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

[David Holmes]

On Thu, 23 May 2024 22:17:43 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   comments from Ioi
>
> src/hotspot/share/classfile/classLoader.cpp line 1477:
> 
>> 1475: 
>> 1476: jlong ClassLoader::class_init_count() {
>> 1477:   return (UsePerfData) ? _perf_classes_inited->get_value() : -1;
> 
> No need to add brackets here

Surely this needs to be checking `ProfileClassLinkage`, which in turn should be false if `UsePerfData` is false.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18790#discussion_r1612399712