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annotate src/share/vm/gc_interface/collectedHeap.cpp @ 11722:ff05c78a7f64
use time passed to decide what methods to compile or inline
author | Christian Wirth <christian.wirth@oracle.com> |
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date | Thu, 19 Sep 2013 10:36:56 +0200 |
parents | 27c53c9f3a7e |
children | 5888334c9c24 c4af81d4fcc3 |
rev | line source |
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0 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/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( | |
11116 | 88 MetaspaceAux::allocated_capacity_bytes(), |
89 MetaspaceAux::allocated_used_bytes(), | |
10405 | 90 MetaspaceAux::reserved_in_bytes()); |
91 const MetaspaceSizes data_space( | |
11116 | 92 MetaspaceAux::allocated_capacity_bytes(Metaspace::NonClassType), |
93 MetaspaceAux::allocated_used_bytes(Metaspace::NonClassType), | |
10405 | 94 MetaspaceAux::reserved_in_bytes(Metaspace::NonClassType)); |
95 const MetaspaceSizes class_space( | |
11116 | 96 MetaspaceAux::allocated_capacity_bytes(Metaspace::ClassType), |
97 MetaspaceAux::allocated_used_bytes(Metaspace::ClassType), | |
10405 | 98 MetaspaceAux::reserved_in_bytes(Metaspace::ClassType)); |
99 | |
100 return MetaspaceSummary(meta_space, data_space, class_space); | |
101 } | |
102 | |
103 void CollectedHeap::print_heap_before_gc() { | |
104 if (PrintHeapAtGC) { | |
105 Universe::print_heap_before_gc(); | |
106 } | |
107 if (_gc_heap_log != NULL) { | |
108 _gc_heap_log->log_heap_before(); | |
109 } | |
110 } | |
111 | |
112 void CollectedHeap::print_heap_after_gc() { | |
113 if (PrintHeapAtGC) { | |
114 Universe::print_heap_after_gc(); | |
115 } | |
116 if (_gc_heap_log != NULL) { | |
117 _gc_heap_log->log_heap_after(); | |
118 } | |
119 } | |
120 | |
121 void CollectedHeap::trace_heap(GCWhen::Type when, GCTracer* gc_tracer) { | |
122 const GCHeapSummary& heap_summary = create_heap_summary(); | |
123 const MetaspaceSummary& metaspace_summary = create_metaspace_summary(); | |
124 gc_tracer->report_gc_heap_summary(when, heap_summary, metaspace_summary); | |
125 } | |
126 | |
127 void CollectedHeap::trace_heap_before_gc(GCTracer* gc_tracer) { | |
128 trace_heap(GCWhen::BeforeGC, gc_tracer); | |
129 } | |
130 | |
131 void CollectedHeap::trace_heap_after_gc(GCTracer* gc_tracer) { | |
132 trace_heap(GCWhen::AfterGC, gc_tracer); | |
133 } | |
134 | |
0 | 135 // Memory state functions. |
136 | |
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137 |
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138 CollectedHeap::CollectedHeap() : _n_par_threads(0) |
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139 { |
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140 const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT)); |
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141 const size_t elements_per_word = HeapWordSize / sizeof(jint); |
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142 _filler_array_max_size = align_object_size(filler_array_hdr_size() + |
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143 max_len / elements_per_word); |
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144 |
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145 _barrier_set = NULL; |
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146 _is_gc_active = false; |
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147 _total_collections = _total_full_collections = 0; |
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148 _gc_cause = _gc_lastcause = GCCause::_no_gc; |
0 | 149 NOT_PRODUCT(_promotion_failure_alot_count = 0;) |
150 NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;) | |
151 | |
152 if (UsePerfData) { | |
153 EXCEPTION_MARK; | |
154 | |
155 // create the gc cause jvmstat counters | |
156 _perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause", | |
157 80, GCCause::to_string(_gc_cause), CHECK); | |
158 | |
159 _perf_gc_lastcause = | |
160 PerfDataManager::create_string_variable(SUN_GC, "lastCause", | |
161 80, GCCause::to_string(_gc_lastcause), CHECK); | |
162 } | |
1166 | 163 _defer_initial_card_mark = false; // strengthened by subclass in pre_initialize() below. |
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164 // Create the ring log |
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165 if (LogEvents) { |
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166 _gc_heap_log = new GCHeapLog(); |
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167 } else { |
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168 _gc_heap_log = NULL; |
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169 } |
0 | 170 } |
171 | |
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172 // This interface assumes that it's being called by the |
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173 // vm thread. It collects the heap assuming that the |
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174 // heap lock is already held and that we are executing in |
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175 // the context of the vm thread. |
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176 void CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
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177 assert(Thread::current()->is_VM_thread(), "Precondition#1"); |
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178 assert(Heap_lock->is_locked(), "Precondition#2"); |
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179 GCCauseSetter gcs(this, cause); |
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180 switch (cause) { |
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181 case GCCause::_heap_inspection: |
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182 case GCCause::_heap_dump: |
