tools/perf/builtin-record.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * builtin-record.c
   4  *
   5  * Builtin record command: Record the profile of a workload
   6  * (or a CPU, or a PID) into the perf.data output file - for
   7  * later analysis via perf report.
   8  */
   9 #include "builtin.h"
  10
  11 #include "util/build-id.h"
  12 #include <subcmd/parse-options.h>
  13 #include "util/parse-events.h"
  14 #include "util/config.h"
  15
  16 #include "util/callchain.h"
  17 #include "util/cgroup.h"
  18 #include "util/header.h"
  19 #include "util/event.h"
  20 #include "util/evlist.h"
  21 #include "util/evsel.h"
  22 #include "util/debug.h"
  23 #include "util/mmap.h"
  24 #include "util/target.h"
  25 #include "util/session.h"
  26 #include "util/tool.h"
  27 #include "util/symbol.h"
  28 #include "util/record.h"
  29 #include "util/cpumap.h"
  30 #include "util/thread_map.h"
  31 #include "util/data.h"
  32 #include "util/perf_regs.h"
  33 #include "util/auxtrace.h"
  34 #include "util/tsc.h"
  35 #include "util/parse-branch-options.h"
  36 #include "util/parse-regs-options.h"
  37 #include "util/perf_api_probe.h"
  38 #include "util/llvm-utils.h"
  39 #include "util/bpf-loader.h"
  40 #include "util/trigger.h"
  41 #include "util/perf-hooks.h"
  42 #include "util/cpu-set-sched.h"
  43 #include "util/synthetic-events.h"
  44 #include "util/time-utils.h"
  45 #include "util/units.h"
  46 #include "util/bpf-event.h"
  47 #include "util/util.h"
  48 #include "util/pfm.h"
  49 #include "util/clockid.h"
  50 #include "util/pmu-hybrid.h"
  51 #include "util/evlist-hybrid.h"
  52 #include "asm/bug.h"
  53 #include "perf.h"
  54
  55 #include <errno.h>
  56 #include <inttypes.h>
  57 #include <locale.h>
  58 #include <poll.h>
  59 #include <pthread.h>
  60 #include <unistd.h>
  61 #include <sched.h>
  62 #include <signal.h>
  63 #ifdef HAVE_EVENTFD_SUPPORT
  64 #include <sys/eventfd.h>
  65 #endif
  66 #include <sys/mman.h>
  67 #include <sys/wait.h>
  68 #include <sys/types.h>
  69 #include <sys/stat.h>
  70 #include <fcntl.h>
  71 #include <linux/err.h>
  72 #include <linux/string.h>
  73 #include <linux/time64.h>
  74 #include <linux/zalloc.h>
  75 #include <linux/bitmap.h>
  76 #include <sys/time.h>
  77
  78 struct switch_output {
  79         bool             enabled;
  80         bool             signal;
  81         unsigned long    size;
  82         unsigned long    time;
  83         const char      *str;
  84         bool             set;
  85         char             **filenames;
  86         int              num_files;
  87         int              cur_file;
  88 };
  89
  90 struct record {
  91         struct perf_tool        tool;
  92         struct record_opts      opts;
  93         u64                     bytes_written;
  94         struct perf_data        data;
  95         struct auxtrace_record  *itr;
  96         struct evlist   *evlist;
  97         struct perf_session     *session;
  98         struct evlist           *sb_evlist;
  99         pthread_t               thread_id;
 100         int                     realtime_prio;
 101         bool                    switch_output_event_set;
 102         bool                    no_buildid;
 103         bool                    no_buildid_set;
 104         bool                    no_buildid_cache;
 105         bool                    no_buildid_cache_set;
 106         bool                    buildid_all;
 107         bool                    buildid_mmap;
 108         bool                    timestamp_filename;
 109         bool                    timestamp_boundary;
 110         struct switch_output    switch_output;
 111         unsigned long long      samples;
 112         struct mmap_cpu_mask    affinity_mask;
 113         unsigned long           output_max_size;        /* = 0: unlimited */
 114 };
 115
 116 static volatile int done;
 117
 118 static volatile int auxtrace_record__snapshot_started;
 119 static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
 120 static DEFINE_TRIGGER(switch_output_trigger);
 121
 122 static const char *affinity_tags[PERF_AFFINITY_MAX] = {
 123         "SYS", "NODE", "CPU"
 124 };
 125
 126 static bool switch_output_signal(struct record *rec)
 127 {
 128         return rec->switch_output.signal &&
 129                trigger_is_ready(&switch_output_trigger);
 130 }
 131
 132 static bool switch_output_size(struct record *rec)
 133 {
 134         return rec->switch_output.size &&
 135                trigger_is_ready(&switch_output_trigger) &&
 136                (rec->bytes_written >= rec->switch_output.size);
 137 }
 138
 139 static bool switch_output_time(struct record *rec)
 140 {
 141         return rec->switch_output.time &&
 142                trigger_is_ready(&switch_output_trigger);
 143 }
 144
 145 static bool record__output_max_size_exceeded(struct record *rec)
 146 {
 147         return rec->output_max_size &&
 148                (rec->bytes_written >= rec->output_max_size);
 149 }
 150
 151 static int record__write(struct record *rec, struct mmap *map __maybe_unused,
 152                          void *bf, size_t size)
 153 {
 154         struct perf_data_file *file = &rec->session->data->file;
 155
 156         if (perf_data_file__write(file, bf, size) < 0) {
 157                 pr_err("failed to write perf data, error: %m\n");
 158                 return -1;
 159         }
 160
 161         rec->bytes_written += size;
 162
 163         if (record__output_max_size_exceeded(rec) && !done) {
 164                 fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB),"
 165                                 " stopping session ]\n",
 166                                 rec->bytes_written >> 10);
 167                 done = 1;
 168         }
 169
 170         if (switch_output_size(rec))
 171                 trigger_hit(&switch_output_trigger);
 172
 173         return 0;
 174 }
 175
 176 static int record__aio_enabled(struct record *rec);
 177 static int record__comp_enabled(struct record *rec);
 178 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
 179                             void *src, size_t src_size);
 180
 181 #ifdef HAVE_AIO_SUPPORT
 182 static int record__aio_write(struct aiocb *cblock, int trace_fd,
 183                 void *buf, size_t size, off_t off)
 184 {
 185         int rc;
 186
 187         cblock->aio_fildes = trace_fd;
 188         cblock->aio_buf    = buf;
 189         cblock->aio_nbytes = size;
 190         cblock->aio_offset = off;
 191         cblock->aio_sigevent.sigev_notify = SIGEV_NONE;
 192
 193         do {
 194                 rc = aio_write(cblock);
 195                 if (rc == 0) {
 196                         break;
 197                 } else if (errno != EAGAIN) {
 198                         cblock->aio_fildes = -1;
 199                         pr_err("failed to queue perf data, error: %m\n");
 200                         break;
 201                 }
 202         } while (1);
 203
 204         return rc;
 205 }
 206
 207 static int record__aio_complete(struct mmap *md, struct aiocb *cblock)
 208 {
 209         void *rem_buf;
 210         off_t rem_off;
 211         size_t rem_size;
 212         int rc, aio_errno;
 213         ssize_t aio_ret, written;
 214
 215         aio_errno = aio_error(cblock);
 216         if (aio_errno == EINPROGRESS)
 217                 return 0;
 218
 219         written = aio_ret = aio_return(cblock);
 220         if (aio_ret < 0) {
 221                 if (aio_errno != EINTR)
 222                         pr_err("failed to write perf data, error: %m\n");
 223                 written = 0;
 224         }
 225
 226         rem_size = cblock->aio_nbytes - written;
 227
 228         if (rem_size == 0) {
 229                 cblock->aio_fildes = -1;
 230                 /*
 231                  * md->refcount is incremented in record__aio_pushfn() for
 232                  * every aio write request started in record__aio_push() so
 233                  * decrement it because the request is now complete.
 234                  */
 235                 perf_mmap__put(&md->core);
 236                 rc = 1;
 237         } else {
 238                 /*
 239                  * aio write request may require restart with the
 240                  * reminder if the kernel didn't write whole
 241                  * chunk at once.
 242                  */
 243                 rem_off = cblock->aio_offset + written;
 244                 rem_buf = (void *)(cblock->aio_buf + written);
 245                 record__aio_write(cblock, cblock->aio_fildes,
 246                                 rem_buf, rem_size, rem_off);
 247                 rc = 0;
 248         }
 249
 250         return rc;
 251 }
 252
 253 static int record__aio_sync(struct mmap *md, bool sync_all)
 254 {
 255         struct aiocb **aiocb = md->aio.aiocb;
 256         struct aiocb *cblocks = md->aio.cblocks;
 257         struct timespec timeout = { 0, 1000 * 1000  * 1 }; /* 1ms */
 258         int i, do_suspend;
 259
 260         do {
 261                 do_suspend = 0;
 262                 for (i = 0; i < md->aio.nr_cblocks; ++i) {
 263                         if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) {
 264                                 if (sync_all)
 265                                         aiocb[i] = NULL;
 266                                 else
 267                                         return i;
 268                         } else {
 269                                 /*
 270                                  * Started aio write is not complete yet
 271                                  * so it has to be waited before the
 272                                  * next allocation.
 273                                  */
 274                                 aiocb[i] = &cblocks[i];
 275                                 do_suspend = 1;
 276                         }
 277                 }
 278                 if (!do_suspend)
 279                         return -1;
 280
 281                 while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) {
 282                         if (!(errno == EAGAIN || errno == EINTR))
 283                                 pr_err("failed to sync perf data, error: %m\n");
 284                 }
 285         } while (1);
 286 }
 287
 288 struct record_aio {
 289         struct record   *rec;
 290         void            *data;
 291         size_t          size;
 292 };
 293
 294 static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size)
 295 {
 296         struct record_aio *aio = to;
 297
 298         /*
 299          * map->core.base data pointed by buf is copied into free map->aio.data[] buffer
 300          * to release space in the kernel buffer as fast as possible, calling
 301          * perf_mmap__consume() from perf_mmap__push() function.
 302          *
 303          * That lets the kernel to proceed with storing more profiling data into
 304          * the kernel buffer earlier than other per-cpu kernel buffers are handled.
 305          *
 306          * Coping can be done in two steps in case the chunk of profiling data
 307          * crosses the upper bound of the kernel buffer. In this case we first move
 308          * part of data from map->start till the upper bound and then the reminder
 309          * from the beginning of the kernel buffer till the end of the data chunk.
 310          */
 311
 312         if (record__comp_enabled(aio->rec)) {
 313                 size = zstd_compress(aio->rec->session, aio->data + aio->size,
 314                                      mmap__mmap_len(map) - aio->size,
 315                                      buf, size);
 316         } else {
 317                 memcpy(aio->data + aio->size, buf, size);
 318         }
 319
 320         if (!aio->size) {
 321                 /*
 322                  * Increment map->refcount to guard map->aio.data[] buffer
 323                  * from premature deallocation because map object can be
 324                  * released earlier than aio write request started on
 325                  * map->aio.data[] buffer is complete.
 326                  *
 327                  * perf_mmap__put() is done at record__aio_complete()
 328                  * after started aio request completion or at record__aio_push()
 329                  * if the request failed to start.
 330                  */
 331                 perf_mmap__get(&map->core);
 332         }
 333
 334         aio->size += size;
 335
 336         return size;
 337 }
 338
 339 static int record__aio_push(struct record *rec, struct mmap *map, off_t *off)
 340 {
 341         int ret, idx;
 342         int trace_fd = rec->session->data->file.fd;
 343         struct record_aio aio = { .rec = rec, .size = 0 };
 344
 345         /*
 346          * Call record__aio_sync() to wait till map->aio.data[] buffer
 347          * becomes available after previous aio write operation.
