blob: 73d0cac8b67e05900c6b3fb386150db0766fb8ae [file] [log] [blame]
Ingo Molnarbf9e1872009-06-02 23:37:05 +02001/*
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 */
Ingo Molnar07800602009-04-20 15:00:56 +02009#include "builtin.h"
Ingo Molnarbf9e1872009-06-02 23:37:05 +020010
Ingo Molnar148be2c2009-04-27 08:02:14 +020011#include "util/exec_cmd.h"
12#include "util/cache.h"
13#include "util/quote.h"
14#include "util/run-command.h"
Jason Baron5beeded2009-07-21 14:16:29 -040015#include "util/parse-events.h"
Clark Williams549104f2009-11-08 09:03:07 -060016#include "util/debugfs.h"
Ingo Molnar07800602009-04-20 15:00:56 +020017
18const char perf_usage_string[] =
Ingo Molnarcc13a592009-04-20 16:01:30 +020019 "perf [--version] [--help] COMMAND [ARGS]";
Ingo Molnar07800602009-04-20 15:00:56 +020020
21const char perf_more_info_string[] =
22 "See 'perf help COMMAND' for more information on a specific command.";
23
Arnaldo Carvalho de Melo5d06e692010-05-20 22:01:10 -030024int use_browser = -1;
Ingo Molnar07800602009-04-20 15:00:56 +020025static int use_pager = -1;
Arnaldo Carvalho de Melo5d06e692010-05-20 22:01:10 -030026
Ingo Molnar07800602009-04-20 15:00:56 +020027struct pager_config {
28 const char *cmd;
29 int val;
30};
31
Jason Baron5beeded2009-07-21 14:16:29 -040032static char debugfs_mntpt[MAXPATHLEN];
33
Ingo Molnar07800602009-04-20 15:00:56 +020034static int pager_command_config(const char *var, const char *value, void *data)
35{
36 struct pager_config *c = data;
37 if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
38 c->val = perf_config_bool(var, value);
39 return 0;
40}
41
42/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
43int check_pager_config(const char *cmd)
44{
45 struct pager_config c;
46 c.cmd = cmd;
47 c.val = -1;
48 perf_config(pager_command_config, &c);
49 return c.val;
50}
51
Arnaldo Carvalho de Melo5d06e692010-05-20 22:01:10 -030052static int tui_command_config(const char *var, const char *value, void *data)
53{
54 struct pager_config *c = data;
55 if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
56 c->val = perf_config_bool(var, value);
57 return 0;
58}
59
60/* returns 0 for "no tui", 1 for "use tui", and -1 for "not specified" */
61static int check_tui_config(const char *cmd)
62{
63 struct pager_config c;
64 c.cmd = cmd;
65 c.val = -1;
66 perf_config(tui_command_config, &c);
67 return c.val;
68}
69
Thiago Farina4c574152010-01-27 21:05:55 -020070static void commit_pager_choice(void)
71{
Ingo Molnar07800602009-04-20 15:00:56 +020072 switch (use_pager) {
73 case 0:
74 setenv("PERF_PAGER", "cat", 1);
75 break;
76 case 1:
77 /* setup_pager(); */
78 break;
79 default:
80 break;
81 }
82}
83
Jason Baron5beeded2009-07-21 14:16:29 -040084static void set_debugfs_path(void)
85{
86 char *path;
87
88 path = getenv(PERF_DEBUGFS_ENVIRONMENT);
89 snprintf(debugfs_path, MAXPATHLEN, "%s/%s", path ?: debugfs_mntpt,
90 "tracing/events");
91}
92
Thiago Farina4c574152010-01-27 21:05:55 -020093static int handle_options(const char ***argv, int *argc, int *envchanged)
Ingo Molnar07800602009-04-20 15:00:56 +020094{
95 int handled = 0;
96
97 while (*argc > 0) {
98 const char *cmd = (*argv)[0];
99 if (cmd[0] != '-')
100 break;
101
102 /*
103 * For legacy reasons, the "version" and "help"
104 * commands can be written with "--" prepended
105 * to make them look like flags.
106 */
107 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
108 break;
109
110 /*
111 * Check remaining flags.
