1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
   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 #include "precompiled.hpp"
  27 #include "gc/shared/gcArguments.hpp"
  28 #include "runtime/arguments.hpp"
  29 #include "runtime/globals.hpp"
  30 #include "runtime/globals_extension.hpp"
  31 #include "utilities/macros.hpp"
  32 
  33 void GCArguments::initialize() {
  34 #if INCLUDE_ALL_GCS
  35   if (MinHeapFreeRatio == 100) {
  36     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
  37     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
  38   }
  39 
  40   // If class unloading is disabled, also disable concurrent class unloading.
  41   if (!ClassUnloading) {
  42     FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
  43     FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
  44   }
  45 #endif // INCLUDE_ALL_GCS
  46 }