28f71c2c72
8202286: Allocation of old generation of Java heap on alternate memory devices Enable an experimental feature in HotSpot JVM to allocate old generation of Parallel GC on an alternative memory device, such as NV-DIMMs. Reviewed-by: sangheki, sjohanss
126 lines
4.7 KiB
Java
126 lines
4.7 KiB
Java
/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test TestYoungObjectsOnDram
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* @summary Check that objects in young generation reside in dram.
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* @requires vm.gc=="null"
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* @library /test/lib
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* @build sun.hotspot.WhiteBox
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* @run driver ClassFileInstaller sun.hotspot.WhiteBox
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* @run main TestYoungObjectsOnDram -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
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* -XX:+WhiteBoxAPI
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*/
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.lib.Asserts;
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import sun.hotspot.WhiteBox;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Collections;
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/**
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* Test spawns YoungObjectTest in a separate VM and expects that it
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* completes without a RuntimeException.
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*/
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public class TestYoungObjectsOnDram {
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public static final int ALLOCATION_SIZE = 100;
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private static ArrayList<String> testOpts;
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public static void main(String args[]) throws Exception {
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testOpts = new ArrayList();
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String[] common_options = new String[] {
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"-Xbootclasspath/a:.",
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"-XX:+UnlockExperimentalVMOptions",
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"-XX:+UnlockDiagnosticVMOptions",
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"-XX:+WhiteBoxAPI",
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"-XX:AllocateOldGenAt="+System.getProperty("test.dir", "."),
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"-XX:SurvivorRatio=1", // Survivor-to-eden ratio is 1:1
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"-Xms10M", "-Xmx10M",
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"-XX:InitialTenuringThreshold=15" // avoid promotion of objects to Old Gen
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};
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String testVmOptsStr = System.getProperty("test.java.opts");
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if (!testVmOptsStr.isEmpty()) {
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String[] testVmOpts = testVmOptsStr.split(" ");
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Collections.addAll(testOpts, testVmOpts);
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}
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Collections.addAll(testOpts, common_options);
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// Test with G1 GC
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runTest("-XX:+UseG1GC");
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// Test with ParallelOld GC
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runTest("-XX:+UseParallelOldGC -XX:-UseAdaptiveGCBoundary");
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runTest("-XX:+UseParallelOldGC -XX:+UseAdaptiveGCBoundary");
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}
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private static void runTest(String... extraFlags) throws Exception {
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Collections.addAll(testOpts, extraFlags);
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testOpts.add(YoungObjectTest.class.getName());
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System.out.println(testOpts);
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ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(false,
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testOpts.toArray(new String[testOpts.size()]));
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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System.out.println(output.getStdout());
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output.shouldHaveExitValue(0);
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}
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}
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/**
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* This class tests that newly created object is in Young generation and resides in DRAM.
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* The necessary condition for this test is running in VM with the following flags:
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* -XX:AllocateOldGenAt=, -XX:InitialTenuringThreshold=15, -XX:SurvivorRatio=1
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*/
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class YoungObjectTest {
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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private static void validateYoungObject(Object o) {
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Asserts.assertTrue(!WB.isObjectInOldGen(o),
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"Object is supposed to be in YoungGen");
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long youngObj_addr = WB.getObjectAddress(o);
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long dram_heap_start = WB.dramReservedStart();
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long dram_heap_end = WB.dramReservedEnd();
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Asserts.assertTrue(youngObj_addr >= dram_heap_start && youngObj_addr <= dram_heap_end,
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"Young object does not reside in DRAM");
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}
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public static void main(String args[]) throws Exception {
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// allocate an object
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byte[] youngObj = new byte[TestYoungObjectsOnDram.ALLOCATION_SIZE];
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validateYoungObject(youngObj);
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// Start a Young GC and check that object is still in DRAM.
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// We have used -XX:InitialTenuringThreshold=15 to invoke this test
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WB.youngGC();
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validateYoungObject(youngObj);
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}
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}
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