cache buffers LRU chain 竞争问题 ; 闩锁竞争与解决
When the memory cache region becomes full, LRU removes the least recently used cached data first.
当内存缓存区域满时，lru会首先删除最近最少使用的缓存数据。
The buffer cache is managed as a set of least recently used (LRU) lists.
以最近使用(LRU)列表的形式管理缓冲区缓存。
It is not suited for high throughput caching and does not provide any LRU based cache invalidation or distributed locking semantics.
它不适合进行高吞吐量的缓存，也不支持基于LRU (Latest Recently Used)的缓存校验与分布式的锁语义。
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