554 lines
13 KiB
C
554 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* perf.c
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*
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* Performance analysis utility.
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*
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* This is the main hub from which the sub-commands (perf stat,
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* perf top, perf record, perf report, etc.) are started.
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*/
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#include "builtin.h"
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#include "util/env.h"
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#include <subcmd/exec-cmd.h>
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#include "util/config.h"
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#include "util/quote.h"
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#include <subcmd/run-command.h>
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#include "util/parse-events.h"
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#include <subcmd/parse-options.h>
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#include "util/bpf-loader.h"
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#include "util/debug.h"
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#include "util/event.h"
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#include <api/fs/fs.h>
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#include <api/fs/tracing_path.h>
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#include <errno.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <linux/kernel.h>
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const char perf_usage_string[] =
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"perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
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const char perf_more_info_string[] =
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"See 'perf help COMMAND' for more information on a specific command.";
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static int use_pager = -1;
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const char *input_name;
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struct cmd_struct {
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const char *cmd;
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int (*fn)(int, const char **);
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int option;
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};
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static struct cmd_struct commands[] = {
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{ "buildid-cache", cmd_buildid_cache, 0 },
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{ "buildid-list", cmd_buildid_list, 0 },
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{ "config", cmd_config, 0 },
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{ "c2c", cmd_c2c, 0 },
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{ "diff", cmd_diff, 0 },
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{ "evlist", cmd_evlist, 0 },
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{ "help", cmd_help, 0 },
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{ "kallsyms", cmd_kallsyms, 0 },
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{ "list", cmd_list, 0 },
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{ "record", cmd_record, 0 },
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{ "report", cmd_report, 0 },
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{ "bench", cmd_bench, 0 },
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{ "stat", cmd_stat, 0 },
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{ "timechart", cmd_timechart, 0 },
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{ "top", cmd_top, 0 },
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{ "annotate", cmd_annotate, 0 },
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{ "version", cmd_version, 0 },
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{ "script", cmd_script, 0 },
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{ "sched", cmd_sched, 0 },
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#ifdef HAVE_LIBELF_SUPPORT
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{ "probe", cmd_probe, 0 },
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#endif
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{ "kmem", cmd_kmem, 0 },
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{ "lock", cmd_lock, 0 },
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{ "kvm", cmd_kvm, 0 },
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{ "test", cmd_test, 0 },
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#ifdef HAVE_LIBAUDIT_SUPPORT
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{ "trace", cmd_trace, 0 },
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#endif
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{ "inject", cmd_inject, 0 },
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{ "mem", cmd_mem, 0 },
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{ "data", cmd_data, 0 },
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{ "ftrace", cmd_ftrace, 0 },
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};
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struct pager_config {
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const char *cmd;
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int val;
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};
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static int pager_command_config(const char *var, const char *value, void *data)
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{
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struct pager_config *c = data;
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if (strstarts(var, "pager.") && !strcmp(var + 6, c->cmd))
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c->val = perf_config_bool(var, value);
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return 0;
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}
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/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
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static int check_pager_config(const char *cmd)
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{
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int err;
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struct pager_config c;
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c.cmd = cmd;
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c.val = -1;
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err = perf_config(pager_command_config, &c);
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return err ?: c.val;
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}
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static int browser_command_config(const char *var, const char *value, void *data)
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{
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struct pager_config *c = data;
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if (strstarts(var, "tui.") && !strcmp(var + 4, c->cmd))
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c->val = perf_config_bool(var, value);
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if (strstarts(var, "gtk.") && !strcmp(var + 4, c->cmd))
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c->val = perf_config_bool(var, value) ? 2 : 0;
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return 0;
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}
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/*
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* returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
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* and -1 for "not specified"
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*/
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static int check_browser_config(const char *cmd)
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{
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int err;
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struct pager_config c;
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c.cmd = cmd;
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c.val = -1;
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err = perf_config(browser_command_config, &c);
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return err ?: c.val;
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}
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static void commit_pager_choice(void)
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{
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switch (use_pager) {
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case 0:
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setenv(PERF_PAGER_ENVIRONMENT, "cat", 1);
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break;
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case 1:
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/* setup_pager(); */
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break;
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default:
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break;
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}
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}
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struct option options[] = {
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OPT_ARGUMENT("help", "help"),
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OPT_ARGUMENT("version", "version"),
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OPT_ARGUMENT("exec-path", "exec-path"),
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OPT_ARGUMENT("html-path", "html-path"),
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OPT_ARGUMENT("paginate", "paginate"),
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OPT_ARGUMENT("no-pager", "no-pager"),
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OPT_ARGUMENT("debugfs-dir", "debugfs-dir"),
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OPT_ARGUMENT("buildid-dir", "buildid-dir"),
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OPT_ARGUMENT("list-cmds", "list-cmds"),
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OPT_ARGUMENT("list-opts", "list-opts"),
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OPT_ARGUMENT("debug", "debug"),
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OPT_END()
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};
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static int handle_options(const char ***argv, int *argc, int *envchanged)
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{
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int handled = 0;
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while (*argc > 0) {
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const char *cmd = (*argv)[0];
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if (cmd[0] != '-')
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break;
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/*
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* For legacy reasons, the "version" and "help"
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* commands can be written with "--" prepended
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* to make them look like flags.
