hotspot/src/share/vm/gc/parallel/psAdaptiveSizePolicy.hpp
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/*
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 * Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_PARALLEL_PSADAPTIVESIZEPOLICY_HPP
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#define SHARE_VM_GC_PARALLEL_PSADAPTIVESIZEPOLICY_HPP
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#include "gc/shared/adaptiveSizePolicy.hpp"
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#include "gc/shared/gcCause.hpp"
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#include "gc/shared/gcStats.hpp"
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#include "gc/shared/gcUtil.hpp"
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// This class keeps statistical information and computes the
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// optimal free space for both the young and old generation
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// based on current application characteristics (based on gc cost
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// and application footprint).
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//
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// It also computes an optimal tenuring threshold between the young
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// and old generations, so as to equalize the cost of collections
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// of those generations, as well as optimal survivor space sizes
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// for the young generation.
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//
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// While this class is specifically intended for a generational system
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// consisting of a young gen (containing an Eden and two semi-spaces)
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// and a tenured gen, as well as a perm gen for reflective data, it
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// makes NO references to specific generations.
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//
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// 05/02/2003 Update
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// The 1.5 policy makes use of data gathered for the costs of GC on
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// specific generations.  That data does reference specific
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// generation.  Also diagnostics specific to generations have
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// been added.
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// Forward decls
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class elapsedTimer;
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class PSAdaptiveSizePolicy : public AdaptiveSizePolicy {
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 friend class PSGCAdaptivePolicyCounters;
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  // These values are used to record decisions made during the
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  // policy.  For example, if the young generation was decreased
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  // to decrease the GC cost of minor collections the value
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  // decrease_young_gen_for_throughput_true is used.
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  // Last calculated sizes, in bytes, and aligned
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  // NEEDS_CLEANUP should use sizes.hpp,  but it works in ints, not size_t's
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  // Time statistics
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  AdaptivePaddedAverage* _avg_major_pause;
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  // Footprint statistics
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  AdaptiveWeightedAverage* _avg_base_footprint;
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  // Statistical data gathered for GC
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  GCStats _gc_stats;
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  size_t _survivor_size_limit;   // Limit in bytes of survivor size
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  const double _collection_cost_margin_fraction;
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  // Variable for estimating the major and minor pause times.
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  // These variables represent linear least-squares fits of
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  // the data.
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  //   major pause time vs. old gen size
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  LinearLeastSquareFit* _major_pause_old_estimator;
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  //   major pause time vs. young gen size
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  LinearLeastSquareFit* _major_pause_young_estimator;
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  // These record the most recent collection times.  They
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  // are available as an alternative to using the averages
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  // for making ergonomic decisions.
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  double _latest_major_mutator_interval_seconds;
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  const size_t _space_alignment; // alignment for eden, survivors
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  const double _gc_minor_pause_goal_sec;    // goal for maximum minor gc pause
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  // The amount of live data in the heap at the last full GC, used
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  // as a baseline to help us determine when we need to perform the
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  // next full GC.
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  size_t _live_at_last_full_gc;
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  // decrease/increase the old generation for minor pause time
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  int _change_old_gen_for_min_pauses;
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  // increase/decrease the young generation for major pause time
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  int _change_young_gen_for_maj_pauses;
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  // Flag indicating that the adaptive policy is ready to use
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  bool _old_gen_policy_is_ready;
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  // Changing the generation sizing depends on the data that is
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  // gathered about the effects of changes on the pause times and
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  // throughput.  These variable count the number of data points
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  // gathered.  The policy may use these counters as a threshold
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  // for reliable data.
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  julong _young_gen_change_for_major_pause_count;
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  // To facilitate faster growth at start up, supplement the normal
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  // growth percentage for the young gen eden and the
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  // old gen space for promotion with these value which decay
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  // with increasing collections.
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  uint _young_gen_size_increment_supplement;
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  uint _old_gen_size_increment_supplement;
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  // The number of bytes absorbed from eden into the old gen by moving the
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  // boundary over live data.
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  size_t _bytes_absorbed_from_eden;
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  // Accessors
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  AdaptivePaddedAverage* avg_major_pause() const { return _avg_major_pause; }
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  double gc_minor_pause_goal_sec() const { return _gc_minor_pause_goal_sec; }
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  void adjust_eden_for_minor_pause_time(bool is_full_gc,
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                                   size_t* desired_eden_size_ptr);
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  // Change the generation sizes to achieve a GC pause time goal
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  // Returned sizes are not necessarily aligned.
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  void adjust_promo_for_pause_time(bool is_full_gc,
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                         size_t* desired_promo_size_ptr,
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                         size_t* desired_eden_size_ptr);
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  void adjust_eden_for_pause_time(bool is_full_gc,
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                         size_t* desired_promo_size_ptr,
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                         size_t* desired_eden_size_ptr);
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  // Change the generation sizes to achieve an application throughput goal
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  // Returned sizes are not necessarily aligned.
