tools/perf/perf.c

   1 /*
   2  * perf.c
   3  *
   4  * Performance analysis utility.
   5  *
   6  * This is the main hub from which the sub-commands (perf stat,
   7  * perf top, perf record, perf report, etc.) are started.
   8  */
   9 #include "builtin.h"
  10
  11 #include "util/env.h"
  12 #include <subcmd/exec-cmd.h>
  13 #include "util/cache.h"
  14 #include "util/quote.h"
  15 #include <subcmd/run-command.h>
  16 #include "util/parse-events.h"
  17 #include <subcmd/parse-options.h>
  18 #include "util/bpf-loader.h"
  19 #include "util/debug.h"
  20 #include <api/fs/fs.h>
  21 #include <api/fs/tracing_path.h>
  22 #include <pthread.h>
  23 #include <stdlib.h>
  24 #include <time.h>
  25
  26 const char perf_usage_string[] =
  27         "perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
  28
  29 const char perf_more_info_string[] =
  30         "See 'perf help COMMAND' for more information on a specific command.";
  31
  32 int use_browser = -1;
  33 static int use_pager = -1;
  34 const char *input_name;
  35
  36 struct cmd_struct {
  37         const char *cmd;
  38         int (*fn)(int, const char **, const char *);
  39         int option;
  40 };
  41
  42 static struct cmd_struct commands[] = {
  43         { "buildid-cache", cmd_buildid_cache, 0 },
  44         { "buildid-list", cmd_buildid_list, 0 },
  45         { "config",     cmd_config,     0 },
  46         { "diff",       cmd_diff,       0 },
  47         { "evlist",     cmd_evlist,     0 },
  48         { "help",       cmd_help,       0 },
  49         { "list",       cmd_list,       0 },
  50         { "record",     cmd_record,     0 },
  51         { "report",     cmd_report,     0 },
  52         { "bench",      cmd_bench,      0 },
  53         { "stat",       cmd_stat,       0 },
  54         { "timechart",  cmd_timechart,  0 },
  55         { "top",        cmd_top,        0 },
  56         { "annotate",   cmd_annotate,   0 },
  57         { "version",    cmd_version,    0 },
  58         { "script",     cmd_script,     0 },
  59         { "sched",      cmd_sched,      0 },
  60 #ifdef HAVE_LIBELF_SUPPORT
  61         { "probe",      cmd_probe,      0 },
  62 #endif
  63         { "kmem",       cmd_kmem,       0 },
  64         { "lock",       cmd_lock,       0 },
  65         { "kvm",        cmd_kvm,        0 },
  66         { "test",       cmd_test,       0 },
  67 #ifdef HAVE_LIBAUDIT_SUPPORT
  68         { "trace",      cmd_trace,      0 },
  69 #endif
  70         { "inject",     cmd_inject,     0 },
  71         { "mem",        cmd_mem,        0 },
  72         { "data",       cmd_data,       0 },
  73 };
  74
  75 struct pager_config {
  76         const char *cmd;
  77         int val;
  78 };
  79
  80 static int pager_command_config(const char *var, const char *value, void *data)
  81 {
  82         struct pager_config *c = data;
  83         if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
  84                 c->val = perf_config_bool(var, value);
  85         return 0;
  86 }
  87
  88 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
  89 int check_pager_config(const char *cmd)
  90 {
  91         struct pager_config c;
  92         c.cmd = cmd;
  93         c.val = -1;
  94         perf_config(pager_command_config, &c);
  95         return c.val;
  96 }
  97
  98 static int browser_command_config(const char *var, const char *value, void *data)
  99 {
 100         struct pager_config *c = data;
 101         if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
 102                 c->val = perf_config_bool(var, value);
 103         if (!prefixcmp(var, "gtk.") && !strcmp(var + 4, c->cmd))
 104                 c->val = perf_config_bool(var, value) ? 2 : 0;
 105         return 0;
 106 }
 107
 108 /*
 109  * returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
 110  * and -1 for "not specified"
 111  */
 112 static int check_browser_config(const char *cmd)
 113 {
 114         struct pager_config c;
 115         c.cmd = cmd;
 116         c.val = -1;
 117         perf_config(browser_command_config, &c);
 118         return c.val;
 119 }
 120
 121 static void commit_pager_choice(void)
 122 {
 123         switch (use_pager) {
 124         case 0:
 125                 setenv(PERF_PAGER_ENVIRONMENT, "cat", 1);
 126                 break;
 127         case 1:
 128                 /* setup_pager(); */
 129                 break;
 130         default:
 131                 break;
 132         }
 133 }
 134
 135 struct option options[] = {
 136         OPT_ARGUMENT("help", "help"),
 137         OPT_ARGUMENT("version", "version"),
 138         OPT_ARGUMENT("exec-path", "exec-path"),
 139         OPT_ARGUMENT("html-path", "html-path"),
 140         OPT_ARGUMENT("paginate", "paginate"),
 141         OPT_ARGUMENT("no-pager", "no-pager"),
 142         OPT_ARGUMENT("perf-dir", "perf-dir"),
 143         OPT_ARGUMENT("work-tree", "work-tree"),
 144         OPT_ARGUMENT("debugfs-dir", "debugfs-dir"),
 145         OPT_ARGUMENT("buildid-dir", "buildid-dir"),
 146         OPT_ARGUMENT("list-cmds", "list-cmds"),
 147         OPT_ARGUMENT("list-opts", "list-opts"),
 148         OPT_ARGUMENT("debug", "debug"),
 149         OPT_END()
 150 };
 151
 152 static int handle_options(const char ***argv, int *argc, int *envchanged)
 153 {
 154         int handled = 0;
 155
 156         while (*argc > 0) {
 157                 const char *cmd = (*argv)[0];
 158                 if (cmd[0] != '-')
 159                         break;
 160
 161                 /*
 162                  * For legacy reasons, the "version" and "help"
 163                  * commands can be written with "--" prepended
 164                  * to make them look like flags.
