RFR: 8330071: GenShen: Allow old to expand again at end of each GC [v2]

[Y. Srinivas Ramakrishna]

On Thu, 11 Apr 2024 16:12:42 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> This corrects errors in the implementations of max_size_for(OLD) and min_size_for(OLD).  These errors were preventing expansion of OLD in preparation for subsequent mixed-evacuation cycles.
>
> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Spelling errors in comment

What would go wrong if, as indicated in your comments, you were to return `heap - min_young` for `max(old)`, and `heap - max_young` for `min(old)` ?

If nothing would go wrong, why not do that? If something would go wrong if one did that, may be that needs to be documented along with the comment you added.

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PR Review: https://git.openjdk.org/shenandoah/pull/421#pullrequestreview-1995160319