[master] RFR: 8319724: [Lilliput] ParallelGC: Forwarded objects found during heap inspection

[Aleksey Shipilev]

On Wed, 8 Nov 2023 15:51:39 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> This is the Lilliput variant of [JDK-8319376](https://bugs.openjdk.org/browse/JDK-8319376). With Lilliput we need special treatment of the fix, because the iterator needs to access the Klass*, which it can only get via the forwardee.
> 
> Testing:
>  - [x] gc/logging/TestUnifiedLoggingSwitchStress.java +UseParallelGC +UCOH
>  - [x] gc/logging/TestUnifiedLoggingSwitchStress.java +UseParallelGC -UCOH
>  - [ ] hotspot_gc +UCOH
>  - [ ] tier1 +UCOH
>  - [ ] tier2 +UCOH

src/hotspot/share/gc/parallel/mutableSpace.cpp line 254:

> 252:         p += obj->forwardee()->size();
> 253:       } else {
> 254:         p += obj->size();

Is this just `oopDesc::forward_safe_size()`?

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PR Review Comment: https://git.openjdk.org/lilliput/pull/116#discussion_r1386875673