Mercurial > hg > graal-jvmci-8
comparison src/share/vm/gc_implementation/g1/g1RootProcessor.cpp @ 22909:38d6febe66af
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
Summary: Create a G1RootProcessor and move SharedHeap root processing to GenCollectedHeap
Reviewed-by: brutisso, tschatzl, ehelin
author | mgerdin |
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date | Mon, 01 Dec 2014 15:24:56 +0100 |
parents | |
children | 3ca53859c3c7 |
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22908:c3fcc09c9239 | 22909:38d6febe66af |
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1 /* | |
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #include "precompiled.hpp" | |
26 | |
27 #include "classfile/symbolTable.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "code/codeCache.hpp" | |
30 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
31 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
32 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
33 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" | |
34 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
35 #include "gc_implementation/g1/g1RootProcessor.hpp" | |
36 #include "memory/allocation.inline.hpp" | |
37 #include "runtime/fprofiler.hpp" | |
38 #include "runtime/mutex.hpp" | |
39 #include "services/management.hpp" | |
40 | |
41 class G1CodeBlobClosure : public CodeBlobClosure { | |
42 class HeapRegionGatheringOopClosure : public OopClosure { | |
43 G1CollectedHeap* _g1h; | |
44 OopClosure* _work; | |
45 nmethod* _nm; | |
46 | |
47 template <typename T> | |
48 void do_oop_work(T* p) { | |
49 _work->do_oop(p); | |
50 T oop_or_narrowoop = oopDesc::load_heap_oop(p); | |
51 if (!oopDesc::is_null(oop_or_narrowoop)) { | |
52 oop o = oopDesc::decode_heap_oop_not_null(oop_or_narrowoop); | |
53 HeapRegion* hr = _g1h->heap_region_containing_raw(o); | |
54 assert(!_g1h->obj_in_cs(o) || hr->rem_set()->strong_code_roots_list_contains(_nm), "if o still in CS then evacuation failed and nm must already be in the remset"); | |
55 hr->add_strong_code_root(_nm); | |
56 } | |
57 } | |
58 | |
59 public: | |
60 HeapRegionGatheringOopClosure(OopClosure* oc) : _g1h(G1CollectedHeap::heap()), _work(oc), _nm(NULL) {} | |
61 | |
62 void do_oop(oop* o) { | |
63 do_oop_work(o); | |
64 } | |
65 | |
66 void do_oop(narrowOop* o) { | |
67 do_oop_work(o); | |
68 } | |
69 | |
70 void set_nm(nmethod* nm) { | |
71 _nm = nm; | |
72 } | |
73 }; | |
74 | |
75 HeapRegionGatheringOopClosure _oc; | |
76 public: | |
77 G1CodeBlobClosure(OopClosure* oc) : _oc(oc) {} | |
78 | |
79 void do_code_blob(CodeBlob* cb) { | |
80 nmethod* nm = cb->as_nmethod_or_null(); | |
81 if (nm != NULL) { | |
82 if (!nm->test_set_oops_do_mark()) { | |
83 _oc.set_nm(nm); | |
84 nm->oops_do(&_oc); | |
85 nm->fix_oop_relocations(); | |
86 } | |
87 } | |
88 } | |
89 }; | |
90 | |
91 | |
92 void G1RootProcessor::worker_has_discovered_all_strong_classes() { | |
93 uint n_workers = _g1h->n_par_threads(); | |
94 assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading"); | |
95 | |
96 uint new_value = (uint)Atomic::add(1, &_n_workers_discovered_strong_classes); | |
97 if (new_value == n_workers) { | |
98 // This thread is last. Notify the others. | |
99 MonitorLockerEx ml(&_lock, Mutex::_no_safepoint_check_flag); | |
100 _lock.notify_all(); | |
101 } | |
102 } | |
103 | |
104 void G1RootProcessor::wait_until_all_strong_classes_discovered() { | |
105 uint n_workers = _g1h->n_par_threads(); | |
106 assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading"); | |
107 | |
108 if ((uint)_n_workers_discovered_strong_classes != n_workers) { | |
109 MonitorLockerEx ml(&_lock, Mutex::_no_safepoint_check_flag); | |
