8268537: (Temporary) Disable ParallelRefProcEnabled for Parallel GC

Reviewed-by: stefank, sjohanss

Author: lkorinth

src/hotspot/share/gc/parallel/parallelArguments.cpp

@@ -87,7 +87,7 @@ void ParallelArguments::initialize() {
   }
 
   if (FLAG_IS_DEFAULT(ParallelRefProcEnabled) && ParallelGCThreads > 1) {
-    FLAG_SET_DEFAULT(ParallelRefProcEnabled, true);
+    //FLAG_SET_DEFAULT(ParallelRefProcEnabled, true);
   }
 }
 

test/hotspot/jtreg/gc/arguments/TestParallelRefProc.java

@@ -51,7 +51,7 @@ public static void main(String args[]) throws Exception {
         }
         if (GC.Parallel.isSupported()) {
             noneGCSupported = false;
-            testFlag(new String[] { "-XX:+UseParallelGC" }, true);
+            testFlag(new String[] { "-XX:+UseParallelGC" }, false);
         }
         if (GC.G1.isSupported()) {
             noneGCSupported = false;