RFR: 8300926: Several startup regressions ~6-70% in 21-b6 all platforms [v4]

[Robbin Ehn]

On Tue, 21 Feb 2023 15:11:01 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Coleen fix
>
> src/hotspot/share/classfile/systemDictionary.cpp line 1614:
> 
>> 1612: // before a new class is used.
>> 1613: 
>> 1614: void SystemDictionary::add_to_hierarchy(InstanceKlass* k, JavaThread* current) {
> 
> Since you're changing add_to_hierarchy so much, I think you might as well move it to InstanceKlass also.
> 
> These changes look good. Removing the Compile_lock around dictionary update can be done later (at at lower priority).

Hi Coleen, so I looked at moving it to IK.
There will be some additional changes, some method may now be private instead, etc...
You think this should be done here?

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PR: https://git.openjdk.org/jdk/pull/12585