RFR: Generation resizing

[Roman Kennke]

On Sat, 3 Dec 2022 01:09:59 GMT, William Kemper <wkemper at openjdk.org> wrote:

> These changes have the generational mode track the minimum mutator utilization (percentage of process time used by mutators). When it falls below a configuration percentage (GCTimeRatio), a heuristic will transfer memory capacity to whatever generation has been using more CPU time. The assumption here is that by increasing capacity, we will decrease the collection frequency and improve the MMU.

Thanks, William! The PR has merge conflicts, can you resolve them?

Thanks,
Roman

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PR: https://git.openjdk.org/shenandoah/pull/177