Method freeze

src/linux/cgroups.cpp:1453–1460

  }

  Future<Nothing> freeze()
  {
    // TODO(jieyu): This is a workaround for MESOS-1689. We will move
    // away from freezer once we have pid namespace support.
    return cgroups::freezer::freeze(hierarchy, cgroup).after(
        FREEZE_RETRY_INTERVAL,
        lambda::bind(&freezeTimedout, lambda::_1, self()));
  }

  Future<Nothing> kill()
  {