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/exec_cmd.h"
  12 #include "util/cache.h"
  13 #include "util/quote.h"
  14 #include "util/run-command.h"
  15 #include "util/parse-events.h"
  16 #include <api/fs/debugfs.h>
  17 #include <pthread.h>
  18
  19 const char perf_usage_string[] =
  20         "perf [--version] [--help] COMMAND [ARGS]";
  21
  22 const char perf_more_info_string[] =
  23         "See 'perf help COMMAND' for more information on a specific command.";
  24
  25 int use_browser = -1;
  26 static int use_pager = -1;
  27 const char *input_name;
  28
  29 struct cmd_struct {
  30         const char *cmd;
  31         int (*fn)(int, const char **, const char *);
  32         int option;
  33 };
  34
  35 static struct cmd_struct commands[] = {
  36         { "buildid-cache", cmd_buildid_cache, 0 },
  37         { "buildid-list", cmd_buildid_list, 0 },
  38         { "diff",       cmd_diff,       0 },
  39         { "evlist",     cmd_evlist,     0 },
  40         { "help",       cmd_help,       0 },
  41         { "list",       cmd_list,       0 },
  42         { "record",     cmd_record,     0 },
  43         { "report",     cmd_report,     0 },
  44         { "bench",      cmd_bench,      0 },
  45         { "stat",       cmd_stat,       0 },
  46         { "timechart",  cmd_timechart,  0 },
  47         { "top",        cmd_top,        0 },
  48         { "annotate",   cmd_annotate,   0 },
  49         { "version",    cmd_version,    0 },
  50         { "script",     cmd_script,     0 },
  51         { "sched",      cmd_sched,      0 },
  52 #ifdef HAVE_LIBELF_SUPPORT
  53         { "probe",      cmd_probe,      0 },
  54 #endif
  55         { "kmem",       cmd_kmem,       0 },
  56         { "lock",       cmd_lock,       0 },
  57         { "kvm",        cmd_kvm,        0 },
  58         { "test",       cmd_test,       0 },
  59 #ifdef HAVE_LIBAUDIT_SUPPORT
  60         { "trace",      cmd_trace,      0 },
  61 #endif
  62         { "inject",     cmd_inject,     0 },
  63         { "mem",        cmd_mem,        0 },
  64 };
  65
  66 struct pager_config {
  67         const char *cmd;
  68         int val;
  69 };
  70
  71 static int pager_command_config(const char *var, const char *value, void *data)
  72 {
  73         struct pager_config *c = data;
  74         if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
  75                 c->val = perf_config_bool(var, value);
  76         return 0;
  77 }
  78
  79 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
  80 int check_pager_config(const char *cmd)
  81 {
  82         struct pager_config c;
  83         c.cmd = cmd;
  84         c.val = -1;
  85         perf_config(pager_command_config, &c);
  86         return c.val;
  87 }
  88
  89 static int browser_command_config(const char *var, const char *value, void *data)
  90 {
  91         struct pager_config *c = data;
  92         if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
  93                 c->val = perf_config_bool(var, value);
  94         if (!prefixcmp(var, "gtk.") && !strcmp(var + 4, c->cmd))
  95                 c->val = perf_config_bool(var, value) ? 2 : 0;
  96         return 0;
  97 }
  98
  99 /*
 100  * returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
 101  * and -1 for "not specified"
 102  */
 103 static int check_browser_config(const char *cmd)
 104 {
 105         struct pager_config c;
 106         c.cmd = cmd;
 107         c.val = -1;
 108         perf_config(browser_command_config, &c);
 109         return c.val;
 110 }
 111
 112 static void commit_pager_choice(void)
 113 {
 114         switch (use_pager) {
 115         case 0:
 116                 setenv("PERF_PAGER", "cat", 1);
 117                 break;
 118         case 1:
 119                 /* setup_pager(); */
 120                 break;
 121         default:
 122                 break;
 123         }
 124 }
 125
 126 static int handle_options(const char ***argv, int *argc, int *envchanged)
 127 {
 128         int handled = 0;
 129
 130         while (*argc > 0) {
 131                 const char *cmd = (*argv)[0];
 132                 if (cmd[0] != '-')
 133                         break;
 134
 135                 /*
 136                  * For legacy reasons, the "version" and "help"
 137                  * commands can be written with "--" prepended
 138                  * to make them look like flags.
 139                  */
 140                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
 141                         break;
 142
 143                 /*
 144                  * Check remaining flags.
