1 /*
 2  * Copyright (c) 2018, 2019, Red Hat, Inc. All rights reserved.
 3  * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
 4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 5  *
 6  * This code is free software; you can redistribute it and/or modify it
 7  * under the terms of the GNU General Public License version 2 only, as
 8  * published by the Free Software Foundation.
 9  *
10  * This code is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13  * version 2 for more details (a copy is included in the LICENSE file that
14  * accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License version
17  * 2 along with this work; if not, write to the Free Software Foundation,
18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19  *
20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21  * or visit www.oracle.com if you need additional information or have any
22  * questions.
23  *
24  */
25 
26 #ifndef SHARE_GC_SHENANDOAH_HEURISTICS_SHENANDOAHAGGRESSIVEHEURISTICS_HPP
27 #define SHARE_GC_SHENANDOAH_HEURISTICS_SHENANDOAHAGGRESSIVEHEURISTICS_HPP
28 
29 #include "gc/shenandoah/heuristics/shenandoahHeuristics.hpp"
30 
31 /*
32  * This is a diagnostic heuristic that continuously runs collections
33  * cycles and adds every region with any garbage to the collection set.
34  */
35 class ShenandoahAggressiveHeuristics : public ShenandoahHeuristics {
36 public:
37   ShenandoahAggressiveHeuristics(ShenandoahSpaceInfo* space_info);
38 
39   virtual void choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
40                                                      RegionData* data, size_t size,
41                                                      size_t free);
42 
43   virtual bool should_start_gc();
44 
45   virtual bool should_unload_classes();
46 
47   virtual const char* name()     { return "Aggressive"; }
48   virtual bool is_diagnostic()   { return true; }
49   virtual bool is_experimental() { return false; }
50 };
51 
52 #endif // SHARE_GC_SHENANDOAH_HEURISTICS_SHENANDOAHAGGRESSIVEHEURISTICS_HPP