Mercurial > hg > truffle
annotate src/share/vm/gc_interface/collectedHeap.cpp @ 17962:a103c376459a
8041980: (hotspot) sun/jvmstat/monitor/MonitoredVm/CR6672135.java failing on all platforms
Reviewed-by: mgronlun, kamg
author | sla |
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date | Mon, 28 Apr 2014 09:27:47 +0200 |
parents | 78bbf4d43a14 |
children | 52b4284cb496 0982ec23da03 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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/systemDictionary.hpp" | |
10405 | 27 #include "gc_implementation/shared/gcHeapSummary.hpp" |
28 #include "gc_implementation/shared/gcTrace.hpp" | |
29 #include "gc_implementation/shared/gcTraceTime.hpp" | |
30 #include "gc_implementation/shared/gcWhen.hpp" | |
1972 | 31 #include "gc_implementation/shared/vmGCOperations.hpp" |
10405 | 32 #include "gc_interface/allocTracer.hpp" |
1972 | 33 #include "gc_interface/collectedHeap.hpp" |
34 #include "gc_interface/collectedHeap.inline.hpp" | |
10405 | 35 #include "memory/metaspace.hpp" |
1972 | 36 #include "oops/oop.inline.hpp" |
4009 | 37 #include "oops/instanceMirrorKlass.hpp" |
1972 | 38 #include "runtime/init.hpp" |
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39 #include "runtime/thread.inline.hpp" |
1972 | 40 #include "services/heapDumper.hpp" |
0 | 41 |
42 | |
43 #ifdef ASSERT | |
44 int CollectedHeap::_fire_out_of_memory_count = 0; | |
45 #endif | |
46 | |
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47 size_t CollectedHeap::_filler_array_max_size = 0; |
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48 |
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49 template <> |
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50 void EventLogBase<GCMessage>::print(outputStream* st, GCMessage& m) { |
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51 st->print_cr("GC heap %s", m.is_before ? "before" : "after"); |
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52 st->print_raw(m); |
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53 } |
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54 |
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55 void GCHeapLog::log_heap(bool before) { |
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56 if (!should_log()) { |
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57 return; |
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58 } |
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59 |
4944 | 60 double timestamp = fetch_timestamp(); |
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61 MutexLockerEx ml(&_mutex, Mutex::_no_safepoint_check_flag); |
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62 int index = compute_log_index(); |
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63 _records[index].thread = NULL; // Its the GC thread so it's not that interesting. |
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64 _records[index].timestamp = timestamp; |
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65 _records[index].data.is_before = before; |
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66 stringStream st(_records[index].data.buffer(), _records[index].data.size()); |
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67 if (before) { |
4944 | 68 Universe::print_heap_before_gc(&st, true); |
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69 } else { |
4944 | 70 Universe::print_heap_after_gc(&st, true); |
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71 } |
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72 } |
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73 |
10405 | 74 VirtualSpaceSummary CollectedHeap::create_heap_space_summary() { |
75 size_t capacity_in_words = capacity() / HeapWordSize; | |
76 | |
77 return VirtualSpaceSummary( | |
78 reserved_region().start(), reserved_region().start() + capacity_in_words, reserved_region().end()); | |
79 } | |
80 | |
81 GCHeapSummary CollectedHeap::create_heap_summary() { | |
82 VirtualSpaceSummary heap_space = create_heap_space_summary(); | |
83 return GCHeapSummary(heap_space, used()); | |
84 } | |
85 | |
86 MetaspaceSummary CollectedHeap::create_metaspace_summary() { | |
87 const MetaspaceSizes meta_space( | |
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88 MetaspaceAux::committed_bytes(), |
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89 MetaspaceAux::used_bytes(), |
12235 | 90 MetaspaceAux::reserved_bytes()); |
10405 | 91 const MetaspaceSizes data_space( |
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92 MetaspaceAux::committed_bytes(Metaspace::NonClassType), |
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93 MetaspaceAux::used_bytes(Metaspace::NonClassType), |
12235 | 94 MetaspaceAux::reserved_bytes(Metaspace::NonClassType)); |
10405 | 95 const MetaspaceSizes class_space( |
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96 MetaspaceAux::committed_bytes(Metaspace::ClassType), |
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97 MetaspaceAux::used_bytes(Metaspace::ClassType), |
12235 | 98 MetaspaceAux::reserved_bytes(Metaspace::ClassType)); |
10405 | 99 |
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100 const MetaspaceChunkFreeListSummary& ms_chunk_free_list_summary = |
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101 MetaspaceAux::chunk_free_list_summary(Metaspace::NonClassType); |
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102 const MetaspaceChunkFreeListSummary& class_chunk_free_list_summary = |
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103 MetaspaceAux::chunk_free_list_summary(Metaspace::ClassType); |
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104 |
