RFR: 8337511: Implement JEP 404: Generational Shenandoah (Experimental) [v8]

[William Kemper]

On Thu, 21 Nov 2024 10:15:27 GMT, Aleksey Shipilev <shade 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 524 commits:
>> 
>>  - Merge remote-tracking branch 'shenandoah/master' into great-genshen-pr-redux
>>  - 8344670: GenShen: Use concurrent worker session for concurrent mark phase
>>    
>>    Reviewed-by: kdnilsen
>>  - 8344640: GenShen: Reuse existing card mark barrier function when dropping references
>>    
>>    Reviewed-by: shade, ysr
>>  - 8344592: GenShen: Remove unnecessary comments and changes
>>    
>>    Reviewed-by: kdnilsen
>>  - 8344263: GenShen: Reduce extraneous log messages at INFO level
>>    
>>    Reviewed-by: ysr, shade
>>  - 8344638: GenShen: Verifier should not touch claim token
>>    
>>    Reviewed-by: shade
>>  - Merge
>>  - 8344320: GenShen: Possible null pointer usage in shGenerationalHeap
>>    
>>    Reviewed-by: wkemper, ysr
>>  - 8344321: GenShen: Fix various sonar scan warnings
>>    
>>    Reviewed-by: kdnilsen, shade
>>  - 8344264: GenShen: Improve comments and method names
>>    
>>    Reviewed-by: shade
>>  - ... and 514 more: https://git.openjdk.org/jdk/compare/95a00f8a...7ab16403
>
> src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp line 663:
> 
>> 661: // ---------- CDS archive support
>> 662: 
>> 663:   bool can_load_archived_objects() const override { return !ShenandoahCardBarrier; }
> 
> This means CDS heap loading is not yet working with generational Shenandoah? This looks OK for the experimental code. Please submit a bug for this and assign it to me. I will take a look at it some time later.

Yes, we have: https://bugs.openjdk.org/browse/JDK-8339182

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PR Review Comment: https://git.openjdk.org/jdk/pull/21273#discussion_r1852633232