Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 2177:3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
author | coleenp |
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date | Thu, 27 Jan 2011 16:11:27 -0800 |
parents | 9afee0b9fc1d |
children | 92da084fefc9 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "code/codeCache.hpp" | |
29 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
30 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
31 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
32 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
33 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
34 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
35 #include "gc_implementation/parallelScavenge/psPermGen.hpp" | |
36 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
37 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
38 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
39 #include "gc_implementation/shared/spaceDecorator.hpp" | |
40 #include "gc_interface/gcCause.hpp" | |
41 #include "memory/gcLocker.inline.hpp" | |
42 #include "memory/referencePolicy.hpp" | |
43 #include "memory/referenceProcessor.hpp" | |
44 #include "oops/oop.inline.hpp" | |
45 #include "runtime/biasedLocking.hpp" | |
46 #include "runtime/fprofiler.hpp" | |
47 #include "runtime/safepoint.hpp" | |
48 #include "runtime/vmThread.hpp" | |
49 #include "services/management.hpp" | |
50 #include "services/memoryService.hpp" | |
51 #include "utilities/events.hpp" | |
52 #include "utilities/stack.inline.hpp" | |
0 | 53 |
54 elapsedTimer PSMarkSweep::_accumulated_time; | |
55 unsigned int PSMarkSweep::_total_invocations = 0; | |
56 jlong PSMarkSweep::_time_of_last_gc = 0; | |
57 CollectorCounters* PSMarkSweep::_counters = NULL; | |
58 | |
59 void PSMarkSweep::initialize() { | |
60 MemRegion mr = Universe::heap()->reserved_region(); | |
61 _ref_processor = new ReferenceProcessor(mr, | |
62 true, // atomic_discovery | |
63 false); // mt_discovery | |
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64 _counters = new CollectorCounters("PSMarkSweep", 1); |
0 | 65 } |
66 | |
67 // This method contains all heap specific policy for invoking mark sweep. | |
68 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact | |
69 // the heap. It will do nothing further. If we need to bail out for policy | |
70 // reasons, scavenge before full gc, or any other specialized behavior, it | |
71 // needs to be added here. | |
72 // | |
73 // Note that this method should only be called from the vm_thread while | |
74 // at a safepoint! | |
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75 // |
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76 // Note that the all_soft_refs_clear flag in the collector policy |
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77 // may be true because this method can be called without intervening |
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78 // activity. For example when the heap space is tight and full measure |
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79 // are being taken to free space. |
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80 |
0 | 81 void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
82 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
83 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
84 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
85 | |
86 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
87 GCCause::Cause gc_cause = heap->gc_cause(); | |
88 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
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89 IsGCActiveMark mark; |
0 | 90 |
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91 if (ScavengeBeforeFullGC) { |
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92 PSScavenge::invoke_no_policy(); |
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93 } |
0 | 94 |
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95 const bool clear_all_soft_refs = |
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96 heap->collector_policy()->should_clear_all_soft_refs(); |
0 | 97 |
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98 int count = (maximum_heap_compaction)?1:MarkSweepAlwaysCompactCount; |
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99 IntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
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100 PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
0 | 101 } |
102 | |
103 // This method contains no policy. You should probably | |
104 // be calling invoke() instead. | |
105 void PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { | |
106 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
107 assert(ref_processor() != NULL, "Sanity"); | |
108 | |
109 if (GC_locker::check_active_before_gc()) { | |
110 return; | |
111 } | |
112 | |
113 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
114 GCCause::Cause gc_cause = heap->gc_cause(); | |
115 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
116 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
117 | |
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118 // The scope of casr should end after code that can change |
