RFR: 8330198: Add some class loading related perf counters to measure VM startup [v3]

[David Holmes]

On Fri, 24 May 2024 05:20:48 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> Surely this needs to be checking `ProfileClassLinkage`, which in turn should be false if `UsePerfData` is false.
>
> If `UsePerfData` is set to false, `ProfileClassLinkage` is set to false in arguments.cpp:
> 
> 
> 3761   if (ProfileClassLinkage && !UsePerfData) {
> 3762     if (!FLAG_IS_DEFAULT(ProfileClassLinkage)) {
> 3763        warning("Disabling ProfileClassLinkage since UsePerfData is turned off.");
> 3764        FLAG_SET_DEFAULT(ProfileClassLinkage, false);
> 3765      }
> 3766   }
> 
> 
> I will remove the extra parentheses.

Yes but if  `UsePerfData` is true it doesn't mean `ProfileClassLinkage` is true.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18790#discussion_r1612951635