPTION);
2649         if (quiet)
2650                 perf_quiet_option();
2651
2652         /* Make system wide (-a) the default target. */
2653         if (!argc && target__none(&rec->opts.target))
2654                 rec->opts.target.system_wide = true;
2655
2656         if (nr_cgroups && !rec->opts.target.system_wide) {
2657                 usage_with_options_msg(record_usage, record_options,
2658                         "cgroup monitoring only available in system-wide mode");
2659
2660         }
2661
2662         if (rec->opts.kcore)
2663                 rec->data.is_dir = true;
2664
2665         if (rec->opts.comp_level != 0) {
2666                 pr_debug("Compression enabled, disabling build id collection at the end of the session.\n");
2667                 rec->no_buildid = true;
2668         }
2669
2670         if (rec->opts.record_switch_events &&
2671             !perf_can_record_switch_events()) {
2672                 ui__error("kernel does not support recording context switch events\n");
2673                 parse_options_usage(record_usage, record_options, "switch-events", 0);
2674                 return -EINVAL;
2675         }
2676
2677         if (switch_output_setup(rec)) {
2678                 parse_options_usage(record_usage, record_options, "switch-output", 0);
2679                 return -EINVAL;
2680         }
2681
2682         if (rec->switch_output.time) {
2683                 signal(SIGALRM, alarm_sig_handler);
2684                 alarm(rec->switch_output.time);
2685         }
2686
2687         if (rec->switch_output.num_files) {
2688                 rec->switch_output.filenames = calloc(sizeof(char *),
2689                                                       rec->switch_output.num_files);
2690                 if (!rec->switch_output.filenames)
2691                         return -EINVAL;
2692         }
2693
2694         /*
2695          * Allow aliases to facilitate the lookup of symbols for address
2696          * filters. Refer to auxtrace_parse_filters().
2697          */
2698         symbol_conf.allow_aliases = true;
2699
2700         symbol__init(NULL);
2701
2702         if (rec->opts.affinity != PERF_AFFINITY_SYS) {
2703                 rec->affinity_mask.nbits = cpu__max_cpu();
2704                 rec->affinity_mask.bits = bitmap_alloc(rec->affinity_mask.nbits);
2705                 if (!rec->affinity_mask.bits) {
2706                         pr_err("Failed to allocate thread mask for %zd cpus\n", rec->affinity_mask.nbits);
2707                         return -ENOMEM;
2708                 }
2709                 pr_debug2("thread mask[%zd]: empty\n", rec->affinity_mask.nbits);
2710         }
2711
2712         err = record__auxtrace_init(rec);
2713         if (err)
2714                 goto out;
2715
2716         if (dry_run)
2717                 goto out;
2718
2719         err = bpf__setup_stdout(rec->evlist);
2720         if (err) {
2721                 bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf));
2722                 pr_err("ERROR: Setup BPF stdout failed: %s\n",
2723                          errbuf);
2724                 goto out;
2725         }
2726
2727         err = -ENOMEM;
2728
2729         if (rec->no_buildid_cache || rec->no_buildid) {
2730                 disable_buildid_cache();
2731         } else if (rec->switch_output.enabled) {
2732                 /*
2733                  * In 'perf record --switch-output', disable buildid
2734                  * generation by default to reduce data file switching
2735                  * overhead. Still generate buildid if they are required
2736                  * explicitly using
2737                  *
2738                  *  perf record --switch-output --no-no-buildid \
2739                  *              --no-no-buildid-cache
2740                  *
2741                  * Following code equals to:
2742                  *
2743                  * if ((rec->no_buildid || !rec->no_buildid_set) &&
2744                  *     (rec->no_buildid_cache || !rec->no_buildid_cache_set))
2745                  *         disable_buildid_cache();
2746                  */
2747                 bool disable = true;
2748
2749                 if (rec->no_buildid_set && !rec->no_buildid)
2750                         disable = false;
2751                 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
2752                         disable = false;
2753                 if (disable) {
2754                         rec->no_buildid = true;
2755                         rec->no_buildid_cache = true;
2756                         disable_buildid_cache();
2757                 }
2758         }
2759
2760         if (record.opts.overwrite)
2761                 record.opts.tail_synthesize = true;
2762
2763         if (rec->evlist->core.nr_entries == 0 &&
2764             __evlist__add_default(rec->evlist, !record.opts.no_samples) < 0) {
2765                 pr_err("Not enough memory for event selector list\n");
2766                 goto out;
2767         }
2768
2769         if (rec->opts.target.tid && !rec->opts.no_inherit_set)
2770                 rec->opts.no_inherit = true;
2771
2772         err = target__validate(&rec->opts.target);
2773         if (err) {
2774                 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2775                 ui__warning("%s\n", errbuf);
2776         }
2777
2778         err = target__parse_uid(&rec->opts.target);
2779         if (err) {
2780                 int saved_errno = errno;
2781
2782                 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2783                 ui__error("%s", errbuf);
2784
2785                 err = -saved_errno;
2786                 goto out;
2787         }
2788
2789         /* Enable ignoring missing threads when -u/-p option is defined. */
2790         rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
2791
2792         err = -ENOMEM;
2793         if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
2794                 usage_with_options(record_usage, record_options);
2795
2796         err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
2797         if (err)
2798                 goto out;
2799
2800         /*
2801          * We take all buildids when the file contains
2802          * AUX area tracing data because we do not decode the
2803          * trace because it would take too long.
2804          */
2805         if (rec->opts.full_auxtrace)
2806                 rec->buildid_all = true;
2807
2808         if (rec->opts.text_poke) {
2809                 err = record__config_text_poke(rec->evlist);
2810                 if (err) {
2811                         pr_err("record__config_text_poke failed, error %d\n", err);
2812                         goto out;
2813                 }
2814         }
2815
2816         if (record_opts__config(&rec->opts)) {
2817                 err = -EINVAL;
2818                 goto out;
2819         }
2820
2821         if (rec->opts.nr_cblocks > nr_cblocks_max)
2822                 rec->opts.nr_cblocks = nr_cblocks_max;
2823         pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
2824
2825         pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
2826         pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);
2827
2828         if (rec->opts.comp_level > comp_level_max)
2829                 rec->opts.comp_level = comp_level_max;
2830         pr_debug("comp level: %d\n", rec->opts.comp_level);
2831
2832         err = __cmd_record(&record, argc, argv);
2833 out:
2834         bitmap_free(rec->affinity_mask.bits);
2835         evlist__delete(rec->evlist);
2836         symbol__exit();
2837         auxtrace_record__free(rec->itr);
2838         return err;
2839 }
2840
2841 static void snapshot_sig_handler(int sig __maybe_unused)
2842 {
2843         struct record *rec = &record;
2844
2845         if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
2846                 trigger_hit(&auxtrace_snapshot_trigger);
2847                 auxtrace_record__snapshot_started = 1;
2848                 if (auxtrace_record__snapshot_start(record.itr))
2849                         trigger_error(&auxtrace_snapshot_trigger);
2850         }
2851
2852         if (switch_output_signal(rec))
2853                 trigger_hit(&switch_output_trigger);
2854 }
2855
2856 static void alarm_sig_handler(int sig __maybe_unused)
2857 {
2858         struct record *rec = &record;
2859
2860         if (switch_output_time(rec))
2861                 trigger_hit(&switch_output_trigger);
2862 }