RFR: 8339983: [s390x] secondary_super_cache does not scale well: C1 and interpreter [v4]

[Lutz Schmidt]

On Wed, 27 Nov 2024 11:23:14 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

>> s390x Port for : [JDK-8331341](https://bugs.openjdk.org/browse/JDK-8331341)
>> 
>> Tier1 test: 
>> 1. `-XX:+UseSecondarySupersTable  -XX:+VerifySecondarySupers -XX:+VerifySecondarySupers -XX:-UseSecondarySupersCache`
>> 2.  No flag turn on. i.e. used `UseSecondarySupersCache` by default. 
>> 3. `-XX:+UseSecondarySupersTable  -XX:+VerifySecondarySupers -XX:+VerifySecondarySupers -XX:-UseSecondarySupersCache` with C1 compiler
>
> Amit Kumar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   updates comments

Are there any performance figures? Does the change help, or at least do no harm, on s390?

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PR Review: https://git.openjdk.org/jdk/pull/22341#pullrequestreview-2465410184