tools/perf/builtin-record.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * builtin-record.c
   4  *
   5  * Builtin record command: Record the profile of a workload
   6  * (or a CPU, or a PID) into the perf.data output file - for
   7  * later analysis via perf report.
   8  */
   9 #include "builtin.h"
  10
  11 #include "util/build-id.h"
  12 #include <subcmd/parse-options.h>
  13 #include "util/parse-events.h"
  14 #include "util/config.h"
  15
  16 #include "util/callchain.h"
  17 #include "util/cgroup.h"
  18 #include "util/header.h"
  19 #include "util/event.h"
  20 #include "util/evlist.h"
  21 #include "util/evsel.h"
  22 #include "util/debug.h"
  23 #include "util/mmap.h"
  24 #include "util/target.h"
  25 #include "util/session.h"
  26 #include "util/tool.h"
  27 #include "util/symbol.h"
  28 #include "util/record.h"
  29 #include "util/cpumap.h"
  30 #include "util/thread_map.h"
  31 #include "util/data.h"
  32 #include "util/perf_regs.h"
  33 #include "util/auxtrace.h"
  34 #include "util/tsc.h"
  35 #include "util/parse-branch-options.h"
  36 #include "util/parse-regs-options.h"
  37 #include "util/perf_api_probe.h"
  38 #include "util/llvm-utils.h"
  39 #include "util/bpf-loader.h"
  40 #include "util/trigger.h"
  41 #include "util/perf-hooks.h"
  42 #include "util/cpu-set-sched.h"
  43 #include "util/synthetic-events.h"
  44 #include "util/time-utils.h"
  45 #include "util/units.h"
  46 #include "util/bpf-event.h"
  47 #include "util/util.h"
  48 #include "util/pfm.h"
  49 #include "util/clockid.h"
  50 #include "asm/bug.h"
  51 #include "perf.h"
  52
  53 #include <errno.h>
  54 #include <inttypes.h>
  55 #include <locale.h>
  56 #include <poll.h>
  57 #include <pthread.h>
  58 #include <unistd.h>
  59 #include <sched.h>
  60 #include <signal.h>
  61 #ifdef HAVE_EVENTFD_SUPPORT
  62 #include <sys/eventfd.h>
  63 #endif
  64 #include <sys/mman.h>
  65 #include <sys/wait.h>
  66 #include <sys/types.h>
  67 #include <sys/stat.h>
  68 #include <fcntl.h>
  69 #include <linux/err.h>
  70 #include <linux/string.h>
  71 #include <linux/time64.h>
  72 #include <linux/zalloc.h>
  73 #include <linux/bitmap.h>
  74 #include <sys/time.h>
  75
  76 struct switch_output {
  77         bool             enabled;
  78         bool             signal;
  79         unsigned long    size;
  80         unsigned long    time;
  81         const char      *str;
  82         bool             set;
  83         char             **filenames;
  84         int              num_files;
  85         int              cur_file;
  86 };
  87
  88 struct record {
  89         struct perf_tool        tool;
  90         struct record_opts      opts;
  91         u64                     bytes_written;
  92         struct perf_data        data;
  93         struct auxtrace_record  *itr;
  94         struct evlist   *evlist;
  95         struct perf_session     *session;
  96         struct evlist           *sb_evlist;
  97         pthread_t               thread_id;
  98         int                     realtime_prio;
  99         bool                    switch_output_event_set;
 100         bool                    no_buildid;
 101         bool                    no_buildid_set;
 102         bool                    no_buildid_cache;
 103         bool                    no_buildid_cache_set;
 104         bool                    buildid_all;
 105         bool                    buildid_mmap;
 106         bool                    timestamp_filename;
 107         bool                    timestamp_boundary;
 108         struct switch_output    switch_output;
 109         unsigned long long      samples;
 110         struct mmap_cpu_mask    affinity_mask;
 111         unsigned long           output_max_size;        /* = 0: unlimited */
 112 };
 113
 114 static volatile int done;
 115
 116 static volatile int auxtrace_record__snapshot_started;
 117 static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
 118 static DEFINE_TRIGGER(switch_output_trigger);
 119
 120 static const char *affinity_tags[PERF_AFFINITY_MAX] = {
 121         "SYS", "NODE", "CPU"
 122 };
 123
 124 static bool switch_output_signal(struct record *rec)
 125 {
 126         return rec->switch_output.signal &&
 127                trigger_is_ready(&switch_output_trigger);
 128 }
 129
 130 static bool switch_output_size(struct record *rec)
 131 {
 132         return rec->switch_output.size &&
 133                trigger_is_ready(&switch_output_trigger) &&
 134                (rec->bytes_written >= rec->switch_output.size);
 135 }
 136
 137 static bool switch_output_time(struct record *rec)
 138 {
 139         return rec->switch_output.time &&
 140                trigger_is_ready(&switch_output_trigger);
 141 }
 142
 143 static bool record__output_max_size_exceeded(struct record *rec)
 144 {
 145         return rec->output_max_size &&
 146                (rec->bytes_written >= rec->output_max_size);
 147 }
 148
 149 static int record__write(struct record *rec, struct mmap *map __maybe_unused,
 150                          void *bf, size_t size)
 151 {
 152         struct perf_data_file *file = &rec->session->data->file;
 153
 154         if (perf_data_file__write(file, bf, size) < 0) {
 155                 pr_err("failed to write perf data, error: %m\n");
 156                 return -1;
 157         }
 158
 159         rec->bytes_written += size;
 160
 161         if (record__output_max_size_exceeded(rec) && !done) {
 162                 fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB),"
 163                                 " stopping session ]\n",
 164                                 rec->bytes_written >> 10);
 165                 done = 1;
 166         }
 167
 168         if (switch_output_size(rec))
 169                 trigger_hit(&switch_output_trigger);
 170
 171         return 0;
 172 }
 173
 174 static int record__aio_enabled(struct record *rec);
 175 static int record__comp_enabled(struct record *rec);
 176 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
 177                             void *src, size_t src_size);
 178
 179 #ifdef HAVE_AIO_SUPPORT
 180 static int record__aio_write(struct aiocb *cblock, int trace_fd,
 181                 void *buf, size_t size, off_t off)
 182 {
 183         int rc;
 184
 185         cblock->aio_fildes = trace_fd;
 186         cblock->aio_buf    = buf;
 187         cblock->aio_nbytes = size;
 188         cblock->aio_offset = off;
 189         cblock->aio_sigevent.sigev_notify = SIGEV_NONE;
 190
 191         do {
 192                 rc = aio_write(cblock);
 193                 if (rc == 0) {
 194                         break;
 195                 } else if (errno != EAGAIN) {
 196                         cblock->aio_fildes = -1;
 197                         pr_err("failed to queue perf data, error: %m\n");
 198                         break;
 199                 }
 200         } while (1);
 201
 202         return rc;
 203 }
 204
 205 static int record__aio_complete(struct mmap *md, struct aiocb *cblock)
 206 {
 207         void *rem_buf;
 208         off_t rem_off;
 209         size_t rem_size;
 210         int rc, aio_errno;
 211         ssize_t aio_ret, written;
 212
 213         aio_errno = aio_error(cblock);
 214         if (aio_errno == EINPROGRESS)
 215                 return 0;
 216
 217         written = aio_ret = aio_return(cblock);
 218         if (aio_ret < 0) {
 219                 if (aio_errno != EINTR)
 220                         pr_err("failed to write perf data, error: %m\n");
 221                 written = 0;
 222         }
 223
 224         rem_size = cblock->aio_nbytes - written;
 225
 226         if (rem_size == 0) {
 227                 cblock->aio_fildes = -1;
 228                 /*
 229                  * md->refcount is incremented in record__aio_pushfn() for
 230                  * every aio write request started in record__aio_push() so
 231                  * decrement it because the request is now complete.
 232                  */
 233                 perf_mmap__put(&md->core);
 234                 rc = 1;
 235         } else {
 236                 /*
 237                  * aio write request may require restart with the
 238                  * reminder if the kernel didn't write whole
 239                  * chunk at once.
 240                  */
 241                 rem_off = cblock->aio_offset + written;
 242                 rem_buf = (void *)(cblock->aio_buf + written);
 243                 record__aio_write(cblock, cblock->aio_fildes,
 244                                 rem_buf, rem_size, rem_off);
 245                 rc = 0;
 246         }
 247
 248         return rc;
 249 }
 250
 251 static int record__aio_sync(struct mmap *md, bool sync_all)
 252 {
 253         struct aiocb **aiocb = md->aio.aiocb;
 254         struct aiocb *cblocks = md->aio.cblocks;
 255         struct timespec timeout = { 0, 1000 * 1000  * 1 }; /* 1ms */
 256         int i, do_suspend;
 257
 258         do {
 259                 do_suspend = 0;
 260                 for (i = 0; i < md->aio.nr_cblocks; ++i) {
 261                         if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) {
 262                                 if (sync_all)
 263                                         aiocb[i] = NULL;
 264                                 else
 265                                         return i;
 266                         } else {
 267                                 /*
 268                                  * Started aio write is not complete yet
 269                                  * so it has to be waited before the
 270                                  * next allocation.
 271                                  */
 272                                 aiocb[i] = &cblocks[i];
 273                                 do_suspend = 1;
 274                         }
 275                 }
 276                 if (!do_suspend)
 277                         return -1;
 278
 279                 while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) {
 280                         if (!(errno == EAGAIN || errno == EINTR))
 281                                 pr_err("failed to sync perf data, error: %m\n");
 282                 }
 283         } while (1);
 284 }
 285
 286 struct record_aio {
 287         struct record   *rec;
 288         void            *data;
 289         size_t          size;
 290 };
 291
 292 static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size)
 293 {
 294         struct record_aio *aio = to;
 295
 296         /*
 297          * map->core.base data pointed by buf is copied into free map->aio.data[] buffer
 298          * to release space in the kernel buffer as fast as possible, calling
 299          * perf_mmap__consume() from perf_mmap__push() function.
 300          *
 301          * That lets the kernel to proceed with storing more profiling data into
 302          * the kernel buffer earlier than other per-cpu kernel buffers are handled.
 303          *
 304          * Coping can be done in two steps in case the chunk of profiling data
 305          * crosses the upper bound of the kernel buffer. In this case we first move
 306          * part of data from map->start till the upper bound and then the reminder
 307          * from the beginning of the kernel buffer till the end of the data chunk.
 308          */
 309
 310         if (record__comp_enabled(aio->rec)) {
 311                 size = zstd_compress(aio->rec->session, aio->data + aio->size,
 312                                      mmap__mmap_len(map) - aio->size,
 313                                      buf, size);
 314         } else {
 315                 memcpy(aio->data + aio->size, buf, size);
 316         }
 317
 318         if (!aio->size) {
 319                 /*
 320                  * Increment map->refcount to guard map->aio.data[] buffer
 321                  * from premature deallocation because map object can be
 322                  * released earlier than aio write request started on
 323                  * map->aio.data[] buffer is complete.
 324                  *
 325                  * perf_mmap__put() is done at record__aio_complete()
 326                  * after started aio request completion or at record__aio_push()
 327                  * if the request failed to start.
 328                  */
 329                 perf_mmap__get(&map->core);
 330         }
 331
 332         aio->size += size;
 333
 334         return size;
 335 }
 336
 337 static int record__aio_push(struct record *rec, struct mmap *map, off_t *off)
 338 {
 339         int ret, idx;
 340         int trace_fd = rec->session->data->file.fd;
 341         struct record_aio aio = { .rec = rec, .size = 0 };
 342
 343         /*
 344          * Call record__aio_sync() to wait till map->aio.data[] buffer
 345          * becomes available after previous aio write operation.