 348          */
 349
 350         idx = record__aio_sync(map, false);
 351         aio.data = map->aio.data[idx];
 352         ret = perf_mmap__push(map, &aio, record__aio_pushfn);
 353         if (ret != 0) /* ret > 0 - no data, ret < 0 - error */
 354                 return ret;
 355
 356         rec->samples++;
 357         ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off);
 358         if (!ret) {
 359                 *off += aio.size;
 360                 rec->bytes_written += aio.size;
 361                 if (switch_output_size(rec))
 362                         trigger_hit(&switch_output_trigger);
 363         } else {
 364                 /*
 365                  * Decrement map->refcount incremented in record__aio_pushfn()
 366                  * back if record__aio_write() operation failed to start, otherwise
 367                  * map->refcount is decremented in record__aio_complete() after
 368                  * aio write operation finishes successfully.
 369                  */
 370                 perf_mmap__put(&map->core);
 371         }
 372
 373         return ret;
 374 }
 375
 376 static off_t record__aio_get_pos(int trace_fd)
 377 {
 378         return lseek(trace_fd, 0, SEEK_CUR);
 379 }
 380
 381 static void record__aio_set_pos(int trace_fd, off_t pos)
 382 {
 383         lseek(trace_fd, pos, SEEK_SET);
 384 }
 385
 386 static void record__aio_mmap_read_sync(struct record *rec)
 387 {
 388         int i;
 389         struct evlist *evlist = rec->evlist;
 390         struct mmap *maps = evlist->mmap;
 391
 392         if (!record__aio_enabled(rec))
 393                 return;
 394
 395         for (i = 0; i < evlist->core.nr_mmaps; i++) {
 396                 struct mmap *map = &maps[i];
 397
 398                 if (map->core.base)
 399                         record__aio_sync(map, true);
 400         }
 401 }
 402
 403 static int nr_cblocks_default = 1;
 404 static int nr_cblocks_max = 4;
 405
 406 static int record__aio_parse(const struct option *opt,
 407                              const char *str,
 408                              int unset)
 409 {
 410         struct record_opts *opts = (struct record_opts *)opt->value;
 411
 412         if (unset) {
 413                 opts->nr_cblocks = 0;
 414         } else {
 415                 if (str)
 416                         opts->nr_cblocks = strtol(str, NULL, 0);
 417                 if (!opts->nr_cblocks)
 418                         opts->nr_cblocks = nr_cblocks_default;
 419         }
 420
 421         return 0;
 422 }
 423 #else /* HAVE_AIO_SUPPORT */
 424 static int nr_cblocks_max = 0;
 425
 426 static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused,
 427                             off_t *off __maybe_unused)
 428 {
 429         return -1;
 430 }
 431
 432 static off_t record__aio_get_pos(int trace_fd __maybe_unused)
 433 {
 434         return -1;
 435 }
 436
 437 static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused)
 438 {
 439 }
 440
 441 static void record__aio_mmap_read_sync(struct record *rec __maybe_unused)
 442 {
 443 }
 444 #endif
 445
 446 static int record__aio_enabled(struct record *rec)
 447 {
 448         return rec->opts.nr_cblocks > 0;
 449 }
 450
 451 #define MMAP_FLUSH_DEFAULT 1
 452 static int record__mmap_flush_parse(const struct option *opt,
 453                                     const char *str,
 454                                     int unset)
 455 {
 456         int flush_max;
 457         struct record_opts *opts = (struct record_opts *)opt->value;
 458         static struct parse_tag tags[] = {
 459                         { .tag  = 'B', .mult = 1       },
 460                         { .tag  = 'K', .mult = 1 << 10 },
 461                         { .tag  = 'M', .mult = 1 << 20 },
 462                         { .tag  = 'G', .mult = 1 << 30 },
 463                         { .tag  = 0 },
 464         };
 465
 466         if (unset)
 467                 return 0;
 468
 469         if (str) {
 470                 opts->mmap_flush = parse_tag_value(str, tags);
 471                 if (opts->mmap_flush == (int)-1)
 472                         opts->mmap_flush = strtol(str, NULL, 0);
 473         }
 474
 475         if (!opts->mmap_flush)
 476                 opts->mmap_flush = MMAP_FLUSH_DEFAULT;
 477
 478         flush_max = evlist__mmap_size(opts->mmap_pages);
 479         flush_max /= 4;
 480         if (opts->mmap_flush > flush_max)
 481                 opts->mmap_flush = flush_max;
 482
 483         return 0;
 484 }
 485
 486 #ifdef HAVE_ZSTD_SUPPORT
 487 static unsigned int comp_level_default = 1;
 488
 489 static int record__parse_comp_level(const struct option *opt, const char *str, int unset)
 490 {
 491         struct record_opts *opts = opt->value;
 492
 493         if (unset) {
 494                 opts->comp_level = 0;
 495         } else {
 496                 if (str)
 497                         opts->comp_level = strtol(str, NULL, 0);
 498                 if (!opts->comp_level)
 499                         opts->comp_level = comp_level_default;
 500         }
 501
 502         return 0;
 503 }
 504 #endif
 505 static unsigned int comp_level_max = 22;
 506
 507 static int record__comp_enabled(struct record *rec)
 508 {
 509         return rec->opts.comp_level > 0;
 510 }
 511
 512 static int process_synthesized_event(struct perf_tool *tool,
 513                                      union perf_event *event,
 514                                      struct perf_sample *sample __maybe_unused,
 515                                      struct machine *machine __maybe_unused)
 516 {
 517         struct record *rec = container_of(tool, struct record, tool);
 518         return record__write(rec, NULL, event, event->header.size);
 519 }
 520
 521 static int process_locked_synthesized_event(struct perf_tool *tool,
 522                                      union perf_event *event,
 523                                      struct perf_sample *sample __maybe_unused,
 524                                      struct machine *machine __maybe_unused)
 525 {
 526         static pthread_mutex_t synth_lock = PTHREAD_MUTEX_INITIALIZER;
 527         int ret;
 528
 529         pthread_mutex_lock(&synth_lock);
 530         ret = process_synthesized_event(tool, event, sample, machine);
 531         pthread_mutex_unlock(&synth_lock);
 532         return ret;
 533 }
 534
 535 static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
 536 {
 537         struct record *rec = to;
 538
 539         if (record__comp_enabled(rec)) {
 540                 size = zstd_compress(rec->session, map->data, mmap__mmap_len(map), bf, size);
 541                 bf   = map->data;
 542         }
 543
 544         rec->samples++;
 545         return record__write(rec, map, bf, size);
 546 }
 547
 548 static volatile int signr = -1;
 549 static volatile int child_finished;
 550 #ifdef HAVE_EVENTFD_SUPPORT
 551 static int done_fd = -1;
 552 #endif
 553
 554 static void sig_handler(int sig)
 555 {
 556         if (sig == SIGCHLD)
 557                 child_finished = 1;
 558         else
 559                 signr = sig;
 560
 561         done = 1;
 562 #ifdef HAVE_EVENTFD_SUPPORT
 563 {
 564         u64 tmp = 1;
 565         /*
 566          * It is possible for this signal handler to run after done is checked
 567          * in the main loop, but before the perf counter fds are polled. If this
 568          * happens, the poll() will continue to wait even though done is set,
 569          * and will only break out if either another signal is received, or the
 570          * counters are ready for read. To ensure the poll() doesn't sleep when
 571          * done is set, use an eventfd (done_fd) to wake up the poll().
 572          */
 573         if (write(done_fd, &tmp, sizeof(tmp)) < 0)
 574                 pr_err("failed to signal wakeup fd, error: %m\n");
 575 }
 576 #endif // HAVE_EVENTFD_SUPPORT
 577 }
 578
 579 static void sigsegv_handler(int sig)
 580 {
 581         perf_hooks__recover();
 582         sighandler_dump_stack(sig);
 583 }
 584
 585 static void record__sig_exit(void)
 586 {
 587         if (signr == -1)
 588                 return;
 589
 590         signal(signr, SIG_DFL);
 591         raise(signr);
 592 }
 593
 594 #ifdef HAVE_AUXTRACE_SUPPORT
 595
 596 static int record__process_auxtrace(struct perf_tool *tool,
 597                                     struct mmap *map,
 598                                     union perf_event *event, void *data1,
 599                                     size_t len1, void *data2, size_t len2)
 600 {
 601         struct record *rec = container_of(tool, struct record, tool);
 602         struct perf_data *data = &rec->data;
 603         size_t padding;
 604         u8 pad[8] = {0};
 605
 606         if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) {
 607                 off_t file_offset;
 608                 int fd = perf_data__fd(data);
 609                 int err;
 610
 611                 file_offset = lseek(fd, 0, SEEK_CUR);
 612                 if (file_offset == -1)
 613                         return -1;
 614                 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
 615                                                      event, file_offset);
 616                 if (err)
 617                         return err;
 618         }
 619
 620         /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
 621         padding = (len1 + len2) & 7;
 622         if (padding)
 623                 padding = 8 - padding;
 624
 625         record__write(rec, map, event, event->header.size);
 626         record__write(rec, map, data1, len1);
 627         if (len2)
 628                 record__write(rec, map, data2, len2);
 629         record__write(rec, map, &pad, padding);
 630
 631         return 0;
 632 }
 633
 634 static int record__auxtrace_mmap_read(struct record *rec,
 635                                       struct mmap *map)
 636 {
 637         int ret;
 638
 639         ret = auxtrace_mmap__read(map, rec->itr, &rec->tool,
 640                                   record__process_auxtrace);
 641         if (ret < 0)
 642                 return ret;
 643
 644         if (ret)
 645                 rec->samples++;
 646
 647         return 0;
 648 }
 649
 650 static int record__auxtrace_mmap_read_snapshot(struct record *rec,
 651                                                struct mmap *map)
 652 {
 653         int ret;
 654
 655         ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool,
 656                                            record__process_auxtrace,
 657                                            rec->opts.auxtrace_snapshot_size);
 658         if (ret < 0)
 659                 return ret;
 660
 661         if (ret)
 662                 rec->samples++;
 663
 664         return 0;
 665 }
 666
 667 static int record__auxtrace_read_snapshot_all(struct record *rec)
 668 {
 669         int i;
 670         int rc = 0;
 671
 672         for (i = 0; i < rec->evlist->core.nr_mmaps; i++) {
 673                 struct mmap *map = &rec->evlist->mmap[i];
 674
 675                 if (!map->auxtrace_mmap.base)
 676                         continue;
 677
 678                 if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) {
 679                         rc = -1;
 680                         goto out;
 681                 }
 682         }
 683 out:
 684         return rc;
 685 }
 686
 687 static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit)
 688 {
 689         pr_debug("Recording AUX area tracing snapshot\n");
 690         if (record__auxtrace_read_snapshot_all(rec) < 0) {
 691                 trigger_error(&auxtrace_snapshot_trigger);
 692         } else {
 693                 if (auxtrace_record__snapshot_finish(rec->itr, on_exit))
 694                         trigger_error(&auxtrace_snapshot_trigger);
 695                 else
 696                         trigger_ready(&auxtrace_snapshot_trigger);
 697         }
 698 }
 699
 700 static int record__auxtrace_snapshot_exit(struct record *rec)
 701 {
 702         if (trigger_is_error(&auxtrace_snapshot_trigger))
 703                 return 0;
 704
 705         if (!auxtrace_record__snapshot_started &&
 706             auxtrace_record__snapshot_start(rec->itr))
 707                 return -1;
 708
 709         record__read_auxtrace_snapshot(rec, true);
 710         if (trigger_is_error(&auxtrace_snapshot_trigger))
 711                 return -1;
 712
 713         return 0;
 714 }
 715
 716 static int record__auxtrace_init(struct record *rec)
 717 {
 718         int err;
 719
 720         if (!rec->itr) {
 721                 rec->itr = auxtrace_record__init(rec->evlist, &err);
 722                 if (err)
 723                         return err;
 724         }
 725
 726         err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
 727                                               rec->opts.auxtrace_snapshot_opts);
 728         if (err)
 729                 return err;
 730
 731         err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts,
 732                                             rec->opts.auxtrace_sample_opts);
 733         if (err)
 734                 return err;
 735
 736         auxtrace_regroup_aux_output(rec->evlist);
 737
 738         return auxtrace_parse_filters(rec->evlist);
 739 }
 740
 741 #else
 742
 743 static inline
 744 int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
 745                                struct mmap *map __maybe_unused)
 746 {
 747         return 0;
 748 }
 749
 750 static inline
 751 void record__read_auxtrace_snapshot(struct record *rec __maybe_unused,
 752                                     bool on_exit __maybe_unused)
 753 {
 754 }
 755
 756 static inline
 757 int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
 758 {
 759         return 0;
 760 }
 761
 762 static inline
 763 int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused)
 764 {
 765         return 0;
 766 }
 767
 768 static int record__auxtrace_init(struct record *rec __maybe_unused)
 769 {
 770         return 0;
 771 }
 772
 773 #endif
 774
 775 static int record__config_text_poke(struct evlist *evlist)
 776 {
 777         struct evsel *evsel;
 778         int err;
 779
 780         /* Nothing to do if text poke is already configured */
 781         evlist__for_each_entry(evlist, evsel) {
 782                 if (evsel->core.attr.text_poke)
 783                         return 0;
 784         }
 785
 786         err = parse_events(evlist, "dummy:u", NULL);
 787         if (err)
 788                 return err;
 789
 790         evsel = evlist__last(evlist);
 791
 792         evsel->core.attr.freq = 0;
 793         evsel->core.attr.sample_period = 1;
 794         evsel->core.attr.text_poke = 1;
 795         evsel->core.attr.ksymbol = 1;
 796
 797         evsel->core.system_wide = true;
 798         evsel->no_aux_samples = true;
 799         evsel->immediate = true;
 800
 801         /* Text poke must be collected on all CPUs */
 802         perf_cpu_map__put(evsel->core.own_cpus);
