89 lines
4.0 KiB
Java
89 lines
4.0 KiB
Java
/*
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* Copyright (c) 2021, 2022, 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.g1;
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/*
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* @test TestSkipRebuildRemsetPhase
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* @summary Skip Rebuild Remset Phase if the Remark pause does not identify any rebuild candidates.
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* Fill up a region to above the set G1MixedGCLiveThresholdPercent.
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* @requires vm.gc.G1
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* @library /test/lib
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* @build sun.hotspot.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller sun.hotspot.WhiteBox
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* @run driver gc.g1.TestSkipRebuildRemsetPhase
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*/
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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 sun.hotspot.WhiteBox;
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public class TestSkipRebuildRemsetPhase {
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public static void main(String[] args) throws Exception {
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ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xbootclasspath/a:.",
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"-XX:+UseG1GC",
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"-XX:+UnlockExperimentalVMOptions",
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"-XX:+UnlockDiagnosticVMOptions",
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"-XX:+WhiteBoxAPI",
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"-XX:G1MixedGCLiveThresholdPercent=20",
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"-Xlog:gc+marking=debug,gc+phases=debug,gc+remset+tracking=trace",
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"-Xms10M",
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"-Xmx10M",
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GCTest.class.getName());
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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output.shouldContain("Skipping Remembered Set Rebuild.");
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output.shouldContain("No Remembered Sets to update after rebuild");
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output.shouldHaveExitValue(0);
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}
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public static class GCTest {
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public static void main(String args[]) throws Exception {
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WhiteBox wb = WhiteBox.getWhiteBox();
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// Allocate some memory less than region size.
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Object used = alloc();
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// Trigger the full GC using the WhiteBox API.
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wb.fullGC(); // full
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// Memory objects have been promoted to old by full GC.
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// Concurrent cycle should not select any regions for rebuilding
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wb.g1StartConcMarkCycle(); // concurrent-start, remark and cleanup
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// Sleep to make sure concurrent cycle is done
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while (wb.g1InConcurrentMark()) {
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Thread.sleep(1000);
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}
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System.out.println(used);
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}
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private static Object alloc() {
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// Since G1MixedGCLiveThresholdPercent is 20%, make sure to allocate object larger than that
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// so that it will not be collected and the expected message printed.
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final int objectSize = WhiteBox.getWhiteBox().g1RegionSize() / 3;
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Object ret = new byte[objectSize];
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return ret;
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}
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}
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}
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