Mercurial > hg > graal-jvmci-8
view test/gc/g1/TestEagerReclaimHumongousRegionsWithRefs.java @ 23606:324d912186ce
Merge
author | asaha |
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date | Mon, 21 Dec 2015 10:54:40 -0800 |
parents | cbc7c4c9e11c |
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/* * Copyright (c) 2014, 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 TestEagerReclaimHumongousRegionsWithRefs * @bug 8048179 * @summary Test to make sure that eager reclaim of humongous objects that have previously * been referenced by other old gen regions work. We simply try to fill * up the heap with humongous objects and create a remembered set entry from an object by * referencing that we know is in the old gen. After changing this reference, the object * should still be eagerly reclaimable to avoid Full GC. * @key gc * @library /testlibrary */ import java.util.regex.Pattern; import java.util.regex.Matcher; import java.util.LinkedList; import com.oracle.java.testlibrary.OutputAnalyzer; import com.oracle.java.testlibrary.ProcessTools; import static com.oracle.java.testlibrary.Asserts.*; class RefHolder { Object ref; } class ReclaimRegionFast { public static final int M = 1024*1024; public static LinkedList<Object> garbageList = new LinkedList<Object>(); public static void genGarbage() { for (int i = 0; i < 32*1024; i++) { garbageList.add(new int[100]); } garbageList.clear(); } // A large object referenced by a static. static int[] filler = new int[10 * M]; // Old gen object referencing the large object, generating remembered // set entries. static RefHolder fromOld = new RefHolder(); public static void main(String[] args) { int[] large = new int[M]; Object ref_from_stack = large; for (int i = 0; i < 100; i++) { // A large object that will be reclaimed eagerly. large = new int[6*M]; fromOld.ref = large; genGarbage(); } // Keep the reference to the first object alive. System.out.println(ref_from_stack); } } public class TestEagerReclaimHumongousRegionsWithRefs { public static void main(String[] args) throws Exception { ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( "-XX:+UseG1GC", "-Xms128M", "-Xmx128M", "-Xmn16M", "-XX:+PrintGC", ReclaimRegionFast.class.getName()); Pattern p = Pattern.compile("Full GC"); OutputAnalyzer output = new OutputAnalyzer(pb.start()); int found = 0; Matcher m = p.matcher(output.getStdout()); while (m.find()) { found++; } System.out.println("Issued " + found + " Full GCs"); assertLessThan(found, 10, "Found that " + found + " Full GCs were issued. This is larger than the bound. Eager reclaim of objects once referenced from old gen seems to not work at all"); output.shouldHaveExitValue(0); } }