/*

 * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.

 * 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.

 *

 */

#include "precompiled.hpp"

#include "gc/parallel/parallelArguments.hpp"

#include "gc/parallel/parallelScavengeHeap.hpp"

#include "gc/shared/adaptiveSizePolicy.hpp"

#include "gc/shared/collectorPolicy.hpp"

#include "gc/shared/gcArguments.inline.hpp"

#include "runtime/globals.hpp"

#include "runtime/globals_extension.hpp"

#include "runtime/java.hpp"

#include "runtime/vm_version.hpp"

#include "utilities/defaultStream.hpp"

size_t ParallelArguments::conservative_max_heap_alignment() {

  return CollectorPolicy::compute_heap_alignment();

}

  assert(UseParallelGC || UseParallelOldGC, "Error");

  // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).

  if (FLAG_IS_DEFAULT(UseParallelOldGC)) {

    FLAG_SET_DEFAULT(UseParallelOldGC, true);

  }

  FLAG_SET_DEFAULT(UseParallelGC, true);

  // If no heap maximum was requested explicitly, use some reasonable fraction

  // of the physical memory, up to a maximum of 1GB.

  FLAG_SET_DEFAULT(ParallelGCThreads,

                   Abstract_VM_Version::parallel_worker_threads());

  if (ParallelGCThreads == 0) {

    jio_fprintf(defaultStream::error_stream(),

        "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");

    vm_exit(1);

  }

  if (UseAdaptiveSizePolicy) {

    // We don't want to limit adaptive heap sizing's freedom to adjust the heap

    // unless the user actually sets these flags.

    if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {

      FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);

    }

    if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {

      FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);

    }

  }

  // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the

  // SurvivorRatio has been set, reset their default values to SurvivorRatio +

  // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.

  // See CR 6362902 for details.

  if (!FLAG_IS_DEFAULT(SurvivorRatio)) {

    if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {

       FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);

    }

    if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {

      FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);

    }

  }

  if (UseParallelOldGC) {

    // Par compact uses lower default values since they are treated as

    // minimums.  These are different defaults because of the different

    // interpretation and are not ergonomically set.

    if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {

      FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);

    }

  }

}

CollectedHeap* ParallelArguments::create_heap() {

  return create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>();

}