1 /*
2 * Copyright (c) 2017, 2023, Oracle and/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 #include "precompiled.hpp"
26 #include "gc/g1/g1CollectedHeap.inline.hpp"
27 #include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp"
28 #include "gc/g1/g1FullCollector.inline.hpp"
29 #include "gc/g1/g1FullGCCompactionPoint.hpp"
30 #include "gc/g1/g1FullGCMarker.hpp"
31 #include "gc/g1/g1FullGCOopClosures.inline.hpp"
32 #include "gc/g1/g1FullGCPrepareTask.inline.hpp"
33 #include "gc/g1/heapRegion.inline.hpp"
34 #include "gc/shared/gcTraceTime.inline.hpp"
35 #include "gc/shared/referenceProcessor.hpp"
36 #include "logging/log.hpp"
37 #include "memory/iterator.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "utilities/ticks.hpp"
40
41 G1DetermineCompactionQueueClosure::G1DetermineCompactionQueueClosure(G1FullCollector* collector) :
42 _g1h(G1CollectedHeap::heap()),
43 _collector(collector),
44 _cur_worker(0) { }
45
46 bool G1FullGCPrepareTask::G1CalculatePointersClosure::do_heap_region(HeapRegion* hr) {
47 uint region_idx = hr->hrm_index();
48 assert(_collector->is_compaction_target(region_idx), "must be");
49
50 assert(!hr->is_humongous(), "must be");
51
52 prepare_for_compaction(hr);
53
54 return false;
55 }
56
57 G1FullGCPrepareTask::G1FullGCPrepareTask(G1FullCollector* collector) :
58 G1FullGCTask("G1 Prepare Compact Task", collector),
59 _has_free_compaction_targets(false),
60 _hrclaimer(collector->workers()) {
61 }
62
63 void G1FullGCPrepareTask::set_has_free_compaction_targets() {
64 if (!_has_free_compaction_targets) {
65 _has_free_compaction_targets = true;
66 }
67 }
68
69 bool G1FullGCPrepareTask::has_free_compaction_targets() {
70 return _has_free_compaction_targets;
71 }
72
73 void G1FullGCPrepareTask::work(uint worker_id) {
74 Ticks start = Ticks::now();
75 // Calculate the target locations for the objects in the non-free regions of
76 // the compaction queues provided by the associate compaction point.
77 {
78 G1FullGCCompactionPoint* compaction_point = collector()->compaction_point(worker_id);
79 G1CalculatePointersClosure closure(collector(), compaction_point);
80
81 for (GrowableArrayIterator<HeapRegion*> it = compaction_point->regions()->begin();
82 it != compaction_point->regions()->end();
83 ++it) {
84 closure.do_heap_region(*it);
85 }
86 compaction_point->update();
87 // Determine if there are any unused compaction targets. This is only the case if
88 // there are
89 // - any regions in queue, so no free ones either.
90 // - and the current region is not the last one in the list.
91 if (compaction_point->has_regions() &&
92 compaction_point->current_region() != compaction_point->regions()->last()) {
93 set_has_free_compaction_targets();
94 }
95 }
96 log_task("Prepare compaction task", worker_id, start);
97 }
98
99 G1FullGCPrepareTask::G1CalculatePointersClosure::G1CalculatePointersClosure(G1FullCollector* collector,
100 G1FullGCCompactionPoint* cp) :
101 _g1h(G1CollectedHeap::heap()),
102 _collector(collector),
103 _bitmap(collector->mark_bitmap()),
104 _cp(cp) { }
105
106
107 template <bool ALT_FWD>
108 G1FullGCPrepareTask::G1PrepareCompactLiveClosure<ALT_FWD>::G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp) :
109 _cp(cp) { }
110
111 template <bool ALT_FWD>
112 size_t G1FullGCPrepareTask::G1PrepareCompactLiveClosure<ALT_FWD>::apply(oop object) {
113 size_t size = object->size();
114 _cp->forward<ALT_FWD>(object, size);
115 return size;
116 }
117
118 void G1FullGCPrepareTask::G1CalculatePointersClosure::prepare_for_compaction(HeapRegion* hr) {
119 if (!_collector->is_free(hr->hrm_index())) {
120 if (UseAltGCForwarding) {
121 G1PrepareCompactLiveClosure<true> prepare_compact(_cp);
122 hr->apply_to_marked_objects(_bitmap, &prepare_compact);
123 } else {
124 G1PrepareCompactLiveClosure<false> prepare_compact(_cp);
125 hr->apply_to_marked_objects(_bitmap, &prepare_compact);
126 }
127 }
128 }