/*

 * Copyright (c) 2012, 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 "memory/metaspaceCounters.hpp"

#include "memory/resourceArea.hpp"

#include "runtime/globals.hpp"

#include "runtime/perfData.hpp"

#include "utilities/exceptions.hpp"

class MetaspacePerfCounters: public CHeapObj<mtInternal> {

  friend class VMStructs;

  PerfVariable*      _capacity;

  PerfVariable*      _used;

  PerfVariable*      _max_capacity;

  PerfVariable* create_variable(const char *ns, const char *name, size_t value, TRAPS) {

    const char *path = PerfDataManager::counter_name(ns, name);

    return PerfDataManager::create_variable(SUN_GC, path, PerfData::U_Bytes, value, THREAD);

  }

  void create_constant(const char *ns, const char *name, size_t value, TRAPS) {

    const char *path = PerfDataManager::counter_name(ns, name);

    PerfDataManager::create_constant(SUN_GC, path, PerfData::U_Bytes, value, THREAD);

  }

 public:

  MetaspacePerfCounters(const char* ns, size_t min_capacity, size_t curr_capacity, size_t max_capacity, size_t used) {

    EXCEPTION_MARK;

    ResourceMark rm;

    create_constant(ns, "minCapacity", min_capacity, THREAD);

    _capacity = create_variable(ns, "capacity", curr_capacity, THREAD);

    _max_capacity = create_variable(ns, "maxCapacity", max_capacity, THREAD);

    _used = create_variable(ns, "used", used, THREAD);

  }

  void update(size_t capacity, size_t max_capacity, size_t used) {

    _capacity->set_value(capacity);

    _max_capacity->set_value(max_capacity);

    _used->set_value(used);

  }

};

MetaspacePerfCounters* MetaspaceCounters::_perf_counters = NULL;

size_t MetaspaceCounters::calculate_capacity() {

  // The total capacity is the sum of

  //   1) capacity of Metachunks in use by all Metaspaces

  //   2) unused space at the end of each Metachunk

  //   3) space in the freelist

  size_t total_capacity = MetaspaceAux::allocated_capacity_bytes()

    + MetaspaceAux::free_bytes() + MetaspaceAux::free_chunks_total_bytes();

  return total_capacity;

}

void MetaspaceCounters::initialize_performance_counters() {

  if (UsePerfData) {

    assert(_perf_counters == NULL, "Should only be initialized once");

    size_t min_capacity = MetaspaceAux::min_chunk_size_bytes();

    size_t capacity = calculate_capacity();

    size_t max_capacity = MetaspaceAux::reserved_bytes();

    size_t used = MetaspaceAux::allocated_used_bytes();

    _perf_counters = new MetaspacePerfCounters("metaspace", min_capacity, capacity, max_capacity, used);

  }

}

void MetaspaceCounters::update_performance_counters() {

  if (UsePerfData) {

    assert(_perf_counters != NULL, "Should be initialized");

    size_t capacity = calculate_capacity();

    size_t max_capacity = MetaspaceAux::reserved_bytes();

    size_t used = MetaspaceAux::allocated_used_bytes();

    _perf_counters->update(capacity, max_capacity, used);

  }

}

MetaspacePerfCounters* CompressedClassSpaceCounters::_perf_counters = NULL;

size_t CompressedClassSpaceCounters::calculate_capacity() {

    return MetaspaceAux::allocated_capacity_bytes(_class_type) +

           MetaspaceAux::free_bytes(_class_type) +

           MetaspaceAux::free_chunks_total_bytes(_class_type);

}

void CompressedClassSpaceCounters::update_performance_counters() {

  if (UsePerfData && UseCompressedClassPointers) {

    assert(_perf_counters != NULL, "Should be initialized");

    size_t capacity = calculate_capacity();

    size_t max_capacity = MetaspaceAux::reserved_bytes(_class_type);

    size_t used = MetaspaceAux::allocated_used_bytes(_class_type);

    _perf_counters->update(capacity, max_capacity, used);

  }

}

void CompressedClassSpaceCounters::initialize_performance_counters() {

  if (UsePerfData) {

    assert(_perf_counters == NULL, "Should only be initialized once");

    const char* ns = "compressedclassspace";

    if (UseCompressedClassPointers) {

      size_t min_capacity = MetaspaceAux::min_chunk_size_bytes();

      size_t capacity = calculate_capacity();

      size_t max_capacity = MetaspaceAux::reserved_bytes(_class_type);

      size_t used = MetaspaceAux::allocated_used_bytes(_class_type);

      _perf_counters = new MetaspacePerfCounters(ns, min_capacity, capacity, max_capacity, used);

    } else {

      _perf_counters = new MetaspacePerfCounters(ns, 0, 0, 0, 0);

    }

  }

}