RFR: 8340171: CDS: Enhance bitmap truncation [v2]

[Aleksey Shipilev]

On Fri, 20 Sep 2024 06:05:02 GMT, John R Rose <jrose at openjdk.org> wrote:

> I'm racking my brain to figure out if there is some kind of regression test we could write to detect a future situation like this: (a) Someone changes the AOT cache so that there is a burst of new oops or metadata pointers injected, and then (b) the pointer bitmap loses its clever compression. How will we notice such a thing?

Hey, I filed https://bugs.openjdk.org/browse/JDK-8340516 for this. It would probably take a some time to figure out, since there is an ambiguity in how to achieve this. So I would rather see it addressed separately.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/21010#issuecomment-2362987935