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atrace: add sync trace support

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Change-Id: I2cd2f1a1e51f6e3d1ebbde4d5442be68a218b33d
This commit is contained in:
Erik Gilling 2012-10-17 12:16:01 -07:00
parent 31be80f02c
commit 9ba4baf178
1 changed files with 26 additions and 1 deletions
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27
cmds/atrace/atrace.c
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@ -35,6 +35,7 @@ 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;
@ -76,6 +77,9 @@ static const char* k_cpuIdleEnablePath =
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";
@ -196,6 +200,16 @@ static bool setGovernorLoadTracingEnable(bool 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)
{
@ -267,6 +281,7 @@ static bool startTrace(bool isRoot)
// root.
if (isRoot) {
ok &= setBusUtilizationTracingEnable(g_traceBusUtilization);
ok &= setSyncTracingEnabled(g_traceSync);
ok &= setWorkqueueTracingEnabled(g_traceWorkqueue);
ok &= setDiskTracingEnabled(g_traceDisk);
}
@ -296,6 +311,7 @@ static void stopTrace(bool isRoot)
if (isRoot) {
setBusUtilizationTracingEnable(false);
setSyncTracingEnabled(false);
setWorkqueueTracingEnabled(false);
setDiskTracingEnabled(false);
}
@ -415,6 +431,7 @@ static void showHelp(const char *cmd)
" -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");
}
@ -447,7 +464,7 @@ int main(int argc, char **argv)
for (;;) {
int ret;
ret = getopt(argc, argv, "b:cidflst:uwznS:");
ret = getopt(argc, argv, "b:cidflst:uwyznS:");
if (ret < 0) {
break;
@ -514,6 +531,14 @@ int main(int argc, char **argv)
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;