zDirector.hpp

/*
 * Copyright (c) 2015, 2020, 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.
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#ifndef SHARE_GC_Z_ZDIRECTOR_HPP
#define SHARE_GC_Z_ZDIRECTOR_HPP

#include "gc/shared/concurrentGCThread.hpp"
#include "gc/shared/gcCause.hpp"
#include "gc/z/zMetronome.hpp"

class ZDirector : public ConcurrentGCThread {
private:
  static const double one_in_1000;

  const size_t _relocation_headroom;
  ZMetronome   _metronome;

  void sample_allocation_rate() const;

  bool rule_timer() const;
  bool rule_warmup() const;
  bool rule_allocation_rate() const;
  bool rule_proactive() const;
  bool rule_high_usage() const;
  GCCause::Cause make_gc_decision() const;

protected:
  virtual void run_service();
  virtual void stop_service();

public:
  ZDirector();
};

#endif // SHARE_GC_Z_ZDIRECTOR_HPP