92 lines
3.8 KiB
Java
92 lines
3.8 KiB
Java
/*
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* Copyright Amazon.com Inc. 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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/*
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* @test
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* @summary Tests that recursive locking doesn't cause excessive native memory usage
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* @library /test/lib
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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 main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
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* -Xmx100M -XX:AsyncDeflationInterval=0 -XX:GuaranteedAsyncDeflationInterval=0
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* -Xlog:monitorinflation=trace
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* TestRecursiveMonitorChurn
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*/
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import jdk.test.whitebox.WhiteBox;
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import jtreg.SkippedException;
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public class TestRecursiveMonitorChurn {
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static class Monitor {
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public static volatile int i, j;
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synchronized void doSomething() {
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i++;
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doSomethingElse();
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}
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synchronized void doSomethingElse() {
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j++;
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}
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}
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static final WhiteBox WB = WhiteBox.getWhiteBox();
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static final int LM_MONITOR = 0;
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static final int COUNT = 100000;
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public static volatile Monitor monitor;
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public static void main(String[] args) {
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if (WB.getIntVMFlag("LockingMode") == LM_MONITOR) {
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throw new SkippedException("LM_MONITOR always inflates. Invalid test.");
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}
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final long pre_monitor_count = WB.getInUseMonitorCount();
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System.out.println(" Precount = " + pre_monitor_count);
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for (int i = 0; i < COUNT; i++) {
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monitor = new Monitor();
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monitor.doSomething();
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}
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System.out.println("i + j = " + (Monitor.i + Monitor.j));
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final long post_monitor_count = WB.getInUseMonitorCount();
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System.out.println("Postcount = " + post_monitor_count);
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if (pre_monitor_count != post_monitor_count) {
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final long monitor_count_change = post_monitor_count - pre_monitor_count;
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System.out.println("Unexpected change in monitor count: " + monitor_count_change);
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// Intermittent deflation and inflation may occur due to running the test
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// with stress flags (like DeoptimizeALot) or with added instrumentation
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// which runs in the same VM.
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// An arbitrary fuzzy max difference of 10 (= 0.01% of COUNT) is chosen to
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// allow for these occurrences to be skipped while still catching regressions.
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final long fuzzy_max_difference = 10;
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if (Math.abs(monitor_count_change) < fuzzy_max_difference) {
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final String type = monitor_count_change < 0 ? "deflation" : "inflation";
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throw new SkippedException("Intermittent " + type + " detected. Invalid test.");
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}
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if (monitor_count_change < 0) {
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throw new RuntimeException("Unexpected Deflation");
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}
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throw new RuntimeException("Unexpected Inflation");
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}
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}
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}
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