110 while ((uint)_n_workers_discovered_strong_classes != n_workers) { | |
111 _lock.wait(Mutex::_no_safepoint_check_flag, 0, false); | |
112 } | |
113 } | |
114 } | |
115 | |
116 G1RootProcessor::G1RootProcessor(G1CollectedHeap* g1h) : | |
117 _g1h(g1h), | |
118 _process_strong_tasks(new SubTasksDone(G1RP_PS_NumElements)), | |
119 _srs(g1h), | |
120 _lock(Mutex::leaf, "G1 Root Scanning barrier lock", false), | |
121 _n_workers_discovered_strong_classes(0) {} | |
122 | |
123 void G1RootProcessor::evacuate_roots(OopClosure* scan_non_heap_roots, | |
124 OopClosure* scan_non_heap_weak_roots, | |
125 CLDClosure* scan_strong_clds, | |
126 CLDClosure* scan_weak_clds, | |
127 bool trace_metadata, | |
128 uint worker_i) { | |
129 // First scan the shared roots. | |
130 double ext_roots_start = os::elapsedTime(); | |
131 | |
132 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
133 BufferingOopClosure buf_scan_non_heap_weak_roots(scan_non_heap_weak_roots); | |
134 | |
135 OopClosure* const weak_roots = &buf_scan_non_heap_weak_roots; | |
136 OopClosure* const strong_roots = &buf_scan_non_heap_roots; | |
137 | |
138 // CodeBlobClosures are not interoperable with BufferingOopClosures | |
139 G1CodeBlobClosure root_code_blobs(scan_non_heap_roots); | |
140 | |
141 process_java_roots(strong_roots, | |
142 trace_metadata ? scan_strong_clds : NULL, | |
143 scan_strong_clds, | |
144 trace_metadata ? NULL : scan_weak_clds, | |
145 &root_code_blobs); | |
146 | |
147 // This is the point where this worker thread will not find more strong CLDs/nmethods. | |
148 // Report this so G1 can synchronize the strong and weak CLDs/nmethods processing. | |
149 if (trace_metadata) { | |
150 worker_has_discovered_all_strong_classes(); | |
151 } | |
152 | |
153 process_vm_roots(strong_roots, weak_roots); | |
154 | |
155 // Now the CM ref_processor roots. | |
156 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_refProcessor_oops_do)) { | |
157 // We need to treat the discovered reference lists of the | |
158 // concurrent mark ref processor as roots and keep entries | |
159 // (which are added by the marking threads) on them live | |
160 // until they can be processed at the end of marking. | |
161 _g1h->ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); | |
162 } | |
163 | |
164 if (trace_metadata) { | |
165 // Barrier to make sure all workers passed | |
166 // the strong CLD and strong nmethods phases. | |
167 wait_until_all_strong_classes_discovered(); | |
168 | |
169 // Now take the complement of the strong CLDs. | |
170 ClassLoaderDataGraph::roots_cld_do(NULL, scan_weak_clds); | |
171 } | |
172 | |
173 // Finish up any enqueued closure apps (attributed as object copy time). | |
174 buf_scan_non_heap_roots.done(); | |
175 buf_scan_non_heap_weak_roots.done(); | |
176 | |
177 double obj_copy_time_sec = buf_scan_non_heap_roots.closure_app_seconds() | |
178 + buf_scan_non_heap_weak_roots.closure_app_seconds(); | |
179 | |
180 G1GCPhaseTimes* phase_times = _g1h->g1_policy()->phase_times(); | |
181 phase_times->record_time_secs(G1GCPhaseTimes::ObjCopy, worker_i, obj_copy_time_sec); | |
182 | |
183 double ext_root_time_sec = os::elapsedTime() - ext_roots_start - obj_copy_time_sec; | |
184 | |
185 phase_times->record_time_secs(G1GCPhaseTimes::ExtRootScan, worker_i, ext_root_time_sec); | |
186 | |
187 // During conc marking we have to filter the per-thread SATB buffers | |
188 // to make sure we remove any oops into the CSet (which will show up | |
189 // as implicitly live). | |
190 { | |
191 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::SATBFiltering, worker_i); | |
192 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_filter_satb_buffers) && _g1h->mark_in_progress()) { | |
193 JavaThread::satb_mark_queue_set().filter_thread_buffers(); | |
