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置换算法
1.在请求分页存管理的页表中增加了若干项信息，其中修改位和坊间位供（）参考。
| 编号 |
选项 |
| A |
程序访问 |
| B |
分配页面 |
| C |
置换算法 |
| D |
调入页面 |
2.LRU page replacement algorithm chooses which of pages to be replaced:
| 编号 |
选项 |
| A |
the oldest page in memory |
| B |
the youngest page in memory |
| C |
the page will not be used for the longest period of time |
| D |
the page that has not been used for the longest period of time |
3.Linux内存管理子系统采用基于内存区域__算法来管理物理页帧的分配和回收。
| 编号 |
选项 |
| A |
伙伴（Buddy） |
| B |
slab分配器 |
| C |
LRU |
| D |
位示图 |
4.A demanded paging system adopts the LRU page replacement algorithm.Consider a reference string 1 8 1 7 8 2 7 2 1 8 3 8 2 1 3 1 7 1 3 7.Given four initially empty page frames, the total number of page faults is__.
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