1 /* 2 * Copyright (c) 2014, 2015, 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 SpaceUtilizationCheck 26 * @summary Check if the space utilization for shared spaces is adequate 27 * @library /testlibrary 28 * @modules java.base/jdk.internal.misc 29 * java.management 30 * @run main SpaceUtilizationCheck 31 */ 32 33 import jdk.test.lib.*; 34 35 import java.util.regex.Pattern; 36 import java.util.regex.Matcher; 37 import java.util.ArrayList; 38 import java.lang.Integer; 39 40 public class SpaceUtilizationCheck { 41 // Minimum allowed utilization value (percent) 42 // The goal is to have this number to be 50% for RO and RW regions 43 // Once that feature is implemented, increase the MIN_UTILIZATION to 50 44 private static final int MIN_UTILIZATION = 30; 45 46 // Only RO and RW regions are considered for this check, since they 47 // currently account for the bulk of the shared space 48 private static final int NUMBER_OF_CHECKED_SHARED_REGIONS = 2; 49 50 public static void main(String[] args) throws Exception { 51 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 52 "-XX:+UnlockDiagnosticVMOptions", 53 "-XX:SharedArchiveFile=./SpaceUtilizationCheck.jsa", 54 "-Xshare:dump"); 55 56 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 57 String stdout = output.getStdout(); 58 ArrayList<String> utilization = findUtilization(stdout); 59 60 if (utilization.size() != NUMBER_OF_CHECKED_SHARED_REGIONS ) 61 throw new RuntimeException("The output format of sharing summary has changed"); 62 63 for(String str : utilization) { 64 int value = Integer.parseInt(str); 65 if (value < MIN_UTILIZATION) { 66 System.out.println(stdout); 67 throw new RuntimeException("Utilization for one of the regions" + 68 "is below a threshold of " + MIN_UTILIZATION + "%"); 69 } 70 } 71 } 72 73 public static ArrayList<String> findUtilization(String input) { 74 ArrayList<String> regions = filterRegionsOfInterest(input.split("\n")); 75 return filterByPattern(filterByPattern(regions, "bytes \\[.*% used\\]"), "\\d+"); 76 } 77 78 private static ArrayList<String> filterByPattern(Iterable<String> input, String pattern) { 79 ArrayList<String> result = new ArrayList<String>(); 80 for (String str : input) { 81 Matcher matcher = Pattern.compile(pattern).matcher(str); 82 if (matcher.find()) { 83 result.add(matcher.group()); 84 } 85 } 86 return result; 87 } 88 89 private static ArrayList<String> filterRegionsOfInterest(String[] inputLines) { 90 ArrayList<String> result = new ArrayList<String>(); 91 for (String str : inputLines) { 92 if (str.contains("ro space:") || str.contains("rw space:")) { 93 result.add(str); 94 } 95 } 96 return result; 97 } 98 }