1 /*
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11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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13  * accompanied this code).
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23 
24 package gc.metaspace;
25 
26 import java.util.List;
27 import java.lang.management.*;
28 
29 import jdk.test.lib.Platform;
30 import static jdk.test.lib.Asserts.*;
31 import gc.testlibrary.PerfCounters;
32 
33 /* @test TestPerfCountersAndMemoryPools
34  * @bug 8023476
35  * @library /test/lib /
36  * @requires vm.gc.Serial
37  * @summary Tests that a MemoryPoolMXBeans and PerfCounters for metaspace
38  *          report the same data.
39  * @modules java.base/jdk.internal.misc
40  *          java.management
41  *          jdk.internal.jvmstat/sun.jvmstat.monitor
42  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedClassPointers -XX:+UseSerialGC -XX:+UsePerfData -Xint gc.metaspace.TestPerfCountersAndMemoryPools
43  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedClassPointers -XX:+UseSerialGC -XX:+UsePerfData -Xint gc.metaspace.TestPerfCountersAndMemoryPools
44  */
45 public class TestPerfCountersAndMemoryPools {
main(String[] args)46     public static void main(String[] args) throws Exception {
47         checkMemoryUsage("Metaspace", "sun.gc.metaspace");
48 
49         if (InputArguments.contains("-XX:+UseCompressedClassPointers") && Platform.is64bit()) {
50             checkMemoryUsage("Compressed Class Space", "sun.gc.compressedclassspace");
51         }
52     }
53 
getMemoryPool(String memoryPoolName)54     private static MemoryPoolMXBean getMemoryPool(String memoryPoolName) {
55         List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
56         for (MemoryPoolMXBean pool : pools) {
57             if (pool.getName().equals(memoryPoolName)) {
58                 return pool;
59             }
60         }
61 
62         throw new RuntimeException("Excpted to find a memory pool with name " +
63                                    memoryPoolName);
64     }
65 
checkMemoryUsage(String memoryPoolName, String perfNS)66     private static void checkMemoryUsage(String memoryPoolName, String perfNS)
67         throws Exception {
68         MemoryPoolMXBean pool = getMemoryPool(memoryPoolName);
69 
70         // First, call all the methods to let them allocate their own slab of metadata
71         getMinCapacity(perfNS);
72         getCapacity(perfNS);
73         getUsed(perfNS);
74         pool.getUsage().getInit();
75         pool.getUsage().getUsed();
76         pool.getUsage().getCommitted();
77         assertEQ(1L, 1L, "Make assert load");
78 
79         // Must do a GC to update performance counters
80         System.gc();
81         assertEQ(getMinCapacity(perfNS), pool.getUsage().getInit(), "MinCapacity out of sync");
82 
83         // Adding a second GC due to metadata allocations caused by getting the
84         // initial size from the pool. This is needed when running with -Xcomp.
85         System.gc();
86         assertEQ(getUsed(perfNS), pool.getUsage().getUsed(), "Used out of sync");
87         assertEQ(getCapacity(perfNS), pool.getUsage().getCommitted(), "Committed out of sync");
88     }
89 
getMinCapacity(String ns)90     private static long getMinCapacity(String ns) throws Exception {
91         return PerfCounters.findByName(ns + ".minCapacity").longValue();
92     }
93 
getCapacity(String ns)94     private static long getCapacity(String ns) throws Exception {
95         return PerfCounters.findByName(ns + ".capacity").longValue();
96     }
97 
getUsed(String ns)98     private static long getUsed(String ns) throws Exception {
99         return PerfCounters.findByName(ns + ".used").longValue();
100     }
101 }
102