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  1. JDK
  2. JDK-8207843

SA: Add support for Object Histogram with ZGC

    Details

    • Type: Enhancement
    • Status: Closed
    • Priority: P4
    • Resolution: Duplicate
    • Affects Version/s: 11, 12
    • Fix Version/s: tbd
    • Component/s: hotspot
    • Labels:

      Description

      HSDB cannot show Object Histogram in the process which is working with ZGC.


      How to reproduce:

        1. Run debuggee with -XX:+UnlockExperimentalVMOptions -XX:+UseZGC

        2. Attach HSDB to the debuggee
          $ jhsdb hsdb --pid <PID>

        3. Show Object Histogram
          [Tools] -> [Object Histogram]


      Exception on HSDB console:

      ```
      sun.jvm.hotspot.utilities.AssertionFailure: Unexpected CollectedHeap type: sun.jvm.hotspot.gc.z.ZCollectedHeap
      at jdk.hotspot.agent/sun.jvm.hotspot.utilities.Assert.that(Assert.java:32)
      at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.collectLiveRegions(ObjectHeap.java:448)
      at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.iterate(ObjectHeap.java:173)
      at jdk.hotspot.agent/sun.jvm.hotspot.HSDB$VisitHeap.run(HSDB.java:1741)
      at jdk.hotspot.agent/sun.jvm.hotspot.utilities.WorkerThread$MainLoop.run(WorkerThread.java:70)
      at java.base/java.lang.Thread.run(Thread.java:832)
      ```

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              • Assignee:
                ysuenaga Yasumasa Suenaga
                Reporter:
                ysuenaga Yasumasa Suenaga
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                Dates

                • Created:
                  Updated:
                  Resolved: