RFR: 8338546: Speed up ConstantPoolBuilder::classEntry(ClassDesc) [v3]

[Chen Liang]

On Tue, 17 Sep 2024 02:04:51 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Speed up `ConstantPoolBuilder::classEntry(ClassDesc)` by going through `ClassDesc` comparison and reusing descriptor hash to calculate internal name hash if possible. No suitable device to run benchmarks so need to find something to run the new benchmark to ensure things work as intended.
>
> Chen Liang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 15 commits:
> 
>  - Fix build
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/classentry-speedup
>  - Buggy 2nd attempt - crashes hotspot
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/classentry-speedup
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/classentry-speedup
>  - More conflicts
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/classentry-speedup
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/classentry-speedup
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/classentry-speedup
>  - Another bug in benchmark
>  - ... and 5 more: https://git.openjdk.org/jdk/compare/996790c7...6117a5bd

Marking this as RFR; benchmarks against baseline 996790c70f902d7840d0649a6b0867bed47c6537 shows this is a net startup improvement, though the effects of this patch becomes more minuscule in larger workloads.

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PR Comment: https://git.openjdk.org/jdk/pull/20667#issuecomment-2354364933