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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The Cardiff-born star moved to the US to pursue a career in Hollywood, and now lives in New York with his wife, actress Keri Russell.。同城约会对此有专业解读
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