RFR: 8313332: Simplify lazy jmethodID cache in InstanceKlass [v4]

[Coleen Phillimore]

On Thu, 4 Apr 2024 00:07:34 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> This change simplifies the code that grows the jmethodID cache in InstanceKlass.  Instead of lazily, when there's a rare request for a jmethodID for an obsolete method, the jmethodID cache is grown during the RedefineClasses safepoint.  The InstanceKlass's jmethodID cache is lazily allocated when there's a jmethodID allocated, so not every InstanceKlass has a cache, but the growth now only happens in a safepoint.  This code will become racy with the potential change for deallocating jmethodIDs.
>> 
>> Tested with tier1-4, vmTestbase/nsk/jvmti java/lang/instrument tests (in case they're not in tier1-4).
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Two more.

I've run through tiers 5-7 with the patch now.  Thank you for the reviews Alex, Serguei and Dan.

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

PR Comment: https://git.openjdk.org/jdk/pull/18549#issuecomment-2037185846