Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 10183:868d87ed63c8
8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
Reviewed-by: mgerdin, coleenp
author | jmasa |
---|---|
date | Tue, 12 Feb 2013 14:15:45 -0800 |
parents | a08c80e9e1e5 |
children | b06ac540229e |
rev | line source |
---|---|
0 | 1 /* |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4712
diff
changeset
|
2 * Copyright (c) 2001, 2012, 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
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/psScavenge.hpp" | |
36 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
37 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
38 #include "gc_implementation/shared/markSweep.hpp" |
1972 | 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 jlong PSMarkSweep::_time_of_last_gc = 0; | |
56 CollectorCounters* PSMarkSweep::_counters = NULL; | |
57 | |
58 void PSMarkSweep::initialize() { | |
59 MemRegion mr = Universe::heap()->reserved_region(); | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2177
diff
changeset
|
60 _ref_processor = new ReferenceProcessor(mr); // a vanilla ref proc |
374
a4b729f5b611
6716466: par compact - remove VerifyParallelOldWithMarkSweep code
jcoomes
parents:
263
diff
changeset
|
61 _counters = new CollectorCounters("PSMarkSweep", 1); |
0 | 62 } |
63 | |
64 // This method contains all heap specific policy for invoking mark sweep. | |
65 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact | |
66 // the heap. It will do nothing further. If we need to bail out for policy | |
67 // reasons, scavenge before full gc, or any other specialized behavior, it | |
68 // needs to be added here. | |
69 // | |
70 // Note that this method should only be called from the vm_thread while | |
71 // at a safepoint! | |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
72 // |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
73 // Note that the all_soft_refs_clear flag in the collector policy |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
74 // may be true because this method can be called without intervening |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
75 // activity. For example when the heap space is tight and full measure |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
76 // are being taken to free space. |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
77 |
0 | 78 void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
79 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
80 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
81 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
82 | |
83 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
84 GCCause::Cause gc_cause = heap->gc_cause(); | |
85 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
86 IsGCActiveMark mark; |
0 | 87 |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
88 if (ScavengeBeforeFullGC) { |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
89 PSScavenge::invoke_no_policy(); |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
90 } |
0 | 91 |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
92 const bool clear_all_soft_refs = |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
93 heap->collector_policy()->should_clear_all_soft_refs(); |
0 | 94 |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
95 int count = (maximum_heap_compaction)?1:MarkSweepAlwaysCompactCount; |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
96 IntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
97 PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
0 | 98 } |
99 | |
100 // This method contains no policy. You should probably | |
101 // be calling invoke() instead. | |
4913
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4872
diff
changeset
|
102 bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { |
0 | 103 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
104 assert(ref_processor() != NULL, "Sanity"); | |
105 | |
106 if (GC_locker::check_active_before_gc()) { | |
4913
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4872
diff
changeset
|
107 return false; |
0 | 108 } |
109 | |
110 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
111 GCCause::Cause gc_cause = heap->gc_cause(); | |
112 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
113 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
114 | |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
115 // The scope of casr should end after code that can change |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
116 // CollectorPolicy::_should_clear_all_soft_refs. |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
117 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy()); |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
118 |
0 | 119 PSYoungGen* young_gen = heap->young_gen(); |
120 PSOldGen* old_gen = heap->old_gen(); | |
121 | |
122 // Increment the invocation count | |
123 heap->increment_total_collections(true /* full */); | |
124 | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
125 // Save information needed to minimize mangling |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
126 heap->record_gen_tops_before_GC(); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
127 |
0 | 128 // We need to track unique mark sweep invocations as well. |
