解释一个词语：preemption

雨轩学院

于 2009-02-14 20:20:00 发布

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分类专栏： linux 内核分析文章标签： events system

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本文探讨了Merriam-Webster中preemption的概念，并深入解析了Linux内核配置项CONFIG_PREEMPT与CONFIG_PREEMPT_BKL的作用，旨在减少内核延迟，提升桌面系统及实时系统的响应速度。

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Merriam-Webster的解为：

preemption

1 the right of purchasing befor others; especially: one given by the government to the actual settler upon a tract of public land

2 the purchase of something under this right

3 a prior seizure or appropriation: a taking posssession before others

CONFIG_PREEMPT - This option reduces the latency of the kernel when reacting to 
real-time or interactive events by allowing a low priority process to
be preempted even if it is in kernel mode executing a system call.

Say Y here if you are building a kernel for a desktop, embedded
or real-time system. Say N if you are unsure.

CONFIG_PREEMPT_BKL - This option reduces the latency of the kernel by making the 
big kernel lock （BKL）preemptible.

Say Y here if you are building a kernel for a desktop system.
Say N if you are unsure.