--- /dev/null	2013-04-16 09:14:15.018414535 +0200
+++ new/test/gc/g1/TestSummarizeRSetStats.java	2013-05-13 23:10:34.998239950 +0200
@@ -0,0 +1,162 @@
+/*
+ * 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 TestSummarizeRSetStats.java
+ * @bug 8013895
+ * @summary Verify output of -XX:+G1SummarizeRSetStats
+ * @run main
+ *
+ * Test the output of G1SummarizeRSetStats in conjunction with G1SummarizeRSetStatsPeriod.
+ */
+
+import com.oracle.java.testlibrary.*;
+import java.lang.Thread;
+import java.util.ArrayList;
+import java.util.Arrays;
+
+class RunSystemGCs {
+    // 4M size, both are directly allocated into the old gen
+    static Object[] largeObject1 = new Object[1024 * 1024];
+    static Object[] largeObject2 = new Object[1024 * 1024];
+
+    static int[] temp;
+
+    public static void main(String[] args) {
+        // create some cross-references between these objects
+        for (int i = 0; i < largeObject1.length; i++) {
+            largeObject1[i] = largeObject2;
+        }
+
+        for (int i = 0; i < largeObject2.length; i++) {
+            largeObject2[i] = largeObject1;
+        }
+
+        int numGCs = Integer.parseInt(args[0]);
+
+        if (numGCs > 0) {
+            // try to force a minor collection: the young gen is 4M, the
+            // amount of data allocated below is roughly that (4*1024*1024 +
+            // some header data)
+            for (int i = 0; i < 1024 ; i++) {
+                temp = new int[1024];
+            }
+        }
+
+        for (int i = 0; i < numGCs - 1; i++) {
+            System.gc();
+        }
+    }
+}
+
+public class TestSummarizeRSetStats {
+
+    public static String runTest(String[] additionalArgs, int numGCs) throws Exception {
+        ArrayList<String> finalargs = new ArrayList<String>();
+        String[] defaultArgs = new String[] {
+            "-XX:+UseG1GC",
+            "-Xmn4m",
+            "-Xmx20m",
+            "-XX:InitiatingHeapOccupancyPercent=100", // we don't want the additional GCs due to initial marking
+            "-XX:+PrintGC",
+            "-XX:+UnlockDiagnosticVMOptions",
+            "-XX:G1HeapRegionSize=1M",
+        };
+
+        finalargs.addAll(Arrays.asList(defaultArgs));
+
+        if (additionalArgs != null) {
+            finalargs.addAll(Arrays.asList(additionalArgs));
+        }
+
+        finalargs.add(RunSystemGCs.class.getName());
+        finalargs.add(String.valueOf(numGCs));
+
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+            finalargs.toArray(new String[0]));
+        OutputAnalyzer output = new OutputAnalyzer(pb.start());
+
+        output.shouldHaveExitValue(0);
+
+        String result = output.getStdout();
+        return result;
+    }
+
+    private static void expectStatistics(String result, int expectedCumulative, int expectedPeriodic) throws Exception {
+        int actualTotal = result.split("Concurrent RS processed").length - 1;
+        int actualCumulative = result.split("Cumulative RS summary").length - 1;
+
+        if (expectedCumulative != actualCumulative) {
+            throw new Exception("Incorrect amount of RSet summaries at the end. Expected " + expectedCumulative + ", got " + actualCumulative);
+        }
+
+        if (expectedPeriodic != (actualTotal - actualCumulative)) {
+            throw new Exception("Incorrect amount of per-period RSet summaries at the end. Expected " + expectedPeriodic + ", got " + (actualTotal - actualCumulative));
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        String result;
+
+        // no RSet statistics output
+        result = runTest(null, 0);
+        expectStatistics(result, 0, 0);
+
+        // no RSet statistics output
+        result = runTest(null, 2);
+        expectStatistics(result, 0, 0);
+
+        // no RSet statistics output
+        result = runTest(new String[] { "-XX:G1SummarizeRSetStatsPeriod=1" }, 3);
+        expectStatistics(result, 0, 0);
+
+        // single RSet statistics output at the end
+        result = runTest(new String[] { "-XX:+G1SummarizeRSetStats" }, 0);
+        expectStatistics(result, 1, 0);
+
+        // single RSet statistics output at the end
+        result = runTest(new String[] { "-XX:+G1SummarizeRSetStats" }, 2);
+        expectStatistics(result, 1, 0);
+
+        // single RSet statistics output
+        result = runTest(new String[] { "-XX:+G1SummarizeRSetStats", "-XX:G1SummarizeRSetStatsPeriod=1" }, 0);
+        expectStatistics(result, 1, 0);
+
+        // two times RSet statistics output
+        result = runTest(new String[] { "-XX:+G1SummarizeRSetStats", "-XX:G1SummarizeRSetStatsPeriod=1" }, 1);
+        expectStatistics(result, 1, 1);
+
+        // four times RSet statistics output
+        result = runTest(new String[] { "-XX:+G1SummarizeRSetStats", "-XX:G1SummarizeRSetStatsPeriod=1" }, 3);
+        expectStatistics(result, 1, 3);
+
+        // three times RSet statistics output
+        result = runTest(new String[] { "-XX:+G1SummarizeRSetStats", "-XX:G1SummarizeRSetStatsPeriod=2" }, 3);
+        expectStatistics(result, 1, 2);
+
+        // single RSet statistics output
+        result = runTest(new String[] { "-XX:+G1SummarizeRSetStats", "-XX:G1SummarizeRSetStatsPeriod=100" }, 3);
+        expectStatistics(result, 1, 1);
+    }
+}
+