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

[Amit Kumar]

On Wed, 27 Nov 2024 15:48:29 GMT, Lutz Schmidt <lucy at openjdk.org> wrote:

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

I do but they don't look interesting. 

withpatch: 

Benchmark                                   Mode  Cnt   Score   Error  Units
SecondarySuperCacheInterContention.test     avgt   15  10.488 ± 0.126  ns/op
SecondarySuperCacheInterContention.test:t1  avgt   15  10.528 ± 0.181  ns/op
SecondarySuperCacheInterContention.test:t2  avgt   15  10.448 ± 0.168  ns/op
Finished running test 'micro:vm.compiler.SecondarySuperCacheInterContention'


without patch: 

Benchmark                                   Mode  Cnt   Score   Error  Units
SecondarySuperCacheInterContention.test     avgt   15  10.450 ± 0.154  ns/op
SecondarySuperCacheInterContention.test:t1  avgt   15  10.451 ± 0.170  ns/op
SecondarySuperCacheInterContention.test:t2  avgt   15  10.450 ± 0.207  ns/op
Finished running test 'micro:vm.compiler.SecondarySuperCacheInterContention'

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PR Comment: https://git.openjdk.org/jdk/pull/22341#issuecomment-2504233607