RFR: 8270014: Add scoped objects for g1 young gc verification and young gc internal timing [v4]

[Kim Barrett]

On Wed, 14 Jul 2021 09:08:38 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I get reviews for some further cleanup of the young collection code:
>> - adding some more scoped objects (verification, gc pause timing)
>> - some naming, minor related code movement
>> 
>> Thanks,
>>   Thomas
>
> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Change note_ to record_

Changes requested by kbarrett (Reviewer).

src/hotspot/share/gc/g1/g1Policy.cpp line 635:

> 633:   G1GCPhaseTimes* p = phase_times();
> 634: 
> 635:   double start_time_s = phase_times()->cur_collection_start_sec();

I dislike this change of nomenclature to use `_s` suffix instead of `_sec` suffix to indicate units of seconds.  The latter is in wide use in GC code.

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PR: https://git.openjdk.java.net/jdk/pull/4768