RFR: 8319376: ParallelGC: Forwarded objects found during heap inspection [v5]

[Albert Mingkun Yang]

On Tue, 7 Nov 2023 14:59:48 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> See JBS issue for details.
>> 
>> Testing:
>>  - [x] gc/logging/TestUnifiedLoggingSwitchStress.java -XX:+UseParallelGC
>>  - [x] tier1 -XX:+UseParallelGC
>>  - [ ] tier2 -XX:+UseParallelGC
>>  - [ ] hotspot_gc
>
> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review comments; expose self-forwarded objects

src/hotspot/share/gc/parallel/mutableSpace.cpp line 242:

> 240:     // so we can encounter objects with "forwarded" markword.
> 241:     // They are essentially dead, so skipping them
> 242:     if (!obj->is_forwarded() || obj->forwardee() == obj) {

Self-forwarded ones should already be handled by `PSPromotionManager::restore_preserved_marks`, so the second condition will always be false.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/16494#discussion_r1385076675