习近平总书记的回答温暖人心：“我忙就是忙这些事，‘国之大者’就是人民的幸福生活。”
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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safew官方下载
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