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/shenandoah/shenandoahHeuristics.hpp"

    28 #include "gc/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