129 _total_invocations++; | |
130 | |
131 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
132 | |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4712
diff
changeset
|
133 heap->print_heap_before_gc(); |
0 | 134 |
135 // Fill in TLABs | |
136 heap->accumulate_statistics_all_tlabs(); | |
137 heap->ensure_parsability(true); // retire TLABs | |
138 | |
139 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
140 HandleMark hm; // Discard invalid handles created during verification | |
141 gclog_or_tty->print(" VerifyBeforeGC:"); | |
6865
4202510ee0fe
8000831: Heap verification output incorrect/incomplete
johnc
parents:
6787
diff
changeset
|
142 Universe::verify(); |
0 | 143 } |
144 | |
145 // Verify object start arrays | |
146 if (VerifyObjectStartArray && | |
147 VerifyBeforeGC) { | |
148 old_gen->verify_object_start_array(); | |
149 } | |
150 | |
615
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
546
diff
changeset
|
151 heap->pre_full_gc_dump(); |
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
546
diff
changeset
|
152 |
0 | 153 // Filled in below to track the state of the young gen after the collection. |
154 bool eden_empty; | |
155 bool survivors_empty; | |
156 bool young_gen_empty; | |
157 | |
158 { | |
159 HandleMark hm; | |
6064
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
4913
diff
changeset
|
160 |
0 | 161 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
162 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
6064
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
4913
diff
changeset
|
163 TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty); |
0 | 164 TraceCollectorStats tcs(counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
2369
diff
changeset
|
165 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
0 | 166 |
167 if (TraceGen1Time) accumulated_time()->start(); | |
168 | |
169 // Let the size policy know we're starting | |
170 size_policy->major_collection_begin(); | |
171 | |
172 CodeCache::gc_prologue(); | |
173 Threads::gc_prologue(); | |
174 BiasedLocking::preserve_marks(); | |
175 | |
176 // Capture heap size before collection for printing. | |
177 size_t prev_used = heap->used(); | |
178 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
179 // Capture metadata size before collection for sizing. |
10183
868d87ed63c8
8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
jmasa
parents:
10179
diff
changeset
|
180 size_t metadata_prev_used = MetaspaceAux::allocated_used_bytes(); |
0 | 181 |
182 // For PrintGCDetails | |
183 size_t old_gen_prev_used = old_gen->used_in_bytes(); | |
184 size_t young_gen_prev_used = young_gen->used_in_bytes(); | |
185 | |
186 allocate_stacks(); | |
187 | |
188 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
189 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3915
diff
changeset
|
190 ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
191 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 192 |
193 mark_sweep_phase1(clear_all_softrefs); | |
194 | |
195 mark_sweep_phase2(); | |
196 | |
197 // Don't add any more derived pointers during phase3 | |
198 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
199 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
200 | |
201 mark_sweep_phase3(); | |
202 | |
203 mark_sweep_phase4(); | |
204 | |
205 restore_marks(); | |
206 | |
207 deallocate_stacks(); | |
208 | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
209 if (ZapUnusedHeapArea) { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
210 // Do a complete mangle (top to end) because the usage for |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
211 // scratch does not maintain a top pointer. |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
212 young_gen->to_space()->mangle_unused_area_complete(); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
213 } |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
214 |
0 | 215 eden_empty = young_gen->eden_space()->is_empty(); |
216 if (!eden_empty) { | |
217 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); | |
218 } | |
219 | |
220 // Update heap occupancy information which is used as | |
221 // input to soft ref clearing policy at the next gc. | |
222 Universe::update_heap_info_at_gc(); | |
223 | |
224 survivors_empty = young_gen->from_space()->is_empty() && | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
225 young_gen->to_space()->is_empty(); |
0 | 226 young_gen_empty = eden_empty && survivors_empty; |
227 | |
228 BarrierSet* bs = heap->barrier_set(); | |
229 if (bs->is_a(BarrierSet::ModRef)) { | |
230 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
231 MemRegion old_mr = heap->old_gen()->reserved(); | |
232 if (young_gen_empty) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
233 modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
0 | 234 } else { |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
235 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
0 | 236 } |
237 } | |
238 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
239 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
240 ClassLoaderDataGraph::purge(); |
10183
868d87ed63c8
8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
jmasa
parents:
10179
diff
changeset
|
