tools/perf/builtin-record.c

   1 /*
   2  * builtin-record.c
   3  *
   4  * Builtin record command: Record the profile of a workload
   5  * (or a CPU, or a PID) into the perf.data output file - for
   6  * later analysis via perf report.
   7  */
   8 #define _FILE_OFFSET_BITS 64
   9
  10 #include "builtin.h"
  11
  12 #include "perf.h"
  13
  14 #include "util/build-id.h"
  15 #include "util/util.h"
  16 #include "util/parse-options.h"
  17 #include "util/parse-events.h"
  18
  19 #include "util/header.h"
  20 #include "util/event.h"
  21 #include "util/evlist.h"
  22 #include "util/evsel.h"
  23 #include "util/debug.h"
  24 #include "util/session.h"
  25 #include "util/tool.h"
  26 #include "util/symbol.h"
  27 #include "util/cpumap.h"
  28 #include "util/thread_map.h"
  29
  30 #include <unistd.h>
  31 #include <sched.h>
  32 #include <sys/mman.h>
  33
  34 enum write_mode_t {
  35         WRITE_FORCE,
  36         WRITE_APPEND
  37 };
  38
  39 struct perf_record {
  40         struct perf_tool        tool;
  41         struct perf_record_opts opts;
  42         u64                     bytes_written;
  43         const char              *output_name;
  44         struct perf_evlist      *evlist;
  45         struct perf_session     *session;
  46         const char              *progname;
  47         int                     output;
  48         unsigned int            page_size;
  49         int                     realtime_prio;
  50         enum write_mode_t       write_mode;
  51         bool                    no_buildid;
  52         bool                    no_buildid_cache;
  53         bool                    force;
  54         bool                    file_new;
  55         bool                    append_file;
  56         long                    samples;
  57         off_t                   post_processing_offset;
  58 };
  59
  60 static void advance_output(struct perf_record *rec, size_t size)
  61 {
  62         rec->bytes_written += size;
  63 }
  64
  65 static void write_output(struct perf_record *rec, void *buf, size_t size)
  66 {
  67         while (size) {
  68                 int ret = write(rec->output, buf, size);
  69
  70                 if (ret < 0)
  71                         die("failed to write");
  72
  73                 size -= ret;
  74                 buf += ret;
  75
  76                 rec->bytes_written += ret;
  77         }
  78 }
  79
  80 static int process_synthesized_event(struct perf_tool *tool,
  81                                      union perf_event *event,
  82                                      struct perf_sample *sample __used,
  83                                      struct machine *machine __used)
  84 {
  85         struct perf_record *rec = container_of(tool, struct perf_record, tool);
  86         write_output(rec, event, event->header.size);
  87         return 0;
  88 }
  89
  90 static void perf_record__mmap_read(struct perf_record *rec,
  91                                    struct perf_mmap *md)
  92 {
  93         unsigned int head = perf_mmap__read_head(md);
  94         unsigned int old = md->prev;
  95         unsigned char *data = md->base + rec->page_size;
  96         unsigned long size;
  97         void *buf;
  98
  99         if (old == head)
 100                 return;
 101
 102         rec->samples++;
 103
 104         size = head - old;
 105
 106         if ((old & md->mask) + size != (head & md->mask)) {
 107                 buf = &data[old & md->mask];
 108                 size = md->mask + 1 - (old & md->mask);
 109                 old += size;
 110
 111                 write_output(rec, buf, size);
 112         }
 113
 114         buf = &data[old & md->mask];
 115         size = head - old;
 116         old += size;
 117
 118         write_output(rec, buf, size);
 119
 120         md->prev = old;
 121         perf_mmap__write_tail(md, old);
 122 }
 123
 124 static volatile int done = 0;
 125 static volatile int signr = -1;
 126 static volatile int child_finished = 0;
 127
 128 static void sig_handler(int sig)
 129 {
 130         if (sig == SIGCHLD)
 131                 child_finished = 1;
 132
 133         done = 1;
 134         signr = sig;
 135 }
 136
 137 static void perf_record__sig_exit(int exit_status __used, void *arg)
 138 {
 139         struct perf_record *rec = arg;
 140         int status;
 141
 142         if (rec->evlist->workload.pid > 0) {
 143                 if (!child_finished)
 144                         kill(rec->evlist->workload.pid, SIGTERM);
 145
 146                 wait(&status);
 147                 if (WIFSIGNALED(status))
 148                         psignal(WTERMSIG(status), rec->progname);
 149         }
 150
 151         if (signr == -1 || signr == SIGUSR1)
 152                 return;
 153
 154         signal(signr, SIG_DFL);
 155         kill(getpid(), signr);
 156 }
 157
 158 static bool perf_evlist__equal(struct perf_evlist *evlist,
 159                                struct perf_evlist *other)
 160 {
 161         struct perf_evsel *pos, *pair;
