1 /*
2 * Copyright (c) 2015, 2019, Red Hat, Inc. All rights reserved.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #include "precompiled.hpp"
25
26 #include "classfile/classLoaderDataGraph.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "code/codeCache.hpp"
30 #include "gc/shenandoah/shenandoahRootProcessor.inline.hpp"
31 #include "gc/shenandoah/shenandoahHeap.hpp"
32 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
33 #include "gc/shenandoah/shenandoahStringDedup.hpp"
34 #include "gc/shenandoah/shenandoahTimingTracker.hpp"
35 #include "gc/shenandoah/shenandoahVMOperations.hpp"
36 #include "jfr/jfr.hpp"
37 #include "memory/iterator.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "memory/universe.hpp"
40 #include "runtime/thread.hpp"
41 #include "services/management.hpp"
42
43 ShenandoahSerialRoot::ShenandoahSerialRoot(ShenandoahSerialRoot::OopsDo oops_do, ShenandoahPhaseTimings::GCParPhases phase) :
44 _claimed(false), _oops_do(oops_do), _phase(phase) {
45 }
46
47 void ShenandoahSerialRoot::oops_do(OopClosure* cl, uint worker_id) {
48 if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
49 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
50 ShenandoahWorkerTimingsTracker timer(worker_times, _phase, worker_id);
51 _oops_do(cl);
52 }
53 }
54
55 ShenandoahSerialRoots::ShenandoahSerialRoots() :
56 _universe_root(&Universe::oops_do, ShenandoahPhaseTimings::UniverseRoots),
57 _object_synchronizer_root(&ObjectSynchronizer::oops_do, ShenandoahPhaseTimings::ObjectSynchronizerRoots),
58 _management_root(&Management::oops_do, ShenandoahPhaseTimings::ManagementRoots),
59 _system_dictionary_root(&SystemDictionary::oops_do, ShenandoahPhaseTimings::SystemDictionaryRoots),
60 _jvmti_root(&JvmtiExport::oops_do, ShenandoahPhaseTimings::JVMTIRoots) {
61 }
62
63 void ShenandoahSerialRoots::oops_do(OopClosure* cl, uint worker_id) {
64 _universe_root.oops_do(cl, worker_id);
65 _object_synchronizer_root.oops_do(cl, worker_id);
66 _management_root.oops_do(cl, worker_id);
67 _system_dictionary_root.oops_do(cl, worker_id);
68 _jvmti_root.oops_do(cl, worker_id);
69 }
70
71 ShenandoahWeakSerialRoot::ShenandoahWeakSerialRoot(ShenandoahWeakSerialRoot::WeakOopsDo weak_oops_do, ShenandoahPhaseTimings::GCParPhases phase) :
72 _weak_oops_do(weak_oops_do), _phase(phase) {
73 }
74
75 void ShenandoahWeakSerialRoot::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {
76 if (_claimed.try_set()) {
77 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
78 ShenandoahWorkerTimingsTracker timer(worker_times, _phase, worker_id);
79 _weak_oops_do(is_alive, keep_alive);
80 }
81 }
82
83 #if INCLUDE_JVMTI
84 ShenandoahJVMTIWeakRoot::ShenandoahJVMTIWeakRoot() :
85 ShenandoahWeakSerialRoot(&JvmtiExport::weak_oops_do, ShenandoahPhaseTimings::JVMTIWeakRoots) {
86 }
87 #endif // INCLUDE_JVMTI
88
89 #if INCLUDE_JFR
90 ShenandoahJFRWeakRoot::ShenandoahJFRWeakRoot() :
91 ShenandoahWeakSerialRoot(&Jfr::weak_oops_do, ShenandoahPhaseTimings::JFRWeakRoots) {
92 }
93 #endif // INCLUDE_JFR
94
95 void ShenandoahSerialWeakRoots::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {
96 JVMTI_ONLY(_jvmti_weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);)
97 JFR_ONLY(_jfr_weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);)
98 }
99
100 void ShenandoahSerialWeakRoots::weak_oops_do(OopClosure* cl, uint worker_id) {
101 AlwaysTrueClosure always_true;
102 weak_oops_do(&always_true, cl, worker_id);
103 }
104
105 ShenandoahThreadRoots::ShenandoahThreadRoots(bool is_par) : _is_par(is_par) {
106 Threads::change_thread_claim_token();
107 }
108
109 void ShenandoahThreadRoots::oops_do(OopClosure* oops_cl, CodeBlobClosure* code_cl, uint worker_id) {
110 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
111 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::ThreadRoots, worker_id);
112 ResourceMark rm;
113 Threads::possibly_parallel_oops_do(_is_par, oops_cl, code_cl);
114 }
115
116 void ShenandoahThreadRoots::threads_do(ThreadClosure* tc, uint worker_id) {
