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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 },
Li Zefanba77c9e2009-11-20 15:53:25 +0800316 { "help", cmd_help, 0 },
317 { "list", cmd_list, 0 },
318 { "record", cmd_record, 0 },
319 { "report", cmd_report, 0 },
320 { "bench", cmd_bench, 0 },
321 { "stat", cmd_stat, 0 },
322 { "timechart", cmd_timechart, 0 },
323 { "top", cmd_top, 0 },
324 { "annotate", cmd_annotate, 0 },
325 { "version", cmd_version, 0 },
326 { "trace", cmd_trace, 0 },
327 { "sched", cmd_sched, 0 },
328 { "probe", cmd_probe, 0 },
329 { "kmem", cmd_kmem, 0 },
Hitoshi Mitake9b5e3502010-01-30 20:43:33 +0900330 { "lock", cmd_lock, 0 },
Zhang, Yanmina1645ce2010-04-19 13:32:50 +0800331 { "kvm", cmd_kvm, 0 },
Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -0300332 { "test", cmd_test, 0 },
Tom Zanussi454c4072010-05-01 01:41:20 -0500333 { "inject", cmd_inject, 0 },
Ingo Molnar07800602009-04-20 15:00:56 +0200334 };
Ingo Molnarf37a2912009-07-01 12:37:06 +0200335 unsigned int i;
Ingo Molnar07800602009-04-20 15:00:56 +0200336 static const char ext[] = STRIP_EXTENSION;
337
338 if (sizeof(ext) > 1) {
339 i = strlen(argv[0]) - strlen(ext);
340 if (i > 0 && !strcmp(argv[0] + i, ext)) {
341 char *argv0 = strdup(argv[0]);
342 argv[0] = cmd = argv0;
343 argv0[i] = '\0';
344 }
345 }
346
347 /* Turn "perf cmd --help" into "perf help cmd" */
348 if (argc > 1 && !strcmp(argv[1], "--help")) {
349 argv[1] = argv[0];
350 argv[0] = cmd = "help";
351 }
352
353 for (i = 0; i < ARRAY_SIZE(commands); i++) {
354 struct cmd_struct *p = commands+i;
355 if (strcmp(p->cmd, cmd))
356 continue;
357 exit(run_builtin(p, argc, argv));
358 }
359}
360
361static void execv_dashed_external(const char **argv)
362{
363 struct strbuf cmd = STRBUF_INIT;
364 const char *tmp;
365 int status;
366
367 strbuf_addf(&cmd, "perf-%s", argv[0]);
368
369 /*
370 * argv[0] must be the perf command, but the argv array
371 * belongs to the caller, and may be reused in
372 * subsequent loop iterations. Save argv[0] and
373 * restore it on error.
374 */
375 tmp = argv[0];
376 argv[0] = cmd.buf;
377
378 /*
379 * if we fail because the command is not found, it is
380 * OK to return. Otherwise, we just pass along the status code.
381 */
382 status = run_command_v_opt(argv, 0);
383 if (status != -ERR_RUN_COMMAND_EXEC) {
384 if (IS_RUN_COMMAND_ERR(status))
385 die("unable to run '%s'", argv[0]);
386 exit(-status);
387 }
388 errno = ENOENT; /* as if we called execvp */
389
390 argv[0] = tmp;
391
392 strbuf_release(&cmd);
393}
394
395static int run_argv(int *argcp, const char ***argv)
396{
397 int done_alias = 0;
398
399 while (1) {
400 /* See if it's an internal command */
401 handle_internal_command(*argcp, *argv);
402
403 /* .. then try the external ones */
404 execv_dashed_external(*argv);
405
406 /* It could be an alias -- this works around the insanity
407 * of overriding "perf log" with "perf show" by having
408 * alias.log = show
409 */
410 if (done_alias || !handle_alias(argcp, argv))
411 break;
412 done_alias = 1;
413 }
414
415 return done_alias;
416}
417
Jason Baron5beeded2009-07-21 14:16:29 -0400418/* mini /proc/mounts parser: searching for "^blah /mount/point debugfs" */
419static void get_debugfs_mntpt(void)
420{
Xiao Guangrong29c52aa2009-12-28 16:47:12 +0800421 const char *path = debugfs_mount(NULL);
Jason Baron5beeded2009-07-21 14:16:29 -0400422
Clark Williams549104f2009-11-08 09:03:07 -0600423 if (path)
424 strncpy(debugfs_mntpt, path, sizeof(debugfs_mntpt));
425 else
426 debugfs_mntpt[0] = '\0';
Jason Baron5beeded2009-07-21 14:16:29 -0400427}
Ingo Molnar07800602009-04-20 15:00:56 +0200428
429int main(int argc, const char **argv)
430{
431 const char *cmd;
432
433 cmd = perf_extract_argv0_path(argv[0]);
434 if (!cmd)
435 cmd = "perf-help";
Jason Baron5beeded2009-07-21 14:16:29 -0400436 /* get debugfs mount point from /proc/mounts */
437 get_debugfs_mntpt();
Ingo Molnar07800602009-04-20 15:00:56 +0200438 /*
439 * "perf-xxxx" is the same as "perf xxxx", but we obviously:
440 *
441 * - cannot take flags in between the "perf" and the "xxxx".