 162
 163         if (evlist->nr_entries != other->nr_entries)
 164                 return false;
 165
 166         pair = list_entry(other->entries.next, struct perf_evsel, node);
 167
 168         list_for_each_entry(pos, &evlist->entries, node) {
 169                 if (memcmp(&pos->attr, &pair->attr, sizeof(pos->attr) != 0))
 170                         return false;
 171                 pair = list_entry(pair->node.next, struct perf_evsel, node);
 172         }
 173
 174         return true;
 175 }
 176
 177 static void perf_record__open(struct perf_record *rec)
 178 {
 179         struct perf_evsel *pos, *first;
 180         struct perf_evlist *evlist = rec->evlist;
 181         struct perf_session *session = rec->session;
 182         struct perf_record_opts *opts = &rec->opts;
 183
 184         first = list_entry(evlist->entries.next, struct perf_evsel, node);
 185
 186         perf_evlist__config_attrs(evlist, opts);
 187
 188         list_for_each_entry(pos, &evlist->entries, node) {
 189                 struct perf_event_attr *attr = &pos->attr;
 190                 struct xyarray *group_fd = NULL;
 191                 /*
 192                  * Check if parse_single_tracepoint_event has already asked for
 193                  * PERF_SAMPLE_TIME.
 194                  *
 195                  * XXX this is kludgy but short term fix for problems introduced by
 196                  * eac23d1c that broke 'perf script' by having different sample_types
 197                  * when using multiple tracepoint events when we use a perf binary
 198                  * that tries to use sample_id_all on an older kernel.
 199                  *
 200                  * We need to move counter creation to perf_session, support
 201                  * different sample_types, etc.
 202                  */
 203                 bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;
 204
 205                 if (opts->group && pos != first)
 206                         group_fd = first->fd;
 207 retry_sample_id:
 208                 attr->sample_id_all = opts->sample_id_all_avail ? 1 : 0;
 209 try_again:
 210                 if (perf_evsel__open(pos, evlist->cpus, evlist->threads,
 211                                      opts->group, group_fd) < 0) {
 212                         int err = errno;
 213
 214                         if (err == EPERM || err == EACCES) {
 215                                 ui__error_paranoid();
 216                                 exit(EXIT_FAILURE);
 217                         } else if (err ==  ENODEV && opts->cpu_list) {
 218                                 die("No such device - did you specify"
 219                                         " an out-of-range profile CPU?\n");
 220                         } else if (err == EINVAL && opts->sample_id_all_avail) {
 221                                 /*
 222                                  * Old kernel, no attr->sample_id_type_all field
 223                                  */
 224                                 opts->sample_id_all_avail = false;
 225                                 if (!opts->sample_time && !opts->raw_samples && !time_needed)
 226                                         attr->sample_type &= ~PERF_SAMPLE_TIME;
 227
 228                                 goto retry_sample_id;
 229                         }
 230
 231                         /*
 232                          * If it's cycles then fall back to hrtimer
 233                          * based cpu-clock-tick sw counter, which
 234                          * is always available even if no PMU support:
 235                          */
 236                         if (attr->type == PERF_TYPE_HARDWARE
 237                                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
 238
 239                                 if (verbose)
 240                                         ui__warning("The cycles event is not supported, "
 241                                                     "trying to fall back to cpu-clock-ticks\n");
 242                                 attr->type = PERF_TYPE_SOFTWARE;
 243                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
 244                                 goto try_again;
 245                         }
 246
 247                         if (err == ENOENT) {
 248                                 ui__warning("The %s event is not supported.\n",
 249                                             event_name(pos));
 250                                 exit(EXIT_FAILURE);
 251                         }
 252
 253                         printf("\n");
 254                         error("sys_perf_event_open() syscall returned with %d (%s).  /bin/dmesg may provide additional information.\n",
 255                               err, strerror(err));
 256
 257 #if defined(__i386__) || defined(__x86_64__)
 258                         if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
 259                                 die("No hardware sampling interrupt available."