241 MetaspaceAux::verify_metrics(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
242 |
0 | 243 BiasedLocking::restore_marks(); |
244 Threads::gc_epilogue(); | |
245 CodeCache::gc_epilogue(); | |
2147
9afee0b9fc1d
7012505: BreakpointWithFullGC.sh fails with Internal Error (src/share/vm/oops/methodOop.cpp:220)
kamg
parents:
1972
diff
changeset
|
246 JvmtiExport::gc_epilogue(); |
0 | 247 |
248 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
249 | |
250 ref_processor()->enqueue_discovered_references(NULL); | |
251 | |
252 // Update time of last GC | |
253 reset_millis_since_last_gc(); | |
254 | |
255 // Let the size policy know we're done | |
256 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
257 | |
258 if (UseAdaptiveSizePolicy) { | |
259 | |
260 if (PrintAdaptiveSizePolicy) { | |
261 gclog_or_tty->print("AdaptiveSizeStart: "); | |
262 gclog_or_tty->stamp(); | |
263 gclog_or_tty->print_cr(" collection: %d ", | |
264 heap->total_collections()); | |
265 if (Verbose) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
266 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d", |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
267 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
0 | 268 } |
269 } | |
270 | |
271 // Don't check if the size_policy is ready here. Let | |
272 // the size_policy check that internally. | |
273 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
274 ((gc_cause != GCCause::_java_lang_system_gc) || | |
275 UseAdaptiveSizePolicyWithSystemGC)) { | |
276 // Calculate optimal free space amounts | |
277 assert(young_gen->max_size() > | |
278 young_gen->from_space()->capacity_in_bytes() + | |
279 young_gen->to_space()->capacity_in_bytes(), | |
280 "Sizes of space in young gen are out-of-bounds"); | |
281 size_t max_eden_size = young_gen->max_size() - | |
282 young_gen->from_space()->capacity_in_bytes() - | |
283 young_gen->to_space()->capacity_in_bytes(); | |
284 size_policy->compute_generation_free_space(young_gen->used_in_bytes(), | |
285 young_gen->eden_space()->used_in_bytes(), | |
286 old_gen->used_in_bytes(), | |
287 young_gen->eden_space()->capacity_in_bytes(), | |
288 old_gen->max_gen_size(), | |
289 max_eden_size, | |
290 true /* full gc*/, | |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
291 gc_cause, |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
292 heap->collector_policy()); |
0 | 293 |
294 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); | |
295 | |
296 // Don't resize the young generation at an major collection. A | |
297 // desired young generation size may have been calculated but | |
298 // resizing the young generation complicates the code because the | |
299 // resizing of the old generation may have moved the boundary | |
300 // between the young generation and the old generation. Let the | |
301 // young generation resizing happen at the minor collections. | |
302 } | |
303 if (PrintAdaptiveSizePolicy) { | |
304 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
305 heap->total_collections()); | |
306 } | |
307 } | |
308 | |
309 if (UsePerfData) { | |
310 heap->gc_policy_counters()->update_counters(); | |
311 heap->gc_policy_counters()->update_old_capacity( | |
312 old_gen->capacity_in_bytes()); | |
313 heap->gc_policy_counters()->update_young_capacity( | |
314 young_gen->capacity_in_bytes()); | |
315 } | |
316 | |
317 heap->resize_all_tlabs(); | |
318 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
319 // We collected the heap, recalculate the metaspace capacity |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
320 MetaspaceGC::compute_new_size(); |
0 | 321 |
322 if (TraceGen1Time) accumulated_time()->stop(); | |
323 | |
324 if (PrintGC) { | |
325 if (PrintGCDetails) { | |
326 // Don't print a GC timestamp here. This is after the GC so | |
327 // would be confusing. | |
328 young_gen->print_used_change(young_gen_prev_used); | |
329 old_gen->print_used_change(old_gen_prev_used); | |
330 } | |
331 heap->print_heap_change(prev_used); | |
332 if (PrintGCDetails) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
333 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
0 | 334 } |
335 } | |
336 | |
337 // Track memory usage and detect low memory | |
338 MemoryService::track_memory_usage(); | |
339 heap->update_counters(); | |
340 } | |
341 | |
342 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
343 HandleMark hm; // Discard invalid handles created during verification | |
344 gclog_or_tty->print(" VerifyAfterGC:"); | |
6865
4202510ee0fe
8000831: Heap verification output incorrect/incomplete
johnc
parents:
6787
diff
changeset
|
345 Universe::verify(); |
0 | 346 } |
347 | |
348 // Re-verify object start arrays | |
349 if (VerifyObjectStartArray && | |
350 VerifyAfterGC) { | |
351 old_gen->verify_object_start_array(); | |
352 } | |
353 | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
354 if (ZapUnusedHeapArea) { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
355 old_gen->object_space()->check_mangled_unused_area_complete(); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
356 } |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
0
diff
changeset
|
357 |
0 | 358 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
359 | |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4712
diff
