presto-main/src/main/java/io/prestosql/operator/Driver.java/Driver/createTimer
class Driver:    private OperationTimer createTimer()
    {
        return new OperationTimer(
                driverContext.isCpuTimerEnabled(),
                driverContext.isCpuTimerEnabled() && driverContext.isPerOperatorCpuTimerEnabled());
    }