protected synchronized boolean removeEntry(EvictionNode evictionNode) {
    if (evictionNode.next() == null) {
      // not in the list anymore.
      return false;
    }

    unlinkEntry(evictionNode);
    return true;
  }
Adds an lru node to the tail of the list.
geode-core/src/main/java/org/apache/geode/internal/cache/eviction/AbstractEvictionList.java