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 "util/pmu-hybrid.h"
  51 #include "util/evlist-hybrid.h"
  52 #include "asm/bug.h"
  53 #include "perf.h"
  54
  55 #include <errno.h>
  56 #include <inttypes.h>
  57 #include <locale.h>
  58 #include <poll.h>
  59 #include <pthread.h>
  60 #include <unistd.h>
  61 #include <sched.h>
  62 #include <signal.h>
  63 #ifdef HAVE_EVENTFD_SUPPORT
  64 #include <sys/eventfd.h>
  65 #endif
  66 #include <sys/mman.h>
  67 #include <sys/wait.h>
  68 #include <sys/types.h>
  69 #include <sys/stat.h>
  70 #include <fcntl.h>
  71 #include <linux/err.h>
  72 #include <linux/string.h>
  73 #include <linux/time64.h>
  74 #include <linux/zalloc.h>
  75 #include <linux/bitmap.h>
  76 #include <sys/time.h>
  77
  78 struct switch_output {
  79         bool             enabled;
  80         bool             signal;
  81         unsigned long    size;
  82         unsigned long    time;
  83         const char      *str;
  84         bool             set;
  85         char             **filenames;
  86         int              num_files;
  87         int              cur_file;
  88 };
  89
  90 struct record {
  91         struct perf_tool        tool;
  92         struct record_opts      opts;
  93         u64                     bytes_written;
  94         struct perf_data        data;
  95         struct auxtrace_record  *itr;
  96         struct evlist   *evlist;
  97         struct perf_session     *session;
  98         struct evlist           *sb_evlist;
  99         pthread_t               thread_id;
 100         int                     realtime_prio;
 101         bool                    switch_output_event_set;
 102         bool                    no_buildid;
 103         bool                    no_buildid_set;
 104         bool                    no_buildid_cache;
 105         bool                    no_buildid_cache_set;
 106         bool                    buildid_all;
 107         bool                    buildid_mmap;
 108         bool                    timestamp_filename;
 109         bool                    timestamp_boundary;
 110         struct switch_output    switch_output;
 111         unsigned long long      samples;
 112         struct mmap_cpu_mask    affinity_mask;
 113         unsigned long           output_max_size;        /* = 0: unlimited */
 114 };
 115
 116 static volatile int done;
 117
 118 static volatile int auxtrace_record__snapshot_started;
 119 static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
 120 static DEFINE_TRIGGER(switch_output_trigger);
 121
 122 static const char *affinity_tags[PERF_AFFINITY_MAX] = {
 123         "SYS", "NODE", "CPU"
 124 };
 125
 126 static bool switch_output_signal(struct record *rec)
 127 {
 128         return rec->switch_output.signal &&
 129                trigger_is_ready(&switch_output_trigger);
 130 }
 131
 132 static bool switch_output_size(struct record *rec)
 133 {
 134         return rec->switch_output.size &&
 135                trigger_is_ready(&switch_output_trigger) &&
 136                (rec->bytes_written >= rec->switch_output.size);
 137 }
 138
 139 static bool switch_output_time(struct record *rec)
 140 {
 141         return rec->switch_output.time &&
 142                trigger_is_ready(&switch_output_trigger);
 143 }
 144
 145 static bool record__output_max_size_exceeded(struct record *rec)
 146 {
 147         return rec->output_max_size &&
 148                (rec->bytes_written >= rec->output_max_size);
 149 }
 150
 151 static int record__write(struct record *rec, struct mmap *map __maybe_unused,
 152                          void *bf, size_t size)
 153 {
 154         struct perf_data_file *file = &rec->session->data->file;
 155
 156         if (perf_data_file__write(file, bf, size) < 0) {
 157                 pr_err("failed to write perf data, error: %m\n");
 158                 return -1;
 159         }
 160
 161         rec->bytes_written += size;
 162
 163         if (record__output_max_size_exceeded(rec) && !done) {
 164                 fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB),"
 165                                 " stopping session ]\n",
 166                                 rec->bytes_written >> 10);
 167                 done = 1;
 168         }
 169
 170         if (switch_output_size(rec))
 171                 trigger_hit(&switch_output_trigger);
 172
 173         return 0;
 174 }
 175
 176 static int record__aio_enabled(struct record *rec);
 177 static int record__comp_enabled(struct record *rec);
 178 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
 179                             void *src, size_t src_size);
 180
 181 #ifdef HAVE_AIO_SUPPORT
 182 static int record__aio_write(struct aiocb *cblock, int trace_fd,
 183                 void *buf, size_t size, off_t off)
 184 {
 185         int rc;
 186
 187         cblock->aio_fildes = trace_fd;
 188         cblock->aio_buf    = buf;
 189         cblock->aio_nbytes = size;
 190         cblock->aio_offset = off;
 191         cblock->aio_sigevent.sigev_notify = SIGEV_NONE;
 192
 193         do {
 194                 rc = aio_write(cblock);
 195                 if (rc == 0) {
 196                         break;
 197                 } else if (errno != EAGAIN) {
 198                         cblock->aio_fildes = -1;
 199                         pr_err("failed to queue perf data, error: %m\n");
 200                         break;
 201                 }
 202         } while (1);
 203
 204         return rc;
 205 }
 206
 207 static int record__aio_complete(struct mmap *md, struct aiocb *cblock)
 208 {
 209         void *rem_buf;
 210         off_t rem_off;
 211         size_t rem_size;
 212         int rc, aio_errno;
 213         ssize_t aio_ret, written;
 214
 215         aio_errno = aio_error(cblock);
 216         if (aio_errno == EINPROGRESS)
 217                 return 0;
 218
 219         written = aio_ret = aio_return(cblock);
 220         if (aio_ret < 0) {
 221                 if (aio_errno != EINTR)
 222                         pr_err("failed to write perf data, error: %m\n");
 223                 written = 0;
 224         }
 225
 226         rem_size = cblock->aio_nbytes - written;
 227
 228         if (rem_size == 0) {
 229                 cblock->aio_fildes = -1;
 230                 /*
 231                  * md->refcount is incremented in record__aio_pushfn() for
 232                  * every aio write request started in record__aio_push() so
 233                  * decrement it because the request is now complete.
 234                  */
 235                 perf_mmap__put(&md->core);
 236                 rc = 1;
 237         } else {
 238                 /*
 239                  * aio write request may require restart with the
 240                  * reminder if the kernel didn't write whole
 241                  * chunk at once.
 242                  */
 243                 rem_off = cblock->aio_offset + written;
 244                 rem_buf = (void *)(cblock->aio_buf + written);
 245                 record__aio_write(cblock, cblock->aio_fildes,
 246                                 rem_buf, rem_size, rem_off);
 247                 rc = 0;
 248         }
 249
 250         return rc;
 251 }
 252
 253 static int record__aio_sync(struct mmap *md, bool sync_all)
 254 {
 255         struct aiocb **aiocb = md->aio.aiocb;
 256         struct aiocb *cblocks = md->aio.cblocks;
 257         struct timespec timeout = { 0, 1000 * 1000  * 1 }; /* 1ms */
 258         int i, do_suspend;
 259
 260         do {
 261                 do_suspend = 0;
 262                 for (i = 0; i < md->aio.nr_cblocks; ++i) {
 263                         if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) {
 264                                 if (sync_all)
 265                                         aiocb[i] = NULL;
 266                                 else
 267                                         return i;
 268                         } else {
 269                                 /*
 270                                  * Started aio write is not complete yet
 271                                  * so it has to be waited before the
 272                                  * next allocation.
 273                                  */
 274                                 aiocb[i] = &cblocks[i];
 275                                 do_suspend = 1;
 276                         }
 277                 }
 278                 if (!do_suspend)
 279                         return -1;
 280
 281                 while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) {
 282                         if (!(errno == EAGAIN || errno == EINTR))
 283                                 pr_err("failed to sync perf data, error: %m\n");
 284                 }
 285         } while (1);
 286 }
 287
 288 struct record_aio {
 289         struct record   *rec;
 290         void            *data;
 291         size_t          size;
 292 };
 293
 294 static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size)
 295 {
 296         struct record_aio *aio = to;
 297
 298         /*
 299          * map->core.base data pointed by buf is copied into free map->aio.data[] buffer
 300          * to release space in the kernel buffer as fast as possible, calling
 301          * perf_mmap__consume() from perf_mmap__push() function.
 302          *
 303          * That lets the kernel to proceed with storing more profiling data into
 304          * the kernel buffer earlier than other per-cpu kernel buffers are handled.
 305          *
 306          * Coping can be done in two steps in case the chunk of profiling data
 307          * crosses the upper bound of the kernel buffer. In this case we first move
 308          * part of data from map->start till the upper bound and then the reminder
 309          * from the beginning of the kernel buffer till the end of the data chunk.
 310          */
 311
 312         if (record__comp_enabled(aio->rec)) {
 313                 size = zstd_compress(aio->rec->session, aio->data + aio->size,
 314                                      mmap__mmap_len(map) - aio->size,
 315                                      buf, size);
 316         } else {
 317                 memcpy(aio->data + aio->size, buf, size);
 318         }
 319
 320         if (!aio->size) {
 321                 /*
 322                  * Increment map->refcount to guard map->aio.data[] buffer
 323                  * from premature deallocation because map object can be
 324                  * released earlier than aio write request started on
 325                  * map->aio.data[] buffer is complete.
 326                  *
 327                  * perf_mmap__put() is done at record__aio_complete()
 328                  * after started aio request completion or at record__aio_push()
 329                  * if the request failed to start.
 330                  */
 331                 perf_mmap__get(&map->core);
 332         }
 333
 334         aio->size += size;
 335
 336         return size;
 337 }
 338
 339 static int record__aio_push(struct record *rec, struct mmap *map, off_t *off)
 340 {
 341         int ret, idx;
 342         int trace_fd = rec->session->data->file.fd;
 343         struct record_aio aio = { .rec = rec, .size = 0 };
 344
 345         /*
 346          * Call record__aio_sync() to wait till map->aio.data[] buffer
 347          * becomes available after previous aio write operation.
 348          */
 349
 350         idx = record__aio_sync(map, false);
 351         aio.data = map->aio.data[idx];
 352         ret = perf_mmap__push(map, &aio, record__aio_pushfn);
 353         if (ret != 0) /* ret > 0 - no data, ret < 0 - error */
 354                 return ret;
 355
 356         rec->samples++;
 357         ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off);
 358         if (!ret) {
 359                 *off += aio.size;
 360                 rec->bytes_written += aio.size;
 361                 if (switch_output_size(rec))
 362                         trigger_hit(&switch_output_trigger);
 363         } else {
 364                 /*
 365                  * Decrement map->refcount incremented in record__aio_pushfn()
 366                  * back if record__aio_write() operation failed to start, otherwise
 367                  * map->refcount is decremented in record__aio_complete() after
 368                  * aio write operation finishes successfully.
