/*

 * Copyright (c) 2016, 2019, 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

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#ifndef SHARE_GC_G1_G1ANALYTICS_HPP

#define SHARE_GC_G1_G1ANALYTICS_HPP

#include "memory/allocation.hpp"

#include "utilities/globalDefinitions.hpp"

class TruncatedSeq;

class G1Predictions;

class G1Analytics: public CHeapObj<mtGC> {

  const static int TruncatedSeqLength = 10;

  const static int NumPrevPausesForHeuristics = 10;

  const G1Predictions* _predictor;

  // These exclude marking times.

  TruncatedSeq* _recent_gc_times_ms;

  TruncatedSeq* _concurrent_mark_remark_times_ms;

  TruncatedSeq* _concurrent_mark_cleanup_times_ms;

  TruncatedSeq* _alloc_rate_ms_seq;

  double        _prev_collection_pause_end_ms;

  TruncatedSeq* _rs_length_diff_seq;

  TruncatedSeq* _concurrent_refine_rate_ms_seq;

  TruncatedSeq* _logged_cards_rate_ms_seq;

  TruncatedSeq* _constant_other_time_ms_seq;

  TruncatedSeq* _young_other_cost_per_region_ms_seq;

  TruncatedSeq* _non_young_other_cost_per_region_ms_seq;

  TruncatedSeq* _pending_cards_seq;

  TruncatedSeq* _rs_length_seq;

  TruncatedSeq* _cost_per_byte_ms_during_cm_seq;

  // Statistics kept per GC stoppage, pause or full.

  TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec;

  // The ratio of gc time to elapsed time, computed over recent pauses,

  // and the ratio for just the last pause.

  double _recent_avg_pause_time_ratio;

  double _last_pause_time_ratio;

  double get_new_prediction(TruncatedSeq const* seq) const;

  size_t get_new_size_prediction(TruncatedSeq const* seq) const;

public:

  G1Analytics(const G1Predictions* predictor);

  double prev_collection_pause_end_ms() const {

    return _prev_collection_pause_end_ms;

  }

  double recent_avg_pause_time_ratio() const {

    return _recent_avg_pause_time_ratio;

  }

  double last_pause_time_ratio() const {

    return _last_pause_time_ratio;

  }

  uint number_of_recorded_pause_times() const {

    return NumPrevPausesForHeuristics;

  }

  void append_prev_collection_pause_end_ms(double ms) {

    _prev_collection_pause_end_ms += ms;

  }

  void report_concurrent_mark_remark_times_ms(double ms);

  void report_concurrent_mark_cleanup_times_ms(double ms);

  void report_alloc_rate_ms(double alloc_rate);

  void report_concurrent_refine_rate_ms(double cards_per_ms);

  void report_logged_cards_rate_ms(double cards_per_ms);

  void report_rs_length_diff(double rs_length_diff);

  void report_cost_per_byte_ms(double cost_per_byte_ms, bool mark_or_rebuild_in_progress);

  void report_young_other_cost_per_region_ms(double other_cost_per_region_ms);

  void report_non_young_other_cost_per_region_ms(double other_cost_per_region_ms);

  void report_constant_other_time_ms(double constant_other_time_ms);

  void report_pending_cards(double pending_cards);

  void report_rs_length(double rs_length);

  double predict_alloc_rate_ms() const;

  int num_alloc_rate_ms() const;

  double predict_concurrent_refine_rate_ms() const;

  double predict_logged_cards_rate_ms() const;

  double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) const;

  double predict_object_copy_time_ms(size_t bytes_to_copy, bool during_concurrent_mark) const;

  double predict_constant_other_time_ms() const;

  double predict_young_other_time_ms(size_t young_num) const;

  double predict_non_young_other_time_ms(size_t non_young_num) const;

  double predict_remark_time_ms() const;

  double predict_cleanup_time_ms() const;

  size_t predict_rs_length() const;

  size_t predict_pending_cards() const;

  // Add a new GC of the given duration and end time to the record.

  void update_recent_gc_times(double end_time_sec, double elapsed_ms);

  void compute_pause_time_ratio(double interval_ms, double pause_time_ms);

  double last_known_gc_end_time_sec() const;

};

#endif // SHARE_GC_G1_G1ANALYTICS_HPP