/* * perf.c * * Performance analysis utility. * * This is the main hub from which the sub-commands (perf stat, * perf top, perf record, perf report, etc.) are started. */#include "builtin.h" #include "util/exec_cmd.h"#include "util/cache.h"#include "util/quote.h"#include "util/run-command.h"#include "util/parse-events.h"#include "util/debugfs.h" const char perf_usage_string[] =	"perf [--version] [--help] COMMAND [ARGS]"; const char perf_more_info_string[] =	"See 'perf help COMMAND' for more information on a specific command."; int use_browser = -1;static int use_pager = -1; struct pager_config {	const char *cmd;	int val;}; static int pager_command_config(const char *var, const char *value, void *data){	struct pager_config *c = data;	if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))		c->val = perf_config_bool(var, value);	return 0;} /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */int check_pager_config(const char *cmd){	struct pager_config c;	c.cmd = cmd;	c.val = -1;	perf_config(pager_command_config, &c);	return c.val;} static int tui_command_config(const char *var, const char *value, void *data){	struct pager_config *c = data;	if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))		c->val = perf_config_bool(var, value);	return 0;} /* returns 0 for "no tui", 1 for "use tui", and -1 for "not specified" */static int check_tui_config(const char *cmd){	struct pager_config c;	c.cmd = cmd;	c.val = -1;	perf_config(tui_command_config, &c);	return c.val;} static void commit_pager_choice(void){	switch (use_pager) {	case 0:		setenv("PERF_PAGER", "cat", 1);		break;	case 1:		/* setup_pager(); */		break;	default:		break;	}} static int handle_options(const char ***argv, int *argc, int *envchanged){	int handled = 0; 	while (*argc > 0) {		const char *cmd = (*argv)[0];		if (cmd[0] != '-')			break; 		/*		 * For legacy reasons, the "version" and "help"		 * commands can be written with "--" prepended		 * to make them look like flags.		 */		if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))			break; 		/*		 * Check remaining flags.		 */		if (!prefixcmp(cmd, CMD_EXEC_PATH)) {			cmd += strlen(CMD_EXEC_PATH);			if (*cmd == '=')				perf_set_argv_exec_path(cmd + 1);			else {				puts(perf_exec_path());				exit(0);			}		} else if (!strcmp(cmd, "--html-path")) {			puts(system_path(PERF_HTML_PATH));			exit(0);		} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {			use_pager = 1;		} else if (!strcmp(cmd, "--no-pager")) {			use_pager = 0;			if (envchanged)				*envchanged = 1;		} else if (!strcmp(cmd, "--perf-dir")) {			if (*argc < 2) {				fprintf(stderr, "No directory given for --perf-dir.\n");				usage(perf_usage_string);			}			setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1);			if (envchanged)				*envchanged = 1;			(*argv)++;			(*argc)--;			handled++;		} else if (!prefixcmp(cmd, CMD_PERF_DIR)) {			setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1);			if (envchanged)				*envchanged = 1;		} else if (!strcmp(cmd, "--work-tree")) {			if (*argc < 2) {				fprintf(stderr, "No directory given for --work-tree.\n");				usage(perf_usage_string);			}			setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);			if (envchanged)				*envchanged = 1;			(*argv)++;			(*argc)--;		} else if (!prefixcmp(cmd, CMD_WORK_TREE)) {			setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1);			if (envchanged)				*envchanged = 1;		} else if (!strcmp(cmd, "--debugfs-dir")) {			if (*argc < 2) {				fprintf(stderr, "No directory given for --debugfs-dir.