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183 case GCCause::_metadata_GC_threshold : { |
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184 HandleMark hm; |
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185 do_full_collection(false); // don't clear all soft refs |
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186 break; |
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187 } |
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188 case GCCause::_last_ditch_collection: { |
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189 HandleMark hm; |
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190 do_full_collection(true); // do clear all soft refs |
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191 break; |
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192 } |
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193 default: |
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194 ShouldNotReachHere(); // Unexpected use of this function |
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195 } |
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196 } |
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197 MetaWord* CollectedHeap::satisfy_failed_metadata_allocation( |
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198 ClassLoaderData* loader_data, |
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199 size_t size, Metaspace::MetadataType mdtype) { |
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200 return collector_policy()->satisfy_failed_metadata_allocation(loader_data, size, mdtype); |
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201 } |
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202 |
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203 |
1166 | 204 void CollectedHeap::pre_initialize() { |
205 // Used for ReduceInitialCardMarks (when COMPILER2 is used); | |
206 // otherwise remains unused. | |
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207 #ifdef COMPILER2 |
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208 _defer_initial_card_mark = ReduceInitialCardMarks && can_elide_tlab_store_barriers() |
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209 && (DeferInitialCardMark || card_mark_must_follow_store()); |
1166 | 210 #else |
211 assert(_defer_initial_card_mark == false, "Who would set it?"); | |
212 #endif | |
213 } | |
0 | 214 |
215 #ifndef PRODUCT | |
216 void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) { | |
217 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
218 for (size_t slot = 0; slot < size; slot += 1) { | |
219 assert((*(intptr_t*) (addr + slot)) != ((intptr_t) badHeapWordVal), | |
220 "Found badHeapWordValue in post-allocation check"); | |
221 } | |
222 } | |
223 } | |
224 | |
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225 void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) { |
0 | 226 if (CheckMemoryInitialization && ZapUnusedHeapArea) { |
227 for (size_t slot = 0; slot < size; slot += 1) { | |
228 assert((*(intptr_t*) (addr + slot)) == ((intptr_t) badHeapWordVal), | |
229 "Found non badHeapWordValue in pre-allocation check"); | |
230 } | |
231 } | |
232 } | |
233 #endif // PRODUCT | |
234 | |
235 #ifdef ASSERT | |
236 void CollectedHeap::check_for_valid_allocation_state() { | |
237 Thread *thread = Thread::current(); | |
238 // How to choose between a pending exception and a potential | |
239 // OutOfMemoryError? Don't allow pending exceptions. | |
240 // This is a VM policy failure, so how do we exhaustively test it? | |
241 assert(!thread->has_pending_exception(), | |
242 "shouldn't be allocating with pending exception"); | |
243 if (StrictSafepointChecks) { | |
244 assert(thread->allow_allocation(), | |
245 "Allocation done by thread for which allocation is blocked " | |
246 "by No_Allocation_Verifier!"); | |
247 // Allocation of an oop can always invoke a safepoint, | |
248 // hence, the true argument | |
249 thread->check_for_valid_safepoint_state(true); | |
250 } | |
251 } | |
252 #endif | |
253 | |
10405 | 254 HeapWord* CollectedHeap::allocate_from_tlab_slow(KlassHandle klass, Thread* thread, size_t size) { |
0 | 255 |
256 // Retain tlab and allocate object in shared space if | |
257 // the amount free in the tlab is too large to discard. | |
258 if (thread->tlab().free() > thread->tlab().refill_waste_limit()) { | |
259 thread->tlab().record_slow_allocation(size); | |
260 return NULL; | |
261 } | |
262 | |
263 // Discard tlab and allocate a new one. | |
264 // To minimize fragmentation, the last TLAB may be smaller than the rest. | |
265 size_t new_tlab_size = thread->tlab().compute_size(size); | |
266 | |
267 thread->tlab().clear_before_allocation(); | |
268 | |
269 if (new_tlab_size == 0) { | |
270 return NULL; | |
271 } | |
272 | |
273 // Allocate a new TLAB... | |
274 HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size); | |
275 if (obj == NULL) { | |
276 return NULL; | |
277 } | |
10405 | 278 |
279 AllocTracer::send_allocation_in_new_tlab_event(klass, new_tlab_size * HeapWordSize, size * HeapWordSize); | |
280 | |
0 | 281 if (ZeroTLAB) { |
282 // ..and clear it. | |
283 Copy::zero_to_words(obj, new_tlab_size); | |
284 } else { | |
3892 | 285 // ...and zap just allocated object. |
286 #ifdef ASSERT | |
287 // Skip mangling the space corresponding to the object header to | |
288 // ensure that the returned space is not considered parsable by | |
289 // any concurrent GC thread. | |
290 size_t hdr_size = oopDesc::header_size(); | |
291 Copy::fill_to_words(obj + hdr_size, new_tlab_size - hdr_size, badHeapWordVal); | |
292 #endif // ASSERT | |
0 | 293 } |
294 thread->tlab().fill(obj, obj + size, new_tlab_size); | |
295 return obj; | |
296 } | |
297 | |
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298 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) { |
