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976 lines
22 KiB
976 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* builtin-ftrace.c |
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* |
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* Copyright (c) 2013 LG Electronics, Namhyung Kim <[email protected]> |
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* Copyright (c) 2020 Changbin Du <[email protected]>, significant enhancement. |
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*/ |
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|
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#include "builtin.h" |
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|
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#include <errno.h> |
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#include <unistd.h> |
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#include <signal.h> |
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#include <stdlib.h> |
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#include <fcntl.h> |
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#include <poll.h> |
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#include <linux/capability.h> |
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#include <linux/string.h> |
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|
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#include "debug.h" |
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#include <subcmd/pager.h> |
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#include <subcmd/parse-options.h> |
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#include <api/fs/tracing_path.h> |
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#include "evlist.h" |
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#include "target.h" |
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#include "cpumap.h" |
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#include "thread_map.h" |
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#include "strfilter.h" |
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#include "util/cap.h" |
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#include "util/config.h" |
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#include "util/units.h" |
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#include "util/parse-sublevel-options.h" |
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|
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#define DEFAULT_TRACER "function_graph" |
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|
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struct perf_ftrace { |
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struct evlist *evlist; |
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struct target target; |
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const char *tracer; |
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struct list_head filters; |
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struct list_head notrace; |
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struct list_head graph_funcs; |
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struct list_head nograph_funcs; |
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int graph_depth; |
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unsigned long percpu_buffer_size; |
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bool inherit; |
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int func_stack_trace; |
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int func_irq_info; |
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int graph_nosleep_time; |
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int graph_noirqs; |
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int graph_verbose; |
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int graph_thresh; |
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unsigned int initial_delay; |
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}; |
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|
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struct filter_entry { |
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struct list_head list; |
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char name[]; |
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}; |
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|
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static volatile int workload_exec_errno; |
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static bool done; |
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|
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static void sig_handler(int sig __maybe_unused) |
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{ |
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done = true; |
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} |
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|
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/* |
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* evlist__prepare_workload will send a SIGUSR1 if the fork fails, since |
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* we asked by setting its exec_error to the function below, |
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* ftrace__workload_exec_failed_signal. |
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* |
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* XXX We need to handle this more appropriately, emitting an error, etc. |
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*/ |
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static void ftrace__workload_exec_failed_signal(int signo __maybe_unused, |
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siginfo_t *info __maybe_unused, |
