JDK-8048248 : [Backed out] 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: 2014-06-26
  • Updated: 2014-08-29
  • Resolved: 2014-07-07
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9 b24Fixed
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[This bug was backed out and pushed as JDK-8049421 instead]

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.
This bug (JDK-8048248) was pushed with a missing Contributed-by line and was therefore backed out as JDK-8049420. JDK-8049421 is a resubmit with the correct attribution.