 803         evsel->core.own_cpus = perf_cpu_map__new(NULL);
 804         perf_cpu_map__put(evsel->core.cpus);
 805         evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus);
 806
 807         evsel__set_sample_bit(evsel, TIME);
 808
 809         return 0;
 810 }
 811
 812 static bool record__kcore_readable(struct machine *machine)
 813 {
 814         char kcore[PATH_MAX];
 815         int fd;
 816
 817         scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir);
 818
 819         fd = open(kcore, O_RDONLY);
 820         if (fd < 0)
 821                 return false;
 822
 823         close(fd);
 824
 825         return true;
 826 }
 827
 828 static int record__kcore_copy(struct machine *machine, struct perf_data *data)
 829 {
 830         char from_dir[PATH_MAX];
 831         char kcore_dir[PATH_MAX];
 832         int ret;
 833
 834         snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir);
 835
 836         ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir));
 837         if (ret)
 838                 return ret;
 839
 840         return kcore_copy(from_dir, kcore_dir);
 841 }
 842
 843 static int record__mmap_evlist(struct record *rec,
 844                                struct evlist *evlist)
 845 {
 846         struct record_opts *opts = &rec->opts;
 847         bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
 848                                   opts->auxtrace_sample_mode;
 849         char msg[512];
 850
 851         if (opts->affinity != PERF_AFFINITY_SYS)
 852                 cpu__setup_cpunode_map();
 853
 854         if (evlist__mmap_ex(evlist, opts->mmap_pages,
 855                                  opts->auxtrace_mmap_pages,
 856                                  auxtrace_overwrite,
 857                                  opts->nr_cblocks, opts->affinity,
 858                                  opts->mmap_flush, opts->comp_level) < 0) {
 859                 if (errno == EPERM) {
 860                         pr_err("Permission error mapping pages.\n"
 861                                "Consider increasing "
 862                                "/proc/sys/kernel/perf_event_mlock_kb,\n"
 863                                "or try again with a smaller value of -m/--mmap_pages.\n"
 864                                "(current value: %u,%u)\n",
 865                                opts->mmap_pages, opts->auxtrace_mmap_pages);
 866                         return -errno;
 867                 } else {
 868                         pr_err("failed to mmap with %d (%s)\n", errno,
 869                                 str_error_r(errno, msg, sizeof(msg)));
 870                         if (errno)
 871                                 return -errno;
 872                         else
 873                                 return -EINVAL;
 874                 }
 875         }
 876         return 0;
 877 }
 878
 879 static int record__mmap(struct record *rec)
 880 {
 881         return record__mmap_evlist(rec, rec->evlist);
 882 }
 883
 884 static int record__open(struct record *rec)
 885 {
 886         char msg[BUFSIZ];
 887         struct evsel *pos;
 888         struct evlist *evlist = rec->evlist;
 889         struct perf_session *session = rec->session;
 890         struct record_opts *opts = &rec->opts;
 891         int rc = 0;
 892
 893         /*
 894          * For initial_delay, system wide or a hybrid system, we need to add a
 895          * dummy event so that we can track PERF_RECORD_MMAP to cover the delay
 896          * of waiting or event synthesis.
 897          */
 898         if (opts->initial_delay || target__has_cpu(&opts->target) ||
 899             perf_pmu__has_hybrid()) {
 900                 pos = evlist__get_tracking_event(evlist);
 901                 if (!evsel__is_dummy_event(pos)) {
 902                         /* Set up dummy event. */
 903                         if (evlist__add_dummy(evlist))
 904                                 return -ENOMEM;
 905                         pos = evlist__last(evlist);
 906                         evlist__set_tracking_event(evlist, pos);
 907                 }
 908
 909                 /*
 910                  * Enable the dummy event when the process is forked for
 911                  * initial_delay, immediately for system wide.
 912                  */
 913                 if (opts->initial_delay && !pos->immediate &&
 914                     !target__has_cpu(&opts->target))
 915                         pos->core.attr.enable_on_exec = 1;
 916                 else
 917                         pos->immediate = 1;
 918         }
 919
 920         evlist__config(evlist, opts, &callchain_param);
 921
 922         evlist__for_each_entry(evlist, pos) {
 923 try_again:
 924                 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) {
 925                         if (evsel__fallback(pos, errno, msg, sizeof(msg))) {
 926                                 if (verbose > 0)
 927                                         ui__warning("%s\n", msg);
 928                                 goto try_again;
 929                         }
 930                         if ((errno == EINVAL || errno == EBADF) &&
 931                             pos->core.leader != &pos->core &&
 932                             pos->weak_group) {
 933                                 pos = evlist__reset_weak_group(evlist, pos, true);
 934                                 goto try_again;
 935                         }
 936                         rc = -errno;
 937                         evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg));
 938                         ui__error("%s\n", msg);
 939                         goto out;
 940                 }
 941
 942                 pos->supported = true;
 943         }
 944
 945         if (symbol_conf.kptr_restrict && !evlist__exclude_kernel(evlist)) {
 946                 pr_warning(
 947 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
 948 "check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
 949 "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
 950 "file is not found in the buildid cache or in the vmlinux path.\n\n"
 951 "Samples in kernel modules won't be resolved at all.\n\n"
 952 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
 953 "even with a suitable vmlinux or kallsyms file.\n\n");
 954         }
 955
 956         if (evlist__apply_filters(evlist, &pos)) {
 957                 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
 958                         pos->filter, evsel__name(pos), errno,
 959                         str_error_r(errno, msg, sizeof(msg)));
 960                 rc = -1;
 961                 goto out;
 962         }
 963
 964         rc = record__mmap(rec);
 965         if (rc)
 966                 goto out;
 967
 968         session->evlist = evlist;
 969         perf_session__set_id_hdr_size(session);
 970 out:
 971         return rc;
 972 }
 973
 974 static void set_timestamp_boundary(struct record *rec, u64 sample_time)
 975 {
 976         if (rec->evlist->first_sample_time == 0)
 977                 rec->evlist->first_sample_time = sample_time;
 978
 979         if (sample_time)
 980                 rec->evlist->last_sample_time = sample_time;
 981 }
 982
 983 static int process_sample_event(struct perf_tool *tool,
 984                                 union perf_event *event,
 985                                 struct perf_sample *sample,
 986                                 struct evsel *evsel,
 987                                 struct machine *machine)
 988 {
 989         struct record *rec = container_of(tool, struct record, tool);
 990
 991         set_timestamp_boundary(rec, sample->time);
 992
 993         if (rec->buildid_all)
 994                 return 0;
 995
 996         rec->samples++;
 997         return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
 998 }
 999
1000 static int process_buildids(struct record *rec)
1001 {
1002         struct perf_session *session = rec->session;
1003
1004         if (perf_data__size(&rec->data) == 0)
1005                 return 0;
1006
1007         /*
1008          * During this process, it'll load kernel map and replace the
1009          * dso->long_name to a real pathname it found.  In this case
1010          * we prefer the vmlinux path like
1011          *   /lib/modules/3.16.4/build/vmlinux
1012          *
1013          * rather than build-id path (in debug directory).
1014          *   $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
1015          */
1016         symbol_conf.ignore_vmlinux_buildid = true;
1017
1018         /*
1019          * If --buildid-all is given, it marks all DSO regardless of hits,
1020          * so no need to process samples. But if timestamp_boundary is enabled,
1021          * it still needs to walk on all samples to get the timestamps of
1022          * first/last samples.
1023          */
1024         if (rec->buildid_all && !rec->timestamp_boundary)
1025                 rec->tool.sample = NULL;
1026
1027         return perf_session__process_events(session);
1028 }
1029
1030 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
1031 {
1032         int err;
1033         struct perf_tool *tool = data;
1034         /*
1035          *As for guest kernel when processing subcommand record&report,
1036          *we arrange module mmap prior to guest kernel mmap and trigger
1037          *a preload dso because default guest module symbols are loaded
1038          *from guest kallsyms instead of /lib/modules/XXX/XXX. This
1039          *method is used to avoid symbol missing when the first addr is
1040          *in module instead of in guest kernel.
1041          */
1042         err = perf_event__synthesize_modules(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          * We use _stext for guest kernel because guest kernel's /proc/kallsyms
1050          * have no _text sometimes.
1051          */
1052         err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1053                                                  machine);
1054         if (err < 0)
1055                 pr_err("Couldn't record guest kernel [%d]'s reference"
1056                        " relocation symbol.\n", machine->pid);
1057 }
1058
1059 static struct perf_event_header finished_round_event = {
1060         .size = sizeof(struct perf_event_header),
1061         .type = PERF_RECORD_FINISHED_ROUND,
1062 };
1063
1064 static void record__adjust_affinity(struct record *rec, struct mmap *map)
1065 {
1066         if (rec->opts.affinity != PERF_AFFINITY_SYS &&
1067             !bitmap_equal(rec->affinity_mask.bits, map->affinity_mask.bits,
1068                           rec->affinity_mask.nbits)) {
1069                 bitmap_zero(rec->affinity_mask.bits, rec->affinity_mask.nbits);
1070                 bitmap_or(rec->affinity_mask.bits, rec->affinity_mask.bits,
1071                           map->affinity_mask.bits, rec->affinity_mask.nbits);
1072                 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&rec->affinity_mask),
1073                                   (cpu_set_t *)rec->affinity_mask.bits);
1074                 if (verbose == 2)
1075                         mmap_cpu_mask__scnprintf(&rec->affinity_mask, "thread");
1076         }
1077 }
1078
1079 static size_t process_comp_header(void *record, size_t increment)
1080 {
1081         struct perf_record_compressed *event = record;
1082         size_t size = sizeof(*event);
1083
1084         if (increment) {
1085                 event->header.size += increment;
1086                 return increment;
1087         }
1088
1089         event->header.type = PERF_RECORD_COMPRESSED;
1090         event->header.size = size;
1091
1092         return size;
1093 }
1094
1095 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
1096                             void *src, size_t src_size)
1097 {
1098         size_t compressed;
1099         size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
1100
1101         compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size,
1102                                                      max_record_size, process_comp_header);
1103
1104         session->bytes_transferred += src_size;
1105         session->bytes_compressed  += compressed;
1106
1107         return compressed;
1108 }
1109
1110 static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
1111                                     bool overwrite, bool synch)
1112 {
1113         u64 bytes_written = rec->bytes_written;
1114         int i;
1115         int rc = 0;
1116         struct mmap *maps;
1117         int trace_fd = rec->data.file.fd;
1118         off_t off = 0;
1119
1120         if (!evlist)
1121                 return 0;
1122
1123         maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
1124         if (!maps)
1125                 return 0;
1126
1127         if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
1128                 return 0;
1129
1130         if (record__aio_enabled(rec))
1131                 off = record__aio_get_pos(trace_fd);
1132
1133         for (i = 0; i < evlist->core.nr_mmaps; i++) {
1134                 u64 flush = 0;
1135                 struct mmap *map = &maps[i];
1136
1137                 if (map->core.base) {
1138                         record__adjust_affinity(rec, map);
1139                         if (synch) {
1140                                 flush = map->core.flush;
1141                                 map->core.flush = 1;
1142                         }
1143                         if (!record__aio_enabled(rec)) {
1144                                 if (perf_mmap__push(map, rec, record__pushfn) < 0) {
1145                                         if (synch)
1146                                                 map->core.flush = flush;
1147                                         rc = -1;
1148                                         goto out;
1149                                 }
1150                         } else {
1151                                 if (record__aio_push(rec, map, &off) < 0) {
1152                                         record__aio_set_pos(trace_fd, off);
1153                                         if (synch)
1154                                                 map->core.flush = flush;
1155                                         rc = -1;
1156                                         goto out;
1157                                 }
1158                         }
1159                         if (synch)
1160                                 map->core.flush = flush;
1161                 }
1162
1163                 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
1164                     !rec->opts.auxtrace_sample_mode &&
1165                     record__auxtrace_mmap_read(rec, map) != 0) {
1166                         rc = -1;
1167                         goto out;
1168                 }
1169         }
1170
1171         if (record__aio_enabled(rec))
1172                 record__aio_set_pos(trace_fd, off);
1173
1174         /*
1175          * Mark the round finished in case we wrote
1176          * at least one event.
