Process scheduling

Hello, I want to understand the flow of code of process scheduler of linux kernel. What I have understood is that The task marks itself as sleeping, puts itself on a wait queue, removes itself from the red-black tree of runnable, and calls schedule() to select a new process to execute. for Waking back up The task is set as runnable, removed from the wait queue, and added back to the red-black tree. Can I get the details of which function does what? in sched/core.c and in sched/fair.c I am concerned only with fair scheduler. There are so many functions in these two files that I am totally confused.