/*
* 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 "perf.h"
#include "util/build-id.h"
#include "util/cache.h"
#include "util/env.h"
#include <internal/lib.h> // page_size
#include <subcmd/exec-cmd.h>
#include "util/config.h"
#include <subcmd/run-command.h>
#include "util/parse-events.h"
#include <subcmd/parse-options.h>
#include <subcmd/help.h>
#include "util/debug.h"
#include "util/event.h"
#include "util/util.h" // usage()
#include "ui/ui.h"
#include "perf-sys.h"
#include <api/fs/fs.h>
#include <api/fs/tracing_path.h>
#include <perf/core.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/zalloc.h>
static int use_pager = -1;
static FILE *debug_fp = NULL;
struct cmd_struct {
const char *cmd;
int (*fn)(int, const char **);
int option;
};
static struct cmd_struct commands[] = {
{ "archive", NULL, 0 },
{ "buildid-cache", cmd_buildid_cache, 0 },
{ "buildid-list", cmd_buildid_list, 0 },
{ "check", cmd_check, 0 },
{ "config", cmd_config, 0 },
{ "c2c", cmd_c2c, 0 },
{ "diff", cmd_diff, 0 },
{ "evlist", cmd_evlist, 0 },
{ "help", cmd_help, 0 },
{ "iostat", NULL, 0 },
{ "kallsyms", cmd_kallsyms, 0 },
{ "list", cmd_list, 0 },
{ "record", cmd_record, 0 },
{ "report", cmd_report, 0 },
{ "bench", cmd_bench, 0 },
{ "stat", cmd_stat, 0 },
#ifdef HAVE_LIBTRACEEVENT
{ "timechart", cmd_timechart, 0 },
#endif
{ "top", cmd_top, 0 },
{ "annotate", cmd_annotate, 0 },
{ "version", cmd_version, 0 },
{ "script", cmd_script, 0 },
#ifdef HAVE_LIBTRACEEVENT
{ "sched", cmd_sched, 0 },
#endif
#ifdef HAVE_LIBELF_SUPPORT
{ "probe", cmd_probe, 0 },
#endif
#ifdef HAVE_LIBTRACEEVENT
{ "kmem", cmd_kmem, 0 },
{ "lock", cmd_lock, 0 },
#endif
{ "kvm", cmd_kvm, 0 },
{ "test", cmd_test, 0 },
#if defined(HAVE_LIBTRACEEVENT) && (defined(HAVE_LIBAUDIT_SUPPORT) || defined(HAVE_SYSCALL_TABLE_SUPPORT))
{ "trace", cmd_trace, 0 },
#endif
{ "inject", cmd_inject, 0 },
{ "mem", cmd_mem, 0 },
{ "data", cmd_data, 0 },
{ "ftrace", cmd_ftrace, 0 },
{ "daemon", cmd_daemon, 0 },
#ifdef HAVE_LIBTRACEEVENT
{ "kwork", cmd_kwork, 0 },
#endif
};
struct pager_config {
const char *cmd;
int val;
};
static bool same_cmd_with_prefix(const char *var, struct pager_config *c,
const char *header)
{
return (strstarts(var, header) && !strcmp(var + strlen(header), c->cmd));
}
static int pager_command_config(const char *var, const char *value, void *data)
{
struct pager_config *c = data;
if (same_cmd_with_prefix(var, c, "pager."))
c->val = perf_config_bool(var, value);
return 0;
}
/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
static int check_pager_config(const char *cmd)
{
int err;
struct pager_config c;
c.cmd = cmd;
c.val = -1;
err = perf_config(pager_command_config, &c);
return err ?: c.val;
}
static int browser_command_config(const char *var, const char *value, void *data)
{
struct pager_config *c = data;
if (same_cmd_with_prefix(var, c, "tui."))
c->val = perf_config_bool(var, value);
if (same_cmd_with_prefix(var, c, "gtk."))
