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 #include "perf.h"
  11
  12 #include "util/build-id.h"
  13 #include "util/cache.h"
  14 #include "util/env.h"
  15 #include <subcmd/exec-cmd.h>
  16 #include "util/config.h"
  17 #include <subcmd/run-command.h>
  18 #include "util/parse-events.h"
  19 #include <subcmd/parse-options.h>
  20 #include "util/bpf-loader.h"
  21 #include "util/debug.h"
  22 #include "util/event.h"
  23 #include "util/util.h"
  24 #include "ui/ui.h"
  25 #include "perf-sys.h"
  26 #include <api/fs/fs.h>
  27 #include <api/fs/tracing_path.h>
  28 #include <errno.h>
  29 #include <pthread.h>
  30 #include <signal.h>
  31 #include <stdlib.h>
  32 #include <time.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <unistd.h>
  36 #include <linux/kernel.h>
  37 #include <linux/string.h>
  38 #include <linux/zalloc.h>
  39
  40 const char perf_usage_string[] =
  41         "perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
  42
  43 const char perf_more_info_string[] =
  44         "See 'perf help COMMAND' for more information on a specific command.";
  45
  46 static int use_pager = -1;
  47 const char *input_name;
  48
  49 struct cmd_struct {
  50         const char *cmd;
  51         int (*fn)(int, const char **);
  52         int option;
  53 };
  54
  55 static struct cmd_struct commands[] = {
  56         { "buildid-cache", cmd_buildid_cache, 0 },
  57         { "buildid-list", cmd_buildid_list, 0 },
  58         { "config",     cmd_config,     0 },
  59         { "c2c",        cmd_c2c,        0 },
  60         { "diff",       cmd_diff,       0 },
  61         { "evlist",     cmd_evlist,     0 },
  62         { "help",       cmd_help,       0 },
  63         { "kallsyms",   cmd_kallsyms,   0 },
  64         { "list",       cmd_list,       0 },
  65         { "record",     cmd_record,     0 },
  66         { "report",     cmd_report,     0 },
  67         { "bench",      cmd_bench,      0 },
  68         { "stat",       cmd_stat,       0 },
  69         { "timechart",  cmd_timechart,  0 },
  70         { "top",        cmd_top,        0 },
  71         { "annotate",   cmd_annotate,   0 },
  72         { "version",    cmd_version,    0 },
  73         { "script",     cmd_script,     0 },
  74         { "sched",      cmd_sched,      0 },
  75 #ifdef HAVE_LIBELF_SUPPORT
  76         { "probe",      cmd_probe,      0 },
  77 #endif
  78         { "kmem",       cmd_kmem,       0 },
  79         { "lock",       cmd_lock,       0 },
  80         { "kvm",        cmd_kvm,        0 },
  81         { "test",       cmd_test,       0 },
  82 #if defined(HAVE_LIBAUDIT_SUPPORT) || defined(HAVE_SYSCALL_TABLE_SUPPORT)
  83         { "trace",      cmd_trace,      0 },
  84 #endif
  85         { "inject",     cmd_inject,     0 },
  86         { "mem",        cmd_mem,        0 },
  87         { "data",       cmd_data,       0 },
  88         { "ftrace",     cmd_ftrace,     0 },
  89 };
  90
  91 struct pager_config {
  92         const char *cmd;
  93         int val;
  94 };
  95
  96 static int pager_command_config(const char *var, const char *value, void *data)
  97 {
  98         struct pager_config *c = data;
  99         if (strstarts(var, "pager.") && !strcmp(var + 6, c->cmd))
 100                 c->val = perf_config_bool(var, value);
 101         return 0;
 102 }
 103
 104 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
 105 static int check_pager_config(const char *cmd)
 106 {
 107         int err;
 108         struct pager_config c;
 109         c.cmd = cmd;
 110         c.val = -1;
 111         err = perf_config(pager_command_config, &c);
 112         return err ?: c.val;
 113 }
 114
 115 static int browser_command_config(const char *var, const char *value, void *data)
 116 {
 117         struct pager_config *c = data;
 118         if (strstarts(var, "tui.") && !strcmp(var + 4, c->cmd))
 119                 c->val = perf_config_bool(var, value);
 120         if (strstarts(var, "gtk.") && !strcmp(var + 4, c->cmd))
 121                 c->val = perf_config_bool(var, value) ? 2 : 0;
 122         return 0;
 123 }
 124
 125 /*
 126  * returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
 127  * and -1 for "not specified"
 128  */
 129 static int check_browser_config(const char *cmd)
 130 {
 131         int err;
 132         struct pager_config c;
 133         c.cmd = cmd;
 134         c.val = -1;
 135         err = perf_config(browser_command_config, &c);
 136         return err ?: c.val;
 137 }
 138
 139 static void commit_pager_choice(void)
 140 {
 141         switch (use_pager) {
 142         case 0:
 143                 setenv(PERF_PAGER_ENVIRONMENT, "cat", 1);
 144                 break;
 145         case 1:
 146                 /* setup_pager(); */
 147                 break;