112 */
Vincent Legollcfed95a2009-10-13 10:18:16 +0200113 if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
114 cmd += strlen(CMD_EXEC_PATH);
Ingo Molnar07800602009-04-20 15:00:56 +0200115 if (*cmd == '=')
116 perf_set_argv_exec_path(cmd + 1);
117 else {
118 puts(perf_exec_path());
119 exit(0);
120 }
121 } else if (!strcmp(cmd, "--html-path")) {
122 puts(system_path(PERF_HTML_PATH));
123 exit(0);
124 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
125 use_pager = 1;
126 } else if (!strcmp(cmd, "--no-pager")) {
127 use_pager = 0;
128 if (envchanged)
129 *envchanged = 1;
130 } else if (!strcmp(cmd, "--perf-dir")) {
131 if (*argc < 2) {
Thiago Farina4c574152010-01-27 21:05:55 -0200132 fprintf(stderr, "No directory given for --perf-dir.\n");
Ingo Molnar07800602009-04-20 15:00:56 +0200133 usage(perf_usage_string);
134 }
135 setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1);
136 if (envchanged)
137 *envchanged = 1;
138 (*argv)++;
139 (*argc)--;
140 handled++;
Vincent Legollcfed95a2009-10-13 10:18:16 +0200141 } else if (!prefixcmp(cmd, CMD_PERF_DIR)) {
142 setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1);
Ingo Molnar07800602009-04-20 15:00:56 +0200143 if (envchanged)
144 *envchanged = 1;
145 } else if (!strcmp(cmd, "--work-tree")) {
146 if (*argc < 2) {
Thiago Farina4c574152010-01-27 21:05:55 -0200147 fprintf(stderr, "No directory given for --work-tree.\n");
Ingo Molnar07800602009-04-20 15:00:56 +0200148 usage(perf_usage_string);
149 }
150 setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
151 if (envchanged)
152 *envchanged = 1;
153 (*argv)++;
154 (*argc)--;
Vincent Legollcfed95a2009-10-13 10:18:16 +0200155 } else if (!prefixcmp(cmd, CMD_WORK_TREE)) {
156 setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1);
Ingo Molnar07800602009-04-20 15:00:56 +0200157 if (envchanged)
158 *envchanged = 1;
Jason Baron5beeded2009-07-21 14:16:29 -0400159 } else if (!strcmp(cmd, "--debugfs-dir")) {
160 if (*argc < 2) {
161 fprintf(stderr, "No directory given for --debugfs-dir.\n");
162 usage(perf_usage_string);
163 }
164 strncpy(debugfs_mntpt, (*argv)[1], MAXPATHLEN);
165 debugfs_mntpt[MAXPATHLEN - 1] = '\0';
166 if (envchanged)
167 *envchanged = 1;
168 (*argv)++;
169 (*argc)--;
Vincent Legollcfed95a2009-10-13 10:18:16 +0200170 } else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
171 strncpy(debugfs_mntpt, cmd + strlen(CMD_DEBUGFS_DIR), MAXPATHLEN);
Jason Baron5beeded2009-07-21 14:16:29 -0400172 debugfs_mntpt[MAXPATHLEN - 1] = '\0';
173 if (envchanged)
174 *envchanged = 1;
Ingo Molnar07800602009-04-20 15:00:56 +0200175 } else {
176 fprintf(stderr, "Unknown option: %s\n", cmd);
177 usage(perf_usage_string);
178 }
179
180 (*argv)++;
181 (*argc)--;
182 handled++;
183 }
184 return handled;
185}
186
187static int handle_alias(int *argcp, const char ***argv)
188{
189 int envchanged = 0, ret = 0, saved_errno = errno;
190 int count, option_count;
Thiago Farina4c574152010-01-27 21:05:55 -0200191 const char **new_argv;
Ingo Molnar07800602009-04-20 15:00:56 +0200192 const char *alias_command;
193 char *alias_string;
Ingo Molnar07800602009-04-20 15:00:56 +0200194
195 alias_command = (*argv)[0];
196 alias_string = alias_lookup(alias_command);
197 if (alias_string) {
198 if (alias_string[0] == '!') {
199 if (*argcp > 1) {
200 struct strbuf buf;
201
202 strbuf_init(&buf, PATH_MAX);
203 strbuf_addstr(&buf, alias_string);
204 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
205 free(alias_string);
206 alias_string = buf.buf;