 165                  */
 166                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
 167                         break;
 168
 169                 /*
 170                  * Shortcut for '-h' and '-v' options to invoke help
 171                  * and version command.
 172                  */
 173                 if (!strcmp(cmd, "-h")) {
 174                         (*argv)[0] = "--help";
 175                         break;
 176                 }
 177
 178                 if (!strcmp(cmd, "-v")) {
 179                         (*argv)[0] = "--version";
 180                         break;
 181                 }
 182
 183                 /*
 184                  * Check remaining flags.
 185                  */
 186                 if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
 187                         cmd += strlen(CMD_EXEC_PATH);
 188                         if (*cmd == '=')
 189                                 set_argv_exec_path(cmd + 1);
 190                         else {
 191                                 puts(get_argv_exec_path());
 192                                 exit(0);
 193                         }
 194                 } else if (!strcmp(cmd, "--html-path")) {
 195                         puts(system_path(PERF_HTML_PATH));
 196                         exit(0);
 197                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
 198                         use_pager = 1;
 199                 } else if (!strcmp(cmd, "--no-pager")) {
 200                         use_pager = 0;
 201                         if (envchanged)
 202                                 *envchanged = 1;
 203                 } else if (!strcmp(cmd, "--perf-dir")) {
 204                         if (*argc < 2) {
 205                                 fprintf(stderr, "No directory given for --perf-dir.\n");
 206                                 usage(perf_usage_string);
 207                         }
 208                         setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1);
 209                         if (envchanged)
 210                                 *envchanged = 1;
 211                         (*argv)++;
 212                         (*argc)--;
 213                         handled++;
 214                 } else if (!prefixcmp(cmd, CMD_PERF_DIR)) {
 215                         setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1);
 216                         if (envchanged)
 217                                 *envchanged = 1;
 218                 } else if (!strcmp(cmd, "--work-tree")) {
 219                         if (*argc < 2) {
 220                                 fprintf(stderr, "No directory given for --work-tree.\n");
 221                                 usage(perf_usage_string);
 222                         }
 223                         setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 224                         if (envchanged)
 225                                 *envchanged = 1;
 226                         (*argv)++;
 227                         (*argc)--;
 228                 } else if (!prefixcmp(cmd, CMD_WORK_TREE)) {
 229                         setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1);
 230                         if (envchanged)
 231                                 *envchanged = 1;
 232                 } else if (!strcmp(cmd, "--debugfs-dir")) {
 233                         if (*argc < 2) {
 234                                 fprintf(stderr, "No directory given for --debugfs-dir.\n");
 235                                 usage(perf_usage_string);
 236                         }
 237                         tracing_path_set((*argv)[1]);
 238                         if (envchanged)
 239                                 *envchanged = 1;
 240                         (*argv)++;
 241                         (*argc)--;
 242                 } else if (!strcmp(cmd, "--buildid-dir")) {
 243                         if (*argc < 2) {
 244                                 fprintf(stderr, "No directory given for --buildid-dir.\n");
 245                                 usage(perf_usage_string);
 246                         }
 247                         set_buildid_dir((*argv)[1]);
 248                         if (envchanged)
 249                                 *envchanged = 1;
 250                         (*argv)++;
 251                         (*argc)--;
 252                 } else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
 253                         tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
 254                         fprintf(stderr, "dir: %s\n", tracing_path);
 255                         if (envchanged)
 256                                 *envchanged = 1;
 257                 } else if (!strcmp(cmd, "--list-cmds")) {
 258                         unsigned int i;
 259
