JDK-8049421 : G1 Class Unloading after completing a concurrent mark cycle
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 9
  • Priority: P2
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2014-07-07
  • Updated: 2017-11-19
  • Resolved: 2014-07-07
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JDK 8 JDK 9
8u40Fixed 9 b24Fixed
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Description
Currently G1 treats all classes as live except for during full gcs.

Modify the concurrent marking code to keep track of liveness of classes in order to be able to unload unreachable classes at the remark pause.
This involves reusing the infrastructure used by CMS to follow the object headers to find live classes.