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  void adjust_promo_for_throughput(bool is_full_gc,
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                             size_t* desired_promo_size_ptr);
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  void adjust_eden_for_throughput(bool is_full_gc,
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                             size_t* desired_eden_size_ptr);
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  // Change the generation sizes to achieve minimum footprint
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  // Returned sizes are not aligned.
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  size_t adjust_promo_for_footprint(size_t desired_promo_size,
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                                    size_t desired_total);
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  size_t adjust_eden_for_footprint(size_t desired_promo_size,
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                                   size_t desired_total);
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  // Size in bytes for an increment or decrement of eden.
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  virtual size_t eden_increment(size_t cur_eden, uint percent_change);
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  virtual size_t eden_decrement(size_t cur_eden);
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  size_t eden_decrement_aligned_down(size_t cur_eden);
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  size_t eden_increment_with_supplement_aligned_up(size_t cur_eden);
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  // Size in bytes for an increment or decrement of the promotion area
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  virtual size_t promo_increment(size_t cur_promo, uint percent_change);
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  virtual size_t promo_decrement(size_t cur_promo);
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  size_t promo_decrement_aligned_down(size_t cur_promo);
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  size_t promo_increment_with_supplement_aligned_up(size_t cur_promo);
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  // Returns a change that has been scaled down.  Result
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  // is not aligned.  (If useful, move to some shared
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  // location.)
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  size_t scale_down(size_t change, double part, double total);
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 protected:
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  // Time accessors
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  // Footprint accessors
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  size_t live_space() const {
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    return (size_t)(avg_base_footprint()->average() +
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                    avg_young_live()->average() +
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                    avg_old_live()->average());
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  }
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  size_t free_space() const {
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    return _eden_size + _promo_size;
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  }
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  void set_promo_size(size_t new_size) {
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    _promo_size = new_size;
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  }
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  void set_survivor_size(size_t new_size) {
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    _survivor_size = new_size;
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  }
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  // Update estimators
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  void update_minor_pause_old_estimator(double minor_pause_in_ms);
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  virtual GCPolicyKind kind() const { return _gc_ps_adaptive_size_policy; }
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 public:
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  // Use by ASPSYoungGen and ASPSOldGen to limit boundary moving.
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  size_t eden_increment_aligned_up(size_t cur_eden);
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  size_t eden_increment_aligned_down(size_t cur_eden);
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  size_t promo_increment_aligned_up(size_t cur_promo);
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  size_t promo_increment_aligned_down(size_t cur_promo);
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  virtual size_t eden_increment(size_t cur_eden);
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  virtual size_t promo_increment(size_t cur_promo);
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  // Accessors for use by performance counters
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  AdaptivePaddedNoZeroDevAverage*  avg_promoted() const {
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    return _gc_stats.avg_promoted();
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  }
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  AdaptiveWeightedAverage* avg_base_footprint() const {
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    return _avg_base_footprint;
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  }
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  // Input arguments are initial free space sizes for young and old
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  // generations, the initial survivor space size, the
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  // alignment values and the pause & throughput goals.
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  //
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  // NEEDS_CLEANUP this is a singleton object
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  PSAdaptiveSizePolicy(size_t init_eden_size,
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                       size_t init_promo_size,
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                       size_t init_survivor_size,
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                       size_t space_alignment,
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                       double gc_pause_goal_sec,
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                       double gc_minor_pause_goal_sec,
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                       uint gc_time_ratio);
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  // Methods indicating events of interest to the adaptive size policy,
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  // called by GC algorithms. It is the responsibility of users of this
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  // policy to call these methods at the correct times!
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  void major_collection_begin();
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  void major_collection_end(size_t amount_live, GCCause::Cause gc_cause);
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  void tenured_allocation(size_t size) {
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    _avg_pretenured->sample(size);
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  }
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  // Accessors
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  // NEEDS_CLEANUP   should use sizes.hpp
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  static size_t calculate_free_based_on_live(size_t live, uintx ratio_as_percentage);
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  size_t calculated_old_free_size_in_bytes() const;
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  size_t average_old_live_in_bytes() const {
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    return (size_t) avg_old_live()->average();
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  }
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  size_t average_promoted_in_bytes() const {
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    return (size_t)avg_promoted()->average();
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  }
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  size_t padded_average_promoted_in_bytes() const {
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    return (size_t)avg_promoted()->padded_average();
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  }
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  int change_young_gen_for_maj_pauses() {
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    return _change_young_gen_for_maj_pauses;
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  }
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  void set_change_young_gen_for_maj_pauses(int v) {
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    _change_young_gen_for_maj_pauses = v;
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  }
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  int change_old_gen_for_min_pauses() {
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    return _change_old_gen_for_min_pauses;
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  }
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  void set_change_old_gen_for_min_pauses(int v) {
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    _change_old_gen_for_min_pauses = v;
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  }
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  // Return true if the old generation size was changed
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  // to try to reach a pause time goal.