 148         default:
 149                 break;
 150         }
 151 }
 152
 153 struct option options[] = {
 154         OPT_ARGUMENT("help", "help"),
 155         OPT_ARGUMENT("version", "version"),
 156         OPT_ARGUMENT("exec-path", "exec-path"),
 157         OPT_ARGUMENT("html-path", "html-path"),
 158         OPT_ARGUMENT("paginate", "paginate"),
 159         OPT_ARGUMENT("no-pager", "no-pager"),
 160         OPT_ARGUMENT("debugfs-dir", "debugfs-dir"),
 161         OPT_ARGUMENT("buildid-dir", "buildid-dir"),
 162         OPT_ARGUMENT("list-cmds", "list-cmds"),
 163         OPT_ARGUMENT("list-opts", "list-opts"),
 164         OPT_ARGUMENT("debug", "debug"),
 165         OPT_END()
 166 };
 167
 168 static int handle_options(const char ***argv, int *argc, int *envchanged)
 169 {
 170         int handled = 0;
 171
 172         while (*argc > 0) {
 173                 const char *cmd = (*argv)[0];
 174                 if (cmd[0] != '-')
 175                         break;
 176
 177                 /*
 178                  * For legacy reasons, the "version" and "help"
 179                  * commands can be written with "--" prepended
 180                  * to make them look like flags.
 181                  */
 182                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
 183                         break;
 184
 185                 /*
 186                  * Shortcut for '-h' and '-v' options to invoke help
 187                  * and version command.
 188                  */
 189                 if (!strcmp(cmd, "-h")) {
 190                         (*argv)[0] = "--help";
 191                         break;
 192                 }
 193
 194                 if (!strcmp(cmd, "-v")) {
 195                         (*argv)[0] = "--version";
 196                         break;
 197                 }
 198
 199                 if (!strcmp(cmd, "-vv")) {
 200                         (*argv)[0] = "version";
 201                         version_verbose = 1;
 202                         break;
 203                 }
 204
 205                 /*
 206                  * Check remaining flags.
 207                  */
 208                 if (strstarts(cmd, CMD_EXEC_PATH)) {
 209                         cmd += strlen(CMD_EXEC_PATH);
 210                         if (*cmd == '=')
 211                                 set_argv_exec_path(cmd + 1);
 212                         else {
 213                                 puts(get_argv_exec_path());
 214                                 exit(0);
 215                         }
 216                 } else if (!strcmp(cmd, "--html-path")) {
 217                         puts(system_path(PERF_HTML_PATH));
 218                         exit(0);
 219                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
 220                         use_pager = 1;
 221                 } else if (!strcmp(cmd, "--no-pager")) {
 222                         use_pager = 0;
 223                         if (envchanged)
 224                                 *envchanged = 1;
 225                 } else if (!strcmp(cmd, "--debugfs-dir")) {
 226                         if (*argc < 2) {
 227                                 fprintf(stderr, "No directory given for --debugfs-dir.\n");
 228                                 usage(perf_usage_string);
 229                         }
 230                         tracing_path_set((*argv)[1]);
 231                         if (envchanged)
 232                                 *envchanged = 1;
 233                         (*argv)++;
 234                         (*argc)--;
 235                 } else if (!strcmp(cmd, "--buildid-dir")) {
 236                         if (*argc < 2) {
 237                                 fprintf(stderr, "No directory given for --buildid-dir.\n");
 238                                 usage(perf_usage_string);
 239                         }
 240                         set_buildid_dir((*argv)[1]);
 241                         if (envchanged)
 242                                 *envchanged = 1;
 243                         (*argv)++;
 244                         (*argc)--;
 245                 } else if (strstarts(cmd, CMD_DEBUGFS_DIR)) {
 246                         tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
 247                         fprintf(stderr, "dir: %s\n", tracing_path_mount());
 248                         if (envchanged)
 249                                 *envchanged = 1;
 250                 } else if (!strcmp(cmd, "--list-cmds")) {
 251                         unsigned int i;
 252
 253                         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 254                                 struct cmd_struct *p = commands+i;
 255                                 printf("%s ", p->cmd);
