Mercurial > hg > truffle
annotate src/share/vm/memory/genMarkSweep.cpp @ 12030:330dfb0476f4
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Reviewed-by: jmasa, ehelin
author | brutisso |
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date | Wed, 14 Aug 2013 09:02:32 +0200 |
parents | f2110083203d |
children | bd902affe102 |
rev | line source |
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0 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/javaClasses.hpp" | |
27 #include "classfile/symbolTable.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/codeCache.hpp" | |
31 #include "code/icBuffer.hpp" | |
10405 | 32 #include "gc_implementation/shared/gcHeapSummary.hpp" |
33 #include "gc_implementation/shared/gcTimer.hpp" | |
34 #include "gc_implementation/shared/gcTrace.hpp" | |
35 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 36 #include "gc_interface/collectedHeap.inline.hpp" |
37 #include "memory/genCollectedHeap.hpp" | |
38 #include "memory/genMarkSweep.hpp" | |
39 #include "memory/genOopClosures.inline.hpp" | |
40 #include "memory/generation.inline.hpp" | |
41 #include "memory/modRefBarrierSet.hpp" | |
42 #include "memory/referencePolicy.hpp" | |
43 #include "memory/space.hpp" | |
44 #include "oops/instanceRefKlass.hpp" | |
45 #include "oops/oop.inline.hpp" | |
46 #include "prims/jvmtiExport.hpp" | |
47 #include "runtime/fprofiler.hpp" | |
48 #include "runtime/handles.inline.hpp" | |
49 #include "runtime/synchronizer.hpp" | |
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50 #include "runtime/thread.inline.hpp" |
1972 | 51 #include "runtime/vmThread.hpp" |
52 #include "utilities/copy.hpp" | |
53 #include "utilities/events.hpp" | |
0 | 54 |
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55 void GenMarkSweep::invoke_at_safepoint(int level, ReferenceProcessor* rp, bool clear_all_softrefs) { |
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56 guarantee(level == 1, "We always collect both old and young."); |
0 | 57 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
58 | |
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59 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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60 #ifdef ASSERT |
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61 if (gch->collector_policy()->should_clear_all_soft_refs()) { |
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62 assert(clear_all_softrefs, "Policy should have been checked earlier"); |
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63 } |
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64 #endif |
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65 |
0 | 66 // hook up weak ref data so it can be used during Mark-Sweep |
67 assert(ref_processor() == NULL, "no stomping"); | |
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68 assert(rp != NULL, "should be non-NULL"); |
0 | 69 _ref_processor = rp; |
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70 rp->setup_policy(clear_all_softrefs); |
0 | 71 |
10405 | 72 GCTraceTime t1(GCCauseString("Full GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL); |
73 | |
74 gch->trace_heap_before_gc(_gc_tracer); | |
0 | 75 |
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76 // When collecting the permanent generation Method*s may be moving, |
0 | 77 // so we either have to flush all bcp data or convert it into bci. |
78 CodeCache::gc_prologue(); | |
79 Threads::gc_prologue(); | |
80 | |
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81 // Increment the invocation count |
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82 _total_invocations++; |
0 | 83 |
84 // Capture heap size before collection for printing. | |
85 size_t gch_prev_used = gch->used(); | |
86 | |
87 // Capture used regions for each generation that will be | |
88 // subject to collection, so that card table adjustments can | |
89 // be made intelligently (see clear / invalidate further below). | |
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90 gch->save_used_regions(level); |
0 | 91 |
92 allocate_stacks(); | |
93 | |
94 mark_sweep_phase1(level, clear_all_softrefs); | |
95 | |
96 mark_sweep_phase2(); | |
97 | |
98 // Don't add any more derived pointers during phase3 | |
99 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
100 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
101 | |
102 mark_sweep_phase3(level); | |
103 | |
104 mark_sweep_phase4(); | |
105 | |
106 restore_marks(); | |
107 | |
108 // Set saved marks for allocation profiler (and other things? -- dld) | |
109 // (Should this be in general part?) | |
110 gch->save_marks(); | |
111 | |
112 deallocate_stacks(); | |
113 | |
114 // If compaction completely evacuated all generations younger than this | |
115 // one, then we can clear the card table. Otherwise, we must invalidate | |
116 // it (consider all cards dirty). In the future, we might consider doing | |
117 // compaction within generations only, and doing card-table sliding. | |
118 bool all_empty = true; | |
119 for (int i = 0; all_empty && i < level; i++) { | |
120 Generation* g = gch->get_gen(i); | |
121 all_empty = all_empty && gch->get_gen(i)->used() == 0; | |
122 } | |
123 GenRemSet* rs = gch->rem_set(); | |
124 // Clear/invalidate below make use of the "prev_used_regions" saved earlier. | |
125 if (all_empty) { | |
126 // We've evacuated all generations below us. | |
127 Generation* g = gch->get_gen(level); | |
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128 rs->clear_into_younger(g); |