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105 return MetaspaceSummary(MetaspaceGC::capacity_until_GC(), meta_space, data_space, class_space, |
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106 ms_chunk_free_list_summary, class_chunk_free_list_summary); |
10405 | 107 } |
108 | |
109 void CollectedHeap::print_heap_before_gc() { | |
110 if (PrintHeapAtGC) { | |
111 Universe::print_heap_before_gc(); | |
112 } | |
113 if (_gc_heap_log != NULL) { | |
114 _gc_heap_log->log_heap_before(); | |
115 } | |
116 } | |
117 | |
118 void CollectedHeap::print_heap_after_gc() { | |
119 if (PrintHeapAtGC) { | |
120 Universe::print_heap_after_gc(); | |
121 } | |
122 if (_gc_heap_log != NULL) { | |
123 _gc_heap_log->log_heap_after(); | |
124 } | |
125 } | |
126 | |
12080 | 127 void CollectedHeap::register_nmethod(nmethod* nm) { |
128 assert_locked_or_safepoint(CodeCache_lock); | |
129 } | |
130 | |
131 void CollectedHeap::unregister_nmethod(nmethod* nm) { | |
132 assert_locked_or_safepoint(CodeCache_lock); | |
133 } | |
134 | |
10405 | 135 void CollectedHeap::trace_heap(GCWhen::Type when, GCTracer* gc_tracer) { |
136 const GCHeapSummary& heap_summary = create_heap_summary(); | |
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137 gc_tracer->report_gc_heap_summary(when, heap_summary); |
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138 |
10405 | 139 const MetaspaceSummary& metaspace_summary = create_metaspace_summary(); |
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140 gc_tracer->report_metaspace_summary(when, metaspace_summary); |
10405 | 141 } |
142 | |
143 void CollectedHeap::trace_heap_before_gc(GCTracer* gc_tracer) { | |
144 trace_heap(GCWhen::BeforeGC, gc_tracer); | |
145 } | |
146 | |
147 void CollectedHeap::trace_heap_after_gc(GCTracer* gc_tracer) { | |
148 trace_heap(GCWhen::AfterGC, gc_tracer); | |
149 } | |
150 | |
0 | 151 // Memory state functions. |
152 | |
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153 |
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154 CollectedHeap::CollectedHeap() : _n_par_threads(0) |
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155 { |
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156 const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT)); |
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157 const size_t elements_per_word = HeapWordSize / sizeof(jint); |
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158 _filler_array_max_size = align_object_size(filler_array_hdr_size() + |
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159 max_len / elements_per_word); |
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160 |
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161 _barrier_set = NULL; |
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162 _is_gc_active = false; |
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163 _total_collections = _total_full_collections = 0; |
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164 _gc_cause = _gc_lastcause = GCCause::_no_gc; |
0 | 165 NOT_PRODUCT(_promotion_failure_alot_count = 0;) |
166 NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;) | |
167 | |
168 if (UsePerfData) { | |
169 EXCEPTION_MARK; | |
170 | |
171 // create the gc cause jvmstat counters | |
172 _perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause", | |
173 80, GCCause::to_string(_gc_cause), CHECK); | |
174 | |
175 _perf_gc_lastcause = | |
176 PerfDataManager::create_string_variable(SUN_GC, "lastCause", | |
177 80, GCCause::to_string(_gc_lastcause), CHECK); | |
178 } | |
1166 | 179 _defer_initial_card_mark = false; // strengthened by subclass in pre_initialize() below. |
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180 // Create the ring log |
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181 if (LogEvents) { |
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182 _gc_heap_log = new GCHeapLog(); |
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183 } else { |
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184 _gc_heap_log = NULL; |
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185 } |
0 | 186 } |
187 | |
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188 // This interface assumes that it's being called by the |
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189 // vm thread. It collects the heap assuming that the |
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190 // heap lock is already held and that we are executing in |
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191 // the context of the vm thread. |
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192 void CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
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193 assert(Thread::current()->is_VM_thread(), "Precondition#1"); |
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194 assert(Heap_lock->is_locked(), "Precondition#2"); |
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195 GCCauseSetter gcs(this, cause); |
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196 switch (cause) { |
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197 case GCCause::_heap_inspection: |
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198 case GCCause::_heap_dump: |
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199 case GCCause::_metadata_GC_threshold : { |
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200 HandleMark hm; |
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201 do_full_collection(false); // don't clear all soft refs |
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202 break; |