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299 MemRegion deferred = thread->deferred_card_mark(); |
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300 if (!deferred.is_empty()) { |
1166 | 301 assert(_defer_initial_card_mark, "Otherwise should be empty"); |
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302 { |
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303 // Verify that the storage points to a parsable object in heap |
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304 DEBUG_ONLY(oop old_obj = oop(deferred.start());) |
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305 assert(is_in(old_obj), "Not in allocated heap"); |
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306 assert(!can_elide_initializing_store_barrier(old_obj), |
1166 | 307 "Else should have been filtered in new_store_pre_barrier()"); |
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308 assert(old_obj->is_oop(true), "Not an oop"); |
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309 assert(deferred.word_size() == (size_t)(old_obj->size()), |
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310 "Mismatch: multiple objects?"); |
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311 } |
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312 BarrierSet* bs = barrier_set(); |
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313 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); |
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314 bs->write_region(deferred); |
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315 // "Clear" the deferred_card_mark field |
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316 thread->set_deferred_card_mark(MemRegion()); |
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317 } |
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318 assert(thread->deferred_card_mark().is_empty(), "invariant"); |
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319 } |
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320 |
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321 // Helper for ReduceInitialCardMarks. For performance, |
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322 // compiled code may elide card-marks for initializing stores |
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323 // to a newly allocated object along the fast-path. We |
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324 // compensate for such elided card-marks as follows: |
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325 // (a) Generational, non-concurrent collectors, such as |
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326 // GenCollectedHeap(ParNew,DefNew,Tenured) and |
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327 // ParallelScavengeHeap(ParallelGC, ParallelOldGC) |
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328 // need the card-mark if and only if the region is |
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329 // in the old gen, and do not care if the card-mark |
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330 // succeeds or precedes the initializing stores themselves, |
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331 // so long as the card-mark is completed before the next |
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332 // scavenge. For all these cases, we can do a card mark |
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333 // at the point at which we do a slow path allocation |
1166 | 334 // in the old gen, i.e. in this call. |
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335 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires |
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336 // in addition that the card-mark for an old gen allocated |
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337 // object strictly follow any associated initializing stores. |
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338 // In these cases, the memRegion remembered below is |
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339 // used to card-mark the entire region either just before the next |
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340 // slow-path allocation by this thread or just before the next scavenge or |
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341 // CMS-associated safepoint, whichever of these events happens first. |
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342 // (The implicit assumption is that the object has been fully |
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343 // initialized by this point, a fact that we assert when doing the |
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344 // card-mark.) |
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345 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a |
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346 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is |
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347 // is used to remember the pre-value of any store. Initializing |
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348 // stores will not need this barrier, so we need not worry about |
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349 // compensating for the missing pre-barrier here. Turning now |
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350 // to the post-barrier, we note that G1 needs a RS update barrier |
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351 // which simply enqueues a (sequence of) dirty cards which may |
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352 // optionally be refined by the concurrent update threads. Note |
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353 // that this barrier need only be applied to a non-young write, |
