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上下文切换 #46

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superDCF opened this issue Dec 25, 2020 · 0 comments

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Linux Performance

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superDCF commented Dec 25, 2020

发生CPU上下文切换的情况有：
1、进程上下文切换
用户态和内核态的执行栈、寄存器等信息都要保存

2、线程上下文切换
一般只需要保存该线程的私有的执行栈和一些寄存器信息保存

3、中断
不需要用户态的保存，只要内核态的执行信息保存。

发生CPU上下文切换，有当前执行信息的保存和要执行的进程的执行信息恢复

superDCF added the Linux Performance label

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