RFR: 8349836: G1: Improve group prediction log message

[Ivan Walulya]

On Tue, 11 Feb 2025 15:29:03 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this minor change to the group prediction log message
> printed with gc+ergo+cset=trace:
> 
>   * add group id to be able to refer to something concrete when discussing results
>   * add total time
>   * fix typo in `bytes_to_cop`
> 
> Testing: gha, local verification
> 
> `Group 10: 5 regions prediction total_time 20.0ms card_rs_length 123456 merge_scan_time 10.2ms code_root_scan_time_ms 5.5ms evac_time_ms 3.7ms other_time 0.3ms bytes_to_copy 1234567`
> 
> instead of
> 
> `Prediction for group with 76 regions, card_rs_length 320, merge_scan_time 0.02ms, code_root_scan_time_ms 0.00ms, evac_time_ms 9.92ms, other_time 45.60ms, bytes_to_cop 61408560`
> 
> Thanks,
>   Thomas

Looks good!

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Marked as reviewed by iwalulya (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23562#pullrequestreview-2609634280