RFR: JDK-8289524: Add JFR JIT restart event [v3]

[Lutz Schmidt]

On Thu, 14 Jul 2022 17:03:14 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Bring back JitRestart event, add codeCacheMaxCapacity
>
> src/hotspot/share/jfr/metadata/metadata.xml line 563:
> 
>> 561:   <Event name="JitRestart" category="Java Virtual Machine, Compiler" label="JIT restart" stackTrace="false" startTime="false" thread="true">
>> 562:     <Field type="int" name="freedMemory" label="Freed Memory" />
>> 563:     <Field type="ulong" name="codeCacheMaxCapacity" label="CodeCache maximum capacity" />
> 
> Is codeCacheMaxCapacity the current in-use size of the CodeCache, in bytes? It should have the contentType="bytes" in that case. Also "freedMemory" should have the same contentType.

Yes, codeCacheMaxCapacity is given in bytes. It specifies the maximum size, not the current in-use size, of the CodeCache. It is the sum over all CodeHeap segments.

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PR: https://git.openjdk.org/jdk/pull/9334