RFR: 8254854: [cgroups v1] Metric limits not properly detected on some join controller combinations

[Bob Vandette]

On Thu, 22 Oct 2020 14:25:28 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

>> Originally only join controllers of form `cpu,cpuacct` would have been recognized.
>> However, this fails if more controllers are joined at a certain path.
>> 
>> The proposed fix is to be sure to split join controllers on `,` and set the path
>> accordingly. Otherwise, the Metrics system might be initialized due to some
>> non-join controllers, yet the limits for join controllers wouldn't be detected. A
>> test for this can be added once [JDK-8254001](https://bugs.openjdk.java.net/browse/JDK-8254001) has been implemented.
>> 
>> Testing:
>> 
>> - [x] jdk/submit
>> - [x] container tests on Linux cgroups v1 system.
>> 
>> Thoughts?
>
> @bobvandette Could you please take a look? It would be much appreciated.

How does this cgroup file get parsed properly in the hotspot side of things?  I don't see more than one controller getting registered per line???

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PR: https://git.openjdk.java.net/jdk/pull/809