 260                                     " No APIC? If so then you can boot the kernel"
 261                                     " with the \"lapic\" boot parameter to"
 262                                     " force-enable it.\n");
 263 #endif
 264
 265                         die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
 266                 }
 267         }
 268
 269         if (perf_evlist__set_filters(evlist)) {
 270                 error("failed to set filter with %d (%s)\n", errno,
 271                         strerror(errno));
 272                 exit(-1);
 273         }
 274
 275         if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0)
 276                 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
 277
 278         if (rec->file_new)
 279                 session->evlist = evlist;
 280         else {
 281                 if (!perf_evlist__equal(session->evlist, evlist)) {
 282                         fprintf(stderr, "incompatible append\n");
 283                         exit(-1);
 284                 }
 285         }
 286
 287         perf_session__update_sample_type(session);
 288 }
 289
 290 static int process_buildids(struct perf_record *rec)
 291 {
 292         u64 size = lseek(rec->output, 0, SEEK_CUR);
 293
 294         if (size == 0)
 295                 return 0;
 296
 297         rec->session->fd = rec->output;
 298         return __perf_session__process_events(rec->session, rec->post_processing_offset,
 299                                               size - rec->post_processing_offset,
 300                                               size, &build_id__mark_dso_hit_ops);
 301 }
 302
 303 static void perf_record__exit(int status __used, void *arg)
 304 {
 305         struct perf_record *rec = arg;
 306
 307         if (!rec->opts.pipe_output) {
 308                 rec->session->header.data_size += rec->bytes_written;
 309
 310                 if (!rec->no_buildid)
 311                         process_buildids(rec);
 312                 perf_session__write_header(rec->session, rec->evlist,
 313                                            rec->output, true);
 314                 perf_session__delete(rec->session);
 315                 perf_evlist__delete(rec->evlist);
 316                 symbol__exit();
 317         }
 318 }
 319
 320 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
 321 {
 322         int err;
 323         struct perf_tool *tool = data;
 324
 325         if (machine__is_host(machine))
 326                 return;
 327
 328         /*
 329          *As for guest kernel when processing subcommand record&report,
 330          *we arrange module mmap prior to guest kernel mmap and trigger
 331          *a preload dso because default guest module symbols are loaded
 332          *from guest kallsyms instead of /lib/modules/XXX/XXX. This
 333          *method is used to avoid symbol missing when the first addr is
 334          *in module instead of in guest kernel.
 335          */
 336         err = perf_event__synthesize_modules(tool, process_synthesized_event,
 337                                              machine);
 338         if (err < 0)
 339                 pr_err("Couldn't record guest kernel [%d]'s reference"
 340                        " relocation symbol.\n", machine->pid);
 341
 342         /*
 343          * We use _stext for guest kernel because guest kernel's /proc/kallsyms
 344          * have no _text sometimes.
