RFR: 8328792: Parallel: Refactor PSParallelCompact::summary_phase [v9]

[Albert Mingkun Yang]

On Wed, 10 Apr 2024 08:07:20 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> The diff is not easy to follow; it's better to read the new code directly. `summary_phase` contains the gist of collecting live-size from each space, calculating dense-prefix and summarizing old-space using dense-prefix.
>> 
>> (There is slight improvement to the "Summary Phase", but it takes only ~0.01ms for either case.)
>
> Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:
> 
>   pgc-compute-dense-prefix

We can revisit around `_maximum_compaction_gc_num` after further cleanups in this area.

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/18451#issuecomment-2056865628