RFR: 8256419: ZGC: Remove "Heap Used Before/After Mark/Relocation" samplers

[Stefan Karlsson]

On Mon, 16 Nov 2020 21:14:30 GMT, Per Liden <pliden at openjdk.org> wrote:

> I propose that we remove the following stat samplers:
> 
> - Heap Used Before Mark
> - Heap Used After
> - Heap Used Before Relocation
> - Heap Used After Relocation
> 
> The simple reason is that they aren't very useful. Looking at the heap statistics table gives a much better overview of what the heap usage has looked like.

The ZStateSamples are reported through JFR (if the events are turned on). Is there something else that reports the heap usage to JFR recordings?

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PR: https://git.openjdk.java.net/jdk/pull/1239