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119 // CollectorPolicy::_should_clear_all_soft_refs. |
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120 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy()); |
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121 |
0 | 122 PSYoungGen* young_gen = heap->young_gen(); |
123 PSOldGen* old_gen = heap->old_gen(); | |
124 PSPermGen* perm_gen = heap->perm_gen(); | |
125 | |
126 // Increment the invocation count | |
127 heap->increment_total_collections(true /* full */); | |
128 | |
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129 // Save information needed to minimize mangling |
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130 heap->record_gen_tops_before_GC(); |
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131 |
0 | 132 // We need to track unique mark sweep invocations as well. |
133 _total_invocations++; | |
134 | |
135 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
136 | |
137 if (PrintHeapAtGC) { | |
138 Universe::print_heap_before_gc(); | |
139 } | |
140 | |
141 // Fill in TLABs | |
142 heap->accumulate_statistics_all_tlabs(); | |
143 heap->ensure_parsability(true); // retire TLABs | |
144 | |
145 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
146 HandleMark hm; // Discard invalid handles created during verification | |
147 gclog_or_tty->print(" VerifyBeforeGC:"); | |
148 Universe::verify(true); | |
149 } | |
150 | |
151 // Verify object start arrays | |
152 if (VerifyObjectStartArray && | |
153 VerifyBeforeGC) { | |
154 old_gen->verify_object_start_array(); | |
155 perm_gen->verify_object_start_array(); | |
156 } | |
157 | |
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158 heap->pre_full_gc_dump(); |
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159 |
0 | 160 // Filled in below to track the state of the young gen after the collection. |
161 bool eden_empty; | |
162 bool survivors_empty; | |
163 bool young_gen_empty; | |
164 | |
165 { | |
166 HandleMark hm; | |
167 const bool is_system_gc = gc_cause == GCCause::_java_lang_system_gc; | |
168 // This is useful for debugging but don't change the output the | |
169 // the customer sees. | |
170 const char* gc_cause_str = "Full GC"; | |
171 if (is_system_gc && PrintGCDetails) { | |
172 gc_cause_str = "Full GC (System)"; | |
173 } | |
174 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
175 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
176 TraceTime t1(gc_cause_str, PrintGC, !PrintGCDetails, gclog_or_tty); | |
177 TraceCollectorStats tcs(counters()); | |
178 TraceMemoryManagerStats tms(true /* Full GC */); | |
179 | |
180 if (TraceGen1Time) accumulated_time()->start(); | |
181 | |
182 // Let the size policy know we're starting | |
183 size_policy->major_collection_begin(); | |
184 | |
185 // When collecting the permanent generation methodOops may be moving, | |
186 // so we either have to flush all bcp data or convert it into bci. | |
187 CodeCache::gc_prologue(); | |
188 Threads::gc_prologue(); | |
189 BiasedLocking::preserve_marks(); | |
190 | |
191 // Capture heap size before collection for printing. | |
192 size_t prev_used = heap->used(); | |
193 | |
194 // Capture perm gen size before collection for sizing. | |
195 size_t perm_gen_prev_used = perm_gen->used_in_bytes(); | |
196 | |
197 // For PrintGCDetails | |
198 size_t old_gen_prev_used = old_gen->used_in_bytes(); | |
199 size_t young_gen_prev_used = young_gen->used_in_bytes(); | |
200 | |
201 allocate_stacks(); | |
202 | |
203 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
204 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
205 | |
206 ref_processor()->enable_discovery(); | |
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207 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 208 |
209 mark_sweep_phase1(clear_all_softrefs); | |
210 | |
211 mark_sweep_phase2(); | |
212 | |
213 // Don't add any more derived pointers during phase3 | |
214 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
215 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
216 | |
217 mark_sweep_phase3(); | |
218 | |
219 mark_sweep_phase4(); | |
220 | |
221 restore_marks(); | |
222 | |
223 deallocate_stacks(); | |
224 | |
263
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225 if (ZapUnusedHeapArea) { |
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226 // Do a complete mangle (top to end) because the usage for |
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227 // scratch does not maintain a top pointer. |
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228 young_gen->to_space()->mangle_unused_area_complete(); |
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229 } |
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230 |
0 | 231 eden_empty = young_gen->eden_space()->is_empty(); |
232 if (!eden_empty) { | |
233 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); | |
234 } | |
235 | |
236 // Update heap occupancy information which is used as | |
237 // input to soft ref clearing policy at the next gc. | |
238 Universe::update_heap_info_at_gc(); | |
239 | |
240 survivors_empty = young_gen->from_space()->is_empty() && | |
263
