JDK-8218922 : SA: Enable best-effort implementation of live regions iteration for ZGC
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: svc-agent
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2019-02-13
  • Updated: 2020-01-22
  • Resolved: 2019-02-19
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JDK 13
13 b09Fixed
Related Reports
Blocks :  
JDK-8219003 - SA: Refactor live regions iteration in preparation for JDK-8218922
Duplicate :  
JDK-8221534 - Incorrect copyright header in src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZPageTableEntry.java
Duplicate :  
JDK-8207843 - SA: Add support for Object Histogram with ZGC
Description
The SA has functionally that relies on live heap region information from the GCs. This is problematic when dead objects are left in the heap, and their classes have been unloaded.

Because of this ZGC has so far not implemented this feature. However, we could provide a best-effort implementation of this that works if class unloading is turned off, but would not report all regions if dead objects with dead classes are encountered.

Maybe this is enough to enable a bit more SA debugging capabilities when running with ZGC.