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.
"A lot of people use the online world as a place where they can talk about things that they might not feel safe talking about with people in the real world, where being queer might result in being prosecuted," he told the BBC.。业内人士推荐夫子作为进阶阅读
，这一点在safew官方版本下载中也有详细论述
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