 145                  */
 146                 if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
 147                         cmd += strlen(CMD_EXEC_PATH);
 148                         if (*cmd == '=')
 149                                 perf_set_argv_exec_path(cmd + 1);
 150                         else {
 151                                 puts(perf_exec_path());
 152                                 exit(0);
 153                         }
 154                 } else if (!strcmp(cmd, "--html-path")) {
 155                         puts(system_path(PERF_HTML_PATH));
 156                         exit(0);
 157                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
 158                         use_pager = 1;
 159                 } else if (!strcmp(cmd, "--no-pager")) {
 160                         use_pager = 0;
 161                         if (envchanged)
 162                                 *envchanged = 1;
 163                 } else if (!strcmp(cmd, "--perf-dir")) {
 164                         if (*argc < 2) {
 165                                 fprintf(stderr, "No directory given for --perf-dir.\n");
 166                                 usage(perf_usage_string);
 167                         }
 168                         setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1);
 169                         if (envchanged)
 170                                 *envchanged = 1;
 171                         (*argv)++;
 172                         (*argc)--;
 173                         handled++;
 174                 } else if (!prefixcmp(cmd, CMD_PERF_DIR)) {
 175                         setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1);
 176                         if (envchanged)
 177                                 *envchanged = 1;
 178                 } else if (!strcmp(cmd, "--work-tree")) {
 179                         if (*argc < 2) {
 180                                 fprintf(stderr, "No directory given for --work-tree.\n");
 181                                 usage(perf_usage_string);
 182                         }
 183                         setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 184                         if (envchanged)
 185                                 *envchanged = 1;
 186                         (*argv)++;
 187                         (*argc)--;
 188                 } else if (!prefixcmp(cmd, CMD_WORK_TREE)) {
 189                         setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1);
 190                         if (envchanged)
 191                                 *envchanged = 1;
 192                 } else if (!strcmp(cmd, "--debugfs-dir")) {
 193                         if (*argc < 2) {
 194                                 fprintf(stderr, "No directory given for --debugfs-dir.\n");
 195                                 usage(perf_usage_string);
 196                         }
 197                         perf_debugfs_set_path((*argv)[1]);
 198                         if (envchanged)
 199                                 *envchanged = 1;
 200                         (*argv)++;
 201                         (*argc)--;
 202                 } else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
 203                         perf_debugfs_set_path(cmd + strlen(CMD_DEBUGFS_DIR));
 204                         fprintf(stderr, "dir: %s\n", debugfs_mountpoint);
 205                         if (envchanged)
 206                                 *envchanged = 1;
 207                 } else if (!strcmp(cmd, "--list-cmds")) {
 208                         unsigned int i;
 209
 210                         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 211                                 struct cmd_struct *p = commands+i;
 212                                 printf("%s ", p->cmd);
 213                         }
 214                         exit(0);
 215                 } else {
 216                         fprintf(stderr, "Unknown option: %s\n", cmd);
 217                         usage(perf_usage_string);
 218                 }
 219
 220                 (*argv)++;
 221                 (*argc)--;
 222                 handled++;
 223         }
 224         return handled;
 225 }
 226
 227 static int handle_alias(int *argcp, const char ***argv)
 228 {
 229         int envchanged = 0, ret = 0, saved_errno = errno;
 230         int count, option_count;
 231         const char **new_argv;
 232         const char *alias_command;
 233         char *alias_string;
 234
 235         alias_command = (*argv)[0];
 236         alias_string = alias_lookup(alias_command);
 237         if (alias_string) {
 238                 if (alias_string[0] == '!') {
 239                         if (*argcp > 1) {
 240                                 struct strbuf buf;
 241
 242                                 strbuf_init(&buf, PATH_MAX);
 243                                 strbuf_addstr(&buf, alias_string);
 244                                 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
 245                                 free(alias_string);
 246                                 alias_string = buf.buf;
 247                         }
 248                         ret = system(alias_string + 1);
 249                         if (ret >= 0 && WIFEXITED(ret) &&
 250                             WEXITSTATUS(ret) != 127)
 251                                 exit(WEXITSTATUS(ret));
 252                         die("Failed to run '%s' when expanding alias '%s'",
 253                             alias_string + 1, alias_command);
 254                 }
 255                 count = split_cmdline(alias_string, &new_argv);
 256                 if (count < 0)
 257                         die("Bad alias.%s string", alias_command);
 258                 option_count = handle_options(&new_argv, &count, &envchanged);
 259                 if (envchanged)
 260                         die("alias '%s' changes environment variables\n"
 261                                  "You can use '!perf' in the alias to do this.",
 262                                  alias_command);
 263                 memmove(new_argv - option_count, new_argv,
 264                                 count * sizeof(char *));
 265                 new_argv -= option_count;
 266
 267                 if (count < 1)
 268                         die("empty alias for %s", alias_command);
 269
 270                 if (!strcmp(alias_command, new_argv[0]))
 271                         die("recursive alias: %s", alias_command);
 272
 273                 new_argv = realloc(new_argv, sizeof(char *) *
 274                                     (count + *argcp + 1));
 275                 /* insert after command name */
 276                 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 277                 new_argv[count + *argcp] = NULL;
 278
 279                 *argv = new_argv;
 280                 *argcp += count - 1;
 281
 282                 ret = 1;
 283         }
 284
 285         errno = saved_errno;
 286
 287         return ret;
 288 }
 289
 290 const char perf_version_string[] = PERF_VERSION;
 291
 292 #define RUN_SETUP       (1<<0)
 293 #define USE_PAGER       (1<<1)
 294 /*
 295  * require working tree to be present -- anything uses this needs
 296  * RUN_SETUP for reading from the configuration file.