 345          */
 346         err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
 347                                                  machine, "_text");
 348         if (err < 0)
 349                 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
 350                                                          machine, "_stext");
 351         if (err < 0)
 352                 pr_err("Couldn't record guest kernel [%d]'s reference"
 353                        " relocation symbol.\n", machine->pid);
 354 }
 355
 356 static struct perf_event_header finished_round_event = {
 357         .size = sizeof(struct perf_event_header),
 358         .type = PERF_RECORD_FINISHED_ROUND,
 359 };
 360
 361 static void perf_record__mmap_read_all(struct perf_record *rec)
 362 {
 363         int i;
 364
 365         for (i = 0; i < rec->evlist->nr_mmaps; i++) {
 366                 if (rec->evlist->mmap[i].base)
 367                         perf_record__mmap_read(rec, &rec->evlist->mmap[i]);
 368         }
 369
 370         if (perf_header__has_feat(&rec->session->header, HEADER_TRACE_INFO))
 371                 write_output(rec, &finished_round_event, sizeof(finished_round_event));
 372 }
 373
 374 static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
 375 {
 376         struct stat st;
 377         int flags;
 378         int err, output;
 379         unsigned long waking = 0;
 380         const bool forks = argc > 0;
 381         struct machine *machine;
 382         struct perf_tool *tool = &rec->tool;
 383         struct perf_record_opts *opts = &rec->opts;
 384         struct perf_evlist *evsel_list = rec->evlist;
 385         const char *output_name = rec->output_name;
 386         struct perf_session *session;
 387
 388         rec->progname = argv[0];
 389
 390         rec->page_size = sysconf(_SC_PAGE_SIZE);
 391
 392         on_exit(perf_record__sig_exit, rec);
 393         signal(SIGCHLD, sig_handler);
 394         signal(SIGINT, sig_handler);
 395         signal(SIGUSR1, sig_handler);
 396
 397         if (!output_name) {
 398                 if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
 399                         opts->pipe_output = true;
 400                 else
 401                         rec->output_name = output_name = "perf.data";
 402         }
 403         if (output_name) {
 404                 if (!strcmp(output_name, "-"))
 405                         opts->pipe_output = true;
 406                 else if (!stat(output_name, &st) && st.st_size) {
 407                         if (rec->write_mode == WRITE_FORCE) {
 408                                 char oldname[PATH_MAX];
 409                                 snprintf(oldname, sizeof(oldname), "%s.old",
 410                                          output_name);
 411                                 unlink(oldname);
 412                                 rename(output_name, oldname);
 413                         }
 414                 } else if (rec->write_mode == WRITE_APPEND) {
 415                         rec->write_mode = WRITE_FORCE;
 416                 }
 417         }
 418
 419         flags = O_CREAT|O_RDWR;
 420         if (rec->write_mode == WRITE_APPEND)
 421                 rec->file_new = 0;
 422         else
 423                 flags |= O_TRUNC;
 424
 425         if (opts->pipe_output)
 426                 output = STDOUT_FILENO;
 427         else
 428                 output = open(output_name, flags, S_IRUSR | S_IWUSR);
 429         if (output < 0) {
 430                 perror("failed to create output file");
 431                 exit(-1);
 432         }
 433
 434         rec->output = output;
 435
 436         session = perf_session__new(output_name, O_WRONLY,
 437                                     rec->write_mode == WRITE_FORCE, false, NULL);
 438         if (session == NULL) {
 439                 pr_err("Not enough memory for reading perf file header\n");
 440                 return -1;
 441         }
 442
 443         rec->session = session;
 444
 445         if (!rec->no_buildid)
 446                 perf_header__set_feat(&session->header, HEADER_BUILD_ID);
 447
 448         if (!rec->file_new) {
 449                 err = perf_session__read_header(session, output);
 450                 if (err < 0)
 451                         goto out_delete_session;
 452         }
 453
 454         if (have_tracepoints(&evsel_list->entries))
 455                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 456
 457         perf_header__set_feat(&session->header, HEADER_HOSTNAME);
 458         perf_header__set_feat(&session->header, HEADER_OSRELEASE);
 459         perf_header__set_feat(&session->header, HEADER_ARCH);
 460         perf_header__set_feat(&session->header, HEADER_CPUDESC);
 461         perf_header__set_feat(&session->header, HEADER_NRCPUS);
 462         perf_header__set_feat(&session->header, HEADER_EVENT_DESC);
 463         perf_header__set_feat(&session->header, HEADER_CMDLINE);
 464         perf_header__set_feat(&session->header, HEADER_VERSION);
 465         perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY);
 466         perf_header__set_feat(&session->header, HEADER_TOTAL_MEM);
 467         perf_header__set_feat(&session->header, HEADER_NUMA_TOPOLOGY);
 468         perf_header__set_feat(&session->header, HEADER_CPUID);
 469
 470         if (forks) {
 471                 err = perf_evlist__prepare_workload(evsel_list, opts, argv);
 472                 if (err < 0) {
 473                         pr_err("Couldn't run the workload!\n");
 474                         goto out_delete_session;
 475                 }
 476         }
 477
 478         perf_record__open(rec);
