Mercurial > hg > truffle
annotate src/share/vm/memory/sharedHeap.cpp @ 671:d0994e5bebce
6822204: volatile fences should prefer lock:addl to actual mfence instructions
Reviewed-by: kvn, phh
author | never |
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date | Thu, 26 Mar 2009 14:31:45 -0700 |
parents | 0fbdb4381b99 |
children | 148e5441d916 |
rev | line source |
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0 | 1 /* |
579 | 2 * Copyright 2000-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
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)), | |
53 _workers(NULL), _n_par_threads(0) | |
54 { | |
55 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
56 vm_exit_during_initialization("Failed necessary allocation."); | |
57 } | |
58 _sh = this; // ch is static, should be set only once. | |
59 if ((UseParNewGC || | |
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60 (UseConcMarkSweepGC && CMSParallelRemarkEnabled) || |
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61 UseG1GC) && |
0 | 62 ParallelGCThreads > 0) { |
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63 _workers = new WorkGang("Parallel GC Threads", ParallelGCThreads, |
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64 /* are_GC_task_threads */true, |
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65 /* are_ConcurrentGC_threads */false); |
0 | 66 if (_workers == NULL) { |
67 vm_exit_during_initialization("Failed necessary allocation."); | |
68 } | |
69 } | |
70 } | |
71 | |
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72 bool SharedHeap::heap_lock_held_for_gc() { |
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73 Thread* t = Thread::current(); |
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74 return Heap_lock->owned_by_self() |
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75 || ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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76 && _thread_holds_heap_lock_for_gc); |
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77 } |
0 | 78 |
79 void SharedHeap::set_par_threads(int t) { | |
80 _n_par_threads = t; | |
81 _process_strong_tasks->set_par_threads(t); | |
82 } | |
83 | |
84 class AssertIsPermClosure: public OopClosure { | |
85 public: | |
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86 virtual void do_oop(oop* p) { |
0 | 87 assert((*p) == NULL || (*p)->is_perm(), "Referent should be perm."); |
88 } | |
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89 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 90 }; |
91 static AssertIsPermClosure assert_is_perm_closure; | |
92 | |
93 void SharedHeap::change_strong_roots_parity() { | |
94 // Also set the new collection parity. | |
95 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, | |
96 "Not in range."); | |
97 _strong_roots_parity++; | |
98 if (_strong_roots_parity == 3) _strong_roots_parity = 1; | |
99 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, | |
100 "Not in range."); | |
101 } | |
102 | |
103 void SharedHeap::process_strong_roots(bool collecting_perm_gen, | |
104 ScanningOption so, | |
105 OopClosure* roots, | |
106 OopsInGenClosure* perm_blk) { | |
107 // General strong roots. | |
108 if (n_par_threads() == 0) change_strong_roots_parity(); | |
109 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { | |
110 Universe::oops_do(roots); | |
111 ReferenceProcessor::oops_do(roots); | |
112 // Consider perm-gen discovered lists to be strong. | |
113 perm_gen()->ref_processor()->weak_oops_do(roots); | |
114 } | |
115 // Global (strong) JNI handles | |
116 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) | |
117 JNIHandles::oops_do(roots); | |
118 // All threads execute this; the individual threads are task groups. | |
119 if (ParallelGCThreads > 0) { | |
120 Threads::possibly_parallel_oops_do(roots); | |
121 } else { | |
122 Threads::oops_do(roots); | |
123 } | |
124 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) | |
125 ObjectSynchronizer::oops_do(roots); | |
126 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) | |
127 FlatProfiler::oops_do(roots); | |
128 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) | |
129 Management::oops_do(roots); | |
130 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) | |
131 JvmtiExport::oops_do(roots); | |
132 | |
133 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { | |
