1 /*
2 * Copyright (c) 2018, 2019, 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 #ifndef SHARE_GC_SHARED_WEAKPROCESSOR_INLINE_HPP
26 #define SHARE_GC_SHARED_WEAKPROCESSOR_INLINE_HPP
27
28 #include "classfile/stringTable.hpp"
29 #include "gc/shared/oopStorage.inline.hpp"
30 #include "gc/shared/oopStorageParState.inline.hpp"
31 #include "gc/shared/weakProcessor.hpp"
32 #include "gc/shared/weakProcessorPhases.hpp"
33 #include "gc/shared/weakProcessorPhaseTimes.hpp"
34 #include "gc/shared/workgroup.hpp"
35 #include "utilities/debug.hpp"
36
37 class BoolObjectClosure;
38 class OopClosure;
39
40 template<typename IsAlive>
41 class CountingIsAliveClosure : public BoolObjectClosure {
42 IsAlive* _inner;
43
44 size_t _num_dead;
45 size_t _num_total;
46
47 public:
48 CountingIsAliveClosure(IsAlive* cl) : _inner(cl), _num_dead(0), _num_total(0) { }
49
50 virtual bool do_object_b(oop obj) {
51 bool result = _inner->do_object_b(obj);
52 _num_dead += !result;
53 _num_total++;
54 return result;
55 }
56
57 size_t num_dead() const { return _num_dead; }
58 size_t num_total() const { return _num_total; }
59 };
60
61 template <typename IsAlive, typename KeepAlive>
62 class CountingSkippedIsAliveClosure : public Closure {
63 CountingIsAliveClosure<IsAlive> _counting_is_alive;
64 KeepAlive* _keep_alive;
65
66 size_t _num_skipped;
67
68 public:
69 CountingSkippedIsAliveClosure(IsAlive* is_alive, KeepAlive* keep_alive) :
70 _counting_is_alive(is_alive), _keep_alive(keep_alive), _num_skipped(0) { }
71
72 void do_oop(oop* p) {
73 oop obj = *p;
74 if (obj == NULL) {
75 _num_skipped++;
76 return;
77 }
78 if (_counting_is_alive.do_object_b(obj)) {
79 _keep_alive->do_oop(p);
80 } else {
81 *p = NULL;
82 }
83 }
84
85 size_t num_dead() const { return _counting_is_alive.num_dead(); }
86 size_t num_skipped() const { return _num_skipped; }
87 size_t num_total() const { return _counting_is_alive.num_total() + num_skipped(); }
88 };
89
90 template<typename IsAlive, typename KeepAlive>
91 void WeakProcessor::Task::work(uint worker_id,
92 IsAlive* is_alive,
93 KeepAlive* keep_alive) {
94 assert(worker_id < _nworkers,
95 "worker_id (%u) exceeds task's configured workers (%u)",
96 worker_id, _nworkers);
97
98 FOR_EACH_WEAK_PROCESSOR_PHASE(phase) {
99 if (WeakProcessorPhases::is_serial(phase)) {
100 CountingIsAliveClosure<IsAlive> cl(is_alive);
101 uint serial_index = WeakProcessorPhases::serial_index(phase);
102 if (_serial_phases_done.try_claim_task(serial_index)) {
103 WeakProcessorPhaseTimeTracker pt(_phase_times, phase);
104 WeakProcessorPhases::processor(phase)(&cl, keep_alive);
105 if (_phase_times != NULL) {
106 _phase_times->record_phase_items(phase, cl.num_dead(), cl.num_total());
107 }
108 }
109 } else {
110 CountingSkippedIsAliveClosure<IsAlive, KeepAlive> cl(is_alive, keep_alive);
111 WeakProcessorPhaseTimeTracker pt(_phase_times, phase, worker_id);
112 uint storage_index = WeakProcessorPhases::oop_storage_index(phase);
113 _storage_states[storage_index].oops_do(&cl);
114 if (_phase_times != NULL) {
115 _phase_times->record_worker_items(worker_id, phase, cl.num_dead(), cl.num_total());
116 }
117 if (WeakProcessorPhases::is_stringtable(phase)) {
118 StringTable::inc_dead_counter(cl.num_dead() + cl.num_skipped());
119 }
120 }
121 }
122
123 _serial_phases_done.all_tasks_completed(_nworkers);
124 }
125
126 class WeakProcessor::GangTask : public AbstractGangTask {
127 Task _task;
128 BoolObjectClosure* _is_alive;
129 OopClosure* _keep_alive;
130 void (*_erased_do_work)(GangTask* task, uint worker_id);
131
132 template<typename IsAlive, typename KeepAlive>
133 static void erased_do_work(GangTask* task, uint worker_id) {
134 task->_task.work(worker_id,
135 static_cast<IsAlive*>(task->_is_alive),
136 static_cast<KeepAlive*>(task->_keep_alive));
137 }
138
139 public:
140 template<typename IsAlive, typename KeepAlive>
141 GangTask(const char* name,
142 IsAlive* is_alive,
143 KeepAlive* keep_alive,
144 WeakProcessorPhaseTimes* phase_times,
145 uint nworkers) :
146 AbstractGangTask(name),
147 _task(phase_times, nworkers),
148 _is_alive(is_alive),
149 _keep_alive(keep_alive),
150 _erased_do_work(&erased_do_work<IsAlive, KeepAlive>)
151 {}
152
153 virtual void work(uint worker_id);
154 };
155
156 template<typename IsAlive, typename KeepAlive>
157 void WeakProcessor::weak_oops_do(WorkGang* workers,
158 IsAlive* is_alive,
159 KeepAlive* keep_alive,
160 WeakProcessorPhaseTimes* phase_times) {
161 WeakProcessorTimeTracker tt(phase_times);
162
163 uint nworkers = ergo_workers(MIN2(workers->active_workers(),
164 phase_times->max_threads()));
165
166 GangTask task("Weak Processor", is_alive, keep_alive, phase_times, nworkers);
167 workers->run_task(&task, nworkers);
168 }
169
170 template<typename IsAlive, typename KeepAlive>
171 void WeakProcessor::weak_oops_do(WorkGang* workers,
172 IsAlive* is_alive,
173 KeepAlive* keep_alive,
174 uint indent_log) {
175 uint nworkers = ergo_workers(workers->active_workers());
176 WeakProcessorPhaseTimes pt(nworkers);
177 weak_oops_do(workers, is_alive, keep_alive, &pt);
178 pt.log_print_phases(indent_log);
179 }
180
181 #endif // SHARE_GC_SHARED_WEAKPROCESSOR_INLINE_HPP