--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/gc/TestSmallHeap.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2014, 2016, 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 TestSmallHeap
+ * @bug 8067438 8152239
+ * @requires vm.gc=="null"
+ * @summary Verify that starting the VM with a small heap works
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * @build sun.hotspot.WhiteBox
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI TestSmallHeap
+ */
+
+/* Note: It would be nice to verify the minimal supported heap size here,
+ * but we align the heap size based on the card table size. And the card table
+ * size is aligned based on the minimal pages size provided by the os. This
+ * means that on most platforms, where the minimal page size is 4k, we get a
+ * minimal heap size of 2m but on Solaris/Sparc we have a page size of 8k and
+ * get a minimal heap size of 4m. And on platforms where the page size is 64k
+ * we get a minimal heap size of 32m. We never use large pages for the card table.
+ *
+ * There is also no check in the VM for verifying that the maximum heap size
+ * is larger than the supported minimal heap size.
+ *
+ * To work around these behaviors this test uses -Xmx4m but then
+ * calculates what the expected heap size should be. The calculation is a
+ * simplified version of the code in the VM. We assume that the card table will
+ * use one page. Each byte in the card table corresponds to 512 bytes on the heap.
+ * So, the expected heap size is page_size * 512.
+ *
+ * There is no formal requirement for the minimal value of the maximum heap size
+ * the VM should support. In most cases the VM could start with -Xmx2m.
+ * But with 2m limit GC could be triggered before VM initialization completed.
+ * Therefore we start the VM with 4M heap.
+ */
+
+import jdk.test.lib.Asserts;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+
+import java.util.LinkedList;
+
+import sun.hotspot.WhiteBox;
+
+public class TestSmallHeap {
+
+    public static void main(String[] args) throws Exception {
+        // Do all work in the VM driving the test, the VM
+        // with the small heap size should do as little as
+        // possible to avoid hitting an OOME.
+        WhiteBox wb = WhiteBox.getWhiteBox();
+        int pageSize = wb.getVMPageSize();
+        int heapBytesPerCard = 512;
+        long expectedMaxHeap = pageSize * heapBytesPerCard;
+
+        verifySmallHeapSize("-XX:+UseParallelGC", expectedMaxHeap);
+        verifySmallHeapSize("-XX:+UseSerialGC", expectedMaxHeap);
+        verifySmallHeapSize("-XX:+UseG1GC", expectedMaxHeap);
+        verifySmallHeapSize("-XX:+UseConcMarkSweepGC", expectedMaxHeap);
+    }
+
+    private static void verifySmallHeapSize(String gc, long expectedMaxHeap) throws Exception {
+        long minMaxHeap = 4 * 1024 * 1024;
+        LinkedList<String> vmOptions = new LinkedList<>();
+        vmOptions.add(gc);
+        vmOptions.add("-Xmx" + minMaxHeap);
+        vmOptions.add("-XX:+PrintFlagsFinal");
+        vmOptions.add(VerifyHeapSize.class.getName());
+
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(vmOptions.toArray(new String[0]));
+        OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
+        analyzer.shouldHaveExitValue(0);
+
+        expectedMaxHeap = Math.max(expectedMaxHeap, minMaxHeap);
+        long maxHeapSize = Long.parseLong(analyzer.firstMatch("MaxHeapSize.+=\\s+(\\d+)",1));
+        long actualHeapSize = Long.parseLong(analyzer.firstMatch(VerifyHeapSize.actualMsg + "(\\d+)",1));
+        Asserts.assertEQ(maxHeapSize, expectedMaxHeap);
+        Asserts.assertLessThanOrEqual(actualHeapSize, maxHeapSize);
+    }
+}
+
+class VerifyHeapSize {
+    public static final String actualMsg = "Actual heap size: ";
+
+    public static void main(String args[]) {
+        // Avoid string concatenation
+        System.out.print(actualMsg);
+        System.out.println(Runtime.getRuntime().maxMemory());
+    }
+}