 297  */
 298 #define NEED_WORK_TREE  (1<<2)
 299
 300 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 301 {
 302         int status;
 303         struct stat st;
 304         const char *prefix;
 305
 306         prefix = NULL;
 307         if (p->option & RUN_SETUP)
 308                 prefix = NULL; /* setup_perf_directory(); */
 309
 310         if (use_browser == -1)
 311                 use_browser = check_browser_config(p->cmd);
 312
 313         if (use_pager == -1 && p->option & RUN_SETUP)
 314                 use_pager = check_pager_config(p->cmd);
 315         if (use_pager == -1 && p->option & USE_PAGER)
 316                 use_pager = 1;
 317         commit_pager_choice();
 318
 319         status = p->fn(argc, argv, prefix);
 320         exit_browser(status);
 321
 322         if (status)
 323                 return status & 0xff;
 324
 325         /* Somebody closed stdout? */
 326         if (fstat(fileno(stdout), &st))
 327                 return 0;
 328         /* Ignore write errors for pipes and sockets.. */
 329         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 330                 return 0;
 331
 332         status = 1;
 333         /* Check for ENOSPC and EIO errors.. */
 334         if (fflush(stdout)) {
 335                 fprintf(stderr, "write failure on standard output: %s", strerror(errno));
 336                 goto out;
 337         }
 338         if (ferror(stdout)) {
 339                 fprintf(stderr, "unknown write failure on standard output");
 340                 goto out;
 341         }
 342         if (fclose(stdout)) {
 343                 fprintf(stderr, "close failed on standard output: %s", strerror(errno));
 344                 goto out;
 345         }
 346         status = 0;
 347 out:
 348         return status;
 349 }
 350
 351 static void handle_internal_command(int argc, const char **argv)
 352 {
 353         const char *cmd = argv[0];
 354         unsigned int i;
 355         static const char ext[] = STRIP_EXTENSION;
 356
 357         if (sizeof(ext) > 1) {
 358                 i = strlen(argv[0]) - strlen(ext);
 359                 if (i > 0 && !strcmp(argv[0] + i, ext)) {
 360                         char *argv0 = strdup(argv[0]);
 361                         argv[0] = cmd = argv0;
 362                         argv0[i] = '\0';
 363                 }
 364         }
 365
 366         /* Turn "perf cmd --help" into "perf help cmd" */
 367         if (argc > 1 && !strcmp(argv[1], "--help")) {
 368                 argv[1] = argv[0];
 369                 argv[0] = cmd = "help";
 370         }
 371
 372         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 373                 struct cmd_struct *p = commands+i;
 374                 if (strcmp(p->cmd, cmd))
 375                         continue;
 376                 exit(run_builtin(p, argc, argv));
 377         }
 378 }
 379
 380 static void execv_dashed_external(const char **argv)
 381 {
 382         struct strbuf cmd = STRBUF_INIT;
 383         const char *tmp;
 384         int status;
 385
 386         strbuf_addf(&cmd, "perf-%s", argv[0]);
 387
 388         /*
 389          * argv[0] must be the perf command, but the argv array
 390          * belongs to the caller, and may be reused in
 391          * subsequent loop iterations. Save argv[0] and
 392          * restore it on error.
 393          */
 394         tmp = argv[0];
 395         argv[0] = cmd.buf;
 396
 397         /*
 398          * if we fail because the command is not found, it is
 399          * OK to return. Otherwise, we just pass along the status code.