1177          */
1178         if (bytes_written != rec->bytes_written)
1179                 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));
1180
1181         if (overwrite)
1182                 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
1183 out:
1184         return rc;
1185 }
1186
1187 static int record__mmap_read_all(struct record *rec, bool synch)
1188 {
1189         int err;
1190
1191         err = record__mmap_read_evlist(rec, rec->evlist, false, synch);
1192         if (err)
1193                 return err;
1194
1195         return record__mmap_read_evlist(rec, rec->evlist, true, synch);
1196 }
1197
1198 static void record__init_features(struct record *rec)
1199 {
1200         struct perf_session *session = rec->session;
1201         int feat;
1202
1203         for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1204                 perf_header__set_feat(&session->header, feat);
1205
1206         if (rec->no_buildid)
1207                 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1208
1209         if (!have_tracepoints(&rec->evlist->core.entries))
1210                 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1211
1212         if (!rec->opts.branch_stack)
1213                 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1214
1215         if (!rec->opts.full_auxtrace)
1216                 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1217
1218         if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
1219                 perf_header__clear_feat(&session->header, HEADER_CLOCKID);
1220
1221         if (!rec->opts.use_clockid)
1222                 perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);
1223
1224         perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1225         if (!record__comp_enabled(rec))
1226                 perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
1227
1228         perf_header__clear_feat(&session->header, HEADER_STAT);
1229 }
1230
1231 static void
1232 record__finish_output(struct record *rec)
1233 {
1234         struct perf_data *data = &rec->data;
1235         int fd = perf_data__fd(data);
1236
1237         if (data->is_pipe)
1238                 return;
1239
1240         rec->session->header.data_size += rec->bytes_written;
1241         data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
1242
1243         if (!rec->no_buildid) {
1244                 process_buildids(rec);
1245
1246                 if (rec->buildid_all)
1247                         dsos__hit_all(rec->session);
1248         }
1249         perf_session__write_header(rec->session, rec->evlist, fd, true);
1250
1251         return;
1252 }
1253
1254 static int record__synthesize_workload(struct record *rec, bool tail)
1255 {
1256         int err;
1257         struct perf_thread_map *thread_map;
1258
1259         if (rec->opts.tail_synthesize != tail)
1260                 return 0;
1261
1262         thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
1263         if (thread_map == NULL)
1264                 return -1;
1265
1266         err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
1267                                                  process_synthesized_event,
1268                                                  &rec->session->machines.host,
1269                                                  rec->opts.sample_address);
1270         perf_thread_map__put(thread_map);
1271         return err;
1272 }
1273
1274 static int record__synthesize(struct record *rec, bool tail);
1275
1276 static int
1277 record__switch_output(struct record *rec, bool at_exit)
1278 {
1279         struct perf_data *data = &rec->data;
1280         int fd, err;
1281         char *new_filename;
1282
1283         /* Same Size:      "2015122520103046"*/
1284         char timestamp[] = "InvalidTimestamp";
1285
1286         record__aio_mmap_read_sync(rec);
1287
1288         record__synthesize(rec, true);
1289         if (target__none(&rec->opts.target))
1290                 record__synthesize_workload(rec, true);
1291
1292         rec->samples = 0;
1293         record__finish_output(rec);
1294         err = fetch_current_timestamp(timestamp, sizeof(timestamp));
1295         if (err) {
1296                 pr_err("Failed to get current timestamp\n");
1297                 return -EINVAL;
1298         }
1299
1300         fd = perf_data__switch(data, timestamp,
1301                                     rec->session->header.data_offset,
1302                                     at_exit, &new_filename);
1303         if (fd >= 0 && !at_exit) {
1304                 rec->bytes_written = 0;
1305                 rec->session->header.data_size = 0;
1306         }
1307
1308         if (!quiet)
1309                 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
1310                         data->path, timestamp);
1311
1312         if (rec->switch_output.num_files) {
1313                 int n = rec->switch_output.cur_file + 1;
1314
1315                 if (n >= rec->switch_output.num_files)
1316                         n = 0;
1317                 rec->switch_output.cur_file = n;
1318                 if (rec->switch_output.filenames[n]) {
1319                         remove(rec->switch_output.filenames[n]);
1320                         zfree(&rec->switch_output.filenames[n]);
1321                 }
1322                 rec->switch_output.filenames[n] = new_filename;
1323         } else {
1324                 free(new_filename);
1325         }
1326
1327         /* Output tracking events */
1328         if (!at_exit) {
1329                 record__synthesize(rec, false);
1330
1331                 /*
1332                  * In 'perf record --switch-output' without -a,
1333                  * record__synthesize() in record__switch_output() won't
1334                  * generate tracking events because there's no thread_map
1335                  * in evlist. Which causes newly created perf.data doesn't
1336                  * contain map and comm information.
1337                  * Create a fake thread_map and directly call
1338                  * perf_event__synthesize_thread_map() for those events.
1339                  */
1340                 if (target__none(&rec->opts.target))
1341                         record__synthesize_workload(rec, false);
1342         }
1343         return fd;
1344 }
1345
1346 static volatile int workload_exec_errno;
1347
1348 /*
1349  * evlist__prepare_workload will send a SIGUSR1
1350  * if the fork fails, since we asked by setting its
1351  * want_signal to true.
1352  */
1353 static void workload_exec_failed_signal(int signo __maybe_unused,
1354                                         siginfo_t *info,
1355                                         void *ucontext __maybe_unused)
1356 {
1357         workload_exec_errno = info->si_value.sival_int;
1358         done = 1;
1359         child_finished = 1;
1360 }
1361
1362 static void snapshot_sig_handler(int sig);
1363 static void alarm_sig_handler(int sig);
1364
1365 static const struct perf_event_mmap_page *evlist__pick_pc(struct evlist *evlist)
1366 {
1367         if (evlist) {
1368                 if (evlist->mmap && evlist->mmap[0].core.base)
1369                         return evlist->mmap[0].core.base;
1370                 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base)
1371                         return evlist->overwrite_mmap[0].core.base;
1372         }
1373         return NULL;
1374 }
1375
1376 static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
1377 {
1378         const struct perf_event_mmap_page *pc = evlist__pick_pc(rec->evlist);
1379         if (pc)
1380                 return pc;
1381         return NULL;
1382 }
1383
1384 static int record__synthesize(struct record *rec, bool tail)
1385 {
1386         struct perf_session *session = rec->session;
1387         struct machine *machine = &session->machines.host;
1388         struct perf_data *data = &rec->data;
1389         struct record_opts *opts = &rec->opts;
1390         struct perf_tool *tool = &rec->tool;
1391         int err = 0;
1392         event_op f = process_synthesized_event;
1393
1394         if (rec->opts.tail_synthesize != tail)
1395                 return 0;
1396
1397         if (data->is_pipe) {
1398                 err = perf_event__synthesize_for_pipe(tool, session, data,
1399                                                       process_synthesized_event);
1400                 if (err < 0)
1401                         goto out;
1402
1403                 rec->bytes_written += err;
1404         }
1405
1406         err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
1407                                           process_synthesized_event, machine);
1408         if (err)
1409                 goto out;
1410
1411         /* Synthesize id_index before auxtrace_info */
1412         if (rec->opts.auxtrace_sample_mode) {
1413                 err = perf_event__synthesize_id_index(tool,
1414                                                       process_synthesized_event,
1415                                                       session->evlist, machine);
1416                 if (err)
1417                         goto out;
1418         }
1419
1420         if (rec->opts.full_auxtrace) {
1421                 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
1422                                         session, process_synthesized_event);
1423                 if (err)
1424                         goto out;
1425         }
1426
1427         if (!evlist__exclude_kernel(rec->evlist)) {
1428                 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1429                                                          machine);
1430                 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
1431                                    "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1432                                    "Check /proc/kallsyms permission or run as root.\n");
1433
1434                 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1435                                                      machine);
1436                 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
1437                                    "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1438                                    "Check /proc/modules permission or run as root.\n");
1439         }
1440
1441         if (perf_guest) {
1442                 machines__process_guests(&session->machines,
1443                                          perf_event__synthesize_guest_os, tool);
1444         }
1445
1446         err = perf_event__synthesize_extra_attr(&rec->tool,
1447                                                 rec->evlist,
1448                                                 process_synthesized_event,
1449                                                 data->is_pipe);
1450         if (err)
1451                 goto out;
1452
1453         err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads,
1454                                                  process_synthesized_event,
1455                                                 NULL);
1456         if (err < 0) {
1457                 pr_err("Couldn't synthesize thread map.\n");
1458                 return err;
1459         }
1460
1461         err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.cpus,
1462                                              process_synthesized_event, NULL);
1463         if (err < 0) {
1464                 pr_err("Couldn't synthesize cpu map.\n");
1465                 return err;
1466         }
1467
1468         err = perf_event__synthesize_bpf_events(session, process_synthesized_event,
1469                                                 machine, opts);
1470         if (err < 0)
1471                 pr_warning("Couldn't synthesize bpf events.\n");
1472
1473         err = perf_event__synthesize_cgroups(tool, process_synthesized_event,
1474                                              machine);
1475         if (err < 0)
1476                 pr_warning("Couldn't synthesize cgroup events.\n");
1477
1478         if (rec->opts.nr_threads_synthesize > 1) {
1479                 perf_set_multithreaded();
1480                 f = process_locked_synthesized_event;
1481         }
1482
1483         err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->core.threads,
1484                                             f, opts->sample_address,
1485                                             rec->opts.nr_threads_synthesize);
1486
1487         if (rec->opts.nr_threads_synthesize > 1)
1488                 perf_set_singlethreaded();
1489
1490 out:
1491         return err;
1492 }
1493
1494 static int record__process_signal_event(union perf_event *event __maybe_unused, void *data)
1495 {
1496         struct record *rec = data;
1497         pthread_kill(rec->thread_id, SIGUSR2);
1498         return 0;
1499 }
1500
1501 static int record__setup_sb_evlist(struct record *rec)
1502 {
1503         struct record_opts *opts = &rec->opts;
1504
1505         if (rec->sb_evlist != NULL) {
1506                 /*
1507                  * We get here if --switch-output-event populated the
1508                  * sb_evlist, so associate a callback that will send a SIGUSR2
1509                  * to the main thread.