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203 } |
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204 case GCCause::_last_ditch_collection: { |
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205 HandleMark hm; |
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206 do_full_collection(true); // do clear all soft refs |
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207 break; |
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208 } |
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209 default: |
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210 ShouldNotReachHere(); // Unexpected use of this function |
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211 } |
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212 } |
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213 |
1166 | 214 void CollectedHeap::pre_initialize() { |
215 // Used for ReduceInitialCardMarks (when COMPILER2 is used); | |
216 // otherwise remains unused. | |
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217 #ifdef COMPILER2 |
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218 _defer_initial_card_mark = ReduceInitialCardMarks && can_elide_tlab_store_barriers() |
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219 && (DeferInitialCardMark || card_mark_must_follow_store()); |
1166 | 220 #else |
221 assert(_defer_initial_card_mark == false, "Who would set it?"); | |
222 #endif | |
223 } | |
0 | 224 |
225 #ifndef PRODUCT | |
226 void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) { | |
227 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
228 for (size_t slot = 0; slot < size; slot += 1) { | |
229 assert((*(intptr_t*) (addr + slot)) != ((intptr_t) badHeapWordVal), | |
230 "Found badHeapWordValue in post-allocation check"); | |
231 } | |
232 } | |
233 } | |
234 | |
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235 void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) { |
0 | 236 if (CheckMemoryInitialization && ZapUnusedHeapArea) { |
237 for (size_t slot = 0; slot < size; slot += 1) { | |
238 assert((*(intptr_t*) (addr + slot)) == ((intptr_t) badHeapWordVal), | |
239 "Found non badHeapWordValue in pre-allocation check"); | |
240 } | |
241 } | |
242 } | |
243 #endif // PRODUCT | |
244 | |
245 #ifdef ASSERT | |
246 void CollectedHeap::check_for_valid_allocation_state() { | |
247 Thread *thread = Thread::current(); | |
248 // How to choose between a pending exception and a potential | |
249 // OutOfMemoryError? Don't allow pending exceptions. | |
250 // This is a VM policy failure, so how do we exhaustively test it? | |
251 assert(!thread->has_pending_exception(), | |
252 "shouldn't be allocating with pending exception"); | |
253 if (StrictSafepointChecks) { | |
254 assert(thread->allow_allocation(), | |
255 "Allocation done by thread for which allocation is blocked " | |
256 "by No_Allocation_Verifier!"); | |
257 // Allocation of an oop can always invoke a safepoint, | |
258 // hence, the true argument | |
259 thread->check_for_valid_safepoint_state(true); | |
260 } | |
261 } | |
262 #endif | |
263 | |
10405 | 264 HeapWord* CollectedHeap::allocate_from_tlab_slow(KlassHandle klass, Thread* thread, size_t size) { |
0 | 265 |
266 // Retain tlab and allocate object in shared space if | |
267 // the amount free in the tlab is too large to discard. | |
268 if (thread->tlab().free() > thread->tlab().refill_waste_limit()) { | |
269 thread->tlab().record_slow_allocation(size); | |
270 return NULL; | |
271 } | |
272 | |
273 // Discard tlab and allocate a new one. | |
274 // To minimize fragmentation, the last TLAB may be smaller than the rest. | |
275 size_t new_tlab_size = thread->tlab().compute_size(size); | |
276 | |
277 thread->tlab().clear_before_allocation(); | |
278 | |
279 if (new_tlab_size == 0) { | |
280 return NULL; | |
281 } | |
282 | |
283 // Allocate a new TLAB... | |
284 HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size); | |
285 if (obj == NULL) { | |
286 return NULL; | |
287 } | |
10405 | 288 |
289 AllocTracer::send_allocation_in_new_tlab_event(klass, new_tlab_size * HeapWordSize, size * HeapWordSize); | |
290 | |
0 | 291 if (ZeroTLAB) { |
292 // ..and clear it. | |
293 Copy::zero_to_words(obj, new_tlab_size); | |
294 } else { | |
3892 | 295 // ...and zap just allocated object. |
296 #ifdef ASSERT | |
297 // Skip mangling the space corresponding to the object header to | |
298 // ensure that the returned space is not considered parsable by | |
299 // any concurrent GC thread. | |
300 size_t hdr_size = oopDesc::header_size(); | |
301 Copy::fill_to_words(obj + hdr_size, new_tlab_size - hdr_size, badHeapWordVal); | |
302 #endif // ASSERT | |
0 | 303 } |
304 thread->tlab().fill(obj, obj + size, new_tlab_size); | |
305 return obj; | |
306 } | |
307 | |
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308 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) { |
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309 MemRegion deferred = thread->deferred_card_mark(); |
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310 if (!deferred.is_empty()) { |
1166 | 311 assert(_defer_initial_card_mark, "Otherwise should be empty"); |
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312 { |
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313 // Verify that the storage points to a parsable object in heap |
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314 DEBUG_ONLY(oop old_obj = oop(deferred.start());) |
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315 assert(is_in(old_obj), "Not in allocated heap"); |
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316 assert(!can_elide_initializing_store_barrier(old_obj), |
