RFR: 81820709 - Container Awareness JEP

[Bob Vandette]

Here is a first pass at an implementation of the Container Awareness JEP.
This JEP adds an implementation of an internal API for the extraction of system metrics
for processes running in Isolation Groups (Containers).  The plan is to get the internal 
API integrated in JDK 11 with support for Linux x64 and then follow this work up with support
for alternate platforms, the addition of a JMX MBean and Java Flight Recorder.


JEP:

https://bugs.openjdk.java.net/browse/JDK-8182070


JAVADOC:

http://cr.openjdk.java.net/~bobv/8182070/v01/javadoc/jdk/internal/platform/Metrics.html


WEBREV:

http://cr.openjdk.java.net/~bobv/8182070/v01/webrev


WEBREV including a Prototype MBEAN for exposing these Metrics:

This prototype will not be integrated as part of this JEP.  It’s for information only.

http://cr.openjdk.java.net/~bobv/8182070/v01/mbean-proto/


This feature adds a new -XshowSetting option “system” which displays the
available system Metrics.    

% java -XshowSettings:system

Operating System Metrics:
    Provider: cgroupv1
    Effective CPU Count: 24
    CPUTime per Processor: 
    [0]: 52805305 (ns)
    [1]: 70799492 (ns)
    [2]: 27449618 (ns)
    [3]: 12957734 (ns)
    [4]: 38382720 (ns)
    [5]: 20325731 (ns)
    [6]: 36374924 (ns)
    [7]: 40279640 (ns)
    [8]: 17557347 (ns)
    [9]: 19056675 (ns)
    [10]: 66185888 (ns)
    [11]: 56539480 (ns)
    [12]: 10009386 (ns)
    [13]: 19139797 (ns)
    [14]: 2257349 (ns)
    [15]: 8712468 (ns)
    [16]: 10306911 (ns)
    [17]: 9814800 (ns)
    [18]: 3516611 (ns)
    [19]: 747174 (ns)
    [20]: 4380756 (ns)
    [21]: 11803118 (ns)
    [22]: 1076297 (ns)
    [23]: 8069315 (ns)

    CPU Usage is: 550599580 (ns)
    CPU User Usage is: 36 (ticks)
    CPU System Usage is: 10 (ticks)
    CPU Period: 100000
    CPU Quota: -1
    CPU Shares: -1
    CPU Number of Periods: 0
    CPU Number of Throttled Periods: 0
    CPU Throttled Time: 0
    CPUSet Exclusive: false
    CPUSet Memory Exclusive: false
    List of Processors, 24 total: 
    0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 
    List of Effective Processors, 24 total: 
    0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 
    List of Memory Nodes, 2 total: 
    0 1 
    List of Available Memory Nodes, 2 total: 
    0 1 
    CPUSet Memory Pressure Enabled: false
    CPUSet Memory Pressure: 0.0
    Memory Failed Count: 0
    Memory Limit: Unlimited
    Memory Used: 43.31M
    Max Memory Used: 48.82M
    Memory Soft Limit: Unlimited
    Memory & Swap Failed Count: 0.00K
    Memory & Swap Limit: Unlimited
    Memory & Swap Used: 43.93M
    Max Memory & Swap Used: 48.82M
    Kernel Memory Failed Count: 0.00K
    Kernel Memory Limit: Unlimited
    Kernel Memory Used: 0.00K
    Kernel Max Memory Used: 0.00K
    TCP Memory Failed Count: 0.00K
    TCP Memory Limit: Unlimited
    TCP Memory Used: 0.00K
    TCP Max Memory Used: 0.00K
    Out Of Memory Killer Enabled: true
    BLKIO: Number of I/O Operations Completed: 42
    BLKIO: Bytes Transferred from disk: 4923392

Bob Vandette