1510                  */
1511                 evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec);
1512                 rec->thread_id = pthread_self();
1513         }
1514 #ifdef HAVE_LIBBPF_SUPPORT
1515         if (!opts->no_bpf_event) {
1516                 if (rec->sb_evlist == NULL) {
1517                         rec->sb_evlist = evlist__new();
1518
1519                         if (rec->sb_evlist == NULL) {
1520                                 pr_err("Couldn't create side band evlist.\n.");
1521                                 return -1;
1522                         }
1523                 }
1524
1525                 if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) {
1526                         pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
1527                         return -1;
1528                 }
1529         }
1530 #endif
1531         if (evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) {
1532                 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1533                 opts->no_bpf_event = true;
1534         }
1535
1536         return 0;
1537 }
1538
1539 static int record__init_clock(struct record *rec)
1540 {
1541         struct perf_session *session = rec->session;
1542         struct timespec ref_clockid;
1543         struct timeval ref_tod;
1544         u64 ref;
1545
1546         if (!rec->opts.use_clockid)
1547                 return 0;
1548
1549         if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
1550                 session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns;
1551
1552         session->header.env.clock.clockid = rec->opts.clockid;
1553
1554         if (gettimeofday(&ref_tod, NULL) != 0) {
1555                 pr_err("gettimeofday failed, cannot set reference time.\n");
1556                 return -1;
1557         }
1558
1559         if (clock_gettime(rec->opts.clockid, &ref_clockid)) {
1560                 pr_err("clock_gettime failed, cannot set reference time.\n");
1561                 return -1;
1562         }
1563
1564         ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC +
1565               (u64) ref_tod.tv_usec * NSEC_PER_USEC;
1566
1567         session->header.env.clock.tod_ns = ref;
1568
1569         ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC +
1570               (u64) ref_clockid.tv_nsec;
1571
1572         session->header.env.clock.clockid_ns = ref;
1573         return 0;
1574 }
1575
1576 static void hit_auxtrace_snapshot_trigger(struct record *rec)
1577 {
1578         if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
1579                 trigger_hit(&auxtrace_snapshot_trigger);
1580                 auxtrace_record__snapshot_started = 1;
1581                 if (auxtrace_record__snapshot_start(rec->itr))
1582                         trigger_error(&auxtrace_snapshot_trigger);
1583         }
1584 }
1585
1586 static void record__uniquify_name(struct record *rec)
1587 {
1588         struct evsel *pos;
1589         struct evlist *evlist = rec->evlist;
1590         char *new_name;
1591         int ret;
1592
1593         if (!perf_pmu__has_hybrid())
1594                 return;
1595
1596         evlist__for_each_entry(evlist, pos) {
1597                 if (!evsel__is_hybrid(pos))
1598                         continue;
1599
1600                 if (strchr(pos->name, '/'))
1601                         continue;
1602
1603                 ret = asprintf(&new_name, "%s/%s/",
1604                                pos->pmu_name, pos->name);
1605                 if (ret) {
1606                         free(pos->name);
1607                         pos->name = new_name;
1608                 }
1609         }
1610 }
1611
1612 static int __cmd_record(struct record *rec, int argc, const char **argv)
1613 {
1614         int err;
1615         int status = 0;
1616         unsigned long waking = 0;
1617         const bool forks = argc > 0;
1618         struct perf_tool *tool = &rec->tool;
1619         struct record_opts *opts = &rec->opts;
1620         struct perf_data *data = &rec->data;
1621         struct perf_session *session;
1622         bool disabled = false, draining = false;
1623         int fd;
1624         float ratio = 0;
1625         enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
1626
1627         atexit(record__sig_exit);
1628         signal(SIGCHLD, sig_handler);
1629         signal(SIGINT, sig_handler);
1630         signal(SIGTERM, sig_handler);
1631         signal(SIGSEGV, sigsegv_handler);
1632
1633         if (rec->opts.record_namespaces)
1634                 tool->namespace_events = true;
1635
1636         if (rec->opts.record_cgroup) {
1637 #ifdef HAVE_FILE_HANDLE
1638                 tool->cgroup_events = true;
1639 #else
1640                 pr_err("cgroup tracking is not supported\n");
1641                 return -1;
1642 #endif
1643         }
1644
1645         if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
1646                 signal(SIGUSR2, snapshot_sig_handler);
1647                 if (rec->opts.auxtrace_snapshot_mode)
1648                         trigger_on(&auxtrace_snapshot_trigger);
1649                 if (rec->switch_output.enabled)
1650                         trigger_on(&switch_output_trigger);
1651         } else {
1652                 signal(SIGUSR2, SIG_IGN);
1653         }
1654
1655         session = perf_session__new(data, tool);
1656         if (IS_ERR(session)) {
1657                 pr_err("Perf session creation failed.\n");
1658                 return PTR_ERR(session);
1659         }
1660
1661         fd = perf_data__fd(data);
1662         rec->session = session;
1663
1664         if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
1665                 pr_err("Compression initialization failed.\n");
1666                 return -1;
1667         }
1668 #ifdef HAVE_EVENTFD_SUPPORT
1669         done_fd = eventfd(0, EFD_NONBLOCK);
1670         if (done_fd < 0) {
1671                 pr_err("Failed to create wakeup eventfd, error: %m\n");
1672                 status = -1;
1673                 goto out_delete_session;
1674         }
1675         err = evlist__add_wakeup_eventfd(rec->evlist, done_fd);
1676         if (err < 0) {
1677                 pr_err("Failed to add wakeup eventfd to poll list\n");
1678                 status = err;
1679                 goto out_delete_session;
1680         }
1681 #endif // HAVE_EVENTFD_SUPPORT
1682
1683         session->header.env.comp_type  = PERF_COMP_ZSTD;
1684         session->header.env.comp_level = rec->opts.comp_level;
1685
1686         if (rec->opts.kcore &&
1687             !record__kcore_readable(&session->machines.host)) {
1688                 pr_err("ERROR: kcore is not readable.\n");
1689                 return -1;
1690         }
1691
1692         if (record__init_clock(rec))
1693                 return -1;
1694
1695         record__init_features(rec);
1696
1697         if (forks) {
1698                 err = evlist__prepare_workload(rec->evlist, &opts->target, argv, data->is_pipe,
1699                                                workload_exec_failed_signal);
1700                 if (err < 0) {
1701                         pr_err("Couldn't run the workload!\n");
1702                         status = err;
1703                         goto out_delete_session;
1704                 }
1705         }
1706
1707         /*
1708          * If we have just single event and are sending data
1709          * through pipe, we need to force the ids allocation,
1710          * because we synthesize event name through the pipe
1711          * and need the id for that.
1712          */
1713         if (data->is_pipe && rec->evlist->core.nr_entries == 1)
1714                 rec->opts.sample_id = true;
1715
1716         record__uniquify_name(rec);
1717
1718         if (record__open(rec) != 0) {
1719                 err = -1;
1720                 goto out_child;
1721         }
1722         session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
1723
1724         if (rec->opts.kcore) {
1725                 err = record__kcore_copy(&session->machines.host, data);
1726                 if (err) {
1727                         pr_err("ERROR: Failed to copy kcore\n");
1728                         goto out_child;
1729                 }
1730         }
1731
1732         err = bpf__apply_obj_config();
1733         if (err) {
1734                 char errbuf[BUFSIZ];
1735
1736                 bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
1737                 pr_err("ERROR: Apply config to BPF failed: %s\n",
1738                          errbuf);
1739                 goto out_child;
1740         }
1741
1742         /*
1743          * Normally perf_session__new would do this, but it doesn't have the
1744          * evlist.
1745          */
1746         if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) {
1747                 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
1748                 rec->tool.ordered_events = false;
1749         }
1750
1751         if (!rec->evlist->core.nr_groups)
1752                 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
1753
1754         if (data->is_pipe) {
1755                 err = perf_header__write_pipe(fd);
1756                 if (err < 0)
1757                         goto out_child;
1758         } else {
1759                 err = perf_session__write_header(session, rec->evlist, fd, false);
1760                 if (err < 0)
1761                         goto out_child;
1762         }
1763
1764         err = -1;
1765         if (!rec->no_buildid
1766             && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
1767                 pr_err("Couldn't generate buildids. "
1768                        "Use --no-buildid to profile anyway.\n");
1769                 goto out_child;
1770         }
1771
1772         err = record__setup_sb_evlist(rec);
1773         if (err)
1774                 goto out_child;
1775
1776         err = record__synthesize(rec, false);
1777         if (err < 0)
1778                 goto out_child;
1779
1780         if (rec->realtime_prio) {
1781                 struct sched_param param;
1782
1783                 param.sched_priority = rec->realtime_prio;
1784                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1785                         pr_err("Could not set realtime priority.\n");
1786                         err = -1;
1787                         goto out_child;
1788                 }
1789         }
1790
1791         /*
1792          * When perf is starting the traced process, all the events
1793          * (apart from group members) have enable_on_exec=1 set,
1794          * so don't spoil it by prematurely enabling them.
1795          */
1796         if (!target__none(&opts->target) && !opts->initial_delay)
1797                 evlist__enable(rec->evlist);
1798
1799         /*
1800          * Let the child rip
1801          */
1802         if (forks) {
1803                 struct machine *machine = &session->machines.host;
1804                 union perf_event *event;
1805                 pid_t tgid;
1806
1807                 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
1808                 if (event == NULL) {
1809                         err = -ENOMEM;
1810                         goto out_child;
1811                 }
1812
1813                 /*
1814                  * Some H/W events are generated before COMM event
1815                  * which is emitted during exec(), so perf script
1816                  * cannot see a correct process name for those events.
1817                  * Synthesize COMM event to prevent it.
1818                  */
1819                 tgid = perf_event__synthesize_comm(tool, event,
1820                                                    rec->evlist->workload.pid,
1821                                                    process_synthesized_event,
1822                                                    machine);
1823                 free(event);
1824
1825                 if (tgid == -1)
1826                         goto out_child;
1827
1828                 event = malloc(sizeof(event->namespaces) +
1829                                (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
1830                                machine->id_hdr_size);
1831                 if (event == NULL) {
1832                         err = -ENOMEM;
1833                         goto out_child;
1834                 }
1835
1836                 /*
1837                  * Synthesize NAMESPACES event for the command specified.
1838                  */
1839                 perf_event__synthesize_namespaces(tool, event,
1840                                                   rec->evlist->workload.pid,
1841                                                   tgid, process_synthesized_event,
1842                                                   machine);
1843                 free(event);
1844
1845                 evlist__start_workload(rec->evlist);
1846         }
1847
1848         if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack))
1849                 goto out_child;
1850
1851         if (opts->initial_delay) {
1852                 pr_info(EVLIST_DISABLED_MSG);
1853                 if (opts->initial_delay > 0) {
1854                         usleep(opts->initial_delay * USEC_PER_MSEC);
1855                         evlist__enable(rec->evlist);
1856                         pr_info(EVLIST_ENABLED_MSG);
1857                 }
1858         }
1859
1860         trigger_ready(&auxtrace_snapshot_trigger);
1861         trigger_ready(&switch_output_trigger);
1862         perf_hooks__invoke_record_start();
1863         for (;;) {
1864                 unsigned long long hits = rec->samples;
1865
1866                 /*
1867                  * rec->evlist->bkw_mmap_state is possible to be
1868                  * BKW_MMAP_EMPTY here: when done == true and
1869                  * hits != rec->samples in previous round.