1166 | 317 "Else should have been filtered in new_store_pre_barrier()"); |
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318 assert(old_obj->is_oop(true), "Not an oop"); |
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319 assert(deferred.word_size() == (size_t)(old_obj->size()), |
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320 "Mismatch: multiple objects?"); |
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321 } |
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322 BarrierSet* bs = barrier_set(); |
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323 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); |
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324 bs->write_region(deferred); |
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325 // "Clear" the deferred_card_mark field |
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326 thread->set_deferred_card_mark(MemRegion()); |
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327 } |
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328 assert(thread->deferred_card_mark().is_empty(), "invariant"); |
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329 } |
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330 |
17727 | 331 size_t CollectedHeap::max_tlab_size() const { |
332 // TLABs can't be bigger than we can fill with a int[Integer.MAX_VALUE]. | |
333 // This restriction could be removed by enabling filling with multiple arrays. | |
334 // If we compute that the reasonable way as | |
335 // header_size + ((sizeof(jint) * max_jint) / HeapWordSize) | |
336 // we'll overflow on the multiply, so we do the divide first. | |
337 // We actually lose a little by dividing first, | |
338 // but that just makes the TLAB somewhat smaller than the biggest array, | |
339 // which is fine, since we'll be able to fill that. | |
340 size_t max_int_size = typeArrayOopDesc::header_size(T_INT) + | |
341 sizeof(jint) * | |
342 ((juint) max_jint / (size_t) HeapWordSize); | |
343 return align_size_down(max_int_size, MinObjAlignment); | |
344 } | |
345 | |
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346 // Helper for ReduceInitialCardMarks. For performance, |
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347 // compiled code may elide card-marks for initializing stores |
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348 // to a newly allocated object along the fast-path. We |
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349 // compensate for such elided card-marks as follows: |
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350 // (a) Generational, non-concurrent collectors, such as |
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351 // GenCollectedHeap(ParNew,DefNew,Tenured) and |
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352 // ParallelScavengeHeap(ParallelGC, ParallelOldGC) |
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353 // need the card-mark if and only if the region is |
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354 // in the old gen, and do not care if the card-mark |
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355 // succeeds or precedes the initializing stores themselves, |
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356 // so long as the card-mark is completed before the next |
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357 // scavenge. For all these cases, we can do a card mark |
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358 // at the point at which we do a slow path allocation |
1166 | 359 // in the old gen, i.e. in this call. |
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360 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires |
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361 // in addition that the card-mark for an old gen allocated |
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362 // object strictly follow any associated initializing stores. |
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363 // In these cases, the memRegion remembered below is |
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364 // used to card-mark the entire region either just before the next |
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365 // slow-path allocation by this thread or just before the next scavenge or |
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366 // CMS-associated safepoint, whichever of these events happens first. |
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367 // (The implicit assumption is that the object has been fully |
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368 // initialized by this point, a fact that we assert when doing the |
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369 // card-mark.) |
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370 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a |
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371 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is |
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372 // is used to remember the pre-value of any store. Initializing |
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373 // stores will not need this barrier, so we need not worry about |
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374 // compensating for the missing pre-barrier here. Turning now |
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375 // to the post-barrier, we note that G1 needs a RS update barrier |
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376 // which simply enqueues a (sequence of) dirty cards which may |
