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Linux 内核页表拷贝和存储的问题

Linux 内核页表的内容是被所有进程共享的：那为什么不同进程的内核页表还要单独分配存储空间？要用深拷贝（memcpy master page table 的内容）而不用浅拷贝（所有进程共享同一份内核页表）的方式？这样做是出于什么原因考虑？

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