RFR: JDK-8266490: Extend the OSContainer API to support the pids controller of cgroups [v2]

[Severin Gehwolf]

On Wed, 23 Jun 2021 13:38:58 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> But I think that the testing needs to be enhanced (e.g. with some added docker tests?). Do you have some good suggestions
> where I could look at existing (docker?) tests and adjust those for the new pids.max ?

Have a look at `test/hotspot/jtreg/containers/docker/TestMisc.java` which already does some assertions on `print_container_info()` output. Either extend that test with some actual pid limits (`--pids-limit=` option) in place or write a similar one. That would cover the hotspot side.

Then consider adding the pids limit to the `-Xshowsettings:system` output (see `LauncherHelper.printSystemMetrics()`) using the Java API and add a docker test using that in `test/jdk/jdk/internal/platform/docker/`.

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PR: https://git.openjdk.java.net/jdk/pull/4518