RFR: 8372615: Many container tests fail when running rootless on cgroup v1 [v2]

[Severin Gehwolf]

On Mon, 1 Dec 2025 12:45:06 GMT, Casper Norrbin <cnorrbin at openjdk.org> wrote:

>> Hi everyone,
>> 
>> Many container tests verify that various resource limits work as expected. However, when running containers in rootless mode on both Docker and Podman with cgroup v1, resource limits are not supported. This causes tests to fail with error messages like: `Resource limits are not supported and ignored on cgroups V1 rootless systems`.
>> 
>> To address this, we should skip these tests when running on configurations that don't support resource limits, similar to how we already handle other unsupported configurations (e.g., missing container engine or incompatibility with a specific cgroup version or container runtime).
>> 
>> To check for this, we now need to use `Metrics.systemMetrics().getProvider()` from `jdk.internal.platform.Metrics` to detect cgroup v1. I've added this functionality to `DockerTestUtils`, which is already used by all container tests. As a result, all container tests now need to include the `java.base/jdk.internal.platform` module, even if they don't directly test resource limits.
>> 
>> Testing:
>> * Oracle tiers 1-5
>> * Local testing:
>>   - `hotspot/jtreg/containers/` 
>>   - `jdk/jdk/internal/platform/docker/`
>> on cgroup v1/v2 with Podman and Docker in both rootful and rootless configurations
>
> Casper Norrbin has updated the pull request incrementally with one additional commit since the last revision:
> 
>   reworked check docker/resourcelimit functions

OK

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Marked as reviewed by sgehwolf (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28557#pullrequestreview-3525791884