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*/
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if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
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break;
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/*
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* Shortcut for '-h' and '-v' options to invoke help
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* and version command.
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*/
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if (!strcmp(cmd, "-h")) {
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(*argv)[0] = "--help";
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break;
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}
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if (!strcmp(cmd, "-v")) {
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(*argv)[0] = "--version";
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break;
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}
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/*
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* Check remaining flags.
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*/
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if (strstarts(cmd, CMD_EXEC_PATH)) {
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cmd += strlen(CMD_EXEC_PATH);
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if (*cmd == '=')
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set_argv_exec_path(cmd + 1);
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else {
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puts(get_argv_exec_path());
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exit(0);
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}
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} else if (!strcmp(cmd, "--html-path")) {
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puts(system_path(PERF_HTML_PATH));
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exit(0);
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} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
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use_pager = 1;
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} else if (!strcmp(cmd, "--no-pager")) {
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use_pager = 0;
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--debugfs-dir")) {
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if (*argc < 2) {
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fprintf(stderr, "No directory given for --debugfs-dir.\n");
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usage(perf_usage_string);
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}
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tracing_path_set((*argv)[1]);
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if (envchanged)
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*envchanged = 1;
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(*argv)++;
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(*argc)--;
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} else if (!strcmp(cmd, "--buildid-dir")) {
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if (*argc < 2) {
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fprintf(stderr, "No directory given for --buildid-dir.\n");
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usage(perf_usage_string);
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}
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set_buildid_dir((*argv)[1]);
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if (envchanged)
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*envchanged = 1;
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(*argv)++;
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(*argc)--;
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} else if (strstarts(cmd, CMD_DEBUGFS_DIR)) {
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tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
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fprintf(stderr, "dir: %s\n", tracing_path);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--list-cmds")) {
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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struct cmd_struct *p = commands+i;
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printf("%s ", p->cmd);
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}
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putchar('\n');
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exit(0);
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} else if (!strcmp(cmd, "--list-opts")) {
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(options)-1; i++) {
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struct option *p = options+i;
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printf("--%s ", p->long_name);
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}
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putchar('\n');
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exit(0);
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} else if (!strcmp(cmd, "--debug")) {
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if (*argc < 2) {
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fprintf(stderr, "No variable specified for --debug.\n");
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usage(perf_usage_string);
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}
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if (perf_debug_option((*argv)[1]))
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usage(perf_usage_string);
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(*argv)++;
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(*argc)--;
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} else {
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fprintf(stderr, "Unknown option: %s\n", cmd);
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usage(perf_usage_string);
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}
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(*argv)++;
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(*argc)--;
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handled++;
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}
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return handled;
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}
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#define RUN_SETUP (1<<0)
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#define USE_PAGER (1<<1)
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static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
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{
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int status;
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struct stat st;
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char sbuf[STRERR_BUFSIZE];
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if (use_browser == -1)
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use_browser = check_browser_config(p->cmd);
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if (use_pager == -1 && p->option & RUN_SETUP)
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use_pager = check_pager_config(p->cmd);
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if (use_pager == -1 && p->option & USE_PAGER)
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use_pager = 1;
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commit_pager_choice();
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perf_env__set_cmdline(&perf_env, argc, argv);
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status = p->fn(argc, argv);
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perf_config__exit();
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exit_browser(status);
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perf_env__exit(&perf_env);
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bpf__clear();
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if (status)
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return status & 0xff;
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/* Somebody closed stdout? */
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if (fstat(fileno(stdout), &st))
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return 0;
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/* Ignore write errors for pipes and sockets.. */
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if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
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return 0;
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status = 1;
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/* Check for ENOSPC and EIO errors.. */
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if (fflush(stdout)) {
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fprintf(stderr, "write failure on standard output: %s",
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out;
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}
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if (ferror(stdout)) {
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fprintf(stderr, "unknown write failure on standard output");
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goto out;
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}
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if (fclose(stdout)) {
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fprintf(stderr, "close failed on standard output: %s",
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out;
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}
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status = 0;
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out:
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return status;
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}
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static void handle_internal_command(int argc, const char **argv)
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{
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const char *cmd = argv[0];
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unsigned int i;
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/* Turn "perf cmd --help" into "perf help cmd" */
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if (argc > 1 && !strcmp(argv[1], "--help")) {
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argv[1] = argv[0];
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argv[0] = cmd = "help";
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}
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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struct cmd_struct *p = commands+i;
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if (strcmp(p->cmd, cmd))
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continue;
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exit(run_builtin(p, argc, argv));
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}
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}
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static void execv_dashed_external(const char **argv)
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{
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char *cmd;
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const char *tmp;
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int status;
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if (asprintf(&cmd, "perf-%s", argv[0]) < 0)
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goto do_die;
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/*
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* argv[0] must be the perf command, but the argv array
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* belongs to the caller, and may be reused in
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* subsequent loop iterations. Save argv[0] and
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* restore it on error.
