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