--- /dev/null 2017-05-01 09:42:45.355096588 -0700 +++ new/test/serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorStatTest.java 2017-06-27 14:19:13.124508306 -0700 @@ -0,0 +1,89 @@ +/* + * Copyright (c) 2017, Google and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +package MyPackage; + +/** + * @test + * @summary Verifies the JVMTI Heap Monitor Statistics + * @build Frame + * @compile HeapMonitorStatTest.java + * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorStatTest + */ + +import java.io.PrintStream; + +public class HeapMonitorStatTest { + + static { + try { + System.loadLibrary("HeapMonitor"); + } catch (UnsatisfiedLinkError ule) { + System.err.println("Could not load HeapMonitor library"); + System.err.println("java.library.path: " + + System.getProperty("java.library.path")); + throw ule; + } + } + + native static int statsNull(); + native static int enableSampling(); + + public static int cnt; + public static int g_tmp[]; + public int array[]; + + public static int helper() { + int sum = 0; + // Let us assume that the array is 24 bytes of memory. + for (int i = 0; i < 127000 / 6; i++) { + int tmp[] = new int[1]; + // Force it to be kept. + g_tmp = tmp; + sum += g_tmp[0]; + } + return sum; + } + + public static void wrapper() { + int sum = 0; + for (int j = 0; j < 1000; j++) { + sum += helper(); + } + System.out.println(sum); + } + + public static void main(String[] args) { + + if (statsNull() == 0) { + throw new RuntimeException("Statistics should be null to begin with."); + } + + enableSampling(); + wrapper(); + + if (statsNull() != 0) { + throw new RuntimeException("Statistics should not be null now."); + } + } +}