 369                  */
 370                 perf_mmap__put(&map->core);
 371         }
 372
 373         return ret;
 374 }
 375
 376 static off_t record__aio_get_pos(int trace_fd)
 377 {
 378         return lseek(trace_fd, 0, SEEK_CUR);
 379 }
 380
 381 static void record__aio_set_pos(int trace_fd, off_t pos)
 382 {
 383         lseek(trace_fd, pos, SEEK_SET);
 384 }
 385
 386 static void record__aio_mmap_read_sync(struct record *rec)
 387 {
 388         int i;
 389         struct evlist *evlist = rec->evlist;
 390         struct mmap *maps = evlist->mmap;
 391
 392         if (!record__aio_enabled(rec))
 393                 return;
 394
 395         for (i = 0; i < evlist->core.nr_mmaps; i++) {
 396                 struct mmap *map = &maps[i];
 397
 398                 if (map->core.base)
 399                         record__aio_sync(map, true);
 400         }
 401 }
 402
 403 static int nr_cblocks_default = 1;
 404 static int nr_cblocks_max = 4;
 405
 406 static int record__aio_parse(const struct option *opt,
 407                              const char *str,
 408                              int unset)
 409 {
 410         struct record_opts *opts = (struct record_opts *)opt->value;
 411
 412         if (unset) {
 413                 opts->nr_cblocks = 0;
 414         } else {
 415                 if (str)
 416                         opts->nr_cblocks = strtol(str, NULL, 0);
 417                 if (!opts->nr_cblocks)
 418                         opts->nr_cblocks = nr_cblocks_default;
 419         }
 420
 421         return 0;
 422 }
 423 #else /* HAVE_AIO_SUPPORT */
 424 static int nr_cblocks_max = 0;
 425
 426 static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused,
 427                             off_t *off __maybe_unused)
 428 {
 429         return -1;
 430 }
 431
 432 static off_t record__aio_get_pos(int trace_fd __maybe_unused)
 433 {
 434         return -1;
 435 }
 436
 437 static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused)
 438 {
 439 }
 440
 441 static void record__aio_mmap_read_sync(struct record *rec __maybe_unused)
 442 {
 443 }
 444 #endif
 445
 446 static int record__aio_enabled(struct record *rec)
 447 {
 448         return rec->opts.nr_cblocks > 0;
 449 }
 450
 451 #define MMAP_FLUSH_DEFAULT 1
 452 static int record__mmap_flush_parse(const struct option *opt,
 453                                     const char *str,
 454                                     int unset)
 455 {
 456         int flush_max;
 457         struct record_opts *opts = (struct record_opts *)opt->value;
 458         static struct parse_tag tags[] = {
 459                         { .tag  = 'B', .mult = 1       },
 460                         { .tag  = 'K', .mult = 1 << 10 },
 461                         { .tag  = 'M', .mult = 1 << 20 },
 462                         { .tag  = 'G', .mult = 1 << 30 },
 463                         { .tag  = 0 },
 464         };
 465
 466         if (unset)
 467                 return 0;
 468
 469         if (str) {
 470                 opts->mmap_flush = parse_tag_value(str, tags);
 471                 if (opts->mmap_flush == (int)-1)
 472                         opts->mmap_flush = strtol(str, NULL, 0);
 473         }
 474
 475         if (!opts->mmap_flush)
 476                 opts->mmap_flush = MMAP_FLUSH_DEFAULT;
 477
 478         flush_max = evlist__mmap_size(opts->mmap_pages);
 479         flush_max /= 4;
 480         if (opts->mmap_flush > flush_max)
 481                 opts->mmap_flush = flush_max;
 482
 483         return 0;
 484 }
 485
 486 #ifdef HAVE_ZSTD_SUPPORT
 487 static unsigned int comp_level_default = 1;
 488
 489 static int record__parse_comp_level(const struct option *opt, const char *str, int unset)
 490 {
 491         struct record_opts *opts = opt->value;
 492
 493         if (unset) {
 494                 opts->comp_level = 0;
 495         } else {
 496                 if (str)
 497                         opts->comp_level = strtol(str, NULL, 0);
 498                 if (!opts->comp_level)
 499                         opts->comp_level = comp_level_default;
 500         }
 501
 502         return 0;
 503 }
 504 #endif
 505 static unsigned int comp_level_max = 22;
 506
 507 static int record__comp_enabled(struct record *rec)
 508 {
 509         return rec->opts.comp_level > 0;
 510 }
 511
 512 static int process_synthesized_event(struct perf_tool *tool,
 513                                      union perf_event *event,
 514                                      struct perf_sample *sample __maybe_unused,
 515                                      struct machine *machine __maybe_unused)
 516 {
 517         struct record *rec = container_of(tool, struct record, tool);
 518         return record__write(rec, NULL, event, event->header.size);
 519 }
 520
 521 static int process_locked_synthesized_event(struct perf_tool *tool,
 522                                      union perf_event *event,
 523                                      struct perf_sample *sample __maybe_unused,
 524                                      struct machine *machine __maybe_unused)
 525 {
 526         static pthread_mutex_t synth_lock = PTHREAD_MUTEX_INITIALIZER;
 527         int ret;
 528
 529         pthread_mutex_lock(&synth_lock);
 530         ret = process_synthesized_event(tool, event, sample, machine);
 531         pthread_mutex_unlock(&synth_lock);
 532         return ret;
 533 }
 534
 535 static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
 536 {
 537         struct record *rec = to;
 538
 539         if (record__comp_enabled(rec)) {
 540                 size = zstd_compress(rec->session, map->data, mmap__mmap_len(map), bf, size);
 541                 bf   = map->data;
 542         }
 543
 544         rec->samples++;
 545         return record__write(rec, map, bf, size);
 546 }
 547
 548 static volatile int signr = -1;
 549 static volatile int child_finished;
 550 #ifdef HAVE_EVENTFD_SUPPORT
 551 static int done_fd = -1;
 552 #endif
 553
 554 static void sig_handler(int sig)
 555 {
 556         if (sig == SIGCHLD)
 557                 child_finished = 1;
 558         else
 559                 signr = sig;
 560
 561         done = 1;
 562 #ifdef HAVE_EVENTFD_SUPPORT
 563 {
 564         u64 tmp = 1;
 565         /*
 566          * It is possible for this signal handler to run after done is checked
 567          * in the main loop, but before the perf counter fds are polled. If this
 568          * happens, the poll() will continue to wait even though done is set,
 569          * and will only break out if either another signal is received, or the
 570          * counters are ready for read. To ensure the poll() doesn't sleep when
 571          * done is set, use an eventfd (done_fd) to wake up the poll().
 572          */
 573         if (write(done_fd, &tmp, sizeof(tmp)) < 0)
 574                 pr_err("failed to signal wakeup fd, error: %m\n");
 575 }
 576 #endif // HAVE_EVENTFD_SUPPORT
 577 }
 578
 579 static void sigsegv_handler(int sig)
 580 {
 581         perf_hooks__recover();
 582         sighandler_dump_stack(sig);
 583 }
 584
 585 static void record__sig_exit(void)
 586 {
 587         if (signr == -1)
 588                 return;
 589
 590         signal(signr, SIG_DFL);
 591         raise(signr);
 592 }
 593
 594 #ifdef HAVE_AUXTRACE_SUPPORT
 595
 596 static int record__process_auxtrace(struct perf_tool *tool,
 597                                     struct mmap *map,
 598                                     union perf_event *event, void *data1,
 599                                     size_t len1, void *data2, size_t len2)
 600 {
 601         struct record *rec = container_of(tool, struct record, tool);
 602         struct perf_data *data = &rec->data;
 603         size_t padding;
 604         u8 pad[8] = {0};
 605
 606         if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) {
 607                 off_t file_offset;
 608                 int fd = perf_data__fd(data);
 609                 int err;
 610
 611                 file_offset = lseek(fd, 0, SEEK_CUR);
 612                 if (file_offset == -1)
 613                         return -1;
 614                 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
 615                                                      event, file_offset);
 616                 if (err)
 617                         return err;
 618         }
 619
 620         /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
 621         padding = (len1 + len2) & 7;
 622         if (padding)
 623                 padding = 8 - padding;
 624
 625         record__write(rec, map, event, event->header.size);
 626         record__write(rec, map, data1, len1);
 627         if (len2)
 628                 record__write(rec, map, data2, len2);
 629         record__write(rec, map, &pad, padding);
 630
 631         return 0;
 632 }
 633
 634 static int record__auxtrace_mmap_read(struct record *rec,
 635                                       struct mmap *map)
 636 {
 637         int ret;
 638
 639         ret = auxtrace_mmap__read(map, rec->itr, &rec->tool,
 640                                   record__process_auxtrace);
 641         if (ret < 0)
 642                 return ret;
 643
 644         if (ret)
 645                 rec->samples++;
 646
 647         return 0;
 648 }
 649
 650 static int record__auxtrace_mmap_read_snapshot(struct record *rec,
 651                                                struct mmap *map)
 652 {
 653         int ret;
 654
 655         ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool,
 656                                            record__process_auxtrace,
 657                                            rec->opts.auxtrace_snapshot_size);
 658         if (ret < 0)
 659                 return ret;
 660
 661         if (ret)
 662                 rec->samples++;
 663
 664         return 0;
 665 }
 666
 667 static int record__auxtrace_read_snapshot_all(struct record *rec)
 668 {
 669         int i;
 670         int rc = 0;
 671
 672         for (i = 0; i < rec->evlist->core.nr_mmaps; i++) {
 673                 struct mmap *map = &rec->evlist->mmap[i];
 674
 675                 if (!map->auxtrace_mmap.base)
 676                         continue;
 677
 678                 if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) {
 679                         rc = -1;
 680                         goto out;
 681                 }
 682         }
 683 out:
 684         return rc;
 685 }
 686
 687 static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit)
 688 {
 689         pr_debug("Recording AUX area tracing snapshot\n");
 690         if (record__auxtrace_read_snapshot_all(rec) < 0) {
 691                 trigger_error(&auxtrace_snapshot_trigger);
 692         } else {
 693                 if (auxtrace_record__snapshot_finish(rec->itr, on_exit))
 694                         trigger_error(&auxtrace_snapshot_trigger);
 695                 else
 696                         trigger_ready(&auxtrace_snapshot_trigger);
 697         }
 698 }
 699
 700 static int record__auxtrace_snapshot_exit(struct record *rec)
 701 {
 702         if (trigger_is_error(&auxtrace_snapshot_trigger))
 703                 return 0;
 704
 705         if (!auxtrace_record__snapshot_started &&
 706             auxtrace_record__snapshot_start(rec->itr))
 707                 return -1;
 708
 709         record__read_auxtrace_snapshot(rec, true);
 710         if (trigger_is_error(&auxtrace_snapshot_trigger))
 711                 return -1;
 712
 713         return 0;
 714 }
 715
 716 static int record__auxtrace_init(struct record *rec)
 717 {
 718         int err;
 719
 720         if (!rec->itr) {
 721                 rec->itr = auxtrace_record__init(rec->evlist, &err);
 722                 if (err)
 723                         return err;
 724         }
 725
 726         err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
 727                                               rec->opts.auxtrace_snapshot_opts);
 728         if (err)
 729                 return err;
 730
 731         err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts,
 732                                             rec->opts.auxtrace_sample_opts);
 733         if (err)
 734                 return err;
 735
 736         auxtrace_regroup_aux_output(rec->evlist);
 737
 738         return auxtrace_parse_filters(rec->evlist);
 739 }
 740
 741 #else
 742
 743 static inline
 744 int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
 745                                struct mmap *map __maybe_unused)
 746 {
 747         return 0;
 748 }
 749
 750 static inline
 751 void record__read_auxtrace_snapshot(struct record *rec __maybe_unused,
 752                                     bool on_exit __maybe_unused)
 753 {
 754 }
 755
 756 static inline
 757 int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
 758 {
 759         return 0;
 760 }
 761
 762 static inline
 763 int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused)
 764 {
 765         return 0;
 766 }
 767
 768 static int record__auxtrace_init(struct record *rec __maybe_unused)
 769 {
 770         return 0;
 771 }
 772
 773 #endif
 774
 775 static int record__config_text_poke(struct evlist *evlist)
 776 {
 777         struct evsel *evsel;
 778         int err;
 779
 780         /* Nothing to do if text poke is already configured */
 781         evlist__for_each_entry(evlist, evsel) {
 782                 if (evsel->core.attr.text_poke)
 783                         return 0;
 784         }
 785
 786         err = parse_events(evlist, "dummy:u", NULL);
 787         if (err)
 788                 return err;
 789
 790         evsel = evlist__last(evlist);
 791
 792         evsel->core.attr.freq = 0;
 793         evsel->core.attr.sample_period = 1;
 794         evsel->core.attr.text_poke = 1;
 795         evsel->core.attr.ksymbol = 1;
 796
 797         evsel->core.system_wide = true;
 798         evsel->no_aux_samples = true;
 799         evsel->immediate = true;
 800
 801         /* Text poke must be collected on all CPUs */
 802         perf_cpu_map__put(evsel->core.own_cpus);
 803         evsel->core.own_cpus = perf_cpu_map__new(NULL);
 804         perf_cpu_map__put(evsel->core.cpus);
 805         evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus);
 806
 807         evsel__set_sample_bit(evsel, TIME);
 808
 809         return 0;
 810 }
 811
 812 static bool record__kcore_readable(struct machine *machine)
 813 {
 814         char kcore[PATH_MAX];
 815         int fd;
 816
 817         scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir);
 818
 819         fd = open(kcore, O_RDONLY);
 820         if (fd < 0)
 821                 return false;
 822
 823         close(fd);
 824
 825         return true;
 826 }
 827
 828 static int record__kcore_copy(struct machine *machine, struct perf_data *data)
 829 {
 830         char from_dir[PATH_MAX];
 831         char kcore_dir[PATH_MAX];
 832         int ret;
 833
 834         snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir);
 835
 836         ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir));
 837         if (ret)
 838                 return ret;
 839
 840         return kcore_copy(from_dir, kcore_dir);
 841 }
 842
 843 static int record__mmap_evlist(struct record *rec,
 844                                struct evlist *evlist)
 845 {
 846         struct record_opts *opts = &rec->opts;
 847         bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
 848                                   opts->auxtrace_sample_mode;
 849         char msg[512];
 850
 851         if (opts->affinity != PERF_AFFINITY_SYS)
 852                 cpu__setup_cpunode_map();
 853
 854         if (evlist__mmap_ex(evlist, opts->mmap_pages,
 855                                  opts->auxtrace_mmap_pages,
 856                                  auxtrace_overwrite,
 857                                  opts->nr_cblocks, opts->affinity,
 858                                  opts->mmap_flush, opts->comp_level) < 0) {
 859                 if (errno == EPERM) {
 860                         pr_err("Permission error mapping pages.\n"
 861                                "Consider increasing "
 862                                "/proc/sys/kernel/perf_event_mlock_kb,\n"
 863                                "or try again with a smaller value of -m/--mmap_pages.\n"
 864                                "(current value: %u,%u)\n",
 865                                opts->mmap_pages, opts->auxtrace_mmap_pages);
 866                         return -errno;
 867                 } else {
 868                         pr_err("failed to mmap with %d (%s)\n", errno,
 869                                 str_error_r(errno, msg, sizeof(msg)));
 870                         if (errno)
 871                                 return -errno;
 872                         else
 873                                 return -EINVAL;
 874                 }
 875         }
 876         return 0;
 877 }
 878
 879 static int record__mmap(struct record *rec)
 880 {
 881         return record__mmap_evlist(rec, rec->evlist);
 882 }
 883
 884 static int record__open(struct record *rec)
 885 {
 886         char msg[BUFSIZ];
 887         struct evsel *pos;
 888         struct evlist *evlist = rec->evlist;
 889         struct perf_session *session = rec->session;
 890         struct record_opts *opts = &rec->opts;
 891         int rc = 0;
 892
 893         /*
 894          * For initial_delay, system wide or a hybrid system, we need to add a
 895          * dummy event so that we can track PERF_RECORD_MMAP to cover the delay
 896          * of waiting or event synthesis.