 346          */
 347
 348         idx = record__aio_sync(map, false);
 349         aio.data = map->aio.data[idx];
 350         ret = perf_mmap__push(map, &aio, record__aio_pushfn);
 351         if (ret != 0) /* ret > 0 - no data, ret < 0 - error */
 352                 return ret;
 353
 354         rec->samples++;
 355         ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off);
 356         if (!ret) {
 357                 *off += aio.size;
 358                 rec->bytes_written += aio.size;
 359                 if (switch_output_size(rec))
 360                         trigger_hit(&switch_output_trigger);
 361         } else {
 362                 /*
 363                  * Decrement map->refcount incremented in record__aio_pushfn()
 364                  * back if record__aio_write() operation failed to start, otherwise
 365                  * map->refcount is decremented in record__aio_complete() after
 366                  * aio write operation finishes successfully.
 367                  */
 368                 perf_mmap__put(&map->core);
 369         }
 370
 371         return ret;
 372 }
 373
 374 static off_t record__aio_get_pos(int trace_fd)
 375 {
 376         return lseek(trace_fd, 0, SEEK_CUR);
 377 }
 378
 379 static void record__aio_set_pos(int trace_fd, off_t pos)
 380 {
 381         lseek(trace_fd, pos, SEEK_SET);
 382 }
 383
 384 static void record__aio_mmap_read_sync(struct record *rec)
 385 {
 386         int i;
 387         struct evlist *evlist = rec->evlist;
 388         struct mmap *maps = evlist->mmap;
 389
 390         if (!record__aio_enabled(rec))
 391                 return;
 392
 393         for (i = 0; i < evlist->core.nr_mmaps; i++) {
 394                 struct mmap *map = &maps[i];
 395
 396                 if (map->core.base)
 397                         record__aio_sync(map, true);
 398         }
 399 }
 400
 401 static int nr_cblocks_default = 1;
 402 static int nr_cblocks_max = 4;
 403
 404 static int record__aio_parse(const struct option *opt,
 405                              const char *str,
 406                              int unset)
 407 {
 408         struct record_opts *opts = (struct record_opts *)opt->value;
 409
 410         if (unset) {
 411                 opts->nr_cblocks = 0;
 412         } else {
 413                 if (str)
 414                         opts->nr_cblocks = strtol(str, NULL, 0);
 415                 if (!opts->nr_cblocks)
 416                         opts->nr_cblocks = nr_cblocks_default;
 417         }
 418
 419         return 0;
 420 }
 421 #else /* HAVE_AIO_SUPPORT */
 422 static int nr_cblocks_max = 0;
 423
 424 static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused,
 425                             off_t *off __maybe_unused)
 426 {
 427         return -1;
 428 }
 429
 430 static off_t record__aio_get_pos(int trace_fd __maybe_unused)
 431 {
 432         return -1;
 433 }
 434
 435 static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused)
 436 {
 437 }
 438
 439 static void record__aio_mmap_read_sync(struct record *rec __maybe_unused)
 440 {
 441 }
 442 #endif
 443
 444 static int record__aio_enabled(struct record *rec)
 445 {
 446         return rec->opts.nr_cblocks > 0;
 447 }
 448
 449 #define MMAP_FLUSH_DEFAULT 1
 450 static int record__mmap_flush_parse(const struct option *opt,
 451                                     const char *str,
 452                                     int unset)
 453 {
 454         int flush_max;
 455         struct record_opts *opts = (struct record_opts *)opt->value;
 456         static struct parse_tag tags[] = {
 457                         { .tag  = 'B', .mult = 1       },
 458                         { .tag  = 'K', .mult = 1 << 10 },
 459                         { .tag  = 'M', .mult = 1 << 20 },
 460                         { .tag  = 'G', .mult = 1 << 30 },
 461                         { .tag  = 0 },
 462         };
 463
 464         if (unset)
 465                 return 0;
 466
 467         if (str) {
 468                 opts->mmap_flush = parse_tag_value(str, tags);
 469                 if (opts->mmap_flush == (int)-1)
 470                         opts->mmap_flush = strtol(str, NULL, 0);
 471         }
 472
 473         if (!opts->mmap_flush)
 474                 opts->mmap_flush = MMAP_FLUSH_DEFAULT;
 475
 476         flush_max = evlist__mmap_size(opts->mmap_pages);
 477         flush_max /= 4;
 478         if (opts->mmap_flush > flush_max)
 479                 opts->mmap_flush = flush_max;
 480
 481         return 0;
 482 }
 483
 484 #ifdef HAVE_ZSTD_SUPPORT
 485 static unsigned int comp_level_default = 1;
 486
 487 static int record__parse_comp_level(const struct option *opt, const char *str, int unset)
 488 {
 489         struct record_opts *opts = opt->value;
 490
 491         if (unset) {
 492                 opts->comp_level = 0;
 493         } else {
 494                 if (str)
 495                         opts->comp_level = strtol(str, NULL, 0);
 496                 if (!opts->comp_level)
 497                         opts->comp_level = comp_level_default;
 498         }
 499
 500         return 0;
 501 }
 502 #endif
 503 static unsigned int comp_level_max = 22;
 504
 505 static int record__comp_enabled(struct record *rec)
 506 {
 507         return rec->opts.comp_level > 0;
 508 }
 509
 510 static int process_synthesized_event(struct perf_tool *tool,
 511                                      union perf_event *event,
 512                                      struct perf_sample *sample __maybe_unused,
 513                                      struct machine *machine __maybe_unused)
 514 {
 515         struct record *rec = container_of(tool, struct record, tool);
 516         return record__write(rec, NULL, event, event->header.size);
 517 }
 518
 519 static int process_locked_synthesized_event(struct perf_tool *tool,
 520                                      union perf_event *event,
 521                                      struct perf_sample *sample __maybe_unused,
 522                                      struct machine *machine __maybe_unused)
 523 {
 524         static pthread_mutex_t synth_lock = PTHREAD_MUTEX_INITIALIZER;
 525         int ret;
 526
 527         pthread_mutex_lock(&synth_lock);
 528         ret = process_synthesized_event(tool, event, sample, machine);
 529         pthread_mutex_unlock(&synth_lock);
 530         return ret;
 531 }
 532
 533 static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
 534 {
 535         struct record *rec = to;
 536
 537         if (record__comp_enabled(rec)) {
 538                 size = zstd_compress(rec->session, map->data, mmap__mmap_len(map), bf, size);
 539                 bf   = map->data;
 540         }
 541
 542         rec->samples++;
 543         return record__write(rec, map, bf, size);
 544 }
 545
 546 static volatile int signr = -1;
 547 static volatile int child_finished;
 548 #ifdef HAVE_EVENTFD_SUPPORT
 549 static int done_fd = -1;
 550 #endif
 551
 552 static void sig_handler(int sig)
 553 {
 554         if (sig == SIGCHLD)
 555                 child_finished = 1;
 556         else
 557                 signr = sig;
 558
 559         done = 1;
 560 #ifdef HAVE_EVENTFD_SUPPORT
 561 {
 562         u64 tmp = 1;
 563         /*
 564          * It is possible for this signal handler to run after done is checked
 565          * in the main loop, but before the perf counter fds are polled. If this
 566          * happens, the poll() will continue to wait even though done is set,
 567          * and will only break out if either another signal is received, or the
 568          * counters are ready for read. To ensure the poll() doesn't sleep when
 569          * done is set, use an eventfd (done_fd) to wake up the poll().
 570          */
 571         if (write(done_fd, &tmp, sizeof(tmp)) < 0)
 572                 pr_err("failed to signal wakeup fd, error: %m\n");
 573 }
 574 #endif // HAVE_EVENTFD_SUPPORT
 575 }
 576
 577 static void sigsegv_handler(int sig)
 578 {
 579         perf_hooks__recover();
 580         sighandler_dump_stack(sig);
 581 }
 582
 583 static void record__sig_exit(void)
 584 {
 585         if (signr == -1)
 586                 return;
 587
 588         signal(signr, SIG_DFL);
 589         raise(signr);
 590 }
 591
 592 #ifdef HAVE_AUXTRACE_SUPPORT
 593
 594 static int record__process_auxtrace(struct perf_tool *tool,
 595                                     struct mmap *map,
 596                                     union perf_event *event, void *data1,
 597                                     size_t len1, void *data2, size_t len2)
 598 {
 599         struct record *rec = container_of(tool, struct record, tool);
 600         struct perf_data *data = &rec->data;
 601         size_t padding;
 602         u8 pad[8] = {0};
 603
 604         if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) {
 605                 off_t file_offset;
 606                 int fd = perf_data__fd(data);
 607                 int err;
 608
 609                 file_offset = lseek(fd, 0, SEEK_CUR);
 610                 if (file_offset == -1)
 611                         return -1;
 612                 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
 613                                                      event, file_offset);
 614                 if (err)
 615                         return err;
 616         }
 617
 618         /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
 619         padding = (len1 + len2) & 7;
 620         if (padding)
 621                 padding = 8 - padding;
 622
 623         record__write(rec, map, event, event->header.size);
 624         record__write(rec, map, data1, len1);
 625         if (len2)
 626                 record__write(rec, map, data2, len2);
 627         record__write(rec, map, &pad, padding);
 628
 629         return 0;
 630 }
 631
 632 static int record__auxtrace_mmap_read(struct record *rec,
 633                                       struct mmap *map)
 634 {
 635         int ret;
 636
 637         ret = auxtrace_mmap__read(map, rec->itr, &rec->tool,
 638                                   record__process_auxtrace);
 639         if (ret < 0)
 640                 return ret;
 641
 642         if (ret)
 643                 rec->samples++;
 644
 645         return 0;
 646 }
 647
 648 static int record__auxtrace_mmap_read_snapshot(struct record *rec,
 649                                                struct mmap *map)
 650 {
 651         int ret;
 652
 653         ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool,
 654                                            record__process_auxtrace,
 655                                            rec->opts.auxtrace_snapshot_size);
 656         if (ret < 0)
 657                 return ret;
 658
 659         if (ret)
 660                 rec->samples++;
 661
 662         return 0;
 663 }
 664
 665 static int record__auxtrace_read_snapshot_all(struct record *rec)
 666 {
 667         int i;
 668         int rc = 0;
 669
 670         for (i = 0; i < rec->evlist->core.nr_mmaps; i++) {
 671                 struct mmap *map = &rec->evlist->mmap[i];
 672
 673                 if (!map->auxtrace_mmap.base)
 674                         continue;
 675
 676                 if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) {
 677                         rc = -1;
 678                         goto out;
 679                 }
 680         }
 681 out:
 682         return rc;
 683 }
 684
 685 static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit)
 686 {
 687         pr_debug("Recording AUX area tracing snapshot\n");
 688         if (record__auxtrace_read_snapshot_all(rec) < 0) {
 689                 trigger_error(&auxtrace_snapshot_trigger);
 690         } else {
 691                 if (auxtrace_record__snapshot_finish(rec->itr, on_exit))
 692                         trigger_error(&auxtrace_snapshot_trigger);
 693                 else
 694                         trigger_ready(&auxtrace_snapshot_trigger);
 695         }
 696 }
 697
 698 static int record__auxtrace_snapshot_exit(struct record *rec)
 699 {
 700         if (trigger_is_error(&auxtrace_snapshot_trigger))
 701                 return 0;
 702
 703         if (!auxtrace_record__snapshot_started &&
 704             auxtrace_record__snapshot_start(rec->itr))
 705                 return -1;
 706
 707         record__read_auxtrace_snapshot(rec, true);
 708         if (trigger_is_error(&auxtrace_snapshot_trigger))
