RFR: 8338526: Don't store abstract and interface Klasses in class metaspace

[Coleen Phillimore]

On Tue, 27 Aug 2024 15:38:24 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>>> I don't think the costs for two address comparisons matter, not with the comparatively few deallocations that happen (few hundreds or few thousand). If deallocate is hot, we are using metaspace wrong.
>> 
>> MethodData does a lot of deallocations from metaspace because it's allocated racily.  It might be using Metaspace wrong.
>
>> > I don't think the costs for two address comparisons matter, not with the comparatively few deallocations that happen (few hundreds or few thousand). If deallocate is hot, we are using metaspace wrong.
>> 
>> MethodData does a lot of deallocations from metaspace because it's allocated racily. It might be using Metaspace wrong.
> 
> I think that should be okay. This should still be an exception. I have never seen that many deallocations happening in customer cases.

@tstuefe Do you have more comments on this PR?

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PR Comment: https://git.openjdk.org/jdk/pull/19157#issuecomment-2326439851