RFR: 8351892: GenShen: Remove enforcement of generation sizes [v2]

[William Kemper]

On Sat, 29 Mar 2025 00:08:06 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Don't let old have the entire heap
>
> src/hotspot/share/gc/shenandoah/shenandoahGenerationalFullGC.cpp line 120:
> 
>> 118:   if (old_capacity > old_usage) {
>> 119:     size_t excess_old_regions = (old_capacity - old_usage) / ShenandoahHeapRegion::region_size_bytes();
>> 120:     gen_heap->transfer_to_young(excess_old_regions);
> 
> should we assert result is successful?  Or replace with force_transfer?  (just seems bad practice to ignore a status result)

Yes, will try an assert here.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24268#discussion_r2023754542