RFR: 8339162: [REDO] JDK-8338440 Parallel: Improve fragmentation mitigation in Full GC [v2]

[Zhengyu Gu]

On Sat, 9 Nov 2024 10:51:47 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> This PR consists of two commits, the original and bug-fix.
>> 
>> The original patch calculates the dest-count for the preceding live words incorrectly -- `preceding_destination` can be on region-boundary.
>> 
>> Test: TEST=gc/TestSoftReferencesBehaviorOnOOME.java fails ~4/100 without the fix but passes with the fix.
>
> 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 three commits:
> 
>  - Merge branch 'master' into pgc-redo
>  - fix
>  - original

LGTM

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Marked as reviewed by zgu (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21872#pullrequestreview-2425467810