 260                         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 261                                 struct cmd_struct *p = commands+i;
 262                                 printf("%s ", p->cmd);
 263                         }
 264                         putchar('\n');
 265                         exit(0);
 266                 } else if (!strcmp(cmd, "--list-opts")) {
 267                         unsigned int i;
 268
 269                         for (i = 0; i < ARRAY_SIZE(options)-1; i++) {
 270                                 struct option *p = options+i;
 271                                 printf("--%s ", p->long_name);
 272                         }
 273                         putchar('\n');
 274                         exit(0);
 275                 } else if (!strcmp(cmd, "--debug")) {
 276                         if (*argc < 2) {
 277                                 fprintf(stderr, "No variable specified for --debug.\n");
 278                                 usage(perf_usage_string);
 279                         }
 280                         if (perf_debug_option((*argv)[1]))
 281                                 usage(perf_usage_string);
 282
 283                         (*argv)++;
 284                         (*argc)--;
 285                 } else {
 286                         fprintf(stderr, "Unknown option: %s\n", cmd);
 287                         usage(perf_usage_string);
 288                 }
 289
 290                 (*argv)++;
 291                 (*argc)--;
 292                 handled++;
 293         }
 294         return handled;
 295 }
 296
 297 static int handle_alias(int *argcp, const char ***argv)
 298 {
 299         int envchanged = 0, ret = 0, saved_errno = errno;
 300         int count, option_count;
 301         const char **new_argv;
 302         const char *alias_command;
 303         char *alias_string;
 304
 305         alias_command = (*argv)[0];
 306         alias_string = alias_lookup(alias_command);
 307         if (alias_string) {
 308                 if (alias_string[0] == '!') {
 309                         if (*argcp > 1) {
 310                                 struct strbuf buf;
 311
 312                                 if (strbuf_init(&buf, PATH_MAX) < 0 ||
 313                                     strbuf_addstr(&buf, alias_string) < 0 ||
 314                                     sq_quote_argv(&buf, (*argv) + 1,
 315                                                   PATH_MAX) < 0)
 316                                         die("Failed to allocate memory.");
 317                                 free(alias_string);
 318                                 alias_string = buf.buf;
 319                         }
 320                         ret = system(alias_string + 1);
 321                         if (ret >= 0 && WIFEXITED(ret) &&
 322                             WEXITSTATUS(ret) != 127)
 323                                 exit(WEXITSTATUS(ret));
 324                         die("Failed to run '%s' when expanding alias '%s'",
 325                             alias_string + 1, alias_command);
 326                 }
 327                 count = split_cmdline(alias_string, &new_argv);
 328                 if (count < 0)
 329                         die("Bad alias.%s string", alias_command);
 330                 option_count = handle_options(&new_argv, &count, &envchanged);
 331                 if (envchanged)
 332                         die("alias '%s' changes environment variables\n"
 333                                  "You can use '!perf' in the alias to do this.",
 334                                  alias_command);
 335                 memmove(new_argv - option_count, new_argv,
 336                                 count * sizeof(char *));
 337                 new_argv -= option_count;
 338
 339                 if (count < 1)
 340                         die("empty alias for %s", alias_command);
 341
 342                 if (!strcmp(alias_command, new_argv[0]))
 343                         die("recursive alias: %s", alias_command);
 344
 345                 new_argv = realloc(new_argv, sizeof(char *) *
 346                                     (count + *argcp + 1));
 347                 /* insert after command name */
 348                 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 349                 new_argv[count + *argcp] = NULL;
 350
 351                 *argv = new_argv;
 352                 *argcp += count - 1;
 353
 354                 ret = 1;
 355         }
 356
 357         errno = saved_errno;
 358
 359         return ret;
 360 }
 361
 362 const char perf_version_string[] = PERF_VERSION;
 363
 364 #define RUN_SETUP       (1<<0)
 365 #define USE_PAGER       (1<<1)
 366 /*
 367  * require working tree to be present -- anything uses this needs
 368  * RUN_SETUP for reading from the configuration file.
