[jdk21u-dev] RFR: 8333446: Add tests for hierarchical container support

[Severin Gehwolf]

On Fri, 4 Jul 2025 16:00:30 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> Please review this test-only backport. Now that https://bugs.openjdk.org/browse/JDK-8322420 is in jdk21u-dev it makes sense to automatically test this functionality. The patch is clean except for the changes in `VMProps.java` which I've added manually.
> 
> The only non-test tree change is to `whitebox.cpp`.
> 
> Testing:
> - [x] GHA
> - [x] container tests on Linux x86 with cgroups v2 and cgroups v1 (including new systemd ones)
> 
> Thoughts?
> 
> Note: I'll follow up with [JDK-8340092](https://bugs.openjdk.org/browse/JDK-8340092) once this is in.

@MBaesken You helped review this in mainline, could you help out with a review here? It's a test-only change. Thank you!

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/1938#issuecomment-3044416795