RFR: Generation resizing [v3]

[Roman Kennke]

On Tue, 6 Dec 2022 17:26:08 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.
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove vestigial lock, do not enroll periodic task while holding threads_lock

Looks good to me. Thank you!

EDIT: well actually, it is still complaining about conflict, and you should also make it ready for review ;-)

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Marked as reviewed by rkennke (Lead).

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