RFR: Changes to simplify MU accounting

[Kelvin Nilsen]

On Thu, 11 May 2023 21:58:17 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> This represents a small part of the expand-old-on-demand branch.  By itself, this may result in some performance regression because we no longer use MU (mutator utilization) reports to guide generation sizing decisions.  On the other hand, the guidance provided by MU metrics does not seem to be a very accurate predictor of ideal generation sizes.
>
> src/hotspot/share/gc/shenandoah/shenandoahMmuTracker.cpp line 96:
> 
>> 94: }
>> 95: 
>> 96: void ShenandoahMmuTracker::help_record_concurrent(ShenandoahGeneration* generation, uint gcid, const char *msg) {
> 
> `help_record_concurrent` is a confusing name because this function is also used to record degenerated and full gc cycles. Maybe just `update_utilization`?

Thanks.  Done in expand-old-on-demand.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/274#discussion_r1202939234