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Add the atrace utility.

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This change adds a new system binary to help with capturing and dumping
kernel traces.

Change-Id: If2fc074480f822588a4c171312dc4c04fd305356
This commit is contained in:
Jamie Gennis 2012-02-23 14:16:05 -08:00
parent fcfe48e7cf
commit fb31ba6928
4 changed files with 506 additions and 0 deletions
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cmds/atrace/Android.mk Normal file
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# Copyright 2012 The Android Open Source Project
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= atrace.c
LOCAL_MODULE:= atrace
LOCAL_MODULE_TAGS:= optional
include $(BUILD_EXECUTABLE)

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cmds/atrace/MODULE_LICENSE_APACHE2 Normal file
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cmds/atrace/NOTICE Normal file
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Copyright (c) 2012, The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
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cmds/atrace/atrace.c Normal file
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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/sendfile.h>
#include <time.h>
/* Command line options */
static int g_traceDurationSeconds = 5;
static bool g_traceSchedSwitch = false;
static bool g_traceWorkqueue = false;
static bool g_traceOverwrite = false;
/* Global state */
static bool g_traceAborted = false;
/* Sys file paths */
static const char* k_traceClockPath =
"/sys/kernel/debug/tracing/trace_clock";
static const char* k_tracingOverwriteEnablePath =
"/sys/kernel/debug/tracing/options/overwrite";
static const char* k_schedSwitchEnablePath =
"/sys/kernel/debug/tracing/events/sched/sched_switch/enable";
static const char* k_workqueueEnablePath =
"/sys/kernel/debug/tracing/events/workqueue/enable";
static const char* k_tracingOnPath =
"/sys/kernel/debug/tracing/tracing_on";
static const char* k_tracePath =
"/sys/kernel/debug/tracing/trace";
static const char* k_traceMarkerPath =
"/sys/kernel/debug/tracing/trace_marker";
// Write a string to a file, returning true if the write was successful.
bool writeStr(const char* filename, const char* str)
{
int fd = open(filename, O_WRONLY);
if (fd == -1) {
fprintf(stderr, "error opening %s: %s (%d)\n", filename,
strerror(errno), errno);
return false;
}
bool ok = true;
ssize_t len = strlen(str);
if (write(fd, str, len) != len) {
fprintf(stderr, "error writing to %s: %s (%d)\n", filename,
strerror(errno), errno);
ok = false;
}
close(fd);
return ok;
}
// Enable or disable a kernel option by writing a "1" or a "0" into a /sys file.
static bool setKernelOptionEnable(const char* filename, bool enable)
{
return writeStr(filename, enable ? "1" : "0");
}
// Enable or disable overwriting of the kernel trace buffers. Disabling this
// will cause tracing to stop once the trace buffers have filled up.
static bool setTraceOverwriteEnable(bool enable)
{
return setKernelOptionEnable(k_tracingOverwriteEnablePath, enable);
}
// Enable or disable tracing of the kernel scheduler switching.
static bool setSchedSwitchTracingEnable(bool enable)
{
return setKernelOptionEnable(k_schedSwitchEnablePath, enable);
}
// Enable or disable tracing of the kernel workqueues.
static bool setWorkqueueTracingEnabled(bool enable)
{
return setKernelOptionEnable(k_workqueueEnablePath, enable);
}
// Enable or disable kernel tracing.
static bool setTracingEnabled(bool enable)
{
return setKernelOptionEnable(k_tracingOnPath, enable);
}
// Clear the contents of the kernel trace.
static bool clearTrace()
{
int traceFD = creat(k_tracePath, 0);