 400          */
 401         status = run_command_v_opt(argv, 0);
 402         if (status != -ERR_RUN_COMMAND_EXEC) {
 403                 if (IS_RUN_COMMAND_ERR(status))
 404                         die("unable to run '%s'", argv[0]);
 405                 exit(-status);
 406         }
 407         errno = ENOENT; /* as if we called execvp */
 408
 409         argv[0] = tmp;
 410
 411         strbuf_release(&cmd);
 412 }
 413
 414 static int run_argv(int *argcp, const char ***argv)
 415 {
 416         int done_alias = 0;
 417
 418         while (1) {
 419                 /* See if it's an internal command */
 420                 handle_internal_command(*argcp, *argv);
 421
 422                 /* .. then try the external ones */
 423                 execv_dashed_external(*argv);
 424
 425                 /* It could be an alias -- this works around the insanity
 426                  * of overriding "perf log" with "perf show" by having
 427                  * alias.log = show
 428                  */
 429                 if (done_alias || !handle_alias(argcp, argv))
 430                         break;
 431                 done_alias = 1;
 432         }
 433
 434         return done_alias;
 435 }
 436
 437 static void pthread__block_sigwinch(void)
 438 {
 439         sigset_t set;
 440
 441         sigemptyset(&set);
 442         sigaddset(&set, SIGWINCH);
 443         pthread_sigmask(SIG_BLOCK, &set, NULL);
 444 }
 445
 446 void pthread__unblock_sigwinch(void)
 447 {
 448         sigset_t set;
 449
 450         sigemptyset(&set);
 451         sigaddset(&set, SIGWINCH);
 452         pthread_sigmask(SIG_UNBLOCK, &set, NULL);
 453 }
 454
 455 int main(int argc, const char **argv)
 456 {
 457         const char *cmd;
 458
 459         /* The page_size is placed in util object. */
 460         page_size = sysconf(_SC_PAGE_SIZE);
 461
 462         cmd = perf_extract_argv0_path(argv[0]);
 463         if (!cmd)
 464                 cmd = "perf-help";
 465         /* get debugfs mount point from /proc/mounts */
 466         perf_debugfs_mount(NULL);
 467         /*
 468          * "perf-xxxx" is the same as "perf xxxx", but we obviously:
 469          *
 470          *  - cannot take flags in between the "perf" and the "xxxx".
 471          *  - cannot execute it externally (since it would just do
 472          *    the same thing over again)
 473          *
 474          * So we just directly call the internal command handler, and
 475          * die if that one cannot handle it.
 476          */
 477         if (!prefixcmp(cmd, "perf-")) {
 478                 cmd += 5;
 479                 argv[0] = cmd;
 480                 handle_internal_command(argc, argv);
 481                 fprintf(stderr, "cannot handle %s internally", cmd);
 482                 goto out;
 483         }
 484 #ifdef HAVE_LIBAUDIT_SUPPORT
 485         if (!prefixcmp(cmd, "trace")) {
 486                 set_buildid_dir();
 487                 setup_path();
 488                 argv[0] = "trace";
 489                 return cmd_trace(argc, argv, NULL);
 490         }
 491 #endif
 492         /* Look for flags.. */
 493         argv++;
 494         argc--;
 495         handle_options(&argv, &argc, NULL);
 496         commit_pager_choice();
 497         set_buildid_dir();
 498
 499         if (argc > 0) {
 500                 if (!prefixcmp(argv[0], "--"))
 501                         argv[0] += 2;
 502         } else {
 503                 /* The user didn't specify a command; give them help */
 504                 printf("\n usage: %s\n\n", perf_usage_string);
 505                 list_common_cmds_help();
 506                 printf("\n %s\n\n", perf_more_info_string);
 507                 goto out;
 508         }
 509         cmd = argv[0];
 510
 511         test_attr__init();
 512
 513         /*
 514          * We use PATH to find perf commands, but we prepend some higher
 515          * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
 516          * environment, and the $(perfexecdir) from the Makefile at build
 517          * time.
 518          */
 519         setup_path();
 520         /*
 521          * Block SIGWINCH notifications so that the thread that wants it can
 522          * unblock and get syscalls like select interrupted instead of waiting
 523          * forever while the signal goes to some other non interested thread.
 524          */
 525         pthread__block_sigwinch();
 526
 527         while (1) {
 528                 static int done_help;
 529                 int was_alias = run_argv(&argc, &argv);
 530
 531                 if (errno != ENOENT)
 532                         break;
 533
 534                 if (was_alias) {
 535                         fprintf(stderr, "Expansion of alias '%s' failed; "
 536                                 "'%s' is not a perf-command\n",
 537                                 cmd, argv[0]);
 538                         goto out;
 539                 }
 540                 if (!done_help) {
 541                         cmd = argv[0] = help_unknown_cmd(cmd);
 542                         done_help = 1;
 543                 } else
 544                         break;
 545         }
 546
 547         fprintf(stderr, "Failed to run command '%s': %s\n",
 548                 cmd, strerror(errno));
 549 out:
 550         return 1;
 551 }