Ruby runner uses wrong timer if run under JRuby. about krun HOT 8 CLOSED

diff --git a/truffle/src/main/java/org/jruby/truffle/nodes/core/TrufflePrimitiveNodes.java b/truffle/src/main/java/org/jruby/truffle/nodes/core/TrufflePrimitiveNodes.java
index 356a478..04c4796 100644
--- a/truffle/src/main/java/org/jruby/truffle/nodes/core/TrufflePrimitiveNodes.java
+++ b/truffle/src/main/java/org/jruby/truffle/nodes/core/TrufflePrimitiveNodes.java
@@ -127,6 +127,21 @@ public abstract class TrufflePrimitiveNodes {

     }

+    @CoreMethod(names = "clock_gettime_monotonic", onSingleton = true)
+    public abstract static class MonotonicTimeNode extends CoreMethodArrayArgumentsNode {
+
+        public MonotonicTimeNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        @TruffleBoundary
+        @Specialization
+        public double clockGettimeMonotonic() {
+            return IterationsRunner.JNI_clock_gettime_monotonic();
+        }
+
+    }
+
     @CoreMethod(names = "gc_time", onSingleton = true)
     public abstract static class GCTimeNode extends CoreMethodArrayArgumentsNode {