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V2’s version was straightforward:
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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.
第二十五条 从事原子能研究、开发和利用活动的单位,应当尽可能减少放射性废物的产生量,严格按照有关法律、行政法规和标准的要求,对放射性废物实行分类管理和安全处理处置。