1870                  *
1871                  * evlist__toggle_bkw_mmap ensure we never
1872                  * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
1873                  */
1874                 if (trigger_is_hit(&switch_output_trigger) || done || draining)
1875                         evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
1876
1877                 if (record__mmap_read_all(rec, false) < 0) {
1878                         trigger_error(&auxtrace_snapshot_trigger);
1879                         trigger_error(&switch_output_trigger);
1880                         err = -1;
1881                         goto out_child;
1882                 }
1883
1884                 if (auxtrace_record__snapshot_started) {
1885                         auxtrace_record__snapshot_started = 0;
1886                         if (!trigger_is_error(&auxtrace_snapshot_trigger))
1887                                 record__read_auxtrace_snapshot(rec, false);
1888                         if (trigger_is_error(&auxtrace_snapshot_trigger)) {
1889                                 pr_err("AUX area tracing snapshot failed\n");
1890                                 err = -1;
1891                                 goto out_child;
1892                         }
1893                 }
1894
1895                 if (trigger_is_hit(&switch_output_trigger)) {
1896                         /*
1897                          * If switch_output_trigger is hit, the data in
1898                          * overwritable ring buffer should have been collected,
1899                          * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
1900                          *
1901                          * If SIGUSR2 raise after or during record__mmap_read_all(),
1902                          * record__mmap_read_all() didn't collect data from
1903                          * overwritable ring buffer. Read again.
1904                          */
1905                         if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
1906                                 continue;
1907                         trigger_ready(&switch_output_trigger);
1908
1909                         /*
1910                          * Reenable events in overwrite ring buffer after
1911                          * record__mmap_read_all(): we should have collected
1912                          * data from it.
1913                          */
1914                         evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
1915
1916                         if (!quiet)
1917                                 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
1918                                         waking);
1919                         waking = 0;
1920                         fd = record__switch_output(rec, false);
1921                         if (fd < 0) {
1922                                 pr_err("Failed to switch to new file\n");
1923                                 trigger_error(&switch_output_trigger);
1924                                 err = fd;
1925                                 goto out_child;
1926                         }
1927
1928                         /* re-arm the alarm */
1929                         if (rec->switch_output.time)
1930                                 alarm(rec->switch_output.time);
1931                 }
1932
1933                 if (hits == rec->samples) {
1934                         if (done || draining)
1935                                 break;
1936                         err = evlist__poll(rec->evlist, -1);
1937                         /*
1938                          * Propagate error, only if there's any. Ignore positive
1939                          * number of returned events and interrupt error.
1940                          */
1941                         if (err > 0 || (err < 0 && errno == EINTR))
1942                                 err = 0;
1943                         waking++;
1944
1945                         if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
1946                                 draining = true;
1947                 }
1948
1949                 if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
1950                         switch (cmd) {
1951                         case EVLIST_CTL_CMD_SNAPSHOT:
1952                                 hit_auxtrace_snapshot_trigger(rec);
1953                                 evlist__ctlfd_ack(rec->evlist);
1954                                 break;
1955                         case EVLIST_CTL_CMD_STOP:
1956                                 done = 1;
1957                                 break;
1958                         case EVLIST_CTL_CMD_ACK:
1959                         case EVLIST_CTL_CMD_UNSUPPORTED:
1960                         case EVLIST_CTL_CMD_ENABLE:
1961                         case EVLIST_CTL_CMD_DISABLE:
1962                         case EVLIST_CTL_CMD_EVLIST:
1963                         case EVLIST_CTL_CMD_PING:
1964                         default:
1965                                 break;
1966                         }
1967                 }
1968
1969                 /*
1970                  * When perf is starting the traced process, at the end events
1971                  * die with the process and we wait for that. Thus no need to
1972                  * disable events in this case.
1973                  */
1974                 if (done && !disabled && !target__none(&opts->target)) {
1975                         trigger_off(&auxtrace_snapshot_trigger);
1976                         evlist__disable(rec->evlist);
1977                         disabled = true;
1978                 }
1979         }
1980
1981         trigger_off(&auxtrace_snapshot_trigger);
1982         trigger_off(&switch_output_trigger);
1983
1984         if (opts->auxtrace_snapshot_on_exit)
1985                 record__auxtrace_snapshot_exit(rec);
1986
1987         if (forks && workload_exec_errno) {
1988                 char msg[STRERR_BUFSIZE], strevsels[2048];
1989                 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
1990
1991                 evlist__scnprintf_evsels(rec->evlist, sizeof(strevsels), strevsels);
1992
1993                 pr_err("Failed to collect '%s' for the '%s' workload: %s\n",
1994                         strevsels, argv[0], emsg);
1995                 err = -1;
1996                 goto out_child;
1997         }
1998
1999         if (!quiet)
2000                 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
2001
2002         if (target__none(&rec->opts.target))
2003                 record__synthesize_workload(rec, true);
2004
2005 out_child:
2006         evlist__finalize_ctlfd(rec->evlist);
2007         record__mmap_read_all(rec, true);
2008         record__aio_mmap_read_sync(rec);
2009
2010         if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
2011                 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
2012                 session->header.env.comp_ratio = ratio + 0.5;
2013         }
2014
2015         if (forks) {
2016                 int exit_status;
2017
2018                 if (!child_finished)
2019                         kill(rec->evlist->workload.pid, SIGTERM);
2020
2021                 wait(&exit_status);
2022
2023                 if (err < 0)
2024                         status = err;
2025                 else if (WIFEXITED(exit_status))
2026                         status = WEXITSTATUS(exit_status);
2027                 else if (WIFSIGNALED(exit_status))
2028                         signr = WTERMSIG(exit_status);
2029         } else
2030                 status = err;
2031
2032         record__synthesize(rec, true);
2033         /* this will be recalculated during process_buildids() */
2034         rec->samples = 0;
2035
2036         if (!err) {
2037                 if (!rec->timestamp_filename) {
2038                         record__finish_output(rec);
2039                 } else {
2040                         fd = record__switch_output(rec, true);
2041                         if (fd < 0) {
2042                                 status = fd;
2043                                 goto out_delete_session;
2044                         }
2045                 }
2046         }
2047
2048         perf_hooks__invoke_record_end();
2049
2050         if (!err && !quiet) {
2051                 char samples[128];
2052                 const char *postfix = rec->timestamp_filename ?
2053                                         ".<timestamp>" : "";
2054
2055                 if (rec->samples && !rec->opts.full_auxtrace)
2056                         scnprintf(samples, sizeof(samples),
2057                                   " (%" PRIu64 " samples)", rec->samples);
2058                 else
2059                         samples[0] = '\0';
2060
2061                 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s",
2062                         perf_data__size(data) / 1024.0 / 1024.0,
2063                         data->path, postfix, samples);
2064                 if (ratio) {
2065                         fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)",
2066                                         rec->session->bytes_transferred / 1024.0 / 1024.0,
2067                                         ratio);
2068                 }
2069                 fprintf(stderr, " ]\n");
2070         }
2071
2072 out_delete_session:
2073 #ifdef HAVE_EVENTFD_SUPPORT
2074         if (done_fd >= 0)
2075                 close(done_fd);
2076 #endif
2077         zstd_fini(&session->zstd_data);
2078         perf_session__delete(session);
2079
2080         if (!opts->no_bpf_event)
2081                 evlist__stop_sb_thread(rec->sb_evlist);
2082         return status;
2083 }
2084
2085 static void callchain_debug(struct callchain_param *callchain)
2086 {
2087         static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
2088
2089         pr_debug("callchain: type %s\n", str[callchain->record_mode]);
2090
2091         if (callchain->record_mode == CALLCHAIN_DWARF)
2092                 pr_debug("callchain: stack dump size %d\n",
2093                          callchain->dump_size);
2094 }
2095
2096 int record_opts__parse_callchain(struct record_opts *record,
2097                                  struct callchain_param *callchain,
2098                                  const char *arg, bool unset)
2099 {
2100         int ret;
2101         callchain->enabled = !unset;
2102
2103         /* --no-call-graph */
2104         if (unset) {
2105                 callchain->record_mode = CALLCHAIN_NONE;
2106                 pr_debug("callchain: disabled\n");
2107                 return 0;
2108         }
2109
2110         ret = parse_callchain_record_opt(arg, callchain);
2111         if (!ret) {
2112                 /* Enable data address sampling for DWARF unwind. */
2113                 if (callchain->record_mode == CALLCHAIN_DWARF)
2114                         record->sample_address = true;
2115                 callchain_debug(callchain);
2116         }
2117
2118         return ret;
2119 }
2120
2121 int record_parse_callchain_opt(const struct option *opt,
2122                                const char *arg,
2123                                int unset)
2124 {
2125         return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
2126 }
2127
2128 int record_callchain_opt(const struct option *opt,
2129                          const char *arg __maybe_unused,
2130                          int unset __maybe_unused)
2131 {
2132         struct callchain_param *callchain = opt->value;
2133
2134         callchain->enabled = true;
2135
2136         if (callchain->record_mode == CALLCHAIN_NONE)
2137                 callchain->record_mode = CALLCHAIN_FP;
2138
2139         callchain_debug(callchain);
2140         return 0;
2141 }
2142
2143 static int perf_record_config(const char *var, const char *value, void *cb)
2144 {
2145         struct record *rec = cb;
2146
2147         if (!strcmp(var, "record.build-id")) {
2148                 if (!strcmp(value, "cache"))
2149                         rec->no_buildid_cache = false;
2150                 else if (!strcmp(value, "no-cache"))
2151                         rec->no_buildid_cache = true;
2152                 else if (!strcmp(value, "skip"))
2153                         rec->no_buildid = true;
2154                 else if (!strcmp(value, "mmap"))
2155                         rec->buildid_mmap = true;
2156                 else
2157                         return -1;
2158                 return 0;
2159         }
2160         if (!strcmp(var, "record.call-graph")) {
2161                 var = "call-graph.record-mode";
2162                 return perf_default_config(var, value, cb);
2163         }
2164 #ifdef HAVE_AIO_SUPPORT
2165         if (!strcmp(var, "record.aio")) {
2166                 rec->opts.nr_cblocks = strtol(value, NULL, 0);
2167                 if (!rec->opts.nr_cblocks)
2168                         rec->opts.nr_cblocks = nr_cblocks_default;
2169         }
2170 #endif
2171
2172         return 0;
2173 }
2174
2175
2176 static int record__parse_affinity(const struct option *opt, const char *str, int unset)
2177 {
2178         struct record_opts *opts = (struct record_opts *)opt->value;
2179
2180         if (unset || !str)
2181                 return 0;
2182
2183         if (!strcasecmp(str, "node"))
2184                 opts->affinity = PERF_AFFINITY_NODE;
2185         else if (!strcasecmp(str, "cpu"))
2186                 opts->affinity = PERF_AFFINITY_CPU;
2187
2188         return 0;
2189 }
2190
2191 static int parse_output_max_size(const struct option *opt,
2192                                  const char *str, int unset)
2193 {
2194         unsigned long *s = (unsigned long *)opt->value;
2195         static struct parse_tag tags_size[] = {
2196                 { .tag  = 'B', .mult = 1       },
2197                 { .tag  = 'K', .mult = 1 << 10 },
2198                 { .tag  = 'M', .mult = 1 << 20 },
2199                 { .tag  = 'G', .mult = 1 << 30 },
2200                 { .tag  = 0 },
2201         };
2202         unsigned long val;
2203
2204         if (unset) {
2205                 *s = 0;
2206                 return 0;
2207         }
2208
2209         val = parse_tag_value(str, tags_size);
2210         if (val != (unsigned long) -1) {
2211                 *s = val;
2212                 return 0;
2213         }
2214
2215         return -1;
2216 }
2217
2218 static int record__parse_mmap_pages(const struct option *opt,
2219                                     const char *str,
2220                                     int unset __maybe_unused)
2221 {
2222         struct record_opts *opts = opt->value;
2223         char *s, *p;
2224         unsigned int mmap_pages;
2225         int ret;
2226
2227         if (!str)
2228                 return -EINVAL;
2229
2230         s = strdup(str);
2231         if (!s)
2232                 return -ENOMEM;
2233
2234         p = strchr(s, ',');
2235         if (p)
2236                 *p = '\0';
2237
2238         if (*s) {
2239                 ret = __evlist__parse_mmap_pages(&mmap_pages, s);
2240                 if (ret)
2241                         goto out_free;
2242                 opts->mmap_pages = mmap_pages;
2243         }
2244
2245         if (!p) {
2246                 ret = 0;
2247                 goto out_free;
2248         }
2249
2250         ret = __evlist__parse_mmap_pages(&mmap_pages, p + 1);
2251         if (ret)
2252                 goto out_free;
2253
2254         opts->auxtrace_mmap_pages = mmap_pages;
2255
2256 out_free:
2257         free(s);
2258         return ret;
2259 }
2260
2261 static int parse_control_option(const struct option *opt,
2262                                 const char *str,
2263                                 int unset __maybe_unused)
2264 {
2265         struct record_opts *opts = opt->value;
2266
2267         return evlist__parse_control(str, &opts->ctl_fd, &opts->ctl_fd_ack, &opts->ctl_fd_close);
2268 }
2269
2270 static void switch_output_size_warn(struct record *rec)
2271 {
2272         u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
2273         struct switch_output *s = &rec->switch_output;
2274
2275         wakeup_size /= 2;
2276
2277         if (s->size < wakeup_size) {
2278                 char buf[100];
2279
2280                 unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
2281                 pr_warning("WARNING: switch-output data size lower than "
2282                            "wakeup kernel buffer size (%s) "
2283                            "expect bigger perf.data sizes\n", buf);
2284         }
2285 }
2286
2287 static int switch_output_setup(struct record *rec)
2288 {
2289         struct switch_output *s = &rec->switch_output;
2290         static struct parse_tag tags_size[] = {
2291                 { .tag  = 'B', .mult = 1       },
2292                 { .tag  = 'K', .mult = 1 << 10 },
2293                 { .tag  = 'M', .mult = 1 << 20 },
2294                 { .tag  = 'G', .mult = 1 << 30 },
2295                 { .tag  = 0 },
2296         };
2297         static struct parse_tag tags_time[] = {
2298                 { .tag  = 's', .mult = 1        },
2299                 { .tag  = 'm', .mult = 60       },
2300                 { .tag  = 'h', .mult = 60*60    },
2301                 { .tag  = 'd', .mult = 60*60*24 },
2302                 { .tag  = 0 },
2303         };
2304         unsigned long val;
2305
2306         /*
2307          * If we're using --switch-output-events, then we imply its
2308          * --switch-output=signal, as we'll send a SIGUSR2 from the side band
2309          *  thread to its parent.