 897          */
 898         if (opts->initial_delay || target__has_cpu(&opts->target) ||
 899             perf_pmu__has_hybrid()) {
 900                 pos = evlist__get_tracking_event(evlist);
 901                 if (!evsel__is_dummy_event(pos)) {
 902                         /* Set up dummy event. */
 903                         if (evlist__add_dummy(evlist))
 904                                 return -ENOMEM;
 905                         pos = evlist__last(evlist);
 906                         evlist__set_tracking_event(evlist, pos);
 907                 }
 908
 909                 /*
 910                  * Enable the dummy event when the process is forked for
 911                  * initial_delay, immediately for system wide.
 912                  */
 913                 if (opts->initial_delay && !pos->immediate)
 914                         pos->core.attr.enable_on_exec = 1;
 915                 else
 916                         pos->immediate = 1;
 917         }
 918
 919         evlist__config(evlist, opts, &callchain_param);
 920
 921         evlist__for_each_entry(evlist, pos) {
 922 try_again:
 923                 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) {
 924                         if (evsel__fallback(pos, errno, msg, sizeof(msg))) {
 925                                 if (verbose > 0)
 926                                         ui__warning("%s\n", msg);
 927                                 goto try_again;
 928                         }
 929                         if ((errno == EINVAL || errno == EBADF) &&
 930                             pos->core.leader != &pos->core &&
 931                             pos->weak_group) {
 932                                 pos = evlist__reset_weak_group(evlist, pos, true);
 933                                 goto try_again;
 934                         }
 935                         rc = -errno;
 936                         evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg));
 937                         ui__error("%s\n", msg);
 938                         goto out;
 939                 }
 940
 941                 pos->supported = true;
 942         }
 943
 944         if (symbol_conf.kptr_restrict && !evlist__exclude_kernel(evlist)) {
 945                 pr_warning(
 946 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
 947 "check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
 948 "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
 949 "file is not found in the buildid cache or in the vmlinux path.\n\n"
 950 "Samples in kernel modules won't be resolved at all.\n\n"
 951 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
 952 "even with a suitable vmlinux or kallsyms file.\n\n");
 953         }
 954
 955         if (evlist__apply_filters(evlist, &pos)) {
 956                 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
 957                         pos->filter, evsel__name(pos), errno,
 958                         str_error_r(errno, msg, sizeof(msg)));
 959                 rc = -1;
 960                 goto out;
 961         }
 962
 963         rc = record__mmap(rec);
 964         if (rc)
 965                 goto out;
 966
 967         session->evlist = evlist;
 968         perf_session__set_id_hdr_size(session);
 969 out:
 970         return rc;
 971 }
 972
 973 static void set_timestamp_boundary(struct record *rec, u64 sample_time)
 974 {
 975         if (rec->evlist->first_sample_time == 0)
 976                 rec->evlist->first_sample_time = sample_time;
 977
 978         if (sample_time)
 979                 rec->evlist->last_sample_time = sample_time;
 980 }
 981
 982 static int process_sample_event(struct perf_tool *tool,
 983                                 union perf_event *event,
 984                                 struct perf_sample *sample,
 985                                 struct evsel *evsel,
 986                                 struct machine *machine)
 987 {
 988         struct record *rec = container_of(tool, struct record, tool);
 989
 990         set_timestamp_boundary(rec, sample->time);
 991
 992         if (rec->buildid_all)
 993                 return 0;
 994
 995         rec->samples++;
 996         return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
 997 }
 998
 999 static int process_buildids(struct record *rec)
1000 {
1001         struct perf_session *session = rec->session;
1002
1003         if (perf_data__size(&rec->data) == 0)
1004                 return 0;
1005
1006         /*
1007          * During this process, it'll load kernel map and replace the
1008          * dso->long_name to a real pathname it found.  In this case
1009          * we prefer the vmlinux path like
1010          *   /lib/modules/3.16.4/build/vmlinux
1011          *
1012          * rather than build-id path (in debug directory).
1013          *   $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
1014          */
1015         symbol_conf.ignore_vmlinux_buildid = true;
1016
1017         /*
1018          * If --buildid-all is given, it marks all DSO regardless of hits,
1019          * so no need to process samples. But if timestamp_boundary is enabled,
1020          * it still needs to walk on all samples to get the timestamps of
1021          * first/last samples.
1022          */
1023         if (rec->buildid_all && !rec->timestamp_boundary)
1024                 rec->tool.sample = NULL;
1025
1026         return perf_session__process_events(session);
1027 }
1028
1029 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
1030 {
1031         int err;
1032         struct perf_tool *tool = data;
1033         /*
1034          *As for guest kernel when processing subcommand record&report,
1035          *we arrange module mmap prior to guest kernel mmap and trigger
1036          *a preload dso because default guest module symbols are loaded
1037          *from guest kallsyms instead of /lib/modules/XXX/XXX. This
1038          *method is used to avoid symbol missing when the first addr is
1039          *in module instead of in guest kernel.
1040          */
1041         err = perf_event__synthesize_modules(tool, process_synthesized_event,
1042                                              machine);
1043         if (err < 0)
1044                 pr_err("Couldn't record guest kernel [%d]'s reference"
1045                        " relocation symbol.\n", machine->pid);
1046
1047         /*
1048          * We use _stext for guest kernel because guest kernel's /proc/kallsyms
1049          * have no _text sometimes.
1050          */
1051         err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1052                                                  machine);
1053         if (err < 0)
1054                 pr_err("Couldn't record guest kernel [%d]'s reference"
1055                        " relocation symbol.\n", machine->pid);
1056 }
1057
1058 static struct perf_event_header finished_round_event = {
1059         .size = sizeof(struct perf_event_header),
1060         .type = PERF_RECORD_FINISHED_ROUND,
1061 };
1062
1063 static void record__adjust_affinity(struct record *rec, struct mmap *map)
1064 {
1065         if (rec->opts.affinity != PERF_AFFINITY_SYS &&
1066             !bitmap_equal(rec->affinity_mask.bits, map->affinity_mask.bits,
1067                           rec->affinity_mask.nbits)) {
1068                 bitmap_zero(rec->affinity_mask.bits, rec->affinity_mask.nbits);
1069                 bitmap_or(rec->affinity_mask.bits, rec->affinity_mask.bits,
1070                           map->affinity_mask.bits, rec->affinity_mask.nbits);
1071                 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&rec->affinity_mask),
1072                                   (cpu_set_t *)rec->affinity_mask.bits);
1073                 if (verbose == 2)
1074                         mmap_cpu_mask__scnprintf(&rec->affinity_mask, "thread");
1075         }
1076 }
1077
1078 static size_t process_comp_header(void *record, size_t increment)
1079 {
1080         struct perf_record_compressed *event = record;
1081         size_t size = sizeof(*event);
1082
1083         if (increment) {
1084                 event->header.size += increment;
1085                 return increment;
1086         }
1087
1088         event->header.type = PERF_RECORD_COMPRESSED;
1089         event->header.size = size;
1090
1091         return size;
1092 }
1093
1094 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
1095                             void *src, size_t src_size)
1096 {
1097         size_t compressed;
1098         size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
1099
1100         compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size,
1101                                                      max_record_size, process_comp_header);
1102
1103         session->bytes_transferred += src_size;
1104         session->bytes_compressed  += compressed;
1105
1106         return compressed;
1107 }
1108
1109 static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
1110                                     bool overwrite, bool synch)
1111 {
1112         u64 bytes_written = rec->bytes_written;
1113         int i;
1114         int rc = 0;
1115         struct mmap *maps;
1116         int trace_fd = rec->data.file.fd;
1117         off_t off = 0;
1118
1119         if (!evlist)
1120                 return 0;
1121
1122         maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
1123         if (!maps)
1124                 return 0;
1125
1126         if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
1127                 return 0;
1128
1129         if (record__aio_enabled(rec))
1130                 off = record__aio_get_pos(trace_fd);
1131
1132         for (i = 0; i < evlist->core.nr_mmaps; i++) {
1133                 u64 flush = 0;
1134                 struct mmap *map = &maps[i];
1135
1136                 if (map->core.base) {
1137                         record__adjust_affinity(rec, map);
1138                         if (synch) {
1139                                 flush = map->core.flush;
1140                                 map->core.flush = 1;
1141                         }
1142                         if (!record__aio_enabled(rec)) {
1143                                 if (perf_mmap__push(map, rec, record__pushfn) < 0) {
1144                                         if (synch)
1145                                                 map->core.flush = flush;
1146                                         rc = -1;
1147                                         goto out;
1148                                 }
1149                         } else {
1150                                 if (record__aio_push(rec, map, &off) < 0) {
1151                                         record__aio_set_pos(trace_fd, off);
1152                                         if (synch)
1153                                                 map->core.flush = flush;
1154                                         rc = -1;
1155                                         goto out;
1156                                 }
1157                         }
1158                         if (synch)
1159                                 map->core.flush = flush;
1160                 }
1161
1162                 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
1163                     !rec->opts.auxtrace_sample_mode &&
1164                     record__auxtrace_mmap_read(rec, map) != 0) {
1165                         rc = -1;
1166                         goto out;
1167                 }
1168         }
1169
1170         if (record__aio_enabled(rec))
1171                 record__aio_set_pos(trace_fd, off);
1172
1173         /*
1174          * Mark the round finished in case we wrote
1175          * at least one event.
