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Merge atrace/ from platform/system/extras to cmds/atrace/

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Chad Jones 2012-11-29 14:35:10 -08:00
commit 9a57c5c69b
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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_C_INCLUDES += external/zlib
LOCAL_CFLAGS += -std=c99
LOCAL_MODULE:= atrace
LOCAL_MODULE_TAGS:= optional
LOCAL_SHARED_LIBRARIES := libz
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,
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.
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
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"Work" shall mean the work of authorship, whether in Source or
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4. Redistribution. You may reproduce and distribute copies of the
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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 <getopt.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/sendfile.h>
#include <time.h>
#include <zlib.h>
#define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))
/* Command line options */
static int g_traceDurationSeconds = 5;
static bool g_traceSchedSwitch = false;
static bool g_traceFrequency = false;
static bool g_traceBusUtilization = false;
static bool g_traceCpuIdle = false;
static bool g_traceDisk = false;
static bool g_traceGovernorLoad = false;
static bool g_traceSync = false;
static bool g_traceWorkqueue = false;
static bool g_traceOverwrite = false;
static int g_traceBufferSizeKB = 2048;
static bool g_compress = false;
static bool g_nohup = false;
static int g_initialSleepSecs = 0;
/* 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_traceBufferSizePath =
"/sys/kernel/debug/tracing/buffer_size_kb";
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_schedWakeupEnablePath =
"/sys/kernel/debug/tracing/events/sched/sched_wakeup/enable";
static const char* k_memoryBusEnablePath =
"/sys/kernel/debug/tracing/events/memory_bus/enable";
static const char* k_cpuFreqEnablePath =
"/sys/kernel/debug/tracing/events/power/cpu_frequency/enable";
static const char *k_clockSetRateEnablePath =
"/sys/kernel/debug/tracing/events/power/clock_set_rate/enable";
static const char* k_cpuIdleEnablePath =
"/sys/kernel/debug/tracing/events/power/cpu_idle/enable";
static const char* k_governorLoadEnablePath =
"/sys/kernel/debug/tracing/events/cpufreq_interactive/enable";
static const char* k_syncEnablePath =
"/sys/kernel/debug/tracing/events/sync/enable";
static const char* k_workqueueEnablePath =
"/sys/kernel/debug/tracing/events/workqueue/enable";
static const char* k_diskEnablePaths[] = {
"/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable",
"/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable",
"/sys/kernel/debug/tracing/events/block/block_rq_issue/enable",
"/sys/kernel/debug/tracing/events/block/block_rq_complete/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";
// Check whether a file exists.
static bool fileExists(const char* filename) {
return access(filename, F_OK) != -1;
}
// 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 a collection of kernel options by writing a "1" or a "0" into each /sys file.
static bool setMultipleKernelOptionsEnable(const char** filenames, size_t count, bool enable)
{
bool result = true;
for (size_t i = 0; i < count; i++) {
result &= setKernelOptionEnable(filenames[i], enable);
}
return result;
}
// 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)
{
bool ok = true;
ok &= setKernelOptionEnable(k_schedSwitchEnablePath, enable);
ok &= setKernelOptionEnable(k_schedWakeupEnablePath, enable);
return ok;
}
// Enable or disable tracing of the Bus utilization.
static bool setBusUtilizationTracingEnable(bool enable)
{
bool ok = true, oneSet = false;
// these can be platform specific so make sure that at least
// one succeeds.
if (fileExists(k_memoryBusEnablePath)) {
ok &= setKernelOptionEnable(k_memoryBusEnablePath, enable);
oneSet |= ok;
}
return ok && (oneSet || !enable);
}
// Enable or disable tracing of the CPU clock frequency.
static bool setFrequencyTracingEnable(bool enable)
{
bool ok = true;
ok &= setKernelOptionEnable(k_cpuFreqEnablePath, enable);
if (fileExists(k_clockSetRateEnablePath)) {
ok &= setKernelOptionEnable(k_clockSetRateEnablePath, enable);
}
return ok;
}
// Enable or disable tracing of CPU idle events.
static bool setCpuIdleTracingEnable(bool enable)
{
return setKernelOptionEnable(k_cpuIdleEnablePath, enable);
}
// Enable or disable tracing of the interactive CPU frequency governor's idea of
// the CPU load.