 479
 480         /*
 481          * perf_session__delete(session) will be called at perf_record__exit()
 482          */
 483         on_exit(perf_record__exit, rec);
 484
 485         if (opts->pipe_output) {
 486                 err = perf_header__write_pipe(output);
 487                 if (err < 0)
 488                         return err;
 489         } else if (rec->file_new) {
 490                 err = perf_session__write_header(session, evsel_list,
 491                                                  output, false);
 492                 if (err < 0)
 493                         return err;
 494         }
 495
 496         rec->post_processing_offset = lseek(output, 0, SEEK_CUR);
 497
 498         machine = perf_session__find_host_machine(session);
 499         if (!machine) {
 500                 pr_err("Couldn't find native kernel information.\n");
 501                 return -1;
 502         }
 503
 504         if (opts->pipe_output) {
 505                 err = perf_event__synthesize_attrs(tool, session,
 506                                                    process_synthesized_event);
 507                 if (err < 0) {
 508                         pr_err("Couldn't synthesize attrs.\n");
 509                         return err;
 510                 }
 511
 512                 err = perf_event__synthesize_event_types(tool, process_synthesized_event,
 513                                                          machine);
 514                 if (err < 0) {
 515                         pr_err("Couldn't synthesize event_types.\n");
 516                         return err;
 517                 }
 518
 519                 if (have_tracepoints(&evsel_list->entries)) {
 520                         /*
 521                          * FIXME err <= 0 here actually means that
 522                          * there were no tracepoints so its not really
 523                          * an error, just that we don't need to
 524                          * synthesize anything.  We really have to
 525                          * return this more properly and also
 526                          * propagate errors that now are calling die()
 527                          */
 528                         err = perf_event__synthesize_tracing_data(tool, output, evsel_list,
 529                                                                   process_synthesized_event);
 530                         if (err <= 0) {
 531                                 pr_err("Couldn't record tracing data.\n");
 532                                 return err;
 533                         }
 534                         advance_output(rec, err);
 535                 }
 536         }
 537
 538         err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
 539                                                  machine, "_text");
 540         if (err < 0)
 541                 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
 542                                                          machine, "_stext");
 543         if (err < 0)
 544                 pr_err("Couldn't record kernel reference relocation symbol\n"
 545                        "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
 546                        "Check /proc/kallsyms permission or run as root.\n");
 547
 548         err = perf_event__synthesize_modules(tool, process_synthesized_event,
 549                                              machine);
 550         if (err < 0)
 551                 pr_err("Couldn't record kernel module information.\n"
 552                        "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
 553                        "Check /proc/modules permission or run as root.\n");
 554
 555         if (perf_guest)
 556                 perf_session__process_machines(session, tool,
 557                                                perf_event__synthesize_guest_os);
 558
 559         if (!opts->system_wide)
 560                 perf_event__synthesize_thread_map(tool, evsel_list->threads,
 561                                                   process_synthesized_event,
 562                                                   machine);
 563         else
 564                 perf_event__synthesize_threads(tool, process_synthesized_event,
 565                                                machine);
 566
 567         if (rec->realtime_prio) {
 568                 struct sched_param param;
 569
 570                 param.sched_priority = rec->realtime_prio;
 571                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
 572                         pr_err("Could not set realtime priority.\n");
 573                         exit(-1);
 574                 }
 575         }
 576
 577         perf_evlist__enable(evsel_list);
 578
 579         /*
 580          * Let the child rip
 581          */
 582         if (forks)
 583                 perf_evlist__start_workload(evsel_list);
 584
 585         for (;;) {
 586                 int hits = rec->samples;
 587
 588                 perf_record__mmap_read_all(rec);
 589
 590                 if (hits == rec->samples) {
 591                         if (done)
 592                                 break;
 593                         err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1);
 594                         waking++;
 595                 }
 596
 597                 if (done)
 598                         perf_evlist__disable(evsel_list);
 599         }
 600
 601         if (quiet || signr == SIGUSR1)
 602                 return 0;
 603
 604         fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
 605
 606         /*
 607          * Approximate RIP event size: 24 bytes.