1176          */
1177         if (bytes_written != rec->bytes_written)
1178                 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));
1179
1180         if (overwrite)
1181                 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
1182 out:
1183         return rc;
1184 }
1185
1186 static int record__mmap_read_all(struct record *rec, bool synch)
1187 {
1188         int err;
1189
1190         err = record__mmap_read_evlist(rec, rec->evlist, false, synch);
1191         if (err)
1192                 return err;
1193
1194         return record__mmap_read_evlist(rec, rec->evlist, true, synch);
1195 }
1196
1197 static void record__init_features(struct record *rec)
1198 {
1199         struct perf_session *session = rec->session;
1200         int feat;
1201
1202         for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1203                 perf_header__set_feat(&session->header, feat);
1204
1205         if (rec->no_buildid)
1206                 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1207
1208         if (!have_tracepoints(&rec->evlist->core.entries))
1209                 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1210
1211         if (!rec->opts.branch_stack)
1212                 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1213
1214         if (!rec->opts.full_auxtrace)
1215                 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1216
1217         if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
1218                 perf_header__clear_feat(&session->header, HEADER_CLOCKID);
1219
1220         if (!rec->opts.use_clockid)
1221                 perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);
1222
1223         perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1224         if (!record__comp_enabled(rec))
1225                 perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
1226
1227         perf_header__clear_feat(&session->header, HEADER_STAT);
1228 }
1229
1230 static void
1231 record__finish_output(struct record *rec)
1232 {
1233         struct perf_data *data = &rec->data;
1234         int fd = perf_data__fd(data);
1235
1236         if (data->is_pipe)
1237                 return;
1238
1239         rec->session->header.data_size += rec->bytes_written;
1240         data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
1241
1242         if (!rec->no_buildid) {
1243                 process_buildids(rec);
1244
1245                 if (rec->buildid_all)
1246                         dsos__hit_all(rec->session);
1247         }
1248         perf_session__write_header(rec->session, rec->evlist, fd, true);
1249
1250         return;
1251 }
1252
1253 static int record__synthesize_workload(struct record *rec, bool tail)
1254 {
1255         int err;
1256         struct perf_thread_map *thread_map;
1257
1258         if (rec->opts.tail_synthesize != tail)
1259                 return 0;
1260
1261         thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
1262         if (thread_map == NULL)
1263                 return -1;
1264
1265         err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
1266                                                  process_synthesized_event,
1267                                                  &rec->session->machines.host,
1268                                                  rec->opts.sample_address);
1269         perf_thread_map__put(thread_map);
1270         return err;
1271 }
1272
1273 static int record__synthesize(struct record *rec, bool tail);
1274
1275 static int
1276 record__switch_output(struct record *rec, bool at_exit)
1277 {
1278         struct perf_data *data = &rec->data;
1279         int fd, err;
1280         char *new_filename;
1281
1282         /* Same Size:      "2015122520103046"*/
1283         char timestamp[] = "InvalidTimestamp";
1284
1285         record__aio_mmap_read_sync(rec);
1286
1287         record__synthesize(rec, true);
1288         if (target__none(&rec->opts.target))
1289                 record__synthesize_workload(rec, true);
1290
1291         rec->samples = 0;
1292         record__finish_output(rec);
1293         err = fetch_current_timestamp(timestamp, sizeof(timestamp));
1294         if (err) {
1295                 pr_err("Failed to get current timestamp\n");
1296                 return -EINVAL;
1297         }
1298
1299         fd = perf_data__switch(data, timestamp,
1300                                     rec->session->header.data_offset,
1301                                     at_exit, &new_filename);
1302         if (fd >= 0 && !at_exit) {
1303                 rec->bytes_written = 0;
1304                 rec->session->header.data_size = 0;
1305         }
1306
1307         if (!quiet)
1308                 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
1309                         data->path, timestamp);
1310
1311         if (rec->switch_output.num_files) {
1312                 int n = rec->switch_output.cur_file + 1;
1313
1314                 if (n >= rec->switch_output.num_files)
1315                         n = 0;
1316                 rec->switch_output.cur_file = n;
1317                 if (rec->switch_output.filenames[n]) {
1318                         remove(rec->switch_output.filenames[n]);
1319                         zfree(&rec->switch_output.filenames[n]);
1320                 }
1321                 rec->switch_output.filenames[n] = new_filename;
1322         } else {
1323                 free(new_filename);
1324         }
1325
1326         /* Output tracking events */
1327         if (!at_exit) {
1328                 record__synthesize(rec, false);
1329
1330                 /*
1331                  * In 'perf record --switch-output' without -a,
1332                  * record__synthesize() in record__switch_output() won't
1333                  * generate tracking events because there's no thread_map
1334                  * in evlist. Which causes newly created perf.data doesn't
1335                  * contain map and comm information.
1336                  * Create a fake thread_map and directly call
1337                  * perf_event__synthesize_thread_map() for those events.
1338                  */
1339                 if (target__none(&rec->opts.target))
1340                         record__synthesize_workload(rec, false);
1341         }
1342         return fd;
1343 }
1344
1345 static volatile int workload_exec_errno;
1346
1347 /*
1348  * evlist__prepare_workload will send a SIGUSR1
1349  * if the fork fails, since we asked by setting its
1350  * want_signal to true.
1351  */
1352 static void workload_exec_failed_signal(int signo __maybe_unused,
1353                                         siginfo_t *info,
1354                                         void *ucontext __maybe_unused)
1355 {
1356         workload_exec_errno = info->si_value.sival_int;
1357         done = 1;
1358         child_finished = 1;
1359 }
1360
1361 static void snapshot_sig_handler(int sig);
1362 static void alarm_sig_handler(int sig);
1363
1364 static const struct perf_event_mmap_page *evlist__pick_pc(struct evlist *evlist)
1365 {
1366         if (evlist) {
1367                 if (evlist->mmap && evlist->mmap[0].core.base)
1368                         return evlist->mmap[0].core.base;
1369                 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base)
1370                         return evlist->overwrite_mmap[0].core.base;
1371         }
1372         return NULL;
1373 }
1374
1375 static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
1376 {
1377         const struct perf_event_mmap_page *pc = evlist__pick_pc(rec->evlist);
1378         if (pc)
1379                 return pc;
1380         return NULL;
1381 }
1382
1383 static int record__synthesize(struct record *rec, bool tail)
1384 {
1385         struct perf_session *session = rec->session;
1386         struct machine *machine = &session->machines.host;
1387         struct perf_data *data = &rec->data;
1388         struct record_opts *opts = &rec->opts;
1389         struct perf_tool *tool = &rec->tool;
1390         int err = 0;
1391         event_op f = process_synthesized_event;
1392
1393         if (rec->opts.tail_synthesize != tail)
1394                 return 0;
1395
1396         if (data->is_pipe) {
1397                 err = perf_event__synthesize_for_pipe(tool, session, data,
1398                                                       process_synthesized_event);
1399                 if (err < 0)
1400                         goto out;
1401
1402                 rec->bytes_written += err;
1403         }
1404
1405         err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
1406                                           process_synthesized_event, machine);
1407         if (err)
1408                 goto out;
1409
1410         /* Synthesize id_index before auxtrace_info */
1411         if (rec->opts.auxtrace_sample_mode) {
1412                 err = perf_event__synthesize_id_index(tool,
1413                                                       process_synthesized_event,
1414                                                       session->evlist, machine);
1415                 if (err)
1416                         goto out;
1417         }
1418
1419         if (rec->opts.full_auxtrace) {
1420                 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
1421                                         session, process_synthesized_event);
1422                 if (err)
1423                         goto out;
1424         }
1425
1426         if (!evlist__exclude_kernel(rec->evlist)) {
1427                 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1428                                                          machine);
1429                 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
1430                                    "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1431                                    "Check /proc/kallsyms permission or run as root.\n");
1432
1433                 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1434                                                      machine);
1435                 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
1436                                    "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1437                                    "Check /proc/modules permission or run as root.\n");
1438         }
1439
1440         if (perf_guest) {
1441                 machines__process_guests(&session->machines,
1442                                          perf_event__synthesize_guest_os, tool);
1443         }
1444
1445         err = perf_event__synthesize_extra_attr(&rec->tool,
1446                                                 rec->evlist,
1447                                                 process_synthesized_event,
1448                                                 data->is_pipe);
1449         if (err)
1450                 goto out;
1451
1452         err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads,
1453                                                  process_synthesized_event,
1454                                                 NULL);
1455         if (err < 0) {
1456                 pr_err("Couldn't synthesize thread map.\n");
1457                 return err;
1458         }
1459
1460         err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.cpus,
1461                                              process_synthesized_event, NULL);
1462         if (err < 0) {
1463                 pr_err("Couldn't synthesize cpu map.\n");
1464                 return err;
1465         }
1466
1467         err = perf_event__synthesize_bpf_events(session, process_synthesized_event,
1468                                                 machine, opts);
1469         if (err < 0)
1470                 pr_warning("Couldn't synthesize bpf events.\n");
1471
1472         err = perf_event__synthesize_cgroups(tool, process_synthesized_event,
1473                                              machine);
1474         if (err < 0)
1475                 pr_warning("Couldn't synthesize cgroup events.\n");
1476
1477         if (rec->opts.nr_threads_synthesize > 1) {
1478                 perf_set_multithreaded();
1479                 f = process_locked_synthesized_event;
1480         }
1481
1482         err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->core.threads,
1483                                             f, opts->sample_address,
1484                                             rec->opts.nr_threads_synthesize);
1485
1486         if (rec->opts.nr_threads_synthesize > 1)
1487                 perf_set_singlethreaded();
1488
1489 out:
1490         return err;
1491 }
1492
1493 static int record__process_signal_event(union perf_event *event __maybe_unused, void *data)
1494 {
1495         struct record *rec = data;
1496         pthread_kill(rec->thread_id, SIGUSR2);
1497         return 0;
1498 }
1499
1500 static int record__setup_sb_evlist(struct record *rec)
1501 {
1502         struct record_opts *opts = &rec->opts;
1503
1504         if (rec->sb_evlist != NULL) {
1505                 /*
1506                  * We get here if --switch-output-event populated the
1507                  * sb_evlist, so associate a callback that will send a SIGUSR2
1508                  * to the main thread.