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void *ucontext __maybe_unused) |
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{ |
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workload_exec_errno = info->si_value.sival_int; |
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done = true; |
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} |
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|
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static int __write_tracing_file(const char *name, const char *val, bool append) |
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{ |
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char *file; |
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int fd, ret = -1; |
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ssize_t size = strlen(val); |
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int flags = O_WRONLY; |
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char errbuf[512]; |
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char *val_copy; |
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|
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file = get_tracing_file(name); |
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if (!file) { |
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pr_debug("cannot get tracing file: %s\n", name); |
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return -1; |
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} |
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|
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if (append) |
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flags |= O_APPEND; |
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else |
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flags |= O_TRUNC; |
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fd = open(file, flags); |
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if (fd < 0) { |
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pr_debug("cannot open tracing file: %s: %s\n", |
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name, str_error_r(errno, errbuf, sizeof(errbuf))); |
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goto out; |
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} |
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/* |
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* Copy the original value and append a '\n'. Without this, |
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* the kernel can hide possible errors. |
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*/ |
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val_copy = strdup(val); |
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if (!val_copy) |
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goto out_close; |
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val_copy[size] = '\n'; |
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|
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if (write(fd, val_copy, size + 1) == size + 1) |
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ret = 0; |
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else |
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pr_debug("write '%s' to tracing/%s failed: %s\n", |
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val, name, str_error_r(errno, errbuf, sizeof(errbuf))); |
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|
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free(val_copy); |
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out_close: |
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close(fd); |
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out: |
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put_tracing_file(file); |
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return ret; |
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} |
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static int write_tracing_file(const char *name, const char *val) |
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{ |
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return __write_tracing_file(name, val, false); |
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} |
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static int append_tracing_file(const char *name, const char *val) |
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{ |
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return __write_tracing_file(name, val, true); |
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} |
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static int read_tracing_file_to_stdout(const char *name) |
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{ |
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char buf[4096]; |
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char *file; |
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int fd; |
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int ret = -1; |
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file = get_tracing_file(name); |
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if (!file) { |
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pr_debug("cannot get tracing file: %s\n", name); |
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return -1; |
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} |
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fd = open(file, O_RDONLY); |
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if (fd < 0) { |
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pr_debug("cannot open tracing file: %s: %s\n", |
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name, str_error_r(errno, buf, sizeof(buf))); |
