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TOMOYO Linux Cross Reference
Linux/tools/perf/perf.c

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

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