1509                  */
1510                 evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec);
1511                 rec->thread_id = pthread_self();
1512         }
1513 #ifdef HAVE_LIBBPF_SUPPORT
1514         if (!opts->no_bpf_event) {
1515                 if (rec->sb_evlist == NULL) {
1516                         rec->sb_evlist = evlist__new();
1517
1518                         if (rec->sb_evlist == NULL) {
1519                                 pr_err("Couldn't create side band evlist.\n.");
1520                                 return -1;
1521                         }
1522                 }
1523
1524                 if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) {
1525                         pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
1526                         return -1;
1527                 }
1528         }
1529 #endif
1530         if (evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) {
1531                 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1532                 opts->no_bpf_event = true;
1533         }
1534
1535         return 0;
1536 }
1537
1538 static int record__init_clock(struct record *rec)
1539 {
1540         struct perf_session *session = rec->session;
1541         struct timespec ref_clockid;
1542         struct timeval ref_tod;
1543         u64 ref;
1544
1545         if (!rec->opts.use_clockid)
1546                 return 0;
1547
1548         if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
1549                 session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns;
1550
1551         session->header.env.clock.clockid = rec->opts.clockid;
1552
1553         if (gettimeofday(&ref_tod, NULL) != 0) {
1554                 pr_err("gettimeofday failed, cannot set reference time.\n");
1555                 return -1;
1556         }
1557
1558         if (clock_gettime(rec->opts.clockid, &ref_clockid)) {
1559                 pr_err("clock_gettime failed, cannot set reference time.\n");
1560                 return -1;
1561         }
1562
1563         ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC +
1564               (u64) ref_tod.tv_usec * NSEC_PER_USEC;
1565
1566         session->header.env.clock.tod_ns = ref;
1567
1568         ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC +
1569               (u64) ref_clockid.tv_nsec;
1570
1571         session->header.env.clock.clockid_ns = ref;
1572         return 0;
1573 }
1574
1575 static void hit_auxtrace_snapshot_trigger(struct record *rec)
1576 {
1577         if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
1578                 trigger_hit(&auxtrace_snapshot_trigger);
1579                 auxtrace_record__snapshot_started = 1;
1580                 if (auxtrace_record__snapshot_start(rec->itr))
1581                         trigger_error(&auxtrace_snapshot_trigger);
1582         }
1583 }
1584
1585 static void record__uniquify_name(struct record *rec)
1586 {
1587         struct evsel *pos;
1588         struct evlist *evlist = rec->evlist;
1589         char *new_name;
1590         int ret;
1591
1592         if (!perf_pmu__has_hybrid())
1593                 return;
1594
1595         evlist__for_each_entry(evlist, pos) {
1596                 if (!evsel__is_hybrid(pos))
1597                         continue;
1598
1599                 if (strchr(pos->name, '/'))
1600                         continue;
1601
1602                 ret = asprintf(&new_name, "%s/%s/",
1603                                pos->pmu_name, pos->name);
1604                 if (ret) {
1605                         free(pos->name);
1606                         pos->name = new_name;
1607                 }
1608         }
1609 }
1610
1611 static int __cmd_record(struct record *rec, int argc, const char **argv)
1612 {
1613         int err;
1614         int status = 0;
1615         unsigned long waking = 0;
1616         const bool forks = argc > 0;
1617         struct perf_tool *tool = &rec->tool;
1618         struct record_opts *opts = &rec->opts;
1619         struct perf_data *data = &rec->data;
1620         struct perf_session *session;
1621         bool disabled = false, draining = false;
1622         int fd;
1623         float ratio = 0;
1624         enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
1625
1626         atexit(record__sig_exit);
1627         signal(SIGCHLD, sig_handler);
1628         signal(SIGINT, sig_handler);
1629         signal(SIGTERM, sig_handler);
1630         signal(SIGSEGV, sigsegv_handler);
1631
1632         if (rec->opts.record_namespaces)
1633                 tool->namespace_events = true;
1634
1635         if (rec->opts.record_cgroup) {
1636 #ifdef HAVE_FILE_HANDLE
1637                 tool->cgroup_events = true;
1638 #else
1639                 pr_err("cgroup tracking is not supported\n");
1640                 return -1;
1641 #endif
1642         }
1643
1644         if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
1645                 signal(SIGUSR2, snapshot_sig_handler);
1646                 if (rec->opts.auxtrace_snapshot_mode)
1647                         trigger_on(&auxtrace_snapshot_trigger);
1648                 if (rec->switch_output.enabled)
1649                         trigger_on(&switch_output_trigger);
1650         } else {
1651                 signal(SIGUSR2, SIG_IGN);
1652         }
1653
1654         session = perf_session__new(data, tool);
1655         if (IS_ERR(session)) {
1656                 pr_err("Perf session creation failed.\n");
1657                 return PTR_ERR(session);
1658         }
1659
1660         fd = perf_data__fd(data);
1661         rec->session = session;
1662
1663         if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
1664                 pr_err("Compression initialization failed.\n");
1665                 return -1;
1666         }
1667 #ifdef HAVE_EVENTFD_SUPPORT
1668         done_fd = eventfd(0, EFD_NONBLOCK);
1669         if (done_fd < 0) {
1670                 pr_err("Failed to create wakeup eventfd, error: %m\n");
1671                 status = -1;
1672                 goto out_delete_session;
1673         }
1674         err = evlist__add_wakeup_eventfd(rec->evlist, done_fd);
1675         if (err < 0) {
1676                 pr_err("Failed to add wakeup eventfd to poll list\n");
1677                 status = err;
1678                 goto out_delete_session;
1679         }
1680 #endif // HAVE_EVENTFD_SUPPORT
1681
1682         session->header.env.comp_type  = PERF_COMP_ZSTD;
1683         session->header.env.comp_level = rec->opts.comp_level;
1684
1685         if (rec->opts.kcore &&
1686             !record__kcore_readable(&session->machines.host)) {
1687                 pr_err("ERROR: kcore is not readable.\n");
1688                 return -1;
1689         }
1690
1691         if (record__init_clock(rec))
1692                 return -1;
1693
1694         record__init_features(rec);
1695
1696         if (forks) {
1697                 err = evlist__prepare_workload(rec->evlist, &opts->target, argv, data->is_pipe,
1698                                                workload_exec_failed_signal);
1699                 if (err < 0) {
1700                         pr_err("Couldn't run the workload!\n");
1701                         status = err;
1702                         goto out_delete_session;
1703                 }
1704         }
1705
1706         /*
1707          * If we have just single event and are sending data
1708          * through pipe, we need to force the ids allocation,
1709          * because we synthesize event name through the pipe
1710          * and need the id for that.
1711          */
1712         if (data->is_pipe && rec->evlist->core.nr_entries == 1)
1713                 rec->opts.sample_id = true;
1714
1715         record__uniquify_name(rec);
1716
1717         if (record__open(rec) != 0) {
1718                 err = -1;
1719                 goto out_child;
1720         }
1721         session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
1722
1723         if (rec->opts.kcore) {
1724                 err = record__kcore_copy(&session->machines.host, data);
1725                 if (err) {
1726                         pr_err("ERROR: Failed to copy kcore\n");
1727                         goto out_child;
1728                 }
1729         }
1730
1731         err = bpf__apply_obj_config();
1732         if (err) {
1733                 char errbuf[BUFSIZ];
1734
1735                 bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
1736                 pr_err("ERROR: Apply config to BPF failed: %s\n",
1737                          errbuf);
1738                 goto out_child;
1739         }
1740
1741         /*
1742          * Normally perf_session__new would do this, but it doesn't have the
1743          * evlist.
1744          */
1745         if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) {
1746                 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
1747                 rec->tool.ordered_events = false;
1748         }
1749
1750         if (!rec->evlist->core.nr_groups)
1751                 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
1752
1753         if (data->is_pipe) {
1754                 err = perf_header__write_pipe(fd);
1755                 if (err < 0)
1756                         goto out_child;
1757         } else {
1758                 err = perf_session__write_header(session, rec->evlist, fd, false);
1759                 if (err < 0)
1760                         goto out_child;
1761         }
1762
1763         err = -1;
1764         if (!rec->no_buildid
1765             && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
1766                 pr_err("Couldn't generate buildids. "
1767                        "Use --no-buildid to profile anyway.\n");
1768                 goto out_child;
1769         }
1770
1771         err = record__setup_sb_evlist(rec);
1772         if (err)
1773                 goto out_child;
1774
1775         err = record__synthesize(rec, false);
1776         if (err < 0)
1777                 goto out_child;
1778
1779         if (rec->realtime_prio) {
1780                 struct sched_param param;
1781
1782                 param.sched_priority = rec->realtime_prio;
1783                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1784                         pr_err("Could not set realtime priority.\n");
1785                         err = -1;
1786                         goto out_child;
1787                 }
1788         }
1789
1790         /*
1791          * When perf is starting the traced process, all the events
1792          * (apart from group members) have enable_on_exec=1 set,
1793          * so don't spoil it by prematurely enabling them.
1794          */
1795         if (!target__none(&opts->target) && !opts->initial_delay)
1796                 evlist__enable(rec->evlist);
1797
1798         /*
1799          * Let the child rip
1800          */
1801         if (forks) {
1802                 struct machine *machine = &session->machines.host;
1803                 union perf_event *event;
1804                 pid_t tgid;
1805
1806                 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
1807                 if (event == NULL) {
1808                         err = -ENOMEM;
1809                         goto out_child;
1810                 }
1811
1812                 /*
1813                  * Some H/W events are generated before COMM event
1814                  * which is emitted during exec(), so perf script
1815                  * cannot see a correct process name for those events.
1816                  * Synthesize COMM event to prevent it.
1817                  */
1818                 tgid = perf_event__synthesize_comm(tool, event,
1819                                                    rec->evlist->workload.pid,
1820                                                    process_synthesized_event,
1821                                                    machine);
1822                 free(event);
1823
1824                 if (tgid == -1)
1825                         goto out_child;
1826
1827                 event = malloc(sizeof(event->namespaces) +
1828                                (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
1829                                machine->id_hdr_size);
1830                 if (event == NULL) {
1831                         err = -ENOMEM;
1832                         goto out_child;
1833                 }
1834
1835                 /*
1836                  * Synthesize NAMESPACES event for the command specified.
1837                  */
1838                 perf_event__synthesize_namespaces(tool, event,
1839                                                   rec->evlist->workload.pid,
1840                                                   tgid, process_synthesized_event,
1841                                                   machine);
1842                 free(event);
1843
1844                 evlist__start_workload(rec->evlist);
1845         }
1846
1847         if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack))
1848                 goto out_child;
1849
1850         if (opts->initial_delay) {
1851                 pr_info(EVLIST_DISABLED_MSG);
1852                 if (opts->initial_delay > 0) {
1853                         usleep(opts->initial_delay * USEC_PER_MSEC);
1854                         evlist__enable(rec->evlist);
1855                         pr_info(EVLIST_ENABLED_MSG);
1856                 }
1857         }
1858
1859         trigger_ready(&auxtrace_snapshot_trigger);
1860         trigger_ready(&switch_output_trigger);
1861         perf_hooks__invoke_record_start();
1862         for (;;) {
1863                 unsigned long long hits = rec->samples;
1864
1865                 /*
1866                  * rec->evlist->bkw_mmap_state is possible to be
1867                  * BKW_MMAP_EMPTY here: when done == true and
1868                  * hits != rec->samples in previous round.
1869                  *
1870                  * evlist__toggle_bkw_mmap ensure we never
1871                  * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
1872                  */
1873                 if (trigger_is_hit(&switch_output_trigger) || done || draining)
1874                         evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
1875
1876                 if (record__mmap_read_all(rec, false) < 0) {
1877                         trigger_error(&auxtrace_snapshot_trigger);
1878                         trigger_error(&switch_output_trigger);
1879                         err = -1;
1880                         goto out_child;
1881                 }
1882
1883                 if (auxtrace_record__snapshot_started) {
1884                         auxtrace_record__snapshot_started = 0;
1885                         if (!trigger_is_error(&auxtrace_snapshot_trigger))
1886                                 record__read_auxtrace_snapshot(rec, false);
1887                         if (trigger_is_error(&auxtrace_snapshot_trigger)) {
1888                                 pr_err("AUX area tracing snapshot failed\n");
1889                                 err = -1;
1890                                 goto out_child;
1891                         }
1892                 }
1893
1894                 if (trigger_is_hit(&switch_output_trigger)) {
1895                         /*
1896                          * If switch_output_trigger is hit, the data in
1897                          * overwritable ring buffer should have been collected,
1898                          * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
1899                          *
1900                          * If SIGUSR2 raise after or during record__mmap_read_all(),
1901                          * record__mmap_read_all() didn't collect data from
1902                          * overwritable ring buffer. Read again.
