Inuse-number of 4k pages mapped into memory.
inuse——映射到内存中的4 K分页的数目。
pin—number of 4K pages mapped into memory and pinned (pin is a subset of inuse)
pin ——映射到内存中的、且固定的 4K 分页的数目（pin 是 inuse 的子集）
Some, such as the one you are reading now, have remained inuse, but most have fallen into disuse.
其中有一些，例如英语，如今仍在使用，但是大多数已经逐渐不为人知了。
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