RFR: 8318619: GenShen: Add configurable threshold for young triggers to expedite old evacuations

[Kelvin Nilsen]

On Fri, 20 Oct 2023 20:29:48 GMT, William Kemper <wkemper at openjdk.org> wrote:

> When Shenandoah expects to free up space by promotions into young, or evacuations in old it may trigger a young collection. This change sets configurable thresholds for these conditions.

Thanks.

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Marked as reviewed by kdnilsen (Committer).

PR Review: https://git.openjdk.org/shenandoah/pull/347#pullrequestreview-1693203804