/*

 * Copyright (c) 2015, 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.

 *

 */

#ifndef SHARE_VM_gc_G1_G1EVACSTATS_HPP

#define SHARE_VM_gc_G1_G1EVACSTATS_HPP

#include "gc/shared/plab.hpp"

#include "runtime/atomic.hpp"

// Records various memory allocation statistics gathered during evacuation.

class G1EvacStats : public PLABStats {

 private:

  size_t _region_end_waste; // Number of words wasted due to skipping to the next region.

  uint   _regions_filled;   // Number of regions filled completely.

  size_t _direct_allocated; // Number of words allocated directly into the regions.

  // Number of words in live objects remaining in regions that ultimately suffered an

  // evacuation failure. This is used in the regions when the regions are made old regions.

  size_t _failure_used;

  // Number of words wasted in regions which failed evacuation. This is the sum of space

  // for objects successfully copied out of the regions (now dead space) plus waste at the

  // end of regions.

  size_t _failure_waste;

  virtual void reset() {

    PLABStats::reset();

    _region_end_waste = 0;

    _regions_filled = 0;

    _direct_allocated = 0;

    _failure_used = 0;

    _failure_waste = 0;

  }

 public:

  G1EvacStats(size_t desired_plab_sz_, unsigned wt) : PLABStats(desired_plab_sz_, wt),

    _region_end_waste(0), _regions_filled(0), _direct_allocated(0),

    _failure_used(0), _failure_waste(0) {

  }

  virtual void adjust_desired_plab_sz();

  size_t allocated() const { return _allocated; }

  size_t wasted() const { return _wasted; }

  size_t unused() const { return _unused; }

  size_t used() const { return allocated() - (wasted() + unused()); }

  size_t undo_wasted() const { return _undo_wasted; }

  uint regions_filled() const { return _regions_filled; }

  size_t region_end_waste() const { return _region_end_waste; }

  size_t direct_allocated() const { return _direct_allocated; }

  // Amount of space in heapwords used in the failing regions when an evacuation failure happens.

  size_t failure_used() const { return _failure_used; }

  // Amount of space in heapwords wasted (unused) in the failing regions when an evacuation failure happens.

  size_t failure_waste() const { return _failure_waste; }

  void add_direct_allocated(size_t value) {

    Atomic::add_ptr(value, &_direct_allocated);

  }

  void add_region_end_waste(size_t value) {

    Atomic::add_ptr(value, &_region_end_waste);

    Atomic::add_ptr(1, &_regions_filled);

  }

  void add_failure_used_and_waste(size_t used, size_t waste) {

    Atomic::add_ptr(used, &_failure_used);

    Atomic::add_ptr(waste, &_failure_waste);

  }

};

#endif // SHARE_VM_gc_G1_G1EVACSTATS_HPP