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8020467: Inconsistency between usage.getUsed() and isUsageThresholdExceeded() with CMS Old Gen pool

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Reviewed-by: mchung, brutisso
This commit is contained in:
Jaroslav Bachorik 2013-10-30 17:54:48 +01:00
parent fed302b41d
commit 292c14d972
1 changed files with 9 additions and 2 deletions
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11
jdk/test/java/lang/management/MemoryPoolMXBean/ThresholdTest.java
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@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* *
* This code is free software; you can redistribute it and/or modify it * This code is free software; you can redistribute it and/or modify it
@ -28,7 +28,7 @@
* MemoryPoolMXBean.isCollectionThresholdExceeded(). * MemoryPoolMXBean.isCollectionThresholdExceeded().
* @author Mandy Chung * @author Mandy Chung
* *
* @run main ThresholdTest * @run main/othervm ThresholdTest
*/ */
import java.lang.management.*; import java.lang.management.*;
@ -36,6 +36,9 @@ import java.util.*;
public class ThresholdTest { public class ThresholdTest {
public static void main(String args[]) throws Exception { public static void main(String args[]) throws Exception {
long[] bigObject = new long[1000000];
System.gc(); // force an initial full-gc
List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans(); List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
try { try {
for (MemoryPoolMXBean p : pools) { for (MemoryPoolMXBean p : pools) {
@ -82,6 +85,10 @@ public class ThresholdTest {
} }
p.setUsageThreshold(1); p.setUsageThreshold(1);
// force a full gc to minimize the likelihood of running GC
// between getting the usage and checking the threshold
System.gc();
MemoryUsage u = p.getUsage(); MemoryUsage u = p.getUsage();
if (u.getUsed() >= 1) { if (u.getUsed() >= 1) {
if (!p.isUsageThresholdExceeded()) { if (!p.isUsageThresholdExceeded()) {