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 <internal/lib.h> // page_size 16 #include <subcmd/exec-cmd.h> 17 #include "util/config.h" 18 #include <subcmd/run-command.h> 19 #include "util/parse-events.h" 20 #include <subcmd/parse-options.h> 21 #include "util/bpf-loader.h" 22 #include "util/debug.h" 23 #include "util/event.h" 24 #include "util/util.h" // usage() 25 #include "ui/ui.h" 26 #include "perf-sys.h" 27 #include <api/fs/fs.h> 28 #include <api/fs/tracing_path.h> 29 #include <perf/core.h> 30 #include <errno.h> 31 #include <pthread.h> 32 #include <signal.h> 33 #include <stdlib.h> 34 #include <time.h> 35 #include <sys/types.h> 36 #include <sys/stat.h> 37 #include <unistd.h> 38 #include <linux/kernel.h> 39 #include <linux/string.h> 40 #include <linux/zalloc.h> 41 42 const char perf_usage_string[] = 43 "perf [--version] [--help] [OPTIONS] COMMAND [ARGS]"; 44 45 const char perf_more_info_string[] = 46 "See 'perf help COMMAND' for more information on a specific command."; 47 48 static int use_pager = -1; 49 const char *input_name; 50 51 struct cmd_struct { 52 const char *cmd; 53 int (*fn)(int, const char **); 54 int option; 55 }; 56 57 static struct cmd_struct commands[] = { 58 { "buildid-cache", cmd_buildid_cache, 0 }, 59 { "buildid-list", cmd_buildid_list, 0 }, 60 { "config", cmd_config, 0 }, 61 { "c2c", cmd_c2c, 0 }, 62 { "diff", cmd_diff, 0 }, 63 { "evlist", cmd_evlist, 0 }, 64 { "help", cmd_help, 0 }, 65 { "kallsyms", cmd_kallsyms, 0 }, 66 { "list", cmd_list, 0 }, 67 { "record", cmd_record, 0 }, 68 { "report", cmd_report, 0 }, 69 { "bench", cmd_bench, 0 }, 70 { "stat", cmd_stat, 0 }, 71 { "timechart", cmd_timechart, 0 }, 72 { "top", cmd_top, 0 }, 73 { "annotate", cmd_annotate, 0 }, 74 { "version", cmd_version, 0 }, 75 { "script", cmd_script, 0 }, 76 { "sched", cmd_sched, 0 }, 77 #ifdef HAVE_LIBELF_SUPPORT 78 { "probe", cmd_probe, 0 }, 79 #endif 80 { "kmem", cmd_kmem, 0 }, 81 { "lock", cmd_lock, 0 }, 82 { "kvm", cmd_kvm, 0 }, 83 { "test", cmd_test, 0 }, 84 #if defined(HAVE_LIBAUDIT_SUPPORT) || defined(HAVE_SYSCALL_TABLE_SUPPORT) 85 { "trace", cmd_trace, 0 }, 86 #endif 87 { "inject", cmd_inject, 0 }, 88 { "mem", cmd_mem, 0 }, 89 { "data", cmd_data, 0 }, 90 { "ftrace", cmd_ftrace, 0 }, 91 { "daemon", cmd_daemon, 0 }, 92 }; 93 94 struct pager_config { 95 const char *cmd; 96 int val; 97 }; 98 99 static int pager_command_config(const char *var, const char *value, void *data) 100 { 101 struct pager_config *c = data; 102 if (strstarts(var, "pager.") && !strcmp(var + 6, c->cmd)) 103 c->val = perf_config_bool(var, value); 104 return 0; 105 } 106 107 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ 108 static int check_pager_config(const char *cmd) 109 { 110 int err; 111 struct pager_config c; 112 c.cmd = cmd; 113 c.val = -1; 114 err = perf_config(pager_command_config, &c); 115 return err ?: c.val; 116 } 117 118 static int browser_command_config(const char *var, const char *value, void *data) 119 { 120 struct pager_config *c = data; 121 if (strstarts(var, "tui.") && !strcmp(var + 4, c->cmd)) 122 c->val = perf_config_bool(var, value); 123 if (strstarts(var, "gtk.") && !strcmp(var + 4, c->cmd)) 124 c->val = perf_config_bool(var, value) ? 