1903                          */
1904                         if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
1905                                 continue;
1906                         trigger_ready(&switch_output_trigger);
1907
1908                         /*
1909                          * Reenable events in overwrite ring buffer after
1910                          * record__mmap_read_all(): we should have collected
1911                          * data from it.
1912                          */
1913                         evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
1914
1915                         if (!quiet)
1916                                 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
1917                                         waking);
1918                         waking = 0;
1919                         fd = record__switch_output(rec, false);
1920                         if (fd < 0) {
1921                                 pr_err("Failed to switch to new file\n");
1922                                 trigger_error(&switch_output_trigger);
1923                                 err = fd;
1924                                 goto out_child;
1925                         }
1926
1927                         /* re-arm the alarm */
1928                         if (rec->switch_output.time)
1929                                 alarm(rec->switch_output.time);
1930                 }
1931
1932                 if (hits == rec->samples) {
1933                         if (done || draining)
1934                                 break;
1935                         err = evlist__poll(rec->evlist, -1);
1936                         /*
1937                          * Propagate error, only if there's any. Ignore positive
1938                          * number of returned events and interrupt error.
1939                          */
1940                         if (err > 0 || (err < 0 && errno == EINTR))
1941                                 err = 0;
1942                         waking++;
1943
1944                         if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
1945                                 draining = true;
1946                 }
1947
1948                 if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
1949                         switch (cmd) {
1950                         case EVLIST_CTL_CMD_SNAPSHOT:
1951                                 hit_auxtrace_snapshot_trigger(rec);
1952                                 evlist__ctlfd_ack(rec->evlist);
1953                                 break;
1954                         case EVLIST_CTL_CMD_STOP:
1955                                 done = 1;
1956                                 break;
1957                         case EVLIST_CTL_CMD_ACK:
1958                         case EVLIST_CTL_CMD_UNSUPPORTED:
1959                         case EVLIST_CTL_CMD_ENABLE:
1960                         case EVLIST_CTL_CMD_DISABLE:
1961                         case EVLIST_CTL_CMD_EVLIST:
1962                         case EVLIST_CTL_CMD_PING:
1963                         default:
1964                                 break;
1965                         }
1966                 }
1967
1968                 /*
1969                  * When perf is starting the traced process, at the end events
1970                  * die with the process and we wait for that. Thus no need to
1971                  * disable events in this case.
1972                  */
1973                 if (done && !disabled && !target__none(&opts->target)) {
1974                         trigger_off(&auxtrace_snapshot_trigger);
1975                         evlist__disable(rec->evlist);
1976                         disabled = true;
1977                 }
1978         }
1979
1980         trigger_off(&auxtrace_snapshot_trigger);
1981         trigger_off(&switch_output_trigger);
1982
1983         if (opts->auxtrace_snapshot_on_exit)
1984                 record__auxtrace_snapshot_exit(rec);
1985
1986         if (forks && workload_exec_errno) {
1987                 char msg[STRERR_BUFSIZE], strevsels[2048];
1988                 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
1989
1990                 evlist__scnprintf_evsels(rec->evlist, sizeof(strevsels), strevsels);
1991
1992                 pr_err("Failed to collect '%s' for the '%s' workload: %s\n",
1993                         strevsels, argv[0], emsg);
1994                 err = -1;
1995                 goto out_child;
1996         }
1997
1998         if (!quiet)
1999                 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
2000
2001         if (target__none(&rec->opts.target))
2002                 record__synthesize_workload(rec, true);
2003
2004 out_child:
2005         evlist__finalize_ctlfd(rec->evlist);
2006         record__mmap_read_all(rec, true);
2007         record__aio_mmap_read_sync(rec);
2008
2009         if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
2010                 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
2011                 session->header.env.comp_ratio = ratio + 0.5;
2012         }
2013
2014         if (forks) {
2015                 int exit_status;
2016
2017                 if (!child_finished)
2018                         kill(rec->evlist->workload.pid, SIGTERM);
2019
2020                 wait(&exit_status);
2021
2022                 if (err < 0)
2023                         status = err;
2024                 else if (WIFEXITED(exit_status))
2025                         status = WEXITSTATUS(exit_status);
2026                 else if (WIFSIGNALED(exit_status))
2027                         signr = WTERMSIG(exit_status);
2028         } else
2029                 status = err;
2030
2031         record__synthesize(rec, true);
2032         /* this will be recalculated during process_buildids() */
2033         rec->samples = 0;
2034
2035         if (!err) {
2036                 if (!rec->timestamp_filename) {
2037                         record__finish_output(rec);
2038                 } else {
2039                         fd = record__switch_output(rec, true);
2040                         if (fd < 0) {
2041                                 status = fd;
2042                                 goto out_delete_session;
2043                         }
2044                 }
2045         }
2046
2047         perf_hooks__invoke_record_end();
2048
2049         if (!err && !quiet) {
2050                 char samples[128];
2051                 const char *postfix = rec->timestamp_filename ?
2052                                         ".<timestamp>" : "";
2053
2054                 if (rec->samples && !rec->opts.full_auxtrace)
2055                         scnprintf(samples, sizeof(samples),
2056                                   " (%" PRIu64 " samples)", rec->samples);
2057                 else
2058                         samples[0] = '\0';
2059
2060                 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s",
2061                         perf_data__size(data) / 1024.0 / 1024.0,
2062                         data->path, postfix, samples);
2063                 if (ratio) {
2064                         fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)",
2065                                         rec->session->bytes_transferred / 1024.0 / 1024.0,
2066                                         ratio);
2067                 }
2068                 fprintf(stderr, " ]\n");
2069         }
2070
2071 out_delete_session:
2072 #ifdef HAVE_EVENTFD_SUPPORT
2073         if (done_fd >= 0)
2074                 close(done_fd);
2075 #endif
2076         zstd_fini(&session->zstd_data);
2077         perf_session__delete(session);
2078
2079         if (!opts->no_bpf_event)
2080                 evlist__stop_sb_thread(rec->sb_evlist);
2081         return status;
2082 }
2083
2084 static void callchain_debug(struct callchain_param *callchain)
2085 {
2086         static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
2087
2088         pr_debug("callchain: type %s\n", str[callchain->record_mode]);
2089
2090         if (callchain->record_mode == CALLCHAIN_DWARF)
2091                 pr_debug("callchain: stack dump size %d\n",
2092                          callchain->dump_size);
2093 }
2094
2095 int record_opts__parse_callchain(struct record_opts *record,
2096                                  struct callchain_param *callchain,
2097                                  const char *arg, bool unset)
2098 {
2099         int ret;
2100         callchain->enabled = !unset;
2101
2102         /* --no-call-graph */
2103         if (unset) {
2104                 callchain->record_mode = CALLCHAIN_NONE;
2105                 pr_debug("callchain: disabled\n");
2106                 return 0;
2107         }
2108
2109         ret = parse_callchain_record_opt(arg, callchain);
2110         if (!ret) {
2111                 /* Enable data address sampling for DWARF unwind. */
2112                 if (callchain->record_mode == CALLCHAIN_DWARF)
2113                         record->sample_address = true;
2114                 callchain_debug(callchain);
2115         }
2116
2117         return ret;
2118 }
2119
2120 int record_parse_callchain_opt(const struct option *opt,
2121                                const char *arg,
2122                                int unset)
2123 {
2124         return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
2125 }
2126
2127 int record_callchain_opt(const struct option *opt,
2128                          const char *arg __maybe_unused,
2129                          int unset __maybe_unused)
2130 {
2131         struct callchain_param *callchain = opt->value;
2132
2133         callchain->enabled = true;
2134
2135         if (callchain->record_mode == CALLCHAIN_NONE)
2136                 callchain->record_mode = CALLCHAIN_FP;
2137
2138         callchain_debug(callchain);
2139         return 0;
2140 }
2141
2142 static int perf_record_config(const char *var, const char *value, void *cb)
2143 {
2144         struct record *rec = cb;
2145
2146         if (!strcmp(var, "record.build-id")) {
2147                 if (!strcmp(value, "cache"))
2148                         rec->no_buildid_cache = false;
2149                 else if (!strcmp(value, "no-cache"))
2150                         rec->no_buildid_cache = true;
2151                 else if (!strcmp(value, "skip"))
2152                         rec->no_buildid = true;
2153                 else if (!strcmp(value, "mmap"))
2154                         rec->buildid_mmap = true;
2155                 else
2156                         return -1;
2157                 return 0;
2158         }
2159         if (!strcmp(var, "record.call-graph")) {
2160                 var = "call-graph.record-mode";
2161                 return perf_default_config(var, value, cb);
2162         }
2163 #ifdef HAVE_AIO_SUPPORT
2164         if (!strcmp(var, "record.aio")) {
2165                 rec->opts.nr_cblocks = strtol(value, NULL, 0);
2166                 if (!rec->opts.nr_cblocks)
2167                         rec->opts.nr_cblocks = nr_cblocks_default;
2168         }
2169 #endif
2170
2171         return 0;
2172 }
2173
2174
2175 static int record__parse_affinity(const struct option *opt, const char *str, int unset)
2176 {
2177         struct record_opts *opts = (struct record_opts *)opt->value;
2178
2179         if (unset || !str)
2180                 return 0;
2181
2182         if (!strcasecmp(str, "node"))
2183                 opts->affinity = PERF_AFFINITY_NODE;
2184         else if (!strcasecmp(str, "cpu"))
2185                 opts->affinity = PERF_AFFINITY_CPU;
2186
2187         return 0;
2188 }
2189
2190 static int parse_output_max_size(const struct option *opt,
2191                                  const char *str, int unset)
2192 {
2193         unsigned long *s = (unsigned long *)opt->value;
2194         static struct parse_tag tags_size[] = {
2195                 { .tag  = 'B', .mult = 1       },
2196                 { .tag  = 'K', .mult = 1 << 10 },
2197                 { .tag  = 'M', .mult = 1 << 20 },
2198                 { .tag  = 'G', .mult = 1 << 30 },
2199                 { .tag  = 0 },
2200         };
2201         unsigned long val;
2202
2203         if (unset) {
2204                 *s = 0;
2205                 return 0;
2206         }
2207
2208         val = parse_tag_value(str, tags_size);
2209         if (val != (unsigned long) -1) {
2210                 *s = val;
2211                 return 0;
2212         }
2213
2214         return -1;
2215 }
2216
2217 static int record__parse_mmap_pages(const struct option *opt,
2218                                     const char *str,
2219                                     int unset __maybe_unused)
2220 {
2221         struct record_opts *opts = opt->value;
2222         char *s, *p;
2223         unsigned int mmap_pages;
2224         int ret;
2225
2226         if (!str)
2227                 return -EINVAL;
2228
2229         s = strdup(str);
2230         if (!s)
2231                 return -ENOMEM;
2232
2233         p = strchr(s, ',');
2234         if (p)
2235                 *p = '\0';
2236
2237         if (*s) {
2238                 ret = __evlist__parse_mmap_pages(&mmap_pages, s);
2239                 if (ret)
2240                         goto out_free;
2241                 opts->mmap_pages = mmap_pages;
2242         }
2243
2244         if (!p) {
2245                 ret = 0;
2246                 goto out_free;
2247         }
2248
2249         ret = __evlist__parse_mmap_pages(&mmap_pages, p + 1);
2250         if (ret)
2251                 goto out_free;
2252
2253         opts->auxtrace_mmap_pages = mmap_pages;
2254
2255 out_free:
2256         free(s);
2257         return ret;
2258 }
2259
2260 static int parse_control_option(const struct option *opt,
2261                                 const char *str,
2262                                 int unset __maybe_unused)
2263 {
2264         struct record_opts *opts = opt->value;
2265
2266         return evlist__parse_control(str, &opts->ctl_fd, &opts->ctl_fd_ack, &opts->ctl_fd_close);
2267 }
2268
2269 static void switch_output_size_warn(struct record *rec)
2270 {
2271         u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
2272         struct switch_output *s = &rec->switch_output;
2273
2274         wakeup_size /= 2;
2275
2276         if (s->size < wakeup_size) {
2277                 char buf[100];
2278
2279                 unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
2280                 pr_warning("WARNING: switch-output data size lower than "
2281                            "wakeup kernel buffer size (%s) "
2282                            "expect bigger perf.data sizes\n", buf);
2283         }
2284 }
2285
2286 static int switch_output_setup(struct record *rec)
2287 {
2288         struct switch_output *s = &rec->switch_output;
2289         static struct parse_tag tags_size[] = {
2290                 { .tag  = 'B', .mult = 1       },
2291                 { .tag  = 'K', .mult = 1 << 10 },
2292                 { .tag  = 'M', .mult = 1 << 20 },
2293                 { .tag  = 'G', .mult = 1 << 30 },
2294                 { .tag  = 0 },
2295         };
2296         static struct parse_tag tags_time[] = {
2297                 { .tag  = 's', .mult = 1        },
2298                 { .tag  = 'm', .mult = 60       },
2299                 { .tag  = 'h', .mult = 60*60    },
2300                 { .tag  = 'd', .mult = 60*60*24 },
2301                 { .tag  = 0 },
2302         };
2303         unsigned long val;
2304
2305         /*
2306          * If we're using --switch-output-events, then we imply its
2307          * --switch-output=signal, as we'll send a SIGUSR2 from the side band
2308          *  thread to its parent.