0 | 129 } else { |
130 // Invalidate the cards corresponding to the currently used | |
131 // region and clear those corresponding to the evacuated region | |
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132 // of all generations just collected. |
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133 rs->invalidate_or_clear(gch->get_gen(1)); |
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134 rs->invalidate_or_clear(gch->get_gen(0)); |
0 | 135 } |
136 | |
137 Threads::gc_epilogue(); | |
138 CodeCache::gc_epilogue(); | |
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139 JvmtiExport::gc_epilogue(); |
0 | 140 |
141 if (PrintGC && !PrintGCDetails) { | |
142 gch->print_heap_change(gch_prev_used); | |
143 } | |
144 | |
145 // refs processing: clean slate | |
146 _ref_processor = NULL; | |
147 | |
148 // Update heap occupancy information which is used as | |
149 // input to soft ref clearing policy at the next gc. | |
150 Universe::update_heap_info_at_gc(); | |
151 | |
152 // Update time of last gc for all generations we collected | |
153 // (which curently is all the generations in the heap). | |
4911 | 154 // We need to use a monotonically non-deccreasing time in ms |
155 // or we will see time-warp warnings and os::javaTimeMillis() | |
156 // does not guarantee monotonicity. | |
157 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; | |
158 gch->update_time_of_last_gc(now); | |
10405 | 159 |
160 gch->trace_heap_after_gc(_gc_tracer); | |
0 | 161 } |
162 | |
163 void GenMarkSweep::allocate_stacks() { | |
164 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
165 // Scratch request on behalf of oldest generation; will do no | |
166 // allocation. | |
167 ScratchBlock* scratch = gch->gather_scratch(gch->_gens[gch->_n_gens-1], 0); | |
168 | |
169 // $$$ To cut a corner, we'll only use the first scratch block, and then | |
170 // revert to malloc. | |
171 if (scratch != NULL) { | |
172 _preserved_count_max = | |
173 scratch->num_words * HeapWordSize / sizeof(PreservedMark); | |
174 } else { | |
175 _preserved_count_max = 0; | |
176 } | |
177 | |
178 _preserved_marks = (PreservedMark*)scratch; | |
179 _preserved_count = 0; | |
180 } | |
181 | |
182 | |
183 void GenMarkSweep::deallocate_stacks() { | |
356 | 184 if (!UseG1GC) { |
185 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
186 gch->release_scratch(); | |
187 } | |
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188 |
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189 _preserved_mark_stack.clear(true); |
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190 _preserved_oop_stack.clear(true); |
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191 _marking_stack.clear(); |
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192 _objarray_stack.clear(true); |
0 | 193 } |
194 | |
195 void GenMarkSweep::mark_sweep_phase1(int level, | |
196 bool clear_all_softrefs) { | |
197 // Recursively traverse all live objects and mark them | |
10405 | 198 GCTraceTime tm("phase 1", PrintGC && Verbose, true, _gc_timer); |
0 | 199 trace(" 1"); |
200 | |
201 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
202 | |
203 // Because follow_root_closure is created statically, cannot | |
204 // use OopsInGenClosure constructor which takes a generation, | |
205 // as the Universe has not been created when the static constructors | |
206 // are run. | |
207 follow_root_closure.set_orig_generation(gch->get_gen(level)); | |
208 | |
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209 // Need new claim bits before marking starts. |
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210 ClassLoaderDataGraph::clear_claimed_marks(); |
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211 |
0 | 212 gch->gen_process_strong_roots(level, |
213 false, // Younger gens are not roots. | |
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214 true, // activate StrongRootsScope |
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215 false, // not scavenging |
0 | 216 SharedHeap::SO_SystemClasses, |
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217 &follow_root_closure, |
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218 true, // walk code active on stacks |
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219 &follow_root_closure, |
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220 &follow_klass_closure); |
0 | 221 |
222 // Process reference objects found during marking | |
223 { | |
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224 ref_processor()->setup_policy(clear_all_softrefs); |
10405 | 225 const ReferenceProcessorStats& stats = |
226 ref_processor()->process_discovered_references( | |
227 &is_alive, &keep_alive, &follow_stack_closure, NULL, _gc_timer); | |
228 gc_tracer()->report_gc_reference_stats(stats); | |
0 | 229 } |
230 | |
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231 // This is the point where the entire marking should have completed. |
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232 assert(_marking_stack.is_empty(), "Marking should have completed"); |
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233 |
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234 // Unload classes and purge the SystemDictionary. |
0 | 235 bool purged_class = SystemDictionary::do_unloading(&is_alive); |
236 | |
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237 // Unload nmethods. |
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238 CodeCache::do_unloading(&is_alive, purged_class); |
