--- /dev/null 2018-11-19 14:11:42.000000000 -0800 +++ new/test/hotspot/jtreg/gc/8202286/TestYoungObjectsOnDram.java 2018-11-19 14:11:39.577205300 -0800 @@ -0,0 +1,123 @@ +/* + * Copyright (c) 2018 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 TestYoungObjectsOnDram + * @summary Check that objects in young generation reside in dram. + * @library /test/lib + * @build sun.hotspot.WhiteBox + * @run driver ClassFileInstaller sun.hotspot.WhiteBox + * @run main TestYoungObjectsOnDram -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions + * -XX:+WhiteBoxAPI + */ + +import jdk.test.lib.process.OutputAnalyzer; +import jdk.test.lib.process.ProcessTools; +import jdk.test.lib.Asserts; +import sun.hotspot.WhiteBox; + +import java.util.ArrayList; +import java.util.List; +import java.util.Collections; + +/** + * Test spawns YoungObjectTest in a separate VM and expects that it + * completes without a RuntimeException. + */ +public class TestYoungObjectsOnDram { + + public static final int ALLOCATION_SIZE = 100; + private static ArrayList testOpts; + + public static void main(String args[]) throws Exception { + testOpts = new ArrayList(); + + String[] common_options = new String[] { + "-Xbootclasspath/a:.", + "-XX:+UnlockExperimentalVMOptions", + "-XX:+UnlockDiagnosticVMOptions", + "-XX:+WhiteBoxAPI", + "-XX:AllocateOldGenAt="+System.getProperty("test.dir", "."), + "-XX:SurvivorRatio=1", // Survivor-to-eden ratio is 1:1 + "-Xms10M", "-Xmx10M", + "-XX:InitialTenuringThreshold=15" // avoid promotion of objects to Old Gen + }; + + String testVmOptsStr = System.getProperty("test.java.opts"); + if (!testVmOptsStr.isEmpty()) { + String[] testVmOpts = testVmOptsStr.split(" "); + Collections.addAll(testOpts, testVmOpts); + } + Collections.addAll(testOpts, common_options); + + // Test with G1 GC + runTest("-XX:+UseG1GC"); + // Test with ParallelOld GC + //runTest("-XX:+UseParallelOldGC"); + } + + private static void runTest(String... extraFlags) throws Exception { + Collections.addAll(testOpts, extraFlags); + testOpts.add(YoungObjectTest.class.getName()); + System.out.println(testOpts); + + ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(false, + testOpts.toArray(new String[testOpts.size()])); + + OutputAnalyzer output = new OutputAnalyzer(pb.start()); + System.out.println(output.getStdout()); + output.shouldHaveExitValue(0); + } +} + +/** + * This class tests that newly created object is in Young generation and resides in DRAM. + * The necessary condition for this test is running in VM with the following flags: + * -XX:AllocateOldGenAt=, -XX:InitialTenuringThreshold=15, -XX:SurvivorRatio=1 + */ +class YoungObjectTest { + private static final WhiteBox WB = WhiteBox.getWhiteBox(); + + private static void validateYoungObject(Object o) { + Asserts.assertTrue(!WB.isObjectInOldGen(o), + "Object is supposed to be in YoungGen"); + + long youngObj_addr = WB.getObjectAddress(o); + long dram_heap_start = WB.g1DramReservedStart(); + long dram_heap_end = WB.g1DramReservedEnd(); + + Asserts.assertTrue(youngObj_addr >= dram_heap_start && youngObj_addr <= dram_heap_end, + "Young object does not reside in DRAM"); + } + + public static void main(String args[]) throws Exception { + // allocate an object + byte[] youngObj = new byte[TestYoungObjectsOnDram.ALLOCATION_SIZE]; + validateYoungObject(youngObj); + + // Start a Young GC and check that object is still in DRAM. + // We have used -XX:InitialTenuringThreshold=15 to invoke this test + WB.youngGC(); + validateYoungObject(youngObj); + } +}