/*

 * Copyright (c) 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

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

 * questions.

 *

 */

#include "precompiled.hpp"

#include "gc/g1/g1CollectedHeap.hpp"

#include "gc/g1/g1HeapTransition.hpp"

#include "gc/g1/g1Policy.hpp"

#include "logging/log.hpp"

#include "memory/metaspace.hpp"

G1HeapTransition::Data::Data(G1CollectedHeap* g1_heap) {

  _eden_length = g1_heap->eden_regions_count();

  _survivor_length = g1_heap->survivor_regions_count();

  _old_length = g1_heap->old_regions_count();

  _humongous_length = g1_heap->humongous_regions_count();

}

G1HeapTransition::G1HeapTransition(G1CollectedHeap* g1_heap) : _g1_heap(g1_heap), _before(g1_heap) { }

struct DetailedUsage : public StackObj {

  size_t _eden_used;

  size_t _survivor_used;

  size_t _old_used;

  size_t _humongous_used;

  size_t _eden_region_count;

  size_t _survivor_region_count;

  size_t _old_region_count;

  size_t _humongous_region_count;

  DetailedUsage() :

    _eden_used(0), _survivor_used(0), _old_used(0), _humongous_used(0),

    _eden_region_count(0), _survivor_region_count(0), _old_region_count(0), _humongous_region_count(0) {}

};

class DetailedUsageClosure: public HeapRegionClosure {

public:

  DetailedUsage _usage;

  bool do_heap_region(HeapRegion* r) {

    if (r->is_old()) {

      _usage._old_used += r->used();

      _usage._old_region_count++;

    } else if (r->is_survivor()) {

      _usage._survivor_used += r->used();

      _usage._survivor_region_count++;

    } else if (r->is_eden()) {

      _usage._eden_used += r->used();

      _usage._eden_region_count++;

    } else if (r->is_humongous()) {

      _usage._humongous_used += r->used();

      _usage._humongous_region_count++;

    } else {

      assert(r->used() == 0, "Expected used to be 0 but it was " SIZE_FORMAT, r->used());

    }

    return false;

  }

};

void G1HeapTransition::print() {

  Data after(_g1_heap);

  size_t eden_capacity_length_after_gc = _g1_heap->g1_policy()->young_list_target_length() - after._survivor_length;

  size_t survivor_capacity_length_after_gc = _g1_heap->g1_policy()->max_survivor_regions();

  DetailedUsage usage;

  if (log_is_enabled(Trace, gc, heap)) {

    DetailedUsageClosure blk;

    _g1_heap->heap_region_iterate(&blk);

    usage = blk._usage;

    assert(usage._eden_region_count == 0, "Expected no eden regions, but got " SIZE_FORMAT, usage._eden_region_count);

    assert(usage._survivor_region_count == after._survivor_length, "Expected survivors to be " SIZE_FORMAT " but was " SIZE_FORMAT,

        after._survivor_length, usage._survivor_region_count);

    assert(usage._old_region_count == after._old_length, "Expected old to be " SIZE_FORMAT " but was " SIZE_FORMAT,

        after._old_length, usage._old_region_count);

    assert(usage._humongous_region_count == after._humongous_length, "Expected humongous to be " SIZE_FORMAT " but was " SIZE_FORMAT,

        after._humongous_length, usage._humongous_region_count);

  }

  log_info(gc, heap)("Eden regions: " SIZE_FORMAT "->" SIZE_FORMAT "("  SIZE_FORMAT ")",

                     _before._eden_length, after._eden_length, eden_capacity_length_after_gc);

  log_trace(gc, heap)(" Used: 0K, Waste: 0K");

  log_info(gc, heap)("Survivor regions: " SIZE_FORMAT "->" SIZE_FORMAT "("  SIZE_FORMAT ")",

                     _before._survivor_length, after._survivor_length, survivor_capacity_length_after_gc);

  log_trace(gc, heap)(" Used: " SIZE_FORMAT "K, Waste: " SIZE_FORMAT "K",

      usage._survivor_used / K, ((after._survivor_length * HeapRegion::GrainBytes) - usage._survivor_used) / K);

  log_info(gc, heap)("Old regions: " SIZE_FORMAT "->" SIZE_FORMAT,

                     _before._old_length, after._old_length);

  log_trace(gc, heap)(" Used: " SIZE_FORMAT "K, Waste: " SIZE_FORMAT "K",

      usage._old_used / K, ((after._old_length * HeapRegion::GrainBytes) - usage._old_used) / K);

  log_info(gc, heap)("Humongous regions: " SIZE_FORMAT "->" SIZE_FORMAT,

                     _before._humongous_length, after._humongous_length);

  log_trace(gc, heap)(" Used: " SIZE_FORMAT "K, Waste: " SIZE_FORMAT "K",

      usage._humongous_used / K, ((after._humongous_length * HeapRegion::GrainBytes) - usage._humongous_used) / K);

}