 369  */
 370 #define NEED_WORK_TREE  (1<<2)
 371
 372 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 373 {
 374         int status;
 375         struct stat st;
 376         const char *prefix;
 377         char sbuf[STRERR_BUFSIZE];
 378
 379         prefix = NULL;
 380         if (p->option & RUN_SETUP)
 381                 prefix = NULL; /* setup_perf_directory(); */
 382
 383         if (use_browser == -1)
 384                 use_browser = check_browser_config(p->cmd);
 385
 386         if (use_pager == -1 && p->option & RUN_SETUP)
 387                 use_pager = check_pager_config(p->cmd);
 388         if (use_pager == -1 && p->option & USE_PAGER)
 389                 use_pager = 1;
 390         commit_pager_choice();
 391
 392         perf_env__set_cmdline(&perf_env, argc, argv);
 393         status = p->fn(argc, argv, prefix);
 394         exit_browser(status);
 395         perf_env__exit(&perf_env);
 396         bpf__clear();
 397
 398         if (status)
 399                 return status & 0xff;
 400
 401         /* Somebody closed stdout? */
 402         if (fstat(fileno(stdout), &st))
 403                 return 0;
 404         /* Ignore write errors for pipes and sockets.. */
 405         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 406                 return 0;
 407
 408         status = 1;
 409         /* Check for ENOSPC and EIO errors.. */
 410         if (fflush(stdout)) {
 411                 fprintf(stderr, "write failure on standard output: %s",
 412                         strerror_r(errno, sbuf, sizeof(sbuf)));
 413                 goto out;
 414         }
 415         if (ferror(stdout)) {
 416                 fprintf(stderr, "unknown write failure on standard output");
 417                 goto out;
 418         }
 419         if (fclose(stdout)) {
 420                 fprintf(stderr, "close failed on standard output: %s",
 421                         strerror_r(errno, sbuf, sizeof(sbuf)));
 422                 goto out;
 423         }
 424         status = 0;
 425 out:
 426         return status;
 427 }
 428
 429 static void handle_internal_command(int argc, const char **argv)
 430 {
 431         const char *cmd = argv[0];
 432         unsigned int i;
 433         static const char ext[] = STRIP_EXTENSION;
 434
 435         if (sizeof(ext) > 1) {
 436                 i = strlen(argv[0]) - strlen(ext);
 437                 if (i > 0 && !strcmp(argv[0] + i, ext)) {
 438                         char *argv0 = strdup(argv[0]);
 439                         argv[0] = cmd = argv0;
 440                         argv0[i] = '\0';
 441                 }
 442         }
 443
 444         /* Turn "perf cmd --help" into "perf help cmd" */
 445         if (argc > 1 && !strcmp(argv[1], "--help")) {
 446                 argv[1] = argv[0];
 447                 argv[0] = cmd = "help";
 448         }
 449
 450         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 451                 struct cmd_struct *p = commands+i;
 452                 if (strcmp(p->cmd, cmd))
 453                         continue;
 454                 exit(run_builtin(p, argc, argv));
 455         }
 456 }
 457
 458 static void execv_dashed_external(const char **argv)
 459 {
 460         char *cmd;
 461         const char *tmp;
 462         int status;
 463
 464         if (asprintf(&cmd, "perf-%s", argv[0]) < 0)
 465                 goto do_die;
 466
 467         /*
 468          * argv[0] must be the perf command, but the argv array
 469          * belongs to the caller, and may be reused in
 470          * subsequent loop iterations. Save argv[0] and
 471          * restore it on error.
 472          */
 473         tmp = argv[0];
 474         argv[0] = cmd;
 475
 476         /*
 477          * if we fail because the command is not found, it is
 478          * OK to return. Otherwise, we just pass along the status code.