\n");				usage(perf_usage_string);			}			debugfs_set_path((*argv)[1]);			if (envchanged)				*envchanged = 1;			(*argv)++;			(*argc)--;		} else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {			debugfs_set_path(cmd + strlen(CMD_DEBUGFS_DIR));			fprintf(stderr, "dir: %s\n", debugfs_mountpoint);			if (envchanged)				*envchanged = 1;		} else {			fprintf(stderr, "Unknown option: %s\n", cmd);			usage(perf_usage_string);		} 		(*argv)++;		(*argc)--;		handled++;	}	return handled;} static int handle_alias(int *argcp, const char ***argv){	int envchanged = 0, ret = 0, saved_errno = errno;	int count, option_count;	const char **new_argv;	const char *alias_command;	char *alias_string; 	alias_command = (*argv)[0];	alias_string = alias_lookup(alias_command);	if (alias_string) {		if (alias_string[0] == '!') {			if (*argcp > 1) {				struct strbuf buf; 				strbuf_init(&buf, PATH_MAX);				strbuf_addstr(&buf, alias_string);				sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);				free(alias_string);				alias_string = buf.buf;			}			ret = system(alias_string + 1);			if (ret >= 0 && WIFEXITED(ret) &&			    WEXITSTATUS(ret) != 127)				exit(WEXITSTATUS(ret));			die("Failed to run '%s' when expanding alias '%s'",			    alias_string + 1, alias_command);		}		count = split_cmdline(alias_string, &new_argv);		if (count < 0)			die("Bad alias.%s string", alias_command);		option_count = handle_options(&new_argv, &count, &envchanged);		if (envchanged)			die("alias '%s' changes environment variables\n"				 "You can use '!perf' in the alias to do this.",				 alias_command);		memmove(new_argv - option_count, new_argv,				count * sizeof(char *));		new_argv -= option_count; 		if (count < 1)			die("empty alias for %s", alias_command); 		if (!strcmp(alias_command, new_argv[0]))			die("recursive alias: %s", alias_command); 		new_argv = realloc(new_argv, sizeof(char *) *				    (count + *argcp + 1));		/* insert after command name */		memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);		new_argv[count + *argcp] = NULL; 		*argv = new_argv;		*argcp += count - 1; 		ret = 1;	} 	errno = saved_errno; 	return ret;} const char perf_version_string[] = PERF_VERSION; #define RUN_SETUP	(1<<0)#define USE_PAGER	(1<<1)/* * require working tree to be present -- anything uses this needs * RUN_SETUP for reading from the configuration file. */#define NEED_WORK_TREE	(1<<2) struct cmd_struct {	const char *cmd;	int (*fn)(int, const char **, const char *);	int option;}; static int run_builtin(struct cmd_struct *p, int argc, const char **argv){	int status;	struct stat st;	const char *prefix; 	prefix = NULL;	if (p->option & RUN_SETUP)		prefix = NULL; /* setup_perf_directory(); */ 	if (use_browser == -1)		use_browser = check_tui_config(p->cmd); 	if (use_pager == -1 && p->option & RUN_SETUP)		use_pager = check_pager_config(p->cmd);	if (use_pager == -1 && p->option & USE_PAGER)		use_pager = 1;	commit_pager_choice(); 	status = p->fn(argc, argv, prefix);	exit_browser(status); 	if (status)		return status & 0xff; 	/* Somebody closed stdout? */	if (fstat(fileno(stdout), &st))		return 0;	/* Ignore write errors for pipes and sockets.. */	if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))		return 0; 	/* Check for ENOSPC and EIO errors.. */	if (fflush(stdout))		die("write failure on standard output: %s", strerror(errno));	if (ferror(stdout))		die("unknown write failure on standard output");	if (fclose(stdout))		die("close failed on standard output: %s", strerror(errno));	return 0;} static void handle_internal_command(int argc, const char **argv){	const char *cmd = argv[0];	static struct cmd_struct commands[] = {		{ "buildid-cache", cmd_buildid_cache, 0 },		{ "buildid-list", cmd_buildid_list, 0 },		{ "diff",	cmd_diff,	0 },		{ "evlist",	cmd_evlist,	0 },		{ "help",	cmd_help,	0 },		{ "list",	cmd_list,	0 },		{ "record",	cmd_record,	0 },		{ "report",	cmd_report,	0 },		{ "bench",	cmd_bench,	0 },		{ "stat",	cmd_stat,	0 },		{ "timechart",	cmd_timechart,	0 },		{ "top",	cmd_top,	0 },		{ "annotate",	cmd_annotate,	0 },		{ "version",	cmd_version,	0 },		{ "script",	cmd_script,	0 },		{ "sched",	cmd_sched,	0 },		{ "probe",	cmd_probe,	0 },		{ "kmem",	cmd_kmem,	0 },		{ "lock",	cmd_lock,	0 },		{ "kvm",	cmd_kvm,	0 },		{ "test",	cmd_test,	0 },		{ "inject",	cmd_inject,	0 },	};	unsigned int i;	static const char