changeset
|
360 heap->print_heap_after_gc(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
481
diff
changeset
|
361 |
615
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
546
diff
changeset
|
362 heap->post_full_gc_dump(); |
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
546
diff
changeset
|
363 |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
481
diff
changeset
|
364 #ifdef TRACESPINNING |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
481
diff
changeset
|
365 ParallelTaskTerminator::print_termination_counts(); |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
481
diff
changeset
|
366 #endif |
4913
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4872
diff
changeset
|
367 |
ab4422d0ed59
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
4872
diff
changeset
|
368 return true; |
0 | 369 } |
370 | |
371 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
372 PSYoungGen* young_gen, | |
373 PSOldGen* old_gen) { | |
374 MutableSpace* const eden_space = young_gen->eden_space(); | |
375 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
376 assert(young_gen->virtual_space()->alignment() == | |
377 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
378 | |
379 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
380 return false; | |
381 } | |
382 | |
383 // Both generations must be completely committed. | |
384 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
385 return false; | |
386 } | |
387 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
388 return false; | |
389 } | |
390 | |
391 // Figure out how much to take from eden. Include the average amount promoted | |
392 // in the total; otherwise the next young gen GC will simply bail out to a | |
393 // full GC. | |
394 const size_t alignment = old_gen->virtual_space()->alignment(); | |
395 const size_t eden_used = eden_space->used_in_bytes(); | |
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
457
diff
changeset
|
396 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
0 | 397 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
398 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
399 | |
400 if (absorb_size >= eden_capacity) { | |
401 return false; // Must leave some space in eden. | |
402 } | |
403 | |
404 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
405 if (new_young_size < young_gen->min_gen_size()) { | |
406 return false; // Respect young gen minimum size. | |
407 } | |
408 | |
409 if (TraceAdaptiveGCBoundary && Verbose) { | |
410 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
411 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
412 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
413 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
414 absorb_size / K, | |
415 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
416 young_gen->from_space()->used_in_bytes() / K, | |
417 young_gen->to_space()->used_in_bytes() / K, | |
418 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
419 } | |
420 | |
421 // Fill the unused part of the old gen. | |
422 MutableSpace* const old_space = old_gen->object_space(); | |
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
457
diff
changeset
|
423 HeapWord* const unused_start = old_space->top(); |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
457
diff
changeset
|
424 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
0 | 425 |
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
457
diff
changeset
|
426 if (unused_words > 0) { |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
457
diff
changeset
|
427 if (unused_words < CollectedHeap::min_fill_size()) { |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
457
diff
changeset
|
428 return false; // If the old gen cannot be filled, must give up. |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
457
diff
changeset
|
429 } |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
457
diff
changeset
|
430 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 431 } |
432 | |
433 // Take the live data from eden and set both top and end in the old gen to | |
434 // eden top. (Need to set end because reset_after_change() mangles the region | |
435 // from end to virtual_space->high() in debug builds). | |
436 HeapWord* const new_top = eden_space->top(); | |
437 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
438 absorb_size); | |
439 young_gen->reset_after_change(); | |
440 old_space->set_top(new_top); | |
441 old_space->set_end(new_top); | |
442 old_gen->reset_after_change(); | |
443 | |
444 // Update the object start array for the filler object and the data from eden. | |
445 ObjectStartArray* const start_array = old_gen->start_array(); | |
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
457
diff
changeset
|
446 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
457
diff
changeset
|
447 start_array->allocate_block(p); |
0 | 448 } |
449 | |
450 // Could update the promoted average here, but it is not typically updated at | |
451 // full GCs and the value to use is unclear. Something like | |
452 // | |
453 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
454 | |
455 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
456 return true; | |
457 } | |
458 | |
459 void PSMarkSweep::allocate_stacks() { | |
