1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package art; 18 19 import java.util.ArrayList; 20 21 public class Test908 { 22 public static void run() throws Exception { 23 doTest(); 24 } 25 26 public static void doTest() throws Exception { 27 // Use a list to ensure objects must be allocated. 28 ArrayList<Object> l = new ArrayList<>(100); 29 30 setupGcCallback(); 31 32 enableGcTracking(true); 33 run(l); 34 35 enableGcTracking(false); 36 run(l); 37 } 38 39 private static void run(ArrayList<Object> l) { 40 allocate(l, 1); 41 l.clear(); 42 43 Runtime.getRuntime().gc(); 44 45 printStats(); 46 47 // Note: the reporting will not depend on the heap layout (which could be unstable). Walking 48 // the tag table should give us a stable output order. 49 for (int i = 10; i <= 1000; i *= 10) { 50 allocate(l, i); 51 } 52 l.clear(); 53 54 Runtime.getRuntime().gc(); 55 56 printStats(); 57 58 Runtime.getRuntime().gc(); 59 60 printStats(); 61 } 62 63 private static void allocate(ArrayList<Object> l, long tag) { 64 Object obj = new Object(); 65 l.add(obj); 66 } 67 68 private static void printStats() { 69 System.out.println("---"); 70 int s = getGcStarts(); 71 int f = getGcFinishes(); 72 System.out.println((s > 0) + " " + (f > 0)); 73 } 74 75 private static native void setupGcCallback(); 76 private static native void enableGcTracking(boolean enable); 77 private static native int getGcStarts(); 78 private static native int getGcFinishes(); 79 } 80
