Mercurial > hg > graal-compiler
annotate src/share/vm/memory/sharedHeap.cpp @ 1833:8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
Summary: Associate number of GC workers with the workgang as opposed to the task.
Reviewed-by: johnc, ysr
| author | jmasa |
|---|---|
| date | Mon, 20 Sep 2010 14:38:38 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_sharedHeap.cpp.incl" | |
| 27 | |
| 28 SharedHeap* SharedHeap::_sh; | |
| 29 | |
| 30 // The set of potentially parallel tasks in strong root scanning. | |
| 31 enum SH_process_strong_roots_tasks { | |
| 32 SH_PS_Universe_oops_do, | |
| 33 SH_PS_JNIHandles_oops_do, | |
| 34 SH_PS_ObjectSynchronizer_oops_do, | |
| 35 SH_PS_FlatProfiler_oops_do, | |
| 36 SH_PS_Management_oops_do, | |
| 37 SH_PS_SystemDictionary_oops_do, | |
| 38 SH_PS_jvmti_oops_do, | |
| 39 SH_PS_vmSymbols_oops_do, | |
| 40 SH_PS_SymbolTable_oops_do, | |
| 41 SH_PS_StringTable_oops_do, | |
| 42 SH_PS_CodeCache_oops_do, | |
| 43 // Leave this one last. | |
| 44 SH_PS_NumElements | |
| 45 }; | |
| 46 | |
| 47 SharedHeap::SharedHeap(CollectorPolicy* policy_) : | |
| 48 CollectedHeap(), | |
| 49 _collector_policy(policy_), | |
| 50 _perm_gen(NULL), _rem_set(NULL), | |
| 51 _strong_roots_parity(0), | |
| 52 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), | |
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53 _n_par_threads(0), |
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54 _workers(NULL) |
| 0 | 55 { |
| 56 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 57 vm_exit_during_initialization("Failed necessary allocation."); | |
| 58 } | |
| 59 _sh = this; // ch is static, should be set only once. | |
| 60 if ((UseParNewGC || | |
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61 (UseConcMarkSweepGC && CMSParallelRemarkEnabled) || |
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62 UseG1GC) && |
| 0 | 63 ParallelGCThreads > 0) { |
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64 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, |
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65 /* are_GC_task_threads */true, |
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66 /* are_ConcurrentGC_threads */false); |
| 0 | 67 if (_workers == NULL) { |
| 68 vm_exit_during_initialization("Failed necessary allocation."); | |
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69 } else { |
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70 _workers->initialize_workers(); |
| 0 | 71 } |
| 72 } | |
| 73 } | |
| 74 | |
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75 bool SharedHeap::heap_lock_held_for_gc() { |
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76 Thread* t = Thread::current(); |
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77 return Heap_lock->owned_by_self() |
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78 || ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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79 && _thread_holds_heap_lock_for_gc); |
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80 } |
| 0 | 81 |
| 82 void SharedHeap::set_par_threads(int t) { | |
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83 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); |
| 0 | 84 _n_par_threads = t; |
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85 _process_strong_tasks->set_n_threads(t); |
| 0 | 86 } |
| 87 | |
| 88 class AssertIsPermClosure: public OopClosure { | |
| 89 public: | |
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90 virtual void do_oop(oop* p) { |
| 0 | 91 assert((*p) == NULL || (*p)->is_perm(), "Referent should be perm."); |
| 92 } | |
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93 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
| 0 | 94 }; |
| 95 static AssertIsPermClosure assert_is_perm_closure; | |
| 96 | |
| 97 void SharedHeap::change_strong_roots_parity() { | |
| 98 // Also set the new collection parity. | |
| 99 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, | |
| 100 "Not in range."); | |
| 101 _strong_roots_parity++; | |
| 102 if (_strong_roots_parity == 3) _strong_roots_parity = 1; | |
| 103 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, | |
| 104 "Not in range."); | |
| 105 } | |
| 106 | |
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107 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate) |
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108 : MarkScope(activate) |
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109 { |
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110 if (_active) { |
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111 outer->change_strong_roots_parity(); |
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112 } |
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113 } |
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114 |
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115 SharedHeap::StrongRootsScope::~StrongRootsScope() { |