 709                 return -1;
 710
 711         return 0;
 712 }
 713
 714 static int record__auxtrace_init(struct record *rec)
 715 {
 716         int err;
 717
 718         if (!rec->itr) {
 719                 rec->itr = auxtrace_record__init(rec->evlist, &err);
 720                 if (err)
 721                         return err;
 722         }
 723
 724         err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
 725                                               rec->opts.auxtrace_snapshot_opts);
 726         if (err)
 727                 return err;
 728
 729         err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts,
 730                                             rec->opts.auxtrace_sample_opts);
 731         if (err)
 732                 return err;
 733
 734         auxtrace_regroup_aux_output(rec->evlist);
 735
 736         return auxtrace_parse_filters(rec->evlist);
 737 }
 738
 739 #else
 740
 741 static inline
 742 int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
 743                                struct mmap *map __maybe_unused)
 744 {
 745         return 0;
 746 }
 747
 748 static inline
 749 void record__read_auxtrace_snapshot(struct record *rec __maybe_unused,
 750                                     bool on_exit __maybe_unused)
 751 {
 752 }
 753
 754 static inline
 755 int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
 756 {
 757         return 0;
 758 }
 759
 760 static inline
 761 int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused)
 762 {
 763         return 0;
 764 }
 765
 766 static int record__auxtrace_init(struct record *rec __maybe_unused)
 767 {
 768         return 0;
 769 }
 770
 771 #endif
 772
 773 static int record__config_text_poke(struct evlist *evlist)
 774 {
 775         struct evsel *evsel;
 776         int err;
 777
 778         /* Nothing to do if text poke is already configured */
 779         evlist__for_each_entry(evlist, evsel) {
 780                 if (evsel->core.attr.text_poke)
 781                         return 0;
 782         }
 783
 784         err = parse_events(evlist, "dummy:u", NULL);
 785         if (err)
 786                 return err;
 787
 788         evsel = evlist__last(evlist);
 789
 790         evsel->core.attr.freq = 0;
 791         evsel->core.attr.sample_period = 1;
 792         evsel->core.attr.text_poke = 1;
 793         evsel->core.attr.ksymbol = 1;
 794
 795         evsel->core.system_wide = true;
 796         evsel->no_aux_samples = true;
 797         evsel->immediate = true;
 798
 799         /* Text poke must be collected on all CPUs */
 800         perf_cpu_map__put(evsel->core.own_cpus);
 801         evsel->core.own_cpus = perf_cpu_map__new(NULL);
 802         perf_cpu_map__put(evsel->core.cpus);
 803         evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus);
 804
 805         evsel__set_sample_bit(evsel, TIME);
 806
 807         return 0;
 808 }
 809
 810 static bool record__kcore_readable(struct machine *machine)
 811 {
 812         char kcore[PATH_MAX];
 813         int fd;
 814
 815         scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir);
 816
 817         fd = open(kcore, O_RDONLY);
 818         if (fd < 0)
 819                 return false;
 820
 821         close(fd);
 822
 823         return true;
 824 }
 825
 826 static int record__kcore_copy(struct machine *machine, struct perf_data *data)
 827 {
 828         char from_dir[PATH_MAX];
 829         char kcore_dir[PATH_MAX];
 830         int ret;
 831
 832         snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir);
 833
 834         ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir));
 835         if (ret)
 836                 return ret;
 837
 838         return kcore_copy(from_dir, kcore_dir);
 839 }
 840
 841 static int record__mmap_evlist(struct record *rec,
 842                                struct evlist *evlist)
 843 {
 844         struct record_opts *opts = &rec->opts;
 845         bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
 846                                   opts->auxtrace_sample_mode;
 847         char msg[512];
 848
 849         if (opts->affinity != PERF_AFFINITY_SYS)
 850                 cpu__setup_cpunode_map();
 851
 852         if (evlist__mmap_ex(evlist, opts->mmap_pages,
 853                                  opts->auxtrace_mmap_pages,
 854                                  auxtrace_overwrite,
 855                                  opts->nr_cblocks, opts->affinity,
 856                                  opts->mmap_flush, opts->comp_level) < 0) {
 857                 if (errno == EPERM) {
 858                         pr_err("Permission error mapping pages.\n"
 859                                "Consider increasing "
 860                                "/proc/sys/kernel/perf_event_mlock_kb,\n"
 861                                "or try again with a smaller value of -m/--mmap_pages.\n"
 862                                "(current value: %u,%u)\n",
 863                                opts->mmap_pages, opts->auxtrace_mmap_pages);
 864                         return -errno;
 865                 } else {
 866                         pr_err("failed to mmap with %d (%s)\n", errno,
 867                                 str_error_r(errno, msg, sizeof(msg)));
 868                         if (errno)
 869                                 return -errno;
 870                         else
 871                                 return -EINVAL;
 872                 }
 873         }
 874         return 0;
 875 }
 876
 877 static int record__mmap(struct record *rec)
 878 {
 879         return record__mmap_evlist(rec, rec->evlist);
 880 }
 881
 882 static int record__open(struct record *rec)
 883 {
 884         char msg[BUFSIZ];
 885         struct evsel *pos;
 886         struct evlist *evlist = rec->evlist;
 887         struct perf_session *session = rec->session;
 888         struct record_opts *opts = &rec->opts;
 889         int rc = 0;
 890
 891         /*
 892          * For initial_delay or system wide, we need to add a dummy event so
 893          * that we can track PERF_RECORD_MMAP to cover the delay of waiting or
 894          * event synthesis.
 895          */
 896         if (opts->initial_delay || target__has_cpu(&opts->target)) {
 897                 pos = evlist__get_tracking_event(evlist);
 898                 if (!evsel__is_dummy_event(pos)) {
 899                         /* Set up dummy event. */
 900                         if (evlist__add_dummy(evlist))
 901                                 return -ENOMEM;
 902                         pos = evlist__last(evlist);
 903                         evlist__set_tracking_event(evlist, pos);
 904                 }
 905
 906                 /*
 907                  * Enable the dummy event when the process is forked for
 908                  * initial_delay, immediately for system wide.
 909                  */
 910                 if (opts->initial_delay && !pos->immediate)
 911                         pos->core.attr.enable_on_exec = 1;
 912                 else
 913                         pos->immediate = 1;
 914         }
 915
 916         evlist__config(evlist, opts, &callchain_param);
 917
 918         evlist__for_each_entry(evlist, pos) {
 919 try_again:
 920                 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) {
 921                         if (evsel__fallback(pos, errno, msg, sizeof(msg))) {
 922                                 if (verbose > 0)
 923                                         ui__warning("%s\n", msg);
 924                                 goto try_again;
 925                         }
 926                         if ((errno == EINVAL || errno == EBADF) &&
 927                             pos->leader != pos &&
 928                             pos->weak_group) {
 929                                 pos = evlist__reset_weak_group(evlist, pos, true);
 930                                 goto try_again;
 931                         }
 932                         rc = -errno;
 933                         evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg));
 934                         ui__error("%s\n", msg);
 935                         goto out;
 936                 }
 937
 938                 pos->supported = true;
 939         }
 940
 941         if (symbol_conf.kptr_restrict && !evlist__exclude_kernel(evlist)) {
 942                 pr_warning(
 943 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
 944 "check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
 945 "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
 946 "file is not found in the buildid cache or in the vmlinux path.\n\n"
 947 "Samples in kernel modules won't be resolved at all.\n\n"
 948 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
 949 "even with a suitable vmlinux or kallsyms file.\n\n");
 950         }
 951
 952         if (evlist__apply_filters(evlist, &pos)) {
 953                 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
 954                         pos->filter, evsel__name(pos), errno,
 955                         str_error_r(errno, msg, sizeof(msg)));
 956                 rc = -1;
 957                 goto out;
 958         }
 959
 960         rc = record__mmap(rec);
 961         if (rc)
 962                 goto out;
 963
 964         session->evlist = evlist;
 965         perf_session__set_id_hdr_size(session);
 966 out:
 967         return rc;
 968 }
 969
 970 static int process_sample_event(struct perf_tool *tool,
 971                                 union perf_event *event,
 972                                 struct perf_sample *sample,
 973                                 struct evsel *evsel,
 974                                 struct machine *machine)
 975 {
 976         struct record *rec = container_of(tool, struct record, tool);
 977
 978         if (rec->evlist->first_sample_time == 0)
 979                 rec->evlist->first_sample_time = sample->time;
 980
 981         rec->evlist->last_sample_time = sample->time;
 982
 983         if (rec->buildid_all)
 984                 return 0;
 985
 986         rec->samples++;
 987         return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
 988 }
 989
 990 static int process_buildids(struct record *rec)
 991 {
 992         struct perf_session *session = rec->session;
 993
 994         if (perf_data__size(&rec->data) == 0)
 995                 return 0;
 996
 997         /*
 998          * During this process, it'll load kernel map and replace the
 999          * dso->long_name to a real pathname it found.  In this case
1000          * we prefer the vmlinux path like
1001          *   /lib/modules/3.16.4/build/vmlinux
1002          *
1003          * rather than build-id path (in debug directory).
1004          *   $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
1005          */
1006         symbol_conf.ignore_vmlinux_buildid = true;
1007
1008         /*
1009          * If --buildid-all is given, it marks all DSO regardless of hits,
1010          * so no need to process samples. But if timestamp_boundary is enabled,
1011          * it still needs to walk on all samples to get the timestamps of
1012          * first/last samples.
1013          */
1014         if (rec->buildid_all && !rec->timestamp_boundary)
1015                 rec->tool.sample = NULL;
1016
1017         return perf_session__process_events(session);
1018 }
1019
1020 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
1021 {
1022         int err;
1023         struct perf_tool *tool = data;
1024         /*
1025          *As for guest kernel when processing subcommand record&report,
1026          *we arrange module mmap prior to guest kernel mmap and trigger
1027          *a preload dso because default guest module symbols are loaded
1028          *from guest kallsyms instead of /lib/modules/XXX/XXX. This
1029          *method is used to avoid symbol missing when the first addr is
1030          *in module instead of in guest kernel.
1031          */
1032         err = perf_event__synthesize_modules(tool, process_synthesized_event,
1033                                              machine);
1034         if (err < 0)
1035                 pr_err("Couldn't record guest kernel [%d]'s reference"
1036                        " relocation symbol.\n", machine->pid);
1037
1038         /*
1039          * We use _stext for guest kernel because guest kernel's /proc/kallsyms
1040          * have no _text sometimes.
