1 /*
2 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @summary Tests that recursive locking doesn't cause excessive native memory usage
27 * @library /test/lib
28 * @build jdk.test.whitebox.WhiteBox
29 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
30 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
31 * -Xmx100M -XX:AsyncDeflationInterval=0 -XX:GuaranteedAsyncDeflationInterval=0
32 * -Xlog:monitorinflation=trace
33 * TestRecursiveMonitorChurn
34 */
35
36 import jdk.test.whitebox.WhiteBox;
37 import jtreg.SkippedException;
38
39 public class TestRecursiveMonitorChurn {
40 static class Monitor {
41 public static volatile int i, j;
42 synchronized void doSomething() {
43 i++;
44 doSomethingElse();
45 }
46 synchronized void doSomethingElse() {
47 j++;
48 }
49 }
50
51 static final WhiteBox WB = WhiteBox.getWhiteBox();
52 static final int LM_MONITOR = 0;
53 static final int COUNT = 100000;
54
55 public static volatile Monitor monitor;
56 public static void main(String[] args) {
57 if (WB.getIntVMFlag("LockingMode") == LM_MONITOR) {
58 throw new SkippedException("LM_MONITOR always inflates. Invalid test.");
59 }
60 System.out.println("Starting test...");
61 final long pre_monitor_count = WB.getInUseMonitorCount();
62 System.out.println(" Precount = " + pre_monitor_count);
63 for (int i = 0; i < COUNT; i++) {
64 monitor = new Monitor();
65 monitor.doSomething();
66 }
67 System.out.println("i + j = " + (Monitor.i + Monitor.j));
68 final long post_monitor_count = WB.getInUseMonitorCount();
69 System.out.println("Postcount = " + post_monitor_count);
70
71 if (pre_monitor_count != post_monitor_count) {
72 final long monitor_count_change = post_monitor_count - pre_monitor_count;
73 System.out.println("Unexpected change in monitor count: " + monitor_count_change);
74
75 // Intermittent deflation and inflation may occur due to running the test
76 // with stress flags (like DeoptimizeALot) or with added instrumentation
77 // which runs in the same VM.
78 // An arbitrary fuzzy max difference of 10 (= 0.01% of COUNT) is chosen to
79 // allow for these occurrences to be skipped while still catching regressions.
80 final long fuzzy_max_difference = 10;
81 if (Math.abs(monitor_count_change) < fuzzy_max_difference) {
82 final String type = monitor_count_change < 0 ? "deflation" : "inflation";
83 throw new SkippedException("Intermittent " + type + " detected. Invalid test.");
84 }
85
86 if (monitor_count_change < 0) {
87 throw new RuntimeException("Unexpected Deflation");
88 }
89 throw new RuntimeException("Unexpected Inflation");
90 }
91 }
92 }