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116 // nothing particular |
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117 } |
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118 |
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119 void SharedHeap::process_strong_roots(bool activate_scope, |
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120 bool collecting_perm_gen, |
| 0 | 121 ScanningOption so, |
| 122 OopClosure* roots, | |
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123 CodeBlobClosure* code_roots, |
| 0 | 124 OopsInGenClosure* perm_blk) { |
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125 StrongRootsScope srs(this, activate_scope); |
| 0 | 126 // General strong roots. |
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127 assert(_strong_roots_parity != 0, "must have called prologue code"); |
| 0 | 128 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { |
| 129 Universe::oops_do(roots); | |
| 130 ReferenceProcessor::oops_do(roots); | |
| 131 // Consider perm-gen discovered lists to be strong. | |
| 132 perm_gen()->ref_processor()->weak_oops_do(roots); | |
| 133 } | |
| 134 // Global (strong) JNI handles | |
| 135 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) | |
| 136 JNIHandles::oops_do(roots); | |
| 137 // All threads execute this; the individual threads are task groups. | |
| 138 if (ParallelGCThreads > 0) { | |
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139 Threads::possibly_parallel_oops_do(roots, code_roots); |
| 0 | 140 } else { |
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141 Threads::oops_do(roots, code_roots); |
| 0 | 142 } |
| 143 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) | |
| 144 ObjectSynchronizer::oops_do(roots); | |
| 145 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) | |
| 146 FlatProfiler::oops_do(roots); | |
| 147 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) | |
| 148 Management::oops_do(roots); | |
| 149 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) | |
| 150 JvmtiExport::oops_do(roots); | |
| 151 | |
| 152 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { | |
| 153 if (so & SO_AllClasses) { | |
| 154 SystemDictionary::oops_do(roots); | |
| 155 } else | |
| 156 if (so & SO_SystemClasses) { | |
| 157 SystemDictionary::always_strong_oops_do(roots); | |
| 158 } | |
| 159 } | |
| 160 | |
| 161 if (!_process_strong_tasks->is_task_claimed(SH_PS_SymbolTable_oops_do)) { | |
| 162 if (so & SO_Symbols) { | |
| 163 SymbolTable::oops_do(roots); | |
| 164 } | |
| 165 // Verify if the symbol table contents are in the perm gen | |
| 166 NOT_PRODUCT(SymbolTable::oops_do(&assert_is_perm_closure)); | |
| 167 } | |
| 168 | |
| 169 if (!_process_strong_tasks->is_task_claimed(SH_PS_StringTable_oops_do)) { | |
| 170 if (so & SO_Strings) { | |
| 171 StringTable::oops_do(roots); | |
| 172 } | |
| 173 // Verify if the string table contents are in the perm gen | |
| 174 NOT_PRODUCT(StringTable::oops_do(&assert_is_perm_closure)); | |
| 175 } | |
| 176 | |
| 177 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { | |
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178 if (so & SO_CodeCache) { |
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179 // (Currently, CMSCollector uses this to do intermediate-strength collections.) |
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180 assert(collecting_perm_gen, "scanning all of code cache"); |
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181 assert(code_roots != NULL, "must supply closure for code cache"); |
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182 if (code_roots != NULL) { |
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183 CodeCache::blobs_do(code_roots); |
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184 } |
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185 } else if (so & (SO_SystemClasses|SO_AllClasses)) { |
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186 if (!collecting_perm_gen) { |
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187 // If we are collecting from class statics, but we are not going to |
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188 // visit all of the CodeCache, collect from the non-perm roots if any. |
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189 // This makes the code cache function temporarily as a source of strong |
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190 // roots for oops, until the next major collection. |
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191 // |
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192 // If collecting_perm_gen is true, we require that this phase will call |
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193 // CodeCache::do_unloading. This will kill off nmethods with expired |
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194 // weak references, such as stale invokedynamic targets. |
