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发表于 2003-4-18 13:22:57
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1. Extended paging is used to translate large contiguous linear address ranges into corresponding physical ones; in these cases, the kernel can do without intermediate Page Tables and thus save memory and preserve TLB entries
2。the position of the Page Middle Directory in the sequence of pointers is kept so that the same code can work on 32-bit and 64-bit architectures
4。the buddy system is a reasonable compromise to overcome the disadvantages of both the fixed and variable partitioning schemes. it has found application in parallel systems as an efficent means of the allocation and realease for parallel programs .a modified form of the buddy system is used for unix kernel memory allocation(cite from os internals and design principles)
5.yes . |
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