207 }
208 ret = system(alias_string + 1);
209 if (ret >= 0 && WIFEXITED(ret) &&
210 WEXITSTATUS(ret) != 127)
211 exit(WEXITSTATUS(ret));
212 die("Failed to run '%s' when expanding alias '%s'",
213 alias_string + 1, alias_command);
214 }
215 count = split_cmdline(alias_string, &new_argv);
216 if (count < 0)
217 die("Bad alias.%s string", alias_command);
218 option_count = handle_options(&new_argv, &count, &envchanged);
219 if (envchanged)
220 die("alias '%s' changes environment variables\n"
221 "You can use '!perf' in the alias to do this.",
222 alias_command);
223 memmove(new_argv - option_count, new_argv,
224 count * sizeof(char *));
225 new_argv -= option_count;
226
227 if (count < 1)
228 die("empty alias for %s", alias_command);
229
230 if (!strcmp(alias_command, new_argv[0]))
231 die("recursive alias: %s", alias_command);
232
Thiago Farina4c574152010-01-27 21:05:55 -0200233 new_argv = realloc(new_argv, sizeof(char *) *
Ingo Molnar07800602009-04-20 15:00:56 +0200234 (count + *argcp + 1));
235 /* insert after command name */
Thiago Farina4c574152010-01-27 21:05:55 -0200236 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
237 new_argv[count + *argcp] = NULL;
Ingo Molnar07800602009-04-20 15:00:56 +0200238
239 *argv = new_argv;
240 *argcp += count - 1;
241
242 ret = 1;
243 }
244
245 errno = saved_errno;
246
247 return ret;
248}
249
250const char perf_version_string[] = PERF_VERSION;
251
252#define RUN_SETUP (1<<0)
253#define USE_PAGER (1<<1)
254/*
255 * require working tree to be present -- anything uses this needs
256 * RUN_SETUP for reading from the configuration file.
257 */
258#define NEED_WORK_TREE (1<<2)
259
260struct cmd_struct {
261 const char *cmd;
262 int (*fn)(int, const char **, const char *);
263 int option;
264};
265
266static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
267{
268 int status;
269 struct stat st;
270 const char *prefix;
271
272 prefix = NULL;
273 if (p->option & RUN_SETUP)
274 prefix = NULL; /* setup_perf_directory(); */
275
Arnaldo Carvalho de Melo5d06e692010-05-20 22:01:10 -0300276 if (use_browser == -1)
277 use_browser = check_tui_config(p->cmd);
278
Ingo Molnar07800602009-04-20 15:00:56 +0200279 if (use_pager == -1 && p->option & RUN_SETUP)
280 use_pager = check_pager_config(p->cmd);
281 if (use_pager == -1 && p->option & USE_PAGER)
282 use_pager = 1;
283 commit_pager_choice();
Jason Baron5beeded2009-07-21 14:16:29 -0400284 set_debugfs_path();
Ingo Molnar07800602009-04-20 15:00:56 +0200285
Ingo Molnar07800602009-04-20 15:00:56 +0200286 status = p->fn(argc, argv, prefix);
Arnaldo Carvalho de Melof3a1f0e2010-03-22 13:10:25 -0300287 exit_browser(status);
288
Ingo Molnar07800602009-04-20 15:00:56 +0200289 if (status)
290 return status & 0xff;
291
292 /* Somebody closed stdout? */
293 if (fstat(fileno(stdout), &st))
294 return 0;
295 /* Ignore write errors for pipes and sockets.. */
296 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
297 return 0;
298
299 /* Check for ENOSPC and EIO errors.. */
300 if (fflush(stdout))
301 die("write failure on standard output: %s", strerror(errno));
302 if (ferror(stdout))
303 die("unknown write failure on standard output");
304 if (fclose(stdout))
305 die("close failed on standard output: %s", strerror(errno));
306 return 0;
307}
308
309static void handle_internal_command(int argc, const char **argv)
310{
311 const char *cmd = argv[0];
312 static struct cmd_struct commands[] = {
Arnaldo Carvalho de Meloef12a142010-01-20 15:28:45 -0200313 { "buildid-cache", cmd_buildid_cache, 0 },
