code: def get_isolated_cpus():
      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