How to use the pyperf._utils.sysfs_path function in pyperf

def collect_cpu_temperatures(metadata):
    path = sysfs_path("class/hwmon")
    try:
        names = os.listdir(path)
    except OSError:
        return None

    cpu_temp = []
    for name in names:
        hwmon = os.path.join(path, name)
        get_cpu_temperature(hwmon, cpu_temp)
    if not cpu_temp:
        return None

    metadata['cpu_temp'] = ', '.join(cpu_temp)

def get_isolated_cpus():
    """Get the list of isolated CPUs.

    Return a sorted list of CPU identifiers, or return None if no CPU is
    isolated.
    """
    # The cpu/isolated sysfs was added in Linux 4.2
    # (commit 59f30abe94bff50636c8cad45207a01fdcb2ee49)
    path = sysfs_path('devices/system/cpu/isolated')
    isolated = read_first_line(path)
    if isolated:
        return parse_cpu_list(isolated)

    cmdline = read_first_line(proc_path('cmdline'))
    if cmdline:
        match = re.search(r'\bisolcpus=([^ ]+)', cmdline)
        if match:
            isolated = match.group(1)
            return parse_cpu_list(isolated)

    return None

def use_intel_pstate():
    cpu = 0
    path = sysfs_path("devices/system/cpu/cpu%s/cpufreq/scaling_driver" % cpu)
    scaling_driver = read_first_line(path)
    return (scaling_driver == 'intel_pstate')

def collect_cpu_config(metadata, cpus):
    nohz_full = read_first_line(sysfs_path('devices/system/cpu/nohz_full'))
    if nohz_full:
        nohz_full = parse_cpu_list(nohz_full)

    isolated = get_isolated_cpus()
    if isolated:
        isolated = set(isolated)

    configs = {}
    for cpu in cpus:
        config = get_cpu_config(cpu)
        if nohz_full and cpu in nohz_full:
            config.append('nohz_full')
        if isolated and cpu in isolated:
            config.append('isolated')
        if config:
            configs[cpu] = ', '.join(config)

def get_cpu_config(cpu):
    sys_cpu_path = sysfs_path("devices/system/cpu")
    info = []

    path = os.path.join(sys_cpu_path, "cpu%s/cpufreq/scaling_driver" % cpu)
    scaling_driver = read_first_line(path)
    if scaling_driver:
        info.append('driver:%s' % scaling_driver)

    if scaling_driver == 'intel_pstate':
        path = os.path.join(sys_cpu_path, "intel_pstate/no_turbo")
        no_turbo = read_first_line(path)
        if no_turbo == '1':
            info.append('intel_pstate:no turbo')
        elif no_turbo == '0':
            info.append('intel_pstate:turbo')

    path = os.path.join(sys_cpu_path, "cpu%s/cpufreq/scaling_governor" % cpu)