1041          */
1042         err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1043                                                  machine);
1044         if (err < 0)
1045                 pr_err("Couldn't record guest kernel [%d]'s reference"
1046                        " relocation symbol.\n", machine->pid);
1047 }
1048
1049 static struct perf_event_header finished_round_event = {
1050         .size = sizeof(struct perf_event_header),
1051         .type = PERF_RECORD_FINISHED_ROUND,
1052 };
1053
1054 static void record__adjust_affinity(struct record *rec, struct mmap *map)
1055 {
1056         if (rec->opts.affinity != PERF_AFFINITY_SYS &&
1057             !bitmap_equal(rec->affinity_mask.bits, map->affinity_mask.bits,
1058                           rec->affinity_mask.nbits)) {
1059                 bitmap_zero(rec->affinity_mask.bits, rec->affinity_mask.nbits);
1060                 bitmap_or(rec->affinity_mask.bits, rec->affinity_mask.bits,
1061                           map->affinity_mask.bits, rec->affinity_mask.nbits);
1062                 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&rec->affinity_mask),
1063                                   (cpu_set_t *)rec->affinity_mask.bits);
1064                 if (verbose == 2)
1065                         mmap_cpu_mask__scnprintf(&rec->affinity_mask, "thread");
1066         }
1067 }
1068
1069 static size_t process_comp_header(void *record, size_t increment)
1070 {
1071         struct perf_record_compressed *event = record;
1072         size_t size = sizeof(*event);
1073
1074         if (increment) {
1075                 event->header.size += increment;
1076                 return increment;
1077         }
1078
1079         event->header.type = PERF_RECORD_COMPRESSED;
1080         event->header.size = size;
1081
1082         return size;
1083 }
1084
1085 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
1086                             void *src, size_t src_size)
1087 {
1088         size_t compressed;
1089         size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
1090
1091         compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size,
1092                                                      max_record_size, process_comp_header);
1093
1094         session->bytes_transferred += src_size;
1095         session->bytes_compressed  += compressed;
1096
1097         return compressed;
1098 }
1099
1100 static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
1101                                     bool overwrite, bool synch)
1102 {
1103         u64 bytes_written = rec->bytes_written;
1104         int i;
1105         int rc = 0;
1106         struct mmap *maps;
1107         int trace_fd = rec->data.file.fd;
1108         off_t off = 0;
1109
1110         if (!evlist)
1111                 return 0;
1112
1113         maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
1114         if (!maps)
1115                 return 0;
1116
1117         if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
1118                 return 0;
1119
1120         if (record__aio_enabled(rec))
1121                 off = record__aio_get_pos(trace_fd);
1122
1123         for (i = 0; i < evlist->core.nr_mmaps; i++) {
1124                 u64 flush = 0;
1125                 struct mmap *map = &maps[i];
1126
1127                 if (map->core.base) {
1128                         record__adjust_affinity(rec, map);
1129                         if (synch) {
1130                                 flush = map->core.flush;
1131                                 map->core.flush = 1;
1132                         }
1133                         if (!record__aio_enabled(rec)) {
1134                                 if (perf_mmap__push(map, rec, record__pushfn) < 0) {
1135                                         if (synch)
1136                                                 map->core.flush = flush;
1137                                         rc = -1;
1138                                         goto out;
1139                                 }
1140                         } else {
1141                                 if (record__aio_push(rec, map, &off) < 0) {
1142                                         record__aio_set_pos(trace_fd, off);
1143                                         if (synch)
1144                                                 map->core.flush = flush;
1145                                         rc = -1;
1146                                         goto out;
1147                                 }
1148                         }
1149                         if (synch)
1150                                 map->core.flush = flush;
1151                 }
1152
1153                 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
1154                     !rec->opts.auxtrace_sample_mode &&
1155                     record__auxtrace_mmap_read(rec, map) != 0) {
1156                         rc = -1;
1157                         goto out;
1158                 }
1159         }
1160
1161         if (record__aio_enabled(rec))
1162                 record__aio_set_pos(trace_fd, off);
1163
1164         /*
1165          * Mark the round finished in case we wrote
1166          * at least one event.
1167          */
1168         if (bytes_written != rec->bytes_written)
1169                 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));
1170
1171         if (overwrite)
1172                 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
1173 out:
1174         return rc;
1175 }
1176
1177 static int record__mmap_read_all(struct record *rec, bool synch)
1178 {
1179         int err;
1180
1181         err = record__mmap_read_evlist(rec, rec->evlist, false, synch);
1182         if (err)
1183                 return err;
1184
1185         return record__mmap_read_evlist(rec, rec->evlist, true, synch);
1186 }
1187
1188 static void record__init_features(struct record *rec)
1189 {
1190         struct perf_session *session = rec->session;
1191         int feat;
1192
1193         for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1194                 perf_header__set_feat(&session->header, feat);
1195
1196         if (rec->no_buildid)
1197                 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1198
1199         if (!have_tracepoints(&rec->evlist->core.entries))
1200                 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1201
1202         if (!rec->opts.branch_stack)
1203                 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1204
1205         if (!rec->opts.full_auxtrace)
1206                 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1207
1208         if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
1209                 perf_header__clear_feat(&session->header, HEADER_CLOCKID);
1210
1211         if (!rec->opts.use_clockid)
1212                 perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);
1213
1214         perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1215         if (!record__comp_enabled(rec))
1216                 perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
1217
1218         perf_header__clear_feat(&session->header, HEADER_STAT);
1219 }
1220
1221 static void
1222 record__finish_output(struct record *rec)
1223 {
1224         struct perf_data *data = &rec->data;
1225         int fd = perf_data__fd(data);
1226
1227         if (data->is_pipe)
1228                 return;
1229
1230         rec->session->header.data_size += rec->bytes_written;
1231         data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
1232
1233         if (!rec->no_buildid) {
1234                 process_buildids(rec);
1235
1236                 if (rec->buildid_all)
1237                         dsos__hit_all(rec->session);
1238         }
1239         perf_session__write_header(rec->session, rec->evlist, fd, true);
1240
1241         return;
1242 }
1243
1244 static int record__synthesize_workload(struct record *rec, bool tail)
1245 {
1246         int err;
1247         struct perf_thread_map *thread_map;
1248
1249         if (rec->opts.tail_synthesize != tail)
1250                 return 0;
1251
1252         thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
1253         if (thread_map == NULL)
1254                 return -1;
1255
1256         err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
1257                                                  process_synthesized_event,
1258                                                  &rec->session->machines.host,
1259                                                  rec->opts.sample_address);
1260         perf_thread_map__put(thread_map);
1261         return err;
1262 }
1263
1264 static int record__synthesize(struct record *rec, bool tail);
1265
1266 static int
1267 record__switch_output(struct record *rec, bool at_exit)
1268 {
1269         struct perf_data *data = &rec->data;
1270         int fd, err;
1271         char *new_filename;
1272
1273         /* Same Size:      "2015122520103046"*/
1274         char timestamp[] = "InvalidTimestamp";
1275
1276         record__aio_mmap_read_sync(rec);
1277
1278         record__synthesize(rec, true);
1279         if (target__none(&rec->opts.target))
1280                 record__synthesize_workload(rec, true);
1281
1282         rec->samples = 0;
1283         record__finish_output(rec);
1284         err = fetch_current_timestamp(timestamp, sizeof(timestamp));
1285         if (err) {
1286                 pr_err("Failed to get current timestamp\n");
1287                 return -EINVAL;
1288         }
1289
1290         fd = perf_data__switch(data, timestamp,
1291                                     rec->session->header.data_offset,
1292                                     at_exit, &new_filename);
1293         if (fd >= 0 && !at_exit) {
1294                 rec->bytes_written = 0;
1295                 rec->session->header.data_size = 0;
1296         }
1297
1298         if (!quiet)
1299                 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
1300                         data->path, timestamp);
1301
1302         if (rec->switch_output.num_files) {
1303                 int n = rec->switch_output.cur_file + 1;
1304
1305                 if (n >= rec->switch_output.num_files)
1306                         n = 0;
1307                 rec->switch_output.cur_file = n;
1308                 if (rec->switch_output.filenames[n]) {
1309                         remove(rec->switch_output.filenames[n]);
1310                         zfree(&rec->switch_output.filenames[n]);
1311                 }
1312                 rec->switch_output.filenames[n] = new_filename;
1313         } else {
1314                 free(new_filename);
1315         }
1316
1317         /* Output tracking events */
1318         if (!at_exit) {
1319                 record__synthesize(rec, false);
1320
1321                 /*
1322                  * In 'perf record --switch-output' without -a,
1323                  * record__synthesize() in record__switch_output() won't
1324                  * generate tracking events because there's no thread_map
1325                  * in evlist. Which causes newly created perf.data doesn't
1326                  * contain map and comm information.
1327                  * Create a fake thread_map and directly call
1328                  * perf_event__synthesize_thread_map() for those events.
1329                  */
1330                 if (target__none(&rec->opts.target))
1331                         record__synthesize_workload(rec, false);
1332         }
1333         return fd;
1334 }
1335
1336 static volatile int workload_exec_errno;
1337
1338 /*
1339  * evlist__prepare_workload will send a SIGUSR1
1340  * if the fork fails, since we asked by setting its
1341  * want_signal to true.
1342  */
1343 static void workload_exec_failed_signal(int signo __maybe_unused,
1344                                         siginfo_t *info,
1345                                         void *ucontext __maybe_unused)
1346 {
1347         workload_exec_errno = info->si_value.sival_int;
1348         done = 1;
1349         child_finished = 1;
1350 }
1351
1352 static void snapshot_sig_handler(int sig);
1353 static void alarm_sig_handler(int sig);
1354
1355 static const struct perf_event_mmap_page *evlist__pick_pc(struct evlist *evlist)
1356 {
1357         if (evlist) {
1358                 if (evlist->mmap && evlist->mmap[0].core.base)
1359                         return evlist->mmap[0].core.base;
1360                 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base)
1361                         return evlist->overwrite_mmap[0].core.base;
1362         }
1363         return NULL;
1364 }
1365
1366 static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
1367 {
1368         const struct perf_event_mmap_page *pc = evlist__pick_pc(rec->evlist);
1369         if (pc)
1370                 return pc;
1371         return NULL;
1372 }
1373
1374 static int record__synthesize(struct record *rec, bool tail)
1375 {
1376         struct perf_session *session = rec->session;
1377         struct machine *machine = &session->machines.host;
1378         struct perf_data *data = &rec->data;
1379         struct record_opts *opts = &rec->opts;
1380         struct perf_tool *tool = &rec->tool;
1381         int fd = perf_data__fd(data);
1382         int err = 0;
1383         event_op f = process_synthesized_event;
1384
1385         if (rec->opts.tail_synthesize != tail)
1386                 return 0;
1387
1388         if (data->is_pipe) {
1389                 /*
1390                  * We need to synthesize events first, because some
1391                  * features works on top of them (on report side).
1392                  */
1393                 err = perf_event__synthesize_attrs(tool, rec->evlist,
1394                                                    process_synthesized_event);
1395                 if (err < 0) {
1396                         pr_err("Couldn't synthesize attrs.\n");
1397                         goto out;
1398                 }
1399
1400                 err = perf_event__synthesize_features(tool, session, rec->evlist,
1401                                                       process_synthesized_event);
1402                 if (err < 0) {
1403                         pr_err("Couldn't synthesize features.\n");
1404                         return err;
1405                 }
1406
1407                 if (have_tracepoints(&rec->evlist->core.entries)) {
1408                         /*
1409                          * FIXME err <= 0 here actually means that
1410                          * there were no tracepoints so its not really
1411                          * an error, just that we don't need to
1412                          * synthesize anything.  We really have to
1413                          * return this more properly and also
1414                          * propagate errors that now are calling die()
1415                          */
1416                         err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist,
1417                                                                   process_synthesized_event);
1418                         if (err <= 0) {
1419                                 pr_err("Couldn't record tracing data.\n");
1420                                 goto out;
1421                         }
1422                         rec->bytes_written += err;
1423                 }
1424         }
1425
1426         err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
1427                                           process_synthesized_event, machine);
1428         if (err)
1429                 goto out;
1430
1431         /* Synthesize id_index before auxtrace_info */
1432         if (rec->opts.auxtrace_sample_mode) {
1433                 err = perf_event__synthesize_id_index(tool,
1434                                                       process_synthesized_event,
1435                                                       session->evlist, machine);
1436                 if (err)
1437                         goto out;
1438         }
1439
1440         if (rec->opts.full_auxtrace) {
1441                 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
1442                                         session, process_synthesized_event);
1443                 if (err)
1444                         goto out;
1445         }
1446
1447         if (!evlist__exclude_kernel(rec->evlist)) {
1448                 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1449                                                          machine);
1450                 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
1451                                    "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1452                                    "Check /proc/kallsyms permission or run as root.\n");
1453
1454                 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1455                                                      machine);
1456                 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
1457                                    "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1458                                    "Check /proc/modules permission or run as root.\n");
1459         }
1460
1461         if (perf_guest) {
1462                 machines__process_guests(&session->machines,
1463                                          perf_event__synthesize_guest_os, tool);
1464         }
1465
1466         err = perf_event__synthesize_extra_attr(&rec->tool,
1467                                                 rec->evlist,
1468                                                 process_synthesized_event,
1469                                                 data->is_pipe);
1470         if (err)
1471                 goto out;
1472
1473         err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads,
1474                                                  process_synthesized_event,
1475                                                 NULL);
1476         if (err < 0) {
1477                 pr_err("Couldn't synthesize thread map.\n");
1478                 return err;
1479         }
1480
1481         err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.cpus,
1482                                              process_synthesized_event, NULL);
1483         if (err < 0) {
1484                 pr_err("Couldn't synthesize cpu map.\n");
1485                 return err;
1486         }
1487
1488         err = perf_event__synthesize_bpf_events(session, process_synthesized_event,
1489                                                 machine, opts);
1490         if (err < 0)
1491                 pr_warning("Couldn't synthesize bpf events.\n");
1492
1493         err = perf_event__synthesize_cgroups(tool, process_synthesized_event,
1494                                              machine);
1495         if (err < 0)
1496                 pr_warning("Couldn't synthesize cgroup events.\n");
1497
1498         if (rec->opts.nr_threads_synthesize > 1) {
1499                 perf_set_multithreaded();
1500                 f = process_locked_synthesized_event;
1501         }
1502
1503         err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->core.threads,
1504                                             f, opts->sample_address,
1505                                             rec->opts.nr_threads_synthesize);
1506
1507         if (rec->opts.nr_threads_synthesize > 1)
1508                 perf_set_singlethreaded();
1509
1510 out:
1511         return err;
1512 }
1513
1514 static int record__process_signal_event(union perf_event *event __maybe_unused, void *data)
1515 {
1516         struct record *rec = data;
1517         pthread_kill(rec->thread_id, SIGUSR2);
1518         return 0;
1519 }
1520
1521 static int record__setup_sb_evlist(struct record *rec)
1522 {
1523         struct record_opts *opts = &rec->opts;
1524
1525         if (rec->sb_evlist != NULL) {
1526                 /*
1527                  * We get here if --switch-output-event populated the
1528                  * sb_evlist, so associate a callback that will send a SIGUSR2
1529                  * to the main thread.
