RFR: 8157023: Integrate NMT with JFR

[Thomas Stuefe]

On Fri, 2 Dec 2022 13:56:37 GMT, Jean-Philippe Bempel <jpbempel at openjdk.org> wrote:

> > I think these events will be mostly useful for Hotspot developers and support engineers.
> 
> I respectfully disagree on that. In a container world, it's common to be hit by OOMKill when sizing the JVM correctly. Most people think only by the Java heap size, and forget about the native part. And when you do, there is few control or possible way to troubleshoot why the native part is going off what you expect. The only useful tool in this situation is NMT to be able to triage which space is the culprit. see https://blog.arkey.fr/2020/11/30/off-heap-reconnaissance/

Hi @jpbempel,

this is currently being discussed as part of https://mail.openjdk.org/pipermail/core-libs-dev/2022-December/097391.html and https://mail.openjdk.org/pipermail/core-libs-dev/2022-November/096369.html. Feel free to take part! I am especially interested in seeing concrete examples where NMT did help customers to lower memory footprint.

Cheers, Thomas

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