 256                         }
 257                         putchar('\n');
 258                         exit(0);
 259                 } else if (!strcmp(cmd, "--list-opts")) {
 260                         unsigned int i;
 261
 262                         for (i = 0; i < ARRAY_SIZE(options)-1; i++) {
 263                                 struct option *p = options+i;
 264                                 printf("--%s ", p->long_name);
 265                         }
 266                         putchar('\n');
 267                         exit(0);
 268                 } else if (!strcmp(cmd, "--debug")) {
 269                         if (*argc < 2) {
 270                                 fprintf(stderr, "No variable specified for --debug.\n");
 271                                 usage(perf_usage_string);
 272                         }
 273                         if (perf_debug_option((*argv)[1]))
 274                                 usage(perf_usage_string);
 275
 276                         (*argv)++;
 277                         (*argc)--;
 278                 } else {
 279                         fprintf(stderr, "Unknown option: %s\n", cmd);
 280                         usage(perf_usage_string);
 281                 }
 282
 283                 (*argv)++;
 284                 (*argc)--;
 285                 handled++;
 286         }
 287         return handled;
 288 }
 289
 290 #define RUN_SETUP       (1<<0)
 291 #define USE_PAGER       (1<<1)
 292
 293 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 294 {
 295         int status;
 296         struct stat st;
 297         char sbuf[STRERR_BUFSIZE];
 298
 299         if (use_browser == -1)
 300                 use_browser = check_browser_config(p->cmd);
 301
 302         if (use_pager == -1 && p->option & RUN_SETUP)
 303                 use_pager = check_pager_config(p->cmd);
 304         if (use_pager == -1 && p->option & USE_PAGER)
 305                 use_pager = 1;
 306         commit_pager_choice();
 307
 308         perf_env__init(&perf_env);
 309         perf_env__set_cmdline(&perf_env, argc, argv);
 310         status = p->fn(argc, argv);
 311         perf_config__exit();
 312         exit_browser(status);
 313         perf_env__exit(&perf_env);
 314         bpf__clear();
 315
 316         if (status)
 317                 return status & 0xff;
 318
 319         /* Somebody closed stdout? */
 320         if (fstat(fileno(stdout), &st))
 321                 return 0;
 322         /* Ignore write errors for pipes and sockets.. */
 323         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 324                 return 0;
 325
 326         status = 1;
 327         /* Check for ENOSPC and EIO errors.. */
 328         if (fflush(stdout)) {
 329                 fprintf(stderr, "write failure on standard output: %s",
 330                         str_error_r(errno, sbuf, sizeof(sbuf)));
 331                 goto out;
 332         }
 333         if (ferror(stdout)) {
 334                 fprintf(stderr, "unknown write failure on standard output");
 335                 goto out;
 336         }
 337         if (fclose(stdout)) {
 338                 fprintf(stderr, "close failed on standard output: %s",
 339                         str_error_r(errno, sbuf, sizeof(sbuf)));
 340                 goto out;
 341         }
 342         status = 0;
 343 out:
 344         return status;
 345 }
 346
 347 static void handle_internal_command(int argc, const char **argv)
 348 {
 349         const char *cmd = argv[0];
 350         unsigned int i;
 351
 352         /* Turn "perf cmd --help" into "perf help cmd" */
 353         if (argc > 1 && !strcmp(argv[1], "--help")) {
 354                 argv[1] = argv[0];
 355                 argv[0] = cmd = "help";
 356         }
 357
 358         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 359                 struct cmd_struct *p = commands+i;
 360                 if (strcmp(p->cmd, cmd))
 361                         continue;
 362                 exit(run_builtin(p, argc, argv));
 363         }
 364 }
 365
 366 static void execv_dashed_external(const char **argv)
 367 {
 368         char *cmd;
 369         const char *tmp;
 370         int status;
 371
 372         if (asprintf(&cmd, "perf-%s", argv[0]) < 0)
 373                 goto do_die;
 374
 375         /*
 376          * argv[0] must be the perf command, but the argv array
 377          * belongs to the caller, and may be reused in
 378          * subsequent loop iterations. Save argv[0] and
 379          * restore it on error.
 380          */
 381         tmp = argv[0];
 382         argv[0] = cmd;
 383
 384         /*
 385          * if we fail because the command is not found, it is
 386          * OK to return. Otherwise, we just pass along the status code.
