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.

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     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

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     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  *

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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 TestLargePageUseForAuxMemory.java

    26  * @bug 8058354

    27  * @key gc

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

    29  * @requires (vm.gc=="G1" | vm.gc=="null")

    30  * @build TestLargePageUseForAuxMemory

    31  * @run main ClassFileInstaller sun.hotspot.WhiteBox

    32  *                              sun.hotspot.WhiteBox$WhiteBoxPermission

    33  * @summary Test that auxiliary data structures are allocated using large pages if available.

    34  * @run main/othervm -Xbootclasspath/a:. -XX:+UseG1GC -XX:+WhiteBoxAPI -XX:+IgnoreUnrecognizedVMOptions -XX:+UseLargePages TestLargePageUseForAuxMemory

    35  */

    36 

    37 import com.oracle.java.testlibrary.*;

    38 import sun.hotspot.WhiteBox;

    39 

    40 public class TestLargePageUseForAuxMemory {

    41     static final int HEAP_REGION_SIZE = 4 * 1024 * 1024;

    42     static long largePageSize;

    43     static long smallPageSize;

    44 

    45     static void checkSmallTables(OutputAnalyzer output, long expectedPageSize) throws Exception {

    46         output.shouldContain("G1 'Block offset table': pg_sz=" + expectedPageSize);

    47         output.shouldContain("G1 'Card counts table': pg_sz=" + expectedPageSize);

    48     }

    49 

    50     static void checkBitmaps(OutputAnalyzer output, long expectedPageSize) throws Exception {

    51         output.shouldContain("G1 'Prev Bitmap': pg_sz=" + expectedPageSize);

    52         output.shouldContain("G1 'Next Bitmap': pg_sz=" + expectedPageSize);

    53     }

    54 

    55     static void testVM(long heapsize, boolean cardsShouldUseLargePages, boolean bitmapShouldUseLargePages) throws Exception {

    56         ProcessBuilder pb;

    57         // Test with large page enabled.

    58         pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",

    59                                                    "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE,

    60                                                    "-Xms" + 10 * HEAP_REGION_SIZE,

    61                                                    "-Xmx" + heapsize,

    62                                                    "-XX:+TracePageSizes",

    63                                                    "-XX:+UseLargePages",

    64                                                    "-XX:+IgnoreUnrecognizedVMOptions",  // there is on ObjectAlignmentInBytes in 32 bit builds

    65                                                    "-XX:ObjectAlignmentInBytes=8",

    66                                                    "-version");

    67 

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

    69         checkSmallTables(output, (cardsShouldUseLargePages ? largePageSize : smallPageSize));

    70         checkBitmaps(output, (bitmapShouldUseLargePages ? largePageSize : smallPageSize));

    71         output.shouldHaveExitValue(0);

    72 

    73         // Test with large page disabled.

    74         pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",

    75                                                    "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE,

    76                                                    "-Xms" + 10 * HEAP_REGION_SIZE,

    77                                                    "-Xmx" + heapsize,

    78                                                    "-XX:+TracePageSizes",

    79                                                    "-XX:-UseLargePages",

    80                                                    "-XX:+IgnoreUnrecognizedVMOptions",  // there is on ObjectAlignmentInBytes in 32 bit builds

    81                                                    "-XX:ObjectAlignmentInBytes=8",

    82                                                    "-version");

    83 

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

    85         checkSmallTables(output, smallPageSize);

    86         checkBitmaps(output, smallPageSize);

    87         output.shouldHaveExitValue(0);

    88     }

    89 

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

    91         if (!Platform.isDebugBuild()) {

    92             System.out.println("Skip tests on non-debug builds because the required option TracePageSizes is a debug-only option.");

    93             return;

    94         }

    95 

    96         WhiteBox wb = WhiteBox.getWhiteBox();

    97         smallPageSize = wb.getVMPageSize();

    98         largePageSize = wb.getVMLargePageSize();

    99 

   100         if (largePageSize == 0) {

   101             System.out.println("Skip tests because large page support does not seem to be available on this platform.");

   102             return;

   103         }

   104 

   105         // To get large pages for the card table etc. we need at least a 1G heap (with 4k page size).

   106         // 32 bit systems will have problems reserving such an amount of contiguous space, so skip the

   107         // test there.

   108         if (!Platform.is32bit()) {

   109             // Size that a single card covers.

   110             final int cardSize = 512;

   111 

   112             final long heapSizeForCardTableUsingLargePages = largePageSize * cardSize;

   113 

   114             testVM(heapSizeForCardTableUsingLargePages, true, true);

   115             testVM(heapSizeForCardTableUsingLargePages + HEAP_REGION_SIZE, true, true);

   116             testVM(heapSizeForCardTableUsingLargePages - HEAP_REGION_SIZE, false, true);

   117         }

   118 

   119         // Minimum heap requirement to get large pages for bitmaps is 128M heap. This seems okay to test

   120         // everywhere.

   121         final int bitmapTranslationFactor = 8 * 8; // ObjectAlignmentInBytes * BitsPerByte

   122         final long heapSizeForBitmapUsingLargePages = largePageSize * bitmapTranslationFactor;

   123 

   124         testVM(heapSizeForBitmapUsingLargePages, false, true);

   125         testVM(heapSizeForBitmapUsingLargePages + HEAP_REGION_SIZE, false, true);

   126         testVM(heapSizeForBitmapUsingLargePages - HEAP_REGION_SIZE, false, false);

   127     }

   128 }

   129