RFR: JDK-8266490: Extend the OSContainer API to support the pids controller of cgroups [v6]

[Severin Gehwolf]

On Tue, 27 Jul 2021 10:25:22 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> What do you think about accepting, when setting -1/unlimited, a high limit number like 20.000+ as well (and and a comment that on some setups unlimited means just "high number" but not unlimited?

This seems most reasonable. I'd suggest to accept a limit of `> 20000` or `Unlimited` in the test output. In case of it NOT being `Unlimited` for the `--pids-limit=-1` case, I'd also include the actual output in logs with a message that it got accepted as unlimited.

> Another Idea I had was to start a little test java program that creates e.g. 50.000 (or another high number) of threads. If this fails with "unilimited" pids-limit set, we might have a setup like yours and then skip the test (or accept a high number like I suggested).

This seems overkill and prone to failures, IMHO.

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