/*

 * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.

 * 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

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 */

#include "precompiled.hpp"

#include "gc/g1/g1Analytics.hpp"

#include "gc/g1/g1CollectorPolicy.hpp"

#include "gc/g1/g1YoungGenSizer.hpp"

#include "gc/g1/heapRegion.hpp"

#include "gc/g1/heapRegionRemSet.hpp"

#include "gc/shared/gcPolicyCounters.hpp"

#include "runtime/globals.hpp"

#include "utilities/debug.hpp"

G1CollectorPolicy::G1CollectorPolicy() {

  // Set up the region size and associated fields. Given that the

  // policy is created before the heap, we have to set this up here,

  // so it's done as soon as possible.

  // It would have been natural to pass initial_heap_byte_size() and

  // max_heap_byte_size() to setup_heap_region_size() but those have

  // not been set up at this point since they should be aligned with

  // the region size. So, there is a circular dependency here. We base

  // the region size on the heap size, but the heap size should be

  // aligned with the region size. To get around this we use the

  // unaligned values for the heap.

  HeapRegion::setup_heap_region_size(InitialHeapSize, MaxHeapSize);

  HeapRegionRemSet::setup_remset_size();

}

void G1CollectorPolicy::initialize_alignments() {

  _space_alignment = HeapRegion::GrainBytes;

  size_t card_table_alignment = CardTableRS::ct_max_alignment_constraint();

  size_t page_size = UseLargePages ? os::large_page_size() : os::vm_page_size();

  _heap_alignment = MAX3(card_table_alignment, _space_alignment, page_size);

}