1 /*
 2  * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  *
23  */
24 
25 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHGENERATIONALEVACUATIONTASK_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHGENERATIONALEVACUATIONTASK_HPP
27 
28 #include "gc/shared/workerThread.hpp"
29 
30 class ShenandoahGenerationalHeap;
31 class ShenandoahHeapRegion;
32 class ShenandoahRegionIterator;
33 
34 // Unlike ShenandoahEvacuationTask, this iterates over all regions rather than just the collection set.
35 // This is needed in order to promote humongous start regions if age() >= tenure threshold.
36 class ShenandoahGenerationalEvacuationTask : public WorkerTask {
37 private:
38   ShenandoahGenerationalHeap* const _heap;
39   ShenandoahRegionIterator* _regions;
40   bool _concurrent;
41   bool _only_promote_regions;
42 
43 public:
44   ShenandoahGenerationalEvacuationTask(ShenandoahGenerationalHeap* sh,
45                                        ShenandoahRegionIterator* iterator,
46                                        bool concurrent, bool only_promote_regions);
47   void work(uint worker_id) override;
48 private:
49   void do_work();
50   void promote_regions();
51   void evacuate_and_promote_regions();
52   void maybe_promote_region(ShenandoahHeapRegion* region);
53   void promote_in_place(ShenandoahHeapRegion* region);
54   void promote_humongous(ShenandoahHeapRegion* region);
55 };
56 
57 #endif //SHARE_GC_SHENANDOAH_SHENANDOAHGENERATIONALEVACUATIONTASK_HPP