RFR: Changes to simplify MU accounting

[Y. Srinivas Ramakrishna]

On Thu, 11 May 2023 01:07:11 GMT, Y. Srinivas Ramakrishna <ysr 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.hpp line 90:
> 
>> 88:   // GC utilization during this cycle.
>> 89:   //
>> 90:   // We may redundantly record degen and full, in which case the gcid will repeat.  We log these as FULL.
> 
> Won't `gc_id` also repeat for old_marking_increments too?

Or may be I am misunderstanding what "repeat" means here.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/274#discussion_r1190533222