RFR: 8305895: Implement JEP 450: Compact Object Headers (Experimental) [v3]

[Stefan Karlsson]

On Thu, 22 Aug 2024 17:30:14 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove hashcode leftovers from SA
>
> src/hotspot/share/gc/serial/serialArguments.cpp line 33:
> 
>> 31: void SerialArguments::initialize_heap_flags_and_sizes() {
>> 32:   GenArguments::initialize_heap_flags_and_sizes();
>> 33:   GCForwarding::initialize_flags(MaxNewSize + MaxOldSize);
> 
> Can one use `MaxHeapSize` here?

Good catch. This is actually a bug that is causing the CDS tests to fail. The used variables have not yet been initialized at this point. I tried making the suggested change and that fixed at least one of the CDS failures.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20677#discussion_r1738101667