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goto out; |
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} |
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|
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/* read contents to stdout */ |
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while (true) { |
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int n = read(fd, buf, sizeof(buf)); |
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if (n == 0) |
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break; |
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else if (n < 0) |
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goto out_close; |
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if (fwrite(buf, n, 1, stdout) != 1) |
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goto out_close; |
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} |
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ret = 0; |
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out_close: |
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close(fd); |
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out: |
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put_tracing_file(file); |
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return ret; |
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} |
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static int read_tracing_file_by_line(const char *name, |
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void (*cb)(char *str, void *arg), |
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void *cb_arg) |
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{ |
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char *line = NULL; |
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size_t len = 0; |
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char *file; |
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FILE *fp; |
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|
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file = get_tracing_file(name); |
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if (!file) { |
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pr_debug("cannot get tracing file: %s\n", name); |
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return -1; |
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} |
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fp = fopen(file, "r"); |
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if (fp == NULL) { |
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pr_debug("cannot open tracing file: %s\n", name); |
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put_tracing_file(file); |
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return -1; |
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} |
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|
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while (getline(&line, &len, fp) != -1) { |
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cb(line, cb_arg); |
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} |
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if (line) |
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free(line); |
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fclose(fp); |
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put_tracing_file(file); |
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return 0; |
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} |
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static int write_tracing_file_int(const char *name, int value) |
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{ |
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char buf[16]; |
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|
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snprintf(buf, sizeof(buf), "%d", value); |
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if (write_tracing_file(name, buf) < 0) |
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return -1; |
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return 0; |
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} |
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static int write_tracing_option_file(const char *name, const char *val) |
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{ |
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char *file; |
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int ret; |
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if (asprintf(&file, "options/%s", name) < 0) |
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return -1; |
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ret = __write_tracing_file(file, val, false); |
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free(file); |
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return ret; |
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} |
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static int reset_tracing_cpu(void); |
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static void reset_tracing_filters(void); |
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static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused) |
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{ |
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write_tracing_option_file("function-fork", "0"); |
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write_tracing_option_file("func_stack_trace", "0"); |
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write_tracing_option_file("sleep-time", "1"); |
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write_tracing_option_file("funcgraph-irqs", "1"); |
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write_tracing_option_file("funcgraph-proc", "0"); |
