private void collectFreeHugeChunks(List<LongStack> l) {
    OffHeapStoredObject c = hugeChunkSet.pollFirst();
    OffHeapStoredObjectAddressStack result = null;
    while (c != null) {
      if (result == null) {
        result = new OffHeapStoredObjectAddressStack();
        l.add(result);
      }
      result.offer(c.getAddress());
      c = hugeChunkSet.pollFirst();
    }
  }
Unit tests override this method to get better test coverage
geode-core/src/main/java/org/apache/geode/internal/offheap/FreeListManager.java