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Update README.md
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@junknet
junknet authored Mar 27, 2022
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# note 22.2.16
pte_none pte表 可能不存在，缺页异常 非真实物理RAM映射 三级表
从 __arch_copy_from_user 源码中分析 带mmu的处理器 读取到没映射的页面，开始进入缺页异常，
do_page_fault 处理映射页 交换掉主存pte垃圾表
do_page_fault 处理映射页 交换掉主存pte表

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