/*

 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * 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.

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#ifndef SHARE_VM_GC_G1_G1EVACSTATS_HPP

#define SHARE_VM_GC_G1_G1EVACSTATS_HPP

#include "gc/shared/plab.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;

  }

  virtual void log_plab_allocation();

  virtual size_t compute_desired_plab_sz();

 public:

  G1EvacStats(const char* description, size_t desired_plab_sz_, unsigned wt);

  ~G1EvacStats();

  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; }

  inline void add_direct_allocated(size_t value);

  inline void add_region_end_waste(size_t value);

  inline void add_failure_used_and_waste(size_t used, size_t waste);

};

#endif // SHARE_VM_GC_G1_G1EVACSTATS_HPP