1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc/epsilon/epsilonArguments.hpp"
  27 #include "gc/epsilon/epsilonHeap.hpp"
  28 #include "gc/epsilon/epsilonCollectorPolicy.hpp"
  29 #include "gc/shared/gcArguments.inline.hpp"
  30 #include "runtime/globals.hpp"
  31 #include "runtime/globals_extension.hpp"
  32 #include "runtime/vm_version.hpp"
  33 
  34 size_t EpsilonArguments::conservative_max_heap_alignment() {
  35   return UseLargePages ? os::large_page_size() : os::vm_page_size();
  36 }
  37 
  38 void EpsilonArguments::initialize() {
  39   GCArguments::initialize();
  40 
  41   assert(UseEpsilonGC, "Sanity");
  42 
  43   // Forcefully exit when OOME is detected. Nothing we can do at that point.
  44   if (FLAG_IS_DEFAULT(ExitOnOutOfMemoryError)) {
  45     FLAG_SET_DEFAULT(ExitOnOutOfMemoryError, true);
  46   }
  47 
  48 #if INCLUDE_EPSILONGC
  49   if (EpsilonMaxTLABSize < MinTLABSize) {
  50     warning("EpsilonMaxTLABSize < MinTLABSize, adjusting it to " SIZE_FORMAT, MinTLABSize);
  51     EpsilonMaxTLABSize = MinTLABSize;
  52   }
  53 
  54   if (!EpsilonElasticTLAB && EpsilonElasticTLABDecay) {
  55     warning("Disabling EpsilonElasticTLABDecay because EpsilonElasticTLAB is disabled");
  56     FLAG_SET_DEFAULT(EpsilonElasticTLABDecay, false);
  57   }
  58 #endif
  59 
  60 #ifdef COMPILER2
  61   // Enable loop strip mining: there are still non-GC safepoints, no need to make it worse
  62   if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) {
  63     FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true);
  64     if (FLAG_IS_DEFAULT(LoopStripMiningIter)) {
  65       FLAG_SET_DEFAULT(LoopStripMiningIter, 1000);
  66     }
  67   }
  68 #endif
  69 }
  70 
  71 CollectedHeap* EpsilonArguments::create_heap() {
  72   return create_heap_with_policy<EpsilonHeap, EpsilonCollectorPolicy>();
  73 }