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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美國和以色列的軍事行動正在摧毀伊朗的軍事能力。即使政權倖存,中東的權力平衡也已被改變。,这一点在91视频中也有详细论述
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