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  1. JDK
  2. JDK-8204107

Add -XshowSettings:system option to display system configuration

    Details

    • Type: CSR
    • Status: Closed
    • Priority: P3
    • Resolution: Approved
    • Fix Version/s: 11
    • Component/s: tools
    • Labels:
      None
    • Subcomponent:
    • Compatibility Kind:
      behavioral
    • Compatibility Risk:
      low
    • Interface Kind:
      add/remove/modify command line option
    • Scope:
      JDK

      Description

      Summary

      A new -XshowSettings:system suboption has been added to display the system or container configuration. This option is only available on Linux systems.

      Problem

      A new jdk.internal.platform API has been introduced in JDK11 that allows the JDK to have access to Linux container or host configuration. This API will most likely be used by tools such as JMX or JFR but It would also be a useful diagnostic tool to allow the -XshowSettings to present the config data to end users.

      Solution

      Add a "system" suboption to -XshowSettings that will dump the system configuration data to stdout.

      Specification

           -XshowSettings:system
                             (Linux Only) show host system or container
                             configuration and continue
      
      On non Linux systems, this suboption will be ignored and all available
      settings will be printed.  This suboption may be supported on non-Linux
      systems when the jdk.internal.platform API implementation support is
      added.
      
      
              The output generated is an implementation detail.  Here is a sample of what 
              might be provided:
      
              Operating System Metrics:
                  Provider: cgroupv1
                  Effective CPU Count: 24
                  CPU Period: 100000
                  CPU Quota: -1
                  CPU Shares: -1
                  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
                  Memory Limit: Unlimited
                  Memory Soft Limit: Unlimited
                  Memory & Swap Limit: Unlimited
                  Kernel Memory Limit: Unlimited
                  TCP Memory Limit: 2048.00T
                  Out Of Memory Killer Enabled: true

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              • Assignee:
                bobv Bob Vandette
                Reporter:
                bobv Bob Vandette
                Reviewed By:
                Mandy Chung
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                Dates

                • Created:
                  Updated:
                  Resolved: