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，这一点在下载安装 谷歌浏览器 开启极速安全的 上网之旅。中也有详细论述
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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.