RFR: 8327097: GenShen: Align PLAB sizes down rather than up [v6]

[Kelvin Nilsen]

On Wed, 20 Mar 2024 22:51:52 GMT, Y. Srinivas Ramakrishna <ysr at openjdk.org> wrote:

>> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add comments to clarify behavior of retire_plab
>
> src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp line 1103:
> 
>> 1101:   assert(mode()->is_generational(), "PLABs only relevant to generational GC");
>> 1102:   ShenandoahGenerationalHeap* generational_heap = (ShenandoahGenerationalHeap*) this;
>> 1103:   size_t plab_min_size = generational_heap->plab_min_size();
> 
> const

Thanks.  Done.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/401#discussion_r1535991319