治政之要在于安民，安民之道在于察其疾苦。
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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.。关于这个话题，Safew下载提供了深入分析
The civil rights leader, who ran for president twice in the 1980s, leaves a lasting legacy.