long getFreeTinyMemory() {
    long tinyFree = 0;
    for (int i = 0; i < tinyFreeLists.length(); i++) {
      OffHeapStoredObjectAddressStack cl = tinyFreeLists.get(i);
      if (cl != null) {
        tinyFree += cl.computeTotalSize();
      }
    }
    return tinyFree;
  }
If addr is in the free space of a fragment then return that fragment; otherwise return null.
geode-core/src/main/java/org/apache/geode/internal/offheap/FreeListManager.java