8290839: jdk/jfr/event/compiler/TestJitRestart.java failed with "Runt…

…imeException: No JIT restart event found: expected true, was false"

Reviewed-by: egahlin, lucy

test/jdk/jdk/jfr/event/compiler/TestJitRestart.java

@@ -24,6 +24,7 @@
 package jdk.jfr.event.compiler;
 
 import java.util.List;
+import java.util.Comparator;
 
 import jdk.jfr.Recording;
 import jdk.jfr.consumer.RecordedEvent;
@@ -50,22 +51,23 @@
 public class TestJitRestart {
 
     public static void main(String[] args) throws Exception {
-        boolean foundJitRestart = false;
+        boolean checkJitRestartCompilation = false;
         for (BlobType btype : BlobType.getAvailable()) {
             boolean jr = testWithBlobType(btype, calculateAvailableSize(btype));
             if (jr) {
-                System.out.println("JIT restart event found for BlobType " + btype);
-                foundJitRestart = true;
+                System.out.println("JIT restart event / Compilation event check for BlobType " + btype + " was successful");
+                checkJitRestartCompilation = true;
             }
         }
-        Asserts.assertTrue(foundJitRestart, "No JIT restart event found");
+        Asserts.assertTrue(checkJitRestartCompilation, "No JIT restart event found and unexpected compilation seen");
     }
 
     private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
 
     private static boolean testWithBlobType(BlobType btype, long availableSize) throws Exception {
         Recording r = new Recording();
         r.enable(EventNames.CodeCacheFull);
+        r.enable(EventNames.Compilation);
         r.enable(EventNames.JitRestart);
         r.start();
         long addr = WHITE_BOX.allocateCodeBlob(availableSize, btype.id);
@@ -74,18 +76,34 @@ private static boolean testWithBlobType(BlobType btype, long availableSize) thro
         r.stop();
 
         List<RecordedEvent> events = Events.fromRecording(r);
+        System.out.println("---------------------------------------------");
         System.out.println("# events:" + events.size());
         Events.hasEvents(events);
+        events.sort(Comparator.comparing(RecordedEvent::getStartTime));
 
+        boolean compilationCanHappen = true;
         for (RecordedEvent evt: events) {
             System.out.println(evt);
+            if (evt.getEventType().getName().equals("jdk.CodeCacheFull")) {
+                System.out.println("--> jdk.CodeCacheFull found");
+                compilationCanHappen = false;
+            }
+            if (evt.getEventType().getName().equals("jdk.Compilation") && !compilationCanHappen) {
+                return false;
+            }
             if (evt.getEventType().getName().equals("jdk.JitRestart")) {
+                System.out.println("--> jdk.JitRestart found");
                 Events.assertField(evt, "codeCacheMaxCapacity").notEqual(0L);
                 Events.assertField(evt, "freedMemory").notEqual(0L);
+                System.out.println("JIT restart event found for BlobType " + btype);
                 return true;
             }
         }
-        return false;
+        System.out.println("---------------------------------------------");
+
+        // in some seldom cases we do not see the JitRestart event; but then
+        // do not fail (as long as no compilation happened before)
+        return true;
     }
 
     // Compute the available size for this BlobType by taking into account