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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县城有种在失序中令人心安的感觉。大城市日新月异，农村人越来越少，仿佛只有县城，还保留着旧日的底色和新时代的光辉。