1 /*
2 * Copyright (c) 2015, 2018, 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/classLoaderData.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.inline.hpp"
33 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
34 #include "gc/shenandoah/shenandoahStringDedup.hpp"
35 #include "gc/shenandoah/shenandoahVMOperations.hpp"
36 #include "gc/shenandoah/heuristics/shenandoahHeuristics.hpp"
37 #include "gc/shared/weakProcessor.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/iterator.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "runtime/thread.hpp"
42 #include "services/management.hpp"
43
44 ShenandoahSerialRoot::ShenandoahSerialRoot(ShenandoahSerialRoot::OopsDo oops_do,
45 ShenandoahPhaseTimings::Phase phase, ShenandoahPhaseTimings::ParPhase par_phase) :
46 _oops_do(oops_do), _phase(phase), _par_phase(par_phase) {
47 }
48
49 void ShenandoahSerialRoot::oops_do(OopClosure* cl, uint worker_id) {
50 if (_claimed.try_set()) {
51 ShenandoahWorkerTimingsTracker timer(_phase, _par_phase, worker_id);
52 _oops_do(cl);
53 }
54 }
55
56 ShenandoahSerialRoots::ShenandoahSerialRoots(ShenandoahPhaseTimings::Phase phase) :
57 _universe_root(&ShenandoahSerialRoots::universe_oops_do, phase, ShenandoahPhaseTimings::UniverseRoots),
58 _object_synchronizer_root(&ObjectSynchronizer::oops_do, phase, ShenandoahPhaseTimings::ObjectSynchronizerRoots),
59 _management_root(&Management::oops_do, phase, ShenandoahPhaseTimings::ManagementRoots),
60 _system_dictionary_root(&SystemDictionary::oops_do, phase, ShenandoahPhaseTimings::SystemDictionaryRoots),
61 _jvmti_root(&JvmtiExport::oops_do, phase, ShenandoahPhaseTimings::JVMTIRoots) {
62 }
63
64 void ShenandoahSerialRoots::oops_do(OopClosure* cl, uint worker_id) {
65 _universe_root.oops_do(cl, worker_id);
66 _object_synchronizer_root.oops_do(cl, worker_id);
67 _management_root.oops_do(cl, worker_id);
68 _system_dictionary_root.oops_do(cl, worker_id);
69 _jvmti_root.oops_do(cl, worker_id);
70 }
71
72 ShenandoahJNIHandleRoots::ShenandoahJNIHandleRoots(ShenandoahPhaseTimings::Phase phase) :
73 ShenandoahSerialRoot(&JNIHandles::oops_do, phase, ShenandoahPhaseTimings::JNIRoots) {
74 }
75
76 ShenandoahThreadRoots::ShenandoahThreadRoots(ShenandoahPhaseTimings::Phase phase, bool is_par) :
77 _phase(phase), _is_par(is_par) {
78 Threads::change_thread_claim_parity();
79 }
80
81 void ShenandoahThreadRoots::oops_do(OopClosure* oops_cl, CodeBlobClosure* code_cl, uint worker_id) {
82 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::ThreadRoots, worker_id);
83 ResourceMark rm;
84 Threads::possibly_parallel_oops_do(_is_par, oops_cl, code_cl);
85 }
86
87 void ShenandoahThreadRoots::threads_do(ThreadClosure* tc, uint worker_id) {
88 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::ThreadRoots, worker_id);
89 ResourceMark rm;
90 Threads::possibly_parallel_threads_do(_is_par, tc);
91 }
92
93 ShenandoahThreadRoots::~ShenandoahThreadRoots() {
94 Threads::assert_all_threads_claimed();
95 }
96
97 ShenandoahWeakRoots::ShenandoahWeakRoots(ShenandoahPhaseTimings::Phase phase, uint n_workers) :
98 _phase(phase),
99 _par_state_string(StringTable::weak_storage()),
100 _claimed(false) {
101 }
102
103 ShenandoahWeakRoots::~ShenandoahWeakRoots() {
104 }
105
106 ShenandoahStringDedupRoots::ShenandoahStringDedupRoots(ShenandoahPhaseTimings::Phase phase) : _phase(phase) {
107 if (ShenandoahStringDedup::is_enabled()) {
108 StringDedup::gc_prologue(false);
109 }
110 }
111
112 ShenandoahStringDedupRoots::~ShenandoahStringDedupRoots() {
113 if (ShenandoahStringDedup::is_enabled()) {
114 StringDedup::gc_epilogue();
115 }
116 }
117
118 void ShenandoahStringDedupRoots::oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {
119 if (ShenandoahStringDedup::is_enabled()) {
120 ShenandoahStringDedup::parallel_oops_do(_phase, is_alive, keep_alive, worker_id);
121 }
122 }
123
124 ShenandoahRootProcessor::ShenandoahRootProcessor(ShenandoahPhaseTimings::Phase phase) :
125 _heap(ShenandoahHeap::heap()),
126 _phase(phase),
127 _worker_phase(phase) {
128 assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint");
129 }
130
131 ShenandoahRootEvacuator::ShenandoahRootEvacuator(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
