src/hotspot/share/gc/shenandoah/heuristics/shenandoahStaticHeuristics.hpp

/*
 * Copyright (c) 2018, 2019, Red Hat, Inc. 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
 * or visit www.oracle.com if you need additional information or have any
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#ifndef SHARE_GC_SHENANDOAH_HEURISTICS_SHENANDOAHSTATICHEURISTICS_HPP
#define SHARE_GC_SHENANDOAH_HEURISTICS_SHENANDOAHSTATICHEURISTICS_HPP

#include "gc/shenandoah/heuristics/shenandoahHeuristics.hpp"

/*
 * The static heuristic will trigger cycles if the available memory falls
 * below ShenandoahMinFreeThreshold percentage of total capacity. This
 * heuristic will attempt to evacuation any region with any garbage.
 */
class ShenandoahStaticHeuristics : public ShenandoahHeuristics {
public:
  ShenandoahStaticHeuristics(ShenandoahSpaceInfo* space_info);

  virtual ~ShenandoahStaticHeuristics();

  virtual bool should_start_gc();

  virtual void choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
                                                     RegionData* data, size_t size,
                                                     size_t free);

  virtual const char* name()     { return "Static"; }
  virtual bool is_diagnostic()   { return false; }
  virtual bool is_experimental() { return false; }
};

#endif // SHARE_GC_SHENANDOAH_HEURISTICS_SHENANDOAHSTATICHEURISTICS_HPP