RFR: 8364532: G1: In liveness tracing, print more significant digits for the liveness value [v4]

[Albert Mingkun Yang]

On Thu, 7 Aug 2025 09:35:27 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Hi all,
>> 
>>   please review this small change that adds some more significant digits (3 in total) for the "liveness" column in collection set group logging.
>> 
>> E.g. see the emphasized columns that lack precision (it's more irritating with lots of lines showing single-digit values):
>> 
>> 50.707s][trace][gc,liveness] GC(13) ### groud-id num-regions gc-eff liveness remset type
>> 50.707s][trace][gc,liveness] GC(13) ### (bytes/ms) % (bytes)
>> 50.707s][trace][gc,liveness] GC(13) ### 1 70       0.0 *100* 3199208 Y
>> 50.707s][trace][gc,liveness] GC(13) ### 2 51 5298129.5  *18* 1224072 M
>> 50.707s][trace][gc,liveness] GC(13) ### 3  5 3223983.6  *31*  176648 M
>> 50.707s][trace][gc,liveness] GC(13) ### 4  5 3022016.3  *32*  176648 M
>> 
>> 
>> (This depends on PR#26591, so please look at that one first).
>> 
>> The change makes sure that three significant digits are printed.
>> 
>> Testing: manual review
>> 
>> Thanks,
>>   Thomas
>
> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
> 
>   * ayang suggestion to avoid exponential output

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26595#pullrequestreview-3096266562