protected synchronized void unlinkEntry(EvictionNode evictionNode) {
    EvictionNode next = evictionNode.next();
    EvictionNode previous = evictionNode.previous();
    next.setPrevious(previous);
    previous.setNext(next);
    evictionNode.setNext(null);
    evictionNode.setPrevious(null);
    decrementSize();
  }
Adds an lru node to the tail of the list.
geode-core/src/main/java/org/apache/geode/internal/cache/eviction/AbstractEvictionList.java