RFR: JDK-8320336: GenShen: Reduce proactive humongous defragmentation efforts

[William Kemper]

On Fri, 17 Nov 2023 17:15:32 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> Only trigger defragmentation of old-gen memory if JVM is configured to reserve a certain amount of the heap to support humongous objects.  Even when the JVM is so configured, be slightly less aggressive in triggering defragmentation of old-gen memory.

Looks good to me.

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Marked as reviewed by wkemper (Committer).

PR Review: https://git.openjdk.org/shenandoah/pull/361#pullrequestreview-1738041538