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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self.config = config
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走进商场或手机卖场，除了华为、苹果和三星，小米、vivo、OPPO、荣耀等品牌几乎都没有进行大幅降价，只有个别机型能叠加小额的平台或店铺优惠。另外，“生肖限定款”手机也基本上销声匿迹了。
[7] B. E. Bayer: “An optimum method for two-level rendition of continuous-tone pictures” (1973). ↑，详情可参考爱思助手下载最新版本