Mercurial > hg > truffle
annotate src/share/vm/memory/sharedHeap.cpp @ 17983:57aecf00a0cd
Merge
author | neliasso |
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date | Fri, 13 Jun 2014 08:40:35 +0000 |
parents | 78bbf4d43a14 |
children | 52b4284cb496 9fec19bb0659 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 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/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "code/codeCache.hpp" | |
29 #include "gc_interface/collectedHeap.inline.hpp" | |
30 #include "memory/sharedHeap.hpp" | |
31 #include "oops/oop.inline.hpp" | |
32 #include "runtime/fprofiler.hpp" | |
33 #include "runtime/java.hpp" | |
34 #include "services/management.hpp" | |
35 #include "utilities/copy.hpp" | |
36 #include "utilities/workgroup.hpp" | |
0 | 37 |
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38 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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39 |
0 | 40 SharedHeap* SharedHeap::_sh; |
41 | |
42 // The set of potentially parallel tasks in strong root scanning. | |
43 enum SH_process_strong_roots_tasks { | |
44 SH_PS_Universe_oops_do, | |
45 SH_PS_JNIHandles_oops_do, | |
46 SH_PS_ObjectSynchronizer_oops_do, | |
47 SH_PS_FlatProfiler_oops_do, | |
48 SH_PS_Management_oops_do, | |
49 SH_PS_SystemDictionary_oops_do, | |
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50 SH_PS_ClassLoaderDataGraph_oops_do, |
0 | 51 SH_PS_jvmti_oops_do, |
52 SH_PS_CodeCache_oops_do, | |
53 // Leave this one last. | |
54 SH_PS_NumElements | |
55 }; | |
56 | |
57 SharedHeap::SharedHeap(CollectorPolicy* policy_) : | |
58 CollectedHeap(), | |
59 _collector_policy(policy_), | |
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60 _rem_set(NULL), |
0 | 61 _strong_roots_parity(0), |
62 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), | |
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63 _workers(NULL) |
0 | 64 { |
65 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
66 vm_exit_during_initialization("Failed necessary allocation."); | |
67 } | |
68 _sh = this; // ch is static, should be set only once. | |
69 if ((UseParNewGC || | |
11975 | 70 (UseConcMarkSweepGC && (CMSParallelInitialMarkEnabled || |
71 CMSParallelRemarkEnabled)) || | |
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72 UseG1GC) && |
0 | 73 ParallelGCThreads > 0) { |
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74 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, |
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75 /* are_GC_task_threads */true, |
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76 /* are_ConcurrentGC_threads */false); |
0 | 77 if (_workers == NULL) { |
78 vm_exit_during_initialization("Failed necessary allocation."); | |
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79 } else { |
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80 _workers->initialize_workers(); |
0 | 81 } |
82 } | |
83 } | |
84 | |
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85 int SharedHeap::n_termination() { |
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86 return _process_strong_tasks->n_threads(); |
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87 } |
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88 |
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89 void SharedHeap::set_n_termination(int t) { |
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90 _process_strong_tasks->set_n_threads(t); |
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91 } |
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92 |
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93 bool SharedHeap::heap_lock_held_for_gc() { |
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94 Thread* t = Thread::current(); |
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95 return Heap_lock->owned_by_self() |
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96 || ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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97 && _thread_holds_heap_lock_for_gc); |
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98 } |
0 | 99 |
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100 void SharedHeap::set_par_threads(uint t) { |
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101 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); |
0 | 102 _n_par_threads = t; |
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103 _process_strong_tasks->set_n_threads(t); |
0 | 104 } |
105 | |
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106 #ifdef ASSERT |
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107 class AssertNonScavengableClosure: public OopClosure { |
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108 public: |
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109 virtual void do_oop(oop* p) { |
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110 assert(!Universe::heap()->is_in_partial_collection(*p), |
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111 "Referent should not be scavengable."); } |
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112 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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113 }; |
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114 static AssertNonScavengableClosure assert_is_non_scavengable_closure; |
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115 #endif |
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116 |
0 | 117 void SharedHeap::change_strong_roots_parity() { |
118 // Also set the new collection parity. | |
119 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, | |
120 "Not in range."); | |
121 _strong_roots_parity++; | |
122 if (_strong_roots_parity == 3) _strong_roots_parity = 1; | |
123 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, | |
124 "Not in range."); | |
125 } | |
126 | |
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127 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate) |
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128 : MarkScope(activate) |
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129 { |
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130 if (_active) { |
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131 outer->change_strong_roots_parity(); |
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132 // Zero the claimed high water mark in the StringTable |
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133 StringTable::clear_parallel_claimed_index(); |
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134 } |
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135 } |
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136 |
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137 SharedHeap::StrongRootsScope::~StrongRootsScope() { |
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138 // nothing particular |
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139 } |
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140 |
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141 void SharedHeap::process_strong_roots(bool activate_scope, |
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142 bool is_scavenging, |
0 | 143 ScanningOption so, |
144 OopClosure* roots, | |
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145 CodeBlobClosure* code_roots, |
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146 KlassClosure* klass_closure) { |
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147 StrongRootsScope srs(this, activate_scope); |
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148 |
0 | 149 // General strong roots. |
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150 assert(_strong_roots_parity != 0, "must have called prologue code"); |