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write_tracing_option_file("funcgraph-abstime", "0"); |
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write_tracing_option_file("latency-format", "0"); |
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write_tracing_option_file("irq-info", "0"); |
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} |
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static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused) |
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{ |
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if (write_tracing_file("tracing_on", "0") < 0) |
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return -1; |
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|
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if (write_tracing_file("current_tracer", "nop") < 0) |
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return -1; |
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if (write_tracing_file("set_ftrace_pid", " ") < 0) |
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return -1; |
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if (reset_tracing_cpu() < 0) |
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return -1; |
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if (write_tracing_file("max_graph_depth", "0") < 0) |
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return -1; |
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if (write_tracing_file("tracing_thresh", "0") < 0) |
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return -1; |
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reset_tracing_filters(); |
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reset_tracing_options(ftrace); |
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return 0; |
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} |
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static int set_tracing_pid(struct perf_ftrace *ftrace) |
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{ |
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int i; |
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char buf[16]; |
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|
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if (target__has_cpu(&ftrace->target)) |
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return 0; |
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for (i = 0; i < perf_thread_map__nr(ftrace->evlist->core.threads); i++) { |
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scnprintf(buf, sizeof(buf), "%d", |
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perf_thread_map__pid(ftrace->evlist->core.threads, i)); |
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if (append_tracing_file("set_ftrace_pid", buf) < 0) |
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return -1; |
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} |
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return 0; |
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} |
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static int set_tracing_cpumask(struct perf_cpu_map *cpumap) |
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{ |
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char *cpumask; |
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size_t mask_size; |
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int ret; |
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int last_cpu; |
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last_cpu = cpu_map__cpu(cpumap, cpumap->nr - 1); |
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mask_size = last_cpu / 4 + 2; /* one more byte for EOS */ |
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mask_size += last_cpu / 32; /* ',' is needed for every 32th cpus */ |
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cpumask = malloc(mask_size); |
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if (cpumask == NULL) { |
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pr_debug("failed to allocate cpu mask\n"); |
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return -1; |
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} |
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cpu_map__snprint_mask(cpumap, cpumask, mask_size); |
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ret = write_tracing_file("tracing_cpumask", cpumask); |
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free(cpumask); |
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return ret; |
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} |
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static int set_tracing_cpu(struct perf_ftrace *ftrace) |
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{ |
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struct perf_cpu_map *cpumap = ftrace->evlist->core.cpus; |
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if (!target__has_cpu(&ftrace->target)) |
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return 0; |
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return set_tracing_cpumask(cpumap); |
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} |
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static int set_tracing_func_stack_trace(struct perf_ftrace *ftrace) |
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{ |
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if (!ftrace->func_stack_trace) |
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return 0; |
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if (write_tracing_option_file("func_stack_trace", "1") < 0) |
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return -1; |
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return 0; |