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241 young_gen->to_space()->is_empty(); |
0 | 242 young_gen_empty = eden_empty && survivors_empty; |
243 | |
244 BarrierSet* bs = heap->barrier_set(); | |
245 if (bs->is_a(BarrierSet::ModRef)) { | |
246 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
247 MemRegion old_mr = heap->old_gen()->reserved(); | |
248 MemRegion perm_mr = heap->perm_gen()->reserved(); | |
249 assert(perm_mr.end() <= old_mr.start(), "Generations out of order"); | |
250 | |
251 if (young_gen_empty) { | |
252 modBS->clear(MemRegion(perm_mr.start(), old_mr.end())); | |
253 } else { | |
254 modBS->invalidate(MemRegion(perm_mr.start(), old_mr.end())); | |
255 } | |
256 } | |
257 | |
258 BiasedLocking::restore_marks(); | |
259 Threads::gc_epilogue(); | |
260 CodeCache::gc_epilogue(); | |
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261 JvmtiExport::gc_epilogue(); |
0 | 262 |
263 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
264 | |
265 ref_processor()->enqueue_discovered_references(NULL); | |
266 | |
267 // Update time of last GC | |
268 reset_millis_since_last_gc(); | |
269 | |
270 // Let the size policy know we're done | |
271 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
272 | |
273 if (UseAdaptiveSizePolicy) { | |
274 | |
275 if (PrintAdaptiveSizePolicy) { | |
276 gclog_or_tty->print("AdaptiveSizeStart: "); | |
277 gclog_or_tty->stamp(); | |
278 gclog_or_tty->print_cr(" collection: %d ", | |
279 heap->total_collections()); | |
280 if (Verbose) { | |
281 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d" | |
282 " perm_gen_capacity: %d ", | |
283 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes(), | |
284 perm_gen->capacity_in_bytes()); | |
285 } | |
286 } | |
287 | |
288 // Don't check if the size_policy is ready here. Let | |
289 // the size_policy check that internally. | |
290 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
291 ((gc_cause != GCCause::_java_lang_system_gc) || | |
292 UseAdaptiveSizePolicyWithSystemGC)) { | |
293 // Calculate optimal free space amounts | |
294 assert(young_gen->max_size() > | |
295 young_gen->from_space()->capacity_in_bytes() + | |
296 young_gen->to_space()->capacity_in_bytes(), | |
297 "Sizes of space in young gen are out-of-bounds"); | |
298 size_t max_eden_size = young_gen->max_size() - | |
299 young_gen->from_space()->capacity_in_bytes() - | |
300 young_gen->to_space()->capacity_in_bytes(); | |
301 size_policy->compute_generation_free_space(young_gen->used_in_bytes(), | |
302 young_gen->eden_space()->used_in_bytes(), | |
303 old_gen->used_in_bytes(), | |
304 perm_gen->used_in_bytes(), | |
305 young_gen->eden_space()->capacity_in_bytes(), | |
306 old_gen->max_gen_size(), | |
307 max_eden_size, | |
308 true /* full gc*/, | |
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309 gc_cause, |
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310 heap->collector_policy()); |
0 | 311 |
312 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); | |
313 | |
314 // Don't resize the young generation at an major collection. A | |
315 // desired young generation size may have been calculated but | |
316 // resizing the young generation complicates the code because the | |
317 // resizing of the old generation may have moved the boundary | |
318 // between the young generation and the old generation. Let the | |
319 // young generation resizing happen at the minor collections. | |
320 } | |
321 if (PrintAdaptiveSizePolicy) { | |
322 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
323 heap->total_collections()); | |
324 } | |
325 } | |
326 | |
327 if (UsePerfData) { | |
328 heap->gc_policy_counters()->update_counters(); | |
329 heap->gc_policy_counters()->update_old_capacity( | |
330 old_gen->capacity_in_bytes()); | |
331 heap->gc_policy_counters()->update_young_capacity( | |
332 young_gen->capacity_in_bytes()); | |
333 } | |
334 | |
335 heap->resize_all_tlabs(); | |
336 | |
337 // We collected the perm gen, so we'll resize it here. | |
338 perm_gen->compute_new_size(perm_gen_prev_used); | |
339 | |
340 if (TraceGen1Time) accumulated_time()->stop(); | |
341 | |
342 if (PrintGC) { | |
343 if (PrintGCDetails) { | |
344 // Don't print a GC timestamp here. This is after the GC so | |
345 // would be confusing. | |
346 young_gen->print_used_change(young_gen_prev_used); | |
347 old_gen->print_used_change(old_gen_prev_used); | |
348 } | |
349 heap->print_heap_change(prev_used); | |
350 // Do perm gen after heap becase prev_used does | |
351 // not include the perm gen (done this way in the other | |
352 // collectors). | |
353 if (PrintGCDetails) { | |
354 perm_gen->print_used_change(perm_gen_prev_used); | |
355 } | |
356 } | |
357 | |
358 // Track memory usage and detect low memory | |
359 MemoryService::track_memory_usage(); | |
360 heap->update_counters(); | |
361 } | |
362 | |
363 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
364 HandleMark hm; // Discard invalid handles created during verification | |
365 gclog_or_tty->print(" VerifyAfterGC:"); | |
366 Universe::verify(false); | |
367 } | |
368 | |
369 // Re-verify object start arrays | |
370 if (VerifyObjectStartArray && | |
371 VerifyAfterGC) { | |
372 old_gen->verify_object_start_array(); | |
