1 /*

     2  * Copyright (c) 2015, 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

    26  * @summary Test commits of overlapping regions of memory.

    27  * @key nmt jcmd

    28  * @library /testlibrary /../../test/lib

    29  * @modules java.base/sun.misc

    30  *          java.management

    31  * @build   CommitOverlappingRegions

    32  * @run main ClassFileInstaller sun.hotspot.WhiteBox

    33  *                              sun.hotspot.WhiteBox$WhiteBoxPermission

    34  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail CommitOverlappingRegions

    35  */

    36 

    37 import jdk.test.lib.*;

    38 import sun.hotspot.WhiteBox;

    39 

    40 public class CommitOverlappingRegions {

    41     public static WhiteBox wb = WhiteBox.getWhiteBox();

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

    43         OutputAnalyzer output;

    44         long size = 32 * 1024;

    45         long addr;

    46 

    47         String pid = Integer.toString(ProcessTools.getProcessId());

    48         ProcessBuilder pb = new ProcessBuilder();

    49 

    50         addr = wb.NMTReserveMemory(8*size);        // [                ]

    51         pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "detail"});

    52         // Test output before commits

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

    54         output.shouldContain("(reserved=256KB, committed=0KB)");

    55 

    56         // Commit regions 1 and 2, then test output.

    57         wb.NMTCommitMemory(addr + 0*size, 3*size); // [       ]

    58         wb.NMTCommitMemory(addr + 4*size, 3*size); //           [      ]

    59 

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

    61         output.shouldContain("(reserved=256KB, committed=192KB)");

    62 

    63         // Commit the final region which overlaps partially with both regions.

    64         wb.NMTCommitMemory(addr + 2*size, 3*size); //     [        ]

    65 

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

    67         output.getOutput();

    68         output.shouldContain("(reserved=256KB, committed=224KB)");

    69     }

    70 }