private void realClose() {
    // Removing this memory immediately can lead to a SEGV. See 47885.
    if (setClosed()) {
      freeList.freeSlabs();
      stats.close();
      if (nonRealTimeStatsUpdater != null) {
        nonRealTimeStatsUpdater.stop();
      }
      singleton = null;
    }
  }
Returns a possibly empty list that contains all the Chunks used by regions.
geode-core/src/main/java/org/apache/geode/internal/offheap/MemoryAllocatorImpl.java