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 <subcmd/help.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 static int use_pager = -1;
43 static FILE *debug_fp = NULL;
44
45 struct cmd_struct {
46 const char *cmd;
47 int (*fn)(int, const char **);
48 int option;
49 };
50
51 static struct cmd_struct commands[] = {
52 { "archive", NULL, 0 },
53 { "buildid-cache", cmd_buildid_cache, 0 },
54 { "buildid-list", cmd_buildid_list, 0 },
55 { "check", cmd_check, 0 },
56 { "config", cmd_config, 0 },
57 { "c2c", cmd_c2c, 0 },
58 { "diff", cmd_diff, 0 },
59 { "evlist", cmd_evlist, 0 },
60 { "help", cmd_help, 0 },
61 { "iostat", NULL, 0 },
62 { "kallsyms", cmd_kallsyms, 0 },
63 { "list", cmd_list, 0 },
64 { "record", cmd_record, 0 },
65 { "report", cmd_report, 0 },
66 { "bench", cmd_bench, 0 },
67 { "stat", cmd_stat, 0 },
68 #ifdef HAVE_LIBTRACEEVENT
69 { "timechart", cmd_timechart, 0 },
70 #endif
71 { "top", cmd_top, 0 },
72 { "annotate", cmd_annotate, 0 },
73 { "version", cmd_version, 0 },
74 { "script", cmd_script, 0 },
75 #ifdef HAVE_LIBTRACEEVENT
76 { "sched", cmd_sched, 0 },
77 #endif
78 #ifdef HAVE_LIBELF_SUPPORT
79 { "probe", cmd_probe, 0 },
80 #endif
81 #ifdef HAVE_LIBTRACEEVENT
82 { "kmem", cmd_kmem, 0 },
83 { "lock", cmd_lock, 0 },
84 #endif
85 { "kvm", cmd_kvm, 0 },
86 { "test", cmd_test, 0 },
87 #if defined(HAVE_LIBTRACEEVENT) && (defined(HAVE_LIBAUDIT_SUPPORT) || defined(HAVE_SYSCALL_TABLE_SUPPORT))
88 { "trace", cmd_trace, 0 },
89 #endif
90 { "inject", cmd_inject, 0 },
91 { "mem", cmd_mem, 0 },
92 { "data", cmd_data, 0 },
93 { "ftrace", cmd_ftrace, 0 },
94 { "daemon", cmd_daemon, 0 },
95 #ifdef HAVE_LIBTRACEEVENT
96 { "kwork", cmd_kwork, 0 },
97 #endif
98 };
99
100 struct pager_config {
101 const char *cmd;
102 int val;
103 };
104
same_cmd_with_prefix(const char * var,struct pager_config * c,const char * header)105 static bool same_cmd_with_prefix(const char *var, struct pager_config *c,
106 const char *header)
107 {
108 return (strstarts(var, header) && !strcmp(var + strlen(header), c->cmd));
109 }
110
pager_command_config(const char * var,const char * value,void * data)111 static int pager_command_config(const char *var, const char *value, void *data)
112 {
113 struct pager_config *c = data;
114 if (same_cmd_with_prefix(var, c, "pager."))
115 c->val = perf_config_bool(var, value);
116 return 0;
117 }
118
119 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
check_pager_config(const char * cmd)120 static int check_pager_config(const char *cmd)
121 {
122 int err;
123 struct pager_config c;
124 c.cmd = cmd;
125 c.val = -1;
126 err = perf_config(pager_command_config, &c);
127 return err ?: c.val;
128 }
129
browser_command_config(const char * var,const char * value,void * data)130 static int browser_command_config(const char *var, const char *value, void *data)
131 {
132 struct pager_config *c = data;
133 if (same_cmd_with_prefix(var, c, "tui."))
134 c->val = perf_config_bool(var, value);
135 if (same_cmd_with_prefix(var, c, "gtk."))