1530                  */
1531                 evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec);
1532                 rec->thread_id = pthread_self();
1533         }
1534 #ifdef HAVE_LIBBPF_SUPPORT
1535         if (!opts->no_bpf_event) {
1536                 if (rec->sb_evlist == NULL) {
1537                         rec->sb_evlist = evlist__new();
1538
1539                         if (rec->sb_evlist == NULL) {
1540                                 pr_err("Couldn't create side band evlist.\n.");
1541                                 return -1;
1542                         }
1543                 }
1544
1545                 if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) {
1546                         pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
1547                         return -1;
1548                 }
1549         }
1550 #endif
1551         if (evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) {
1552                 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1553                 opts->no_bpf_event = true;
1554         }
1555
1556         return 0;
1557 }
1558
1559 static int record__init_clock(struct record *rec)
1560 {
1561         struct perf_session *session = rec->session;
1562         struct timespec ref_clockid;
1563         struct timeval ref_tod;
1564         u64 ref;
1565
1566         if (!rec->opts.use_clockid)
1567                 return 0;
1568
1569         if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
1570                 session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns;
1571
1572         session->header.env.clock.clockid = rec->opts.clockid;
1573
1574         if (gettimeofday(&ref_tod, NULL) != 0) {
1575                 pr_err("gettimeofday failed, cannot set reference time.\n");
1576                 return -1;
1577         }
1578
1579         if (clock_gettime(rec->opts.clockid, &ref_clockid)) {
1580                 pr_err("clock_gettime failed, cannot set reference time.\n");
1581                 return -1;
1582         }
1583
1584         ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC +
1585               (u64) ref_tod.tv_usec * NSEC_PER_USEC;
1586
1587         session->header.env.clock.tod_ns = ref;
1588
1589         ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC +
1590               (u64) ref_clockid.tv_nsec;
1591
1592         session->header.env.clock.clockid_ns = ref;
1593         return 0;
1594 }
1595
1596 static void hit_auxtrace_snapshot_trigger(struct record *rec)
1597 {
1598         if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
1599                 trigger_hit(&auxtrace_snapshot_trigger);
1600                 auxtrace_record__snapshot_started = 1;
1601                 if (auxtrace_record__snapshot_start(rec->itr))
1602                         trigger_error(&auxtrace_snapshot_trigger);
1603         }
1604 }
1605
1606 static int __cmd_record(struct record *rec, int argc, const char **argv)
1607 {
1608         int err;
1609         int status = 0;
1610         unsigned long waking = 0;
1611         const bool forks = argc > 0;
1612         struct perf_tool *tool = &rec->tool;
1613         struct record_opts *opts = &rec->opts;
1614         struct perf_data *data = &rec->data;
1615         struct perf_session *session;
1616         bool disabled = false, draining = false;
1617         int fd;
1618         float ratio = 0;
1619         enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
1620
1621         atexit(record__sig_exit);
1622         signal(SIGCHLD, sig_handler);
1623         signal(SIGINT, sig_handler);
1624         signal(SIGTERM, sig_handler);
1625         signal(SIGSEGV, sigsegv_handler);
1626
1627         if (rec->opts.record_namespaces)
1628                 tool->namespace_events = true;
1629
1630         if (rec->opts.record_cgroup) {
1631 #ifdef HAVE_FILE_HANDLE
1632                 tool->cgroup_events = true;
1633 #else
1634                 pr_err("cgroup tracking is not supported\n");
1635                 return -1;
1636 #endif
1637         }
1638
1639         if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
1640                 signal(SIGUSR2, snapshot_sig_handler);
1641                 if (rec->opts.auxtrace_snapshot_mode)
1642                         trigger_on(&auxtrace_snapshot_trigger);
1643                 if (rec->switch_output.enabled)
1644                         trigger_on(&switch_output_trigger);
1645         } else {
1646                 signal(SIGUSR2, SIG_IGN);
1647         }
1648
1649         session = perf_session__new(data, false, tool);
1650         if (IS_ERR(session)) {
1651                 pr_err("Perf session creation failed.\n");
1652                 return PTR_ERR(session);
1653         }
1654
1655         fd = perf_data__fd(data);
1656         rec->session = session;
1657
1658         if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
1659                 pr_err("Compression initialization failed.\n");
1660                 return -1;
1661         }
1662 #ifdef HAVE_EVENTFD_SUPPORT
1663         done_fd = eventfd(0, EFD_NONBLOCK);
1664         if (done_fd < 0) {
1665                 pr_err("Failed to create wakeup eventfd, error: %m\n");
1666                 status = -1;
1667                 goto out_delete_session;
1668         }
1669         err = evlist__add_wakeup_eventfd(rec->evlist, done_fd);
1670         if (err < 0) {
1671                 pr_err("Failed to add wakeup eventfd to poll list\n");
1672                 status = err;
1673                 goto out_delete_session;
1674         }
1675 #endif // HAVE_EVENTFD_SUPPORT
1676
1677         session->header.env.comp_type  = PERF_COMP_ZSTD;
1678         session->header.env.comp_level = rec->opts.comp_level;
1679
1680         if (rec->opts.kcore &&
1681             !record__kcore_readable(&session->machines.host)) {
1682                 pr_err("ERROR: kcore is not readable.\n");
1683                 return -1;
1684         }
1685
1686         if (record__init_clock(rec))
1687                 return -1;
1688
1689         record__init_features(rec);
1690
1691         if (forks) {
1692                 err = evlist__prepare_workload(rec->evlist, &opts->target, argv, data->is_pipe,
1693                                                workload_exec_failed_signal);
1694                 if (err < 0) {
1695                         pr_err("Couldn't run the workload!\n");
1696                         status = err;
1697                         goto out_delete_session;
1698                 }
1699         }
1700
1701         /*
1702          * If we have just single event and are sending data
1703          * through pipe, we need to force the ids allocation,
1704          * because we synthesize event name through the pipe
1705          * and need the id for that.
1706          */
1707         if (data->is_pipe && rec->evlist->core.nr_entries == 1)
1708                 rec->opts.sample_id = true;
1709
1710         if (record__open(rec) != 0) {
1711                 err = -1;
1712                 goto out_child;
1713         }
1714         session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
1715
1716         if (rec->opts.kcore) {
1717                 err = record__kcore_copy(&session->machines.host, data);
1718                 if (err) {
1719                         pr_err("ERROR: Failed to copy kcore\n");
1720                         goto out_child;
1721                 }
1722         }
1723
1724         err = bpf__apply_obj_config();
1725         if (err) {
1726                 char errbuf[BUFSIZ];
1727
1728                 bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
1729                 pr_err("ERROR: Apply config to BPF failed: %s\n",
1730                          errbuf);
1731                 goto out_child;
1732         }
1733
1734         /*
1735          * Normally perf_session__new would do this, but it doesn't have the
1736          * evlist.
1737          */
1738         if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) {
1739                 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
1740                 rec->tool.ordered_events = false;
1741         }
1742
1743         if (!rec->evlist->nr_groups)
1744                 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
1745
1746         if (data->is_pipe) {
1747                 err = perf_header__write_pipe(fd);
1748                 if (err < 0)
1749                         goto out_child;
1750         } else {
1751                 err = perf_session__write_header(session, rec->evlist, fd, false);
1752                 if (err < 0)
1753                         goto out_child;
1754         }
1755
1756         err = -1;
1757         if (!rec->no_buildid
1758             && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
1759                 pr_err("Couldn't generate buildids. "
1760                        "Use --no-buildid to profile anyway.\n");
1761                 goto out_child;
1762         }
1763
1764         err = record__setup_sb_evlist(rec);
1765         if (err)
1766                 goto out_child;
1767
1768         err = record__synthesize(rec, false);
1769         if (err < 0)
1770                 goto out_child;
1771
1772         if (rec->realtime_prio) {
1773                 struct sched_param param;
1774
1775                 param.sched_priority = rec->realtime_prio;
1776                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1777                         pr_err("Could not set realtime priority.\n");
1778                         err = -1;
1779                         goto out_child;
1780                 }
1781         }
1782
1783         /*
1784          * When perf is starting the traced process, all the events
1785          * (apart from group members) have enable_on_exec=1 set,
1786          * so don't spoil it by prematurely enabling them.
1787          */
1788         if (!target__none(&opts->target) && !opts->initial_delay)
1789                 evlist__enable(rec->evlist);
1790
1791         /*
1792          * Let the child rip
1793          */
1794         if (forks) {
1795                 struct machine *machine = &session->machines.host;
1796                 union perf_event *event;
1797                 pid_t tgid;
1798
1799                 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
1800                 if (event == NULL) {
1801                         err = -ENOMEM;
1802                         goto out_child;
1803                 }
1804
1805                 /*
1806                  * Some H/W events are generated before COMM event
1807                  * which is emitted during exec(), so perf script
1808                  * cannot see a correct process name for those events.
1809                  * Synthesize COMM event to prevent it.
1810                  */
1811                 tgid = perf_event__synthesize_comm(tool, event,
1812                                                    rec->evlist->workload.pid,
1813                                                    process_synthesized_event,
1814                                                    machine);
1815                 free(event);
1816
1817                 if (tgid == -1)
1818                         goto out_child;
1819
1820                 event = malloc(sizeof(event->namespaces) +
1821                                (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
1822                                machine->id_hdr_size);
1823                 if (event == NULL) {
1824                         err = -ENOMEM;
1825                         goto out_child;
1826                 }
1827
1828                 /*
1829                  * Synthesize NAMESPACES event for the command specified.
1830                  */
1831                 perf_event__synthesize_namespaces(tool, event,
1832                                                   rec->evlist->workload.pid,
1833                                                   tgid, process_synthesized_event,
1834                                                   machine);
1835                 free(event);
1836
1837                 evlist__start_workload(rec->evlist);
1838         }
1839
1840         if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack))
1841                 goto out_child;
1842
1843         if (opts->initial_delay) {
1844                 pr_info(EVLIST_DISABLED_MSG);
1845                 if (opts->initial_delay > 0) {
1846                         usleep(opts->initial_delay * USEC_PER_MSEC);
1847                         evlist__enable(rec->evlist);
1848                         pr_info(EVLIST_ENABLED_MSG);
1849                 }
1850         }
1851
1852         trigger_ready(&auxtrace_snapshot_trigger);
1853         trigger_ready(&switch_output_trigger);
1854         perf_hooks__invoke_record_start();
1855         for (;;) {
1856                 unsigned long long hits = rec->samples;
1857
1858                 /*
1859                  * rec->evlist->bkw_mmap_state is possible to be
1860                  * BKW_MMAP_EMPTY here: when done == true and
1861                  * hits != rec->samples in previous round.