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195 CodeCache::scavenge_root_nmethods_do(code_roots); |
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196 } |
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197 } |
| 0 | 198 // Verify if the code cache contents are in the perm gen |
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199 NOT_PRODUCT(CodeBlobToOopClosure assert_code_is_perm(&assert_is_perm_closure, /*do_marking=*/ false)); |
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200 NOT_PRODUCT(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_perm)); |
| 0 | 201 } |
| 202 | |
| 203 // Roots that should point only into permanent generation. | |
| 204 { | |
| 205 OopClosure* blk = NULL; | |
| 206 if (collecting_perm_gen) { | |
| 207 blk = roots; | |
| 208 } else { | |
| 209 debug_only(blk = &assert_is_perm_closure); | |
| 210 } | |
| 211 if (blk != NULL) { | |
| 212 if (!_process_strong_tasks->is_task_claimed(SH_PS_vmSymbols_oops_do)) | |
| 213 vmSymbols::oops_do(blk); | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 if (!collecting_perm_gen) { | |
| 218 // All threads perform this; coordination is handled internally. | |
| 219 | |
| 220 rem_set()->younger_refs_iterate(perm_gen(), perm_blk); | |
| 221 } | |
| 222 _process_strong_tasks->all_tasks_completed(); | |
| 223 } | |
| 224 | |
| 225 class AlwaysTrueClosure: public BoolObjectClosure { | |
| 226 public: | |
| 227 void do_object(oop p) { ShouldNotReachHere(); } | |
| 228 bool do_object_b(oop p) { return true; } | |
| 229 }; | |
| 230 static AlwaysTrueClosure always_true; | |
| 231 | |
| 232 class SkipAdjustingSharedStrings: public OopClosure { | |
| 233 OopClosure* _clo; | |
| 234 public: | |
| 235 SkipAdjustingSharedStrings(OopClosure* clo) : _clo(clo) {} | |
| 236 | |
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237 virtual void do_oop(oop* p) { |
| 0 | 238 oop o = (*p); |
| 239 if (!o->is_shared_readwrite()) { | |
| 240 _clo->do_oop(p); | |
| 241 } | |
| 242 } | |
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243 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
| 0 | 244 }; |
| 245 | |
| 246 // Unmarked shared Strings in the StringTable (which got there due to | |
| 247 // being in the constant pools of as-yet unloaded shared classes) were | |
| 248 // not marked and therefore did not have their mark words preserved. | |
| 249 // These entries are also deliberately not purged from the string | |
| 250 // table during unloading of unmarked strings. If an identity hash | |
| 251 // code was computed for any of these objects, it will not have been | |
| 252 // cleared to zero during the forwarding process or by the | |
| 253 // RecursiveAdjustSharedObjectClosure, and will be confused by the | |
| 254 // adjusting process as a forwarding pointer. We need to skip | |
| 255 // forwarding StringTable entries which contain unmarked shared | |
| 256 // Strings. Actually, since shared strings won't be moving, we can | |
| 257 // just skip adjusting any shared entries in the string table. | |
| 258 | |
| 259 void SharedHeap::process_weak_roots(OopClosure* root_closure, | |
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260 CodeBlobClosure* code_roots, |
| 0 | 261 OopClosure* non_root_closure) { |
| 262 // Global (weak) JNI handles | |
| 263 JNIHandles::weak_oops_do(&always_true, root_closure); | |
| 264 | |
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265 CodeCache::blobs_do(code_roots); |
| 0 | 266 SymbolTable::oops_do(root_closure); |
| 267 if (UseSharedSpaces && !DumpSharedSpaces) { | |
| 268 SkipAdjustingSharedStrings skip_closure(root_closure); | |
| 269 StringTable::oops_do(&skip_closure); | |
| 270 } else { | |
| 271 StringTable::oops_do(root_closure); | |
| 272 } | |
| 273 } | |
| 274 | |
| 275 void SharedHeap::set_barrier_set(BarrierSet* bs) { | |
| 276 _barrier_set = bs; | |
| 277 // Cached barrier set for fast access in oops | |
| 278 oopDesc::set_bs(bs); | |
| 279 } | |
| 280 | |
| 281 void SharedHeap::post_initialize() { | |
| 282 ref_processing_init(); | |
| 283 } | |
| 284 | |
| 285 void SharedHeap::ref_processing_init() { | |
| 286 perm_gen()->ref_processor_init(); | |
| 287 } | |
| 288 | |
| 289 // Some utilities. | |
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290 void SharedHeap::print_size_transition(outputStream* out, |
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291 size_t bytes_before, |
| 0 | 292 size_t bytes_after, |
| 293 size_t capacity) { | |
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294 out->print(" %d%s->%d%s(%d%s)", |
| 0 | 295 byte_size_in_proper_unit(bytes_before), |
| 296 proper_unit_for_byte_size(bytes_before), | |
| 297 byte_size_in_proper_unit(bytes_after), | |
| 298 proper_unit_for_byte_size(bytes_after), | |
| 299 byte_size_in_proper_unit(capacity), | |
| 300 proper_unit_for_byte_size(capacity)); | |
| 301 } |