RFR: 8317562: [JFR] Compilation queue statistics [v2]

[Mat Carter]

On Wed, 18 Oct 2023 17:35:59 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Mat Carter has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fixed return type and changed NULL to nullptr
>
> src/hotspot/share/compiler/compileBroker.cpp line 530:
> 
>> 528:   return _c2_compile_queue;
>> 529: }
>> 530: 
> 
> Note, `*_compiler_queue` could be `nullptr` if VM is build without C2 or C1 or when run with `-XX:-TieredCompilation` (only C2 is used) or with `-XX:TierdStopAtLevel={1,2,3}` (only C1 is used).
> 
> Make sure you check it in JFR event.

Thank you!  The JFR event does check for NULL (now nullptr)

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PR Review Comment: https://git.openjdk.org/jdk/pull/16211#discussion_r1364317003