130 lines
5.4 KiB
Java
130 lines
5.4 KiB
Java
/*
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* Copyright (c) 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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/* @test
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* @summary Test pinned objects lifecycle from young gen to eventual reclamation.
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* @requires vm.gc.G1
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run driver gc.g1.pinnedobjs.TestPinnedObjectsEvacuation
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*/
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package gc.g1.pinnedobjs;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import jdk.test.lib.Asserts;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.whitebox.WhiteBox;
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public class TestPinnedObjectsEvacuation {
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public static void main(String[] args) throws Exception {
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testPinnedEvacuation(0, 0, 0, 1);
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testPinnedEvacuation(1, 1, 0, 1);
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testPinnedEvacuation(2, 1, 1, 0);
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testPinnedEvacuation(3, 1, 1, 0);
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}
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private static int numMatches(String stringToMatch, String pattern) {
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Pattern r = Pattern.compile(pattern);
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Matcher m = r.matcher(stringToMatch);
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return (int)m.results().count();
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}
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private static void assertMatches(int expected, int actual, String what) {
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if (expected != actual) {
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Asserts.fail("Expected " + expected + " " + what + " events but got " + actual);
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}
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}
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private static void testPinnedEvacuation(int younGCsBeforeUnpin, int expectedSkipEvents, int expectedDropEvents, int expectedReclaimEvents) throws Exception {
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OutputAnalyzer output = ProcessTools.executeLimitedTestJava("-XX:+UseG1GC",
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"-XX:+UnlockDiagnosticVMOptions",
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"-XX:+WhiteBoxAPI",
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"-Xbootclasspath/a:.",
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"-Xmx32M",
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"-Xmn16M",
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"-XX:G1NumCollectionsKeepPinned=2",
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"-XX:+VerifyAfterGC",
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"-Xlog:gc,gc+ergo+cset=trace",
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TestObjectPin.class.getName(),
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String.valueOf(younGCsBeforeUnpin));
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System.out.println(output.getStdout());
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output.shouldHaveExitValue(0);
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assertMatches(expectedSkipEvents, numMatches(output.getStdout(), ".*Retained candidate \\d+ can not be reclaimed currently. Skipping.*"), "skip");
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assertMatches(expectedDropEvents, numMatches(output.getStdout(), ".*Retained candidate \\d+ can not be reclaimed currently. Dropping.*"), "drop");
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assertMatches(expectedReclaimEvents, numMatches(output.getStdout(), ".*Finish adding retained candidates to collection set. Initial: 1,.*"), "reclaim");
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}
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}
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class TestObjectPin {
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private static final WhiteBox wb = WhiteBox.getWhiteBox();
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public static long pinAndGetAddress(Object o) {
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wb.pinObject(o);
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return wb.getObjectAddress(o);
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}
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public static void unpinAndCompareAddress(Object o, long expectedAddress) {
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Asserts.assertEQ(expectedAddress, wb.getObjectAddress(o), "Object has moved during pinning.");
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wb.unpinObject(o);
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}
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public static void main(String[] args) {
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int youngGCBeforeUnpin = Integer.parseInt(args[0]);
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// Remove garbage from VM initialization.
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wb.fullGC();
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Object o = new int[100];
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Asserts.assertTrue(!wb.isObjectInOldGen(o), "should not be pinned in old gen");
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long address = pinAndGetAddress(o);
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// First young GC: should move the object into old gen.
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wb.youngGC();
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Asserts.assertTrue(wb.isObjectInOldGen(o), "Pinned object not in old gen after young GC");
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// The object is (still) pinned. Do some configurable young gcs that fail to add it to the
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// collection set candidates.
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for (int i = 0; i < youngGCBeforeUnpin; i++) {
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wb.youngGC();
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}
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unpinAndCompareAddress(o, address);
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// Unpinned the object. This next gc should take the region if not dropped.
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wb.youngGC();
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}
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}
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