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377 // optionally be refined by the concurrent update threads. Note |
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378 // that this barrier need only be applied to a non-young write, |
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379 // but, like in CMS, because of the presence of concurrent refinement |
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380 // (much like CMS' precleaning), must strictly follow the oop-store. |
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381 // Thus, using the same protocol for maintaining the intended |
1166 | 382 // invariants turns out, serendepitously, to be the same for both |
383 // G1 and CMS. | |
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384 // |
1166 | 385 // For any future collector, this code should be reexamined with |
386 // that specific collector in mind, and the documentation above suitably | |
387 // extended and updated. | |
388 oop CollectedHeap::new_store_pre_barrier(JavaThread* thread, oop new_obj) { | |
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389 // If a previous card-mark was deferred, flush it now. |
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390 flush_deferred_store_barrier(thread); |
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391 if (can_elide_initializing_store_barrier(new_obj)) { |
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392 // The deferred_card_mark region should be empty |
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393 // following the flush above. |
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394 assert(thread->deferred_card_mark().is_empty(), "Error"); |
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395 } else { |
1166 | 396 MemRegion mr((HeapWord*)new_obj, new_obj->size()); |
397 assert(!mr.is_empty(), "Error"); | |
398 if (_defer_initial_card_mark) { | |
399 // Defer the card mark | |
400 thread->set_deferred_card_mark(mr); | |
401 } else { | |
402 // Do the card mark | |
403 BarrierSet* bs = barrier_set(); | |
404 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); | |
405 bs->write_region(mr); | |
406 } | |
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407 } |
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408 return new_obj; |
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409 } |
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410 |
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411 size_t CollectedHeap::filler_array_hdr_size() { |
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412 return size_t(align_object_offset(arrayOopDesc::header_size(T_INT))); // align to Long |
481
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413 } |
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414 |
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415 size_t CollectedHeap::filler_array_min_size() { |
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416 return align_object_size(filler_array_hdr_size()); // align to MinObjAlignment |
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417 } |
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418 |
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419 #ifdef ASSERT |
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420 void CollectedHeap::fill_args_check(HeapWord* start, size_t words) |
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421 { |
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422 assert(words >= min_fill_size(), "too small to fill"); |
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423 assert(words % MinObjAlignment == 0, "unaligned size"); |
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424 assert(Universe::heap()->is_in_reserved(start), "not in heap"); |
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425 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap"); |
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426 } |
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427 |
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428 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap) |
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429 { |
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430 if (ZapFillerObjects && zap) { |
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431 Copy::fill_to_words(start + filler_array_hdr_size(), |
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432 words - filler_array_hdr_size(), 0XDEAFBABE); |
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433 } |
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434 } |
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435 #endif // ASSERT |
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436 |
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437 void |
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438 CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap) |
481
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439 { |
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440 assert(words >= filler_array_min_size(), "too small for an array"); |
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441 assert(words <= filler_array_max_size(), "too big for a single object"); |
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442 |
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443 const size_t payload_size = words - filler_array_hdr_size(); |
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444 const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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445 assert((int)len >= 0, err_msg("size too large " SIZE_FORMAT " becomes %d", words, (int)len)); |
