分页置换(page replacement) 的动作，所以 process 会去置换掉其他 process 的 page 结果造成其他 process 也发生了 page fault 无法继续运作。
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如果某个行的大小大于页大小(即大于2 KB)，那么包含该行的页面可能被置换出内存。
If a row is larger than a page (that is larger than 2 KB), then the page containing that row might be kicked out of memory.
在对有大量内存的系统进行扫描时，因为页面置换算法始终寻找空闲帧，所以需要扫描的页帧数量非常大。
Because the page replacement algorithm is always looking for free frames while it is doing its scanning on systems with a lot of memory, the number of frames to scan can be significant.
VMM 提供了一种页面置换算法，该算法用于分配页帧，以及确定应该将当前 RAM 中的哪些虚拟内存页面的页帧置换回空闲列表。
The VMM has a page-replacement algorithm, which assigns the page frames and determines exactly which virtual-memory pages currently in RAM will have their page frames brought back to the free list.
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