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*/
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tmp = argv[0];
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argv[0] = cmd;
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/*
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* if we fail because the command is not found, it is
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* OK to return. Otherwise, we just pass along the status code.
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*/
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status = run_command_v_opt(argv, 0);
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if (status != -ERR_RUN_COMMAND_EXEC) {
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if (IS_RUN_COMMAND_ERR(status)) {
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do_die:
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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 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);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef _SC_LEVEL1_DCACHE_LINESIZE
|
||
|
|
#define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE)
|
||
|
|
#else
|
||
|
|
static void cache_line_size(int *cacheline_sizep)
|
||
|
|
{
|
||
|
|
if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep))
|
||
|
|
pr_debug("cannot determine cache line size");
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
int main(int argc, const char **argv)
|
||
|
|
{
|
||
|
|
int err;
|
||
|
|
const char *cmd;
|
||
|
|
char sbuf[STRERR_BUFSIZE];
|
||
|
|
int value;
|
||
|
|
|
||
|
|
/* libsubcmd init */
|
||
|
|
exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
|
||
|
|
pager_init(PERF_PAGER_ENVIRONMENT);
|
||
|
|
|
||
|
|
/* The page_size is placed in util object. */
|
||
|
|
page_size = sysconf(_SC_PAGE_SIZE);
|
||
|
|
cache_line_size(&cacheline_size);
|
||
|
|
|
||
|
|
if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
|
||
|
|
sysctl_perf_event_max_stack = value;
|
||
|
|
|
||
|
|
if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0)
|
||
|
|
sysctl_perf_event_max_contexts_per_stack = value;
|
||
|
|
|
||
|
|
cmd = extract_argv0_path(argv[0]);
|
||
|
|
if (!cmd)
|
||
|
|
cmd = "perf-help";
|
||
|
|
|
||
|
|
srandom(time(NULL));
|
||
|
|
|
||
|
|
perf_config__init();
|
||
|
|
err = perf_config(perf_default_config, NULL);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
set_buildid_dir(NULL);
|
||
|
|
|
||
|
|
/* get debugfs/tracefs mount point from /proc/mounts */
|
||
|
|
tracing_path_mount();
|
||
|
|
|
||
|
|
/*
|
||
|
|
* "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")) {
|
||
|
|
#ifdef HAVE_LIBAUDIT_SUPPORT
|
||
|
|
setup_path();
|
||
|
|
argv[0] = "trace";
|
||
|
|
return cmd_trace(argc, argv);
|
||
|
|
#else
|
||
|
|
fprintf(stderr,
|
||
|
|
"trace command not available: missing audit-libs devel package at build time.\n");
|
||
|
|
goto out;
|
||
|
|
#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();
|
||
|
|
|
||
|
|
perf_debug_setup();
|
||
|
|
|
||
|
|
while (1) {
|
||
|
|
static int done_help;
|
||
|
|
|
||
|
|
run_argv(&argc, &argv);
|
||
|
|
|
||
|
|
if (errno != ENOENT)
|
||
|
|
break;
|
||
|
|
|
||
|
|
if (!done_help) {
|
||
|
|
cmd = argv[0] = help_unknown_cmd(cmd);
|
||
|
|
done_help = 1;
|
||
|
|
} else
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
fprintf(stderr, "Failed to run command '%s': %s\n",
|
||
|
|
cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
|
||
|
|
out:
|
||
|
|
return 1;
|
||
|
|
}
|