# 2.6.3 组调度

前面讨论CFS时我们忽略了组调度的逻辑，本章我们将详细讨论一下这个话题。

> 实时进程（RT）与CFS都支持组调度，本节只讨论CFS中组调度的实现。编译内核时如果设置了 `CONFIG_FAIR_GROUP_SCHED=y`, 则CFS将使能组调度的功能。

组调度是随着CFS加入到内核中的，在此之前没有任何一个调度器支持该功能。组调度让CFS能够更灵活地给任务分配时间，也是[cgroups](https://en.wikipedia.org/wiki/Cgroups)的基础，而cgroups又是当前大火的容器技术的基础，因此从根本上理解组调度的运行机制是很有必要的。


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