138 lines
5.0 KiB
Java
138 lines
5.0 KiB
Java
/*
|
|
* Copyright (c) 2014, 2023, 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.
|
|
*/
|
|
|
|
package gc.g1;
|
|
|
|
/*
|
|
* @test TestEagerReclaimHumongousRegionsClearMarkBits
|
|
* @bug 8051973
|
|
* @summary Test to make sure that eager reclaim of humongous objects correctly clears
|
|
* mark bitmaps at reclaim.
|
|
* @key randomness
|
|
* @requires vm.gc.G1
|
|
* @requires vm.debug
|
|
* @library /test/lib
|
|
* @modules java.base/jdk.internal.misc
|
|
* java.management
|
|
* @run driver gc.g1.TestEagerReclaimHumongousRegionsClearMarkBits
|
|
*/
|
|
|
|
import java.util.ArrayList;
|
|
import java.util.LinkedList;
|
|
import java.util.Random;
|
|
|
|
import jdk.test.lib.process.OutputAnalyzer;
|
|
import jdk.test.lib.process.ProcessTools;
|
|
import jdk.test.lib.Utils;
|
|
|
|
// An object that has a few references to other instances to slow down marking.
|
|
class ObjectWithSomeRefs {
|
|
public ObjectWithSomeRefs other1;
|
|
public ObjectWithSomeRefs other2;
|
|
public ObjectWithSomeRefs other3;
|
|
public ObjectWithSomeRefs other4;
|
|
}
|
|
|
|
class TestEagerReclaimHumongousRegionsClearMarkBitsReclaimRegionFast {
|
|
public static final long MAX_NANOS_FOR_RUN = 50L * 1_000_000_000L; // The maximum runtime for the actual test.
|
|
|
|
public static final int M = 1024*1024;
|
|
|
|
public static LinkedList<Object> garbageList = new LinkedList<Object>();
|
|
|
|
public static void genGarbage(Object large) {
|
|
for (int i = 0; i < 64*1024; i++) {
|
|
Object[] garbage = new Object[50];
|
|
garbage[0] = large;
|
|
garbageList.add(garbage);
|
|
}
|
|
garbageList.clear();
|
|
}
|
|
|
|
public static ArrayList<ObjectWithSomeRefs> longList = new ArrayList<ObjectWithSomeRefs>();
|
|
|
|
public static void main(String[] args) {
|
|
|
|
for (int i = 0; i < 16*1024; i++) {
|
|
longList.add(new ObjectWithSomeRefs());
|
|
}
|
|
|
|
Random rnd = Utils.getRandomInstance();
|
|
for (int i = 0; i < longList.size(); i++) {
|
|
int len = longList.size();
|
|
longList.get(i).other1 = longList.get(rnd.nextInt(len));
|
|
longList.get(i).other2 = longList.get(rnd.nextInt(len));
|
|
longList.get(i).other3 = longList.get(rnd.nextInt(len));
|
|
longList.get(i).other4 = longList.get(rnd.nextInt(len));
|
|
}
|
|
|
|
int[] large1 = new int[M];
|
|
int[] large2 = null;
|
|
int[] large3 = null;
|
|
int[] large4 = null;
|
|
|
|
Object ref_from_stack = large1;
|
|
|
|
long start_nanos = System.nanoTime();
|
|
|
|
for (int i = 0; i < 20; i++) {
|
|
long current_nanos = System.nanoTime();
|
|
if ((current_nanos - start_nanos) > MAX_NANOS_FOR_RUN) {
|
|
System.out.println("Finishing test because maximum runtime exceeded");
|
|
break;
|
|
}
|
|
// A set of large objects that will be reclaimed eagerly - and hopefully marked.
|
|
large1 = new int[M - 20];
|
|
large2 = new int[M - 20];
|
|
large3 = new int[M - 20];
|
|
large4 = new int[M - 20];
|
|
genGarbage(large1);
|
|
// Make sure that the compiler cannot completely remove
|
|
// the allocation of the large object until here.
|
|
System.out.println(large1 + " " + large2 + " " + large3 + " " + large4);
|
|
}
|
|
|
|
// Keep the reference to the first object alive.
|
|
System.out.println(ref_from_stack);
|
|
}
|
|
}
|
|
|
|
public class TestEagerReclaimHumongousRegionsClearMarkBits {
|
|
public static void main(String[] args) throws Exception {
|
|
OutputAnalyzer output = ProcessTools.executeLimitedTestJava(
|
|
"-XX:+UseG1GC",
|
|
"-Xms128M",
|
|
"-Xmx128M",
|
|
"-Xmn2M",
|
|
"-XX:G1HeapRegionSize=1M",
|
|
"-XX:InitiatingHeapOccupancyPercent=0", // Want to have as much as possible mark cycles.
|
|
"-Xlog:gc",
|
|
"-XX:+UnlockDiagnosticVMOptions",
|
|
"-XX:+VerifyAfterGC",
|
|
"-XX:ConcGCThreads=1", // Want to make marking as slow as possible.
|
|
"-XX:+G1VerifyBitmaps",
|
|
TestEagerReclaimHumongousRegionsClearMarkBitsReclaimRegionFast.class.getName());
|
|
output.shouldHaveExitValue(0);
|
|
}
|
|
}
|