Context-switch time is overhead; the system does no useful work while switching.
上下文切换的时间开销较重；在切换时，系统没有做有用的工作。
This paper studies the interrupt latency and context-switch time of embedded real-time operating system, and about the interrupt latency a non-maskable interrupt idea is put forward.
本文分析了嵌入式实时操作系统的两个重要的性能指标任务切换时间和中断延时及对实时控制的影响，并针对中断延时提出非屏蔽中断的改进方法。
This gives them context, and it shortens the time necessary to switch from one task to another.
这赋予他们一定的背景，并缩短了从一项任务转向另一项任务所需要的时间。
With modern Linux, though, a context switch between distinct processes might take only 15% more time than the corresponding context switch between same-process threads.
然而，在现代的Linux中，不同进程之间的上下文切换所花的时间只比同一进程的线程之间相应的上下文切换多15%。
The hardware context switch mechanism was adopted by MPC8250. It makes interrupt responding time of MPC8250 has less relativity with operation system.
MPC8250采取了基于硬件的中断现场保护机制，系统中断响应时间与所采用操作系统相关性较小。
In most practical application, context switch doesn't happen at some time tick, so sometime the execution of timer ISR is useless and wastes CPU time.
在实际应用中，并不是每个时钟节拍都有任务调度，所以有很多时钟中断服务程序的工作是多余的，浪费了CPU资源。
In most practical application, context switch doesn't happen at some time tick, so sometime the execution of timer ISR is useless and wastes CPU time.
在实际应用中，并不是每个时钟节拍都有任务调度，所以有很多时钟中断服务程序的工作是多余的，浪费了CPU资源。
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