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ARM: pmu: add support for interrupt-affinity property
[linux/fpc-iii.git] / tools / perf / perf.c
blob3700a7faca6cf4df09be10ebc0b98376b10e84b6
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/debug.h"
17 #include <api/fs/debugfs.h>
18 #include <pthread.h>
19
20 const char perf_usage_string[] =
21 "perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
22
23 const char perf_more_info_string[] =
24 "See 'perf help COMMAND' for more information on a specific command.";
25
26 int use_browser = -1;
27 static int use_pager = -1;
28 const char *input_name;
29
30 struct cmd_struct {
31 const char *cmd;
32 int (*fn)(int, const char **, const char *);
33 int option;
34 };
35
36 static struct cmd_struct commands[] = {
37 { "buildid-cache", cmd_buildid_cache, 0 },
38 { "buildid-list", cmd_buildid_list, 0 },
39 { "diff", cmd_diff, 0 },
40 { "evlist", cmd_evlist, 0 },
41 { "help", cmd_help, 0 },
42 { "list", cmd_list, 0 },
43 { "record", cmd_record, 0 },
44 { "report", cmd_report, 0 },
45 { "bench", cmd_bench, 0 },
46 { "stat", cmd_stat, 0 },
47 { "timechart", cmd_timechart, 0 },
48 { "top", cmd_top, 0 },
49 { "annotate", cmd_annotate, 0 },
50 { "version", cmd_version, 0 },
51 { "script", cmd_script, 0 },
52 { "sched", cmd_sched, 0 },
53 #ifdef HAVE_LIBELF_SUPPORT
54 { "probe", cmd_probe, 0 },
55 #endif
56 { "kmem", cmd_kmem, 0 },
57 { "lock", cmd_lock, 0 },
58 { "kvm", cmd_kvm, 0 },
59 { "test", cmd_test, 0 },
60 #ifdef HAVE_LIBAUDIT_SUPPORT
61 { "trace", cmd_trace, 0 },
62 #endif
63 { "inject", cmd_inject, 0 },
64 { "mem", cmd_mem, 0 },
65 };
66
67 struct pager_config {
68 const char *cmd;
69 int val;
70 };
71
72 static int pager_command_config(const char *var, const char *value, void *data)
73 {
74 struct pager_config *c = data;
75 if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
76 c->val = perf_config_bool(var, value);
77 return 0;
78 }
79
80 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
81 int check_pager_config(const char *cmd)
82 {
83 struct pager_config c;
84 c.cmd = cmd;
85 c.val = -1;
86 perf_config(pager_command_config, &c);
87 return c.val;
88 }
89
90 static int browser_command_config(const char *var, const char *value, void *data)
91 {
92 struct pager_config *c = data;
93 if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
94 c->val = perf_config_bool(var, value);
95 if (!prefixcmp(var, "gtk.") && !strcmp(var + 4, c->cmd))
96 c->val = perf_config_bool(var, value) ? 2 : 0;
97 return 0;
98 }
99
100 /*
101 * returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
102 * and -1 for "not specified"
103 */
104 static int check_browser_config(const char *cmd)
105 {
106 struct pager_config c;
107 c.cmd = cmd;
108 c.val = -1;
109 perf_config(browser_command_config, &c);
110 return c.val;
111 }
112
113 static void commit_pager_choice(void)
114 {
115 switch (use_pager) {
116 case 0:
117 setenv("PERF_PAGER", "cat", 1);
118 break;
119 case 1:
120 /* setup_pager(); */
121 break;
122 default:
123 break;
124 }
125 }
126
127 static int handle_options(const char ***argv, int *argc, int *envchanged)
128 {
129 int handled = 0;
130
131 while (*argc > 0) {
132 const char *cmd = (*argv)[0];
133 if (cmd[0] != '-')
134 break;
135
136 /*
137 * For legacy reasons, the "version" and "help"
138 * commands can be written with "--" prepended
139 * to make them look like flags.
140 */
141 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
142 break;
143
144 /*
145 * Check remaining flags.
