linux：a protable operating system
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linux：a protable operating system
linus大神的硕士论文(2011.06阅读)
设计思路：简便性、高效性和移植性
具体实现
微内核microkernel：微内核是内核的精简版本，它设计成在很小的内存空间内增加移植性，提供模块化设计，以使用户安装不同的接口，如UNIX、DOS、Windows、Workplace OS、Workp1ace UNIX等。IBM、Microaoft、开放软件基金会(OSF)和UNIX系统实验室(USL)等新操作系统都采用了这一研究成果的优点。
包括基本的能实现操作系统的基本机制：底层地址空间管理、线程管理、进程间通信，传统的任务：设备驱动、协议栈和文件系统都被从内核中清除出来，在用户空间运行。从下图中可以很明显的看出来：将某些在传统内核中实现的功能搬到用户态来实现，这就是microkernel的基本特征。
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