1862                  *
1863                  * evlist__toggle_bkw_mmap ensure we never
1864                  * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
1865                  */
1866                 if (trigger_is_hit(&switch_output_trigger) || done || draining)
1867                         evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
1868
1869                 if (record__mmap_read_all(rec, false) < 0) {
1870                         trigger_error(&auxtrace_snapshot_trigger);
1871                         trigger_error(&switch_output_trigger);
1872                         err = -1;
1873                         goto out_child;
1874                 }
1875
1876                 if (auxtrace_record__snapshot_started) {
1877                         auxtrace_record__snapshot_started = 0;
1878                         if (!trigger_is_error(&auxtrace_snapshot_trigger))
1879                                 record__read_auxtrace_snapshot(rec, false);
1880                         if (trigger_is_error(&auxtrace_snapshot_trigger)) {
1881                                 pr_err("AUX area tracing snapshot failed\n");
1882                                 err = -1;
1883                                 goto out_child;
1884                         }
1885                 }
1886
1887                 if (trigger_is_hit(&switch_output_trigger)) {
1888                         /*
1889                          * If switch_output_trigger is hit, the data in
1890                          * overwritable ring buffer should have been collected,
1891                          * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
1892                          *
1893                          * If SIGUSR2 raise after or during record__mmap_read_all(),
1894                          * record__mmap_read_all() didn't collect data from
1895                          * overwritable ring buffer. Read again.
1896                          */
1897                         if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
1898                                 continue;
1899                         trigger_ready(&switch_output_trigger);
1900
1901                         /*
1902                          * Reenable events in overwrite ring buffer after
1903                          * record__mmap_read_all(): we should have collected
1904                          * data from it.
1905                          */
1906                         evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
1907
1908                         if (!quiet)
1909                                 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
1910                                         waking);
1911                         waking = 0;
1912                         fd = record__switch_output(rec, false);
1913                         if (fd < 0) {
1914                                 pr_err("Failed to switch to new file\n");
1915                                 trigger_error(&switch_output_trigger);
1916                                 err = fd;
1917                                 goto out_child;
1918                         }
1919
1920                         /* re-arm the alarm */
1921                         if (rec->switch_output.time)
1922                                 alarm(rec->switch_output.time);
1923                 }
1924
1925                 if (hits == rec->samples) {
1926                         if (done || draining)
1927                                 break;
1928                         err = evlist__poll(rec->evlist, -1);
1929                         /*
1930                          * Propagate error, only if there's any. Ignore positive
1931                          * number of returned events and interrupt error.
1932                          */
1933                         if (err > 0 || (err < 0 && errno == EINTR))
1934                                 err = 0;
1935                         waking++;
1936
1937                         if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
1938                                 draining = true;
1939                 }
1940
1941                 if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
1942                         switch (cmd) {
1943                         case EVLIST_CTL_CMD_SNAPSHOT:
1944                                 hit_auxtrace_snapshot_trigger(rec);
1945                                 evlist__ctlfd_ack(rec->evlist);
1946                                 break;
1947                         case EVLIST_CTL_CMD_STOP:
1948                                 done = 1;
1949                                 break;
1950                         case EVLIST_CTL_CMD_ACK:
1951                         case EVLIST_CTL_CMD_UNSUPPORTED:
1952                         case EVLIST_CTL_CMD_ENABLE:
1953                         case EVLIST_CTL_CMD_DISABLE:
1954                         case EVLIST_CTL_CMD_EVLIST:
1955                         case EVLIST_CTL_CMD_PING:
1956                         default:
1957                                 break;
1958                         }
1959                 }
1960
1961                 /*
1962                  * When perf is starting the traced process, at the end events
1963                  * die with the process and we wait for that. Thus no need to
1964                  * disable events in this case.
1965                  */
1966                 if (done && !disabled && !target__none(&opts->target)) {
1967                         trigger_off(&auxtrace_snapshot_trigger);
1968                         evlist__disable(rec->evlist);
1969                         disabled = true;
1970                 }
1971         }
1972
1973         trigger_off(&auxtrace_snapshot_trigger);
1974         trigger_off(&switch_output_trigger);
1975
1976         if (opts->auxtrace_snapshot_on_exit)
1977                 record__auxtrace_snapshot_exit(rec);
1978
1979         if (forks && workload_exec_errno) {
1980                 char msg[STRERR_BUFSIZE];
1981                 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
1982                 pr_err("Workload failed: %s\n", emsg);
1983                 err = -1;
1984                 goto out_child;
1985         }
1986
1987         if (!quiet)
1988                 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
1989
1990         if (target__none(&rec->opts.target))
1991                 record__synthesize_workload(rec, true);
1992
1993 out_child:
1994         evlist__finalize_ctlfd(rec->evlist);
1995         record__mmap_read_all(rec, true);
1996         record__aio_mmap_read_sync(rec);
1997
1998         if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
1999                 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
2000                 session->header.env.comp_ratio = ratio + 0.5;
2001         }
2002
2003         if (forks) {
2004                 int exit_status;
2005
2006                 if (!child_finished)
2007                         kill(rec->evlist->workload.pid, SIGTERM);
2008
2009                 wait(&exit_status);
2010
2011                 if (err < 0)
2012                         status = err;
2013                 else if (WIFEXITED(exit_status))
2014                         status = WEXITSTATUS(exit_status);
2015                 else if (WIFSIGNALED(exit_status))
2016                         signr = WTERMSIG(exit_status);
2017         } else
2018                 status = err;
2019
2020         record__synthesize(rec, true);
2021         /* this will be recalculated during process_buildids() */
2022         rec->samples = 0;
2023
2024         if (!err) {
2025                 if (!rec->timestamp_filename) {
2026                         record__finish_output(rec);
2027                 } else {
2028                         fd = record__switch_output(rec, true);
2029                         if (fd < 0) {
2030                                 status = fd;
2031                                 goto out_delete_session;
2032                         }
2033                 }
2034         }
2035
2036         perf_hooks__invoke_record_end();
2037
2038         if (!err && !quiet) {
2039                 char samples[128];
2040                 const char *postfix = rec->timestamp_filename ?
2041                                         ".<timestamp>" : "";
2042
2043                 if (rec->samples && !rec->opts.full_auxtrace)
2044                         scnprintf(samples, sizeof(samples),
2045                                   " (%" PRIu64 " samples)", rec->samples);
2046                 else
2047                         samples[0] = '\0';
2048
2049                 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s",
2050                         perf_data__size(data) / 1024.0 / 1024.0,
2051                         data->path, postfix, samples);
2052                 if (ratio) {
2053                         fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)",
2054                                         rec->session->bytes_transferred / 1024.0 / 1024.0,
2055                                         ratio);
2056                 }
2057                 fprintf(stderr, " ]\n");
2058         }
2059
2060 out_delete_session:
2061 #ifdef HAVE_EVENTFD_SUPPORT
2062         if (done_fd >= 0)
2063                 close(done_fd);
2064 #endif
2065         zstd_fini(&session->zstd_data);
2066         perf_session__delete(session);
2067
2068         if (!opts->no_bpf_event)
2069                 evlist__stop_sb_thread(rec->sb_evlist);
2070         return status;
2071 }
2072
2073 static void callchain_debug(struct callchain_param *callchain)
2074 {
2075         static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
2076
2077         pr_debug("callchain: type %s\n", str[callchain->record_mode]);
2078
2079         if (callchain->record_mode == CALLCHAIN_DWARF)
2080                 pr_debug("callchain: stack dump size %d\n",
2081                          callchain->dump_size);
2082 }
2083
2084 int record_opts__parse_callchain(struct record_opts *record,
2085                                  struct callchain_param *callchain,
2086                                  const char *arg, bool unset)
2087 {
2088         int ret;
2089         callchain->enabled = !unset;
2090
2091         /* --no-call-graph */
2092         if (unset) {
2093                 callchain->record_mode = CALLCHAIN_NONE;
2094                 pr_debug("callchain: disabled\n");
2095                 return 0;
2096         }
2097
2098         ret = parse_callchain_record_opt(arg, callchain);
2099         if (!ret) {
2100                 /* Enable data address sampling for DWARF unwind. */
2101                 if (callchain->record_mode == CALLCHAIN_DWARF)
2102                         record->sample_address = true;
2103                 callchain_debug(callchain);
2104         }
2105
2106         return ret;
2107 }
2108
2109 int record_parse_callchain_opt(const struct option *opt,
2110                                const char *arg,
2111                                int unset)
2112 {
2113         return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
2114 }
2115
2116 int record_callchain_opt(const struct option *opt,
2117                          const char *arg __maybe_unused,
2118                          int unset __maybe_unused)
2119 {
2120         struct callchain_param *callchain = opt->value;
2121
2122         callchain->enabled = true;
2123
2124         if (callchain->record_mode == CALLCHAIN_NONE)
2125                 callchain->record_mode = CALLCHAIN_FP;
2126
2127         callchain_debug(callchain);
2128         return 0;
2129 }
2130
2131 static int perf_record_config(const char *var, const char *value, void *cb)
2132 {
2133         struct record *rec = cb;
2134
2135         if (!strcmp(var, "record.build-id")) {
2136                 if (!strcmp(value, "cache"))
2137                         rec->no_buildid_cache = false;
2138                 else if (!strcmp(value, "no-cache"))
2139                         rec->no_buildid_cache = true;
2140                 else if (!strcmp(value, "skip"))
2141                         rec->no_buildid = true;
2142                 else if (!strcmp(value, "mmap"))
2143                         rec->buildid_mmap = true;
2144                 else
2145                         return -1;
2146                 return 0;
2147         }
2148         if (!strcmp(var, "record.call-graph")) {
2149                 var = "call-graph.record-mode";
2150                 return perf_default_config(var, value, cb);
2151         }
2152 #ifdef HAVE_AIO_SUPPORT
2153         if (!strcmp(var, "record.aio")) {
2154                 rec->opts.nr_cblocks = strtol(value, NULL, 0);
2155                 if (!rec->opts.nr_cblocks)
2156                         rec->opts.nr_cblocks = nr_cblocks_default;
2157         }
2158 #endif
2159
2160         return 0;
2161 }
2162
2163
2164 static int record__parse_affinity(const struct option *opt, const char *str, int unset)
2165 {
2166         struct record_opts *opts = (struct record_opts *)opt->value;
2167
2168         if (unset || !str)
2169                 return 0;
2170
2171         if (!strcasecmp(str, "node"))
2172                 opts->affinity = PERF_AFFINITY_NODE;
2173         else if (!strcasecmp(str, "cpu"))
2174                 opts->affinity = PERF_AFFINITY_CPU;
2175
2176         return 0;
2177 }
2178
2179 static int parse_output_max_size(const struct option *opt,
2180                                  const char *str, int unset)
2181 {
2182         unsigned long *s = (unsigned long *)opt->value;
2183         static struct parse_tag tags_size[] = {
2184                 { .tag  = 'B', .mult = 1       },
2185                 { .tag  = 'K', .mult = 1 << 10 },
2186                 { .tag  = 'M', .mult = 1 << 20 },
2187                 { .tag  = 'G', .mult = 1 << 30 },
2188                 { .tag  = 0 },
2189         };
2190         unsigned long val;
2191
2192         if (unset) {
2193                 *s = 0;
2194                 return 0;
2195         }
2196
2197         val = parse_tag_value(str, tags_size);
2198         if (val != (unsigned long) -1) {
2199                 *s = val;
2200                 return 0;
2201         }
2202
2203         return -1;
2204 }
2205
2206 static int record__parse_mmap_pages(const struct option *opt,
2207                                     const char *str,
2208                                     int unset __maybe_unused)
2209 {
2210         struct record_opts *opts = opt->value;
2211         char *s, *p;
2212         unsigned int mmap_pages;
2213         int ret;
2214
2215         if (!str)
2216                 return -EINVAL;
2217
2218         s = strdup(str);
2219         if (!s)
2220                 return -ENOMEM;
2221
2222         p = strchr(s, ',');
2223         if (p)
2224                 *p = '\0';
2225
2226         if (*s) {
2227                 ret = __evlist__parse_mmap_pages(&mmap_pages, s);
2228                 if (ret)
2229                         goto out_free;
2230                 opts->mmap_pages = mmap_pages;
2231         }
2232
2233         if (!p) {
2234                 ret = 0;
2235                 goto out_free;
2236         }
2237
2238         ret = __evlist__parse_mmap_pages(&mmap_pages, p + 1);
2239         if (ret)
2240                 goto out_free;
2241
2242         opts->auxtrace_mmap_pages = mmap_pages;
2243
2244 out_free:
2245         free(s);
2246         return ret;
2247 }
2248
2249 static int parse_control_option(const struct option *opt,
2250                                 const char *str,
2251                                 int unset __maybe_unused)
2252 {
2253         struct record_opts *opts = opt->value;
2254
2255         return evlist__parse_control(str, &opts->ctl_fd, &opts->ctl_fd_ack, &opts->ctl_fd_close);
2256 }
2257
2258 static void switch_output_size_warn(struct record *rec)
2259 {
2260         u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
2261         struct switch_output *s = &rec->switch_output;
2262
2263         wakeup_size /= 2;
2264
2265         if (s->size < wakeup_size) {
2266                 char buf[100];
2267
2268                 unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
2269                 pr_warning("WARNING: switch-output data size lower than "
2270                            "wakeup kernel buffer size (%s) "
2271                            "expect bigger perf.data sizes\n", buf);
2272         }
2273 }
2274
2275 static int switch_output_setup(struct record *rec)
2276 {
2277         struct switch_output *s = &rec->switch_output;
2278         static struct parse_tag tags_size[] = {
2279                 { .tag  = 'B', .mult = 1       },
2280                 { .tag  = 'K', .mult = 1 << 10 },
2281                 { .tag  = 'M', .mult = 1 << 20 },
2282                 { .tag  = 'G', .mult = 1 << 30 },
2283                 { .tag  = 0 },
2284         };
2285         static struct parse_tag tags_time[] = {
2286                 { .tag  = 's', .mult = 1        },
2287                 { .tag  = 'm', .mult = 60       },
2288                 { .tag  = 'h', .mult = 60*60    },
2289                 { .tag  = 'd', .mult = 60*60*24 },
2290                 { .tag  = 0 },
2291         };
2292         unsigned long val;
2293
2294         /*
2295          * If we're using --switch-output-events, then we imply its
2296          * --switch-output=signal, as we'll send a SIGUSR2 from the side band
2297          *  thread to its parent.