460 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
461 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
462 | |
463 PSYoungGen* young_gen = heap->young_gen(); | |
464 | |
465 MutableSpace* to_space = young_gen->to_space(); | |
466 _preserved_marks = (PreservedMark*)to_space->top(); | |
467 _preserved_count = 0; | |
468 | |
469 // We want to calculate the size in bytes first. | |
470 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); | |
471 // Now divide by the size of a PreservedMark | |
472 _preserved_count_max /= sizeof(PreservedMark); | |
473 } | |
474 | |
475 | |
476 void PSMarkSweep::deallocate_stacks() { | |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
477 _preserved_mark_stack.clear(true); |
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
478 _preserved_oop_stack.clear(true); |
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
479 _marking_stack.clear(); |
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
480 _objarray_stack.clear(true); |
0 | 481 } |
482 | |
483 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { | |
484 // Recursively traverse all live objects and mark them | |
485 TraceTime tm("phase 1", PrintGCDetails && Verbose, true, gclog_or_tty); | |
486 trace(" 1"); | |
487 | |
488 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
489 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
490 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
491 // Need to clear claim bits before the tracing starts. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
492 ClassLoaderDataGraph::clear_claimed_marks(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
493 |
0 | 494 // General strong roots. |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
495 { |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
496 ParallelScavengeHeap::ParStrongRootsScope psrs; |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
497 Universe::oops_do(mark_and_push_closure()); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
498 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
6865
diff
changeset
|
499 CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure()); |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
500 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
6865
diff
changeset
|
501 Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob); |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
502 ObjectSynchronizer::oops_do(mark_and_push_closure()); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
503 FlatProfiler::oops_do(mark_and_push_closure()); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
504 Management::oops_do(mark_and_push_closure()); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
505 JvmtiExport::oops_do(mark_and_push_closure()); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
506 SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
507 ClassLoaderDataGraph::always_strong_oops_do(mark_and_push_closure(), follow_klass_closure(), true); |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
508 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
509 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
628
diff
changeset
|
510 } |
0 | 511 |
512 // Flush marking stack. | |
513 follow_stack(); | |
514 | |
515 // Process reference objects found during marking | |
516 { | |
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
517 ref_processor()->setup_policy(clear_all_softrefs); |
0 | 518 ref_processor()->process_discovered_references( |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
380
diff
changeset
|
519 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL); |
0 | 520 } |
521 | |
522 // Follow system dictionary roots and unload classes | |
523 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
524 | |
525 // Follow code cache roots | |
6787
8966c2d65d96
7200470: KeepAliveClosure not needed in CodeCache::do_unloading
brutisso
parents:
6725
diff
changeset
|
526 CodeCache::do_unloading(is_alive_closure(), purged_class); |
0 | 527 follow_stack(); // Flush marking stack |
528 | |
529 // Update subklass/sibling/implementor links of live klasses | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
530 Klass::clean_weak_klass_links(&is_alive); |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
531 assert(_marking_stack.is_empty(), "just drained"); |
941 | 532 |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2147
diff
changeset
|
533 // Visit interned string tables and delete unmarked oops |
0 | 534 StringTable::unlink(is_alive_closure()); |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2147
diff
changeset
|
535 // Clean up unreferenced symbols in symbol table. |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2147
diff
changeset
|
536 SymbolTable::unlink(); |
0 | 537 |
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1552
diff
changeset
|
538 assert(_marking_stack.is_empty(), "stack should be empty by now"); |
0 | 539 } |
540 | |
541 | |
542 void PSMarkSweep::mark_sweep_phase2() { | |
543 TraceTime tm("phase 2", PrintGCDetails && Verbose, true, gclog_or_tty); | |
544 trace("2"); | |
545 | |
546 // Now all live objects are marked, compute the new object addresses. | |
547 | |
548 // It is not required that we traverse spaces in the same order in | |
549 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
