RFR: 8314599: [GenShen] Couple adaptive tenuring and generation size budgeting [v3]

[Kelvin Nilsen]

On Mon, 6 Oct 2025 22:39:34 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix windows build more
>
> src/hotspot/share/gc/shenandoah/shenandoahGeneration.cpp line 294:
> 
>> 292:   // We have to be careful in the event that SOEP is set to 100 by the user.
>> 293:   assert(ShenandoahOldEvacRatioPercent <= 100, "Error");
>> 294:   const size_t ratio_of_old_in_collection_set = (maximum_young_evacuation_reserve * ShenandoahOldEvacRatioPercent) / (100 - ShenandoahOldEvacRatioPercent);
> 
> It looks like we may get divide-by-zero in the above of ShenandoahOldEvacRatioPercent equals 100

In the original code, we only compute ratio_of_old_in_collection_set if ShenandoahOldEvacRatioPercent != 100

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PR Review Comment: https://git.openjdk.org/jdk/pull/27632#discussion_r2408872507