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atrace: make cpu freq governor tracing optional 

This change allows atrace to run on kernels that do not have CPU frequency
interactive governor tracing enabled in the kernel.

Change-Id: Ibfde751da7b6cc9a55794355093a37feb28f5e52
This commit is contained in:
Jamie Gennis 2012-04-09 17:33:45 -07:00
parent cc24c8e6b4
commit fe312b98f7
1 changed files with 11 additions and 3 deletions
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14
cmds/atrace/atrace.c
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@ -55,7 +55,6 @@ static const char* k_cpuFreqEnablePath =
static const char* k_governorLoadEnablePath =
"/sys/kernel/debug/tracing/events/cpufreq_interactive/enable";
static const char* k_workqueueEnablePath =
"/sys/kernel/debug/tracing/events/workqueue/enable";
@ -169,6 +168,11 @@ static bool setGlobalClockEnable(bool enable)
return writeStr(k_traceClockPath, enable ? "global" : "local");
}
// Check whether a file exists.
static bool fileExists(const char* filename) {
return access(filename, F_OK) != -1;
}
// Enable tracing in the kernel.
static bool startTrace()
{
@ -178,7 +182,9 @@ static bool startTrace()
ok &= setTraceOverwriteEnable(g_traceOverwrite);
ok &= setSchedSwitchTracingEnable(g_traceSchedSwitch);
ok &= setCpuFrequencyTracingEnable(g_traceCpuFrequency);
ok &= setGovernorLoadTracingEnable(g_traceGovernorLoad);
if (fileExists(k_governorLoadEnablePath) || g_traceGovernorLoad) {
ok &= setGovernorLoadTracingEnable(g_traceGovernorLoad);
}
ok &= setWorkqueueTracingEnabled(g_traceWorkqueue);
ok &= setTraceBufferSizeKB(g_traceBufferSizeKB);
ok &= setGlobalClockEnable(true);
@ -203,7 +209,9 @@ static void stopTrace()
setTraceOverwriteEnable(true);
setSchedSwitchTracingEnable(false);
setCpuFrequencyTracingEnable(false);
setGovernorLoadTracingEnable(false);
if (fileExists(k_governorLoadEnablePath)) {
setGovernorLoadTracingEnable(false);
}
setWorkqueueTracingEnabled(false);
setGlobalClockEnable(false);