117 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
118 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::ThreadRoots, worker_id);
119 ResourceMark rm;
120 Threads::possibly_parallel_threads_do(_is_par, tc);
121 }
122
123 ShenandoahThreadRoots::~ShenandoahThreadRoots() {
124 Threads::assert_all_threads_claimed();
125 }
126
127 ShenandoahStringDedupRoots::ShenandoahStringDedupRoots() {
128 if (ShenandoahStringDedup::is_enabled()) {
129 StringDedup::gc_prologue(false);
130 }
131 }
132
133 ShenandoahStringDedupRoots::~ShenandoahStringDedupRoots() {
134 if (ShenandoahStringDedup::is_enabled()) {
135 StringDedup::gc_epilogue();
136 }
137 }
138
139 void ShenandoahStringDedupRoots::oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {
140 if (ShenandoahStringDedup::is_enabled()) {
141 ShenandoahStringDedup::parallel_oops_do(is_alive, keep_alive, worker_id);
142 }
143 }
144
145 ShenandoahClassLoaderDataRoots::ShenandoahClassLoaderDataRoots() {
146 ClassLoaderDataGraph::clear_claimed_marks();
147 }
148
149 void ShenandoahClassLoaderDataRoots::clds_do(CLDClosure* strong_clds, CLDClosure* weak_clds, uint worker_id) {
150 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
151 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::CLDGRoots, worker_id);
152 ClassLoaderDataGraph::roots_cld_do(strong_clds, weak_clds);
153 }
154
155 ShenandoahRootProcessor::ShenandoahRootProcessor(ShenandoahPhaseTimings::Phase phase) :
156 _heap(ShenandoahHeap::heap()),
157 _phase(phase) {
158 assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint");
159 _heap->phase_timings()->record_workers_start(_phase);
160 }
161
162 ShenandoahRootProcessor::~ShenandoahRootProcessor() {
163 assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint");
164 _heap->phase_timings()->record_workers_end(_phase);
165 }
166
167 ShenandoahRootEvacuator::ShenandoahRootEvacuator(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool include_concurrent_roots) :
168 ShenandoahRootProcessor(phase),
169 _thread_roots(n_workers > 1),
170 _include_concurrent_roots(include_concurrent_roots) {
171 }
172
173 void ShenandoahRootEvacuator::roots_do(uint worker_id, OopClosure* oops) {
174 MarkingCodeBlobClosure blobsCl(oops, CodeBlobToOopClosure::FixRelocations);
175 CLDToOopClosure clds(oops, ClassLoaderData::_claim_strong);
176 AlwaysTrueClosure always_true;
177
178 _serial_roots.oops_do(oops, worker_id);
179 _serial_weak_roots.weak_oops_do(oops, worker_id);
180 if (_include_concurrent_roots) {
181 _jni_roots.oops_do<OopClosure>(oops, worker_id);
182 _weak_roots.oops_do<OopClosure>(oops, worker_id);
183 }
184
185 _thread_roots.oops_do(oops, NULL, worker_id);
186 _cld_roots.clds_do(&clds, &clds, worker_id);
187 _code_roots.code_blobs_do(&blobsCl, worker_id);
188
189 _dedup_roots.oops_do(&always_true, oops, worker_id);
190 }
191
192 ShenandoahRootUpdater::ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool update_code_cache) :
193 ShenandoahRootProcessor(phase),
194 _thread_roots(n_workers > 1),
195 _update_code_cache(update_code_cache) {
196 }
197
198 ShenandoahRootAdjuster::ShenandoahRootAdjuster(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
199 ShenandoahRootProcessor(phase),
200 _thread_roots(n_workers > 1) {
201 assert(ShenandoahHeap::heap()->is_full_gc_in_progress(), "Full GC only");
202 }
203
204 void ShenandoahRootAdjuster::roots_do(uint worker_id, OopClosure* oops) {
205 CodeBlobToOopClosure adjust_code_closure(oops, CodeBlobToOopClosure::FixRelocations);
206 CLDToOopClosure adjust_cld_closure(oops, ClassLoaderData::_claim_strong);
207 AlwaysTrueClosure always_true;
208
209 _serial_roots.oops_do(oops, worker_id);
210 _jni_roots.oops_do(oops, worker_id);
211
212 _thread_roots.oops_do(oops, NULL, worker_id);
213 _cld_roots.clds_do(&adjust_cld_closure, NULL, worker_id);
214 _code_roots.code_blobs_do(&adjust_code_closure, worker_id);
215
216 _serial_weak_roots.weak_oops_do(oops, worker_id);
217 _weak_roots.oops_do<OopClosure>(oops, worker_id);
218 _dedup_roots.oops_do(&always_true, oops, worker_id);
219 }