136 c->val = perf_config_bool(var, value) ? 2 : 0;
137 return 0;
138 }
139
140 /*
141 * returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
142 * and -1 for "not specified"
143 */
check_browser_config(const char * cmd)144 static int check_browser_config(const char *cmd)
145 {
146 int err;
147 struct pager_config c;
148 c.cmd = cmd;
149 c.val = -1;
150 err = perf_config(browser_command_config, &c);
151 return err ?: c.val;
152 }
153
commit_pager_choice(void)154 static void commit_pager_choice(void)
155 {
156 switch (use_pager) {
157 case 0:
158 setenv(PERF_PAGER_ENVIRONMENT, "cat", 1);
159 break;
160 case 1:
161 /* setup_pager(); */
162 break;
163 default:
164 break;
165 }
166 }
167
set_debug_file(const char * path)168 static int set_debug_file(const char *path)
169 {
170 debug_fp = fopen(path, "w");
171 if (!debug_fp) {
172 fprintf(stderr, "Open debug file '%s' failed: %s\n",
173 path, strerror(errno));
174 return -1;
175 }
176
177 debug_set_file(debug_fp);
178 return 0;
179 }
180
181 struct option options[] = {
182 OPT_ARGUMENT("help", "help"),
183 OPT_ARGUMENT("version", "version"),
184 OPT_ARGUMENT("exec-path", "exec-path"),
185 OPT_ARGUMENT("html-path", "html-path"),
186 OPT_ARGUMENT("paginate", "paginate"),
187 OPT_ARGUMENT("no-pager", "no-pager"),
188 OPT_ARGUMENT("debugfs-dir", "debugfs-dir"),
189 OPT_ARGUMENT("buildid-dir", "buildid-dir"),
190 OPT_ARGUMENT("list-cmds", "list-cmds"),
191 OPT_ARGUMENT("list-opts", "list-opts"),
192 OPT_ARGUMENT("debug", "debug"),
193 OPT_ARGUMENT("debug-file", "debug-file"),
194 OPT_END()
195 };
196
handle_options(const char *** argv,int * argc,int * envchanged)197 static int handle_options(const char ***argv, int *argc, int *envchanged)
198 {
199 int handled = 0;
200
201 while (*argc > 0) {
202 const char *cmd = (*argv)[0];
203 if (cmd[0] != '-')
204 break;
205
206 /*
207 * For legacy reasons, the "version" and "help"
208 * commands can be written with "--" prepended
209 * to make them look like flags.
210 */
211 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
212 break;
213
214 /*
215 * Shortcut for '-h' and '-v' options to invoke help
216 * and version command.
217 */
218 if (!strcmp(cmd, "-h")) {
219 (*argv)[0] = "--help";
220 break;
221 }
222
223 if (!strcmp(cmd, "-v")) {
224 (*argv)[0] = "--version";
225 break;
226 }
227
228 if (!strcmp(cmd, "-vv")) {
229 (*argv)[0] = "version";
230 verbose = 1;
231 break;
232 }
233
234 /*
235 * Check remaining flags.
236 */
237 if (strstarts(cmd, CMD_EXEC_PATH)) {
238 cmd += strlen(CMD_EXEC_PATH);
239 if (*cmd == '=')
240 set_argv_exec_path(cmd + 1);
241 else {
242 puts(get_argv_exec_path());
243 exit(0);
244 }
245 } else if (!strcmp(cmd, "--html-path")) {
246 puts(system_path(PERF_HTML_PATH));
247 exit(0);
248 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
249 use_pager = 1;
250 } else if (!strcmp(cmd, "--no-pager")) {
251 use_pager = 0;
252 if (envchanged)
253 *envchanged = 1;
254 } else if (!strcmp(cmd, "--debugfs-dir")) {
255 if (*argc < 2) {
256 fprintf(stderr, "No directory given for --debugfs-dir.\n");
257 usage(perf_usage_string);
258 }
259 tracing_path_set((*argv)[1]);
260 if (envchanged)
261 *envchanged = 1;
262 (*argv)++;
263 (*argc)--;
264 } else if (!strcmp(cmd, "--buildid-dir")) {
265 if (*argc < 2) {
266 fprintf(stderr, "No directory given for --buildid-dir.\n");
267 usage(perf_usage_string);
268 }
269 set_buildid_dir((*argv)[1]);
270 if (envchanged)
271 *envchanged = 1;
272 (*argv)++;
273 (*argc)--;
274 } else if (strstarts(cmd, CMD_DEBUGFS_DIR)) {
275 tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
276 fprintf(stderr, "dir: %s\n", tracing_path_mount());
277 if (envchanged)
278 *envchanged = 1;
279 } else if (!strcmp(cmd, "--list-cmds")) {
280 unsigned int i;
281
