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 }