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} |
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static int set_tracing_func_irqinfo(struct perf_ftrace *ftrace) |
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{ |
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if (!ftrace->func_irq_info) |
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return 0; |
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if (write_tracing_option_file("irq-info", "1") < 0) |
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return -1; |
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return 0; |
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} |
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static int reset_tracing_cpu(void) |
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{ |
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struct perf_cpu_map *cpumap = perf_cpu_map__new(NULL); |
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int ret; |
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ret = set_tracing_cpumask(cpumap); |
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perf_cpu_map__put(cpumap); |
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return ret; |
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} |
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static int __set_tracing_filter(const char *filter_file, struct list_head *funcs) |
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{ |
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struct filter_entry *pos; |
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|
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list_for_each_entry(pos, funcs, list) { |
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if (append_tracing_file(filter_file, pos->name) < 0) |
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return -1; |
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} |
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|
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return 0; |
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} |
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static int set_tracing_filters(struct perf_ftrace *ftrace) |
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{ |
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int ret; |
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|
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ret = __set_tracing_filter("set_ftrace_filter", &ftrace->filters); |
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if (ret < 0) |
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return ret; |
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|
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ret = __set_tracing_filter("set_ftrace_notrace", &ftrace->notrace); |
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if (ret < 0) |
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return ret; |
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ret = __set_tracing_filter("set_graph_function", &ftrace->graph_funcs); |
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if (ret < 0) |
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return ret; |
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|
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/* old kernels do not have this filter */ |
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__set_tracing_filter("set_graph_notrace", &ftrace->nograph_funcs); |
|
|
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return ret; |
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} |
|
|
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static void reset_tracing_filters(void) |
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{ |
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write_tracing_file("set_ftrace_filter", " "); |
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write_tracing_file("set_ftrace_notrace", " "); |
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write_tracing_file("set_graph_function", " "); |
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write_tracing_file("set_graph_notrace", " "); |
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} |
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static int set_tracing_depth(struct perf_ftrace *ftrace) |
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{ |
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if (ftrace->graph_depth == 0) |
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return 0; |
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|
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if (ftrace->graph_depth < 0) { |
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pr_err("invalid graph depth: %d\n", ftrace->graph_depth); |
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return -1; |
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} |
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if (write_tracing_file_int("max_graph_depth", ftrace->graph_depth) < 0) |
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return -1; |
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|
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return 0; |
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} |
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|
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static int set_tracing_percpu_buffer_size(struct perf_ftrace *ftrace) |
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{ |
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int ret; |
|
|
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if (ftrace->percpu_buffer_size == 0) |
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return 0; |
|
|
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ret = write_tracing_file_int("buffer_size_kb", |
