红帽全球峰会第 42 章 查看抢占状态
使用 CPU 的进程可以放弃它们正在使用的 CPU，可以是 voluntarily 或非自愿。
42.1. 抢占
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进程可以自愿生成 CPU，因为它们已完成，或者因为正在等待事件，如磁盘中的数据、按键或网络数据包。
进程也可以非自愿地生成 CPU。这称为抢占功能，在优先级较高的进程希望使用 CPU 时发生。
抢占可以对系统性能造成负面影响，持续抢占可导致一个称为"垃圾箱(thrashing)的状态。当进程持续被抢占时，不会运行任何进程完成，就会发生这个问题。
更改任务的优先级有助于减少非自愿抢占功能。
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