2298          */
2299         if (rec->switch_output_event_set)
2300                 goto do_signal;
2301
2302         if (!s->set)
2303                 return 0;
2304
2305         if (!strcmp(s->str, "signal")) {
2306 do_signal:
2307                 s->signal = true;
2308                 pr_debug("switch-output with SIGUSR2 signal\n");
2309                 goto enabled;
2310         }
2311
2312         val = parse_tag_value(s->str, tags_size);
2313         if (val != (unsigned long) -1) {
2314                 s->size = val;
2315                 pr_debug("switch-output with %s size threshold\n", s->str);
2316                 goto enabled;
2317         }
2318
2319         val = parse_tag_value(s->str, tags_time);
2320         if (val != (unsigned long) -1) {
2321                 s->time = val;
2322                 pr_debug("switch-output with %s time threshold (%lu seconds)\n",
2323                          s->str, s->time);
2324                 goto enabled;
2325         }
2326
2327         return -1;
2328
2329 enabled:
2330         rec->timestamp_filename = true;
2331         s->enabled              = true;
2332
2333         if (s->size && !rec->opts.no_buffering)
2334                 switch_output_size_warn(rec);
2335
2336         return 0;
2337 }
2338
2339 static const char * const __record_usage[] = {
2340         "perf record [<options>] [<command>]",
2341         "perf record [<options>] -- <command> [<options>]",
2342         NULL
2343 };
2344 const char * const *record_usage = __record_usage;
2345
2346 static int build_id__process_mmap(struct perf_tool *tool, union perf_event *event,
2347                                   struct perf_sample *sample, struct machine *machine)
2348 {
2349         /*
2350          * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
2351          * no need to add them twice.
2352          */
2353         if (!(event->header.misc & PERF_RECORD_MISC_USER))
2354                 return 0;
2355         return perf_event__process_mmap(tool, event, sample, machine);
2356 }
2357
2358 static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event,
2359                                    struct perf_sample *sample, struct machine *machine)
2360 {
2361         /*
2362          * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
2363          * no need to add them twice.
2364          */
2365         if (!(event->header.misc & PERF_RECORD_MISC_USER))
2366                 return 0;
2367
2368         return perf_event__process_mmap2(tool, event, sample, machine);
2369 }
2370
2371 /*
2372  * XXX Ideally would be local to cmd_record() and passed to a record__new
2373  * because we need to have access to it in record__exit, that is called
2374  * after cmd_record() exits, but since record_options need to be accessible to
2375  * builtin-script, leave it here.
2376  *
2377  * At least we don't ouch it in all the other functions here directly.
2378  *
2379  * Just say no to tons of global variables, sigh.
2380  */
2381 static struct record record = {
2382         .opts = {
2383                 .sample_time         = true,
2384                 .mmap_pages          = UINT_MAX,
2385                 .user_freq           = UINT_MAX,
2386                 .user_interval       = ULLONG_MAX,
2387                 .freq                = 4000,
2388                 .target              = {
2389                         .uses_mmap   = true,
2390                         .default_per_cpu = true,
2391                 },
2392                 .mmap_flush          = MMAP_FLUSH_DEFAULT,
2393                 .nr_threads_synthesize = 1,
2394                 .ctl_fd              = -1,
2395                 .ctl_fd_ack          = -1,
2396         },
2397         .tool = {
2398                 .sample         = process_sample_event,
2399                 .fork           = perf_event__process_fork,
2400                 .exit           = perf_event__process_exit,
2401                 .comm           = perf_event__process_comm,
2402                 .namespaces     = perf_event__process_namespaces,
2403                 .mmap           = build_id__process_mmap,
2404                 .mmap2          = build_id__process_mmap2,
2405                 .ordered_events = true,
2406         },
2407 };
2408
2409 const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
2410         "\n\t\t\t\tDefault: fp";
2411
2412 static bool dry_run;
2413
2414 /*
2415  * XXX Will stay a global variable till we fix builtin-script.c to stop messing
2416  * with it and switch to use the library functions in perf_evlist that came
2417  * from builtin-record.c, i.e. use record_opts,
2418  * evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
2419  * using pipes, etc.
2420  */
2421 static struct option __record_options[] = {
2422         OPT_CALLBACK('e', "event", &record.evlist, "event",
2423                      "event selector. use 'perf list' to list available events",
2424                      parse_events_option),
2425         OPT_CALLBACK(0, "filter", &record.evlist, "filter",
2426                      "event filter", parse_filter),
2427         OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
2428                            NULL, "don't record events from perf itself",
2429                            exclude_perf),
2430         OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
2431                     "record events on existing process id"),
2432         OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
2433                     "record events on existing thread id"),
2434         OPT_INTEGER('r', "realtime", &record.realtime_prio,
2435                     "collect data with this RT SCHED_FIFO priority"),
2436         OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
2437                     "collect data without buffering"),
2438         OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
2439                     "collect raw sample records from all opened counters"),
2440         OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
2441                             "system-wide collection from all CPUs"),
2442         OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
2443                     "list of cpus to monitor"),
2444         OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
2445         OPT_STRING('o', "output", &record.data.path, "file",
2446                     "output file name"),
2447         OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
2448                         &record.opts.no_inherit_set,
2449                         "child tasks do not inherit counters"),
2450         OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
2451                     "synthesize non-sample events at the end of output"),
2452         OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
2453         OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"),
2454         OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
2455                     "Fail if the specified frequency can't be used"),
2456         OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
2457                      "profile at this frequency",
2458                       record__parse_freq),
2459         OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
2460                      "number of mmap data pages and AUX area tracing mmap pages",
2461                      record__parse_mmap_pages),
2462         OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
2463                      "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
2464                      record__mmap_flush_parse),
2465         OPT_BOOLEAN(0, "group", &record.opts.group,
2466                     "put the counters into a counter group"),
2467         OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
2468                            NULL, "enables call-graph recording" ,
2469                            &record_callchain_opt),
2470         OPT_CALLBACK(0, "call-graph", &record.opts,
2471                      "record_mode[,record_size]", record_callchain_help,
2472                      &record_parse_callchain_opt),
2473         OPT_INCR('v', "verbose", &verbose,
2474                     "be more verbose (show counter open errors, etc)"),
2475         OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
2476         OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
2477                     "per thread counts"),
2478         OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
2479         OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
2480                     "Record the sample physical addresses"),
2481         OPT_BOOLEAN(0, "data-page-size", &record.opts.sample_data_page_size,
2482                     "Record the sampled data address data page size"),
2483         OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size,
2484                     "Record the sampled code address (ip) page size"),
2485         OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
2486         OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
2487                         &record.opts.sample_time_set,
2488                         "Record the sample timestamps"),
2489         OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
2490                         "Record the sample period"),
2491         OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
2492                     "don't sample"),
2493         OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
2494                         &record.no_buildid_cache_set,
2495                         "do not update the buildid cache"),
2496         OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
2497                         &record.no_buildid_set,
2498                         "do not collect buildids in perf.data"),
2499         OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
2500                      "monitor event in cgroup name only",
2501                      parse_cgroups),
2502         OPT_INTEGER('D', "delay", &record.opts.initial_delay,
2503                   "ms to wait before starting measurement after program start (-1: start with events disabled)"),
2504         OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"),
2505         OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
2506                    "user to profile"),
2507
2508         OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
2509                      "branch any", "sample any taken branches",
2510                      parse_branch_stack),
2511
2512         OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
2513                      "branch filter mask", "branch stack filter modes",
2514                      parse_branch_stack),
2515         OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
2516                     "sample by weight (on special events only)"),
2517         OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
2518                     "sample transaction flags (special events only)"),
2519         OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
2520                     "use per-thread mmaps"),
2521         OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
2522                     "sample selected machine registers on interrupt,"
2523                     " use '-I?' to list register names", parse_intr_regs),
2524         OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
2525                     "sample selected machine registers on interrupt,"
2526                     " use '--user-regs=?' to list register names", parse_user_regs),
2527         OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
2528                     "Record running/enabled time of read (:S) events"),
2529         OPT_CALLBACK('k', "clockid", &record.opts,
2530         "clockid", "clockid to use for events, see clock_gettime()",
2531         parse_clockid),
2532         OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
2533                           "opts", "AUX area tracing Snapshot Mode", ""),
2534         OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts,
2535                           "opts", "sample AUX area", ""),
2536         OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
2537                         "per thread proc mmap processing timeout in ms"),
2538         OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
2539                     "Record namespaces events"),
2540         OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
2541                     "Record cgroup events"),
2542         OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events,
2543                         &record.opts.record_switch_events_set,
2544                         "Record context switch events"),
2545         OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
2546                          "Configure all used events to run in kernel space.",
2547                          PARSE_OPT_EXCLUSIVE),
2548         OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
2549                          "Configure all used events to run in user space.",
2550                          PARSE_OPT_EXCLUSIVE),
2551         OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
2552                     "collect kernel callchains"),
2553         OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
2554                     "collect user callchains"),
2555         OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
2556                    "clang binary to use for compiling BPF scriptlets"),
2557         OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
2558                    "options passed to clang when compiling BPF scriptlets"),
2559         OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
2560                    "file", "vmlinux pathname"),
