2)Specifies the approximate percentage of the InnoDB buffer pool used for the old block sublist
2)Specifies how long in milliseconds a block inserted into the old sublist must stay there after its first access before it can be moved to the new sublist.
If the value is 0, a block inserted into the old sublist moves immediately to the new sublist the first time it is accessed, no matter how soon after insertion the access occurs.
If the value is greater than 0, blocks remain in the old sublist until an access occurs at least that many milliseconds after the first access.
For example, a value of 1000 causes blocks to stay in the old sublist for 1 second after the first access before they become eligible to move to the new sublist.
innodb_old_blocks_time用来控制old sublist中page的转移策略，新的page页在进入LRU链表中时，会先插入到old sublist的头部，然后page需要在old sublist中停留
该参数的设置可以保护new sublist，尽可能的防止其being filled by page that is referenced only for a brief period。
原文出处：csdn -> https://blog.csdn.net/u014710633/article/details/94594598