1 /* 2 * Copyright (c) 2017, Google 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 package MyPackage; 25 26 import java.util.List; 27 28 /** 29 * @test 30 * @summary Checks the Recent garbage storage system. 31 * @build Frame HeapMonitor 32 * @compile HeapMonitorRecentTest.java 33 * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorRecentTest 34 */ 35 36 public class HeapMonitorRecentTest { 37 38 private native static boolean framesNotInLiveOrRecent(Frame[] frames); 39 private native static boolean framesExistInLiveAndRecent(Frame[] frames); 40 41 private static List<Frame> runner(int max) { 42 List<Frame> frameList = null; 43 for (int j = 0; j < max; j++) { 44 frameList = HeapMonitor.allocate(); 45 } 46 frameList.add(new Frame("runner", "(I)Ljava/util/List;", "HeapMonitorRecentTest.java", 44)); 47 return frameList; 48 } 49 50 public static void main(String[] args) { 51 HeapMonitor.enableSampling(); 52 // We are testing for the recent garbage sampler: 53 // First run for 10000 iterations to fill up the garbage sampler. 54 List<Frame> firstFrameList = runner(10); 55 firstFrameList.add(new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorRecentTest.java", 54)); 56 57 // Now because we are in a different stack frame line here, we can just re-use the same runner. 58 // Run for 3, we really should not see that many of these and most should be the first type. 59 List<Frame> secondFrameList = runner(10); 60 secondFrameList.add(new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorRecentTest.java", 59)); 61 62 // We should no longer have the initial frames. 63 boolean status = framesNotInLiveOrRecent(firstFrameList.toArray(new Frame[0])); 64 if (!status) { 65 throw new RuntimeException("Initial frames still internally there."); 66 } 67 68 // We should see those new frames. 69 status = framesExistInLiveAndRecent(secondFrameList.toArray(new Frame[0])); 70 if (!status) { 71 throw new RuntimeException("Second frame list not found in both live and recent."); 72 } 73 } 74 }