146 */
147 if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
148 cmd += strlen(CMD_EXEC_PATH);
149 if (*cmd == '=')
150 perf_set_argv_exec_path(cmd + 1);
151 else {
152 puts(perf_exec_path());
153 exit(0);
154 }
155 } else if (!strcmp(cmd, "--html-path")) {
156 puts(system_path(PERF_HTML_PATH));
157 exit(0);
158 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
159 use_pager = 1;
160 } else if (!strcmp(cmd, "--no-pager")) {
161 use_pager = 0;
162 if (envchanged)
163 *envchanged = 1;
164 } else if (!strcmp(cmd, "--perf-dir")) {
165 if (*argc < 2) {
166 fprintf(stderr, "No directory given for --perf-dir.\n");
167 usage(perf_usage_string);
168 }
169 setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1);
170 if (envchanged)
171 *envchanged = 1;
172 (*argv)++;
173 (*argc)--;
174 handled++;
175 } else if (!prefixcmp(cmd, CMD_PERF_DIR)) {
176 setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1);
177 if (envchanged)
178 *envchanged = 1;
179 } else if (!strcmp(cmd, "--work-tree")) {
180 if (*argc < 2) {
181 fprintf(stderr, "No directory given for --work-tree.\n");
182 usage(perf_usage_string);
183 }
184 setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
185 if (envchanged)
186 *envchanged = 1;
187 (*argv)++;
188 (*argc)--;
189 } else if (!prefixcmp(cmd, CMD_WORK_TREE)) {
190 setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1);
191 if (envchanged)
192 *envchanged = 1;
193 } else if (!strcmp(cmd, "--debugfs-dir")) {
194 if (*argc < 2) {
195 fprintf(stderr, "No directory given for --debugfs-dir.\n");
196 usage(perf_usage_string);
197 }
198 perf_debugfs_set_path((*argv)[1]);
199 if (envchanged)
200 *envchanged = 1;
201 (*argv)++;
202 (*argc)--;
203 } else if (!strcmp(cmd, "--buildid-dir")) {
204 if (*argc < 2) {
205 fprintf(stderr, "No directory given for --buildid-dir.\n");
206 usage(perf_usage_string);
207 }
208 set_buildid_dir((*argv)[1]);
209 if (envchanged)
210 *envchanged = 1;
211 (*argv)++;
212 (*argc)--;
213 } else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
214 perf_debugfs_set_path(cmd + strlen(CMD_DEBUGFS_DIR));
215 fprintf(stderr, "dir: %s\n", debugfs_mountpoint);
216 if (envchanged)
217 *envchanged = 1;
218 } else if (!strcmp(cmd, "--list-cmds")) {
219 unsigned int i;
220
221 for (i = 0; i < ARRAY_SIZE(commands); i++) {
222 struct cmd_struct *p = commands+i;
223 printf("%s ", p->cmd);
224 }
225 exit(0);
226 } else if (!strcmp(cmd, "--debug")) {
227 if (*argc < 2) {
228 fprintf(stderr, "No variable specified for --debug.\n");
229 usage(perf_usage_string);
230 }
231 if (perf_debug_option((*argv)[1]))
232 usage(perf_usage_string);
233
234 (*argv)++;
235 (*argc)--;
236 } else {
237 fprintf(stderr, "Unknown option: %s\n", cmd);
238 usage(perf_usage_string);
239 }
240
241 (*argv)++;
242 (*argc)--;
243 handled++;
244 }
245 return handled;
246 }
247
248 static int handle_alias(int *argcp, const char ***argv)
249 {
250 int envchanged = 0, ret = 0, saved_errno = errno;
251 int count, option_count;
252 const char **new_argv;
253 const char *alias_command;
254 char *alias_string;
255
256 alias_command = (*argv)[0];
257 alias_string = alias_lookup(alias_command);
258 if (alias_string) {
259 if (alias_string[0] == '!') {
260 if (*argcp > 1) {
261 struct strbuf buf;
262
263 strbuf_init(&buf, PATH_MAX);
264 strbuf_addstr(&buf, alias_string);
265 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
266 free(alias_string);
267 alias_string = buf.buf;
268 }
269 ret = system(alias_string + 1);
270 if (ret >= 0 && WIFEXITED(ret) &&
271 WEXITSTATUS(ret) != 127)
272 exit(WEXITSTATUS(ret));
273 die("Failed to run '%s' when expanding alias '%s'",
274 alias_string + 1, alias_command);
275 }
276 count = split_cmdline(alias_string, &new_argv);
277 if (count < 0)
278 die("Bad alias.%s string", alias_command);
279 option_count = handle_options(&new_argv, &count, &envchanged);
280 if (envchanged)
281 die("alias '%s' changes environment variables\n"
282 "You can use '!perf' in the alias to do this.",
283 alias_command);
284 memmove(new_argv - option_count, new_argv,
285 count * sizeof(char *));
286 new_argv -= option_count;
287
288 if (count < 1)
289 die("empty alias for %s", alias_command);
290
291 if (!strcmp(alias_command, new_argv[0]))
292 die("recursive alias: %s", alias_command);
293
294 new_argv = realloc(new_argv, sizeof(char *) *
295 (count + *argcp + 1));
296 /* insert after command name */
297 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
298 new_argv[count + *argcp] = NULL;
299
300 *argv = new_argv;
301 *argcp += count - 1;
302
303 ret = 1;
304 }
305
306 errno = saved_errno;
307
308 return ret;
309 }
310
311 const char perf_version_string[] = PERF_VERSION;
312
313 #define RUN_SETUP (1<<0)
314 #define USE_PAGER (1<<1)
315 /*
316 * require working tree to be present -- anything uses this needs
317 * RUN_SETUP for reading from the configuration file.