373 perm_gen->verify_object_start_array(); | |
374 } | |
375 | |
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376 if (ZapUnusedHeapArea) { |
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377 old_gen->object_space()->check_mangled_unused_area_complete(); |
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378 perm_gen->object_space()->check_mangled_unused_area_complete(); |
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379 } |
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380 |
0 | 381 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
382 | |
383 if (PrintHeapAtGC) { | |
384 Universe::print_heap_after_gc(); | |
385 } | |
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386 |
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387 heap->post_full_gc_dump(); |
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388 |
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389 #ifdef TRACESPINNING |
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390 ParallelTaskTerminator::print_termination_counts(); |
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391 #endif |
0 | 392 } |
393 | |
394 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
395 PSYoungGen* young_gen, | |
396 PSOldGen* old_gen) { | |
397 MutableSpace* const eden_space = young_gen->eden_space(); | |
398 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
399 assert(young_gen->virtual_space()->alignment() == | |
400 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
401 | |
402 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
403 return false; | |
404 } | |
405 | |
406 // Both generations must be completely committed. | |
407 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
408 return false; | |
409 } | |
410 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
411 return false; | |
412 } | |
413 | |
414 // Figure out how much to take from eden. Include the average amount promoted | |
415 // in the total; otherwise the next young gen GC will simply bail out to a | |
416 // full GC. | |
417 const size_t alignment = old_gen->virtual_space()->alignment(); | |
418 const size_t eden_used = eden_space->used_in_bytes(); | |
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419 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
0 | 420 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
421 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
422 | |
423 if (absorb_size >= eden_capacity) { | |
424 return false; // Must leave some space in eden. | |
425 } | |
426 | |
427 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
428 if (new_young_size < young_gen->min_gen_size()) { | |
429 return false; // Respect young gen minimum size. | |
430 } | |
431 | |
432 if (TraceAdaptiveGCBoundary && Verbose) { | |
433 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
434 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
435 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
436 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
437 absorb_size / K, | |
438 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
439 young_gen->from_space()->used_in_bytes() / K, | |
440 young_gen->to_space()->used_in_bytes() / K, | |
441 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
442 } | |
443 | |
444 // Fill the unused part of the old gen. | |
445 MutableSpace* const old_space = old_gen->object_space(); | |
481
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446 HeapWord* const unused_start = old_space->top(); |
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447 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
0 | 448 |
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449 if (unused_words > 0) { |
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450 if (unused_words < CollectedHeap::min_fill_size()) { |
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451 return false; // If the old gen cannot be filled, must give up. |
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452 } |
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453 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 454 } |
455 | |
456 // Take the live data from eden and set both top and end in the old gen to | |
457 // eden top. (Need to set end because reset_after_change() mangles the region | |
458 // from end to virtual_space->high() in debug builds). | |
459 HeapWord* const new_top = eden_space->top(); | |
460 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
461 absorb_size); | |
462 young_gen->reset_after_change(); | |
463 old_space->set_top(new_top); | |
464 old_space->set_end(new_top); | |
465 old_gen->reset_after_change(); | |
466 | |
467 // Update the object start array for the filler object and the data from eden. | |
468 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
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469 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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470 start_array->allocate_block(p); |
0 | 471 } |
472 | |
473 // Could update the promoted average here, but it is not typically updated at | |
474 // full GCs and the value to use is unclear. Something like | |
475 // | |
476 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