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151 // _n_termination for _process_strong_tasks should be set up stream |
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152 // in a method not running in a GC worker. Otherwise the GC worker |
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153 // could be trying to change the termination condition while the task |
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154 // is executing in another GC worker. |
0 | 155 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { |
156 Universe::oops_do(roots); | |
157 } | |
158 // Global (strong) JNI handles | |
159 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) | |
160 JNIHandles::oops_do(roots); | |
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161 |
0 | 162 // All threads execute this; the individual threads are task groups. |
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163 CLDToOopClosure roots_from_clds(roots); |
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164 CLDToOopClosure* roots_from_clds_p = (is_scavenging ? NULL : &roots_from_clds); |
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165 if (CollectedHeap::use_parallel_gc_threads()) { |
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166 Threads::possibly_parallel_oops_do(roots, roots_from_clds_p, code_roots); |
0 | 167 } else { |
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168 Threads::oops_do(roots, roots_from_clds_p, code_roots); |
0 | 169 } |
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170 |
0 | 171 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) |
172 ObjectSynchronizer::oops_do(roots); | |
173 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) | |
174 FlatProfiler::oops_do(roots); | |
175 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) | |
176 Management::oops_do(roots); | |
177 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) | |
178 JvmtiExport::oops_do(roots); | |
179 | |
180 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { | |
181 if (so & SO_AllClasses) { | |
182 SystemDictionary::oops_do(roots); | |
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183 } else if (so & SO_SystemClasses) { |
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184 SystemDictionary::always_strong_oops_do(roots); |
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185 } else { |
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186 fatal("We should always have selected either SO_AllClasses or SO_SystemClasses"); |
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187 } |
0 | 188 } |
189 | |
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190 if (!_process_strong_tasks->is_task_claimed(SH_PS_ClassLoaderDataGraph_oops_do)) { |
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191 if (so & SO_AllClasses) { |
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192 ClassLoaderDataGraph::oops_do(roots, klass_closure, !is_scavenging); |
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193 } else if (so & SO_SystemClasses) { |
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194 ClassLoaderDataGraph::always_strong_oops_do(roots, klass_closure, !is_scavenging); |
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195 } |
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196 } |
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197 |
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198 // All threads execute the following. A specific chunk of buckets |
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199 // from the StringTable are the individual tasks. |
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200 if (so & SO_Strings) { |
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201 if (CollectedHeap::use_parallel_gc_threads()) { |
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202 StringTable::possibly_parallel_oops_do(roots); |
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203 } else { |
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204 StringTable::oops_do(roots); |
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205 } |
0 | 206 } |
207 | |
208 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { | |
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209 if (so & SO_CodeCache) { |
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210 assert(code_roots != NULL, "must supply closure for code cache"); |
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211 |
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212 if (is_scavenging) { |
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213 // We only visit parts of the CodeCache when scavenging. |
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214 CodeCache::scavenge_root_nmethods_do(code_roots); |
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215 } else { |
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216 // CMSCollector uses this to do intermediate-strength collections. |
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217 // We scan the entire code cache, since CodeCache::do_unloading is not called. |
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218 CodeCache::blobs_do(code_roots); |
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219 } |
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220 } |
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221 // Verify that the code cache contents are not subject to |
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222 // movement by a scavenging collection. |
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223 DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, /*do_marking=*/ false)); |
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224 DEBUG_ONLY(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable)); |
0 | 225 } |
226 | |
227 _process_strong_tasks->all_tasks_completed(); | |
228 } | |
229 | |
230 class AlwaysTrueClosure: public BoolObjectClosure { | |
231 public: | |
232 bool do_object_b(oop p) { return true; } | |
233 }; | |
234 static AlwaysTrueClosure always_true; | |
235 | |
236 void SharedHeap::process_weak_roots(OopClosure* root_closure, | |
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237 CodeBlobClosure* code_roots) { |
0 | 238 // Global (weak) JNI handles |
239 JNIHandles::weak_oops_do(&always_true, root_closure); | |
240 | |
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241 CodeCache::blobs_do(code_roots); |
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242 StringTable::oops_do(root_closure); |
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243 } |
0 | 244 |
245 void SharedHeap::set_barrier_set(BarrierSet* bs) { | |
246 _barrier_set = bs; | |
247 // Cached barrier set for fast access in oops | |
248 oopDesc::set_bs(bs); | |
249 } | |
250 | |
251 void SharedHeap::post_initialize() { | |
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252 CollectedHeap::post_initialize(); |
0 | 253 ref_processing_init(); |
254 } | |
255 | |
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256 void SharedHeap::ref_processing_init() {} |
0 | 257 |
258 // Some utilities. | |
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259 void SharedHeap::print_size_transition(outputStream* out, |
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260 size_t bytes_before, |
0 | 261 size_t bytes_after, |
262 size_t capacity) { | |
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263 out->print(" %d%s->%d%s(%d%s)", |
0 | 264 byte_size_in_proper_unit(bytes_before), |
265 proper_unit_for_byte_size(bytes_before), | |
266 byte_size_in_proper_unit(bytes_after), | |
267 proper_unit_for_byte_size(bytes_after), | |
268 byte_size_in_proper_unit(capacity), | |
269 proper_unit_for_byte_size(capacity)); | |
270 } |