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ftrace->percpu_buffer_size / 1024); |
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if (ret < 0) |
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return ret; |
|
|
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return 0; |
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} |
|
|
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static int set_tracing_trace_inherit(struct perf_ftrace *ftrace) |
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{ |
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if (!ftrace->inherit) |
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return 0; |
|
|
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if (write_tracing_option_file("function-fork", "1") < 0) |
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return -1; |
|
|
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return 0; |
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} |
|
|
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static int set_tracing_sleep_time(struct perf_ftrace *ftrace) |
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{ |
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if (!ftrace->graph_nosleep_time) |
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return 0; |
|
|
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if (write_tracing_option_file("sleep-time", "0") < 0) |
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return -1; |
|
|
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return 0; |
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} |
|
|
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static int set_tracing_funcgraph_irqs(struct perf_ftrace *ftrace) |
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{ |
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if (!ftrace->graph_noirqs) |
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return 0; |
|
|
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if (write_tracing_option_file("funcgraph-irqs", "0") < 0) |
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return -1; |
|
|
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return 0; |
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} |
|
|
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static int set_tracing_funcgraph_verbose(struct perf_ftrace *ftrace) |
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{ |
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if (!ftrace->graph_verbose) |
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return 0; |
|
|
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if (write_tracing_option_file("funcgraph-proc", "1") < 0) |
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return -1; |
|
|
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if (write_tracing_option_file("funcgraph-abstime", "1") < 0) |
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return -1; |
|
|
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if (write_tracing_option_file("latency-format", "1") < 0) |
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return -1; |
|
|
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return 0; |
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} |
|
|
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static int set_tracing_thresh(struct perf_ftrace *ftrace) |
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{ |
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int ret; |
|
|
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if (ftrace->graph_thresh == 0) |
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return 0; |
|
|
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ret = write_tracing_file_int("tracing_thresh", ftrace->graph_thresh); |
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if (ret < 0) |
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return ret; |
|
|
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return 0; |
|
} |
|
|
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static int set_tracing_options(struct perf_ftrace *ftrace) |
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{ |
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if (set_tracing_pid(ftrace) < 0) { |
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pr_err("failed to set ftrace pid\n"); |
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return -1; |
|
} |
|
|
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if (set_tracing_cpu(ftrace) < 0) { |
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pr_err("failed to set tracing cpumask\n"); |
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return -1; |
|
} |
|
|
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if (set_tracing_func_stack_trace(ftrace) < 0) { |
|
pr_err("failed to set tracing option func_stack_trace\n"); |
|
return -1; |
|
} |
|
|
|
if (set_tracing_func_irqinfo(ftrace) < 0) { |
|
pr_err("failed to set tracing option irq-info\n"); |
|
return -1; |
|
} |
|
|
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if (set_tracing_filters(ftrace) < 0) { |
|
pr_err("failed to set tracing filters\n"); |
|
return -1; |
|
} |
|
|
|
if (set_tracing_depth(ftrace) < 0) { |
|
pr_err("failed to set graph depth\n"); |
|
return -1; |
|
} |
|
|
|
if (set_tracing_percpu_buffer_size(ftrace) < 0) { |
|
pr_err("failed to set tracing per-cpu buffer size\n"); |
|
return -1; |
|
} |
|
|
|
if (set_tracing_trace_inherit(ftrace) < 0) { |
|
pr_err("failed to set tracing option function-fork\n"); |
|
return -1; |
|
} |
|
|
|
if (set_tracing_sleep_time(ftrace) < 0) { |
|
pr_err("failed to set tracing option sleep-time\n"); |
|
return -1; |
|
} |
|
|
|
if (set_tracing_funcgraph_irqs(ftrace) < 0) { |
|
pr_err("failed to set tracing option funcgraph-irqs\n"); |
|
return -1; |
|
} |
|
