1 /*
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  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).
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  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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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