 608          */
 609         fprintf(stderr,
 610                 "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
 611                 (double)rec->bytes_written / 1024.0 / 1024.0,
 612                 output_name,
 613                 rec->bytes_written / 24);
 614
 615         return 0;
 616
 617 out_delete_session:
 618         perf_session__delete(session);
 619         return err;
 620 }
 621
 622 static const char * const record_usage[] = {
 623         "perf record [<options>] [<command>]",
 624         "perf record [<options>] -- <command> [<options>]",
 625         NULL
 626 };
 627
 628 /*
 629  * XXX Ideally would be local to cmd_record() and passed to a perf_record__new
 630  * because we need to have access to it in perf_record__exit, that is called
 631  * after cmd_record() exits, but since record_options need to be accessible to
 632  * builtin-script, leave it here.
 633  *
 634  * At least we don't ouch it in all the other functions here directly.
 635  *
 636  * Just say no to tons of global variables, sigh.
 637  */
 638 static struct perf_record record = {
 639         .opts = {
 640                 .target_pid          = -1,
 641                 .target_tid          = -1,
 642                 .mmap_pages          = UINT_MAX,
 643                 .user_freq           = UINT_MAX,
 644                 .user_interval       = ULLONG_MAX,
 645                 .freq                = 1000,
 646                 .sample_id_all_avail = true,
 647         },
 648         .write_mode = WRITE_FORCE,
 649         .file_new   = true,
 650 };
 651
 652 /*
 653  * XXX Will stay a global variable till we fix builtin-script.c to stop messing
 654  * with it and switch to use the library functions in perf_evlist that came
 655  * from builtin-record.c, i.e. use perf_record_opts,
 656  * perf_evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
 657  * using pipes, etc.
 658  */
 659 const struct option record_options[] = {
 660         OPT_CALLBACK('e', "event", &record.evlist, "event",
 661                      "event selector. use 'perf list' to list available events",
 662                      parse_events_option),
 663         OPT_CALLBACK(0, "filter", &record.evlist, "filter",
 664                      "event filter", parse_filter),
 665         OPT_INTEGER('p', "pid", &record.opts.target_pid,
 666                     "record events on existing process id"),
 667         OPT_INTEGER('t', "tid", &record.opts.target_tid,
 668                     "record events on existing thread id"),
 669         OPT_INTEGER('r', "realtime", &record.realtime_prio,
 670                     "collect data with this RT SCHED_FIFO priority"),
 671         OPT_BOOLEAN('D', "no-delay", &record.opts.no_delay,
 672                     "collect data without buffering"),
 673         OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
 674                     "collect raw sample records from all opened counters"),
 675         OPT_BOOLEAN('a', "all-cpus", &record.opts.system_wide,
 676                             "system-wide collection from all CPUs"),
 677         OPT_BOOLEAN('A', "append", &record.append_file,
 678                             "append to the output file to do incremental profiling"),
 679         OPT_STRING('C', "cpu", &record.opts.cpu_list, "cpu",
 680                     "list of cpus to monitor"),
 681         OPT_BOOLEAN('f', "force", &record.force,
 682                         "overwrite existing data file (deprecated)"),
 683         OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
 684         OPT_STRING('o', "output", &record.output_name, "file",
 685                     "output file name"),
 686         OPT_BOOLEAN('i', "no-inherit", &record.opts.no_inherit,
 687                     "child tasks do not inherit counters"),
 688         OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"),
 689         OPT_UINTEGER('m', "mmap-pages", &record.opts.mmap_pages,
 690                      "number of mmap data pages"),
 691         OPT_BOOLEAN(0, "group", &record.opts.group,
 692                     "put the counters into a counter group"),
 693         OPT_BOOLEAN('g', "call-graph", &record.opts.call_graph,
 694                     "do call-graph (stack chain/backtrace) recording"),
 695         OPT_INCR('v', "verbose", &verbose,
 696                     "be more verbose (show counter open errors, etc)"),
 697         OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
 698         OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
 699                     "per thread counts"),
 700         OPT_BOOLEAN('d', "data", &record.opts.sample_address,
 701                     "Sample addresses"),
 702         OPT_BOOLEAN('T', "timestamp", &record.opts.sample_time, "Sample timestamps"),
 703         OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
 704                     "don't sample"),
 705         OPT_BOOLEAN('N', "no-buildid-cache", &record.no_buildid_cache,
 706                     "do not update the buildid cache"),
 707         OPT_BOOLEAN('B', "no-buildid", &record.no_buildid,
 708                     "do not collect buildids in perf.data"),
 709         OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
 710                      "monitor event in cgroup name only",
 711                      parse_cgroups),
 712         OPT_END()
 713 };
 714
 715 int cmd_record(int argc, const char **argv, const char *prefix __used)
 716 {
 717         int err = -ENOMEM;
 718         struct perf_evsel *pos;
 719         struct perf_evlist *evsel_list;
 720         struct perf_record *rec = &record;
 721
 722         perf_header__set_cmdline(argc, argv);
 723
 724         evsel_list = perf_evlist__new(NULL, NULL);
 725         if (evsel_list == NULL)
 726                 return -ENOMEM;
 727
 728         rec->evlist = evsel_list;
 729
 730         argc = parse_options(argc, argv, record_options, record_usage,
 731                             PARSE_OPT_STOP_AT_NON_OPTION);
 732         if (!argc && rec->opts.target_pid == -1 && rec->opts.target_tid == -1 &&
 733                 !rec->opts.system_wide && !rec->opts.cpu_list)
 734                 usage_with_options(record_usage, record_options);
 735
 736         if (rec->force && rec->append_file) {
 737                 fprintf(stderr, "Can't overwrite and append at the same time."
