1 /*

     2  * Copyright (c) 2019, 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 package gc.arguments;

    25 

    26 /*

    27  * @test TestMaxRAMFlags

    28  * @key gc

    29  * @bug 8222252

    30  * @summary Verify correct MaxHeapSize and UseCompressedOops when MaxRAM and MaxRAMPercentage

    31  * are specified.

    32  * @library /test/lib

    33  * @library /

    34  * @requires vm.bits == "64"

    35  * @modules java.base/jdk.internal.misc

    36  *          java.management

    37  * @build sun.hotspot.WhiteBox

    38  * @run driver ClassFileInstaller sun.hotspot.WhiteBox

    39  *                              sun.hotspot.WhiteBox$WhiteBoxPermission

    40  * @run main gc.arguments.TestMaxRAMFlags

    41  * @author bob.vandette@oracle.com

    42  */

    43 

    44 import java.util.regex.Matcher;

    45 import java.util.regex.Pattern;

    46 

    47 import java.util.ArrayList;

    48 import java.util.Arrays;

    49 

    50 import jdk.test.lib.process.OutputAnalyzer;

    51 import jdk.test.lib.process.ProcessTools;

    52 

    53 public class TestMaxRAMFlags {

    54 

    55   private static void checkMaxRAMSize(long maxram, int maxrampercent, boolean forcecoop, long expectheap, boolean expectcoop) throws Exception {

    56 

    57     ArrayList<String> args = new ArrayList<String>();

    58     args.add("-XX:MaxRAM=" + maxram);

    59     args.add("-XX:MaxRAMPercentage=" + maxrampercent);

    60     if (forcecoop) {

    61       args.add("-XX:+UseCompressedOops");

    62     }

    63 

    64     args.add("-XX:+PrintFlagsFinal");

    65     args.add("-version");

    66 

    67     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args.toArray(new String[0]));

    68     OutputAnalyzer output = new OutputAnalyzer(pb.start());

    69     output.shouldHaveExitValue(0);

    70     String stdout = output.getStdout();

    71 

    72     long actualheap = new Long(getFlagValue("MaxHeapSize", stdout)).longValue();

    73     if (actualheap != expectheap) {

    74       throw new RuntimeException("MaxHeapSize value set to " + actualheap +

    75         ", expected " + expectheap + " when running with the following flags: " + Arrays.asList(args).toString());

    76     }

    77 

    78     boolean actualcoop = getFlagBoolValue("UseCompressedOops", stdout);

    79     if (actualcoop != expectcoop) {

    80       throw new RuntimeException("UseCompressedOops set to " + actualcoop +

    81         ", expected " + expectcoop + " when running with the following flags: " + Arrays.asList(args).toString());

    82     }

    83   }

    84 

    85   private static long getHeapBaseMinAddress() throws Exception {

    86     ArrayList<String> args = new ArrayList<String>();

    87     args.add("-XX:+PrintFlagsFinal");

    88     args.add("-version");

    89 

    90     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args.toArray(new String[0]));

    91     OutputAnalyzer output = new OutputAnalyzer(pb.start());

    92     output.shouldHaveExitValue(0);

    93     String stdout = output.getStdout();

    94     return (new Long(getFlagValue("HeapBaseMinAddress", stdout)).longValue());

    95   }

    96 

    97   private static String getFlagValue(String flag, String where) {

    98     Matcher m = Pattern.compile(flag + "\\s+:?=\\s+\\d+").matcher(where);

    99     if (!m.find()) {

   100       throw new RuntimeException("Could not find value for flag " + flag + " in output string");

   101     }

   102     String match = m.group();

   103     return match.substring(match.lastIndexOf(" ") + 1, match.length());

   104   }

   105 

   106   private static boolean getFlagBoolValue(String flag, String where) {

   107     Matcher m = Pattern.compile(flag + "\\s+:?= (true|false)").matcher(where);

   108     if (!m.find()) {

   109       throw new RuntimeException("Could not find value for flag " + flag + " in output string");

   110     }

   111     return m.group(1).equals("true");

   112   }

   113 

   114   public static void main(String args[]) throws Exception {

   115     // Tests

   116     // 1. Verify that MaxRAMPercentage overrides UseCompressedOops Ergo

   117     // 2. Verify that UseCompressedOops forces compressed oops limit even

   118     //    when other flags are specified.

   119 

   120     long oneG = 1L * 1024L * 1024L * 1024L;

   121 

   122     // Hotspot startup logic reduces MaxHeapForCompressedOops by HeapBaseMinAddress

   123     // in order to get zero based compressed oops offsets.

   124     long heapbaseminaddr = getHeapBaseMinAddress();

   125     long maxcoopheap = TestUseCompressedOopsErgoTools.getMaxHeapForCompressedOops(new String [0]) - heapbaseminaddr;

   126 

   127     // Args: MaxRAM , MaxRAMPercentage, forcecoop, expect heap, expect coop

   128     checkMaxRAMSize(maxcoopheap - oneG, 100, false, maxcoopheap - oneG, true);

   129     checkMaxRAMSize(maxcoopheap + oneG, 100, false, maxcoopheap + oneG, false);

   130     checkMaxRAMSize(maxcoopheap + oneG, 100, true, maxcoopheap, true);

   131   }

   132 }