RFR: 8203357 Container Metrics

[Bob Vandette]

Please review the following RFE which adds an internal API, along with jtreg tests that provide 
access to Docker container configuration data and metrics.  In addition to the API which we hope to
take advantage of in the future with Java Flight Recorder and a JMX Mbean, I’ve added an additional
option to -XshowSettings:system than dumps out the container or host cgroup confguration
information.  See the sample output below:

RFE: Container Metrics

https://bugs.openjdk.java.net/browse/JDK-8203357

WEBREV:

http://cr.openjdk.java.net/~bobv/8203357/webrev.00


This commit will also include a fix for the following bug.

BUG: [TESTBUG] Test /runtime/containers/cgroup/PlainRead.java fails

https://bugs.openjdk.java.net/browse/JDK-8203691

WEBREV:

http://cr.openjdk.java.net/~bobv/8203357/webrev.00/test/hotspot/jtreg/runtime/containers/cgroup/PlainRead.java.sdiff.html

SAMPLE USAGE and OUTPUT:

docker run —memory=256m --cpuset-cpus 4-7 -it ubuntu bash
./java -XshowSettings:system
Operating System Metrics:
    Provider: cgroupv1
    Effective CPU Count: 4
    CPU Period: 100000
    CPU Quota: -1
    CPU Shares: -1
    List of Processors, 4 total: 
    4 5 6 7 
    List of Effective Processors, 4 total: 
    4 5 6 7 
    List of Memory Nodes, 2 total: 
    0 1 
    List of Available Memory Nodes, 2 total: 
    0 1 
    CPUSet Memory Pressure Enabled: false
    Memory Limit: 256.00M
    Memory Soft Limit: Unlimited
    Memory & Swap Limit: 512.00M
    Kernel Memory Limit: Unlimited
    TCP Memory Limit: Unlimited
    Out Of Memory Killer Enabled: true

TEST RESULTS:

testing runtime container APIs
Directory "JTwork" not found: creating
Passed: runtime/containers/cgroup/PlainRead.java
Passed: runtime/containers/docker/DockerBasicTest.java
Passed: runtime/containers/docker/TestCPUAwareness.java
Passed: runtime/containers/docker/TestCPUSets.java
Passed: runtime/containers/docker/TestMemoryAwareness.java
Passed: runtime/containers/docker/TestMisc.java
Test results: passed: 6
Results written to /export/users/bobv/jdk11/build/jtreg/JTwork

testing jdk.internal.platform APIs
Passed: jdk/internal/platform/cgroup/TestCgroupMetrics.java
Passed: jdk/internal/platform/docker/TestDockerCpuMetrics.java
Passed: jdk/internal/platform/docker/TestDockerMemoryMetrics.java
Passed: jdk/internal/platform/docker/TestSystemMetrics.java
Test results: passed: 4
Results written to /export/users/bobv/jdk11/build/jtreg/JTwork

testing -XshowSettings:system launcher option
Passed: tools/launcher/Settings.java
Test results: passed: 1


Bob.