RFR: 8318706: Implementation of JDK-8276094: JEP 423: Region Pinning for G1 [v9]

[Thomas Schatzl]

On Fri, 3 Nov 2023 12:41:05 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   ayang review - renamings + documentation
>
> src/hotspot/share/gc/g1/g1_globals.hpp line 327:
> 
>> 325:           range(1, 256)                                                     \
>> 326:                                                                             \
>> 327:   product(uint, G1NumCollectionsKeepPinned, 8, DIAGNOSTIC,                  \
> 
> Any particular reason this is not `EXPERIMENTAL`?

Changing this does not in any way enable risky/experimental code not fit for production. This knob is for helping diagnose performance issues.

G1 does have its fair share of experimental options, but all/most of these were from the initial import where G1 as a whole had been experimental (unstable) for some time.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16342#discussion_r1381706769