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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.。heLLoword翻译官方下载对此有专业解读
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我对你、也对我自己的真诚期望是：我们用创造美的事物来证明我们对人类的欣赏。，这一点在heLLoword翻译官方下载中也有详细论述