RFR: 8157023: Integrate NMT with JFR [v4]

[Stefan Johansson]

On Wed, 7 Dec 2022 13:21:42 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> Stefan Johansson has updated the pull request incrementally with three additional commits since the last revision:
>> 
>>  - Rename the files
>>  - Renaming and updating comments
>>  - tstuefe review - no rename
>
> src/hotspot/share/jfr/metadata/metadata.xml line 711:
> 
>> 709:   <Event name="NativeMemoryUsage" category="Java Virtual Machine, Memory" label="Native Memory Usage Per Type"
>> 710:     description="Native memory usage for a given memory type in the JVM" period="everyChunk">
>> 711:     <Field type="string" name="type" label="Memory Type" description="Type used for the native memory allocation" />
> 
> Suggest turning this type "string" into a JFR-constant type, like "JfrNMTType" to only send id's, instead of the entire strings. Can be done in a follow-up change.

I prefer to do this at a later point, created [JDK-8298278](https://bugs.openjdk.org/browse/JDK-8298278) to track this.

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PR: https://git.openjdk.org/jdk/pull/11449