JDK-8352969 : G1: Improve testability of optional collections
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2025-03-26
  • Updated: 2025-03-28
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tbdUnresolved
Related Reports
Relates :  
JDK-8352508 - [Redo] G1: Pinned regions with pinned objects only reachable by native code crash VM
Description
JDK-8352508 (and probably in earlier issues as well) showed an issue with reproduceability of optional collections: there is no good way to force optional collections, making us rely on random testing.

This is bad.

Improve the situation; one suggestion has been to introduce a flag that always makes all old gen regions in the collection set part of optional evacuation, exercising this functionality.

As an example this functionality could be used to create a test for JDK-8352508 that verifies optional collections in that scenario too.