Transcription of Virtual Memory and Address Translation
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Virtual Memory and Address Translation
Virtual Memory andAddress Translation1 ReviewProgram addresses are Virtual addresses. Relative offset of program regions can not change during program execution. , heap can not move further from Virtual addresses == physical Address inconvenient. Program location is compiled into the single offset register allows the OS to place a process Virtual Address space anywhere in physical Memory . Virtual Address space must be smaller than physical. Program is swapped out of old location and swapped into creates external fragmentation and requires large 2ggqgregions of contiguous physical Memory .
To lookup page i, perform the following: ¾Compute f(i) and use it as an index into the table of page registers 21 ¾Extract the corresponding page register ¾Check if the register tag contains i, if so, we have a hit ¾Otherwise, we have a miss Searching the Inverted Page Table Using Hash Tables (Cont’d.) Minor complication
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