c->val = perf_config_bool(var, value) ? 2 : 0;
return 0;
}
/*
* returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
* and -1 for "not specified"
*/
static int check_browser_config(const char *cmd)
{
int err;
struct pager_config c;
c.cmd = cmd;
c.val = -1;
err = perf_config(browser_command_config, &c);
return err ?: c.val;
}
static void commit_pager_choice(void)
{
switch (use_pager) {
case 0:
setenv(PERF_PAGER_ENVIRONMENT, "cat", 1);
break;
case 1:
/* setup_pager(); */
break;
default:
break;
}
}
static int set_debug_file(const char *path)
{
debug_fp = fopen(path, "w");
if (!debug_fp) {
fprintf(stderr, "Open debug file '%s' failed: %s\n",
path, strerror(errno));
return -1;
}
debug_set_file(debug_fp);
return 0;
}
struct option options[] = {
OPT_ARGUMENT("help", "help"),
OPT_ARGUMENT("version", "version"),
OPT_ARGUMENT("exec-path", "exec-path"),
OPT_ARGUMENT("html-path", "html-path"),
OPT_ARGUMENT("paginate", "paginate"),
OPT_ARGUMENT("no-pager", "no-pager"),
OPT_ARGUMENT("debugfs-dir", "debugfs-dir"),
OPT_ARGUMENT("buildid-dir", "buildid-dir"),
OPT_ARGUMENT("list-cmds", "list-cmds"),
OPT_ARGUMENT("list-opts", "list-opts"),
OPT_ARGUMENT("debug", "debug"),
OPT_ARGUMENT("debug-file", "debug-file"),
OPT_END()
};
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;
/*
* Shortcut for '-h' and '-v' options to invoke help
* and version command.
*/
if (!strcmp(cmd, "-h")) {
(*argv)[0] = "--help";
break;
}
if (!strcmp(cmd, "-v")) {
(*argv)[0] = "--version";
break;
}
if (!strcmp(cmd, "-vv")) {
(*argv)[0] = "version";
verbose = 1;
break;
}
/*
* Check remaining flags.
*/
if (strstarts(cmd, CMD_EXEC_PATH)) {
cmd += strlen(CMD_EXEC_PATH);
if (*cmd == '=')
set_argv_exec_path(cmd + 1);
else {
puts(get_argv_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, "--debugfs-dir")) {
if (*argc < 2) {
fprintf(stderr, "No directory given for --debugfs-dir.\n");
usage(perf_usage_string);
}
tracing_path_set((*argv)[1]);
if (envchanged)
*envchanged = 1;
(*argv)++;
(*argc)--;
} else if (!strcmp(cmd, "--buildid-dir")) {
if (*argc < 2) {
fprintf(stderr, "No directory given for --buildid-dir.\n");
usage(perf_usage_string);
}
set_buildid_dir((*argv)[1]);
if (envchanged)
*envchanged = 1;
(*argv)++;
(*argc)--;
} else if (strstarts(cmd, CMD_DEBUGFS_DIR)) {
tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
fprintf(stderr, "dir: %s\n", tracing_path_mount());
if (envchanged)
*envchanged = 1;
} else if (!strcmp(cmd, "--list-cmds")) {
unsigned int i;
for (i = 0; i < ARRAY_SIZE(commands); i++) {
struct cmd_struct *p = commands+i;
printf("%s ", p->cmd);
}
putchar('\n');
exit(0);
} else if (!strcmp(cmd, "--list-opts")) {
unsigned int i;
for (i = 0; i < ARRAY_SIZE(options)-1; i++) {
struct option *p = options+i;
printf("--%s ", p->long_name);
}
putchar('\n');
exit(0);
} else if (!strcmp(cmd, "--debug")) {
if (*argc < 2) {
fprintf(stderr, "No variable specified for --debug.\n");
usage(perf_usage_string);
}
if (perf_debug_option((*argv)[1]))
usage(perf_usage_string);
(*argv)++;
(*argc)--;
} else if (!strcmp(cmd, "--debug-file")) {
if (*argc < 2) {
fprintf(stderr, "No path given for --debug-file.\n");
usage(perf_usage_string);
}
if (set_debug_file((*argv)[1]))
usage(perf_usage_string);
(*argv)++;
(*argc)--;
} else {
fprintf(stderr, "Unknown option: %s\n", cmd);
usage(perf_usage_string);
}
(*argv)++;
(*argc)--;
handled++;
}
return handled;
}
#define RUN_SETUP (1<<0)
#define USE_PAGER (1<<1)
static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
{
int status;
struct stat st;
char sbuf[STRERR_BUFSIZE];
if (use_browser == -1)
use_browser = check_browser_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();
perf_env__init(&perf_env);
perf_env__set_cmdline(&perf_env, argc, argv);
status = p->fn(argc, argv);
perf_config__exit();
exit_browser(status);
perf_env__exit(&perf_env);
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;