2561         OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
2562                     "Record build-id of all DSOs regardless of hits"),
2563         OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap,
2564                     "Record build-id in map events"),
2565         OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
2566                     "append timestamp to output filename"),
2567         OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
2568                     "Record timestamp boundary (time of first/last samples)"),
2569         OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
2570                           &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
2571                           "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
2572                           "signal"),
2573         OPT_CALLBACK_SET(0, "switch-output-event", &record.sb_evlist, &record.switch_output_event_set, "switch output event",
2574                          "switch output event selector. use 'perf list' to list available events",
2575                          parse_events_option_new_evlist),
2576         OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
2577                    "Limit number of switch output generated files"),
2578         OPT_BOOLEAN(0, "dry-run", &dry_run,
2579                     "Parse options then exit"),
2580 #ifdef HAVE_AIO_SUPPORT
2581         OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
2582                      &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
2583                      record__aio_parse),
2584 #endif
2585         OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
2586                      "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
2587                      record__parse_affinity),
2588 #ifdef HAVE_ZSTD_SUPPORT
2589         OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default,
2590                             "n", "Compressed records using specified level (default: 1 - fastest compression, 22 - greatest compression)",
2591                             record__parse_comp_level),
2592 #endif
2593         OPT_CALLBACK(0, "max-size", &record.output_max_size,
2594                      "size", "Limit the maximum size of the output file", parse_output_max_size),
2595         OPT_UINTEGER(0, "num-thread-synthesize",
2596                      &record.opts.nr_threads_synthesize,
2597                      "number of threads to run for event synthesis"),
2598 #ifdef HAVE_LIBPFM
2599         OPT_CALLBACK(0, "pfm-events", &record.evlist, "event",
2600                 "libpfm4 event selector. use 'perf list' to list available events",
2601                 parse_libpfm_events_option),
2602 #endif
2603         OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]",
2604                      "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events,\n"
2605                      "\t\t\t  'snapshot': AUX area tracing snapshot).\n"
2606                      "\t\t\t  Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n"
2607                      "\t\t\t  Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.",
2608                       parse_control_option),
2609         OPT_END()
2610 };
2611
2612 struct option *record_options = __record_options;
2613
2614 int cmd_record(int argc, const char **argv)
2615 {
2616         int err;
2617         struct record *rec = &record;
2618         char errbuf[BUFSIZ];
2619
2620         setlocale(LC_ALL, "");
2621
2622 #ifndef HAVE_LIBBPF_SUPPORT
2623 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c)
2624         set_nobuild('\0', "clang-path", true);
2625         set_nobuild('\0', "clang-opt", true);
2626 # undef set_nobuild
2627 #endif
2628
2629 #ifndef HAVE_BPF_PROLOGUE
2630 # if !defined (HAVE_DWARF_SUPPORT)
2631 #  define REASON  "NO_DWARF=1"
2632 # elif !defined (HAVE_LIBBPF_SUPPORT)
2633 #  define REASON  "NO_LIBBPF=1"
2634 # else
2635 #  define REASON  "this architecture doesn't support BPF prologue"
2636 # endif
2637 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
2638         set_nobuild('\0', "vmlinux", true);
2639 # undef set_nobuild
2640 # undef REASON
2641 #endif
2642
2643         rec->opts.affinity = PERF_AFFINITY_SYS;
2644
2645         rec->evlist = evlist__new();
2646         if (rec->evlist == NULL)
2647                 return -ENOMEM;
2648
2649         err = perf_config(perf_record_config, rec);
2650         if (err)
2651                 return err;
2652
2653         argc = parse_options(argc, argv, record_options, record_usage,
2654                             PARSE_OPT_STOP_AT_NON_OPTION);
2655         if (quiet)
2656                 perf_quiet_option();
2657
2658         /* Make system wide (-a) the default target. */
2659         if (!argc && target__none(&rec->opts.target))
2660                 rec->opts.target.system_wide = true;
2661
2662         if (nr_cgroups && !rec->opts.target.system_wide) {
2663                 usage_with_options_msg(record_usage, record_options,
2664                         "cgroup monitoring only available in system-wide mode");
2665
2666         }
2667
2668         if (rec->buildid_mmap) {
2669                 if (!perf_can_record_build_id()) {
2670                         pr_err("Failed: no support to record build id in mmap events, update your kernel.\n");
2671                         err = -EINVAL;
2672                         goto out_opts;
2673                 }
2674                 pr_debug("Enabling build id in mmap2 events.\n");
2675                 /* Enable mmap build id synthesizing. */
2676                 symbol_conf.buildid_mmap2 = true;
2677                 /* Enable perf_event_attr::build_id bit. */
2678                 rec->opts.build_id = true;
2679                 /* Disable build id cache. */
2680                 rec->no_buildid = true;
2681         }
2682
2683         if (rec->opts.kcore)
2684                 rec->data.is_dir = true;
2685
2686         if (rec->opts.comp_level != 0) {
2687                 pr_debug("Compression enabled, disabling build id collection at the end of the session.\n");
2688                 rec->no_buildid = true;
2689         }
2690
2691         if (rec->opts.record_switch_events &&
2692             !perf_can_record_switch_events()) {
2693                 ui__error("kernel does not support recording context switch events\n");
2694                 parse_options_usage(record_usage, record_options, "switch-events", 0);
2695                 err = -EINVAL;
2696                 goto out_opts;
2697         }
2698
2699         if (switch_output_setup(rec)) {
2700                 parse_options_usage(record_usage, record_options, "switch-output", 0);
2701                 err = -EINVAL;
2702                 goto out_opts;
2703         }
2704
2705         if (rec->switch_output.time) {
2706                 signal(SIGALRM, alarm_sig_handler);
2707                 alarm(rec->switch_output.time);
2708         }
2709
2710         if (rec->switch_output.num_files) {
2711                 rec->switch_output.filenames = calloc(sizeof(char *),
2712                                                       rec->switch_output.num_files);
2713                 if (!rec->switch_output.filenames) {
2714                         err = -EINVAL;
2715                         goto out_opts;
2716                 }
2717         }
2718
2719         /*
2720          * Allow aliases to facilitate the lookup of symbols for address
2721          * filters. Refer to auxtrace_parse_filters().
2722          */
2723         symbol_conf.allow_aliases = true;
2724
2725         symbol__init(NULL);
2726
2727         if (rec->opts.affinity != PERF_AFFINITY_SYS) {
2728                 rec->affinity_mask.nbits = cpu__max_cpu();
2729                 rec->affinity_mask.bits = bitmap_alloc(rec->affinity_mask.nbits);
2730                 if (!rec->affinity_mask.bits) {
2731                         pr_err("Failed to allocate thread mask for %zd cpus\n", rec->affinity_mask.nbits);
2732                         err = -ENOMEM;
2733                         goto out_opts;
2734                 }
2735                 pr_debug2("thread mask[%zd]: empty\n", rec->affinity_mask.nbits);
2736         }
2737
2738         err = record__auxtrace_init(rec);
2739         if (err)
2740                 goto out;
2741
2742         if (dry_run)
2743                 goto out;
2744
2745         err = bpf__setup_stdout(rec->evlist);
2746         if (err) {
2747                 bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf));
2748                 pr_err("ERROR: Setup BPF stdout failed: %s\n",
2749                          errbuf);
2750                 goto out;
2751         }
2752
2753         err = -ENOMEM;
2754
2755         if (rec->no_buildid_cache || rec->no_buildid) {
2756                 disable_buildid_cache();
2757         } else if (rec->switch_output.enabled) {
2758                 /*
2759                  * In 'perf record --switch-output', disable buildid
2760                  * generation by default to reduce data file switching
2761                  * overhead. Still generate buildid if they are required
2762                  * explicitly using
2763                  *
2764                  *  perf record --switch-output --no-no-buildid \
2765                  *              --no-no-buildid-cache
2766                  *
2767                  * Following code equals to:
2768                  *
2769                  * if ((rec->no_buildid || !rec->no_buildid_set) &&
2770                  *     (rec->no_buildid_cache || !rec->no_buildid_cache_set))
2771                  *         disable_buildid_cache();
2772                  */
2773                 bool disable = true;
2774
2775                 if (rec->no_buildid_set && !rec->no_buildid)
2776                         disable = false;
2777                 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
2778                         disable = false;
2779                 if (disable) {
2780                         rec->no_buildid = true;
2781                         rec->no_buildid_cache = true;
2782                         disable_buildid_cache();
2783                 }
2784         }
2785
2786         if (record.opts.overwrite)
2787                 record.opts.tail_synthesize = true;
2788
2789         if (rec->evlist->core.nr_entries == 0 &&
2790             __evlist__add_default(rec->evlist, !record.opts.no_samples) < 0) {
2791                 pr_err("Not enough memory for event selector list\n");
2792                 goto out;
2793         }
2794
2795         if (rec->opts.target.tid && !rec->opts.no_inherit_set)
2796                 rec->opts.no_inherit = true;
2797
2798         err = target__validate(&rec->opts.target);
2799         if (err) {
2800                 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2801                 ui__warning("%s\n", errbuf);
2802         }
2803
2804         err = target__parse_uid(&rec->opts.target);
2805         if (err) {
2806                 int saved_errno = errno;
2807
2808                 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2809                 ui__error("%s", errbuf);
2810
2811                 err = -saved_errno;
2812                 goto out;
2813         }
2814
2815         /* Enable ignoring missing threads when -u/-p option is defined. */
2816         rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
2817
2818         err = -ENOMEM;
2819         if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
2820                 usage_with_options(record_usage, record_options);
2821
2822         err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
2823         if (err)
2824                 goto out;
2825
2826         /*
2827          * We take all buildids when the file contains
2828          * AUX area tracing data because we do not decode the
2829          * trace because it would take too long.
2830          */
2831         if (rec->opts.full_auxtrace)
2832                 rec->buildid_all = true;
2833
2834         if (rec->opts.text_poke) {
2835                 err = record__config_text_poke(rec->evlist);
2836                 if (err) {
2837                         pr_err("record__config_text_poke failed, error %d\n", err);
2838                         goto out;
2839                 }
2840         }
2841
2842         if (record_opts__config(&rec->opts)) {
2843                 err = -EINVAL;
2844                 goto out;
2845         }
2846
2847         if (rec->opts.nr_cblocks > nr_cblocks_max)
2848                 rec->opts.nr_cblocks = nr_cblocks_max;
2849         pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
2850
2851         pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
2852         pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);
2853
2854         if (rec->opts.comp_level > comp_level_max)
2855                 rec->opts.comp_level = comp_level_max;
2856         pr_debug("comp level: %d\n", rec->opts.comp_level);
2857
2858         err = __cmd_record(&record, argc, argv);
2859 out:
2860         bitmap_free(rec->affinity_mask.bits);
2861         evlist__delete(rec->evlist);
2862         symbol__exit();
2863         auxtrace_record__free(rec->itr);
2864 out_opts:
2865         evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close);
2866         return err;
2867 }
2868
2869 static void snapshot_sig_handler(int sig __maybe_unused)
2870 {
2871         struct record *rec = &record;
2872
2873         hit_auxtrace_snapshot_trigger(rec);
2874
2875         if (switch_output_signal(rec))
2876                 trigger_hit(&switch_output_trigger);
2877 }
2878
2879 static void alarm_sig_handler(int sig __maybe_unused)
2880 {
2881         struct record *rec = &record;
2882
2883         if (switch_output_time(rec))
2884                 trigger_hit(&switch_output_trigger);
2885 }