public int getFreedChunks() {
    int elementCountFromTinyFreeLists =
        getElementCountFromTinyFreeLists();
    int elementCountFromHugeFreeLists =
        getElementCountFromHugeFreeLists();

    return elementCountFromTinyFreeLists + elementCountFromHugeFreeLists;
  }
Defragments memory and returns true if enough memory to allocate chunkSize is freed. Otherwise
returns false; Unlike the defragment method this method is not thread safe and does not check
for a concurrent defragment. It should only be called by defragment and unit tests.
geode-core/src/main/java/org/apache/geode/internal/offheap/FreeListManager.java