Following JDK-8356027, we can build a simple tool that shows the compilation timelines for a given workload. This is useful to study compiler dynamics in projects like Leyden. We can put it into src/tools, along with IGV and other tools.

Proof-of-concept:
 https://github.com/openjdk/jdk/pull/25089

...yields the result like in poc-visualizer.png attached.