318 */
319 #define NEED_WORK_TREE (1<<2)
320
321 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
322 {
323 int status;
324 struct stat st;
325 const char *prefix;
326 char sbuf[STRERR_BUFSIZE];
327
328 prefix = NULL;
329 if (p->option & RUN_SETUP)
330 prefix = NULL; /* setup_perf_directory(); */
331
332 if (use_browser == -1)
333 use_browser = check_browser_config(p->cmd);
334
335 if (use_pager == -1 && p->option & RUN_SETUP)
336 use_pager = check_pager_config(p->cmd);
337 if (use_pager == -1 && p->option & USE_PAGER)
338 use_pager = 1;
339 commit_pager_choice();
340
341 status = p->fn(argc, argv, prefix);
342 exit_browser(status);
343
344 if (status)
345 return status & 0xff;
346
347 /* Somebody closed stdout? */
348 if (fstat(fileno(stdout), &st))
349 return 0;
350 /* Ignore write errors for pipes and sockets.. */
351 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
352 return 0;
353
354 status = 1;
355 /* Check for ENOSPC and EIO errors.. */
356 if (fflush(stdout)) {
357 fprintf(stderr, "write failure on standard output: %s",
358 strerror_r(errno, sbuf, sizeof(sbuf)));
359 goto out;
360 }
361 if (ferror(stdout)) {
362 fprintf(stderr, "unknown write failure on standard output");
363 goto out;
364 }
365 if (fclose(stdout)) {
366 fprintf(stderr, "close failed on standard output: %s",
367 strerror_r(errno, sbuf, sizeof(sbuf)));
368 goto out;
369 }
370 status = 0;
371 out:
372 return status;
373 }
374
375 static void handle_internal_command(int argc, const char **argv)
376 {
377 const char *cmd = argv[0];
378 unsigned int i;
379 static const char ext[] = STRIP_EXTENSION;
380
381 if (sizeof(ext) > 1) {
382 i = strlen(argv[0]) - strlen(ext);
383 if (i > 0 && !strcmp(argv[0] + i, ext)) {
384 char *argv0 = strdup(argv[0]);
385 argv[0] = cmd = argv0;
386 argv0[i] = '\0';
387 }
388 }
389
390 /* Turn "perf cmd --help" into "perf help cmd" */
391 if (argc > 1 && !strcmp(argv[1], "--help")) {
392 argv[1] = argv[0];
393 argv[0] = cmd = "help";
394 }
395
396 for (i = 0; i < ARRAY_SIZE(commands); i++) {
397 struct cmd_struct *p = commands+i;
398 if (strcmp(p->cmd, cmd))
399 continue;
400 exit(run_builtin(p, argc, argv));
401 }
402 }
403
404 static void execv_dashed_external(const char **argv)
405 {
406 struct strbuf cmd = STRBUF_INIT;
407 const char *tmp;
408 int status;
409
410 strbuf_addf(&cmd, "perf-%s", argv[0]);
411
412 /*
413 * argv[0] must be the perf command, but the argv array
414 * belongs to the caller, and may be reused in
415 * subsequent loop iterations. Save argv[0] and
416 * restore it on error.
417 */
418 tmp = argv[0];
419 argv[0] = cmd.buf;
420
421 /*
422 * if we fail because the command is not found, it is
423 * OK to return. Otherwise, we just pass along the status code.