status = 1;
/* Check for ENOSPC and EIO errors.. */
if (fflush(stdout)) {
fprintf(stderr, "write failure on standard output: %s",
str_error_r(errno, sbuf, sizeof(sbuf)));
goto out;
}
if (ferror(stdout)) {
fprintf(stderr, "unknown write failure on standard output");
goto out;
}
if (fclose(stdout)) {
fprintf(stderr, "close failed on standard output: %s",
str_error_r(errno, sbuf, sizeof(sbuf)));
goto out;
}
status = 0;
out:
return status;
}
static void handle_internal_command(int argc, const char **argv)
{
const char *cmd = argv[0];
unsigned int i;
/* 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 (p->fn == NULL)
continue;
if (strcmp(p->cmd, cmd))
continue;
exit(run_builtin(p, argc, argv));
}
}
static void execv_dashed_external(const char **argv)
{
char *cmd;
const char *tmp;
int status;
if (asprintf(&cmd, "perf-%s", argv[0]) < 0)
goto do_die;
/*
* 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;
/*
* 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)) {
do_die:
pr_err("FATAL: unable to run '%s'", argv[0]);
status = -128;
}
exit(-status);
}
errno = ENOENT; /* as if we called execvp */
argv[0] = tmp;
zfree(&cmd);
}
static int run_argv(int *argcp, const char ***argv)
{
/* See if it's an internal command */
handle_internal_command(*argcp, *argv);
/* .. then try the external ones */
execv_dashed_external(*argv);
return 0;
}
static int libperf_print(enum libperf_print_level level,
const char *fmt, va_list ap)
{
return veprintf(level, verbose, fmt, ap);
}
int main(int argc, const char **argv)
{
int err, done_help = 0;
const char *cmd;
char sbuf[STRERR_BUFSIZE];
perf_debug_setup();
/* libsubcmd init */
exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
pager_init(PERF_PAGER_ENVIRONMENT);
libperf_init(libperf_print);
cmd = extract_argv0_path(argv[0]);
if (!cmd)
cmd = "perf-help";
srandom(time(NULL));
/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
config_exclusive_filename = getenv("PERF_CONFIG");
err = perf_config(perf_default_config, NULL);
if (err)
return err;
set_buildid_dir(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. If that one
* fails to handle this, then maybe we just run a renamed perf binary
* that contains a dash in its name. To handle this scenario, we just
* fall through and ignore the "xxxx" part of the command string.
*/
if (strstarts(cmd, "perf-")) {
cmd += 5;
argv[0] = cmd;
handle_internal_command(argc, argv);
/*
* If the command is handled, the above function does not
* return undo changes and fall through in such a case.
*/
cmd -= 5;
argv[0] = cmd;
}
if (strstarts(cmd, "trace")) {
#ifndef HAVE_LIBTRACEEVENT
fprintf(stderr,
"trace command not available: missing libtraceevent devel package at build time.\n");
goto out;
#elif !defined(HAVE_LIBAUDIT_SUPPORT) && !defined(HAVE_SYSCALL_TABLE_SUPPORT)
fprintf(stderr,
"trace command not available: missing audit-libs devel package at build time.\n");
goto out;
#else
setup_path();
argv[0] = "trace";
return cmd_trace(argc, argv);
#endif
}
/* Look for flags.. */
argv++;
argc--;
handle_options(&argv, &argc, NULL);
commit_pager_choice();
if (argc > 0) {
if (strstarts(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);
goto out;
}
cmd = argv[0];
test_attr__init();
/*
* 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) {
run_argv(&argc, &argv);
if (errno != ENOENT)
break;
if (!done_help) {
struct cmdnames main_cmds = {};
for (unsigned int i = 0; i < ARRAY_SIZE(commands); i++) {
add_cmdname(&main_cmds,
commands[i].cmd,
strlen(commands[i].cmd));
}
cmd = argv[0] = help_unknown_cmd(cmd, &main_cmds);
clean_cmdnames(&main_cmds);
done_help = 1;
if (!cmd)
break;
} else
break;
}
if (cmd) {
fprintf(stderr, "Failed to run command '%s': %s\n",
cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
}
out:
if (debug_fp)
fclose(debug_fp);
return 1;
}
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