477 | |
478 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
479 return true; | |
480 } | |
481 | |
482 void PSMarkSweep::allocate_stacks() { | |
483 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
484 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
485 | |
486 PSYoungGen* young_gen = heap->young_gen(); | |
487 | |
488 MutableSpace* to_space = young_gen->to_space(); | |
489 _preserved_marks = (PreservedMark*)to_space->top(); | |
490 _preserved_count = 0; | |
491 | |
492 // We want to calculate the size in bytes first. | |
493 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); | |
494 // Now divide by the size of a PreservedMark | |
495 _preserved_count_max /= sizeof(PreservedMark); | |
496 } | |
497 | |
498 | |
499 void PSMarkSweep::deallocate_stacks() { | |
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500 _preserved_mark_stack.clear(true); |
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501 _preserved_oop_stack.clear(true); |
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502 _marking_stack.clear(); |
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503 _objarray_stack.clear(true); |
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504 _revisit_klass_stack.clear(true); |
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505 _revisit_mdo_stack.clear(true); |
0 | 506 } |
507 | |
508 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { | |
509 // Recursively traverse all live objects and mark them | |
510 EventMark m("1 mark object"); | |
511 TraceTime tm("phase 1", PrintGCDetails && Verbose, true, gclog_or_tty); | |
512 trace(" 1"); | |
513 | |
514 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
515 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
516 | |
517 // General strong roots. | |
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518 { |
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519 ParallelScavengeHeap::ParStrongRootsScope psrs; |
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520 Universe::oops_do(mark_and_push_closure()); |
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521 ReferenceProcessor::oops_do(mark_and_push_closure()); |
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522 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
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523 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
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524 Threads::oops_do(mark_and_push_closure(), &each_active_code_blob); |
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525 ObjectSynchronizer::oops_do(mark_and_push_closure()); |
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526 FlatProfiler::oops_do(mark_and_push_closure()); |
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527 Management::oops_do(mark_and_push_closure()); |
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528 JvmtiExport::oops_do(mark_and_push_closure()); |
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529 SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
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530 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
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531 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
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532 } |
0 | 533 |
534 // Flush marking stack. | |
535 follow_stack(); | |
536 | |
537 // Process reference objects found during marking | |
538 { | |
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539 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 540 ref_processor()->process_discovered_references( |
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541 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL); |
0 | 542 } |
543 | |
544 // Follow system dictionary roots and unload classes | |
545 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
546 | |
547 // Follow code cache roots | |
548 CodeCache::do_unloading(is_alive_closure(), mark_and_push_closure(), | |
549 purged_class); | |
550 follow_stack(); // Flush marking stack | |
551 | |
552 // Update subklass/sibling/implementor links of live klasses | |
553 follow_weak_klass_links(); | |
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554 assert(_marking_stack.is_empty(), "just drained"); |
0 | 555 |
941 | 556 // Visit memoized mdo's and clear unmarked weak refs |
557 follow_mdo_weak_refs(); | |
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558 assert(_marking_stack.is_empty(), "just drained"); |
941 | 559 |
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560 // Visit interned string tables and delete unmarked oops |
0 | 561 StringTable::unlink(is_alive_closure()); |
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562 // Clean up unreferenced symbols in symbol table. |
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563 SymbolTable::unlink(); |
0 | 564 |
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565 assert(_marking_stack.is_empty(), "stack should be empty by now"); |
0 | 566 } |
567 | |
568 | |
569 void PSMarkSweep::mark_sweep_phase2() { | |
570 EventMark m("2 compute new addresses"); | |