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354 // but, like in CMS, because of the presence of concurrent refinement |
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355 // (much like CMS' precleaning), must strictly follow the oop-store. |
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356 // Thus, using the same protocol for maintaining the intended |
1166 | 357 // invariants turns out, serendepitously, to be the same for both |
358 // G1 and CMS. | |
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359 // |
1166 | 360 // For any future collector, this code should be reexamined with |
361 // that specific collector in mind, and the documentation above suitably | |
362 // extended and updated. | |
363 oop CollectedHeap::new_store_pre_barrier(JavaThread* thread, oop new_obj) { | |
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364 // If a previous card-mark was deferred, flush it now. |
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365 flush_deferred_store_barrier(thread); |
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366 if (can_elide_initializing_store_barrier(new_obj)) { |
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367 // The deferred_card_mark region should be empty |
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368 // following the flush above. |
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369 assert(thread->deferred_card_mark().is_empty(), "Error"); |
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370 } else { |
1166 | 371 MemRegion mr((HeapWord*)new_obj, new_obj->size()); |
372 assert(!mr.is_empty(), "Error"); | |
373 if (_defer_initial_card_mark) { | |
374 // Defer the card mark | |
375 thread->set_deferred_card_mark(mr); | |
376 } else { | |
377 // Do the card mark | |
378 BarrierSet* bs = barrier_set(); | |
379 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); | |
380 bs->write_region(mr); | |
381 } | |
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382 } |
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383 return new_obj; |
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384 } |
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385 |
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386 size_t CollectedHeap::filler_array_hdr_size() { |
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387 return size_t(align_object_offset(arrayOopDesc::header_size(T_INT))); // align to Long |
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388 } |
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389 |
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390 size_t CollectedHeap::filler_array_min_size() { |
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391 return align_object_size(filler_array_hdr_size()); // align to MinObjAlignment |
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392 } |
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393 |
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394 #ifdef ASSERT |
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395 void CollectedHeap::fill_args_check(HeapWord* start, size_t words) |
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396 { |
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397 assert(words >= min_fill_size(), "too small to fill"); |
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398 assert(words % MinObjAlignment == 0, "unaligned size"); |
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399 assert(Universe::heap()->is_in_reserved(start), "not in heap"); |
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400 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap"); |
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401 } |
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402 |
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403 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap) |
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404 { |
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405 if (ZapFillerObjects && zap) { |
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406 Copy::fill_to_words(start + filler_array_hdr_size(), |
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407 words - filler_array_hdr_size(), 0XDEAFBABE); |
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408 } |
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409 } |
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410 #endif // ASSERT |
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411 |
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412 void |
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413 CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap) |
481
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414 { |
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415 assert(words >= filler_array_min_size(), "too small for an array"); |
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416 assert(words <= filler_array_max_size(), "too big for a single object"); |
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417 |
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418 const size_t payload_size = words - filler_array_hdr_size(); |
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419 const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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420 assert((int)len >= 0, err_msg("size too large " SIZE_FORMAT " becomes %d", words, (int)len)); |
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421 |
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422 // Set the length first for concurrent GC. |
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423 ((arrayOop)start)->set_length((int)len); |
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424 post_allocation_setup_common(Universe::intArrayKlassObj(), start); |
