What is a Scheduler Anyways?

What is a Scheduler Anyways? Table of Contents 1. So What Happened? 2. Lavd 3. Erlang Schedulers 4. The Problem Last year, we had an outage that got detailed in the Linux Plumbers Conference: https://www.youtube.com/watch?v=KFItEHbFEwg, where a deployment of Lavd broke the Erlang runtime that had CPU pinning enabled. As part of this, I wanted to learn more about the interplay between these two systems. sched_ext1 is here to stay, and growing, and I expect it to only get more...