8014765: VM exits if MaxTenuringThreshold is set below the default...

8014765: VM exits if MaxTenuringThreshold is set below the default InitialTenuringThreshold, and InitialTenuringThreshold is not set
Summary: The VM exits when the condition in the subject line applies. The fix sets InitialTenuringThreshold to MaxTenuringThreshold if it is larger than MaxTenuringThreshold and InitialTenuringThreshold has not been set (is default).
Reviewed-by: jwilhelm, jmasa, brutisso, johnc

src/share/vm/runtime/arguments.cpp

@@ -3044,6 +3044,11 @@ jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_req
     set_mode_flags(_int);
   }
 
+  // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
+  if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
+    FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
+  }
+
 #ifndef COMPILER2
   // Don't degrade server performance for footprint
   if (FLAG_IS_DEFAULT(UseLargePages) &&

test/gc/arguments/TestInitialTenuringThreshold.java

+/*
+* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*/
+
+/*
+ * @test TestInitialTenuringThreshold
+ * @key gc
+ * @bug 8014765
+ * @summary Tests argument processing for initial tenuring threshold
+ * @library /testlibrary
+ * @run main/othervm TestInitialTenuringThreshold
+ * @author thomas.schatzl@oracle.com
+ */
+
+import com.oracle.java.testlibrary.*;
+
+public class TestInitialTenuringThreshold {
+
+  public static void runWithThresholds(int initial, int max, boolean shouldfail) throws Exception {
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+      "-XX:InitialTenuringThreshold=" + String.valueOf(initial),
+      "-XX:MaxTenuringThreshold=" + String.valueOf(max),
+      "-version"
+      );
+
+    OutputAnalyzer output = new OutputAnalyzer(pb.start());
+    if (shouldfail) {
+      output.shouldHaveExitValue(1);
+    } else {
+      output.shouldHaveExitValue(0);
+    }
+  }
+
+
+  public static void main(String args[]) throws Exception {
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+      // some value below the default value of InitialTenuringThreshold of 7
+      "-XX:MaxTenuringThreshold=1",
+      "-version"
+      );
+
+    OutputAnalyzer output = new OutputAnalyzer(pb.start());
+    output.shouldHaveExitValue(0);
+    // successful tests
+    runWithThresholds(0, 10, false);
+    runWithThresholds(5, 5, false);
+    // failing tests
+    runWithThresholds(10, 0, true);
+    runWithThresholds(9, 8, true);
+    runWithThresholds(-1, 8, true);
+    runWithThresholds(8, -1, true);
+    runWithThresholds(8, 16, true);
+    runWithThresholds(16, 8, true);
+  }
+}
+