RFR: 8295839: G1: Single threaded phases (within parallel phases) report as using multiple threads in logs

[Thomas Schatzl]

On Mon, 24 Oct 2022 15:21:14 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I have reviews for this change that changes log output to properly report single-threaded (sub-)phases  number of threads?
>> 
>> E.g.
>> 
>>  [87.104s][debug][gc,phases] GC(1412) Ext Root Scanning (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1, Workers: 6
>> [...]
>> [87.104s][trace][gc,phases] GC(1412) CLDG Roots (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0, Workers: 1
>> [87.104s][trace][gc,phases] GC(1412) CM RefProcessor Roots (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0, Workers: 1
>> [...] 
>> 
>> instead of
>> 
>>  [87.104s][debug][gc,phases] GC(1412) Ext Root Scanning (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1, Workers: 6
>> [...]
>> [87.104s][trace][gc,phases] GC(1412) CLDG Roots (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0, Workers: 6
>> [87.104s][trace][gc,phases] GC(1412) CM RefProcessor Roots (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0, Workers: 6
>> [...] 
>> 
>> 
>> Testing: local testing of some log files, gha
>> 
>> Thanks,
>>   Thomas
>
> Marked as reviewed by iwalulya (Reviewer).

Thanks @walulyai @albertnetymk for your reviews.

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PR: https://git.openjdk.org/jdk/pull/10833