Arnaldo Carvalho de Meloc34984b2009-11-16 16:32:45 -0200314 { "buildid-list", cmd_buildid_list, 0 },
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200315 { "diff", cmd_diff, 0 },
Arnaldo Carvalho de Melo43adec92011-03-15 11:04:13 -0300316 { "evlist", cmd_evlist, 0 },
Li Zefanba77c9e2009-11-20 15:53:25 +0800317 { "help", cmd_help, 0 },
318 { "list", cmd_list, 0 },
319 { "record", cmd_record, 0 },
320 { "report", cmd_report, 0 },
321 { "bench", cmd_bench, 0 },
322 { "stat", cmd_stat, 0 },
323 { "timechart", cmd_timechart, 0 },
324 { "top", cmd_top, 0 },
325 { "annotate", cmd_annotate, 0 },
326 { "version", cmd_version, 0 },
Ingo Molnar133dc4c2010-11-16 18:45:39 +0100327 { "script", cmd_script, 0 },
Li Zefanba77c9e2009-11-20 15:53:25 +0800328 { "sched", cmd_sched, 0 },
329 { "probe", cmd_probe, 0 },
330 { "kmem", cmd_kmem, 0 },
Hitoshi Mitake9b5e3502010-01-30 20:43:33 +0900331 { "lock", cmd_lock, 0 },
Zhang, Yanmina1645ce2010-04-19 13:32:50 +0800332 { "kvm", cmd_kvm, 0 },
Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -0300333 { "test", cmd_test, 0 },
Tom Zanussi454c4072010-05-01 01:41:20 -0500334 { "inject", cmd_inject, 0 },
Ingo Molnar07800602009-04-20 15:00:56 +0200335 };
Ingo Molnarf37a2912009-07-01 12:37:06 +0200336 unsigned int i;
Ingo Molnar07800602009-04-20 15:00:56 +0200337 static const char ext[] = STRIP_EXTENSION;
338
339 if (sizeof(ext) > 1) {
340 i = strlen(argv[0]) - strlen(ext);
341 if (i > 0 && !strcmp(argv[0] + i, ext)) {
342 char *argv0 = strdup(argv[0]);
343 argv[0] = cmd = argv0;
344 argv0[i] = '\0';
345 }
346 }
347
348 /* Turn "perf cmd --help" into "perf help cmd" */
349 if (argc > 1 && !strcmp(argv[1], "--help")) {
350 argv[1] = argv[0];
351 argv[0] = cmd = "help";
352 }
353
354 for (i = 0; i < ARRAY_SIZE(commands); i++) {
355 struct cmd_struct *p = commands+i;
356 if (strcmp(p->cmd, cmd))
357 continue;
358 exit(run_builtin(p, argc, argv));
359 }
360}
361
362static void execv_dashed_external(const char **argv)
363{
364 struct strbuf cmd = STRBUF_INIT;
365 const char *tmp;
366 int status;
367
368 strbuf_addf(&cmd, "perf-%s", argv[0]);
369
370 /*
371 * argv[0] must be the perf command, but the argv array
372 * belongs to the caller, and may be reused in
373 * subsequent loop iterations. Save argv[0] and
374 * restore it on error.
375 */
376 tmp = argv[0];
377 argv[0] = cmd.buf;
378
379 /*
380 * if we fail because the command is not found, it is
381 * OK to return. Otherwise, we just pass along the status code.
382 */
383 status = run_command_v_opt(argv, 0);
384 if (status != -ERR_RUN_COMMAND_EXEC) {
385 if (IS_RUN_COMMAND_ERR(status))
386 die("unable to run '%s'", argv[0]);
387 exit(-status);
388 }
389 errno = ENOENT; /* as if we called execvp */
390
391 argv[0] = tmp;
392
393 strbuf_release(&cmd);
394}
395
396static int run_argv(int *argcp, const char ***argv)
397{
398 int done_alias = 0;
399
400 while (1) {
401 /* See if it's an internal command */
402 handle_internal_command(*argcp, *argv);
403
404 /* .. then try the external ones */
405 execv_dashed_external(*argv);
406
407 /* It could be an alias -- this works around the insanity
408 * of overriding "perf log" with "perf show" by having
409 * alias.log = show
410 */
411 if (done_alias || !handle_alias(argcp, argv))
412 break;
413 done_alias = 1;
414 }
415
416 return done_alias;
417}
418
Jason Baron5beeded2009-07-21 14:16:29 -0400419/* mini /proc/mounts parser: searching for "^blah /mount/point debugfs" */
420static void get_debugfs_mntpt(void)
