--- a/src/hotspot/share/gc/parallel/parallelScavengeHeap.cpp	Wed Jul 31 13:40:59 2019 -0400
+++ b/src/hotspot/share/gc/parallel/parallelScavengeHeap.cpp	Wed Jul 31 14:28:51 2019 -0400
@@ -520,6 +520,10 @@
     full_gc_count = total_full_collections();
   }
 
+  if (GCLocker::should_discard(cause, gc_count)) {
+    return;
+  }
+
   VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause);
   VMThread::execute(&op);
 }