Mostly about the general approach on how to profile this kind of things. Still a couple of interesting pytest specific tips in here.

Nice way to demystify syscalls in the Linux kernel. It's not that hard to add new ones.

Obviously I strongly agree with this. Participating in code reviews of free software components is a great way to improve. This applies to being a reviewer, submitting code and skimming other reviews.

Nice comics explaining in a simple way how this works.