 479          */
 480         status = run_command_v_opt(argv, 0);
 481         if (status != -ERR_RUN_COMMAND_EXEC) {
 482                 if (IS_RUN_COMMAND_ERR(status)) {
 483 do_die:
 484                         die("unable to run '%s'", argv[0]);
 485                 }
 486                 exit(-status);
 487         }
 488         errno = ENOENT; /* as if we called execvp */
 489
 490         argv[0] = tmp;
 491         zfree(&cmd);
 492 }
 493
 494 static int run_argv(int *argcp, const char ***argv)
 495 {
 496         int done_alias = 0;
 497
 498         while (1) {
 499                 /* See if it's an internal command */
 500                 handle_internal_command(*argcp, *argv);
 501
 502                 /* .. then try the external ones */
 503                 execv_dashed_external(*argv);
 504
 505                 /* It could be an alias -- this works around the insanity
 506                  * of overriding "perf log" with "perf show" by having
 507                  * alias.log = show
 508                  */
 509                 if (done_alias || !handle_alias(argcp, argv))
 510                         break;
 511                 done_alias = 1;
 512         }
 513
 514         return done_alias;
 515 }
 516
 517 static void pthread__block_sigwinch(void)
 518 {
 519         sigset_t set;
 520
 521         sigemptyset(&set);
 522         sigaddset(&set, SIGWINCH);
 523         pthread_sigmask(SIG_BLOCK, &set, NULL);
 524 }
 525
 526 void pthread__unblock_sigwinch(void)
 527 {
 528         sigset_t set;
 529
 530         sigemptyset(&set);
 531         sigaddset(&set, SIGWINCH);
 532         pthread_sigmask(SIG_UNBLOCK, &set, NULL);
 533 }
 534
 535 int main(int argc, const char **argv)
 536 {
 537         const char *cmd;
 538         char sbuf[STRERR_BUFSIZE];
 539         int value;
 540
 541         /* libsubcmd init */
 542         exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
 543         pager_init(PERF_PAGER_ENVIRONMENT);
 544
 545         /* The page_size is placed in util object. */
 546         page_size = sysconf(_SC_PAGE_SIZE);
 547         cacheline_size = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
 548
 549         if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
 550                 sysctl_perf_event_max_stack = value;
 551
 552         if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0)
 553                 sysctl_perf_event_max_contexts_per_stack = value;
 554
 555         cmd = extract_argv0_path(argv[0]);
 556         if (!cmd)
 557                 cmd = "perf-help";
 558
 559         srandom(time(NULL));
 560
 561         perf_config(perf_default_config, NULL);
 562         set_buildid_dir(NULL);
 563
 564         /* get debugfs/tracefs mount point from /proc/mounts */
 565         tracing_path_mount();
 566
 567         /*
 568          * "perf-xxxx" is the same as "perf xxxx", but we obviously:
 569          *
 570          *  - cannot take flags in between the "perf" and the "xxxx".
 571          *  - cannot execute it externally (since it would just do
 572          *    the same thing over again)
 573          *
 574          * So we just directly call the internal command handler, and
 575          * die if that one cannot handle it.
 576          */
 577         if (!prefixcmp(cmd, "perf-")) {
 578                 cmd += 5;
 579                 argv[0] = cmd;
 580                 handle_internal_command(argc, argv);
 581                 fprintf(stderr, "cannot handle %s internally", cmd);
 582                 goto out;
 583         }
 584         if (!prefixcmp(cmd, "trace")) {
 585 #ifdef HAVE_LIBAUDIT_SUPPORT
 586                 setup_path();
 587                 argv[0] = "trace";
 588                 return cmd_trace(argc, argv, NULL);
 589 #else
 590                 fprintf(stderr,
 591                         "trace command not available: missing audit-libs devel package at build time.\n");
 592                 goto out;
 593 #endif
 594         }
 595         /* Look for flags.. */
 596         argv++;
 597         argc--;
 598         handle_options(&argv, &argc, NULL);
 599         commit_pager_choice();
 600
 601         if (argc > 0) {
 602                 if (!prefixcmp(argv[0], "--"))
 603                         argv[0] += 2;
 604         } else {
 605                 /* The user didn't specify a command; give them help */
 606                 printf("\n usage: %s\n\n", perf_usage_string);
 607                 list_common_cmds_help();
 608                 printf("\n %s\n\n", perf_more_info_string);
 609                 goto out;
 610         }
 611         cmd = argv[0];
 612
 613         test_attr__init();
 614
 615         /*
 616          * We use PATH to find perf commands, but we prepend some higher
 617          * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
 618          * environment, and the $(perfexecdir) from the Makefile at build
 619          * time.
 620          */
 621         setup_path();
 622         /*
 623          * Block SIGWINCH notifications so that the thread that wants it can
 624          * unblock and get syscalls like select interrupted instead of waiting
 625          * forever while the signal goes to some other non interested thread.
 626          */
 627         pthread__block_sigwinch();
 628
 629         perf_debug_setup();
 630
 631         while (1) {
 632                 static int done_help;
 633                 int was_alias = run_argv(&argc, &argv);
 634
 635                 if (errno != ENOENT)
 636                         break;
 637
 638                 if (was_alias) {
 639                         fprintf(stderr, "Expansion of alias '%s' failed; "
 640                                 "'%s' is not a perf-command\n",
 641                                 cmd, argv[0]);
 642                         goto out;
 643                 }
 644                 if (!done_help) {
 645                         cmd = argv[0] = help_unknown_cmd(cmd);
 646                         done_help = 1;
 647                 } else
 648                         break;
 649         }
 650
 651         fprintf(stderr, "Failed to run command '%s': %s\n",
 652                 cmd, strerror_r(errno, sbuf, sizeof(sbuf)));
 653 out:
 654         return 1;
 655 }