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，快连下载-Letsvpn下载提供了深入分析
// 创建临时数组存储左子数组（右子数组可直接用原数组），详情可参考一键获取谷歌浏览器下载
Author(s): Mona Vishwakarma, Debdip Bhandary