2309          */
2310         if (rec->switch_output_event_set)
2311                 goto do_signal;
2312
2313         if (!s->set)
2314                 return 0;
2315
2316         if (!strcmp(s->str, "signal")) {
2317 do_signal:
2318                 s->signal = true;
2319                 pr_debug("switch-output with SIGUSR2 signal\n");
2320                 goto enabled;
2321         }
2322
2323         val = parse_tag_value(s->str, tags_size);
2324         if (val != (unsigned long) -1) {
2325                 s->size = val;
2326                 pr_debug("switch-output with %s size threshold\n", s->str);
2327                 goto enabled;
2328         }
2329
2330         val = parse_tag_value(s->str, tags_time);
2331         if (val != (unsigned long) -1) {
2332                 s->time = val;
2333                 pr_debug("switch-output with %s time threshold (%lu seconds)\n",
2334                          s->str, s->time);
2335                 goto enabled;
2336         }
2337
2338         return -1;
2339
2340 enabled:
2341         rec->timestamp_filename = true;
2342         s->enabled              = true;
2343
2344         if (s->size && !rec->opts.no_buffering)
2345                 switch_output_size_warn(rec);
2346
2347         return 0;
2348 }
2349
2350 static const char * const __record_usage[] = {
2351         "perf record [<options>] [<command>]",
2352         "perf record [<options>] -- <command> [<options>]",
2353         NULL
2354 };
2355 const char * const *record_usage = __record_usage;
2356
2357 static int build_id__process_mmap(struct perf_tool *tool, union perf_event *event,
2358                                   struct perf_sample *sample, struct machine *machine)
2359 {
2360         /*
2361          * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
2362          * no need to add them twice.
2363          */
2364         if (!(event->header.misc & PERF_RECORD_MISC_USER))
2365                 return 0;
2366         return perf_event__process_mmap(tool, event, sample, machine);
2367 }
2368
2369 static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event,
2370                                    struct perf_sample *sample, struct machine *machine)
2371 {
2372         /*
2373          * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
2374          * no need to add them twice.
2375          */
2376         if (!(event->header.misc & PERF_RECORD_MISC_USER))
2377                 return 0;
2378
2379         return perf_event__process_mmap2(tool, event, sample, machine);
2380 }
2381
2382 static int process_timestamp_boundary(struct perf_tool *tool,
2383                                       union perf_event *event __maybe_unused,
2384                                       struct perf_sample *sample,
2385                                       struct machine *machine __maybe_unused)
2386 {
2387         struct record *rec = container_of(tool, struct record, tool);
2388
2389         set_timestamp_boundary(rec, sample->time);
2390         return 0;
2391 }
2392
2393 /*
2394  * XXX Ideally would be local to cmd_record() and passed to a record__new
2395  * because we need to have access to it in record__exit, that is called
2396  * after cmd_record() exits, but since record_options need to be accessible to
2397  * builtin-script, leave it here.
2398  *
2399  * At least we don't ouch it in all the other functions here directly.
2400  *
2401  * Just say no to tons of global variables, sigh.
2402  */
2403 static struct record record = {
2404         .opts = {
2405                 .sample_time         = true,
2406                 .mmap_pages          = UINT_MAX,
2407                 .user_freq           = UINT_MAX,
2408                 .user_interval       = ULLONG_MAX,
2409                 .freq                = 4000,
2410                 .target              = {
2411                         .uses_mmap   = true,
2412                         .default_per_cpu = true,
2413                 },
2414                 .mmap_flush          = MMAP_FLUSH_DEFAULT,
2415                 .nr_threads_synthesize = 1,
2416                 .ctl_fd              = -1,
2417                 .ctl_fd_ack          = -1,
2418         },
2419         .tool = {
2420                 .sample         = process_sample_event,
2421                 .fork           = perf_event__process_fork,
2422                 .exit           = perf_event__process_exit,
2423                 .comm           = perf_event__process_comm,
2424                 .namespaces     = perf_event__process_namespaces,
2425                 .mmap           = build_id__process_mmap,
2426                 .mmap2          = build_id__process_mmap2,
2427                 .itrace_start   = process_timestamp_boundary,
2428                 .aux            = process_timestamp_boundary,
2429                 .ordered_events = true,
2430         },
2431 };
2432
2433 const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
2434         "\n\t\t\t\tDefault: fp";
2435
2436 static bool dry_run;
2437
2438 /*
2439  * XXX Will stay a global variable till we fix builtin-script.c to stop messing
2440  * with it and switch to use the library functions in perf_evlist that came
2441  * from builtin-record.c, i.e. use record_opts,
2442  * evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
2443  * using pipes, etc.
2444  */
2445 static struct option __record_options[] = {
2446         OPT_CALLBACK('e', "event", &record.evlist, "event",
2447                      "event selector. use 'perf list' to list available events",
2448                      parse_events_option),
2449         OPT_CALLBACK(0, "filter", &record.evlist, "filter",
2450                      "event filter", parse_filter),
2451         OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
2452                            NULL, "don't record events from perf itself",
2453                            exclude_perf),
2454         OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
2455                     "record events on existing process id"),
2456         OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
2457                     "record events on existing thread id"),
2458         OPT_INTEGER('r', "realtime", &record.realtime_prio,
2459                     "collect data with this RT SCHED_FIFO priority"),
2460         OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
2461                     "collect data without buffering"),
2462         OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
2463                     "collect raw sample records from all opened counters"),
2464         OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
2465                             "system-wide collection from all CPUs"),
2466         OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
2467                     "list of cpus to monitor"),
2468         OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
2469         OPT_STRING('o', "output", &record.data.path, "file",
2470                     "output file name"),
2471         OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
2472                         &record.opts.no_inherit_set,
2473                         "child tasks do not inherit counters"),
2474         OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
2475                     "synthesize non-sample events at the end of output"),
2476         OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
2477         OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"),
2478         OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
2479                     "Fail if the specified frequency can't be used"),
2480         OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
2481                      "profile at this frequency",
2482                       record__parse_freq),
2483         OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
2484                      "number of mmap data pages and AUX area tracing mmap pages",
2485                      record__parse_mmap_pages),
2486         OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
2487                      "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
2488                      record__mmap_flush_parse),
2489         OPT_BOOLEAN(0, "group", &record.opts.group,
2490                     "put the counters into a counter group"),
2491         OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
2492                            NULL, "enables call-graph recording" ,
2493                            &record_callchain_opt),
2494         OPT_CALLBACK(0, "call-graph", &record.opts,
2495                      "record_mode[,record_size]", record_callchain_help,
2496                      &record_parse_callchain_opt),
2497         OPT_INCR('v', "verbose", &verbose,
2498                     "be more verbose (show counter open errors, etc)"),
2499         OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
2500         OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
2501                     "per thread counts"),
2502         OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
2503         OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
2504                     "Record the sample physical addresses"),
2505         OPT_BOOLEAN(0, "data-page-size", &record.opts.sample_data_page_size,
2506                     "Record the sampled data address data page size"),
2507         OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size,
2508                     "Record the sampled code address (ip) page size"),
2509         OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
2510         OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
2511                         &record.opts.sample_time_set,
2512                         "Record the sample timestamps"),
2513         OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
2514                         "Record the sample period"),
2515         OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
2516                     "don't sample"),
2517         OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
2518                         &record.no_buildid_cache_set,
2519                         "do not update the buildid cache"),
2520         OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
2521                         &record.no_buildid_set,
2522                         "do not collect buildids in perf.data"),
2523         OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
2524                      "monitor event in cgroup name only",
2525                      parse_cgroups),
2526         OPT_INTEGER('D', "delay", &record.opts.initial_delay,
2527                   "ms to wait before starting measurement after program start (-1: start with events disabled)"),
2528         OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"),
2529         OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
2530                    "user to profile"),
2531
2532         OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
2533                      "branch any", "sample any taken branches",
2534                      parse_branch_stack),
2535
2536         OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
2537                      "branch filter mask", "branch stack filter modes",
2538                      parse_branch_stack),
2539         OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
2540                     "sample by weight (on special events only)"),
2541         OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
2542                     "sample transaction flags (special events only)"),
2543         OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
2544                     "use per-thread mmaps"),
2545         OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
2546                     "sample selected machine registers on interrupt,"
2547                     " use '-I?' to list register names", parse_intr_regs),
2548         OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
2549                     "sample selected machine registers on interrupt,"
2550                     " use '--user-regs=?' to list register names", parse_user_regs),
2551         OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
2552                     "Record running/enabled time of read (:S) events"),
2553         OPT_CALLBACK('k', "clockid", &record.opts,
2554         "clockid", "clockid to use for events, see clock_gettime()",
2555         parse_clockid),
2556         OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
2557                           "opts", "AUX area tracing Snapshot Mode", ""),
2558         OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts,
2559                           "opts", "sample AUX area", ""),
2560         OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
2561                         "per thread proc mmap processing timeout in ms"),
2562         OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
2563                     "Record namespaces events"),
2564         OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
2565                     "Record cgroup events"),
2566         OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events,
2567                         &record.opts.record_switch_events_set,
2568                         "Record context switch events"),
2569         OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
2570                          "Configure all used events to run in kernel space.",
2571                          PARSE_OPT_EXCLUSIVE),
2572         OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
2573                          "Configure all used events to run in user space.",
2574                          PARSE_OPT_EXCLUSIVE),
2575         OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
2576                     "collect kernel callchains"),
2577         OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
2578                     "collect user callchains"),
2579         OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
2580                    "clang binary to use for compiling BPF scriptlets"),
2581         OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
2582                    "options passed to clang when compiling BPF scriptlets"),
2583         OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
2584                    "file", "vmlinux pathname"),
2585         OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
2586                     "Record build-id of all DSOs regardless of hits"),
2587         OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap,