2 : 0; 125 return 0; 126 } 127 128 /* 129 * returns 0 for "no tui", 1 for "use tui", 2 for "use gtk", 130 * and -1 for "not specified" 131 */ 132 static int check_browser_config(const char *cmd) 133 { 134 int err; 135 struct pager_config c; 136 c.cmd = cmd; 137 c.val = -1; 138 err = perf_config(browser_command_config, &c); 139 return err ?: c.val; 140 } 141 142 static void commit_pager_choice(void) 143 { 144 switch (use_pager) { 145 case 0: 146 setenv(PERF_PAGER_ENVIRONMENT, "cat", 1); 147 break; 148 case 1: 149 /* setup_pager(); */ 150 break; 151 default: 152 break; 153 } 154 } 155 156 struct option options[] = { 157 OPT_ARGUMENT("help", "help"), 158 OPT_ARGUMENT("version", "version"), 159 OPT_ARGUMENT("exec-path", "exec-path"), 160 OPT_ARGUMENT("html-path", "html-path"), 161 OPT_ARGUMENT("paginate", "paginate"), 162 OPT_ARGUMENT("no-pager", "no-pager"), 163 OPT_ARGUMENT("debugfs-dir", "debugfs-dir"), 164 OPT_ARGUMENT("buildid-dir", "buildid-dir"), 165 OPT_ARGUMENT("list-cmds", "list-cmds"), 166 OPT_ARGUMENT("list-opts", "list-opts"), 167 OPT_ARGUMENT("debug", "debug"), 168 OPT_END() 169 }; 170 171 static int handle_options(const char ***argv, int *argc, int *envchanged) 172 { 173 int handled = 0; 174 175 while (*argc > 0) { 176 const char *cmd = (*argv)[0]; 177 if (cmd[0] != '-') 178 break; 179 180 /* 181 * For legacy reasons, the "version" and "help" 182 * commands can be written with "--" prepended 183 * to make them look like flags. 184 */ 185 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version")) 186 break; 187 188 /* 189 * Shortcut for '-h' and '-v' options to invoke help 190 * and version command. 191 */ 192 if (!strcmp(cmd, "-h")) { 193 (*argv)[0] = "--help"; 194 break; 195 } 196 197 if (!strcmp(cmd, "-v")) { 198 (*argv)[0] = "--version"; 199 break; 200 } 201 202 if (!strcmp(cmd, "-vv")) { 203 (*argv)[0] = "version"; 204 version_verbose = 1; 205 break; 206 } 207 208 /* 209 * Check remaining flags. 210 */ 211 if (strstarts(cmd, CMD_EXEC_PATH)) { 212 cmd += strlen(CMD_EXEC_PATH); 213 if (*cmd == '=') 214 set_argv_exec_path(cmd + 1); 215 else { 216 puts(get_argv_exec_path()); 217 exit(0); 218 } 219 } else if (!strcmp(cmd, "--html-path")) { 220 puts(system_path(PERF_HTML_PATH)); 221 exit(0); 222 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) { 223 use_pager = 1; 224 } else if (!strcmp(cmd, "--no-pager")) { 225 use_pager = 0; 226 if (envchanged) 227 *envchanged = 1; 228 } else if (!strcmp(cmd, "--debugfs-dir")) { 229 if (*argc < 2) { 230 fprintf(stderr, "No directory given for --debugfs-dir.\n"); 231 usage(perf_usage_string); 232 } 233 tracing_path_set((*argv)[1]); 234 if (envchanged) 235 *envchanged = 1; 236 (*argv)++; 237 (*argc)--; 238 } else if (!strcmp(cmd, "--buildid-dir")) { 239 if (*argc < 2) { 240 fprintf(stderr, "No directory given for --buildid-dir.\n"); 241 usage(perf_usage_string); 242 } 243 set_buildid_dir((*argv)[1]); 244 if (envchanged) 245 *envchanged = 1; 246 (*argv)++; 247 (*argc)--; 248 } else if (strstarts(cmd, CMD_DEBUGFS_DIR)) { 249 tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR)); 250 fprintf(stderr, "dir: %s\n", tracing_path_mount()); 251 if (envchanged) 252 *envchanged = 1; 253 } else if (!strcmp(cmd, "--list-cmds")) { 254 unsigned int i; 255 256 for (i = 0; i < ARRAY_SIZE(commands); i++) { 257 struct cmd_struct *p = commands+i; 258 printf("%s ", p->cmd); 259 } 260 putchar('\n'); 261 exit(0); 262 } else if (!strcmp(cmd, "--list-opts")) { 263 unsigned int i; 264 265 for (i = 0; i < ARRAY_SIZE(options)-1; i++) { 266 struct option *p = options+i; 267 printf("--%s ", p->long_name); 268 } 269 putchar('\n'); 270 exit(0); 271 } else if (!strcmp(cmd, "--debug")) { 272 if (*argc < 2) { 273 fprintf(stderr, "No variable specified for --debug.