421{
Xiao Guangrong29c52aa2009-12-28 16:47:12 +0800422 const char *path = debugfs_mount(NULL);
Jason Baron5beeded2009-07-21 14:16:29 -0400423
Clark Williams549104f2009-11-08 09:03:07 -0600424 if (path)
425 strncpy(debugfs_mntpt, path, sizeof(debugfs_mntpt));
426 else
427 debugfs_mntpt[0] = '\0';
Jason Baron5beeded2009-07-21 14:16:29 -0400428}
Ingo Molnar07800602009-04-20 15:00:56 +0200429
Arnaldo Carvalho de Melo3af6e332011-10-13 08:52:46 -0300430static void pthread__block_sigwinch(void)
431{
432 sigset_t set;
433
434 sigemptyset(&set);
435 sigaddset(&set, SIGWINCH);
436 pthread_sigmask(SIG_BLOCK, &set, NULL);
437}
438
439void pthread__unblock_sigwinch(void)
440{
441 sigset_t set;
442
443 sigemptyset(&set);
444 sigaddset(&set, SIGWINCH);
445 pthread_sigmask(SIG_UNBLOCK, &set, NULL);
446}
447
Ingo Molnar07800602009-04-20 15:00:56 +0200448int main(int argc, const char **argv)
449{
450 const char *cmd;
451
452 cmd = perf_extract_argv0_path(argv[0]);
453 if (!cmd)
454 cmd = "perf-help";
Jason Baron5beeded2009-07-21 14:16:29 -0400455 /* get debugfs mount point from /proc/mounts */
456 get_debugfs_mntpt();
Ingo Molnar07800602009-04-20 15:00:56 +0200457 /*
458 * "perf-xxxx" is the same as "perf xxxx", but we obviously:
459 *
460 * - cannot take flags in between the "perf" and the "xxxx".
461 * - cannot execute it externally (since it would just do
462 * the same thing over again)
463 *
464 * So we just directly call the internal command handler, and
465 * die if that one cannot handle it.
466 */
467 if (!prefixcmp(cmd, "perf-")) {
Peter Zijlstra266dfb02009-05-25 14:45:24 +0200468 cmd += 5;
Ingo Molnar07800602009-04-20 15:00:56 +0200469 argv[0] = cmd;
470 handle_internal_command(argc, argv);
471 die("cannot handle %s internally", cmd);
472 }
473
474 /* Look for flags.. */
475 argv++;
476 argc--;
477 handle_options(&argv, &argc, NULL);
478 commit_pager_choice();
Jason Baron5beeded2009-07-21 14:16:29 -0400479 set_debugfs_path();
Stephane Eranian45de34b2010-06-01 21:25:01 +0200480 set_buildid_dir();
481
Ingo Molnar07800602009-04-20 15:00:56 +0200482 if (argc > 0) {
483 if (!prefixcmp(argv[0], "--"))
484 argv[0] += 2;
485 } else {
486 /* The user didn't specify a command; give them help */
Ingo Molnar502fc5c2009-03-13 03:20:49 +0100487 printf("\n usage: %s\n\n", perf_usage_string);
Ingo Molnar07800602009-04-20 15:00:56 +0200488 list_common_cmds_help();
Ingo Molnar502fc5c2009-03-13 03:20:49 +0100489 printf("\n %s\n\n", perf_more_info_string);
Ingo Molnar07800602009-04-20 15:00:56 +0200490 exit(1);
491 }
492 cmd = argv[0];
493
494 /*
495 * We use PATH to find perf commands, but we prepend some higher
Uwe Kleine-König659431f2010-01-18 16:02:48 +0100496 * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
Ingo Molnar07800602009-04-20 15:00:56 +0200497 * environment, and the $(perfexecdir) from the Makefile at build
498 * time.
499 */
500 setup_path();
Arnaldo Carvalho de Melo3af6e332011-10-13 08:52:46 -0300501 /*
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();
Ingo Molnar07800602009-04-20 15:00:56 +0200507
508 while (1) {
Thiago Farina4c574152010-01-27 21:05:55 -0200509 static int done_help;
510 static int was_alias;
Ingo Molnar8035e422009-06-06 15:19:13 +0200511
Ingo Molnar07800602009-04-20 15:00:56 +0200512 was_alias = run_argv(&argc, &argv);
513 if (errno != ENOENT)
514 break;
Ingo Molnar8035e422009-06-06 15:19:13 +0200515
Ingo Molnar07800602009-04-20 15:00:56 +0200516 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}