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425 DEBUG_ONLY(zap_filler_array(start, words, zap);) |
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426 } |
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427 |
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428 void |
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429 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap) |
481
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430 { |
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431 assert(words <= filler_array_max_size(), "too big for a single object"); |
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432 |
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433 if (words >= filler_array_min_size()) { |
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434 fill_with_array(start, words, zap); |
481
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435 } else if (words > 0) { |
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436 assert(words == min_fill_size(), "unaligned size"); |
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437 post_allocation_setup_common(SystemDictionary::Object_klass(), start); |
481
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438 } |
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439 } |
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440 |
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441 void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap) |
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442 { |
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443 DEBUG_ONLY(fill_args_check(start, words);) |
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444 HandleMark hm; // Free handles before leaving. |
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445 fill_with_object_impl(start, words, zap); |
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446 } |
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447 |
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448 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap) |
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449 { |
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450 DEBUG_ONLY(fill_args_check(start, words);) |
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451 HandleMark hm; // Free handles before leaving. |
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452 |
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453 #ifdef _LP64 |
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454 // A single array can fill ~8G, so multiple objects are needed only in 64-bit. |
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455 // First fill with arrays, ensuring that any remaining space is big enough to |
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456 // fill. The remainder is filled with a single object. |
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457 const size_t min = min_fill_size(); |
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458 const size_t max = filler_array_max_size(); |
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459 while (words > max) { |
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460 const size_t cur = words - max >= min ? max : max - min; |
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461 fill_with_array(start, cur, zap); |
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462 start += cur; |
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463 words -= cur; |
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464 } |
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465 #endif |
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466 |
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467 fill_with_object_impl(start, words, zap); |
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468 } |
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469 |
0 | 470 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { |
471 guarantee(false, "thread-local allocation buffers not supported"); | |
472 return NULL; | |
473 } | |
474 | |
475 void CollectedHeap::ensure_parsability(bool retire_tlabs) { | |
476 // The second disjunct in the assertion below makes a concession | |
477 // for the start-up verification done while the VM is being | |
478 // created. Callers be careful that you know that mutators | |
479 // aren't going to interfere -- for instance, this is permissible | |
480 // if we are still single-threaded and have either not yet | |
481 // started allocating (nothing much to verify) or we have | |
482 // started allocating but are now a full-fledged JavaThread | |
483 // (and have thus made our TLAB's) available for filling. | |
484 assert(SafepointSynchronize::is_at_safepoint() || | |
485 !is_init_completed(), | |
486 "Should only be called at a safepoint or at start-up" | |
487 " otherwise concurrent mutator activity may make heap " | |
488 " unparsable again"); | |
1166 | 489 const bool use_tlab = UseTLAB; |
490 const bool deferred = _defer_initial_card_mark; | |
491 // The main thread starts allocating via a TLAB even before it | |
492 // has added itself to the threads list at vm boot-up. | |
493 assert(!use_tlab || Threads::first() != NULL, | |
494 "Attempt to fill tlabs before main thread has been added" | |
495 " to threads list is doomed to failure!"); | |
496 for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
497 if (use_tlab) thread->tlab().make_parsable(retire_tlabs); | |
498 #ifdef COMPILER2 | |
499 // The deferred store barriers must all have been flushed to the | |
500 // card-table (or other remembered set structure) before GC starts | |
501 // processing the card-table (or other remembered set). | |
502 if (deferred) flush_deferred_store_barrier(thread); | |
503 #else | |
504 assert(!deferred, "Should be false"); | |
