1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #ifndef SHARE_VM_GC_SHENANDOAH_HEURISTICS_SHENANDOAHADAPTIVEHEURISTICS_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_HEURISTICS_SHENANDOAHADAPTIVEHEURISTICS_HPP
  26 
  27 #include "gc_implementation/shenandoah/shenandoahHeuristics.hpp"
  28 #include "gc_implementation/shenandoah/shenandoahPhaseTimings.hpp"
  29 #include "utilities/numberSeq.hpp"
  30 
  31 class ShenandoahAdaptiveHeuristics : public ShenandoahHeuristics {
  32 private:
  33   TruncatedSeq* _cycle_gap_history;
  34   TruncatedSeq* _conc_mark_duration_history;
  35   TruncatedSeq* _conc_uprefs_duration_history;
  36 
  37 public:
  38   ShenandoahAdaptiveHeuristics();
  39 
  40   virtual ~ShenandoahAdaptiveHeuristics();
  41 
  42   virtual void choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
  43                                                      RegionData* data, size_t size,
  44                                                      size_t actual_free);
  45 
  46   void record_cycle_start();
  47 
  48   virtual void record_phase_time(ShenandoahPhaseTimings::Phase phase, double secs);
  49 
  50   virtual bool should_start_normal_gc() const;
  51 
  52   virtual bool should_start_update_refs();
  53 
  54   virtual const char* name();
  55 
  56   virtual bool is_diagnostic();
  57 
  58   virtual bool is_experimental();
  59 };
  60 
  61 #endif // SHARE_VM_GC_SHENANDOAH_HEURISTICS_SHENANDOAHADAPTIVEHEURISTICS_HPP