2310          */
2311         if (rec->switch_output_event_set)
2312                 goto do_signal;
2313
2314         if (!s->set)
2315                 return 0;
2316
2317         if (!strcmp(s->str, "signal")) {
2318 do_signal:
2319                 s->signal = true;
2320                 pr_debug("switch-output with SIGUSR2 signal\n");
2321                 goto enabled;
2322         }
2323
2324         val = parse_tag_value(s->str, tags_size);
2325         if (val != (unsigned long) -1) {
2326                 s->size = val;
2327                 pr_debug("switch-output with %s size threshold\n", s->str);
2328                 goto enabled;
2329         }
2330
2331         val = parse_tag_value(s->str, tags_time);
2332         if (val != (unsigned long) -1) {
2333                 s->time = val;
2334                 pr_debug("switch-output with %s time threshold (%lu seconds)\n",
2335                          s->str, s->time);
2336                 goto enabled;
2337         }
2338
2339         return -1;
2340
2341 enabled:
2342         rec->timestamp_filename = true;
2343         s->enabled              = true;
2344
2345         if (s->size && !rec->opts.no_buffering)
2346                 switch_output_size_warn(rec);
2347
2348         return 0;
2349 }
2350
2351 static const char * const __record_usage[] = {
2352         "perf record [<options>] [<command>]",
2353         "perf record [<options>] -- <command> [<options>]",
2354         NULL
2355 };
2356 const char * const *record_usage = __record_usage;
2357
2358 static int build_id__process_mmap(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         return perf_event__process_mmap(tool, event, sample, machine);
2368 }
2369
2370 static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event,
2371                                    struct perf_sample *sample, struct machine *machine)
2372 {
2373         /*
2374          * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
2375          * no need to add them twice.
2376          */
2377         if (!(event->header.misc & PERF_RECORD_MISC_USER))
2378                 return 0;
2379
2380         return perf_event__process_mmap2(tool, event, sample, machine);
2381 }
2382
2383 static int process_timestamp_boundary(struct perf_tool *tool,
2384                                       union perf_event *event __maybe_unused,
2385                                       struct perf_sample *sample,
2386                                       struct machine *machine __maybe_unused)
2387 {
2388         struct record *rec = container_of(tool, struct record, tool);
2389
2390         set_timestamp_boundary(rec, sample->time);
2391         return 0;
2392 }
2393
2394 /*
2395  * XXX Ideally would be local to cmd_record() and passed to a record__new
2396  * because we need to have access to it in record__exit, that is called
2397  * after cmd_record() exits, but since record_options need to be accessible to
2398  * builtin-script, leave it here.
2399  *
2400  * At least we don't ouch it in all the other functions here directly.
2401  *
2402  * Just say no to tons of global variables, sigh.
2403  */
2404 static struct record record = {
2405         .opts = {
2406                 .sample_time         = true,
2407                 .mmap_pages          = UINT_MAX,
2408                 .user_freq           = UINT_MAX,
2409                 .user_interval       = ULLONG_MAX,
2410                 .freq                = 4000,
2411                 .target              = {
2412                         .uses_mmap   = true,
2413                         .default_per_cpu = true,
2414                 },
2415                 .mmap_flush          = MMAP_FLUSH_DEFAULT,
2416                 .nr_threads_synthesize = 1,
2417                 .ctl_fd              = -1,
2418                 .ctl_fd_ack          = -1,
2419         },
2420         .tool = {
2421                 .sample         = process_sample_event,
2422                 .fork           = perf_event__process_fork,
2423                 .exit           = perf_event__process_exit,
2424                 .comm           = perf_event__process_comm,
2425                 .namespaces     = perf_event__process_namespaces,
2426                 .mmap           = build_id__process_mmap,
2427                 .mmap2          = build_id__process_mmap2,
2428                 .itrace_start   = process_timestamp_boundary,
2429                 .aux            = process_timestamp_boundary,
2430                 .ordered_events = true,
2431         },
2432 };
2433
2434 const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
2435         "\n\t\t\t\tDefault: fp";
2436
2437 static bool dry_run;
2438
2439 /*
2440  * XXX Will stay a global variable till we fix builtin-script.c to stop messing
2441  * with it and switch to use the library functions in perf_evlist that came
2442  * from builtin-record.c, i.e. use record_opts,
2443  * evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
2444  * using pipes, etc.
2445  */
2446 static struct option __record_options[] = {
2447         OPT_CALLBACK('e', "event", &record.evlist, "event",
2448                      "event selector. use 'perf list' to list available events",
2449                      parse_events_option),
2450         OPT_CALLBACK(0, "filter", &record.evlist, "filter",
2451                      "event filter", parse_filter),
2452         OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
2453                            NULL, "don't record events from perf itself",
2454                            exclude_perf),
2455         OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
2456                     "record events on existing process id"),
2457         OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
2458                     "record events on existing thread id"),
2459         OPT_INTEGER('r', "realtime", &record.realtime_prio,
2460                     "collect data with this RT SCHED_FIFO priority"),
2461         OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
2462                     "collect data without buffering"),
2463         OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
2464                     "collect raw sample records from all opened counters"),
2465         OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
2466                             "system-wide collection from all CPUs"),
2467         OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
2468                     "list of cpus to monitor"),
2469         OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
2470         OPT_STRING('o', "output", &record.data.path, "file",
2471                     "output file name"),
2472         OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
2473                         &record.opts.no_inherit_set,
2474                         "child tasks do not inherit counters"),
2475         OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
2476                     "synthesize non-sample events at the end of output"),
2477         OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
2478         OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"),
2479         OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
2480                     "Fail if the specified frequency can't be used"),
2481         OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
2482                      "profile at this frequency",
2483                       record__parse_freq),
2484         OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
2485                      "number of mmap data pages and AUX area tracing mmap pages",
2486                      record__parse_mmap_pages),
2487         OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
2488                      "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
2489                      record__mmap_flush_parse),
2490         OPT_BOOLEAN(0, "group", &record.opts.group,
2491                     "put the counters into a counter group"),
2492         OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
2493                            NULL, "enables call-graph recording" ,
2494                            &record_callchain_opt),
2495         OPT_CALLBACK(0, "call-graph", &record.opts,
2496                      "record_mode[,record_size]", record_callchain_help,
2497                      &record_parse_callchain_opt),
2498         OPT_INCR('v', "verbose", &verbose,
2499                     "be more verbose (show counter open errors, etc)"),
2500         OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
2501         OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
2502                     "per thread counts"),
2503         OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
2504         OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
2505                     "Record the sample physical addresses"),
2506         OPT_BOOLEAN(0, "data-page-size", &record.opts.sample_data_page_size,
2507                     "Record the sampled data address data page size"),
2508         OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size,
2509                     "Record the sampled code address (ip) page size"),
2510         OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
2511         OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
2512                         &record.opts.sample_time_set,
2513                         "Record the sample timestamps"),
2514         OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
2515                         "Record the sample period"),
2516         OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
2517                     "don't sample"),
2518         OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
2519                         &record.no_buildid_cache_set,
2520                         "do not update the buildid cache"),
2521         OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
2522                         &record.no_buildid_set,
2523                         "do not collect buildids in perf.data"),
2524         OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
2525                      "monitor event in cgroup name only",
2526                      parse_cgroups),
2527         OPT_INTEGER('D', "delay", &record.opts.initial_delay,
2528                   "ms to wait before starting measurement after program start (-1: start with events disabled)"),
2529         OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"),
2530         OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
2531                    "user to profile"),
2532
2533         OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
2534                      "branch any", "sample any taken branches",
2535                      parse_branch_stack),
2536
2537         OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
2538                      "branch filter mask", "branch stack filter modes",
2539                      parse_branch_stack),
2540         OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
2541                     "sample by weight (on special events only)"),
2542         OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
2543                     "sample transaction flags (special events only)"),
2544         OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
2545                     "use per-thread mmaps"),
2546         OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
2547                     "sample selected machine registers on interrupt,"
2548                     " use '-I?' to list register names", parse_intr_regs),
2549         OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
2550                     "sample selected machine registers on interrupt,"
2551                     " use '--user-regs=?' to list register names", parse_user_regs),
2552         OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
2553                     "Record running/enabled time of read (:S) events"),
2554         OPT_CALLBACK('k', "clockid", &record.opts,
2555         "clockid", "clockid to use for events, see clock_gettime()",
2556         parse_clockid),
2557         OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
2558                           "opts", "AUX area tracing Snapshot Mode", ""),
2559         OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts,
2560                           "opts", "sample AUX area", ""),
2561         OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
2562                         "per thread proc mmap processing timeout in ms"),
2563         OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
2564                     "Record namespaces events"),
2565         OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
2566                     "Record cgroup events"),
2567         OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events,
2568                         &record.opts.record_switch_events_set,
2569                         "Record context switch events"),
2570         OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
2571                          "Configure all used events to run in kernel space.",
2572                          PARSE_OPT_EXCLUSIVE),
2573         OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
2574                          "Configure all used events to run in user space.",
2575                          PARSE_OPT_EXCLUSIVE),
2576         OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
2577                     "collect kernel callchains"),
2578         OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
2579                     "collect user callchains"),
2580         OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
2581                    "clang binary to use for compiling BPF scriptlets"),
2582         OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
2583                    "options passed to clang when compiling BPF scriptlets"),
2584         OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
2585                    "file", "vmlinux pathname"),
2586         OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
2587                     "Record build-id of all DSOs regardless of hits"),
2588         OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap,
2589                     "Record build-id in map events"),
2590         OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