442 * - cannot execute it externally (since it would just do
443 * the same thing over again)
444 *
445 * So we just directly call the internal command handler, and
446 * die if that one cannot handle it.
447 */
448 if (!prefixcmp(cmd, "perf-")) {
Peter Zijlstra266dfb02009-05-25 14:45:24 +0200449 cmd += 5;
Ingo Molnar07800602009-04-20 15:00:56 +0200450 argv[0] = cmd;
451 handle_internal_command(argc, argv);
452 die("cannot handle %s internally", cmd);
453 }
454
455 /* Look for flags.. */
456 argv++;
457 argc--;
458 handle_options(&argv, &argc, NULL);
459 commit_pager_choice();
Jason Baron5beeded2009-07-21 14:16:29 -0400460 set_debugfs_path();
Stephane Eranian45de34b2010-06-01 21:25:01 +0200461 set_buildid_dir();
462
Ingo Molnar07800602009-04-20 15:00:56 +0200463 if (argc > 0) {
464 if (!prefixcmp(argv[0], "--"))
465 argv[0] += 2;
466 } else {
467 /* The user didn't specify a command; give them help */
Ingo Molnar502fc5c2009-03-13 03:20:49 +0100468 printf("\n usage: %s\n\n", perf_usage_string);
Ingo Molnar07800602009-04-20 15:00:56 +0200469 list_common_cmds_help();
Ingo Molnar502fc5c2009-03-13 03:20:49 +0100470 printf("\n %s\n\n", perf_more_info_string);
Ingo Molnar07800602009-04-20 15:00:56 +0200471 exit(1);
472 }
473 cmd = argv[0];
474
475 /*
476 * We use PATH to find perf commands, but we prepend some higher
Uwe Kleine-König659431f2010-01-18 16:02:48 +0100477 * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
Ingo Molnar07800602009-04-20 15:00:56 +0200478 * environment, and the $(perfexecdir) from the Makefile at build
479 * time.
480 */
481 setup_path();
482
483 while (1) {
Thiago Farina4c574152010-01-27 21:05:55 -0200484 static int done_help;
485 static int was_alias;
Ingo Molnar8035e422009-06-06 15:19:13 +0200486
Ingo Molnar07800602009-04-20 15:00:56 +0200487 was_alias = run_argv(&argc, &argv);
488 if (errno != ENOENT)
489 break;
Ingo Molnar8035e422009-06-06 15:19:13 +0200490
Ingo Molnar07800602009-04-20 15:00:56 +0200491 if (was_alias) {
492 fprintf(stderr, "Expansion of alias '%s' failed; "
493 "'%s' is not a perf-command\n",
494 cmd, argv[0]);
495 exit(1);
496 }
497 if (!done_help) {
498 cmd = argv[0] = help_unknown_cmd(cmd);
499 done_help = 1;
500 } else
501 break;
502 }
503
504 fprintf(stderr, "Failed to run command '%s': %s\n",
505 cmd, strerror(errno));
506
507 return 1;
508}