0 | 239 |
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240 // Prune dead klasses from subklass/sibling/implementor lists. |
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241 Klass::clean_weak_klass_links(&is_alive); |
941 | 242 |
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243 // Delete entries for dead interned strings. |
0 | 244 StringTable::unlink(&is_alive); |
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245 |
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246 // Clean up unreferenced symbols in symbol table. |
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247 SymbolTable::unlink(); |
10405 | 248 |
249 gc_tracer()->report_object_count_after_gc(&is_alive); | |
0 | 250 } |
251 | |
252 | |
253 void GenMarkSweep::mark_sweep_phase2() { | |
254 // Now all live objects are marked, compute the new object addresses. | |
255 | |
256 // It is imperative that we traverse perm_gen LAST. If dead space is | |
257 // allowed a range of dead object may get overwritten by a dead int | |
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258 // array. If perm_gen is not traversed last a Klass* may get |
0 | 259 // overwritten. This is fine since it is dead, but if the class has dead |
260 // instances we have to skip them, and in order to find their size we | |
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261 // need the Klass*! |
0 | 262 // |
263 // It is not required that we traverse spaces in the same order in | |
264 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
265 // tracking expects us to do so. See comment under phase4. | |
266 | |
267 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
268 | |
10405 | 269 GCTraceTime tm("phase 2", PrintGC && Verbose, true, _gc_timer); |
0 | 270 trace("2"); |
271 | |
272 gch->prepare_for_compaction(); | |
273 } | |
274 | |
275 class GenAdjustPointersClosure: public GenCollectedHeap::GenClosure { | |
276 public: | |
277 void do_generation(Generation* gen) { | |
278 gen->adjust_pointers(); | |
279 } | |
280 }; | |
281 | |
282 void GenMarkSweep::mark_sweep_phase3(int level) { | |
283 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
284 | |
285 // Adjust the pointers to reflect the new locations | |
10405 | 286 GCTraceTime tm("phase 3", PrintGC && Verbose, true, _gc_timer); |
0 | 287 trace("3"); |
288 | |
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289 // Need new claim bits for the pointer adjustment tracing. |
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290 ClassLoaderDataGraph::clear_claimed_marks(); |
0 | 291 |
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292 // Because the closure below is created statically, we cannot |
0 | 293 // use OopsInGenClosure constructor which takes a generation, |
294 // as the Universe has not been created when the static constructors | |
295 // are run. | |
296 adjust_pointer_closure.set_orig_generation(gch->get_gen(level)); | |
297 | |
298 gch->gen_process_strong_roots(level, | |
299 false, // Younger gens are not roots. | |
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300 true, // activate StrongRootsScope |
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301 false, // not scavenging |
0 | 302 SharedHeap::SO_AllClasses, |
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303 &adjust_pointer_closure, |
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304 false, // do not walk code |
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305 &adjust_pointer_closure, |
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306 &adjust_klass_closure); |
0 | 307 |
308 // Now adjust pointers in remaining weak roots. (All of which should | |
309 // have been cleared if they pointed to non-surviving objects.) | |
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310 CodeBlobToOopClosure adjust_code_pointer_closure(&adjust_pointer_closure, |
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311 /*do_marking=*/ false); |
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312 gch->gen_process_weak_roots(&adjust_pointer_closure, |
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313 &adjust_code_pointer_closure); |
0 | 314 |
315 adjust_marks(); | |
316 GenAdjustPointersClosure blk; | |
317 gch->generation_iterate(&blk, true); | |
318 } | |
319 | |
320 class GenCompactClosure: public GenCollectedHeap::GenClosure { | |
321 public: | |
322 void do_generation(Generation* gen) { | |
323 gen->compact(); | |
324 } | |
325 }; | |
326 | |
327 void GenMarkSweep::mark_sweep_phase4() { | |
328 // All pointers are now adjusted, move objects accordingly | |
329 | |
330 // It is imperative that we traverse perm_gen first in phase4. All | |
331 // classes must be allocated earlier than their instances, and traversing | |
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332 // perm_gen first makes sure that all Klass*s have moved to their new |
0 | 333 // location before any instance does a dispatch through it's klass! |
334 | |
335 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
336 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
337 // here (perm_gen first rather than last), so we tell the validate code | |
338 // to use a higher index (saved from phase2) when verifying perm_gen. | |
339 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
340 | |
10405 | 341 GCTraceTime tm("phase 4", PrintGC && Verbose, true, _gc_timer); |
0 | 342 trace("4"); |
343 | |
344 GenCompactClosure blk; | |
345 gch->generation_iterate(&blk, true); | |
346 } |