Фото: Bilal Hussein / AP
• （本文仅为作者个人观点，不代表本报立场）
，详情可参考safew官方版本下载
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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圖像來源，BBC News Chinese