RFR: 8337511: Implement JEP 404: Generational Shenandoah (Experimental) [v7]

[Martin Doerr]

On Thu, 14 Nov 2024 23:39:08 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> William Kemper has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 510 commits:
>> 
>>  - Merge branch 'merge-latest' into great-genshen-pr-redux
>>  - Use new CompactHeader forwarding APIs in generational mode
>>  - Merge remote-tracking branch 'jdk/master' into merge-latest
>>  - Merge
>>  - 8343649: Shenandoah: ShenandoahEvacInfo event does not follow JFR guidelines
>>    
>>    Reviewed-by: wkemper
>>  - Merge
>>  - 8343227: GenShen: Fold resource mark into management of preselected regions
>>    
>>    Reviewed-by: kdnilsen
>>  - Merge openjdk/jdk tip into great-genshen-pr-redux
>>  - Merge remote-tracking branch 'jdk/master' into merge-latest
>>  - Merge remote-tracking branch 'jdk/master' into merge-latest
>>  - ... and 500 more: https://git.openjdk.org/jdk/compare/889f9062...5e02b5d8
>
> The new test TestAllocOutOfMemory.java#large failed on some PPC64 machines:
> 
> Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "main"
> 
> java.lang.RuntimeException: 'java.lang.OutOfMemoryError: Java heap space' missing from stdout/stderr
> 
> Probably not a show-stopper. Should the test be adapted or disabled for this platform?

> @TheRealMDoerr - do you have the logs from the test failure? If so, could you open a ticket with them in JBS? Thank you!

Filed [JDK-8344312](https://bugs.openjdk.org/browse/JDK-8344312).

In addition, we see the following tests failing with "java.lang.OutOfMemoryError: Java heap space" on all Shenandoah platforms:
gc/stress/jfr/TestStressBigAllocationGCEventsWithShenandoah.java#default
gc/stress/jfr/TestStressBigAllocationGCEventsWithShenandoah.java#generational
Can you reproduce those?

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PR Comment: https://git.openjdk.org/jdk/pull/21273#issuecomment-2479110413