505 assert(thread->deferred_card_mark().is_empty(), "Should be empty"); | |
506 #endif | |
0 | 507 } |
508 } | |
509 | |
510 void CollectedHeap::accumulate_statistics_all_tlabs() { | |
511 if (UseTLAB) { | |
512 assert(SafepointSynchronize::is_at_safepoint() || | |
513 !is_init_completed(), | |
514 "should only accumulate statistics on tlabs at safepoint"); | |
515 | |
516 ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); | |
517 } | |
518 } | |
519 | |
520 void CollectedHeap::resize_all_tlabs() { | |
521 if (UseTLAB) { | |
522 assert(SafepointSynchronize::is_at_safepoint() || | |
523 !is_init_completed(), | |
524 "should only resize tlabs at safepoint"); | |
525 | |
526 ThreadLocalAllocBuffer::resize_all_tlabs(); | |
527 } | |
528 } | |
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529 |
10405 | 530 void CollectedHeap::pre_full_gc_dump(GCTimer* timer) { |
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531 if (HeapDumpBeforeFullGC) { |
10405 | 532 GCTraceTime tt("Heap Dump (before full gc): ", PrintGCDetails, false, timer); |
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533 // We are doing a "major" collection and a heap dump before |
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534 // major collection has been requested. |
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535 HeapDumper::dump_heap(); |
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536 } |
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537 if (PrintClassHistogramBeforeFullGC) { |
10405 | 538 GCTraceTime tt("Class Histogram (before full gc): ", PrintGCDetails, true, timer); |
539 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */); | |
615
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540 inspector.doit(); |
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541 } |
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542 } |
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543 |
10405 | 544 void CollectedHeap::post_full_gc_dump(GCTimer* timer) { |
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545 if (HeapDumpAfterFullGC) { |
10405 | 546 GCTraceTime tt("Heap Dump (after full gc): ", PrintGCDetails, false, timer); |
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547 HeapDumper::dump_heap(); |
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548 } |
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549 if (PrintClassHistogramAfterFullGC) { |
10405 | 550 GCTraceTime tt("Class Histogram (after full gc): ", PrintGCDetails, true, timer); |
551 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */); | |
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552 inspector.doit(); |
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553 } |
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554 } |
4009 | 555 |
556 oop CollectedHeap::Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS) { | |
557 debug_only(check_for_valid_allocation_state()); | |
558 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); | |
559 assert(size >= 0, "int won't convert to size_t"); | |
560 HeapWord* obj; | |
561 assert(ScavengeRootsInCode > 0, "must be"); | |
10405 | 562 obj = common_mem_allocate_init(real_klass, size, CHECK_NULL); |
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563 post_allocation_setup_common(klass, obj); |
4009 | 564 assert(Universe::is_bootstrapping() || |
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565 !((oop)obj)->is_array(), "must not be an array"); |
4009 | 566 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); |
567 oop mirror = (oop)obj; | |
568 | |
569 java_lang_Class::set_oop_size(mirror, size); | |
570 | |
571 // Setup indirections | |
572 if (!real_klass.is_null()) { | |
573 java_lang_Class::set_klass(mirror, real_klass()); | |
574 real_klass->set_java_mirror(mirror); | |
575 } | |
576 | |
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577 InstanceMirrorKlass* mk = InstanceMirrorKlass::cast(mirror->klass()); |
4009 | 578 assert(size == mk->instance_size(real_klass), "should have been set"); |
579 | |
580 // notify jvmti and dtrace | |
581 post_allocation_notify(klass, (oop)obj); | |
582 | |
583 return mirror; | |
584 } | |
4708 | 585 |
586 /////////////// Unit tests /////////////// | |
587 | |
588 #ifndef PRODUCT | |
589 void CollectedHeap::test_is_in() { | |
590 CollectedHeap* heap = Universe::heap(); | |
591 | |
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592 uintptr_t epsilon = (uintptr_t) MinObjAlignment; |
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593 uintptr_t heap_start = (uintptr_t) heap->_reserved.start(); |
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594 uintptr_t heap_end = (uintptr_t) heap->_reserved.end(); |
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595 |
4708 | 596 // Test that NULL is not in the heap. |
597 assert(!heap->is_in(NULL), "NULL is unexpectedly in the heap"); | |
598 | |
599 // Test that a pointer to before the heap start is reported as outside the heap. | |
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600 assert(heap_start >= ((uintptr_t)NULL + epsilon), "sanity"); |
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601 void* before_heap = (void*)(heap_start - epsilon); |
4708 | 602 assert(!heap->is_in(before_heap), |
603 err_msg("before_heap: " PTR_FORMAT " is unexpectedly in the heap", before_heap)); | |
604 | |
605 // Test that a pointer to after the heap end is reported as outside the heap. | |
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606 assert(heap_end <= ((uintptr_t)-1 - epsilon), "sanity"); |
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607 void* after_heap = (void*)(heap_end + epsilon); |
4708 | 608 assert(!heap->is_in(after_heap), |
609 err_msg("after_heap: " PTR_FORMAT " is unexpectedly in the heap", after_heap)); | |
610 } | |
611 #endif |