\n"); 274 usage(perf_usage_string); 275 } 276 if (perf_debug_option((*argv)[1])) 277 usage(perf_usage_string); 278 279 (*argv)++; 280 (*argc)--; 281 } else { 282 fprintf(stderr, "Unknown option: %s\n", cmd); 283 usage(perf_usage_string); 284 } 285 286 (*argv)++; 287 (*argc)--; 288 handled++; 289 } 290 return handled; 291 } 292 293 #define RUN_SETUP (1<<0) 294 #define USE_PAGER (1<<1) 295 296 static int run_builtin(struct cmd_struct *p, int argc, const char **argv) 297 { 298 int status; 299 struct stat st; 300 char sbuf[STRERR_BUFSIZE]; 301 302 if (use_browser == -1) 303 use_browser = check_browser_config(p->cmd); 304 305 if (use_pager == -1 && p->option & RUN_SETUP) 306 use_pager = check_pager_config(p->cmd); 307 if (use_pager == -1 && p->option & USE_PAGER) 308 use_pager = 1; 309 commit_pager_choice(); 310 311 perf_env__init(&perf_env); 312 perf_env__set_cmdline(&perf_env, argc, argv); 313 status = p->fn(argc, argv); 314 perf_config__exit(); 315 exit_browser(status); 316 perf_env__exit(&perf_env); 317 bpf__clear(); 318 319 if (status) 320 return status & 0xff; 321 322 /* Somebody closed stdout? */ 323 if (fstat(fileno(stdout), &st)) 324 return 0; 325 /* Ignore write errors for pipes and sockets.. */ 326 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) 327 return 0; 328 329 status = 1; 330 /* Check for ENOSPC and EIO errors.. */ 331 if (fflush(stdout)) { 332 fprintf(stderr, "write failure on standard output: %s", 333 str_error_r(errno, sbuf, sizeof(sbuf))); 334 goto out; 335 } 336 if (ferror(stdout)) { 337 fprintf(stderr, "unknown write failure on standard output"); 338 goto out; 339 } 340 if (fclose(stdout)) { 341 fprintf(stderr, "close failed on standard output: %s", 342 str_error_r(errno, sbuf, sizeof(sbuf))); 343 goto out; 344 } 345 status = 0; 346 out: 347 return status; 348 } 349 350 static void handle_internal_command(int argc, const char **argv) 351 { 352 const char *cmd = argv[0]; 353 unsigned int i; 354 355 /* Turn "perf cmd --help" into "perf help cmd" */ 356 if (argc > 1 && !strcmp(argv[1], "--help")) { 357 argv[1] = argv[0]; 358 argv[0] = cmd = "help"; 359 } 360 361 for (i = 0; i < ARRAY_SIZE(commands); i++) { 362 struct cmd_struct *p = commands+i; 363 if (strcmp(p->cmd, cmd)) 364 continue; 365 exit(run_builtin(p, argc, argv)); 366 } 367 } 368 369 static void execv_dashed_external(const char **argv) 370 { 371 char *cmd; 372 const char *tmp; 373 int status; 374 375 if (asprintf(&cmd, "perf-%s", argv[0]) < 0) 376 goto do_die; 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; 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 do_die: 395 pr_err("FATAL: unable to run '%s'", argv[0]); 396 status = -128; 397 } 398 exit(-status); 399 } 400 errno = ENOENT; /* as if we called execvp */ 401 402 argv[0] = tmp; 403 zfree(&cmd); 404 } 405 406 static int run_argv(int *argcp, const char ***argv) 407 { 408 /* See if it's an internal command */ 409 handle_internal_command(*argcp, *argv); 410 411 /* .. then try the external ones */ 412 execv_dashed_external(*argv); 413 return 0; 414 } 415 416 static void pthread__block_sigwinch(void) 417 { 418 sigset_t set; 419 420 sigemptyset(&set); 421 sigaddset(&set, SIGWINCH); 422 pthread_sigmask(SIG_BLOCK, &set, NULL); 423 } 424 425 void pthread__unblock_sigwinch(void) 426 { 427 sigset_t set; 428 