RFR: 8372999: Parallel: Old generation min size constraint broken [v4]

[Stefan Karlsson]

On Wed, 3 Dec 2025 14:10:33 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Adding a missed min-gen-size-checking before shrinking old-gen.
>> 
>> `TEST=serviceability/tmtools/jstat/GcCapacityTest.java JTREG="JAVA_OPTIONS=-XX:+UseParallelGC -XX:InitialRAMPercentage=0"` fails before and passes after the fix.
>> 
>> Test: tier1
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28629#pullrequestreview-3535395503