--- /dev/null	2013-03-06 12:38:34.589973472 +0100
+++ new/test/gc/8006088/TestMaxHeapSizeTools.java	2013-03-18 10:49:09.873736074 +0100
@@ -0,0 +1,94 @@
+/*
+* 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.
+*/
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import com.oracle.java.testlibrary.OutputAnalyzer;
+import com.oracle.java.testlibrary.ProcessTools;
+
+class TestMaxHeapSizeTools {
+
+  public static void checkInvalidInitialMaxHeapCombination(String gcflag) throws Exception {
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(gcflag, "-XX:MaxHeapSize=4M", "-XX:InitialHeapSize=8M", "-version");
+    OutputAnalyzer output = new OutputAnalyzer(pb.start());
+    output.shouldNotContain("Warning");
+    output.shouldContain("Error");
+    output.shouldHaveExitValue(1);
+  }
+
+  public static void checkEqualInitialMaxHeap(String gcflag) throws Exception {
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(gcflag, "-XX:MaxHeapSize=4M", "-XX:InitialHeapSize=4M", "-version");
+    OutputAnalyzer output = new OutputAnalyzer(pb.start());
+    output.shouldNotContain("Warning");
+    output.shouldNotContain("Error");
+    output.shouldHaveExitValue(0);
+  }
+
+  public static void checkValidInitialMaxHeap(String gcflag) throws Exception {
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(gcflag, "-XX:MaxHeapSize=8M", "-XX:InitialHeapSize=4M", "-version");
+    OutputAnalyzer output = new OutputAnalyzer(pb.start());
+    output.shouldNotContain("Warning");
+    output.shouldNotContain("Error");
+    output.shouldHaveExitValue(0);
+  }
+
+  /**
+   * Verify whether the VM respects the given maximum heap size in MB for the
+   * GC specified.
+   * @param gcflag The garbage collector to test as command line flag. E.g. -XX:+UseG1GC
+   * @param maxHeapSize the maximum heap size to verify, in MB.
+   */
+  public static void checkGenMaxHeapSize(String gcflag, int maxHeapsize) throws Exception {
+    final int K = 1024;
+    // the alignment for the heap. This is card size * page size, i.e. 2^9 * 2^12 = 2M.
+    // Unfortunately there is no way to retrieve this from the VM directly.
+    // It is the same for all GCs that use a card table in Hotspot (i.e. all).
+    final long alignment = 2 * K;
+
+    long expectedHeapSize = (maxHeapsize * K + alignment - 1) & ~(alignment - 1);
+
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(gcflag,
+      "-XX:MaxHeapSize=" + expectedHeapSize + "K", "-XX:+PrintFlagsFinal", "-version");
+    OutputAnalyzer output = new OutputAnalyzer(pb.start());
+    output.shouldHaveExitValue(0);
+
+    long actualHeapSize = getFlagValue("MaxHeapSize", output.getStdout()) / K;
+
+    if (actualHeapSize > expectedHeapSize) {
+      throw new RuntimeException("Heap has " + actualHeapSize  +
+        "K , expected to less than " + expectedHeapSize + "K");
+    }
+  }
+
+  private static long getFlagValue(String flag, String where) {
+    Matcher m = Pattern.compile(flag + "\\s+:=\\s+\\d+").matcher(where);
+    if (!m.find()) {
+      throw new RuntimeException("Could not find value in output string");
+    }
+    String match = m.group();
+    return Long.parseLong(match.substring(match.lastIndexOf(" ") + 1, match.length()));
+  }
+
+}
+