Basic LRU (least recently used) maintains an ordered list, new entries are added at the top of the list and cache hits move to the top.
Basic LRU maintains an ordered list (the cache directory) of resource entries in the cache, with the sort order based on the time of most recent access. New entries are added at the top of the list, after the bottom entry has been evicted. Cache hits move to the top, pushing all other entries down. 
