1 /* 2 * Copyright (c) 2004, 2017, Oracle and/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 * @bug 4990825 27 * @modules jdk.internal.jvmstat/sun.jvmstat.monitor 28 * @run main/othervm -XX:+UsePerfData PrologSizeSanityCheck 29 * @summary prolog size and overflow sanity checks 30 */ 31 32 import sun.jvmstat.monitor.*; 33 34 public class PrologSizeSanityCheck { 35 36 private static final String sizeName = "sun.perfdata.size"; 37 private static final String usedName = "sun.perfdata.used"; 38 private static final String overflowName = "sun.perfdata.overflow"; 39 private static final int K = 1024; 40 41 public static void main(String args[]) throws Exception { 42 43 VmIdentifier vmid = new VmIdentifier("0"); 44 MonitoredHost localhost = MonitoredHost.getMonitoredHost("localhost"); 45 MonitoredVm self = localhost.getMonitoredVm(vmid); 46 47 IntegerMonitor prologSize = (IntegerMonitor)self.findByName(sizeName); 48 IntegerMonitor prologUsed = (IntegerMonitor)self.findByName(usedName); 49 IntegerMonitor prologOverflow = 50 (IntegerMonitor)self.findByName(overflowName); 51 52 if (prologOverflow.intValue() != 0) { 53 throw new RuntimeException("jvmstat memory buffer overflow: " 54 + sizeName + "=" + prologSize.intValue() 55 + usedName + "=" + prologUsed.intValue() 56 + overflowName + "=" + prologOverflow.intValue() 57 + " : PerfDataMemorySize must be increased"); 58 } 59 60 if (prologUsed.intValue() + 3*K >= prologSize.intValue()) { 61 /* 62 * we want to leave at least 3K of space to allow for long 63 * string names in the various path oriented strings and for 64 * the command line argument and vm argument strings. 3K is 65 * somewhat of an arbitrary figure, but it is based on failure 66 * scenarios observed in SQE when jvmstat was originally 67 * introduced in 1.4.1. 68 */ 69 throw new RuntimeException( 70 "jvmstat memory buffer usage approaching size: " 71 + sizeName + "=" + prologSize.intValue() 72 + usedName + "=" + prologUsed.intValue() 73 + " : consider increasing PerfDataMemorySize"); 74 } 75 } 76 }