1 /* 2 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2020 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 import sun.hotspot.WhiteBox; 27 28 public final class Settings { 29 30 public String reclaimPolicy = WhiteBox.getWhiteBox().getStringVMFlag("MetaspaceReclaimPolicy"); 31 public boolean usesAllocationGuards = WhiteBox.getWhiteBox().getBooleanVMFlag("MetaspaceGuardAllocations"); 32 33 final public boolean doesReclaim() { 34 return reclaimPolicy.equals("balanced") || reclaimPolicy.equals("aggessive"); 35 } 36 37 final static long rootChunkWordSize = 512 * 1024; 38 39 static Settings theSettings; 40 41 static Settings settings() { 42 if (theSettings == null) { 43 theSettings = new Settings(); 44 } 45 return theSettings; 46 } 47 48 }