/*

 * Copyright (c) 2007, 2010, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "gc_implementation/g1/g1CollectedHeap.hpp"

#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"

#include "gc_implementation/g1/g1CollectorPolicy.hpp"

#include "gc_implementation/g1/heapRegion.hpp"

#include "services/g1MemoryPool.hpp"

G1MemoryPoolSuper::G1MemoryPoolSuper(G1CollectedHeap* g1h,

                                     const char* name,

                                     size_t init_size,

                                     bool support_usage_threshold) :

  _g1h(g1h), CollectedMemoryPool(name,

                                 MemoryPool::Heap,

                                 init_size,

                                 undefined_max(),

                                 support_usage_threshold) {

  assert(UseG1GC, "sanity");

}

// See the comment at the top of g1MemoryPool.hpp

size_t G1MemoryPoolSuper::eden_space_committed(G1CollectedHeap* g1h) {

  return MAX2(eden_space_used(g1h), (size_t) HeapRegion::GrainBytes);

}

// See the comment at the top of g1MemoryPool.hpp

size_t G1MemoryPoolSuper::eden_space_used(G1CollectedHeap* g1h) {

  size_t young_list_length = g1h->young_list()->length();

  size_t eden_used = young_list_length * HeapRegion::GrainBytes;

  size_t survivor_used = survivor_space_used(g1h);

  eden_used = subtract_up_to_zero(eden_used, survivor_used);

  return eden_used;

}

// See the comment at the top of g1MemoryPool.hpp

size_t G1MemoryPoolSuper::survivor_space_committed(G1CollectedHeap* g1h) {

  return MAX2(survivor_space_used(g1h), (size_t) HeapRegion::GrainBytes);

}

// See the comment at the top of g1MemoryPool.hpp

size_t G1MemoryPoolSuper::survivor_space_used(G1CollectedHeap* g1h) {

  size_t survivor_num = g1h->g1_policy()->recorded_survivor_regions();

  size_t survivor_used = survivor_num * HeapRegion::GrainBytes;

  return survivor_used;

}

// See the comment at the top of g1MemoryPool.hpp

size_t G1MemoryPoolSuper::old_space_committed(G1CollectedHeap* g1h) {

  size_t committed = overall_committed(g1h);

  size_t eden_committed = eden_space_committed(g1h);

  size_t survivor_committed = survivor_space_committed(g1h);

  committed = subtract_up_to_zero(committed, eden_committed);

  committed = subtract_up_to_zero(committed, survivor_committed);

  committed = MAX2(committed, (size_t) HeapRegion::GrainBytes);

  return committed;

}

// See the comment at the top of g1MemoryPool.hpp

size_t G1MemoryPoolSuper::old_space_used(G1CollectedHeap* g1h) {

  size_t used = overall_used(g1h);

  size_t eden_used = eden_space_used(g1h);

  size_t survivor_used = survivor_space_used(g1h);

  used = subtract_up_to_zero(used, eden_used);

  used = subtract_up_to_zero(used, survivor_used);

  return used;

}

G1EdenPool::G1EdenPool(G1CollectedHeap* g1h) :

  G1MemoryPoolSuper(g1h,

                    "G1 Eden",

                    eden_space_committed(g1h), /* init_size */

                    false /* support_usage_threshold */) { }

MemoryUsage G1EdenPool::get_memory_usage() {

  size_t initial_sz = initial_size();

  size_t max_sz     = max_size();

  size_t used       = used_in_bytes();

  size_t committed  = eden_space_committed(_g1h);

  return MemoryUsage(initial_sz, used, committed, max_sz);

}

G1SurvivorPool::G1SurvivorPool(G1CollectedHeap* g1h) :

  G1MemoryPoolSuper(g1h,

                    "G1 Survivor",

                    survivor_space_committed(g1h), /* init_size */

                    false /* support_usage_threshold */) { }

MemoryUsage G1SurvivorPool::get_memory_usage() {

  size_t initial_sz = initial_size();

  size_t max_sz     = max_size();

  size_t used       = used_in_bytes();

  size_t committed  = survivor_space_committed(_g1h);

  return MemoryUsage(initial_sz, used, committed, max_sz);

}

G1OldGenPool::G1OldGenPool(G1CollectedHeap* g1h) :

  G1MemoryPoolSuper(g1h,

                    "G1 Old Gen",

                    old_space_committed(g1h), /* init_size */

                    true /* support_usage_threshold */) { }

MemoryUsage G1OldGenPool::get_memory_usage() {

  size_t initial_sz = initial_size();

  size_t max_sz     = max_size();

  size_t used       = used_in_bytes();

  size_t committed  = old_space_committed(_g1h);

  return MemoryUsage(initial_sz, used, committed, max_sz);

}