83 lines
2.7 KiB
Java
83 lines
2.7 KiB
Java
/*
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* Copyright (c) 2020, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc.z;
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/*
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* @test TestPageCacheFlush
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* @requires vm.gc.Z
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* @summary Test ZGC page cache flushing
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* @library /test/lib
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* @run driver gc.z.TestPageCacheFlush
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*/
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import java.util.LinkedList;
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import jdk.test.lib.process.ProcessTools;
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public class TestPageCacheFlush {
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static class Test {
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private static final int K = 1024;
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private static final int M = K * K;
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private static volatile LinkedList<byte[]> keepAlive;
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public static void fillPageCache(int size) {
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System.out.println("Begin allocate (" + size + ")");
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keepAlive = new LinkedList<>();
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try {
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for (;;) {
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keepAlive.add(new byte[size]);
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}
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} catch (OutOfMemoryError e) {
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keepAlive = null;
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System.gc();
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}
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System.out.println("End allocate (" + size + ")");
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}
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public static void main(String[] args) throws Exception {
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// Allocate small objects to fill the page cache with small pages
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fillPageCache(10 * K);
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// Allocate large objects to provoke page cache flushing to rebuild
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// cached small pages into large pages
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fillPageCache(10 * M);
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}
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}
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public static void main(String[] args) throws Exception {
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ProcessTools.executeTestJava(
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"-XX:+UseZGC",
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"-Xms128M",
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"-Xmx128M",
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"-Xlog:gc,gc+init,gc+heap=debug",
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Test.class.getName())
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.outputTo(System.out)
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.errorTo(System.out)
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.shouldContain("Page Cache Flushed:")
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.shouldHaveExitValue(0);
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}
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}
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