 387          */
 388         status = run_command_v_opt(argv, 0);
 389         if (status != -ERR_RUN_COMMAND_EXEC) {
 390                 if (IS_RUN_COMMAND_ERR(status)) {
 391 do_die:
 392                         pr_err("FATAL: unable to run '%s'", argv[0]);
 393                         status = -128;
 394                 }
 395                 exit(-status);
 396         }
 397         errno = ENOENT; /* as if we called execvp */
 398
 399         argv[0] = tmp;
 400         zfree(&cmd);
 401 }
 402
 403 static int run_argv(int *argcp, const char ***argv)
 404 {
 405         /* See if it's an internal command */
 406         handle_internal_command(*argcp, *argv);
 407
 408         /* .. then try the external ones */
 409         execv_dashed_external(*argv);
 410         return 0;
 411 }
 412
 413 static void pthread__block_sigwinch(void)
 414 {
 415         sigset_t set;
 416
 417         sigemptyset(&set);
 418         sigaddset(&set, SIGWINCH);
 419         pthread_sigmask(SIG_BLOCK, &set, NULL);
 420 }
 421
 422 void pthread__unblock_sigwinch(void)
 423 {
 424         sigset_t set;
 425
 426         sigemptyset(&set);
 427         sigaddset(&set, SIGWINCH);
 428         pthread_sigmask(SIG_UNBLOCK, &set, NULL);
 429 }
 430
 431 int main(int argc, const char **argv)
 432 {
 433         int err;
 434         const char *cmd;
 435         char sbuf[STRERR_BUFSIZE];
 436
 437         /* libsubcmd init */
 438         exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
 439         pager_init(PERF_PAGER_ENVIRONMENT);
 440
 441         /* The page_size is placed in util object. */
 442         page_size = sysconf(_SC_PAGE_SIZE);
 443
 444         cmd = extract_argv0_path(argv[0]);
 445         if (!cmd)
 446                 cmd = "perf-help";
 447
 448         srandom(time(NULL));
 449
 450         /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
 451         config_exclusive_filename = getenv("PERF_CONFIG");
 452
 453         err = perf_config(perf_default_config, NULL);
 454         if (err)
 455                 return err;
 456         set_buildid_dir(NULL);
 457
 458         /*
 459          * "perf-xxxx" is the same as "perf xxxx", but we obviously:
 460          *
 461          *  - cannot take flags in between the "perf" and the "xxxx".
 462          *  - cannot execute it externally (since it would just do
 463          *    the same thing over again)
 464          *
 465          * So we just directly call the internal command handler. If that one
 466          * fails to handle this, then maybe we just run a renamed perf binary
 467          * that contains a dash in its name. To handle this scenario, we just
 468          * fall through and ignore the "xxxx" part of the command string.
 469          */
 470         if (strstarts(cmd, "perf-")) {
 471                 cmd += 5;
 472                 argv[0] = cmd;
 473                 handle_internal_command(argc, argv);
 474                 /*
 475                  * If the command is handled, the above function does not
 476                  * return undo changes and fall through in such a case.
 477                  */
 478                 cmd -= 5;
 479                 argv[0] = cmd;
 480         }
 481         if (strstarts(cmd, "trace")) {
 482 #if defined(HAVE_LIBAUDIT_SUPPORT) || defined(HAVE_SYSCALL_TABLE_SUPPORT)
 483                 setup_path();
 484                 argv[0] = "trace";
 485                 return cmd_trace(argc, argv);
 486 #else
 487                 fprintf(stderr,
 488                         "trace command not available: missing audit-libs devel package at build time.\n");
 489                 goto out;
 490 #endif
 491         }
 492         /* Look for flags.. */
 493         argv++;
 494         argc--;
 495         handle_options(&argv, &argc, NULL);
 496         commit_pager_choice();
 497
 498         if (argc > 0) {
 499                 if (strstarts(argv[0], "--"))
 500                         argv[0] += 2;
 501         } else {
 502                 /* The user didn't specify a command; give them help */
 503                 printf("\n usage: %s\n\n", perf_usage_string);
 504                 list_common_cmds_help();
 505                 printf("\n %s\n\n", perf_more_info_string);
 506                 goto out;
 507         }
 508         cmd = argv[0];
 509
 510         test_attr__init();
 511
 512         /*
 513          * We use PATH to find perf commands, but we prepend some higher
 514          * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
 515          * environment, and the $(perfexecdir) from the Makefile at build
 516          * time.
 517          */
 518         setup_path();
 519         /*
 520          * Block SIGWINCH notifications so that the thread that wants it can
 521          * unblock and get syscalls like select interrupted instead of waiting
 522          * forever while the signal goes to some other non interested thread.
 523          */
 524         pthread__block_sigwinch();
 525
 526         perf_debug_setup();
 527
 528         while (1) {
 529                 static int done_help;
 530
 531                 run_argv(&argc, &argv);
 532
 533                 if (errno != ENOENT)
 534                         break;
 535
 536                 if (!done_help) {
 537                         cmd = argv[0] = help_unknown_cmd(cmd);
 538                         done_help = 1;
 539                 } else
 540                         break;
 541         }
 542
 543         fprintf(stderr, "Failed to run command '%s': %s\n",
 544                 cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
 545 out:
 546         return 1;
 547 }