481
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446 |
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447 // Set the length first for concurrent GC. |
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448 ((arrayOop)start)->set_length((int)len); |
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449 post_allocation_setup_common(Universe::intArrayKlassObj(), start); |
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450 DEBUG_ONLY(zap_filler_array(start, words, zap);) |
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451 } |
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452 |
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453 void |
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454 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap) |
481
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455 { |
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456 assert(words <= filler_array_max_size(), "too big for a single object"); |
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457 |
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458 if (words >= filler_array_min_size()) { |
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459 fill_with_array(start, words, zap); |
481
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460 } else if (words > 0) { |
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461 assert(words == min_fill_size(), "unaligned size"); |
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462 post_allocation_setup_common(SystemDictionary::Object_klass(), start); |
481
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463 } |
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464 } |
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465 |
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466 void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap) |
481
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467 { |
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468 DEBUG_ONLY(fill_args_check(start, words);) |
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469 HandleMark hm; // Free handles before leaving. |
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470 fill_with_object_impl(start, words, zap); |
481
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471 } |
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472 |
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473 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap) |
481
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474 { |
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475 DEBUG_ONLY(fill_args_check(start, words);) |
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476 HandleMark hm; // Free handles before leaving. |
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477 |
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478 #ifdef _LP64 |
481
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479 // A single array can fill ~8G, so multiple objects are needed only in 64-bit. |
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480 // First fill with arrays, ensuring that any remaining space is big enough to |
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481 // fill. The remainder is filled with a single object. |
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482 const size_t min = min_fill_size(); |
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483 const size_t max = filler_array_max_size(); |
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484 while (words > max) { |
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485 const size_t cur = words - max >= min ? max : max - min; |
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486 fill_with_array(start, cur, zap); |
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487 start += cur; |
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488 words -= cur; |
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489 } |
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490 #endif |
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491 |
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492 fill_with_object_impl(start, words, zap); |
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493 } |
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494 |
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495 void CollectedHeap::post_initialize() { |
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496 collector_policy()->post_heap_initialize(); |
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497 } |
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498 |
0 | 499 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { |
500 guarantee(false, "thread-local allocation buffers not supported"); | |
501 return NULL; | |
502 } | |
503 | |
504 void CollectedHeap::ensure_parsability(bool retire_tlabs) { | |
505 // The second disjunct in the assertion below makes a concession | |
506 // for the start-up verification done while the VM is being | |
507 // created. Callers be careful that you know that mutators | |
508 // aren't going to interfere -- for instance, this is permissible | |
509 // if we are still single-threaded and have either not yet | |
510 // started allocating (nothing much to verify) or we have | |
511 // started allocating but are now a full-fledged JavaThread | |
512 // (and have thus made our TLAB's) available for filling. | |
513 assert(SafepointSynchronize::is_at_safepoint() || | |
514 !is_init_completed(), | |
515 "Should only be called at a safepoint or at start-up" | |
