Two-level Page Table ·31 ·2221 ·12·11 …0 Virtual Address .value =x value =y value =Z 210 210 page entries entries directory page 212 table 32 bits data entries page frame Size of page directory 32 bits -210 32 bits =4 Kbytes 8 bits Size of page table =210 32 bits=4 Kbytes 多级页表： Size of page 1)按需调入内存一后续讨论忽略！ =212 *8 bits =4 Kbytes 2)可分别置于非连续的内存存储区 13/111•13/111 Two-level Page Table page frame page frame page table page table Virtual Address •31 •22•21 •12•11 •0 page directory page table page frame data •value = y •value = z •y 2 10 entries 32 bits 32 bits Size of page directory = 210 * 32 bits = 4 Kbytes •value = x •x •z 2 10 entries Size of page table = 210 * 32 bits = 4 Kbytes 2 12 entries 8 bits Size of page = 212 * 8 bits = 4 Kbytes 多级页表： 1）按需调入内存——后续讨论忽略！ 2）可分别置于非连续的内存存储区