RFR: 8308633: Increase precision of timestamps in g1 log

[Albert Mingkun Yang]

On Wed, 21 Jun 2023 15:19:41 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this improvement adding a digit to log timestamp to improve output. On modern machines, for some pauses, this can lead to sub-phase timings not adding up, and during development, extra work to evaluate different options.
> Also that rounding error starts to matter for e.g. pauses < a few ms. 
> 
> I am aware that there is a duplication of the timestamp format in the files, and this change did not improve that as this would be a different issue. Not sure where to put such a global constant though, any suggestions?
> 
> Testing: gha, looking at log files
> 
> Thanks,
>   Thomas

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14594#pullrequestreview-1493245098