2591                     "append timestamp to output filename"),
2592         OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
2593                     "Record timestamp boundary (time of first/last samples)"),
2594         OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
2595                           &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
2596                           "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
2597                           "signal"),
2598         OPT_CALLBACK_SET(0, "switch-output-event", &record.sb_evlist, &record.switch_output_event_set, "switch output event",
2599                          "switch output event selector. use 'perf list' to list available events",
2600                          parse_events_option_new_evlist),
2601         OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
2602                    "Limit number of switch output generated files"),
2603         OPT_BOOLEAN(0, "dry-run", &dry_run,
2604                     "Parse options then exit"),
2605 #ifdef HAVE_AIO_SUPPORT
2606         OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
2607                      &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
2608                      record__aio_parse),
2609 #endif
2610         OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
2611                      "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
2612                      record__parse_affinity),
2613 #ifdef HAVE_ZSTD_SUPPORT
2614         OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default,
2615                             "n", "Compressed records using specified level (default: 1 - fastest compression, 22 - greatest compression)",
2616                             record__parse_comp_level),
2617 #endif
2618         OPT_CALLBACK(0, "max-size", &record.output_max_size,
2619                      "size", "Limit the maximum size of the output file", parse_output_max_size),
2620         OPT_UINTEGER(0, "num-thread-synthesize",
2621                      &record.opts.nr_threads_synthesize,
2622                      "number of threads to run for event synthesis"),
2623 #ifdef HAVE_LIBPFM
2624         OPT_CALLBACK(0, "pfm-events", &record.evlist, "event",
2625                 "libpfm4 event selector. use 'perf list' to list available events",
2626                 parse_libpfm_events_option),
2627 #endif
2628         OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]",
2629                      "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events,\n"
2630                      "\t\t\t  'snapshot': AUX area tracing snapshot).\n"
2631                      "\t\t\t  Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n"
2632                      "\t\t\t  Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.",
2633                       parse_control_option),
2634         OPT_END()
2635 };
2636
2637 struct option *record_options = __record_options;
2638
2639 int cmd_record(int argc, const char **argv)
2640 {
2641         int err;
2642         struct record *rec = &record;
2643         char errbuf[BUFSIZ];
2644
2645         setlocale(LC_ALL, "");
2646
2647 #ifndef HAVE_LIBBPF_SUPPORT
2648 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c)
2649         set_nobuild('\0', "clang-path", true);
2650         set_nobuild('\0', "clang-opt", true);
2651 # undef set_nobuild
2652 #endif
2653
2654 #ifndef HAVE_BPF_PROLOGUE
2655 # if !defined (HAVE_DWARF_SUPPORT)
2656 #  define REASON  "NO_DWARF=1"
2657 # elif !defined (HAVE_LIBBPF_SUPPORT)
2658 #  define REASON  "NO_LIBBPF=1"
2659 # else
2660 #  define REASON  "this architecture doesn't support BPF prologue"
2661 # endif
2662 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
2663         set_nobuild('\0', "vmlinux", true);
2664 # undef set_nobuild
2665 # undef REASON
2666 #endif
2667
2668         rec->opts.affinity = PERF_AFFINITY_SYS;
2669
2670         rec->evlist = evlist__new();
2671         if (rec->evlist == NULL)
2672                 return -ENOMEM;
2673
2674         err = perf_config(perf_record_config, rec);
2675         if (err)
2676                 return err;
2677
2678         argc = parse_options(argc, argv, record_options, record_usage,
2679                             PARSE_OPT_STOP_AT_NON_OPTION);
2680         if (quiet)
2681                 perf_quiet_option();
2682
2683         /* Make system wide (-a) the default target. */
2684         if (!argc && target__none(&rec->opts.target))
2685                 rec->opts.target.system_wide = true;
2686
2687         if (nr_cgroups && !rec->opts.target.system_wide) {
2688                 usage_with_options_msg(record_usage, record_options,
2689                         "cgroup monitoring only available in system-wide mode");
2690
2691         }
2692
2693         if (rec->buildid_mmap) {
2694                 if (!perf_can_record_build_id()) {
2695                         pr_err("Failed: no support to record build id in mmap events, update your kernel.\n");
2696                         err = -EINVAL;
2697                         goto out_opts;
2698                 }
2699                 pr_debug("Enabling build id in mmap2 events.\n");
2700                 /* Enable mmap build id synthesizing. */
2701                 symbol_conf.buildid_mmap2 = true;
2702                 /* Enable perf_event_attr::build_id bit. */
2703                 rec->opts.build_id = true;
2704                 /* Disable build id cache. */
2705                 rec->no_buildid = true;
2706         }
2707
2708         if (rec->opts.record_cgroup && !perf_can_record_cgroup()) {
2709                 pr_err("Kernel has no cgroup sampling support.\n");
2710                 err = -EINVAL;
2711                 goto out_opts;
2712         }
2713
2714         if (rec->opts.kcore)
2715                 rec->data.is_dir = true;
2716
2717         if (rec->opts.comp_level != 0) {
2718                 pr_debug("Compression enabled, disabling build id collection at the end of the session.\n");
2719                 rec->no_buildid = true;
2720         }
2721
2722         if (rec->opts.record_switch_events &&
2723             !perf_can_record_switch_events()) {
2724                 ui__error("kernel does not support recording context switch events\n");
2725                 parse_options_usage(record_usage, record_options, "switch-events", 0);
2726                 err = -EINVAL;
2727                 goto out_opts;
2728         }
2729
2730         if (switch_output_setup(rec)) {
2731                 parse_options_usage(record_usage, record_options, "switch-output", 0);
2732                 err = -EINVAL;
2733                 goto out_opts;
2734         }
2735
2736         if (rec->switch_output.time) {
2737                 signal(SIGALRM, alarm_sig_handler);
2738                 alarm(rec->switch_output.time);
2739         }
2740
2741         if (rec->switch_output.num_files) {
2742                 rec->switch_output.filenames = calloc(sizeof(char *),
2743                                                       rec->switch_output.num_files);
2744                 if (!rec->switch_output.filenames) {
2745                         err = -EINVAL;
2746                         goto out_opts;
2747                 }
2748         }
2749
2750         /*
2751          * Allow aliases to facilitate the lookup of symbols for address
2752          * filters. Refer to auxtrace_parse_filters().
2753          */
2754         symbol_conf.allow_aliases = true;
2755
2756         symbol__init(NULL);
2757
2758         if (rec->opts.affinity != PERF_AFFINITY_SYS) {
2759                 rec->affinity_mask.nbits = cpu__max_cpu();
2760                 rec->affinity_mask.bits = bitmap_zalloc(rec->affinity_mask.nbits);
2761                 if (!rec->affinity_mask.bits) {
2762                         pr_err("Failed to allocate thread mask for %zd cpus\n", rec->affinity_mask.nbits);
2763                         err = -ENOMEM;
2764                         goto out_opts;
2765                 }
2766                 pr_debug2("thread mask[%zd]: empty\n", rec->affinity_mask.nbits);
2767         }
2768
2769         err = record__auxtrace_init(rec);
2770         if (err)
2771                 goto out;
2772
2773         if (dry_run)
2774                 goto out;
2775
2776         err = bpf__setup_stdout(rec->evlist);
2777         if (err) {
2778                 bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf));
2779                 pr_err("ERROR: Setup BPF stdout failed: %s\n",
2780                          errbuf);
2781                 goto out;
2782         }
2783
2784         err = -ENOMEM;
2785
2786         if (rec->no_buildid_cache || rec->no_buildid) {
2787                 disable_buildid_cache();
2788         } else if (rec->switch_output.enabled) {
2789                 /*
2790                  * In 'perf record --switch-output', disable buildid
2791                  * generation by default to reduce data file switching
2792                  * overhead. Still generate buildid if they are required
2793                  * explicitly using
2794                  *
2795                  *  perf record --switch-output --no-no-buildid \
2796                  *              --no-no-buildid-cache
2797                  *
2798                  * Following code equals to:
2799                  *
2800                  * if ((rec->no_buildid || !rec->no_buildid_set) &&
2801                  *     (rec->no_buildid_cache || !rec->no_buildid_cache_set))
2802                  *         disable_buildid_cache();
2803                  */
2804                 bool disable = true;
2805
2806                 if (rec->no_buildid_set && !rec->no_buildid)
2807                         disable = false;
2808                 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
2809                         disable = false;
2810                 if (disable) {
2811                         rec->no_buildid = true;
2812                         rec->no_buildid_cache = true;
2813                         disable_buildid_cache();
2814                 }
2815         }
2816
2817         if (record.opts.overwrite)
2818                 record.opts.tail_synthesize = true;
2819
2820         if (rec->evlist->core.nr_entries == 0) {
2821                 if (perf_pmu__has_hybrid()) {
2822                         err = evlist__add_default_hybrid(rec->evlist,
2823                                                          !record.opts.no_samples);
2824                 } else {
2825                         err = __evlist__add_default(rec->evlist,
2826                                                     !record.opts.no_samples);
2827                 }
2828
2829                 if (err < 0) {
2830                         pr_err("Not enough memory for event selector list\n");
2831                         goto out;
2832                 }
2833         }
2834
2835         if (rec->opts.target.tid && !rec->opts.no_inherit_set)
2836                 rec->opts.no_inherit = true;
2837
2838         err = target__validate(&rec->opts.target);
2839         if (err) {
2840                 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2841                 ui__warning("%s\n", errbuf);
2842         }
2843
2844         err = target__parse_uid(&rec->opts.target);
2845         if (err) {
2846                 int saved_errno = errno;
2847
2848                 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2849                 ui__error("%s", errbuf);
2850
2851                 err = -saved_errno;
2852                 goto out;
2853         }
2854
2855         /* Enable ignoring missing threads when -u/-p option is defined. */
2856         rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
2857
2858         if (evlist__fix_hybrid_cpus(rec->evlist, rec->opts.target.cpu_list)) {
2859                 pr_err("failed to use cpu list %s\n",
2860                        rec->opts.target.cpu_list);
2861                 goto out;
2862         }
2863
2864         rec->opts.target.hybrid = perf_pmu__has_hybrid();
2865         err = -ENOMEM;
2866         if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
2867                 usage_with_options(record_usage, record_options);
2868
2869         err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
2870         if (err)
2871                 goto out;
2872
2873         /*
2874          * We take all buildids when the file contains
2875          * AUX area tracing data because we do not decode the
2876          * trace because it would take too long.
2877          */
2878         if (rec->opts.full_auxtrace)
2879                 rec->buildid_all = true;
2880
2881         if (rec->opts.text_poke) {
2882                 err = record__config_text_poke(rec->evlist);
2883                 if (err) {
2884                         pr_err("record__config_text_poke failed, error %d\n", err);
2885                         goto out;
2886                 }
2887         }
2888
2889         if (record_opts__config(&rec->opts)) {
2890                 err = -EINVAL;
2891                 goto out;
2892         }
2893
2894         if (rec->opts.nr_cblocks > nr_cblocks_max)
2895                 rec->opts.nr_cblocks = nr_cblocks_max;
2896         pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
2897
2898         pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
2899         pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);
2900
2901         if (rec->opts.comp_level > comp_level_max)
2902                 rec->opts.comp_level = comp_level_max;
2903         pr_debug("comp level: %d\n", rec->opts.comp_level);
2904
2905         err = __cmd_record(&record, argc, argv);
2906 out:
2907         bitmap_free(rec->affinity_mask.bits);
2908         evlist__delete(rec->evlist);
2909         symbol__exit();
2910         auxtrace_record__free(rec->itr);
2911 out_opts:
2912         evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close);
2913         return err;
2914 }
2915
2916 static void snapshot_sig_handler(int sig __maybe_unused)
2917 {
2918         struct record *rec = &record;
2919
2920         hit_auxtrace_snapshot_trigger(rec);
2921
2922         if (switch_output_signal(rec))
2923                 trigger_hit(&switch_output_trigger);
2924 }
2925
2926 static void alarm_sig_handler(int sig __maybe_unused)
2927 {
2928         struct record *rec = &record;
2929
2930         if (switch_output_time(rec))
2931                 trigger_hit(&switch_output_trigger);
2932 }