Intelligent-Juice895
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.
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Wikipedia calls it DTD-1 for some reason, but IBM sources consistently
第六十八条 房屋出租人将房屋出租给身份不明、拒绝登记身份信息的人的，或者不按规定登记承租人姓名、有效身份证件种类和号码等信息的，处五百元以上一千元以下罚款；情节较轻的，处警告或者五百元以下罚款。