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  1. JDK
  2. JDK-8043764

JEP 228: Add More Diagnostic Commands

    Details

    • JEP Type:
      Feature
    • Exposure:
      Open
    • Subcomponent:
      svc
    • Scope:
      Implementation
    • Discussion:
      serviceability dash dev at openjdk dot java dot net
    • Effort:
      S
    • Duration:
      M
    • Alert Status:
       Green
    • JEP Number:
      228

      Description

      Summary

      Define additional diagnostic commands, in order to improve the diagnosability of Hotspot and the JDK.

      Description

      This is a list of the new commands (exact names are TBD):

      print_class_summary

      • Print a list of all loaded classes and their inheritence structure.
      • Responsible group: runtime

      print_codegenlist

      • Print methods queued for compilation with either C1 or C2 (separate queues)
      • Responsible group: compiler

      print_utf8pool

      • Print all UTF-8 string constants.
      • Responsible group: runtime

      datadump_request

      • Signal the JVM to do a data-dump request for JVMTI.
      • Responsible group: serviceability

      dump_codelist

      • Print n-methods (compiled) with full signature, address range, and state (alive, nonentrant, and zombie).
      • Allow selection of printing to stdout or to a file.
      • Allow XML or text printout.
      • Responsible group: compiler

      print_codeblocks

      • Print the size of the code cache and a list of blocks in the code cache, with adresses.
      • Responsible group: compiler

      set_vmflag

      • Set a command-line flag/option in VM or the libraries.
      • Responsible group: servicability

      Testing

      There needs to be a test for each command to verify the output.

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              • Assignee:
                sla Staffan Larsen (Inactive)
                Reporter:
                sla Staffan Larsen (Inactive)
                Owner:
                Staffan Larsen (Inactive)
                Reviewed By:
                Mikael Vidstedt
                Endorsed By:
                Mikael Vidstedt
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                Dates

                • Due:
                  Created:
                  Updated:
                  Resolved:
                  Integration Due: