RFR: JDK-8180450: secondary_super_cache does not scale well [v4]

[Andrew Haley]

On Mon, 18 Mar 2024 05:17:55 GMT, David Holmes <dholmes at openjdk.org> wrote:

> I'm unclear why you are presenting this as a Diagnostic feature? I would expect either Experimental if you consider it early days and want more feedback; or else a full Product option that people can opt-in to using, and which eventually becomes the default.

The code for x86 and AArch64 is product ready, but other platforms aren't yet done. I think it should be enabled by default, but YMMV.

The new -XX options will surely be needed by the maintainers of other platforms during porting. They may also be useful during the review phase of this patch, for reviewers to test before/after performance on their own systems.

`UseSecondarySuperCache` and `HashSecondarySupers` perhaps make sense as (rather esoteric) product flags, but`VerifySecondarySupers` and `StressSecondarySuperHash` are strictly for port maintainers.

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PR Comment: https://git.openjdk.org/jdk/pull/18309#issuecomment-2003538088