RFR: Add generations to freeset [v8]

Fri Apr 28 14:08:53 UTC 2023

On Thu, 20 Apr 2023 20:54:58 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> I'm adding a comment to the code to clarify.
>
> Should we have a more restrictive test when rebuilding the freeset? Rather than including regions with non-zero allocation capacity, include only regions with capacity greater than some minimum? (Minimum LAB size, e.g.)

In the very latest revision committed, I have removed the fill object and have taken your suggestion to only install regions into a freeset if available memory is greater than PLAB::min_size().  Thanks.  I think this is cleaner.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/250#discussion_r1180446286