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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.
，更多细节参见同城约会
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'Paradise' Season 2 review: Great things lie beyond the bunker
。关于这个话题，夫子提供了深入分析
// 3. 计算当日跨度：跨度 = 当前索引 - 上一个更大值的索引（栈空则为i+1）。WPS下载最新地址对此有专业解读
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