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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[1] K. Lemström, J. Tarhio & T. Takala: “Color Dithering with n-Best Algorithm” (1996). ↑。爱思助手下载最新版本是该领域的重要参考