static bool setGovernorLoadTracingEnable(bool enable)
{
bool ok = true;
if (fileExists(k_governorLoadEnablePath) || enable) {
ok &= setKernelOptionEnable(k_governorLoadEnablePath, enable);
}
return ok;
}
// Enable or disable tracing of sync timelines and waits.
static bool setSyncTracingEnabled(bool enable)
{
bool ok = true;
if (fileExists(k_syncEnablePath) || enable) {
ok &= setKernelOptionEnable(k_syncEnablePath, enable);
}
return ok;
}
// Enable or disable tracing of the kernel workqueues.
static bool setWorkqueueTracingEnabled(bool enable)
{
return setKernelOptionEnable(k_workqueueEnablePath, enable);
}
// Enable or disable tracing of disk I/O.
static bool setDiskTracingEnabled(bool enable)
{
return setMultipleKernelOptionsEnable(k_diskEnablePaths, NELEM(k_diskEnablePaths), 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;
}
// Set the size of the kernel's trace buffer in kilobytes.
static bool setTraceBufferSizeKB(int size)
{
char str[32] = "1";
int len;
if (size < 1) {
size = 1;
}
snprintf(str, 32, "%d", size);
return writeStr(k_traceBufferSizePath, str);
}
// 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 isRoot)
{
bool ok = true;
// Set up the tracing options that don't require root.
ok &= setTraceOverwriteEnable(g_traceOverwrite);
ok &= setSchedSwitchTracingEnable(g_traceSchedSwitch);
ok &= setFrequencyTracingEnable(g_traceFrequency);
ok &= setCpuIdleTracingEnable(g_traceCpuIdle);
ok &= setGovernorLoadTracingEnable(g_traceGovernorLoad);
ok &= setTraceBufferSizeKB(g_traceBufferSizeKB);
ok &= setGlobalClockEnable(true);
// Set up the tracing options that do require root. The options that
// require root should have errored out earlier if we're not running as
// root.
if (isRoot) {
ok &= setBusUtilizationTracingEnable(g_traceBusUtilization);
ok &= setSyncTracingEnabled(g_traceSync);
ok &= setWorkqueueTracingEnabled(g_traceWorkqueue);
ok &= setDiskTracingEnabled(g_traceDisk);
}
// 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(bool isRoot)
{
// Disable tracing.
setTracingEnabled(false);
// Set the options back to their defaults.
setTraceOverwriteEnable(true);
setSchedSwitchTracingEnable(false);
setFrequencyTracingEnable(false);
setGovernorLoadTracingEnable(false);
setGlobalClockEnable(false);
if (isRoot) {
setBusUtilizationTracingEnable(false);
setSyncTracingEnabled(false);
setWorkqueueTracingEnabled(false);
setDiskTracingEnabled(false);
}
// Note that we can't reset the trace buffer size here because that would
// clear the trace before we've read it.
}
// 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;
}
if (g_compress) {
z_stream zs;
uint8_t *in, *out;
int result, flush;
bzero(&zs, sizeof(zs));
result = deflateInit(&zs, Z_DEFAULT_COMPRESSION);
if (result != Z_OK) {
fprintf(stderr, "error initializing zlib: %d\n", result);
close(traceFD);
return;
}
const size_t bufSize = 64*1024;
in = (uint8_t*)malloc(bufSize);
out = (uint8_t*)malloc(bufSize);
flush = Z_NO_FLUSH;
zs.next_out = out;
zs.avail_out = bufSize;
do {
if (zs.avail_in == 0) {
// More input is needed.
result = read(traceFD, in, bufSize);
if (result < 0) {
fprintf(stderr, "error reading trace: %s (%d)\n",
strerror(errno), errno);
result = Z_STREAM_END;
break;
} else if (result == 0) {
flush = Z_FINISH;
} else {
zs.next_in = in;
zs.avail_in = result;
}
}
if (zs.avail_out == 0) {
// Need to write the output.
