https://www.kernel.org/doc/Documentation/trace/ftrace.txt

http://www.brendangregg.com/blog/2015-07-08/choosing-a-linux-tracer.html

http://www.slideshare.net/brendangregg/linux-performance-analysis-new-tools-and-old-secrets

https://en.wikipedia.org/wiki/Ftrace

https://lwn.net/Articles/365835/

http://elinux.org/Ftrace

http://lxr.free-electrons.com/source/Documentation/trace/ftrace.txt

https://events.linuxfoundation.org/slides/2010/linuxcon_japan/linuxcon_jp2010_rostedt.pdf

https://www.kernel.org/doc/Documentation/trace/ftrace-design.txt