RFR: 8305895: Implement JEP 450: Compact Object Headers (Experimental) [v6]

[Roman Kennke]

On Mon, 9 Sep 2024 10:16:24 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix bit counts in GCForwarding
>
> src/hotspot/share/gc/shared/gcForwarding.hpp line 41:
> 
>> 39:  * bits (to indicate 'forwarded' state as usual).
>> 40:  */
>> 41: class GCForwarding : public AllStatic {
> 
> Since this class is only used for Full GCs, it may be useful to include that information, i.e. something like `FullGCForwarding` to avoid confusion why it is not used for other GCs too.
> (Unless this has been discussed and even rejected by me before).

I agree. In-fact, that has been my original name. It has been suggested that I change it to SlidingForwarding when that was the approach that we were going to take, but with the new implementation, FullGCForwarding makes most sense. I'll change it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20677#discussion_r1751400378