if (traceFD == -1) {
fprintf(stderr, "error truncating %s: %s (%d)\n", k_tracePath,
strerror(errno), errno);
return false;
}
close(traceFD);
return true;
}
// Enable or disable the kernel's use of the global clock. Disabling the global
// clock will result in the kernel using a per-CPU local clock.
static bool setGlobalClockEnable(bool enable)
{
return writeStr(k_traceClockPath, enable ? "global" : "local");
}
// Enable tracing in the kernel.
static bool startTrace()
{
bool ok = true;
// Set up the tracing options.
ok &= setTraceOverwriteEnable(g_traceOverwrite);
ok &= setSchedSwitchTracingEnable(g_traceSchedSwitch);
ok &= setWorkqueueTracingEnabled(g_traceWorkqueue);
ok &= setGlobalClockEnable(true);
// Enable tracing.
ok &= setTracingEnabled(true);
if (!ok) {
fprintf(stderr, "error: unable to start trace\n");
}
return ok;
}
// Disable tracing in the kernel.
static void stopTrace()
{
// Disable tracing.
setTracingEnabled(false);
// Set the options back to their defaults.
setTraceOverwriteEnable(true);
setSchedSwitchTracingEnable(false);
setWorkqueueTracingEnabled(false);
setGlobalClockEnable(false);
}
// Read the current kernel trace and write it to stdout.
static void dumpTrace()
{
int traceFD = open(k_tracePath, O_RDWR);
if (traceFD == -1) {
fprintf(stderr, "error opening %s: %s (%d)\n", k_tracePath,
strerror(errno), errno);
return;
}
ssize_t sent = 0;
while ((sent = sendfile(STDOUT_FILENO, traceFD, NULL, 64*1024*1024)) > 0);
if (sent == -1) {
fprintf(stderr, "error dumping trace: %s (%d)\n", strerror(errno),
errno);
}
close(traceFD);
}
// Print the command usage help to stderr.
static void showHelp(const char *cmd)
{
fprintf(stderr, "usage: %s [options]\n", cmd);
fprintf(stderr, "options include:\n"
" -c trace into a circular buffer\n"
" -s trace the kernel scheduler switches\n"
" -t N trace for N seconds [defualt 5]\n"
" -w trace the kernel workqueue\n");
}
static void handleSignal(int signo) {
g_traceAborted = true;
}
static void registerSigHandler() {
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = handleSignal;
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGQUIT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
}
int main(int argc, char **argv)
{
if (argc == 2 && 0 == strcmp(argv[1], "--help")) {
showHelp(argv[0]);
exit(0);
}
if (getuid() != 0) {
fprintf(stderr, "error: %s must be run as root.", argv[0]);
}
for (;;) {
int ret;
ret = getopt(argc, argv, "cst:w");
if (ret < 0) {
break;
}
switch(ret) {
case 'c':
g_traceOverwrite = true;
break;
case 's':
g_traceSchedSwitch = true;
break;
case 't':
g_traceDurationSeconds = atoi(optarg);
break;
case 'w':
g_traceWorkqueue = true;
break;
default:
showHelp(argv[0]);
exit(-1);
break;
}
}
registerSigHandler();
bool ok = startTrace();
if (ok) {
printf("capturing trace...");
fflush(stdout);
// We clear the trace after starting it because tracing gets enabled for
// each CPU individually in the kernel. Having the beginning of the trace
// contain entries from only one CPU can cause "begin" entries without a
// matching "end" entry to show up if a task gets migrated from one CPU to
// another.
ok = clearTrace();
if (ok) {
// Sleep to allow the trace to be captured.
struct timespec timeLeft;
timeLeft.tv_sec = g_traceDurationSeconds;
timeLeft.tv_nsec = 0;
do {
if (g_traceAborted) {
break;
}
} while (nanosleep(&timeLeft, &timeLeft) == -1 && errno == EINTR);
}
}
// Stop the trace and restore the default settings.
stopTrace();
if (ok) {
if (!g_traceAborted) {
printf(" done\nTRACE:\n");
fflush(stdout);
dumpTrace();
} else {
printf("\ntrace aborted.\n");
fflush(stdout);
}
clearTrace();
} else {
fprintf(stderr, "unable to start tracing\n");
}
return g_traceAborted ? 1 : 0;
}