1 /*
2 * Copyright (c) 2022, 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.
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23 */
24
25 #ifndef SHARE_GC_G1_G1FULLGCPREPARETASK_INLINE_HPP
26 #define SHARE_GC_G1_G1FULLGCPREPARETASK_INLINE_HPP
27
28 #include "gc/g1/g1FullGCPrepareTask.hpp"
29
30 #include "gc/g1/g1CollectedHeap.inline.hpp"
31 #include "gc/g1/g1FullCollector.hpp"
32 #include "gc/g1/g1FullGCCompactionPoint.hpp"
33 #include "gc/g1/g1FullGCScope.hpp"
34 #include "gc/g1/heapRegion.inline.hpp"
35
36 template<bool is_humongous>
37 void G1DetermineCompactionQueueClosure::free_pinned_region(HeapRegion* hr) {
38 if (is_humongous) {
39 _g1h->free_humongous_region(hr, nullptr);
40 } else {
41 _g1h->free_region(hr, nullptr);
42 }
43 _collector->set_free(hr->hrm_index());
44 add_to_compaction_queue(hr);
45 }
46
47 inline bool G1DetermineCompactionQueueClosure::should_compact(HeapRegion* hr) const {
48 // There is no need to iterate and forward objects in pinned regions ie.
49 // prepare them for compaction.
50 if (hr->is_pinned()) {
51 return false;
52 }
53 size_t live_words = _collector->live_words(hr->hrm_index());
54 size_t live_words_threshold = _collector->scope()->region_compaction_threshold();
55 // High live ratio region will not be compacted.
56 return live_words <= live_words_threshold;
57 }
58
59 inline uint G1DetermineCompactionQueueClosure::next_worker() {
60 uint result = _cur_worker;
61 _cur_worker = (_cur_worker + 1) % _collector->workers();
62 return result;
63 }
64
65 inline G1FullGCCompactionPoint* G1DetermineCompactionQueueClosure::next_compaction_point() {
66 return _collector->compaction_point(next_worker());
67 }
68
69 inline void G1DetermineCompactionQueueClosure::add_to_compaction_queue(HeapRegion* hr) {
70 _collector->set_compaction_top(hr, hr->bottom());
71 _collector->set_has_compaction_targets();
72
73 G1FullGCCompactionPoint* cp = next_compaction_point();
74 if (!cp->is_initialized()) {
75 cp->initialize(hr);
76 }
77 // Add region to the compaction queue.
78 cp->add(hr);
79 }
80
81 inline bool G1DetermineCompactionQueueClosure::do_heap_region(HeapRegion* hr) {
82 if (should_compact(hr)) {
83 assert(!hr->is_humongous(), "moving humongous objects not supported.");
84 add_to_compaction_queue(hr);
85 } else {
86 assert(hr->containing_set() == nullptr, "already cleared by PrepareRegionsClosure");
87 if (hr->is_humongous()) {
88 oop obj = cast_to_oop(hr->humongous_start_region()->bottom());
89 bool is_empty = !_collector->mark_bitmap()->is_marked(obj);
90 if (is_empty) {
91 free_pinned_region<true>(hr);
92 }
93 } else if (hr->is_open_archive()) {
94 bool is_empty = _collector->live_words(hr->hrm_index()) == 0;
95 if (is_empty) {
96 free_pinned_region<false>(hr);
97 }
98 } else if (hr->is_closed_archive()) {
99 // nothing to do with closed archive region
100 } else {
101 assert(MarkSweepDeadRatio > 0,
102 "only skip compaction for other regions when MarkSweepDeadRatio > 0");
103
104 // Too many live objects in the region; skip compacting it.
105 _collector->update_from_compacting_to_skip_compacting(hr->hrm_index());
106 log_trace(gc, phases)("Phase 2: skip compaction region index: %u, live words: " SIZE_FORMAT,
107 hr->hrm_index(), _collector->live_words(hr->hrm_index()));
108 }
109 }
110
111 return false;
112 }
113
114 inline size_t G1SerialRePrepareClosure::apply(oop obj) {
115 if (obj->is_forwarded()) {
116 // We skip objects compiled into the first region or
117 // into regions not part of the serial compaction point.
118 if (cast_from_oop<HeapWord*>(obj->forwardee()) < _dense_prefix_top) {
119 return obj->size();
120 }
121 }
122
123 // Get size and forward.
124 size_t size = obj->size();
125 _cp->forward(obj, size);
126
127 return size;
128 }
129
130 #endif // SHARE_GC_G1_G1FULLGCPREPARETASK_INLINE_HPP