571 TraceTime tm("phase 2", PrintGCDetails && Verbose, true, gclog_or_tty); | |
572 trace("2"); | |
573 | |
574 // Now all live objects are marked, compute the new object addresses. | |
575 | |
576 // It is imperative that we traverse perm_gen LAST. If dead space is | |
577 // allowed a range of dead object may get overwritten by a dead int | |
578 // array. If perm_gen is not traversed last a klassOop may get | |
579 // overwritten. This is fine since it is dead, but if the class has dead | |
580 // instances we have to skip them, and in order to find their size we | |
581 // need the klassOop! | |
582 // | |
583 // It is not required that we traverse spaces in the same order in | |
584 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
585 // tracking expects us to do so. See comment under phase4. | |
586 | |
587 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
588 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
589 | |
590 PSOldGen* old_gen = heap->old_gen(); | |
591 PSPermGen* perm_gen = heap->perm_gen(); | |
592 | |
593 // Begin compacting into the old gen | |
594 PSMarkSweepDecorator::set_destination_decorator_tenured(); | |
595 | |
596 // This will also compact the young gen spaces. | |
597 old_gen->precompact(); | |
598 | |
599 // Compact the perm gen into the perm gen | |
600 PSMarkSweepDecorator::set_destination_decorator_perm_gen(); | |
601 | |
602 perm_gen->precompact(); | |
603 } | |
604 | |
605 // This should be moved to the shared markSweep code! | |
606 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
607 public: | |
608 void do_object(oop p) { ShouldNotReachHere(); } | |
609 bool do_object_b(oop p) { return true; } | |
610 }; | |
611 static PSAlwaysTrueClosure always_true; | |
612 | |
613 void PSMarkSweep::mark_sweep_phase3() { | |
614 // Adjust the pointers to reflect the new locations | |
615 EventMark m("3 adjust pointers"); | |
616 TraceTime tm("phase 3", PrintGCDetails && Verbose, true, gclog_or_tty); | |
617 trace("3"); | |
618 | |
619 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
620 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
621 | |
622 PSYoungGen* young_gen = heap->young_gen(); | |
623 PSOldGen* old_gen = heap->old_gen(); | |
624 PSPermGen* perm_gen = heap->perm_gen(); | |
625 | |
626 // General strong roots. | |
627 Universe::oops_do(adjust_root_pointer_closure()); | |
628 ReferenceProcessor::oops_do(adjust_root_pointer_closure()); | |
629 JNIHandles::oops_do(adjust_root_pointer_closure()); // Global (strong) JNI handles | |
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630 Threads::oops_do(adjust_root_pointer_closure(), NULL); |
0 | 631 ObjectSynchronizer::oops_do(adjust_root_pointer_closure()); |
632 FlatProfiler::oops_do(adjust_root_pointer_closure()); | |
633 Management::oops_do(adjust_root_pointer_closure()); | |
634 JvmtiExport::oops_do(adjust_root_pointer_closure()); | |
635 // SO_AllClasses | |
636 SystemDictionary::oops_do(adjust_root_pointer_closure()); | |
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637 //CodeCache::scavenge_root_nmethods_oops_do(adjust_root_pointer_closure()); |
0 | 638 |
639 // Now adjust pointers in remaining weak roots. (All of which should | |
640 // have been cleared if they pointed to non-surviving objects.) | |
641 // Global (weak) JNI handles | |
642 JNIHandles::weak_oops_do(&always_true, adjust_root_pointer_closure()); | |
643 | |
644 CodeCache::oops_do(adjust_pointer_closure()); | |
645 StringTable::oops_do(adjust_root_pointer_closure()); | |
646 ref_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
647 PSScavenge::reference_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
648 | |
649 adjust_marks(); | |
650 | |
651 young_gen->adjust_pointers(); | |
652 old_gen->adjust_pointers(); | |
653 perm_gen->adjust_pointers(); | |
654 } | |
655 | |
656 void PSMarkSweep::mark_sweep_phase4() { | |
657 EventMark m("4 compact heap"); | |
658 TraceTime tm("phase 4", PrintGCDetails && Verbose, true, gclog_or_tty); | |
659 trace("4"); | |
660 | |
661 // All pointers are now adjusted, move objects accordingly | |
662 | |
663 // It is imperative that we traverse perm_gen first in phase4. All | |
664 // classes must be allocated earlier than their instances, and traversing | |
665 // perm_gen first makes sure that all klassOops have moved to their new | |
666 // location before any instance does a dispatch through it's klass! | |
667 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
668 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
669 | |
670 PSYoungGen* young_gen = heap->young_gen(); | |
671 PSOldGen* old_gen = heap->old_gen(); | |
672 PSPermGen* perm_gen = heap->perm_gen(); | |
673 | |
674 perm_gen->compact(); | |
675 old_gen->compact(); | |
676 young_gen->compact(); | |
677 } | |
678 | |
679 jlong PSMarkSweep::millis_since_last_gc() { | |
680 jlong ret_val = os::javaTimeMillis() - _time_of_last_gc; | |
681 // XXX See note in genCollectedHeap::millis_since_last_gc(). | |
682 if (ret_val < 0) { | |
683 NOT_PRODUCT(warning("time warp: %d", ret_val);) | |
684 return 0; | |
685 } | |
686 return ret_val; | |
687 } | |
688 | |
689 void PSMarkSweep::reset_millis_since_last_gc() { | |
690 _time_of_last_gc = os::javaTimeMillis(); | |
691 } |