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
122 lines
4.4 KiB
Java
122 lines
4.4 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 TestOldObjectsOnNvdimm
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* @summary Check that objects in old 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 TestOldObjectsOnNvdimm -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 OldObjectTest 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 TestOldObjectsOnNvdimm {
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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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"-Xms10M", "-Xmx10M",
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"-XX:MaxTenuringThreshold=1" // Promote 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(OldObjectTest.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 object is in Old generation after tenuring and resides in NVDIMM.
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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:MaxTenuringThreshold=1
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*/
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class OldObjectTest {
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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private static void validateOldObject(Object o) {
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Asserts.assertTrue(WB.isObjectInOldGen(o),
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"Object is supposed to be in OldGen");
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long oldObj_addr = WB.getObjectAddress(o);
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long nvdimm_heap_start = WB.nvdimmReservedStart();
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long nvdimm_heap_end = WB.nvdimmReservedEnd();
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Asserts.assertTrue(oldObj_addr >= nvdimm_heap_start && oldObj_addr <= nvdimm_heap_end,
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"Old object does not reside in NVDIMM");
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}
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public static void main(String args[]) throws Exception {
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// allocate an object and perform Young GCs to promote it to Old
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byte[] oldObj = new byte[TestOldObjectsOnNvdimm.ALLOCATION_SIZE];
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WB.youngGC();
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WB.youngGC();
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validateOldObject(oldObj);
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}
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}
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