2588                     "Record build-id in map events"),
2589         OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
2590                     "append timestamp to output filename"),
2591         OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
2592                     "Record timestamp boundary (time of first/last samples)"),
2593         OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
2594                           &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
2595                           "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
2596                           "signal"),
2597         OPT_CALLBACK_SET(0, "switch-output-event", &record.sb_evlist, &record.switch_output_event_set, "switch output event",
2598                          "switch output event selector. use 'perf list' to list available events",
2599                          parse_events_option_new_evlist),
2600         OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
2601                    "Limit number of switch output generated files"),
2602         OPT_BOOLEAN(0, "dry-run", &dry_run,
2603                     "Parse options then exit"),
2604 #ifdef HAVE_AIO_SUPPORT
2605         OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
2606                      &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
2607                      record__aio_parse),
2608 #endif
2609         OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
2610                      "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
2611                      record__parse_affinity),
2612 #ifdef HAVE_ZSTD_SUPPORT
2613         OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default,
2614                             "n", "Compressed records using specified level (default: 1 - fastest compression, 22 - greatest compression)",
2615                             record__parse_comp_level),
2616 #endif
2617         OPT_CALLBACK(0, "max-size", &record.output_max_size,
2618                      "size", "Limit the maximum size of the output file", parse_output_max_size),
2619         OPT_UINTEGER(0, "num-thread-synthesize",
2620                      &record.opts.nr_threads_synthesize,
2621                      "number of threads to run for event synthesis"),
2622 #ifdef HAVE_LIBPFM
2623         OPT_CALLBACK(0, "pfm-events", &record.evlist, "event",
2624                 "libpfm4 event selector. use 'perf list' to list available events",
2625                 parse_libpfm_events_option),
2626 #endif
2627         OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]",
2628                      "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events,\n"
2629                      "\t\t\t  'snapshot': AUX area tracing snapshot).\n"
2630                      "\t\t\t  Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n"
2631                      "\t\t\t  Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.",
2632                       parse_control_option),
2633         OPT_END()
2634 };
2635
2636 struct option *record_options = __record_options;
2637
2638 int cmd_record(int argc, const char **argv)
2639 {
2640         int err;
2641         struct record *rec = &record;
2642         char errbuf[BUFSIZ];
2643
2644         setlocale(LC_ALL, "");
2645
2646 #ifndef HAVE_LIBBPF_SUPPORT
2647 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c)
2648         set_nobuild('\0', "clang-path", true);
2649         set_nobuild('\0', "clang-opt", true);
2650 # undef set_nobuild
2651 #endif
2652
2653 #ifndef HAVE_BPF_PROLOGUE
2654 # if !defined (HAVE_DWARF_SUPPORT)
2655 #  define REASON  "NO_DWARF=1"
2656 # elif !defined (HAVE_LIBBPF_SUPPORT)
2657 #  define REASON  "NO_LIBBPF=1"
2658 # else
2659 #  define REASON  "this architecture doesn't support BPF prologue"
2660 # endif
2661 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
2662         set_nobuild('\0', "vmlinux", true);
2663 # undef set_nobuild
2664 # undef REASON
2665 #endif
2666
2667         rec->opts.affinity = PERF_AFFINITY_SYS;
2668
2669         rec->evlist = evlist__new();
2670         if (rec->evlist == NULL)
2671                 return -ENOMEM;
2672
2673         err = perf_config(perf_record_config, rec);
2674         if (err)
2675                 return err;
2676
2677         argc = parse_options(argc, argv, record_options, record_usage,
2678                             PARSE_OPT_STOP_AT_NON_OPTION);
2679         if (quiet)
2680                 perf_quiet_option();
2681
2682         /* Make system wide (-a) the default target. */
2683         if (!argc && target__none(&rec->opts.target))
2684                 rec->opts.target.system_wide = true;
2685
2686         if (nr_cgroups && !rec->opts.target.system_wide) {
2687                 usage_with_options_msg(record_usage, record_options,
2688                         "cgroup monitoring only available in system-wide mode");
2689
2690         }
2691
2692         if (rec->buildid_mmap) {
2693                 if (!perf_can_record_build_id()) {
2694                         pr_err("Failed: no support to record build id in mmap events, update your kernel.\n");
2695                         err = -EINVAL;
2696                         goto out_opts;
2697                 }
2698                 pr_debug("Enabling build id in mmap2 events.\n");
2699                 /* Enable mmap build id synthesizing. */
2700                 symbol_conf.buildid_mmap2 = true;
2701                 /* Enable perf_event_attr::build_id bit. */
2702                 rec->opts.build_id = true;
2703                 /* Disable build id cache. */
2704                 rec->no_buildid = true;
2705         }
2706
2707         if (rec->opts.record_cgroup && !perf_can_record_cgroup()) {
2708                 pr_err("Kernel has no cgroup sampling support.\n");
2709                 err = -EINVAL;
2710                 goto out_opts;
2711         }
2712
2713         if (rec->opts.kcore)
2714                 rec->data.is_dir = true;
2715
2716         if (rec->opts.comp_level != 0) {
2717                 pr_debug("Compression enabled, disabling build id collection at the end of the session.\n");
2718                 rec->no_buildid = true;
2719         }
2720
2721         if (rec->opts.record_switch_events &&
2722             !perf_can_record_switch_events()) {
2723                 ui__error("kernel does not support recording context switch events\n");
2724                 parse_options_usage(record_usage, record_options, "switch-events", 0);
2725                 err = -EINVAL;
2726                 goto out_opts;
2727         }
2728
2729         if (switch_output_setup(rec)) {
2730                 parse_options_usage(record_usage, record_options, "switch-output", 0);
2731                 err = -EINVAL;
2732                 goto out_opts;
2733         }
2734
2735         if (rec->switch_output.time) {
2736                 signal(SIGALRM, alarm_sig_handler);
2737                 alarm(rec->switch_output.time);
2738         }
2739
2740         if (rec->switch_output.num_files) {
2741                 rec->switch_output.filenames = calloc(sizeof(char *),
2742                                                       rec->switch_output.num_files);
2743                 if (!rec->switch_output.filenames) {
2744                         err = -EINVAL;
2745                         goto out_opts;
2746                 }
2747         }
2748
2749         /*
2750          * Allow aliases to facilitate the lookup of symbols for address
2751          * filters. Refer to auxtrace_parse_filters().
2752          */
2753         symbol_conf.allow_aliases = true;
2754
2755         symbol__init(NULL);
2756
2757         if (rec->opts.affinity != PERF_AFFINITY_SYS) {
2758                 rec->affinity_mask.nbits = cpu__max_cpu();
2759                 rec->affinity_mask.bits = bitmap_alloc(rec->affinity_mask.nbits);
2760                 if (!rec->affinity_mask.bits) {
2761                         pr_err("Failed to allocate thread mask for %zd cpus\n", rec->affinity_mask.nbits);
2762                         err = -ENOMEM;
2763                         goto out_opts;
2764                 }
2765                 pr_debug2("thread mask[%zd]: empty\n", rec->affinity_mask.nbits);
2766         }
2767
2768         err = record__auxtrace_init(rec);
2769         if (err)
2770                 goto out;
2771
2772         if (dry_run)
2773                 goto out;
2774
2775         err = bpf__setup_stdout(rec->evlist);
2776         if (err) {
2777                 bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf));
2778                 pr_err("ERROR: Setup BPF stdout failed: %s\n",
2779                          errbuf);
2780                 goto out;
2781         }
2782
2783         err = -ENOMEM;
2784
2785         if (rec->no_buildid_cache || rec->no_buildid) {
2786                 disable_buildid_cache();
2787         } else if (rec->switch_output.enabled) {
2788                 /*
2789                  * In 'perf record --switch-output', disable buildid
2790                  * generation by default to reduce data file switching
2791                  * overhead. Still generate buildid if they are required
2792                  * explicitly using
2793                  *
2794                  *  perf record --switch-output --no-no-buildid \
2795                  *              --no-no-buildid-cache
2796                  *
2797                  * Following code equals to:
2798                  *
2799                  * if ((rec->no_buildid || !rec->no_buildid_set) &&
2800                  *     (rec->no_buildid_cache || !rec->no_buildid_cache_set))
2801                  *         disable_buildid_cache();
2802                  */
2803                 bool disable = true;
2804
2805                 if (rec->no_buildid_set && !rec->no_buildid)
2806                         disable = false;
2807                 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
2808                         disable = false;
2809                 if (disable) {
2810                         rec->no_buildid = true;
2811                         rec->no_buildid_cache = true;
2812                         disable_buildid_cache();
2813                 }
2814         }
2815
2816         if (record.opts.overwrite)
2817                 record.opts.tail_synthesize = true;
2818
2819         if (rec->evlist->core.nr_entries == 0) {
2820                 if (perf_pmu__has_hybrid()) {
2821                         err = evlist__add_default_hybrid(rec->evlist,
2822                                                          !record.opts.no_samples);
2823                 } else {
2824                         err = __evlist__add_default(rec->evlist,
2825                                                     !record.opts.no_samples);
2826                 }
2827
2828                 if (err < 0) {
2829                         pr_err("Not enough memory for event selector list\n");
2830                         goto out;
2831                 }
2832         }
2833
2834         if (rec->opts.target.tid && !rec->opts.no_inherit_set)
2835                 rec->opts.no_inherit = true;
2836
2837         err = target__validate(&rec->opts.target);
2838         if (err) {
2839                 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2840                 ui__warning("%s\n", errbuf);
2841         }
2842
2843         err = target__parse_uid(&rec->opts.target);
2844         if (err) {
2845                 int saved_errno = errno;
2846
2847                 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2848                 ui__error("%s", errbuf);
2849
2850                 err = -saved_errno;
2851                 goto out;
2852         }
2853
2854         /* Enable ignoring missing threads when -u/-p option is defined. */
2855         rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
2856
2857         if (evlist__fix_hybrid_cpus(rec->evlist, rec->opts.target.cpu_list)) {
2858                 pr_err("failed to use cpu list %s\n",
2859                        rec->opts.target.cpu_list);
2860                 goto out;
2861         }
2862
2863         rec->opts.target.hybrid = perf_pmu__has_hybrid();
2864         err = -ENOMEM;
2865         if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
2866                 usage_with_options(record_usage, record_options);
2867
2868         err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
2869         if (err)
2870                 goto out;
2871
2872         /*
2873          * We take all buildids when the file contains
2874          * AUX area tracing data because we do not decode the
2875          * trace because it would take too long.
2876          */
2877         if (rec->opts.full_auxtrace)
2878                 rec->buildid_all = true;
2879
2880         if (rec->opts.text_poke) {
2881                 err = record__config_text_poke(rec->evlist);
2882                 if (err) {
2883                         pr_err("record__config_text_poke failed, error %d\n", err);
2884                         goto out;
2885                 }
2886         }
2887
2888         if (record_opts__config(&rec->opts)) {
2889                 err = -EINVAL;
2890                 goto out;
2891         }
2892
2893         if (rec->opts.nr_cblocks > nr_cblocks_max)
2894                 rec->opts.nr_cblocks = nr_cblocks_max;
2895         pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
2896
2897         pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
2898         pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);
2899
2900         if (rec->opts.comp_level > comp_level_max)
2901                 rec->opts.comp_level = comp_level_max;
2902         pr_debug("comp level: %d\n", rec->opts.comp_level);
2903
2904         err = __cmd_record(&record, argc, argv);
2905 out:
2906         bitmap_free(rec->affinity_mask.bits);
2907         evlist__delete(rec->evlist);
2908         symbol__exit();
2909         auxtrace_record__free(rec->itr);
2910 out_opts:
2911         evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close);
2912         return err;
2913 }
2914
2915 static void snapshot_sig_handler(int sig __maybe_unused)
2916 {
2917         struct record *rec = &record;
2918
2919         hit_auxtrace_snapshot_trigger(rec);
2920
2921         if (switch_output_signal(rec))
2922                 trigger_hit(&switch_output_trigger);
2923 }
2924
2925 static void alarm_sig_handler(int sig __maybe_unused)
2926 {
2927         struct record *rec = &record;
2928
2929         if (switch_output_time(rec))
2930                 trigger_hit(&switch_output_trigger);
2931 }