RFR: 8374364: TestCgroupMetrics.java fails when docker service unavailable [v2]

[Jie Fu]

On Fri, 26 Dec 2025 06:44:38 GMT, SendaoYan <syan at openjdk.org> wrote:

>> Hi all,
>> 
>> Test jdk/internal/platform/cgroup/TestCgroupMetrics.java report fails when the docker service is unavailable. The details shows in jbs issue. I think it's better to call `DockerTestUtils.checkCanTestDocker()` before run this test.
>> 
>> Change has been verified locally. Test-fix only, no risk.
>
> SendaoYan has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Fix year
>  - Move DockerTestUtils.checkCanTestDocker() inside MetricsTester

test/lib/jdk/test/lib/containers/cgroup/MetricsTester.java line 86:

> 84: 
> 85:     public static void main(String[] args) throws Exception {
> 86:         DockerTestUtils.checkCanTestDocker();

Thanks for the update.

Can you explain why here requires docker service directly?

>From the logs in JBS, I guess the places should be where the following docker files are required?

Unable to open : /sys/fs/cgroup/cpu,cpuacct/system.slice/sshd.service/cpu.cfs_period_us
Unable to open : /sys/fs/cgroup/cpu,cpuacct/system.slice/sshd.service/cpu.cfs_quota_us
Unable to open : /sys/fs/cgroup/cpu,cpuacct/system.slice/sshd.service/cpu.stat

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PR Review Comment: https://git.openjdk.org/jdk/pull/28996#discussion_r2647686625