|
|
if (set_tracing_funcgraph_verbose(ftrace) < 0) { |
|
pr_err("failed to set tracing option funcgraph-proc/funcgraph-abstime\n"); |
|
return -1; |
|
} |
|
|
|
if (set_tracing_thresh(ftrace) < 0) { |
|
pr_err("failed to set tracing thresh\n"); |
|
return -1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) |
|
{ |
|
char *trace_file; |
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int trace_fd; |
|
char buf[4096]; |
|
struct pollfd pollfd = { |
|
.events = POLLIN, |
|
}; |
|
|
|
if (!(perf_cap__capable(CAP_PERFMON) || |
|
perf_cap__capable(CAP_SYS_ADMIN))) { |
|
pr_err("ftrace only works for %s!\n", |
|
#ifdef HAVE_LIBCAP_SUPPORT |
|
"users with the CAP_PERFMON or CAP_SYS_ADMIN capability" |
|
#else |
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"root" |
|
#endif |
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); |
|
return -1; |
|
} |
|
|
|
signal(SIGINT, sig_handler); |
|
signal(SIGUSR1, sig_handler); |
|
signal(SIGCHLD, sig_handler); |
|
signal(SIGPIPE, sig_handler); |
|
|
|
if (reset_tracing_files(ftrace) < 0) { |
|
pr_err("failed to reset ftrace\n"); |
|
goto out; |
|
} |
|
|
|
/* reset ftrace buffer */ |
|
if (write_tracing_file("trace", "0") < 0) |
|
goto out; |
|
|
|
if (argc && evlist__prepare_workload(ftrace->evlist, &ftrace->target, argv, false, |
|
ftrace__workload_exec_failed_signal) < 0) { |
|
goto out; |
|
} |
|
|
|
if (set_tracing_options(ftrace) < 0) |
|
goto out_reset; |
|
|
|
if (write_tracing_file("current_tracer", ftrace->tracer) < 0) { |
|
pr_err("failed to set current_tracer to %s\n", ftrace->tracer); |
|
goto out_reset; |
|
} |
|
|
|
setup_pager(); |
|
|
|
trace_file = get_tracing_file("trace_pipe"); |
|
if (!trace_file) { |
|
pr_err("failed to open trace_pipe\n"); |
|
goto out_reset; |
|
} |
|
|
|
trace_fd = open(trace_file, O_RDONLY); |
|
|
|
put_tracing_file(trace_file); |
|
|
|
if (trace_fd < 0) { |
|
pr_err("failed to open trace_pipe\n"); |
|
goto out_reset; |
|
} |
|
|
|
fcntl(trace_fd, F_SETFL, O_NONBLOCK); |
|
pollfd.fd = trace_fd; |
|
|
|
/* display column headers */ |
|
read_tracing_file_to_stdout("trace"); |
|
|
|
if (!ftrace->initial_delay) { |
|
if (write_tracing_file("tracing_on", "1") < 0) { |
|
pr_err("can't enable tracing\n"); |
|
goto out_close_fd; |
|
} |
|
} |
|
|
|
evlist__start_workload(ftrace->evlist); |
|
|
|
if (ftrace->initial_delay) { |
|
usleep(ftrace->initial_delay * 1000); |
|
if (write_tracing_file("tracing_on", "1") < 0) { |
|
pr_err("can't enable tracing\n"); |
|
goto out_close_fd; |
|
} |
|
} |
|
|
|
while (!done) { |
|
if (poll(&pollfd, 1, -1) < 0) |
|
break; |
|
|
|
if (pollfd.revents & POLLIN) { |
|
int n = read(trace_fd, buf, sizeof(buf)); |
|
if (n < 0) |
|
break; |
|
if (fwrite(buf, n, 1, stdout) != 1) |
|
break; |
|
} |
|
} |
|
|
|
write_tracing_file("tracing_on", "0"); |
|
|
|
if (workload_exec_errno) { |
|
const char *emsg = str_error_r(workload_exec_errno, buf, sizeof(buf)); |
|
/* flush stdout first so below error msg appears at the end. */ |
|
fflush(stdout); |
|
pr_err("workload failed: %s\n", emsg); |
|
goto out_close_fd; |
|
} |
|
|
|
/* read remaining buffer contents */ |
|
while (true) { |
|
int n = read(trace_fd, buf, sizeof(buf)); |
|
if (n <= 0) |
|
break; |
|
if (fwrite(buf, n, 1, stdout) != 1) |
|
break; |
|
} |
|
|
|
out_close_fd: |
|
close(trace_fd); |
|
out_reset: |
|
reset_tracing_files(ftrace); |
|
out: |
|
return (done && !workload_exec_errno) ? 0 : -1; |
|
} |
|
|
|
static int perf_ftrace_config(const char *var, const char *value, void *cb) |
|
{ |
|
struct perf_ftrace *ftrace = cb; |
|
|
|
if (!strstarts(var, "ftrace.")) |
|
return 0; |
|
|
|
if (strcmp(var, "ftrace.tracer")) |
|
return -1; |
|
|
|
if (!strcmp(value, "function_graph") || |
|
!strcmp(value, "function")) { |
|
ftrace->tracer = value; |
|
return 0; |
|
} |
|
|
|
pr_err("Please select \"function_graph\" (default) or \"function\"\n"); |
|
return -1; |
|
} |
|
|
|
static void list_function_cb(char *str, void *arg) |
|
{ |
|
struct strfilter *filter = (struct strfilter *)arg; |
|
|
|
if (strfilter__compare(filter, str)) |
|
printf("%s", str); |
|
} |
|
|
|
static int opt_list_avail_functions(const struct option *opt __maybe_unused, |
|
const char *str, int unset) |
|
{ |
|
struct strfilter *filter; |
|
const char *err = NULL; |
|
int ret; |
|
|
|
if (unset || !str) |
|
return -1; |
|
|
|
filter = strfilter__new(str, &err); |
|
if (!filter) |
|
return err ? -EINVAL : -ENOMEM; |
|
|
|
ret = strfilter__or(filter, str, &err); |
|
if (ret == -EINVAL) { |
|
pr_err("Filter parse error at %td.\n", err - str + 1); |
|
pr_err("Source: \"%s\"\n", str); |
|
pr_err(" %*c\n", (int)(err - str + 1), '^'); |
|
strfilter__delete(filter); |
|
return ret; |
|
} |
|
|
|
ret = read_tracing_file_by_line("available_filter_functions", |
|
list_function_cb, filter); |
|
strfilter__delete(filter); |
|
if (ret < 0) |
|
return ret; |
|
|
|
exit(0); |
|
} |
|
|
|
static int parse_filter_func(const struct option *opt, const char *str, |
|
int unset __maybe_unused) |
|
{ |
|
struct list_head *head = opt->value; |
|
struct filter_entry *entry; |
|
|
|
entry = malloc(sizeof(*entry) + strlen(str) + 1); |
|
if (entry == NULL) |
|
return -ENOMEM; |
|
|
|
strcpy(entry->name, str); |
|
list_add_tail(&entry->list, head); |
|
|
|
return 0; |
|
} |
|
|
|
static void delete_filter_func(struct list_head *head) |
|
{ |
|
struct filter_entry *pos, *tmp; |
|
|
|
list_for_each_entry_safe(pos, tmp, head, list) { |
|
list_del_init(&pos->list); |
|
free(pos); |
|
} |
|
} |
|
|
|
static int parse_buffer_size(const struct option *opt, |
|
const char *str, int unset) |
|
{ |
|
unsigned long *s = (unsigned long *)opt->value; |
|
static struct parse_tag tags_size[] = { |
|
{ .tag = 'B', .mult = 1 }, |
|
{ .tag = 'K', .mult = 1 << 10 }, |
|
{ .tag = 'M', .mult = 1 << 20 }, |
|
{ .tag = 'G', .mult = 1 << 30 }, |
|
{ .tag = 0 }, |
