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/shenandoahClosures.inline.hpp"
31 #include "gc/shenandoah/shenandoahRootProcessor.inline.hpp"
32 #include "gc/shenandoah/shenandoahHeap.hpp"
33 #include "gc/shenandoah/shenandoahHeuristics.hpp"
34 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
35 #include "gc/shenandoah/shenandoahStringDedup.hpp"
36 #include "gc/shenandoah/shenandoahTimingTracker.hpp"
37 #include "gc/shenandoah/shenandoahVMOperations.hpp"
38 #include "jfr/jfr.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/iterator.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.hpp"
43 #include "runtime/thread.hpp"
44 #include "services/management.hpp"
45
46 ShenandoahSerialRoot::ShenandoahSerialRoot(ShenandoahSerialRoot::OopsDo oops_do, ShenandoahPhaseTimings::GCParPhases phase) :
47 _claimed(false), _oops_do(oops_do), _phase(phase) {
48 }
49
50 void ShenandoahSerialRoot::oops_do(OopClosure* cl, uint worker_id) {
51 if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
52 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
53 ShenandoahWorkerTimingsTracker timer(worker_times, _phase, worker_id);
54 _oops_do(cl);
55 }
56 }
57
58 ShenandoahSerialRoots::ShenandoahSerialRoots() :
59 _universe_root(&Universe::oops_do, ShenandoahPhaseTimings::UniverseRoots),
60 _object_synchronizer_root(&ObjectSynchronizer::oops_do, ShenandoahPhaseTimings::ObjectSynchronizerRoots),
61 _management_root(&Management::oops_do, ShenandoahPhaseTimings::ManagementRoots),
62 _system_dictionary_root(&SystemDictionary::oops_do, ShenandoahPhaseTimings::SystemDictionaryRoots),
63 _jvmti_root(&JvmtiExport::oops_do, ShenandoahPhaseTimings::JVMTIRoots) {
64 }
65
66 void ShenandoahSerialRoots::oops_do(OopClosure* cl, uint worker_id) {
67 _universe_root.oops_do(cl, worker_id);
68 _object_synchronizer_root.oops_do(cl, worker_id);
69 _management_root.oops_do(cl, worker_id);
70 _system_dictionary_root.oops_do(cl, worker_id);
71 _jvmti_root.oops_do(cl, worker_id);
72 }
73
74 ShenandoahWeakSerialRoot::ShenandoahWeakSerialRoot(ShenandoahWeakSerialRoot::WeakOopsDo weak_oops_do, ShenandoahPhaseTimings::GCParPhases phase) :
75 _claimed(false), _weak_oops_do(weak_oops_do), _phase(phase) {
76 }
77
78 void ShenandoahWeakSerialRoot::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {
79 if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
80 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
81 ShenandoahWorkerTimingsTracker timer(worker_times, _phase, worker_id);
82 _weak_oops_do(is_alive, keep_alive);
83 }
84 }
85
86 #if INCLUDE_JVMTI
87 ShenandoahJVMTIWeakRoot::ShenandoahJVMTIWeakRoot() :
88 ShenandoahWeakSerialRoot(&JvmtiExport::weak_oops_do, ShenandoahPhaseTimings::JVMTIWeakRoots) {
89 }
90 #endif // INCLUDE_JVMTI
91
92 #if INCLUDE_JFR
93 ShenandoahJFRWeakRoot::ShenandoahJFRWeakRoot() :
94 ShenandoahWeakSerialRoot(&Jfr::weak_oops_do, ShenandoahPhaseTimings::JFRWeakRoots) {
95 }
96 #endif // INCLUDE_JFR
97
98 void ShenandoahSerialWeakRoots::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {
99 JVMTI_ONLY(_jvmti_weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);)
100 JFR_ONLY(_jfr_weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);)
101 }
102
103 void ShenandoahSerialWeakRoots::weak_oops_do(OopClosure* cl, uint worker_id) {
104 AlwaysTrueClosure always_true;
105 weak_oops_do(&always_true, cl, worker_id);
106 }
107
108 ShenandoahThreadRoots::ShenandoahThreadRoots(bool is_par) : _is_par(is_par) {
109 Threads::change_thread_claim_token();
110 }
111
112 void ShenandoahThreadRoots::oops_do(OopClosure* oops_cl, CodeBlobClosure* code_cl, uint worker_id) {
113 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
114 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::ThreadRoots, worker_id);
115 ResourceMark rm;
116 Threads::possibly_parallel_oops_do(_is_par, oops_cl, code_cl);
117 }
118
119 void ShenandoahThreadRoots::threads_do(ThreadClosure* tc, uint worker_id) {
120 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
