RFR: Changes to simplify MU accounting

[William Kemper]

On Thu, 11 May 2023 01:07:43 GMT, Y. Srinivas Ramakrishna <ysr at openjdk.org> wrote:

>> 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.

I think only a boot strap cycle and its first old marking increment will have the same `gc_id`.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/274#discussion_r1191713114