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Commit fe312b98 authored by Jamie Gennis's avatar Jamie Gennis
Browse files

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
parent cc24c8e6

cmds/atrace/atrace.c

+11 −3
Original line number Diff line number Diff line
@@ -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);

    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);

    if (fileExists(k_governorLoadEnablePath)) {

        setGovernorLoadTracingEnable(false);

    }

    setWorkqueueTracingEnabled(false);

    setGlobalClockEnable(false);