In this chapter, you learned about several areas and facets of the versatile Linux kernel's CPU scheduler. Firstly, you saw how the actual KSE is a thread and not a process, followed by gaining an appreciation of the available scheduling policies that the OS implements. Next, you understood that to support multiple CPUs in a superbly scalable fashion, the kernel powerfully mirrors this with a design that employs one runqueue per CPU core per scheduling class. How to query any given thread's scheduling policy and priority, and deeper details on the internal implementation of the CPU scheduler, were then covered. We focused on how the modern scheduler leverages the modular scheduling classes design, who exactly runs the actual scheduler code and when, and ended with a brief note on the context switch.
The next chapter has you continue on this journey, gaining more insight and details on the workings of the kernel-level CPU scheduler. I suggest you first fully...
