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 /** 27 * @test 28 * @summary Checks the Recent garbage storage system. 29 * @build Frame 30 * @compile HeapMonitorRecentTest.java 31 * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorRecentTest 32 */ 33 34 public class HeapMonitorRecentTest { 35 static { 36 try { 37 System.loadLibrary("HeapMonitor"); 38 } catch (UnsatisfiedLinkError ule) { 39 System.err.println("Could not load HeapMonitor library"); 40 System.err.println("java.library.path: " 41 + System.getProperty("java.library.path")); 42 throw ule; 43 } 44 } 45 46 private static int g_tmp[]; 47 48 private native static int checkLiveOrRecentFrames(Frame[] frames); 49 private native static int checkLiveAndRecentFrames(Frame[] frames); 50 private native static int enableSampling(); 51 52 private static int helper() { 53 int sum = 0; 54 // Let us assume that the array is 24 bytes of memory. 55 for (int i = 0; i < 127000 / 6; i++) { 56 int tmp[] = new int[1]; 57 // Force it to be kept. 58 g_tmp = tmp; 59 sum += g_tmp[0]; 60 } 61 return sum; 62 } 63 64 private static void runner(int max) { 65 int sum = 0; 66 for (int j = 0; j < max; j++) { 67 sum += helper(); 68 } 69 System.out.println(sum); 70 } 71 72 public static void main(String[] args) { 73 Frame[] frames = new Frame[3]; 74 frames[0] = new Frame("helper", "()I", "HeapMonitorRecentTest.java", 56); 75 frames[1] = new Frame("runner", "(I)V", "HeapMonitorRecentTest.java", 67); 76 frames[2] = new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorRecentTest.java", 81); 77 78 enableSampling(); 79 // We are testing for the recent garbage sampler: 80 // First run for 10000 iterations to fill up the garbage sampler. 81 runner(10000); 82 83 // Now because we are in a different stack frame line here, we can just re-use the same runner. 84 // Run for 3, we really should not see that many of these and most should be the first type. 85 runner(5000); 86 87 // We should no longer have the initial frames. 88 int status = checkLiveOrRecentFrames(frames); 89 if (status != 0) { 90 throw new RuntimeException("Non-zero status returned from the agent: " + status); 91 } 92 93 // Change the last frame only since the rest is identical. 94 frames[2].lineNumber = 85; 95 96 // We should see those new frames. 97 status = checkLiveAndRecentFrames(frames); 98 if (status == 0) { 99 throw new RuntimeException("Non-zero status returned from the agent: " + status); 100 } 101 } 102 }