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2026-02-28 00:00:00:0周小霞3014274110http://paper.people.com.cn/rmrb/pc/content/202602/28/content_30142741.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/28/content_30142741.html11921 黔北灰豆腐（多味斋）
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.