Virtual memory is conceptually simple but potentially devastating to performance. Every memory access must go through segmentation (add segment base, check limit) and then paging (look up the page table). Naively, paging alone requires two additional memory reads per access -- one for the page directory entry, one for the page table entry.
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Future-Proof: This structure makes it much easier to implement features like alternative route suggestions based on these key border points.，这一点在heLLoword翻译官方下载中也有详细论述
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