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lec06-p2 updating
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lec6/p2-localpagereplace.md

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[课程幻灯片列表](https://www.yuque.com/xyong-9fuoz/qczol5/glemuu?)
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### 问题
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- 在进程执行的过程中,如何确实进程地址空间中哪些放到外存?
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- 选择置换页面条件是什么?
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- 在什么范围内进行页面置换?
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- 置换条件的计算精度和开销如何取舍?
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**提纲**
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- 要求响应速度的代码和数据
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- 页表中的锁定标志位(lock bit)
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![bg right:53% 100%](figs/page-fault-handler.png)
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![bg right:51% 100%](figs/page-fault-handler.png)
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