516 " otherwise concurrent mutator activity may make heap " | |
517 " unparsable again"); | |
1166 | 518 const bool use_tlab = UseTLAB; |
519 const bool deferred = _defer_initial_card_mark; | |
520 // The main thread starts allocating via a TLAB even before it | |
521 // has added itself to the threads list at vm boot-up. | |
522 assert(!use_tlab || Threads::first() != NULL, | |
523 "Attempt to fill tlabs before main thread has been added" | |
524 " to threads list is doomed to failure!"); | |
525 for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
526 if (use_tlab) thread->tlab().make_parsable(retire_tlabs); | |
527 #ifdef COMPILER2 | |
528 // The deferred store barriers must all have been flushed to the | |
529 // card-table (or other remembered set structure) before GC starts | |
530 // processing the card-table (or other remembered set). | |
531 if (deferred) flush_deferred_store_barrier(thread); | |
532 #else | |
533 assert(!deferred, "Should be false"); | |
534 assert(thread->deferred_card_mark().is_empty(), "Should be empty"); | |
535 #endif | |
0 | 536 } |
537 } | |
538 | |
539 void CollectedHeap::accumulate_statistics_all_tlabs() { | |
540 if (UseTLAB) { | |
541 assert(SafepointSynchronize::is_at_safepoint() || | |
542 !is_init_completed(), | |
543 "should only accumulate statistics on tlabs at safepoint"); | |
544 | |
545 ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); | |
546 } | |
547 } | |
548 | |
549 void CollectedHeap::resize_all_tlabs() { | |
550 if (UseTLAB) { | |
551 assert(SafepointSynchronize::is_at_safepoint() || | |
552 !is_init_completed(), | |
553 "should only resize tlabs at safepoint"); | |
554 | |
555 ThreadLocalAllocBuffer::resize_all_tlabs(); | |
556 } | |
557 } | |
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558 |
10405 | 559 void CollectedHeap::pre_full_gc_dump(GCTimer* timer) { |
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560 if (HeapDumpBeforeFullGC) { |
10405 | 561 GCTraceTime tt("Heap Dump (before full gc): ", PrintGCDetails, false, timer); |
615
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562 // We are doing a "major" collection and a heap dump before |
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563 // major collection has been requested. |
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564 HeapDumper::dump_heap(); |
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565 } |
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566 if (PrintClassHistogramBeforeFullGC) { |
10405 | 567 GCTraceTime tt("Class Histogram (before full gc): ", PrintGCDetails, true, timer); |
568 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */); | |
615
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569 inspector.doit(); |
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570 } |
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571 } |
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572 |
10405 | 573 void CollectedHeap::post_full_gc_dump(GCTimer* timer) { |
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574 if (HeapDumpAfterFullGC) { |
10405 | 575 GCTraceTime tt("Heap Dump (after full gc): ", PrintGCDetails, false, timer); |
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576 HeapDumper::dump_heap(); |
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577 } |
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578 if (PrintClassHistogramAfterFullGC) { |
10405 | 579 GCTraceTime tt("Class Histogram (after full gc): ", PrintGCDetails, true, timer); |
580 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */); | |
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581 inspector.doit(); |
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582 } |
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583 } |
4009 | 584 |
4708 | 585 /////////////// Unit tests /////////////// |
586 | |
587 #ifndef PRODUCT | |
588 void CollectedHeap::test_is_in() { | |
589 CollectedHeap* heap = Universe::heap(); | |
590 | |
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591 uintptr_t epsilon = (uintptr_t) MinObjAlignment; |
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592 uintptr_t heap_start = (uintptr_t) heap->_reserved.start(); |
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593 uintptr_t heap_end = (uintptr_t) heap->_reserved.end(); |
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594 |
4708 | 595 // Test that NULL is not in the heap. |
596 assert(!heap->is_in(NULL), "NULL is unexpectedly in the heap"); | |
597 | |
598 // Test that a pointer to before the heap start is reported as outside the heap. | |
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599 assert(heap_start >= ((uintptr_t)NULL + epsilon), "sanity"); |
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600 void* before_heap = (void*)(heap_start - epsilon); |
4708 | 601 assert(!heap->is_in(before_heap), |
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602 err_msg("before_heap: " PTR_FORMAT " is unexpectedly in the heap", p2i(before_heap))); |
4708 | 603 |
604 // Test that a pointer to after the heap end is reported as outside the heap. | |
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605 assert(heap_end <= ((uintptr_t)-1 - epsilon), "sanity"); |
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606 void* after_heap = (void*)(heap_end + epsilon); |
4708 | 607 assert(!heap->is_in(after_heap), |
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17883
diff
changeset
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608 err_msg("after_heap: " PTR_FORMAT " is unexpectedly in the heap", p2i(after_heap))); |
4708 | 609 } |
610 #endif |