| /* |
| * Copyright (c) 2014, 2015, Oracle 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. |
| */ |
| |
| /** |
| * @test TestSmallHeap |
| * @bug 8067438 |
| * @requires vm.gc=="null" |
| * @requires (vm.opt.AggressiveOpts=="null") | (vm.opt.AggressiveOpts=="false") |
| * @requires vm.compMode != "Xcomp" |
| * @requires vm.opt.UseCompressedOops != false |
| * @summary Verify that starting the VM with a small heap works |
| * @library /testlibrary /test/lib |
| * @modules java.base/jdk.internal.misc |
| * @modules java.management/sun.management |
| * @ignore 8076621 |
| * @build TestSmallHeap |
| * @run main ClassFileInstaller sun.hotspot.WhiteBox |
| * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx2m -XX:+UseParallelGC TestSmallHeap |
| * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx2m -XX:+UseSerialGC TestSmallHeap |
| * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx2m -XX:+UseG1GC TestSmallHeap |
| * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx2m -XX:+UseConcMarkSweepGC TestSmallHeap |
| */ |
| |
| /* Note: It would be nice to verify the minimal supported heap size (2m) here, |
| * but we align the heap size based on the card table size. And the card table |
| * size is aligned based on the minimal pages size provided by the os. This |
| * means that on most platforms, where the minimal page size is 4k, we get a |
| * minimal heap size of 2m but on Solaris/Sparc we have a page size of 8k and |
| * get a minimal heap size of 4m. And on platforms where the page size is 64k |
| * we get a minimal heap size of 32m. We never use large pages for the card table. |
| * |
| * There is also no check in the VM for verifying that the maximum heap size |
| * is larger than the supported minimal heap size. This means that specifying |
| * -Xmx1m on the command line is fine but will give a heap of 2m (or 4m or 32m). |
| * |
| * To work around these rather strange behaviors this test uses -Xmx2m but then |
| * calculates what the expected heap size should be. The calculation is a |
| * simplified version of the code in the VM. We assume that the card table will |
| * use one page. Each byte in the card table corresponds to 512 bytes on the heap. |
| * So, the expected heap size is page_size * 512. |
| */ |
| |
| import jdk.test.lib.*; |
| import com.sun.management.HotSpotDiagnosticMXBean; |
| import java.lang.management.ManagementFactory; |
| import static jdk.test.lib.Asserts.*; |
| |
| import sun.hotspot.WhiteBox; |
| |
| public class TestSmallHeap { |
| |
| public static void main(String[] args) { |
| WhiteBox wb = WhiteBox.getWhiteBox(); |
| int pageSize = wb.getVMPageSize(); |
| int heapBytesPerCard = 512; |
| long expectedMaxHeap = pageSize * heapBytesPerCard; |
| String maxHeap |
| = ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class) |
| .getVMOption("MaxHeapSize").getValue(); |
| assertEQ(Long.parseLong(maxHeap), expectedMaxHeap); |
| } |
| } |