def _get_cgroup_names():
        """
        :return: a mapping between the subsystem name to the cgroup name
        :rtype: dict[str, str]
        """
        with open("/proc/self/cgroup") as f:
            lines = f.readlines()
            d = {}
            for line in lines:
                line_split = line.rstrip().split(":")
                subsystem = line_split[1]
                group_name = line_split[2]
                d[subsystem] = group_name
            return d
:return: a mapping between the subsystem name to the cgroup name
        :rtype: dict[str, str]