RFE: https://bugs.openjdk.java.net/browse/JDK-8231947 Fix: https://cr.openjdk.java.net/~shade/8231947/webrev.02/ This was enabled for a while now. Flag is changed to diagnostic, comment updated, the accessors renamed to make more sense. Testing: hotspot_gc_shenandoah, new test -- Thanks, -Aleksey