121 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::ThreadRoots, worker_id);
122 ResourceMark rm;
123 Threads::possibly_parallel_threads_do(_is_par, tc);
124 }
125
126 ShenandoahThreadRoots::~ShenandoahThreadRoots() {
127 Threads::assert_all_threads_claimed();
128 }
129
130 ShenandoahStringDedupRoots::ShenandoahStringDedupRoots() {
131 if (ShenandoahStringDedup::is_enabled()) {
132 StringDedup::gc_prologue(false);
133 }
134 }
135
136 ShenandoahStringDedupRoots::~ShenandoahStringDedupRoots() {
137 if (ShenandoahStringDedup::is_enabled()) {
138 StringDedup::gc_epilogue();
139 }
140 }
141
142 void ShenandoahStringDedupRoots::oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {
143 if (ShenandoahStringDedup::is_enabled()) {
144 ShenandoahStringDedup::parallel_oops_do(is_alive, keep_alive, worker_id);
145 }
146 }
147
148 ShenandoahClassLoaderDataRoots::ShenandoahClassLoaderDataRoots() {
149 ClassLoaderDataGraph::clear_claimed_marks();
150 }
151
152 void ShenandoahClassLoaderDataRoots::clds_do(CLDClosure* strong_clds, CLDClosure* weak_clds, uint worker_id) {
153 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
154 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::CLDGRoots, worker_id);
155 ClassLoaderDataGraph::roots_cld_do(strong_clds, weak_clds);
156 }
157
158 ShenandoahRootProcessor::ShenandoahRootProcessor(ShenandoahPhaseTimings::Phase phase) :
159 _heap(ShenandoahHeap::heap()),
160 _phase(phase) {
161 assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint");
162 _heap->phase_timings()->record_workers_start(_phase);
163 }
164
165 ShenandoahRootProcessor::~ShenandoahRootProcessor() {
166 assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint");
167 _heap->phase_timings()->record_workers_end(_phase);
168 }
169
170 ShenandoahRootEvacuator::ShenandoahRootEvacuator(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool include_concurrent_roots) :
171 ShenandoahRootProcessor(phase),
172 _thread_roots(n_workers > 1),
173 _include_concurrent_roots(include_concurrent_roots) {
174 }
175
176 void ShenandoahRootEvacuator::roots_do(uint worker_id, OopClosure* oops) {
177 MarkingCodeBlobClosure blobsCl(oops, CodeBlobToOopClosure::FixRelocations);
178 CLDToOopClosure clds(oops, ClassLoaderData::_claim_strong);
179 AlwaysTrueClosure always_true;
180
181 _serial_roots.oops_do(oops, worker_id);
182 _serial_weak_roots.weak_oops_do(oops, worker_id);
183 if (_include_concurrent_roots) {
184 _jni_roots.oops_do<OopClosure>(oops, worker_id);
185 _weak_roots.oops_do<OopClosure>(oops, worker_id);
186 }
187
188 _thread_roots.oops_do(oops, NULL, worker_id);
189 _cld_roots.clds_do(&clds, &clds, worker_id);
190 _code_roots.code_blobs_do(&blobsCl, worker_id);
191
192 _dedup_roots.oops_do(&always_true, oops, worker_id);
193 }
194
195 ShenandoahRootUpdater::ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool update_code_cache) :
196 ShenandoahRootProcessor(phase),
197 _thread_roots(n_workers > 1),
198 _update_code_cache(update_code_cache) {
199 }
200
201 ShenandoahRootAdjuster::ShenandoahRootAdjuster(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
202 ShenandoahRootProcessor(phase),
203 _thread_roots(n_workers > 1) {
204 assert(ShenandoahHeap::heap()->is_full_gc_in_progress(), "Full GC only");
205 }
206
207 void ShenandoahRootAdjuster::roots_do(uint worker_id, OopClosure* oops) {
208 CodeBlobToOopClosure adjust_code_closure(oops, CodeBlobToOopClosure::FixRelocations);
209 CLDToOopClosure adjust_cld_closure(oops, ClassLoaderData::_claim_strong);
210 AlwaysTrueClosure always_true;
211
212 _serial_roots.oops_do(oops, worker_id);
213 _jni_roots.oops_do(oops, worker_id);
214
215 _thread_roots.oops_do(oops, NULL, worker_id);
216 _cld_roots.clds_do(&adjust_cld_closure, NULL, worker_id);
217 _code_roots.code_blobs_do(&adjust_code_closure, worker_id);
218
219 _serial_weak_roots.weak_oops_do(oops, worker_id);
220 _weak_roots.oops_do<OopClosure>(oops, worker_id);
221 _dedup_roots.oops_do(&always_true, oops, worker_id);
222 }