RFR: 8305895: Implement JEP 450: Compact Object Headers (Experimental) [v18]

[Thomas Stuefe]

On Wed, 11 Sep 2024 11:40:24 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> Roman Kennke has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 57 commits:
>> 
>>  - fix CompressedClassPointersEncodingScheme yet again for linux aarch64
>>  - Fixes post-8340184
>>  - Merge upstream up to and including 8340184
>>  - Merge remote-tracking branch 'origin/master' into JDK-8305895-v4
>>  - Fix  test/hotspot/jtreg/runtime/CompressedOops/CompressedClassPointersEncodingScheme.java
>>  - Fix loop on aarch64
>>  - clarify obscure assert in metasapce setup
>>  - Rework compressedklass encoding
>>  - remove stray debug output
>>  - Fixes post 8338526
>>  - ... and 47 more: https://git.openjdk.org/jdk/compare/7849f252...28a26aed
>
> src/hotspot/share/memory/metaspace/metaspaceArena.hpp line 44:
> 
>> 42: class FreeBlocks;
>> 43: 
>> 44: struct ArenaStats;
> 
> Nit: Sort?

ok

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

PR Review Comment: https://git.openjdk.org/jdk/pull/20677#discussion_r1762994972