429 sigemptyset(&set); 430 sigaddset(&set, SIGWINCH); 431 pthread_sigmask(SIG_UNBLOCK, &set, NULL); 432 } 433 434 static int libperf_print(enum libperf_print_level level, 435 const char *fmt, va_list ap) 436 { 437 return eprintf(level, verbose, fmt, ap); 438 } 439 440 int main(int argc, const char **argv) 441 { 442 int err; 443 const char *cmd; 444 char sbuf[STRERR_BUFSIZE]; 445 446 /* libsubcmd init */ 447 exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT); 448 pager_init(PERF_PAGER_ENVIRONMENT); 449 450 libperf_init(libperf_print); 451 452 cmd = extract_argv0_path(argv[0]); 453 if (!cmd) 454 cmd = "perf-help"; 455 456 srandom(time(NULL)); 457 458 /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */ 459 config_exclusive_filename = getenv("PERF_CONFIG"); 460 461 err = perf_config(perf_default_config, NULL); 462 if (err) 463 return err; 464 set_buildid_dir(NULL); 465 466 /* 467 * "perf-xxxx" is the same as "perf xxxx", but we obviously: 468 * 469 * - cannot take flags in between the "perf" and the "xxxx". 470 * - cannot execute it externally (since it would just do 471 * the same thing over again) 472 * 473 * So we just directly call the internal command handler. If that one 474 * fails to handle this, then maybe we just run a renamed perf binary 475 * that contains a dash in its name. To handle this scenario, we just 476 * fall through and ignore the "xxxx" part of the command string. 477 */ 478 if (strstarts(cmd, "perf-")) { 479 cmd += 5; 480 argv[0] = cmd; 481 handle_internal_command(argc, argv); 482 /* 483 * If the command is handled, the above function does not 484 * return undo changes and fall through in such a case. 485 */ 486 cmd -= 5; 487 argv[0] = cmd; 488 } 489 if (strstarts(cmd, "trace")) { 490 #if defined(HAVE_LIBAUDIT_SUPPORT) || defined(HAVE_SYSCALL_TABLE_SUPPORT) 491 setup_path(); 492 argv[0] = "trace"; 493 return cmd_trace(argc, argv); 494 #else 495 fprintf(stderr, 496 "trace command not available: missing audit-libs devel package at build time.\n"); 497 goto out; 498 #endif 499 } 500 /* Look for flags.. */ 501 argv++; 502 argc--; 503 handle_options(&argv, &argc, NULL); 504 commit_pager_choice(); 505 506 if (argc > 0) { 507 if (strstarts(argv[0], "--")) 508 argv[0] += 2; 509 } else { 510 /* The user didn't specify a command; give them help */ 511 printf("\n usage: %s\n\n", perf_usage_string); 512 list_common_cmds_help(); 513 printf("\n %s\n\n", perf_more_info_string); 514 goto out; 515 } 516 cmd = argv[0]; 517 518 test_attr__init(); 519 520 /* 521 * We use PATH to find perf commands, but we prepend some higher 522 * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH 523 * environment, and the $(perfexecdir) from the Makefile at build 524 * time. 525 */ 526 setup_path(); 527 /* 528 * Block SIGWINCH notifications so that the thread that wants it can 529 * unblock and get syscalls like select interrupted instead of waiting 530 * forever while the signal goes to some other non interested thread. 531 */ 532 pthread__block_sigwinch(); 533 534 perf_debug_setup(); 535 536 while (1) { 537 static int done_help; 538 539 run_argv(&argc, &argv); 540 541 if (errno != ENOENT) 542 break; 543 544 if (!done_help) { 545 cmd = argv[0] = help_unknown_cmd(cmd); 546 done_help = 1; 547 } else 548 break; 549 } 550 551 fprintf(stderr, "Failed to run command '%s': %s\n", 552 cmd, str_error_r(errno, sbuf, sizeof(sbuf))); 553 out: 554 return 1; 555 } 556