JDK-8231111 : Cgroups v2: Rework Metrics in java.base so as to recognize unified hierarchy
- Type: Sub-task
- Component: core-libs
- Affected Version: 8u231,11.0.5,13.0.1,14
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: linux
- CPU: generic
- Submitted: 2019-09-17
- Updated: 2025-06-14
- Resolved: 2020-02-19
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Resolved: Release in which this issue/RFE has been resolved.
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To download the current JDK release, click here.
| JDK 11 | JDK 15 | JDK 8 | Other |
|---|---|---|---|
| 11.0.16-oracleFixed | 15 b11Fixed  |
8u361Fixed | openjdk8u372,shenandoah8u372Fixed |
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Description
Currently, the Linux-only Metrics class in jdk/internal/platform/Metrics.java hard-codes cgroups version 1:
/**
* Returns an instance of the Metrics class.
*
* @return Metrics object or null if not supported on this platform.
*/
public static Metrics systemMetrics() {
try {
// We currently only support cgroupv1
Class<?> c = Class.forName("jdk.internal.platform.cgroupv1.Metrics");
[...]
}
For the cgroups v2 effort this needs to be reworked.
On a F31 system with unified hierarchy only, java -XshowSettings:system look like this:
$ bin/java -XshowSettings:system -version
Operating System Metrics:
No metrics available for this platform
openjdk version "14-internal" 2020-03-17
OpenJDK Runtime Environment (fastdebug build 14-internal+0-adhoc.sgehwolf.jdk-jdk)
OpenJDK 64-Bit Server VM (fastdebug build 14-internal+0-adhoc.sgehwolf.jdk-jdk, mixed mode, sharing)
Comments
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