1 /*
   2  * Copyright (c) 2018 Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test TestOldObjectsOnNvdimm
  26  * @summary Check that objects in old generation reside in dram.
  27  * @library /test/lib
  28  * @build sun.hotspot.WhiteBox
  29  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  30  * @run main TestOldObjectsOnNvdimm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions 
  31  *                                  -XX:+WhiteBoxAPI
  32  */
  33 
  34 import jdk.test.lib.process.OutputAnalyzer;
  35 import jdk.test.lib.process.ProcessTools;
  36 import jdk.test.lib.Asserts;
  37 import sun.hotspot.WhiteBox;
  38 
  39 import java.util.ArrayList;
  40 import java.util.List;
  41 import java.util.Collections;
  42 
  43 /*
  44  * Test spawns OldObjectTest in a separate VM and expects that it
  45  * completes without a RuntimeException.
  46  */
  47 public class TestOldObjectsOnNvdimm {
  48 
  49     public static final int ALLOCATION_SIZE = 100;
  50     private static ArrayList<String> testOpts;
  51 
  52     public static void main(String args[]) throws Exception {
  53         testOpts = new ArrayList();
  54 
  55         String[] common_options = new String[] {
  56             "-Xbootclasspath/a:.",
  57             "-XX:+UnlockExperimentalVMOptions",
  58             "-XX:+UnlockDiagnosticVMOptions",
  59             "-XX:+WhiteBoxAPI",
  60             "-XX:AllocateOldGenAt="+System.getProperty("test.dir", "."),
  61             "-Xms10M", "-Xmx10M",
  62             "-XX:MaxTenuringThreshold=1" // Promote objects to Old Gen 
  63         };
  64 
  65         String testVmOptsStr = System.getProperty("test.java.opts");
  66         if (!testVmOptsStr.isEmpty()) {
  67             String[] testVmOpts = testVmOptsStr.split(" ");
  68             Collections.addAll(testOpts, testVmOpts);
  69         }
  70         Collections.addAll(testOpts, common_options);
  71     
  72         // Test with G1 GC
  73         runTest("-XX:+UseG1GC");
  74         // Test with ParallelOld GC
  75         // runTest("-XX:+UseParallelOldGC");
  76     }
  77 
  78     private static void runTest(String... extraFlags) throws Exception {
  79         Collections.addAll(testOpts, extraFlags);
  80         testOpts.add(OldObjectTest.class.getName());
  81         System.out.println(testOpts);
  82 
  83         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(false,
  84                 testOpts.toArray(new String[testOpts.size()]));
  85 
  86         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  87         System.out.println(output.getStdout());
  88         output.shouldHaveExitValue(0);
  89     }
  90 }
  91 
  92 /*
  93  * This class tests that object is in Old generation after tenuring and resides in NVDIMM.
  94  * The necessary condition for this test is running in VM with the following flags: 
  95  * -XX:AllocateOldGenAt=, -XX:MaxTenuringThreshold=1
  96  */
  97 class OldObjectTest {
  98     private static final WhiteBox WB = WhiteBox.getWhiteBox();
  99 
 100     private static void validateOldObject(Object o) {
 101         Asserts.assertTrue(WB.isObjectInOldGen(o),
 102                 "Object is supposed to be in OldGen");
 103 
 104         long oldObj_addr = WB.getObjectAddress(o);
 105         long nvdimm_heap_start = WB.g1NvdimmReservedStart();
 106         long nvdimm_heap_end = WB.g1NvdimmReservedEnd();
 107         
 108         Asserts.assertTrue(oldObj_addr >= nvdimm_heap_start && oldObj_addr <= nvdimm_heap_end,
 109                 "Old object does not reside in NVDIMM");
 110     }
 111 
 112     public static void main(String args[]) throws Exception {
 113         // allocate an object and perform Young GCs to promote it to Old
 114         byte[] oldObj = new byte[TestOldObjectsOnNvdimm.ALLOCATION_SIZE];
 115         WB.youngGC();
 116         WB.youngGC();
 117         validateOldObject(oldObj);
 118     }
 119 }