/* * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @test TestLargePageUseForAuxMemory.java * @summary Test that auxiliary data structures are allocated using large pages if available. * @bug 8058354 8079208 * @key gc * @library /testlibrary /test/lib * @requires (vm.gc=="G1" | vm.gc=="null") * @build jdk.test.lib.* sun.hotspot.WhiteBox * @build TestLargePageUseForAuxMemory * @run main ClassFileInstaller sun.hotspot.WhiteBox * sun.hotspot.WhiteBox$WhiteBoxPermission * @run main/othervm -Xbootclasspath/a:. -XX:+UseG1GC -XX:+WhiteBoxAPI -XX:+IgnoreUnrecognizedVMOptions -XX:+UseLargePages TestLargePageUseForAuxMemory */ import java.lang.Math; import jdk.test.lib.*; import jdk.test.lib.Asserts; import sun.hotspot.WhiteBox; public class TestLargePageUseForAuxMemory { static final long HEAP_REGION_SIZE = 1 * 1024 * 1024; static long largePageSize; static long smallPageSize; static long allocGranularity; static void checkSmallTables(OutputAnalyzer output, long expectedPageSize) throws Exception { output.shouldContain("G1 'Block offset table': pg_sz=" + expectedPageSize); output.shouldContain("G1 'Card counts table': pg_sz=" + expectedPageSize); } static void checkBitmaps(OutputAnalyzer output, long expectedPageSize) throws Exception { output.shouldContain("G1 'Prev Bitmap': pg_sz=" + expectedPageSize); output.shouldContain("G1 'Next Bitmap': pg_sz=" + expectedPageSize); } static void testVM(String what, long heapsize, boolean cardsShouldUseLargePages, boolean bitmapShouldUseLargePages) throws Exception { System.out.println(what + " heapsize " + heapsize + " card table should use large pages " + cardsShouldUseLargePages + " " + "bitmaps should use large pages " + bitmapShouldUseLargePages); ProcessBuilder pb; // Test with large page enabled. pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE, "-Xms" + heapsize, "-Xmx" + heapsize, "-XX:+TracePageSizes", "-XX:+UseLargePages", "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds "-XX:ObjectAlignmentInBytes=8", "-version"); OutputAnalyzer output = new OutputAnalyzer(pb.start()); checkSmallTables(output, (cardsShouldUseLargePages ? largePageSize : smallPageSize)); checkBitmaps(output, (bitmapShouldUseLargePages ? largePageSize : smallPageSize)); output.shouldHaveExitValue(0); // Test with large page disabled. pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE, "-Xms" + heapsize, "-Xmx" + heapsize, "-XX:+TracePageSizes", "-XX:-UseLargePages", "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds "-XX:ObjectAlignmentInBytes=8", "-version"); output = new OutputAnalyzer(pb.start()); checkSmallTables(output, smallPageSize); checkBitmaps(output, smallPageSize); output.shouldHaveExitValue(0); } private static long gcd(long x, long y) { while (x > 0) { long t = x; x = y % x; y = t; } return y; } private static long lcm(long x, long y) { return x * (y / gcd(x, y)); } public static void main(String[] args) throws Exception { if (!Platform.isDebugBuild()) { System.out.println("Skip tests on non-debug builds because the required option TracePageSizes is a debug-only option."); return; } // Size that a single card covers. final int cardSize = 512; WhiteBox wb = WhiteBox.getWhiteBox(); smallPageSize = wb.getVMPageSize(); largePageSize = wb.getVMLargePageSize(); allocGranularity = wb.getVMAllocationGranularity(); final long heapAlignment = lcm(cardSize * smallPageSize, largePageSize); if (largePageSize == 0) { System.out.println("Skip tests because large page support does not seem to be available on this platform."); return; } if (largePageSize == smallPageSize) { System.out.println("Skip tests because large page support does not seem to be available on this platform." + "Small and large page size are the same."); return; } // To get large pages for the card table etc. we need at least a 1G heap (with 4k page size). // 32 bit systems will have problems reserving such an amount of contiguous space, so skip the // test there. if (!Platform.is32bit()) { final long heapSizeForCardTableUsingLargePages = largePageSize * cardSize; final long heapSizeDiffForCardTable = Math.max(Math.max(allocGranularity * cardSize, HEAP_REGION_SIZE), largePageSize); Asserts.assertGT(heapSizeForCardTableUsingLargePages, heapSizeDiffForCardTable, "To test we would require to use an invalid heap size"); testVM("case1: card table and bitmap use large pages (barely)", heapSizeForCardTableUsingLargePages, true, true); testVM("case2: card table and bitmap use large pages (extra slack)", heapSizeForCardTableUsingLargePages + heapSizeDiffForCardTable, true, true); testVM("case3: only bitmap uses large pages (barely not)", heapSizeForCardTableUsingLargePages - heapSizeDiffForCardTable, false, true); } // Minimum heap requirement to get large pages for bitmaps is 128M heap. This seems okay to test // everywhere. final int bitmapTranslationFactor = 8 * 8; // ObjectAlignmentInBytes * BitsPerByte final long heapSizeForBitmapUsingLargePages = largePageSize * bitmapTranslationFactor; final long heapSizeDiffForBitmap = Math.max(Math.max(allocGranularity * bitmapTranslationFactor, HEAP_REGION_SIZE), Math.max(largePageSize, heapAlignment)); Asserts.assertGT(heapSizeForBitmapUsingLargePages, heapSizeDiffForBitmap, "To test we would require to use an invalid heap size"); testVM("case4: only bitmap uses large pages (barely)", heapSizeForBitmapUsingLargePages, false, true); testVM("case5: only bitmap uses large pages (extra slack)", heapSizeForBitmapUsingLargePages + heapSizeDiffForBitmap, false, true); testVM("case6: nothing uses large pages (barely not)", heapSizeForBitmapUsingLargePages - heapSizeDiffForBitmap, false, false); } }