550 // tracking expects us to do so. See comment under phase4. | |
551 | |
552 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
553 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
554 | |
555 PSOldGen* old_gen = heap->old_gen(); | |
556 | |
557 // Begin compacting into the old gen | |
558 PSMarkSweepDecorator::set_destination_decorator_tenured(); | |
559 | |
560 // This will also compact the young gen spaces. | |
561 old_gen->precompact(); | |
562 } | |
563 | |
564 // This should be moved to the shared markSweep code! | |
565 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
566 public: | |
567 void do_object(oop p) { ShouldNotReachHere(); } | |
568 bool do_object_b(oop p) { return true; } | |
569 }; | |
570 static PSAlwaysTrueClosure always_true; | |
571 | |
572 void PSMarkSweep::mark_sweep_phase3() { | |
573 // Adjust the pointers to reflect the new locations | |
574 TraceTime tm("phase 3", PrintGCDetails && Verbose, true, gclog_or_tty); | |
575 trace("3"); | |
576 | |
577 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
578 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
579 | |
580 PSYoungGen* young_gen = heap->young_gen(); | |
581 PSOldGen* old_gen = heap->old_gen(); | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
582 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
583 // Need to clear claim bits before the tracing starts. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6064
diff
changeset
|
584 ClassLoaderDataGraph::clear_claimed_marks(); |
0 | 585 |
586 // General strong roots. | |
10179
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
587 Universe::oops_do(adjust_pointer_closure()); |
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
588 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
589 CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
590 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
591 ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
592 FlatProfiler::oops_do(adjust_pointer_closure()); |
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
593 Management::oops_do(adjust_pointer_closure()); |
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
594 JvmtiExport::oops_do(adjust_pointer_closure()); |
0 | 595 // SO_AllClasses |
10179
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
596 SystemDictionary::oops_do(adjust_pointer_closure()); |
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
597 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true); |
0 | 598 |
599 // Now adjust pointers in remaining weak roots. (All of which should | |
600 // have been cleared if they pointed to non-surviving objects.) | |
601 // Global (weak) JNI handles | |
10179
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
602 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure()); |
0 | 603 |
604 CodeCache::oops_do(adjust_pointer_closure()); | |
10179
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
605 StringTable::oops_do(adjust_pointer_closure()); |
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
606 ref_processor()->weak_oops_do(adjust_pointer_closure()); |
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7179
diff
changeset
|
607 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
0 | 608 |
609 adjust_marks(); | |
610 | |
611 young_gen->adjust_pointers(); | |
612 old_gen->adjust_pointers(); | |
613 } | |
614 | |
615 void PSMarkSweep::mark_sweep_phase4() { | |
616 EventMark m("4 compact heap"); | |
617 TraceTime tm("phase 4", PrintGCDetails && Verbose, true, gclog_or_tty); | |
618 trace("4"); | |
619 | |
620 // All pointers are now adjusted, move objects accordingly | |
621 | |
622 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
623 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
624 | |
625 PSYoungGen* young_gen = heap->young_gen(); | |
626 PSOldGen* old_gen = heap->old_gen(); | |
627 | |
628 old_gen->compact(); | |
629 young_gen->compact(); | |
630 } | |
631 | |
632 jlong PSMarkSweep::millis_since_last_gc() { | |
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
3979
diff
changeset
|
633 // We need a monotonically non-deccreasing time in ms but |
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
3979
diff
changeset
|
634 // os::javaTimeMillis() does not guarantee monotonicity. |
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
3979
diff
changeset
|
635 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
3979
diff
changeset
|
636 jlong ret_val = now - _time_of_last_gc; |
0 | 637 // XXX See note in genCollectedHeap::millis_since_last_gc(). |
638 if (ret_val < 0) { | |
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
3979
diff
changeset
|
639 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
0 | 640 return 0; |
641 } | |
642 return ret_val; | |
643 } | |
644 | |
645 void PSMarkSweep::reset_millis_since_last_gc() { | |
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
3979
diff
changeset
|
646 // We need a monotonically non-deccreasing time in ms but |
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
3979
diff
changeset
|
647 // os::javaTimeMillis() does not guarantee monotonicity. |
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
3979
diff
changeset
|
648 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 649 } |