1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   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
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  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
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  23 
  24 /*
  25  * @test
  26  * @key nmt jcmd
  27  * @summary Verify that jcmd correctly reports that NMT is not enabled
  28  * @library /testlibrary
  29  * @modules java.base/jdk.internal.misc
  30  *          java.management
  31  * @run main JcmdWithNMTDisabled 1
  32  */
  33 
  34 import jdk.test.lib.*;
  35 
  36 public class JcmdWithNMTDisabled {
  37   static ProcessBuilder pb = new ProcessBuilder();
  38   static String pid;
  39 
  40   public static void main(String args[]) throws Exception {
  41 
  42     // This test explicitly needs to be run with the exact command lines below, not passing on
  43     // arguments from the parent VM is a conscious choice to avoid NMT being turned on.
  44     if (args.length > 0) {
  45       ProcessBuilder pb;
  46       OutputAnalyzer output;
  47       String testjdkPath = System.getProperty("test.jdk");
  48 
  49       // First run without enabling NMT
  50       pb = ProcessTools.createJavaProcessBuilder("-Dtest.jdk=" + testjdkPath, "JcmdWithNMTDisabled");
  51       output = new OutputAnalyzer(pb.start());
  52       output.shouldHaveExitValue(0);
  53 
  54       // Then run with explicitly disabling NMT, should not be any difference
  55       pb = ProcessTools.createJavaProcessBuilder("-Dtest.jdk=" + testjdkPath, "-XX:NativeMemoryTracking=off", "JcmdWithNMTDisabled");
  56       output = new OutputAnalyzer(pb.start());
  57       output.shouldHaveExitValue(0);
  58 
  59       return;
  60     }
  61 
  62     // Grab my own PID
  63     pid = Long.toString(ProcessTools.getProcessId());
  64 
  65     jcmdCommand("summary");
  66     jcmdCommand("detail");
  67     jcmdCommand("baseline");
  68     jcmdCommand("summary.diff");
  69     jcmdCommand("detail.diff");
  70     jcmdCommand("scale=GB");
  71     jcmdCommand("shutdown");
  72   }
  73 
  74   // Helper method for invoking different jcmd calls, all should fail with the same message saying NMT is not enabled
  75   public static void jcmdCommand(String command) throws Exception {
  76 
  77     pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", command});
  78     OutputAnalyzer output = new OutputAnalyzer(pb.start());
  79 
  80     // Verify that jcmd reports that NMT is not enabled
  81     output.shouldContain("Native memory tracking is not enabled");
  82   }
  83 }