bool Start()
{
stopTrace(); // stop old
startTrace();
if (!m_kernelSession.Init(true, KERNEL_LOGGER_NAMEW) ||
!m_heapSession.Init(true, HEAP_LOGGER_NAMEW))
{
stopTrace();
return false;
}
m_kernelSession.Start();
m_heapSession.Start();
m_flusher.Start();
_ThreadBase::Start();
return true;
}
void Stop()
{
_ThreadBase::SetNeedExit();
m_flusher.SetNeedExit();
stopTrace();
m_kernelSession.Stop();
m_heapSession.Stop();
_ThreadBase::Stop();
m_flusher.Stop();
}
void Tracer::startTrace(string filename)
{
if (m_enabled) {
stopTrace();
}
if (filename != "") {
m_trace_file.open(filename.c_str());
if (m_trace_file.fail()) {
cout << "Error: error opening file '" << filename << "'" << endl;
cout << "Trace not enabled." << endl;
return;
}
cout << "Request trace enabled to output file '" << filename << "'" << endl;
m_enabled = true;
}
}
int main(int argc, char **argv)
{
bool isRoot = (getuid() == 0);
if (argc == 2 && 0 == strcmp(argv[1], "--help")) {
showHelp(argv[0]);
exit(0);
}
for (;;) {
int ret;
ret = getopt(argc, argv, "b:gcidflst:wz");
if (ret < 0) {
break;
}
switch(ret) {
case 'g':
if (!isRoot) {
fprintf(stderr, "error: tracing GPU power state requires root privileges\n");
exit(1);
}
g_traceGpuPower = true;
break;
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_traceCpuFrequency = true;
break;
case 's':
g_traceSchedSwitch = true;
break;
case 't':
g_traceDurationSeconds = atoi(optarg);
break;
case 'w':
if (!isRoot) {
fprintf(stderr, "error: tracing kernel work queues requires root privileges\n");
exit(1);
}
g_traceWorkqueue = true;
break;
case 'z':
g_compress = true;
break;
default:
fprintf(stderr, "\n");
showHelp(argv[0]);
exit(-1);
break;
}
}
registerSigHandler();
bool ok = startTrace(isRoot);
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(isRoot);
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");
}
// Reset the trace buffer size to 1.
setTraceBufferSizeKB(1);
return g_traceAborted ? 1 : 0;
}
str
CMDstopTrace(void *res)
{
(void) res;
return stopTrace(0);
}
str
CMDstopTracePath(void *res, str *path)
{
(void) res;
return stopTrace(*path);
}
