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 "gc/shared/weakProcessor.inline.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 ShenandoahJNIHandleRoots::ShenandoahJNIHandleRoots() :
75 ShenandoahSerialRoot(&JNIHandles::oops_do, ShenandoahPhaseTimings::JNIRoots) {
76 }
77
78 ShenandoahThreadRoots::ShenandoahThreadRoots(bool is_par) : _is_par(is_par) {
79 Threads::change_thread_claim_token();
80 }
81
82 void ShenandoahThreadRoots::oops_do(OopClosure* oops_cl, CodeBlobClosure* code_cl, uint worker_id) {
83 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
84 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::ThreadRoots, worker_id);
85 ResourceMark rm;
86 Threads::possibly_parallel_oops_do(_is_par, oops_cl, code_cl);
87 }
88
89 void ShenandoahThreadRoots::threads_do(ThreadClosure* tc, uint worker_id) {
90 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
91 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::ThreadRoots, worker_id);
92 ResourceMark rm;
93 Threads::possibly_parallel_threads_do(_is_par, tc);
94 }
95
96 ShenandoahThreadRoots::~ShenandoahThreadRoots() {
97 Threads::assert_all_threads_claimed();
98 }
99
100 ShenandoahWeakRoots::ShenandoahWeakRoots(uint n_workers) :
101 _process_timings(n_workers),
102 _task(&_process_timings, n_workers) {
103 }
104
105 ShenandoahWeakRoots::~ShenandoahWeakRoots() {
106 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
107 ShenandoahTimingConverter::weak_processing_timing_to_shenandoah_timing(&_process_timings,
108 worker_times);
109 }
110
111 ShenandoahStringDedupRoots::ShenandoahStringDedupRoots() {
112 if (ShenandoahStringDedup::is_enabled()) {
113 StringDedup::gc_prologue(false);
114 }
115 }
116
117 ShenandoahStringDedupRoots::~ShenandoahStringDedupRoots() {
118 if (ShenandoahStringDedup::is_enabled()) {
119 StringDedup::gc_epilogue();
120 }
121 }
122
123 void ShenandoahStringDedupRoots::oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {
124 if (ShenandoahStringDedup::is_enabled()) {
125 ShenandoahStringDedup::parallel_oops_do(is_alive, keep_alive, worker_id);
126 }
127 }
128
129 ShenandoahClassLoaderDataRoots::ShenandoahClassLoaderDataRoots() {
130 ClassLoaderDataGraph::clear_claimed_marks();
131 }
132
133 void ShenandoahClassLoaderDataRoots::clds_do(CLDClosure* strong_clds, CLDClosure* weak_clds, uint worker_id) {
134 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
135 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::CLDGRoots, worker_id);
136 ClassLoaderDataGraph::roots_cld_do(strong_clds, weak_clds);
137 }
138
139 ShenandoahRootProcessor::ShenandoahRootProcessor(ShenandoahPhaseTimings::Phase phase) :
140 _heap(ShenandoahHeap::heap()),
141 _phase(phase) {
142 assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint");
143 _heap->phase_timings()->record_workers_start(_phase);
144 }
145
146 ShenandoahRootProcessor::~ShenandoahRootProcessor() {
147 assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint");
148 _heap->phase_timings()->record_workers_end(_phase);
149 }
150
151 ShenandoahRootEvacuator::ShenandoahRootEvacuator(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
152 ShenandoahRootProcessor(phase),
153 _thread_roots(n_workers > 1),
154 _weak_roots(n_workers) {
155 }
156
157 void ShenandoahRootEvacuator::roots_do(uint worker_id, OopClosure* oops) {
158 MarkingCodeBlobClosure blobsCl(oops, CodeBlobToOopClosure::FixRelocations);
159 CLDToOopClosure clds(oops, ClassLoaderData::_claim_strong);
160 CLDToOopClosure* weak_clds = ShenandoahHeap::heap()->unload_classes() ? NULL : &clds;
161
162 AlwaysTrueClosure always_true;
163
164 _serial_roots.oops_do(oops, worker_id);
165 _jni_roots.oops_do(oops, worker_id);
166
167 _thread_roots.oops_do(oops, NULL, worker_id);
168 _cld_roots.clds_do(&clds, &clds, worker_id);
169 _code_roots.code_blobs_do(&blobsCl, worker_id);
170
171 _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id);
172 _dedup_roots.oops_do(&always_true, oops, worker_id);
173 }
174
175 ShenandoahRootUpdater::ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool update_code_cache) :
176 ShenandoahRootProcessor(phase),
177 _thread_roots(n_workers > 1),
178 _weak_roots(n_workers),
179 _update_code_cache(update_code_cache) {
180 }
181
182 ShenandoahRootAdjuster::ShenandoahRootAdjuster(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
183 ShenandoahRootProcessor(phase),
184 _thread_roots(n_workers > 1),
185 _weak_roots(n_workers) {
186 assert(ShenandoahHeap::heap()->is_full_gc_in_progress(), "Full GC only");
187 }
188
189 void ShenandoahRootAdjuster::roots_do(uint worker_id, OopClosure* oops) {
190 CodeBlobToOopClosure adjust_code_closure(oops, CodeBlobToOopClosure::FixRelocations);
191 CLDToOopClosure adjust_cld_closure(oops, ClassLoaderData::_claim_strong);
192 AlwaysTrueClosure always_true;
193
194 _serial_roots.oops_do(oops, worker_id);
195 _jni_roots.oops_do(oops, worker_id);
196
197 _thread_roots.oops_do(oops, NULL, worker_id);
198 _cld_roots.clds_do(&adjust_cld_closure, NULL, worker_id);
199 _code_roots.code_blobs_do(&adjust_code_closure, worker_id);
200
201 _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id);
202 _dedup_roots.oops_do(&always_true, oops, worker_id);
203 }