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555 lines
13 KiB
555 lines
13 KiB
/* |
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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 "perf.h" |
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|
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#include "util/build-id.h" |
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#include "util/cache.h" |
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#include "util/env.h" |
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#include <internal/lib.h> // page_size |
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#include <subcmd/exec-cmd.h> |
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#include "util/config.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 "util/util.h" // usage() |
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#include "ui/ui.h" |
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#include "perf-sys.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 <perf/core.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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#include <linux/string.h> |
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#include <linux/zalloc.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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#if defined(HAVE_LIBAUDIT_SUPPORT) || defined(HAVE_SYSCALL_TABLE_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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{ "daemon", cmd_daemon, 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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if (!strcmp(cmd, "-vv")) { |
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(*argv)[0] = "version"; |
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version_verbose = 1; |
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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_mount()); |
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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__init(&perf_env); |
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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]); |
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status = -128; |
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} |
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exit(-status); |
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} |
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errno = ENOENT; /* as if we called execvp */ |
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argv[0] = tmp; |
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zfree(&cmd); |
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} |
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static int run_argv(int *argcp, const char ***argv) |
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{ |
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/* See if it's an internal command */ |
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handle_internal_command(*argcp, *argv); |
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/* .. then try the external ones */ |
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execv_dashed_external(*argv); |
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return 0; |
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} |
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static void pthread__block_sigwinch(void) |
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{ |
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sigset_t set; |
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sigemptyset(&set); |
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sigaddset(&set, SIGWINCH); |
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pthread_sigmask(SIG_BLOCK, &set, NULL); |
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} |
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void pthread__unblock_sigwinch(void) |
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{ |
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sigset_t set; |
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sigemptyset(&set); |
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sigaddset(&set, SIGWINCH); |
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pthread_sigmask(SIG_UNBLOCK, &set, NULL); |
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} |
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static int libperf_print(enum libperf_print_level level, |
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const char *fmt, va_list ap) |
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{ |
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return eprintf(level, verbose, fmt, ap); |
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} |
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int main(int argc, const char **argv) |
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{ |
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int err; |
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const char *cmd; |
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char sbuf[STRERR_BUFSIZE]; |
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/* libsubcmd init */ |
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exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT); |
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pager_init(PERF_PAGER_ENVIRONMENT); |
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libperf_init(libperf_print); |
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cmd = extract_argv0_path(argv[0]); |
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if (!cmd) |
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cmd = "perf-help"; |
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srandom(time(NULL)); |
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/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */ |
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config_exclusive_filename = getenv("PERF_CONFIG"); |
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err = perf_config(perf_default_config, NULL); |
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if (err) |
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return err; |
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set_buildid_dir(NULL); |
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/* |
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* "perf-xxxx" is the same as "perf xxxx", but we obviously: |
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* |
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* - cannot take flags in between the "perf" and the "xxxx". |
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* - cannot execute it externally (since it would just do |
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* the same thing over again) |
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* |
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* So we just directly call the internal command handler. If that one |
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* fails to handle this, then maybe we just run a renamed perf binary |
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* that contains a dash in its name. To handle this scenario, we just |
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* fall through and ignore the "xxxx" part of the command string. |
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*/ |
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if (strstarts(cmd, "perf-")) { |
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cmd += 5; |
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argv[0] = cmd; |
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handle_internal_command(argc, argv); |
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/* |
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* If the command is handled, the above function does not |
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* return undo changes and fall through in such a case. |
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*/ |
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cmd -= 5; |
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argv[0] = cmd; |
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} |
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if (strstarts(cmd, "trace")) { |
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#if defined(HAVE_LIBAUDIT_SUPPORT) || defined(HAVE_SYSCALL_TABLE_SUPPORT) |
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setup_path(); |
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argv[0] = "trace"; |
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return cmd_trace(argc, argv); |
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#else |
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fprintf(stderr, |
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"trace command not available: missing audit-libs devel package at build time.\n"); |
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goto out; |
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#endif |
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} |
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/* Look for flags.. */ |
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argv++; |
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argc--; |
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handle_options(&argv, &argc, NULL); |
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commit_pager_choice(); |
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if (argc > 0) { |
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if (strstarts(argv[0], "--")) |
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argv[0] += 2; |
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} else { |
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/* The user didn't specify a command; give them help */ |
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printf("\n usage: %s\n\n", perf_usage_string); |
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list_common_cmds_help(); |
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printf("\n %s\n\n", perf_more_info_string); |
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goto out; |
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} |
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cmd = argv[0]; |
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test_attr__init(); |
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/* |
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* We use PATH to find perf commands, but we prepend some higher |
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* precedence paths: the "--exec-path" option, the PERF_EXEC_PATH |
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* environment, and the $(perfexecdir) from the Makefile at build |
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* time. |
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*/ |
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setup_path(); |
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/* |
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* Block SIGWINCH notifications so that the thread that wants it can |
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* unblock and get syscalls like select interrupted instead of waiting |
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* forever while the signal goes to some other non interested thread. |
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*/ |
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pthread__block_sigwinch(); |
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perf_debug_setup(); |
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while (1) { |
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static int done_help; |
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run_argv(&argc, &argv); |
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|
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if (errno != ENOENT) |
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break; |
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if (!done_help) { |
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cmd = argv[0] = help_unknown_cmd(cmd); |
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done_help = 1; |
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} else |
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break; |
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} |
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fprintf(stderr, "Failed to run command '%s': %s\n", |
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cmd, str_error_r(errno, sbuf, sizeof(sbuf))); |
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out: |
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return 1; |
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}
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