|
}; |
|
unsigned long val; |
|
|
|
if (unset) { |
|
*s = 0; |
|
return 0; |
|
} |
|
|
|
val = parse_tag_value(str, tags_size); |
|
if (val != (unsigned long) -1) { |
|
if (val < 1024) { |
|
pr_err("buffer size too small, must larger than 1KB."); |
|
return -1; |
|
} |
|
*s = val; |
|
return 0; |
|
} |
|
|
|
return -1; |
|
} |
|
|
|
static int parse_func_tracer_opts(const struct option *opt, |
|
const char *str, int unset) |
|
{ |
|
int ret; |
|
struct perf_ftrace *ftrace = (struct perf_ftrace *) opt->value; |
|
struct sublevel_option func_tracer_opts[] = { |
|
{ .name = "call-graph", .value_ptr = &ftrace->func_stack_trace }, |
|
{ .name = "irq-info", .value_ptr = &ftrace->func_irq_info }, |
|
{ .name = NULL, } |
|
}; |
|
|
|
if (unset) |
|
return 0; |
|
|
|
ret = perf_parse_sublevel_options(str, func_tracer_opts); |
|
if (ret) |
|
return ret; |
|
|
|
return 0; |
|
} |
|
|
|
static int parse_graph_tracer_opts(const struct option *opt, |
|
const char *str, int unset) |
|
{ |
|
int ret; |
|
struct perf_ftrace *ftrace = (struct perf_ftrace *) opt->value; |
|
struct sublevel_option graph_tracer_opts[] = { |
|
{ .name = "nosleep-time", .value_ptr = &ftrace->graph_nosleep_time }, |
|
{ .name = "noirqs", .value_ptr = &ftrace->graph_noirqs }, |
|
{ .name = "verbose", .value_ptr = &ftrace->graph_verbose }, |
|
{ .name = "thresh", .value_ptr = &ftrace->graph_thresh }, |
|
{ .name = "depth", .value_ptr = &ftrace->graph_depth }, |
|
{ .name = NULL, } |
|
}; |
|
|
|
if (unset) |
|
return 0; |
|
|
|
ret = perf_parse_sublevel_options(str, graph_tracer_opts); |
|
if (ret) |
|
return ret; |
|
|
|
return 0; |
|
} |
|
|
|
static void select_tracer(struct perf_ftrace *ftrace) |
|
{ |
|
bool graph = !list_empty(&ftrace->graph_funcs) || |
|
!list_empty(&ftrace->nograph_funcs); |
|
bool func = !list_empty(&ftrace->filters) || |
|
!list_empty(&ftrace->notrace); |
|
|
|
/* The function_graph has priority over function tracer. */ |
|
if (graph) |
|
ftrace->tracer = "function_graph"; |
|
else if (func) |
|
ftrace->tracer = "function"; |
|
/* Otherwise, the default tracer is used. */ |
|
|
|
pr_debug("%s tracer is used\n", ftrace->tracer); |
|
} |
|
|
|
int cmd_ftrace(int argc, const char **argv) |
|
{ |
|
int ret; |
|
struct perf_ftrace ftrace = { |
|
.tracer = DEFAULT_TRACER, |
|
.target = { .uid = UINT_MAX, }, |
|
}; |
|
const char * const ftrace_usage[] = { |
|
"perf ftrace [<options>] [<command>]", |
|
"perf ftrace [<options>] -- <command> [<options>]", |
|
NULL |
|
}; |
|
const struct option ftrace_options[] = { |
|
OPT_STRING('t', "tracer", &ftrace.tracer, "tracer", |
|
"Tracer to use: function_graph(default) or function"), |
|
OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]", |
|
"Show available functions to filter", |
|
opt_list_avail_functions, "*"), |
|
OPT_STRING('p', "pid", &ftrace.target.pid, "pid", |
|
"Trace on existing process id"), |
|
/* TODO: Add short option -t after -t/--tracer can be removed. */ |
|
OPT_STRING(0, "tid", &ftrace.target.tid, "tid", |
|
"Trace on existing thread id (exclusive to --pid)"), |
|
OPT_INCR('v', "verbose", &verbose, |
|
"Be more verbose"), |
|
OPT_BOOLEAN('a', "all-cpus", &ftrace.target.system_wide, |
|
"System-wide collection from all CPUs"), |
|
OPT_STRING('C', "cpu", &ftrace.target.cpu_list, "cpu", |
|
"List of cpus to monitor"), |
|
OPT_CALLBACK('T', "trace-funcs", &ftrace.filters, "func", |
|
"Trace given functions using function tracer", |
|
parse_filter_func), |
|
OPT_CALLBACK('N', "notrace-funcs", &ftrace.notrace, "func", |
|
"Do not trace given functions", parse_filter_func), |
|
OPT_CALLBACK(0, "func-opts", &ftrace, "options", |
|
"Function tracer options, available options: call-graph,irq-info", |
|
parse_func_tracer_opts), |
|
OPT_CALLBACK('G', "graph-funcs", &ftrace.graph_funcs, "func", |
|
"Trace given functions using function_graph tracer", |
|
parse_filter_func), |
|
OPT_CALLBACK('g', "nograph-funcs", &ftrace.nograph_funcs, "func", |
|
"Set nograph filter on given functions", parse_filter_func), |
|
OPT_CALLBACK(0, "graph-opts", &ftrace, "options", |
|
"Graph tracer options, available options: nosleep-time,noirqs,verbose,thresh=<n>,depth=<n>", |
|
parse_graph_tracer_opts), |
|
OPT_CALLBACK('m', "buffer-size", &ftrace.percpu_buffer_size, "size", |
|
"Size of per cpu buffer, needs to use a B, K, M or G suffix.", parse_buffer_size), |
|
OPT_BOOLEAN(0, "inherit", &ftrace.inherit, |
|
"Trace children processes"), |
|
OPT_UINTEGER('D', "delay", &ftrace.initial_delay, |
|
"Number of milliseconds to wait before starting tracing after program start"), |
|
OPT_END() |
|
}; |
|
|
|
INIT_LIST_HEAD(&ftrace.filters); |
|
INIT_LIST_HEAD(&ftrace.notrace); |
|
INIT_LIST_HEAD(&ftrace.graph_funcs); |
|
INIT_LIST_HEAD(&ftrace.nograph_funcs); |
|
|
|
ret = perf_config(perf_ftrace_config, &ftrace); |
|
if (ret < 0) |
|
return -1; |
|
|
|
argc = parse_options(argc, argv, ftrace_options, ftrace_usage, |
|
PARSE_OPT_STOP_AT_NON_OPTION); |
|
if (!argc && target__none(&ftrace.target)) |
|
ftrace.target.system_wide = true; |
|
|
|
select_tracer(&ftrace); |
|
|
|
ret = target__validate(&ftrace.target); |
|
if (ret) { |
|
char errbuf[512]; |
|
|
|
target__strerror(&ftrace.target, ret, errbuf, 512); |
|
pr_err("%s\n", errbuf); |
|
goto out_delete_filters; |
|
} |
|
|
|
ftrace.evlist = evlist__new(); |
|
if (ftrace.evlist == NULL) { |
|
ret = -ENOMEM; |
|
goto out_delete_filters; |
|
} |
|
|
|
ret = evlist__create_maps(ftrace.evlist, &ftrace.target); |
|
if (ret < 0) |
|
goto out_delete_evlist; |
|
|
|
ret = __cmd_ftrace(&ftrace, argc, argv); |
|
|
|
out_delete_evlist: |
|
evlist__delete(ftrace.evlist); |
|
|
|
out_delete_filters: |
|
delete_filter_func(&ftrace.filters); |
|
delete_filter_func(&ftrace.notrace); |
|
delete_filter_func(&ftrace.graph_funcs); |
|
delete_filter_func(&ftrace.nograph_funcs); |
|
|
|
return ret; |
|
}
|
|
|