194 } | |
195 } | |
196 | |
197 _process_strong_tasks->all_tasks_completed(); | |
198 } | |
199 | |
200 void G1RootProcessor::process_strong_roots(OopClosure* oops, | |
201 CLDClosure* clds, | |
202 CodeBlobClosure* blobs) { | |
203 | |
204 process_java_roots(oops, clds, clds, NULL, blobs); | |
205 process_vm_roots(oops, NULL); | |
206 | |
207 _process_strong_tasks->all_tasks_completed(); | |
208 } | |
209 | |
210 void G1RootProcessor::process_all_roots(OopClosure* oops, | |
211 CLDClosure* clds, | |
212 CodeBlobClosure* blobs) { | |
213 | |
214 process_java_roots(oops, NULL, clds, clds, NULL); | |
215 process_vm_roots(oops, oops); | |
216 | |
217 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_CodeCache_oops_do)) { | |
218 CodeCache::blobs_do(blobs); | |
219 } | |
220 | |
221 _process_strong_tasks->all_tasks_completed(); | |
222 } | |
223 | |
224 void G1RootProcessor::process_java_roots(OopClosure* strong_roots, | |
225 CLDClosure* thread_stack_clds, | |
226 CLDClosure* strong_clds, | |
227 CLDClosure* weak_clds, | |
228 CodeBlobClosure* strong_code) { | |
229 assert(thread_stack_clds == NULL || weak_clds == NULL, "There is overlap between those, only one may be set"); | |
230 // Iterating over the CLDG and the Threads are done early to allow us to | |
231 // first process the strong CLDs and nmethods and then, after a barrier, | |
232 // let the thread process the weak CLDs and nmethods. | |
233 | |
234 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_ClassLoaderDataGraph_oops_do)) { | |
235 ClassLoaderDataGraph::roots_cld_do(strong_clds, weak_clds); | |
236 } | |
237 | |
238 Threads::possibly_parallel_oops_do(strong_roots, thread_stack_clds, strong_code); | |
239 } | |
240 | |
241 void G1RootProcessor::process_vm_roots(OopClosure* strong_roots, | |
242 OopClosure* weak_roots) { | |
243 | |
244 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_Universe_oops_do)) { | |
245 Universe::oops_do(strong_roots); | |
246 } | |
247 | |
248 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_JNIHandles_oops_do)) { | |
249 JNIHandles::oops_do(strong_roots); | |
250 } | |
251 | |
252 if (!_process_strong_tasks-> is_task_claimed(G1RP_PS_ObjectSynchronizer_oops_do)) { | |
253 ObjectSynchronizer::oops_do(strong_roots); | |
254 } | |
255 | |
256 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_FlatProfiler_oops_do)) { | |
257 FlatProfiler::oops_do(strong_roots); | |
258 } | |
259 | |
260 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_Management_oops_do)) { | |
261 Management::oops_do(strong_roots); | |
262 } | |
263 | |
264 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_jvmti_oops_do)) { | |
265 JvmtiExport::oops_do(strong_roots); | |
266 } | |
267 | |
268 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_SystemDictionary_oops_do)) { | |
269 SystemDictionary::roots_oops_do(strong_roots, weak_roots); | |
270 } | |
271 | |
272 // All threads execute the following. A specific chunk of buckets | |
273 // from the StringTable are the individual tasks. | |
274 if (weak_roots != NULL) { | |
275 StringTable::possibly_parallel_oops_do(weak_roots); | |
276 } | |
277 } | |
278 | |
279 void G1RootProcessor::scan_remembered_sets(G1ParPushHeapRSClosure* scan_rs, | |
280 OopClosure* scan_non_heap_weak_roots, | |
281 uint worker_i) { | |
282 // Now scan the complement of the collection set. | |
283 G1CodeBlobClosure scavenge_cs_nmethods(scan_non_heap_weak_roots); | |
284 | |
285 _g1h->g1_rem_set()->oops_into_collection_set_do(scan_rs, &scavenge_cs_nmethods, worker_i); | |
286 } | |
287 | |
288 void G1RootProcessor::set_num_workers(int active_workers) { | |
289 _process_strong_tasks->set_n_threads(active_workers); | |
290 } |