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Commit 99be77cf authored by Erik Gilling's avatar Erik Gilling
Browse files

atrace: add clock rate and bus utilization 

Change-Id: I4e1764b51225436fc2b3d61454ee822f511a1a7d
parent 4b23eefd

cmds/atrace/atrace.c

+39 −8
Original line number Diff line number Diff line
@@ -30,7 +30,8 @@ 
/* Command line options */

static int g_traceDurationSeconds = 5;

static bool g_traceSchedSwitch = false;

static bool g_traceCpuFrequency = false;

static bool g_traceFrequency = false;

static bool g_traceBusUtilization = false;

static bool g_traceCpuIdle = false;

static bool g_traceDisk = false;

static bool g_traceGovernorLoad = false;
@@ -58,9 +59,15 @@ static const char* k_schedSwitchEnablePath = 
static const char* k_schedWakeupEnablePath =

    "/sys/kernel/debug/tracing/events/sched/sched_wakeup/enable";



static const char* k_memoryBusEnablePath =

    "/sys/kernel/debug/tracing/events/memory_bus/enable";



static const char* k_cpuFreqEnablePath =

    "/sys/kernel/debug/tracing/events/power/cpu_frequency/enable";



static const char *k_clockSetRateEnablePath =

    "/sys/kernel/debug/tracing/events/power/clock_set_rate/enable";



static const char* k_cpuIdleEnablePath =

    "/sys/kernel/debug/tracing/events/power/cpu_idle/enable";
@@ -141,10 +148,23 @@ static bool setSchedSwitchTracingEnable(bool enable) 
    return ok;

}



// Enable or disable tracing of the Bus utilization.

static bool setBusUtilizationTracingEnable(bool enable)

{

    bool ok = false;

    // these can be platform specific so make sure that at least

    // one succeeds.

    ok |= setKernelOptionEnable(k_memoryBusEnablePath, enable);

    return ok;

}



// Enable or disable tracing of the CPU clock frequency.

static bool setCpuFrequencyTracingEnable(bool enable)

static bool setFrequencyTracingEnable(bool enable)

{

    return setKernelOptionEnable(k_cpuFreqEnablePath, enable);

    bool ok = true;

    ok &= setKernelOptionEnable(k_cpuFreqEnablePath, enable);

    ok &= setKernelOptionEnable(k_clockSetRateEnablePath, enable);

    return ok;

}



// Enable or disable tracing of CPU idle events.
@@ -225,7 +245,8 @@ static bool startTrace(bool isRoot) 
    // Set up the tracing options that don't require root.

    ok &= setTraceOverwriteEnable(g_traceOverwrite);

    ok &= setSchedSwitchTracingEnable(g_traceSchedSwitch);

    ok &= setCpuFrequencyTracingEnable(g_traceCpuFrequency);

    ok &= setBusUtilizationTracingEnable(g_traceBusUtilization);

    ok &= setFrequencyTracingEnable(g_traceFrequency);

    ok &= setCpuIdleTracingEnable(g_traceCpuIdle);

    if (fileExists(k_governorLoadEnablePath) || g_traceGovernorLoad) {

        ok &= setGovernorLoadTracingEnable(g_traceGovernorLoad);
@@ -260,7 +281,8 @@ static void stopTrace(bool isRoot) 
    // Set the options back to their defaults.

    setTraceOverwriteEnable(true);

    setSchedSwitchTracingEnable(false);

    setCpuFrequencyTracingEnable(false);

    setBusUtilizationTracingEnable(false);

    setFrequencyTracingEnable(false);

    if (fileExists(k_governorLoadEnablePath)) {

        setGovernorLoadTracingEnable(false);

    }
@@ -380,10 +402,11 @@ static void showHelp(const char *cmd) 
                    "  -b N            use a trace buffer size of N KB\n"

                    "  -c              trace into a circular buffer\n"

                    "  -d              trace disk I/O\n"

                    "  -f              trace CPU frequency changes\n"

                    "  -f              trace clock frequency changes\n"

                    "  -l              trace CPU frequency governor load\n"

                    "  -s              trace the kernel scheduler switches\n"

                    "  -t N            trace for N seconds [defualt 5]\n"

                    "  -u              trace bus utilization\n"

                    "  -w              trace the kernel workqueue\n"

                    "  -z              compress the trace dump\n");

}
@@ -415,7 +438,7 @@ int main(int argc, char **argv) 
    for (;;) {

        int ret;



        ret = getopt(argc, argv, "b:cidflst:wz");

        ret = getopt(argc, argv, "b:cidflst:uwz");



        if (ret < 0) {

            break;
@@ -447,7 +470,7 @@ int main(int argc, char **argv) 
            break;



            case 'f':

                g_traceCpuFrequency = true;

                g_traceFrequency = true;

            break;



            case 's':
@@ -458,6 +481,14 @@ int main(int argc, char **argv) 
                g_traceDurationSeconds = atoi(optarg);

            break;



            case 'u':

                if (!isRoot) {

                    fprintf(stderr, "error: tracing bus utilization requires root privileges\n");

                    exit(1);

                }

                g_traceBusUtilization = true;

            break;



            case 'w':

                if (!isRoot) {

                    fprintf(stderr, "error: tracing kernel work queues requires root privileges\n");