Whether you are a veteran kernel developer or someone that is just curious to what their kernel does, ftrace is the tool to use to see what your kernel is doing. Ftrace, is the official tracer tool of the Linux kernel, that does much more than mere tracing. You can graph into the functions that are called within any function in the kernel, live while it is running. You can see what functions call a specific function for a given load. This talk will give you a taste of the depth of what ftrace has available for you.