424 */
425 status = run_command_v_opt(argv, 0);
426 if (status != -ERR_RUN_COMMAND_EXEC) {
427 if (IS_RUN_COMMAND_ERR(status))
428 die("unable to run '%s'", argv[0]);
429 exit(-status);
430 }
431 errno = ENOENT; /* as if we called execvp */
432
433 argv[0] = tmp;
434
435 strbuf_release(&cmd);
436 }
437
438 static int run_argv(int *argcp, const char ***argv)
439 {
440 int done_alias = 0;
441
442 while (1) {
443 /* See if it's an internal command */
444 handle_internal_command(*argcp, *argv);
445
446 /* .. then try the external ones */
447 execv_dashed_external(*argv);
448
449 /* It could be an alias -- this works around the insanity
450 * of overriding "perf log" with "perf show" by having
451 * alias.log = show
452 */
453 if (done_alias || !handle_alias(argcp, argv))
454 break;
455 done_alias = 1;
456 }
457
458 return done_alias;
459 }
460
461 static void pthread__block_sigwinch(void)
462 {
463 sigset_t set;
464
465 sigemptyset(&set);
466 sigaddset(&set, SIGWINCH);
467 pthread_sigmask(SIG_BLOCK, &set, NULL);
468 }
469
470 void pthread__unblock_sigwinch(void)
471 {
472 sigset_t set;
473
474 sigemptyset(&set);
475 sigaddset(&set, SIGWINCH);
476 pthread_sigmask(SIG_UNBLOCK, &set, NULL);
477 }
478
479 int main(int argc, const char **argv)
480 {
481 const char *cmd;
482 char sbuf[STRERR_BUFSIZE];
483
484 /* The page_size is placed in util object. */
485 page_size = sysconf(_SC_PAGE_SIZE);
486 cacheline_size = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
487
488 cmd = perf_extract_argv0_path(argv[0]);
489 if (!cmd)
490 cmd = "perf-help";
491 /* get debugfs mount point from /proc/mounts */
492 perf_debugfs_mount(NULL);
493 /*
494 * "perf-xxxx" is the same as "perf xxxx", but we obviously:
495 *
496 * - cannot take flags in between the "perf" and the "xxxx".
497 * - cannot execute it externally (since it would just do
498 * the same thing over again)
499 *
500 * So we just directly call the internal command handler, and
501 * die if that one cannot handle it.
502 */
503 if (!prefixcmp(cmd, "perf-")) {
504 cmd += 5;
505 argv[0] = cmd;
506 handle_internal_command(argc, argv);
507 fprintf(stderr, "cannot handle %s internally", cmd);
508 goto out;
509 }
510 if (!prefixcmp(cmd, "trace")) {
511 #ifdef HAVE_LIBAUDIT_SUPPORT
512 set_buildid_dir(NULL);
513 setup_path();
514 argv[0] = "trace";
515 return cmd_trace(argc, argv, NULL);
516 #else
517 fprintf(stderr,
518 "trace command not available: missing audit-libs devel package at build time.\n");
519 goto out;
520 #endif
521 }
522 /* Look for flags.. */
523 argv++;
524 argc--;
525 handle_options(&argv, &argc, NULL);
526 commit_pager_choice();
527 set_buildid_dir(NULL);
528
529 if (argc > 0) {
530 if (!prefixcmp(argv[0], "--"))
531 argv[0] += 2;
532 } else {
533 /* The user didn't specify a command; give them help */
534 printf("\n usage: %s\n\n", perf_usage_string);
535 list_common_cmds_help();
536 printf("\n %s\n\n", perf_more_info_string);
537 goto out;
538 }
539 cmd = argv[0];
540
541 test_attr__init();
542
543 /*
544 * We use PATH to find perf commands, but we prepend some higher
545 * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
546 * environment, and the $(perfexecdir) from the Makefile at build
547 * time.
548 */
549 setup_path();
550 /*
551 * Block SIGWINCH notifications so that the thread that wants it can
552 * unblock and get syscalls like select interrupted instead of waiting
553 * forever while the signal goes to some other non interested thread.
554 */
555 pthread__block_sigwinch();
556
557 while (1) {
558 static int done_help;
559 int was_alias = run_argv(&argc, &argv);
560
561 if (errno != ENOENT)
562 break;
563
564 if (was_alias) {
565 fprintf(stderr, "Expansion of alias '%s' failed; "
566 "'%s' is not a perf-command\n",
567 cmd, argv[0]);
568 goto out;
569 }
570 if (!done_help) {
571 cmd = argv[0] = help_unknown_cmd(cmd);
572 done_help = 1;
573 } else
574 break;
575 }
576
577 fprintf(stderr, "Failed to run command '%s': %s\n",
578 cmd, strerror_r(errno, sbuf, sizeof(sbuf)));
579 out:
580 return 1;
581 }
Linux with added FPC-III support