132 ShenandoahRootProcessor(phase),
133 _serial_roots(phase),
134 _jni_roots(phase),
135 _cld_roots(phase, n_workers),
136 _thread_roots(phase, n_workers > 1),
137 _weak_roots(phase, n_workers),
138 _dedup_roots(phase),
139 _code_roots(phase) {
140 }
141
142 void ShenandoahRootEvacuator::roots_do(uint worker_id, OopClosure* oops) {
143 MarkingCodeBlobClosure blobsCl(oops, CodeBlobToOopClosure::FixRelocations);
144 CLDToOopClosure clds(oops);
145
146 AlwaysTrueClosure always_true;
147
148 // Process serial-claiming roots first
149 _serial_roots.oops_do(oops, worker_id);
150 _jni_roots.oops_do(oops, worker_id);
151
152 // Process light-weight/limited parallel roots then
153 _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id);
154 _dedup_roots.oops_do(&always_true, oops, worker_id);
155 _cld_roots.cld_do(&clds, worker_id);
156
157 // Process heavy-weight/fully parallel roots the last
158 _code_roots.code_blobs_do(&blobsCl, worker_id);
159 _thread_roots.oops_do(oops, NULL, worker_id);
160 }
161
162 ShenandoahRootUpdater::ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool update_code_cache) :
163 ShenandoahRootProcessor(phase),
164 _serial_roots(phase),
165 _jni_roots(phase),
166 _cld_roots(phase, n_workers),
167 _thread_roots(phase, n_workers > 1),
168 _weak_roots(phase, n_workers),
169 _dedup_roots(phase),
170 _code_roots(phase),
171 _update_code_cache(update_code_cache) {
172 }
173
174 ShenandoahRootAdjuster::ShenandoahRootAdjuster(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
175 ShenandoahRootProcessor(phase),
176 _serial_roots(phase),
177 _jni_roots(phase),
178 _cld_roots(phase, n_workers),
179 _thread_roots(phase, n_workers > 1),
180 _weak_roots(phase, n_workers),
181 _dedup_roots(phase),
182 _code_roots(phase) {
183 assert(ShenandoahHeap::heap()->is_full_gc_in_progress(), "Full GC only");
184 }
185
186 void ShenandoahRootAdjuster::roots_do(uint worker_id, OopClosure* oops) {
187 CodeBlobToOopClosure adjust_code_closure(oops, CodeBlobToOopClosure::FixRelocations);
188 CLDToOopClosure adjust_cld_closure(oops);
189 AlwaysTrueClosure always_true;
190
191 // Process serial-claiming roots first
192 _serial_roots.oops_do(oops, worker_id);
193 _jni_roots.oops_do(oops, worker_id);
194
195 // Process light-weight/limited parallel roots then
196 _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id);
197 _dedup_roots.oops_do(&always_true, oops, worker_id);
198 _cld_roots.cld_do(&adjust_cld_closure, worker_id);
199
200 // Process heavy-weight/fully parallel roots the last
201 _code_roots.code_blobs_do(&adjust_code_closure, worker_id);
202 _thread_roots.oops_do(oops, NULL, worker_id);
203 }
204
205 ShenandoahHeapIterationRootScanner::ShenandoahHeapIterationRootScanner() :
206 ShenandoahRootProcessor(ShenandoahPhaseTimings::heap_iteration_roots),
207 _serial_roots(ShenandoahPhaseTimings::heap_iteration_roots),
208 _thread_roots(ShenandoahPhaseTimings::heap_iteration_roots, false /*is par*/),
209 _jni_roots(ShenandoahPhaseTimings::heap_iteration_roots),
210 _cld_roots(ShenandoahPhaseTimings::heap_iteration_roots, 1),
211 _weak_roots(ShenandoahPhaseTimings::heap_iteration_roots, 1),
212 _dedup_roots(ShenandoahPhaseTimings::heap_iteration_roots),
213 _code_roots(ShenandoahPhaseTimings::heap_iteration_roots)
214 { }
215
216 void ShenandoahHeapIterationRootScanner::roots_do(OopClosure* oops) {
217 assert(Thread::current()->is_VM_thread(), "Only by VM thread");
218 // Must use _claim_none to avoid interfering with concurrent CLDG iteration
219 CLDToOopClosure clds(oops, false);
220 MarkingCodeBlobClosure code(oops, !CodeBlobToOopClosure::FixRelocations);
221 ShenandoahParallelOopsDoThreadClosure tc_cl(oops, &code, NULL);
222 AlwaysTrueClosure always_true;
223 ResourceMark rm;
224
225 // Process serial-claiming roots first
226 _serial_roots.oops_do(oops, 0);
227 _jni_roots.oops_do(oops, 0);
228
229 // Process light-weight/limited parallel roots then
230 _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, 0);
231 _dedup_roots.oops_do(&always_true, oops, 0);
232 _cld_roots.cld_do(&clds, 0);
233
234 // Process heavy-weight/fully parallel roots the last
235 _code_roots.code_blobs_do(&code, 0);
236 _thread_roots.threads_do(&tc_cl, 0);
237
238 }