715 lines
22 KiB
C++
715 lines
22 KiB
C++
/*
|
|
* 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>
|
|
|
|
#include <binder/IBinder.h>
|
|
#include <binder/IServiceManager.h>
|
|
#include <binder/Parcel.h>
|
|
|
|
#include <cutils/properties.h>
|
|
|
|
#include <utils/String8.h>
|
|
#include <utils/Trace.h>
|
|
|
|
using namespace android;
|
|
|
|
#define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))
|
|
|
|
enum { MAX_SYS_FILES = 8 };
|
|
|
|
const char* k_traceTagsProperty = "debug.atrace.tags.enableflags";
|
|
|
|
typedef enum { OPT, REQ } requiredness ;
|
|
|
|
struct TracingCategory {
|
|
// The name identifying the category.
|
|
const char* name;
|
|
|
|
// A longer description of the category.
|
|
const char* longname;
|
|
|
|
// The userland tracing tags that the category enables.
|
|
uint64_t tags;
|
|
|
|
// The fname==NULL terminated list of /sys/ files that the category
|
|
// enables.
|
|
struct {
|
|
// Whether the file must be writable in order to enable the tracing
|
|
// category.
|
|
requiredness required;
|
|
|
|
// The path to the enable file.
|
|
const char* path;
|
|
} sysfiles[MAX_SYS_FILES];
|
|
};
|
|
|
|
/* Tracing categories */
|
|
static const TracingCategory k_categories[] = {
|
|
{ "gfx", "Graphics", ATRACE_TAG_GRAPHICS, { } },
|
|
{ "input", "Input", ATRACE_TAG_INPUT, { } },
|
|
{ "view", "View System", ATRACE_TAG_VIEW, { } },
|
|
{ "wm", "Window Manager", ATRACE_TAG_WINDOW_MANAGER, { } },
|
|
{ "am", "Activity Manager", ATRACE_TAG_ACTIVITY_MANAGER, { } },
|
|
{ "audio", "Audio", ATRACE_TAG_AUDIO, { } },
|
|
{ "video", "Video", ATRACE_TAG_VIDEO, { } },
|
|
{ "camera", "Camera", ATRACE_TAG_CAMERA, { } },
|
|
{ "hal", "Hardware Modules", ATRACE_TAG_HAL, { } },
|
|
{ "sched", "CPU Scheduling", 0, {
|
|
{ REQ, "/sys/kernel/debug/tracing/events/sched/sched_switch/enable" },
|
|
{ REQ, "/sys/kernel/debug/tracing/events/sched/sched_wakeup/enable" },
|
|
} },
|
|
{ "freq", "CPU Frequency", 0, {
|
|
{ REQ, "/sys/kernel/debug/tracing/events/power/cpu_frequency/enable" },
|
|
{ OPT, "/sys/kernel/debug/tracing/events/power/clock_set_rate/enable" },
|
|
} },
|
|
{ "membus", "Memory Bus Utilization", 0, {
|
|
{ REQ, "/sys/kernel/debug/tracing/events/memory_bus/enable" },
|
|
} },
|
|
{ "idle", "CPU Idle", 0, {
|
|
{ REQ, "/sys/kernel/debug/tracing/events/power/cpu_idle/enable" },
|
|
} },
|
|
{ "disk", "Disk I/O", 0, {
|
|
{ REQ, "/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable" },
|
|
{ REQ, "/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable" },
|
|
{ REQ, "/sys/kernel/debug/tracing/events/block/block_rq_issue/enable" },
|
|
{ REQ, "/sys/kernel/debug/tracing/events/block/block_rq_complete/enable" },
|
|
} },
|
|
{ "load", "CPU Load", 0, {
|
|
{ REQ, "/sys/kernel/debug/tracing/events/cpufreq_interactive/enable" },
|
|
} },
|
|
{ "sync", "Synchronization", 0, {
|
|
{ REQ, "/sys/kernel/debug/tracing/events/sync/enable" },
|
|
} },
|
|
{ "workq", "Kernel Workqueues", 0, {
|
|
{ REQ, "/sys/kernel/debug/tracing/events/workqueue/enable" },
|
|
} },
|
|
};
|
|
|
|
/* Command line options */
|
|
static int g_traceDurationSeconds = 5;
|
|
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;
|
|
static bool g_categoryEnables[NELEM(k_categories)] = {};
|
|
|
|
/* 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_tracingOnPath =
|
|
"/sys/kernel/debug/tracing/tracing_on";
|
|
|
|
static const char* k_tracePath =
|
|
"/sys/kernel/debug/tracing/trace";
|
|
|
|
// Check whether a file exists.
|
|
static bool fileExists(const char* filename) {
|
|
return access(filename, F_OK) != -1;
|
|
}
|
|
|
|
// Check whether a file is writable.
