Some offhand questions

[Cesar Soares Lucas]

Hello!

I've a few questions that I'd like to ask your opinion about.

- Signed Jars: As far as I understand, we currently don't include classes from signed jars in the CDS archive. What is the reason for that? I had the impression that being able to archive such classes would be important given that many .jars are signed?!

- Profile/Archive score: I've been thinking that maybe a profile/archive score would be something useful to have at some point. The goal with such a "score" would be to report back to the user how much information from the archive was effectively used during a production run so that they have some insight about how "good" was the training run used to create the archive. The score for an archive could be an [weighted] aggregate of the scores of specific parts of the archive. We could also use the scores, in the future, if we choose to work on something to "merge" or "combine" multiple archives.

- Condensers: I've been asked recently about the idea of condensers. As far as I understand there is nothing implemented on the lines of that idea. Is this something that we still plan to work in the future?

- Recompilation: I've been reviewing the changes in the @premain branch, and I came across this piece of code [1] and was puzzled by it. Why do we recompile the code at every compilation level? There is a lot I still don't understand about the implementation in premain, but what I was expecting was that at some point in the code we would just "dump" the code cache and that would be our "AOT compiled code".


Thanks,
Cesar

[1] https://github.com/openjdk/leyden/blob/premain/src/hotspot/share/compiler/precompiler.cpp#L234