rev 55429 : 8226413: Shenandoah: Separate root scanner for SH::object_iterate()
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 ShenandoahThreadRoots::ShenandoahThreadRoots(bool is_par) : _is_par(is_par) {
75 Threads::change_thread_claim_token();
76 }
77
78 void ShenandoahThreadRoots::oops_do(OopClosure* oops_cl, CodeBlobClosure* code_cl, uint worker_id) {
79 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
80 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::ThreadRoots, worker_id);
81 ResourceMark rm;
82 Threads::possibly_parallel_oops_do(_is_par, oops_cl, code_cl);
83 }
84
85 void ShenandoahThreadRoots::threads_do(ThreadClosure* tc, uint worker_id) {
86 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
87 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::ThreadRoots, worker_id);
88 ResourceMark rm;
89 Threads::possibly_parallel_threads_do(_is_par, tc);
90 }
91
92 ShenandoahThreadRoots::~ShenandoahThreadRoots() {
93 Threads::assert_all_threads_claimed();
94 }
95
96 ShenandoahWeakRoots::ShenandoahWeakRoots(uint n_workers) :
97 _process_timings(n_workers),
98 _task(&_process_timings, n_workers) {
99 }
100
101 ShenandoahWeakRoots::~ShenandoahWeakRoots() {
102 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
103 ShenandoahTimingConverter::weak_processing_timing_to_shenandoah_timing(&_process_timings,
104 worker_times);
105 }
106
107 ShenandoahStringDedupRoots::ShenandoahStringDedupRoots() {
108 if (ShenandoahStringDedup::is_enabled()) {
109 StringDedup::gc_prologue(false);
110 }
111 }
112
113 ShenandoahStringDedupRoots::~ShenandoahStringDedupRoots() {
114 if (ShenandoahStringDedup::is_enabled()) {
115 StringDedup::gc_epilogue();
116 }
117 }
118
119 void ShenandoahStringDedupRoots::oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {
120 if (ShenandoahStringDedup::is_enabled()) {
121 ShenandoahStringDedup::parallel_oops_do(is_alive, keep_alive, worker_id);
122 }
123 }
124
125 ShenandoahRootProcessor::ShenandoahRootProcessor(ShenandoahPhaseTimings::Phase phase) :
126 _heap(ShenandoahHeap::heap()),
127 _phase(phase) {
128 assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint");
129 _heap->phase_timings()->record_workers_start(_phase);
130 }
131
132 ShenandoahRootProcessor::~ShenandoahRootProcessor() {
133 assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint");
134 _heap->phase_timings()->record_workers_end(_phase);
135 }
136
137 ShenandoahRootEvacuator::ShenandoahRootEvacuator(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool include_concurrent_roots) :
138 ShenandoahRootProcessor(phase),
139 _thread_roots(n_workers > 1),
140 _weak_roots(n_workers),
141 _include_concurrent_roots(include_concurrent_roots) {
142 }
143
144 void ShenandoahRootEvacuator::roots_do(uint worker_id, OopClosure* oops) {
145 MarkingCodeBlobClosure blobsCl(oops, CodeBlobToOopClosure::FixRelocations);
146 CLDToOopClosure clds(oops, ClassLoaderData::_claim_strong);
147 AlwaysTrueClosure always_true;
148
149 _serial_roots.oops_do(oops, worker_id);
150 if (_include_concurrent_roots) {
151 _jni_roots.oops_do<OopClosure>(oops, worker_id);
152 }
153
154 _thread_roots.oops_do(oops, NULL, worker_id);
155 _cld_roots.clds_do(&clds, &clds, worker_id);
156 _code_roots.code_blobs_do(&blobsCl, worker_id);
157
158 _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id);
159 _dedup_roots.oops_do(&always_true, oops, worker_id);
160 }
161
162 ShenandoahRootUpdater::ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool update_code_cache) :
163 ShenandoahRootProcessor(phase),
164 _thread_roots(n_workers > 1),
165 _weak_roots(n_workers),
166 _update_code_cache(update_code_cache) {
167 }
168
169 ShenandoahRootAdjuster::ShenandoahRootAdjuster(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
170 ShenandoahRootProcessor(phase),
171 _thread_roots(n_workers > 1),
172 _weak_roots(n_workers) {
173 assert(ShenandoahHeap::heap()->is_full_gc_in_progress(), "Full GC only");
174 }
175
176 void ShenandoahRootAdjuster::roots_do(uint worker_id, OopClosure* oops) {
177 CodeBlobToOopClosure adjust_code_closure(oops, CodeBlobToOopClosure::FixRelocations);
178 CLDToOopClosure adjust_cld_closure(oops, ClassLoaderData::_claim_strong);
179 AlwaysTrueClosure always_true;
180
181 _serial_roots.oops_do(oops, worker_id);
182 _jni_roots.oops_do(oops, worker_id);
183
184 _thread_roots.oops_do(oops, NULL, worker_id);
185 _cld_roots.clds_do(&adjust_cld_closure, NULL, worker_id);
186 _code_roots.code_blobs_do(&adjust_code_closure, worker_id);
187
188 _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id);
189 _dedup_roots.oops_do(&always_true, oops, worker_id);
190 }
191
192 ShenandoahHeapIterationRootScanner::ShenandoahHeapIterationRootScanner() :
193 ShenandoahRootProcessor(ShenandoahPhaseTimings::_num_phases),
194 _thread_roots(false /*is par*/) {
195 }
196
197 void ShenandoahHeapIterationRootScanner::roots_do(OopClosure* oops) {
198 assert(Thread::current()->is_VM_thread(), "Only by VM thread");
199 // Must use _claim_none to avoid interfering with concurrent CLDG iteration
200 CLDToOopClosure clds(oops, ClassLoaderData::_claim_none);
201 MarkingCodeBlobClosure code(oops, !CodeBlobToOopClosure::FixRelocations);
202 ShenandoahParallelOopsDoThreadClosure tc_cl(oops, &code, NULL);
203 ResourceMark rm;
204
205 _serial_roots.oops_do(oops, 0);
206 _jni_roots.oops_do(oops, 0);
207 _cld_roots.clds_do(&clds, &clds, 0);
208 _thread_roots.threads_do(&tc_cl, 0);
209 _code_roots.code_blobs_do(&code, 0);
210 }
211
212 void ShenandoahHeapIterationRootScanner::strong_roots_do(OopClosure* oops) {
213 assert(Thread::current()->is_VM_thread(), "Only by VM thread");
214 // Must use _claim_none to avoid interfering with concurrent CLDG iteration
215 CLDToOopClosure clds(oops, ClassLoaderData::_claim_none);
216 MarkingCodeBlobClosure code(oops, !CodeBlobToOopClosure::FixRelocations);
217 ShenandoahParallelOopsDoThreadClosure tc_cl(oops, &code, NULL);
218 ResourceMark rm;
219
220 _serial_roots.oops_do(oops, 0);
221 _jni_roots.oops_do(oops, 0);
222 _cld_roots.clds_do(&clds, NULL, 0);
223 _thread_roots.threads_do(&tc_cl, 0);
224 }
--- EOF ---