RFR: 8326957: Implement JEP 474: ZGC: Generational Mode by Default [v4]

[Tom Rodriguez]

On Fri, 3 May 2024 05:44:04 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

>> This is the implementation task for `JEP 474: ZGC: Generational Mode by Default`. See the JEP for details. [JDK-8326667](https://bugs.openjdk.org/browse/JDK-8326667)
>
> Axel Boldt-Christmas has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains eight commits:
> 
>  - Merge tag 'jdk-23+21' into JDK-8326957
>    
>    Added tag jdk-23+21 for changeset e833bfc8
>  - Merge tag 'jdk-23+19' into JDK-8326957
>    
>    Added tag jdk-23+19 for changeset 706b421c
>  - Remove extra space
>  - Use consistent terminology
>  - Merge tag 'jdk-23+17' into JDK-8326957
>    
>    Added tag jdk-23+17 for changeset 8efd7aa6
>  - Merge tag 'jdk-23+16' into JDK-8326957
>    
>    Added tag jdk-23+16 for changeset d580bcf9
>  - Update VMDeprecatedOptions.java test
>  - 8326957: Implementation of Deprecate Non-Generational ZGC

Graal still doesn't support generational ZGC though I'm actively working on it.  I'm hoping to have it in before rampdown but at least until that time JVMCI needs to default to non-generational ZGC.

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PR Comment: https://git.openjdk.org/jdk/pull/18393#issuecomment-2093461126