[jdk17u-dev] RFR: 8283710: JVMTI: Use BitSet for object marking [v2]

[Christoph Langer]

On Thu, 20 Jul 2023 15:46:06 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> This is a backport of [JDK-8283710](https://bugs.openjdk.org/browse/JDK-8283710) to 17u.
>> 
>> There have been contextual differences around the declaration of _bitset and corresponding contextual differences in the constructor: the field _dead_objects did not exist in jdk19, but does exist in jdk17u. There also have been differences in the large block that has been removed (the whole of ObjectMarker and related code). Other than that, the backport has been clean and straightforward.
>> 
>> Testing:
>>  - [x] tier1
>>  - [x] tier2
>>  - [x] serviceability/jvmti
>>  - [x] serviceability/jdwp
>>  - [x] vmTestbase/nsk/jvmti
>>  - [x] vmTestbase/msk/jdwp
>
> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix copyright and include guards in jfrbitset.hpp

I will run this through our nigthlies to verify...

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PR Comment: https://git.openjdk.org/jdk17u-dev/pull/1602#issuecomment-1659810214