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  bool old_gen_changed_for_pauses() {
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    bool result = _change_old_gen_for_maj_pauses != 0 ||
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                  _change_old_gen_for_min_pauses != 0;
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    return result;
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  }
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  // Return true if the young generation size was changed
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  // to try to reach a pause time goal.
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  bool young_gen_changed_for_pauses() {
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    bool result = _change_young_gen_for_min_pauses != 0 ||
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                  _change_young_gen_for_maj_pauses != 0;
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    return result;
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  }
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  // end flags for pause goal
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  // Return true if the old generation size was changed
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  // to try to reach a throughput goal.
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  bool old_gen_changed_for_throughput() {
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    bool result = _change_old_gen_for_throughput != 0;
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    return result;
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  }
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  // Return true if the young generation size was changed
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  // to try to reach a throughput goal.
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  bool young_gen_changed_for_throughput() {
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    bool result = _change_young_gen_for_throughput != 0;
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    return result;
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  }
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  int decrease_for_footprint() { return _decrease_for_footprint; }
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  // Accessors for estimators.  The slope of the linear fit is
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  // currently all that is used for making decisions.
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  LinearLeastSquareFit* major_pause_old_estimator() {
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    return _major_pause_old_estimator;
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  }
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  LinearLeastSquareFit* major_pause_young_estimator() {
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    return _major_pause_young_estimator;
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  }
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  virtual void clear_generation_free_space_flags();
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  float major_pause_old_slope() { return _major_pause_old_estimator->slope(); }
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  float major_pause_young_slope() {
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    return _major_pause_young_estimator->slope();
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  }
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  float major_collection_slope() { return _major_collection_estimator->slope();}
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  bool old_gen_policy_is_ready() { return _old_gen_policy_is_ready; }
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  // Given the amount of live data in the heap, should we
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  // perform a Full GC?
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  bool should_full_GC(size_t live_in_old_gen);
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  // Calculates optimal (free) space sizes for both the young and old
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  // generations.  Stores results in _eden_size and _promo_size.
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  // Takes current used space in all generations as input, as well
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  // as an indication if a full gc has just been performed, for use
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  // in deciding if an OOM error should be thrown.
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  void compute_generations_free_space(size_t young_live,
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                                      size_t eden_live,
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                                      size_t old_live,
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                                      size_t cur_eden,  // current eden in bytes
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                                      size_t max_old_gen_size,
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                                      size_t max_eden_size,
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                                      bool   is_full_gc);
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  void compute_eden_space_size(size_t young_live,
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                               size_t eden_live,
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                               size_t cur_eden,  // current eden in bytes
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                               size_t max_eden_size,
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                               bool   is_full_gc);
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  void compute_old_gen_free_space(size_t old_live,
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                                             size_t cur_eden,  // current eden in bytes
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                                             size_t max_old_gen_size,
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                                             bool   is_full_gc);
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  // Calculates new survivor space size;  returns a new tenuring threshold
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  // value. Stores new survivor size in _survivor_size.
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  uint compute_survivor_space_size_and_threshold(bool   is_survivor_overflow,
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                                                 uint    tenuring_threshold,
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                                                 size_t survivor_limit);
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  // Return the maximum size of a survivor space if the young generation were of
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  // size gen_size.
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  size_t max_survivor_size(size_t gen_size) {
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    // Never allow the target survivor size to grow more than MinSurvivorRatio
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    // of the young generation size.  We cannot grow into a two semi-space
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    // system, with Eden zero sized.  Even if the survivor space grows, from()
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    // might grow by moving the bottom boundary "down" -- so from space will
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    // remain almost full anyway (top() will be near end(), but there will be a
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    // large filler object at the bottom).
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    const size_t sz = gen_size / MinSurvivorRatio;
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    const size_t alignment = _space_alignment;
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    return sz > alignment ? align_down(sz, alignment) : alignment;
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  }
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  size_t live_at_last_full_gc() {
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    return _live_at_last_full_gc;
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  }
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  size_t bytes_absorbed_from_eden() const { return _bytes_absorbed_from_eden; }
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  void   reset_bytes_absorbed_from_eden() { _bytes_absorbed_from_eden = 0; }
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  void set_bytes_absorbed_from_eden(size_t val) {
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    _bytes_absorbed_from_eden = val;
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  }
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  // Update averages that are always used (even
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  // if adaptive sizing is turned off).
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  void update_averages(bool is_survivor_overflow,
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                       size_t survived,
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                       size_t promoted);
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  // Printing support
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  virtual bool print() const;
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  // Decay the supplemental growth additive.
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  void decay_supplemental_growth(bool is_full_gc);
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};
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#endif // SHARE_VM_GC_PARALLEL_PSADAPTIVESIZEPOLICY_HPP