result = write(STDOUT_FILENO, out, bufSize);
if ((size_t)result < bufSize) {
fprintf(stderr, "error writing deflated trace: %s (%d)\n",
strerror(errno), errno);
result = Z_STREAM_END; // skip deflate error message
zs.avail_out = bufSize; // skip the final write
break;
}
zs.next_out = out;
zs.avail_out = bufSize;
}
} while ((result = deflate(&zs, flush)) == Z_OK);
if (result != Z_STREAM_END) {
fprintf(stderr, "error deflating trace: %s\n", zs.msg);
}
if (zs.avail_out < bufSize) {
size_t bytes = bufSize - zs.avail_out;
result = write(STDOUT_FILENO, out, bytes);
if ((size_t)result < bytes) {
fprintf(stderr, "error writing deflated trace: %s (%d)\n",
strerror(errno), errno);
}
}
result = deflateEnd(&zs);
if (result != Z_OK) {
fprintf(stderr, "error cleaning up zlib: %d\n", result);
}
free(in);
free(out);
} else {
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"
" -b N use a trace buffer size of N KB\n"
" -c trace into a circular buffer\n"
" -d trace disk I/O\n"
" -f trace clock frequency changes\n"
" -l trace CPU frequency governor load\n"
" -s trace the kernel scheduler switches\n"
" -t N trace for N seconds [defualt 5]\n"
" -u trace bus utilization\n"
" -w trace the kernel workqueue\n"
" -y trace sync timelines and waits\n"
" -z compress the trace dump\n"
" --async_start start circular trace and return immediatly\n"
" --async_dump dump the current contents of circular trace buffer\n"
" --async_stop stop tracing and dump the current contents of circular\n"
" trace buffer\n"
);
}
static void handleSignal(int signo) {
if (!g_nohup) {
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)
{
bool isRoot = (getuid() == 0);
bool async = false;
bool traceStart = true;
bool traceStop = true;
bool traceDump = true;
if (argc == 2 && 0 == strcmp(argv[1], "--help")) {
showHelp(argv[0]);
exit(0);
}
for (;;) {
int ret;
int option_index = 0;
static struct option long_options[] = {
{"async_start", no_argument, 0, 0 },
{"async_stop", no_argument, 0, 0 },
{"async_dump", no_argument, 0, 0 },
{0, 0, 0, 0 }
};
ret = getopt_long(argc, argv, "b:cidflst:uwyznS:",
long_options, &option_index);
if (ret < 0) {
break;
}
switch(ret) {
case 'b':
g_traceBufferSizeKB = atoi(optarg);
break;
case 'c':
g_traceOverwrite = true;
break;
case 'i':
g_traceCpuIdle = true;
break;
case 'l':
g_traceGovernorLoad = true;
break;
case 'd':
if (!isRoot) {
fprintf(stderr, "error: tracing disk activity requires root privileges\n");
exit(1);
}
g_traceDisk = true;
break;
case 'f':
g_traceFrequency = true;
break;
case 'n':
g_nohup = true;
break;
case 's':
g_traceSchedSwitch = true;
break;
case 'S':
g_initialSleepSecs = atoi(optarg);
break;
case 't':
g_traceDurationSeconds = atoi(optarg);
break;
case 'u':
if (!isRoot) {
fprintf(stderr, "error: tracing bus utilization requires root privileges\n");
exit(1);
}
g_traceBusUtilization = true;
break;
case 'w':
if (!isRoot) {
fprintf(stderr, "error: tracing kernel work queues requires root privileges\n");
exit(1);
}
g_traceWorkqueue = true;
break;
case 'y':
if (!isRoot) {
fprintf(stderr, "error: tracing sync requires root privileges\n");
exit(1);
}
g_traceSync = true;
break;
case 'z':
g_compress = true;
break;
case 0:
if (!strcmp(long_options[option_index].name, "async_start")) {
async = true;
traceStop = false;
traceDump = false;
g_traceOverwrite = true;
} else if (!strcmp(long_options[option_index].name, "async_stop")) {
async = true;
traceStop = false;
} else if (!strcmp(long_options[option_index].name, "async_dump")) {
async = true;
traceStart = false;
traceStop = false;
}
break;
default:
fprintf(stderr, "\n");
showHelp(argv[0]);
exit(-1);
break;
}
}
registerSigHandler();
if (g_initialSleepSecs > 0) {
sleep(g_initialSleepSecs);
}
bool ok = startTrace(isRoot);
if (ok && traceStart) {
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 && !async) {
// 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.
if (traceStop)
stopTrace(isRoot);
if (ok && traceDump) {
if (!g_traceAborted) {
printf(" done\nTRACE:\n");
fflush(stdout);
dumpTrace();
} else {
printf("\ntrace aborted.\n");
fflush(stdout);
}
clearTrace();
} else if (!ok) {
fprintf(stderr, "unable to start tracing\n");
}
// Reset the trace buffer size to 1.
if (traceStop)
setTraceBufferSizeKB(1);
return g_traceAborted ? 1 : 0;
}