|
|
static bool fileIsWritable(const char* filename) {
|
|
return access(filename, W_OK) != -1;
|
|
}
|
|
|
|
// Write a string to a file, returning true if the write was successful.
|
|
static 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");
|
|
}
|
|
|
|
// Check whether the category is supported on the device with the current
|
|
// rootness. A category is supported only if all its required /sys/ files are
|
|
// writable and if enabling the category will enable one or more tracing tags
|
|
// or /sys/ files.
|
|
static bool isCategorySupported(const TracingCategory& category)
|
|
{
|
|
bool ok = category.tags != 0;
|
|
for (int i = 0; i < MAX_SYS_FILES; i++) {
|
|
const char* path = category.sysfiles[i].path;
|
|
bool req = category.sysfiles[i].required == REQ;
|
|
if (path != NULL) {
|
|
if (req) {
|
|
if (!fileIsWritable(path)) {
|
|
return false;
|
|
} else {
|
|
ok = true;
|
|
}
|
|
} else {
|
|
ok |= fileIsWritable(path);
|
|
}
|
|
}
|
|
}
|
|
return ok;
|
|
}
|
|
|
|
// Check whether the category would be supported on the device if the user
|
|
// were root. This function assumes that root is able to write to any file
|
|
// that exists. It performs the same logic as isCategorySupported, but it
|
|
// uses file existance rather than writability in the /sys/ file checks.
|
|
static bool isCategorySupportedForRoot(const TracingCategory& category)
|
|
{
|
|
bool ok = category.tags != 0;
|
|
for (int i = 0; i < MAX_SYS_FILES; i++) {
|
|
const char* path = category.sysfiles[i].path;
|
|
bool req = category.sysfiles[i].required == REQ;
|
|
if (path != NULL) {
|
|
if (req) {
|
|
if (!fileExists(path)) {
|
|
return false;
|
|
} else {
|
|
ok = true;
|
|
}
|
|
} else {
|
|
ok |= fileExists(path);
|
|
}
|
|
}
|
|
}
|
|
return ok;
|
|
}
|
|
|
|
// 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 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");
|
|
}
|
|
|
|
// Poke all the binder-enabled processes in the system to get them to re-read
|
|
// their system properties.
|
|
static bool pokeBinderServices()
|
|
{
|
|
sp<IServiceManager> sm = defaultServiceManager();
|
|
Vector<String16> services = sm->listServices();
|
|
for (size_t i = 0; i < services.size(); i++) {
|
|
sp<IBinder> obj = sm->checkService(services[i]);
|
|
if (obj != NULL) {
|
|
Parcel data;
|
|
if (obj->transact(IBinder::SYSPROPS_TRANSACTION, data,
|
|
NULL, 0) != OK) {
|
|
if (false) {
|
|
// XXX: For some reason this fails on tablets trying to
|
|
// poke the "phone" service. It's not clear whether some
|
|
// are expected to fail.
|
|
String8 svc(services[i]);
|
|
fprintf(stderr, "error poking binder service %s\n",
|
|
svc.string());
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Set the trace tags that userland tracing uses, and poke the running
|
|
// processes to pick up the new value.
|
|
static bool setTagsProperty(uint64_t tags)
|
|
{
|
|
char buf[64];
|
|
snprintf(buf, 64, "%#llx", tags);
|
|
if (property_set(k_traceTagsProperty, buf) < 0) {
|
|
fprintf(stderr, "error setting trace tags system property\n");
|
|
return false;
|
|
}
|
|
return pokeBinderServices();
|
|
}
|
|
|
|
// Disable all /sys/ enable files.
|
|
static bool disableKernelTraceEvents() {
|
|
bool ok = true;
|
|
for (int i = 0; i < NELEM(k_categories); i++) {
|
|
const TracingCategory &c = k_categories[i];
|
|
for (int j = 0; j < MAX_SYS_FILES; j++) {
|
|
const char* path = c.sysfiles[j].path;
|
|
if (path != NULL && fileIsWritable(path)) {
|
|
ok &= setKernelOptionEnable(path, false);
|
|
}
|
|
}
|
|
}
|
|
return ok;
|
|
}
|
|
|
|
// Enable tracing in the kernel.
|
|
static bool startTrace()
|
|
{
|
|
bool ok = true;
|
|
|
|
// Set up the tracing options.
|
|
ok &= setTraceOverwriteEnable(g_traceOverwrite);
|
|
ok &= setTraceBufferSizeKB(g_traceBufferSizeKB);
|
|
ok &= setGlobalClockEnable(true);
|
|
|
|
// Set up the tags property.
