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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。关于这个话题，Line官方版本下载提供了深入分析
它可能会诞生赢家，但赢家不会是所有人。
These are packed into a 16-bit state vector:。关于这个话题，搜狗输入法下载提供了深入分析