 738                                 " You need to choose between -f and -A");
 739                 usage_with_options(record_usage, record_options);
 740         } else if (rec->append_file) {
 741                 rec->write_mode = WRITE_APPEND;
 742         } else {
 743                 rec->write_mode = WRITE_FORCE;
 744         }
 745
 746         if (nr_cgroups && !rec->opts.system_wide) {
 747                 fprintf(stderr, "cgroup monitoring only available in"
 748                         " system-wide mode\n");
 749                 usage_with_options(record_usage, record_options);
 750         }
 751
 752         symbol__init();
 753
 754         if (symbol_conf.kptr_restrict)
 755                 pr_warning(
 756 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
 757 "check /proc/sys/kernel/kptr_restrict.\n\n"
 758 "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
 759 "file is not found in the buildid cache or in the vmlinux path.\n\n"
 760 "Samples in kernel modules won't be resolved at all.\n\n"
 761 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
 762 "even with a suitable vmlinux or kallsyms file.\n\n");
 763
 764         if (rec->no_buildid_cache || rec->no_buildid)
 765                 disable_buildid_cache();
 766
 767         if (evsel_list->nr_entries == 0 &&
 768             perf_evlist__add_default(evsel_list) < 0) {
 769                 pr_err("Not enough memory for event selector list\n");
 770                 goto out_symbol_exit;
 771         }
 772
 773         if (rec->opts.target_pid != -1)
 774                 rec->opts.target_tid = rec->opts.target_pid;
 775
 776         if (perf_evlist__create_maps(evsel_list, rec->opts.target_pid,
 777                                      rec->opts.target_tid, rec->opts.cpu_list) < 0)
 778                 usage_with_options(record_usage, record_options);
 779
 780         list_for_each_entry(pos, &evsel_list->entries, node) {
 781                 if (perf_evsel__alloc_fd(pos, evsel_list->cpus->nr,
 782                                          evsel_list->threads->nr) < 0)
 783                         goto out_free_fd;
 784                 if (perf_header__push_event(pos->attr.config, event_name(pos)))
 785                         goto out_free_fd;
 786         }
 787
 788         if (perf_evlist__alloc_pollfd(evsel_list) < 0)
 789                 goto out_free_fd;
 790
 791         if (rec->opts.user_interval != ULLONG_MAX)
 792                 rec->opts.default_interval = rec->opts.user_interval;
 793         if (rec->opts.user_freq != UINT_MAX)
 794                 rec->opts.freq = rec->opts.user_freq;
 795
 796         /*
 797          * User specified count overrides default frequency.
 798          */
 799         if (rec->opts.default_interval)
 800                 rec->opts.freq = 0;
 801         else if (rec->opts.freq) {
 802                 rec->opts.default_interval = rec->opts.freq;
 803         } else {
 804                 fprintf(stderr, "frequency and count are zero, aborting\n");
 805                 err = -EINVAL;
 806                 goto out_free_fd;
 807         }
 808
 809         err = __cmd_record(&record, argc, argv);
 810 out_free_fd:
 811         perf_evlist__delete_maps(evsel_list);
 812 out_symbol_exit:
 813         symbol__exit();
 814         return err;
 815 }