|
|
uint64_t tags = 0;
|
|
for (int i = 0; i < NELEM(k_categories); i++) {
|
|
if (g_categoryEnables[i]) {
|
|
const TracingCategory &c = k_categories[i];
|
|
tags |= c.tags;
|
|
}
|
|
}
|
|
ok &= setTagsProperty(tags);
|
|
|
|
// Disable all the sysfs enables. This is done as a separate loop from
|
|
// the enables to allow the same enable to exist in multiple categories.
|
|
ok &= disableKernelTraceEvents();
|
|
|
|
// Enable all the sysfs enables that are in an enabled category.
|
|
for (int i = 0; i < NELEM(k_categories); i++) {
|
|
if (g_categoryEnables[i]) {
|
|
const TracingCategory &c = k_categories[i];
|
|
for (int j = 0; j < MAX_SYS_FILES; j++) {
|
|
const char* path = c.sysfiles[j].path;
|
|
bool required = c.sysfiles[j].required == REQ;
|
|
if (path != NULL) {
|
|
if (fileIsWritable(path)) {
|
|
ok &= setKernelOptionEnable(path, true);
|
|
} else if (required) {
|
|
fprintf(stderr, "error writing file %s\n", path);
|
|
ok = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Enable tracing.
|
|
ok &= setTracingEnabled(true);
|
|
|
|
return ok;
|
|
}
|
|
|
|
// Disable tracing in the kernel.
|
|
static void stopTrace()
|
|
{
|
|
// Disable tracing.
|
|
setTracingEnabled(false);
|
|
|
|
// Disable all tracing that we're able to.
|
|
disableKernelTraceEvents();
|
|
|
|
// Disable all the trace tags.
|
|
setTagsProperty(0);
|
|
|
|
// Set the options back to their defaults.
|
|
setTraceOverwriteEnable(true);
|
|
setGlobalClockEnable(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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static bool setCategoryEnable(const char* name, bool enable)
|
|
{
|
|
for (int i = 0; i < NELEM(k_categories); i++) {
|
|
const TracingCategory& c = k_categories[i];
|
|
if (strcmp(name, c.name) == 0) {
|
|
if (isCategorySupported(c)) {
|
|
g_categoryEnables[i] = enable;
|
|
return true;
|
|
} else {
|
|
if (isCategorySupportedForRoot(c)) {
|
|
fprintf(stderr, "error: category \"%s\" requires root "
|
|
"privileges.\n", name);
|
|
} else {
|
|
fprintf(stderr, "error: category \"%s\" is not supported "
|
|
"on this device.\n", name);
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
fprintf(stderr, "error: unknown tracing category \"%s\"\n", name);
|
|
return false;
|
|
}
|
|
|
|
static void listSupportedCategories()
|
|
{
|
|
for (int i = 0; i < NELEM(k_categories); i++) {
|
|
const TracingCategory& c = k_categories[i];
|
|
if (isCategorySupported(c)) {
|
|
printf(" %10s - %s\n", c.name, c.longname);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Print the command usage help to stderr.
|
|
static void showHelp(const char *cmd)
|
|
{
|
|
fprintf(stderr, "usage: %s [options] [categories...]\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"
|
|
" -n ignore signals\n"
|
|
" -s N sleep for N seconds before tracing [default 0]\n"
|
|
" -t N trace for N seconds [defualt 5]\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"
|
|
" --list_categories\n"
|
|
" list the available tracing categories\n"
|
|
);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
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 },
|
|
{"list_categories", no_argument, 0, 0 },
|
|
{ 0, 0, 0, 0 }
|
|
};
|
|
|
|
ret = getopt_long(argc, argv, "b:cns:t:z",
|
|
long_options, &option_index);
|
|
|
|
if (ret < 0) {
|
|
for (int i = optind; i < argc; i++) {
|
|
if (!setCategoryEnable(argv[i], true)) {
|
|
fprintf(stderr, "error enabling tracing category \"%s\"\n", argv[i]);
|
|
exit(1);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
switch(ret) {
|
|
case 'b':
|
|
g_traceBufferSizeKB = atoi(optarg);
|
|
break;
|
|
|
|
case 'c':
|
|
g_traceOverwrite = true;
|
|
break;
|
|
|
|
case 'n':
|
|
g_nohup = true;
|
|
break;
|
|
|
|
case 's':
|
|
g_initialSleepSecs = atoi(optarg);
|
|
break;
|
|
|
|
case 't':
|
|
g_traceDurationSeconds = atoi(optarg);
|
|
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;
|
|
} else if (!strcmp(long_options[option_index].name, "list_categories")) {
|
|
listSupportedCategories();
|
|
exit(0);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
fprintf(stderr, "\n");
|
|
showHelp(argv[0]);
|
|
exit(-1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
registerSigHandler();
|
|
|
|
if (g_initialSleepSecs > 0) {
|
|
sleep(g_initialSleepSecs);
|
|
}
|
|
|
|
bool ok = startTrace();
|
|
|
|
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();
|
|
|
|
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;
|
|
}
|