ext[] = STRIP_EXTENSION; 	if (sizeof(ext) > 1) {		i = strlen(argv[0]) - strlen(ext);		if (i > 0 && !strcmp(argv[0] + i, ext)) {			char *argv0 = strdup(argv[0]);			argv[0] = cmd = argv0;			argv0[i] = '\0';		}	} 	/* Turn "perf cmd --help" into "perf help cmd" */	if (argc > 1 && !strcmp(argv[1], "--help")) {		argv[1] = argv[0];		argv[0] = cmd = "help";	} 	for (i = 0; i < ARRAY_SIZE(commands); i++) {		struct cmd_struct *p = commands+i;		if (strcmp(p->cmd, cmd))			continue;		exit(run_builtin(p, argc, argv));	}} static void execv_dashed_external(const char **argv){	struct strbuf cmd = STRBUF_INIT;	const char *tmp;	int status; 	strbuf_addf(&cmd, "perf-%s", argv[0]); 	/*	 * argv[0] must be the perf command, but the argv array	 * belongs to the caller, and may be reused in	 * subsequent loop iterations. Save argv[0] and	 * restore it on error.	 */	tmp = argv[0];	argv[0] = cmd.buf; 	/*	 * if we fail because the command is not found, it is	 * OK to return. Otherwise, we just pass along the status code.	 */	status = run_command_v_opt(argv, 0);	if (status != -ERR_RUN_COMMAND_EXEC) {		if (IS_RUN_COMMAND_ERR(status))			die("unable to run '%s'", argv[0]);		exit(-status);	}	errno = ENOENT; /* as if we called execvp */ 	argv[0] = tmp; 	strbuf_release(&cmd);} static int run_argv(int *argcp, const char ***argv){	int done_alias = 0; 	while (1) {		/* See if it's an internal command */		handle_internal_command(*argcp, *argv); 		/* .. then try the external ones */		execv_dashed_external(*argv); 		/* It could be an alias -- this works around the insanity		 * of overriding "perf log" with "perf show" by having		 * alias.log = show		 */		if (done_alias || !handle_alias(argcp, argv))			break;		done_alias = 1;	} 	return done_alias;} static void pthread__block_sigwinch(void){	sigset_t set; 	sigemptyset(&set);	sigaddset(&set, SIGWINCH);	pthread_sigmask(SIG_BLOCK, &set, NULL);} void pthread__unblock_sigwinch(void){	sigset_t set; 	sigemptyset(&set);	sigaddset(&set, SIGWINCH);	pthread_sigmask(SIG_UNBLOCK, &set, NULL);} int main(int argc, const char **argv){	const char *cmd; 	cmd = perf_extract_argv0_path(argv[0]);	if (!cmd)		cmd = "perf-help";	/* get debugfs mount point from /proc/mounts */	debugfs_mount(NULL);	/*	 * "perf-xxxx" is the same as "perf xxxx", but we obviously:	 *	 *  - cannot take flags in between the "perf" and the "xxxx".	 *  - cannot execute it externally (since it would just do	 *    the same thing over again)	 *	 * So we just directly call the internal command handler, and	 * die if that one cannot handle it.	 */	if (!prefixcmp(cmd, "perf-")) {		cmd += 5;		argv[0] = cmd;		handle_internal_command(argc, argv);		die("cannot handle %s internally", cmd);	} 	/* Look for flags.. */	argv++;	argc--;	handle_options(&argv, &argc, NULL);	commit_pager_choice();	set_buildid_dir(); 	if (argc > 0) {		if (!prefixcmp(argv[0], "--"))			argv[0] += 2;	} else {		/* The user didn't specify a command; give them help */		printf("\n usage: %s\n\n", perf_usage_string);		list_common_cmds_help();		printf("\n %s\n\n", perf_more_info_string);		exit(1);	}	cmd = argv[0]; 	/*	 * We use PATH to find perf commands, but we prepend some higher	 * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH	 * environment, and the $(perfexecdir) from the Makefile at build	 * time.	 */	setup_path();	/*	 * Block SIGWINCH notifications so that the thread that wants it can	 * unblock and get syscalls like select interrupted instead of waiting	 * forever while the signal goes to some other non interested thread.	 */	pthread__block_sigwinch(); 	while (1) {		static int done_help;		static int was_alias; 		was_alias = run_argv(&argc, &argv);		if (errno != ENOENT)			break; 		if (was_alias) {			fprintf(stderr, "Expansion of alias '%s' failed; "				"'%s' is not a perf-command\n",				cmd, argv[0]);			exit(1);		}		if (!done_help) {			cmd = argv[0] = help_unknown_cmd(cmd);			done_help = 1;		} else

Lines 1–500 of 508. Load more