282 for (i = 0; i < ARRAY_SIZE(commands); i++) {
283 struct cmd_struct *p = commands+i;
284 printf("%s ", p->cmd);
285 }
286 putchar('\n');
287 exit(0);
288 } else if (!strcmp(cmd, "--list-opts")) {
289 unsigned int i;
290
291 for (i = 0; i < ARRAY_SIZE(options)-1; i++) {
292 struct option *p = options+i;
293 printf("--%s ", p->long_name);
294 }
295 putchar('\n');
296 exit(0);
297 } else if (!strcmp(cmd, "--debug")) {
298 if (*argc < 2) {
299 fprintf(stderr, "No variable specified for --debug.\n");
300 usage(perf_usage_string);
301 }
302 if (perf_debug_option((*argv)[1]))
303 usage(perf_usage_string);
304
305 (*argv)++;
306 (*argc)--;
307 } else if (!strcmp(cmd, "--debug-file")) {
308 if (*argc < 2) {
309 fprintf(stderr, "No path given for --debug-file.\n");
310 usage(perf_usage_string);
311 }
312
313 if (set_debug_file((*argv)[1]))
314 usage(perf_usage_string);
315
316 (*argv)++;
317 (*argc)--;
318
319 } else {
320 fprintf(stderr, "Unknown option: %s\n", cmd);
321 usage(perf_usage_string);
322 }
323
324 (*argv)++;
325 (*argc)--;
326 handled++;
327 }
328 return handled;
329 }
330
331 #define RUN_SETUP (1<<0)
332 #define USE_PAGER (1<<1)
333
run_builtin(struct cmd_struct * p,int argc,const char ** argv)334 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
335 {
336 int status;
337 struct stat st;
338 char sbuf[STRERR_BUFSIZE];
339
340 if (use_browser == -1)
341 use_browser = check_browser_config(p->cmd);
342
343 if (use_pager == -1 && p->option & RUN_SETUP)
344 use_pager = check_pager_config(p->cmd);
345 if (use_pager == -1 && p->option & USE_PAGER)
346 use_pager = 1;
347 commit_pager_choice();
348
349 perf_env__init(&perf_env);
350 perf_env__set_cmdline(&perf_env, argc, argv);
351 status = p->fn(argc, argv);
352 perf_config__exit();
353 exit_browser(status);
354 perf_env__exit(&perf_env);
355
356 if (status)
357 return status & 0xff;
358
359 /* Somebody closed stdout? */
360 if (fstat(fileno(stdout), &st))
361 return 0;
362 /* Ignore write errors for pipes and sockets.. */
363 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
364 return 0;
365
366 status = 1;
367 /* Check for ENOSPC and EIO errors.. */
368 if (fflush(stdout)) {
369 fprintf(stderr, "write failure on standard output: %s",
370 str_error_r(errno, sbuf, sizeof(sbuf)));
371 goto out;
372 }
373 if (ferror(stdout)) {
374 fprintf(stderr, "unknown write failure on standard output");
375 goto out;
376 }
377 if (fclose(stdout)) {
378 fprintf(stderr, "close failed on standard output: %s",
379 str_error_r(errno, sbuf, sizeof(sbuf)));
380 goto out;
381 }
382 status = 0;
383 out:
384 return status;
385 }
386
handle_internal_command(int argc,const char ** argv)387 static void handle_internal_command(int argc, const char **argv)
388 {
389 const char *cmd = argv[0];
390 unsigned int i;
391
392 /* Turn "perf cmd --help" into "perf help cmd" */
393 if (argc > 1 && !strcmp(argv[1], "--help")) {
394 argv[1] = argv[0];
395 argv[0] = cmd = "help";
396 }
397
398 for (i = 0; i < ARRAY_SIZE(commands); i++) {
399 struct cmd_struct *p = commands+i;
400 if (p->fn == NULL)
401 continue;
402 if (strcmp(p->cmd, cmd))
403 continue;
404 exit(run_builtin(p, argc, argv));
405 }
406 }
407
execv_dashed_external(const char ** argv)408 static void execv_dashed_external(const char **argv)
409 {
410 char *cmd;
411 const char *tmp;
412 int status;
413
414 if (asprintf(&cmd, "perf-%s", argv[0]) < 0)
415 goto do_die;
416
417 /*
418 * argv[0] must be the perf command, but the argv array
419 * belongs to the caller, and may be reused in
420 * subsequent loop iterations. Save argv[0] and
421 * restore it on error.
422 */
423 tmp = argv[0];
424 argv[0] = cmd;
425
426 /*
427 * if we fail because the command is not found, it is
428 * OK to return. Otherwise, we just pass along the status code.
429 */
430 status = run_command_v_opt(argv, 0);
431 if (status != -ERR_RUN_COMMAND_EXEC) {
432 if (IS_RUN_COMMAND_ERR(status)) {
433 do_die:
434 pr_err("FATAL: unable to run '%s'", argv[0]);
435 status = -128;
436 }
437 exit(-status);
438 }
439 errno = ENOENT; /* as if we called execvp */
440
441 argv[0] = tmp;
442 zfree(&cmd);
443 }
444
run_argv(int * argcp,const char *** argv)445 static int run_argv(int *argcp, const char ***argv)
446 {
447 /* See if it's an internal command */
448 handle_internal_command(*argcp, *argv);
449
450 /* .. then try the external ones */
451 execv_dashed_external(*argv);
452 return 0;
453 }
454
libperf_print(enum libperf_print_level level,const char * fmt,va_list ap)455 static int libperf_print(enum libperf_print_level level,
456 const char *fmt, va_list ap)
457 {
458 return veprintf(level, verbose, fmt, ap);
459 }
460
main(int argc,const char ** argv)461 int main(int argc, const char **argv)
462 {
463 int err, done_help = 0;
464 const char *cmd;
465 char sbuf[STRERR_BUFSIZE];
466
467 perf_debug_setup();
468
469 /* libsubcmd init */
470 exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
471 pager_init(PERF_PAGER_ENVIRONMENT);
472
473 libperf_init(libperf_print);
474
475 cmd = extract_argv0_path(argv[0]);
476 if (!cmd)
477 cmd = "perf-help";
478
479 srandom(time(NULL));
480
481 /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
482 config_exclusive_filename = getenv("PERF_CONFIG");
483
484 err = perf_config(perf_default_config, NULL);
485 if (err)
486 return err;
487 set_buildid_dir(NULL);
488
489 /*
490 * "perf-xxxx" is the same as "perf xxxx", but we obviously:
491 *
492 * - cannot take flags in between the "perf" and the "xxxx".
493 * - cannot execute it externally (since it would just do
494 * the same thing over again)
495 *
496 * So we just directly call the internal command handler. If that one
497 * fails to handle this, then maybe we just run a renamed perf binary
498 * that contains a dash in its name. To handle this scenario, we just
499 * fall through and ignore the "xxxx" part of the command string.
500 */
501 if (strstarts(cmd, "perf-")) {
502 cmd += 5;
503 argv[0] = cmd;
504 handle_internal_command(argc, argv);
505 /*
506 * If the command is handled, the above function does not
507 * return undo changes and fall through in such a case.
508 */
509 cmd -= 5;
510 argv[0] = cmd;
511 }
512 if (strstarts(cmd, "trace")) {
513 #ifndef HAVE_LIBTRACEEVENT
514 fprintf(stderr,
515 "trace command not available: missing libtraceevent devel package at build time.\n");
516 goto out;
517 #elif !defined(HAVE_LIBAUDIT_SUPPORT) && !defined(HAVE_SYSCALL_TABLE_SUPPORT)
518 fprintf(stderr,
519 "trace command not available: missing audit-libs devel package at build time.\n");
520 goto out;
521 #else
522 setup_path();
523 argv[0] = "trace";
524 return cmd_trace(argc, argv);
525 #endif
526 }
527 /* Look for flags.. */
528 argv++;
529 argc--;
530 handle_options(&argv, &argc, NULL);
531 commit_pager_choice();
532
533 if (argc > 0) {
534 if (strstarts(argv[0], "--"))
535 argv[0] += 2;
536 } else {
537 /* The user didn't specify a command; give them help */
538 printf("\n usage: %s\n\n", perf_usage_string);
539 list_common_cmds_help();
540 printf("\n %s\n\n", perf_more_info_string);
541 goto out;
542 }
543 cmd = argv[0];
544
545 test_attr__init();
546
547 /*
548 * We use PATH to find perf commands, but we prepend some higher
549 * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
550 * environment, and the $(perfexecdir) from the Makefile at build
551 * time.
552 */
553 setup_path();
554 /*
555 * Block SIGWINCH notifications so that the thread that wants it can
556 * unblock and get syscalls like select interrupted instead of waiting
557 * forever while the signal goes to some other non interested thread.
558 */
559 pthread__block_sigwinch();
560
561 while (1) {
562 run_argv(&argc, &argv);
563
564 if (errno != ENOENT)
565 break;
566
567 if (!done_help) {
568 struct cmdnames main_cmds = {};
569
570 for (unsigned int i = 0; i < ARRAY_SIZE(commands); i++) {
571 add_cmdname(&main_cmds,
572 commands[i].cmd,
573 strlen(commands[i].cmd));
574 }
575 cmd = argv[0] = help_unknown_cmd(cmd, &main_cmds);
576 clean_cmdnames(&main_cmds);
577 done_help = 1;
578 if (!cmd)
579 break;
580 } else
581 break;
582 }
583
584 if (cmd) {
585 fprintf(stderr, "Failed to run command '%s': %s\n",
586 cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
587 }
588 out:
589 if (debug_fp)
590 fclose(debug_fp);
591
592 return 1;
593 }
594