134 if (so & SO_AllClasses) { | |
135 SystemDictionary::oops_do(roots); | |
136 } else | |
137 if (so & SO_SystemClasses) { | |
138 SystemDictionary::always_strong_oops_do(roots); | |
139 } | |
140 } | |
141 | |
142 if (!_process_strong_tasks->is_task_claimed(SH_PS_SymbolTable_oops_do)) { | |
143 if (so & SO_Symbols) { | |
144 SymbolTable::oops_do(roots); | |
145 } | |
146 // Verify if the symbol table contents are in the perm gen | |
147 NOT_PRODUCT(SymbolTable::oops_do(&assert_is_perm_closure)); | |
148 } | |
149 | |
150 if (!_process_strong_tasks->is_task_claimed(SH_PS_StringTable_oops_do)) { | |
151 if (so & SO_Strings) { | |
152 StringTable::oops_do(roots); | |
153 } | |
154 // Verify if the string table contents are in the perm gen | |
155 NOT_PRODUCT(StringTable::oops_do(&assert_is_perm_closure)); | |
156 } | |
157 | |
158 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { | |
159 if (so & SO_CodeCache) { | |
160 CodeCache::oops_do(roots); | |
161 } | |
162 // Verify if the code cache contents are in the perm gen | |
163 NOT_PRODUCT(CodeCache::oops_do(&assert_is_perm_closure)); | |
164 } | |
165 | |
166 // Roots that should point only into permanent generation. | |
167 { | |
168 OopClosure* blk = NULL; | |
169 if (collecting_perm_gen) { | |
170 blk = roots; | |
171 } else { | |
172 debug_only(blk = &assert_is_perm_closure); | |
173 } | |
174 if (blk != NULL) { | |
175 if (!_process_strong_tasks->is_task_claimed(SH_PS_vmSymbols_oops_do)) | |
176 vmSymbols::oops_do(blk); | |
177 } | |
178 } | |
179 | |
180 if (!collecting_perm_gen) { | |
181 // All threads perform this; coordination is handled internally. | |
182 | |
183 rem_set()->younger_refs_iterate(perm_gen(), perm_blk); | |
184 } | |
185 _process_strong_tasks->all_tasks_completed(); | |
186 } | |
187 | |
188 class AlwaysTrueClosure: public BoolObjectClosure { | |
189 public: | |
190 void do_object(oop p) { ShouldNotReachHere(); } | |
191 bool do_object_b(oop p) { return true; } | |
192 }; | |
193 static AlwaysTrueClosure always_true; | |
194 | |
195 class SkipAdjustingSharedStrings: public OopClosure { | |
196 OopClosure* _clo; | |
197 public: | |
198 SkipAdjustingSharedStrings(OopClosure* clo) : _clo(clo) {} | |
199 | |
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200 virtual void do_oop(oop* p) { |
0 | 201 oop o = (*p); |
202 if (!o->is_shared_readwrite()) { | |
203 _clo->do_oop(p); | |
204 } | |
205 } | |
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206 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 207 }; |
208 | |
209 // Unmarked shared Strings in the StringTable (which got there due to | |
210 // being in the constant pools of as-yet unloaded shared classes) were | |
211 // not marked and therefore did not have their mark words preserved. | |
212 // These entries are also deliberately not purged from the string | |
213 // table during unloading of unmarked strings. If an identity hash | |
214 // code was computed for any of these objects, it will not have been | |
215 // cleared to zero during the forwarding process or by the | |
216 // RecursiveAdjustSharedObjectClosure, and will be confused by the | |
217 // adjusting process as a forwarding pointer. We need to skip | |
218 // forwarding StringTable entries which contain unmarked shared | |
219 // Strings. Actually, since shared strings won't be moving, we can | |
220 // just skip adjusting any shared entries in the string table. | |
221 | |
222 void SharedHeap::process_weak_roots(OopClosure* root_closure, | |
223 OopClosure* non_root_closure) { | |
224 // Global (weak) JNI handles | |
225 JNIHandles::weak_oops_do(&always_true, root_closure); | |
226 | |
227 CodeCache::oops_do(non_root_closure); | |
228 SymbolTable::oops_do(root_closure); | |
229 if (UseSharedSpaces && !DumpSharedSpaces) { | |
230 SkipAdjustingSharedStrings skip_closure(root_closure); | |
231 StringTable::oops_do(&skip_closure); | |
232 } else { | |
233 StringTable::oops_do(root_closure); | |
234 } | |
235 } | |
236 | |
237 void SharedHeap::set_barrier_set(BarrierSet* bs) { | |
238 _barrier_set = bs; | |
239 // Cached barrier set for fast access in oops | |
240 oopDesc::set_bs(bs); | |
241 } | |
242 | |
243 void SharedHeap::post_initialize() { | |
244 ref_processing_init(); | |
245 } | |
246 | |
247 void SharedHeap::ref_processing_init() { | |
248 perm_gen()->ref_processor_init(); | |
249 } | |
250 | |
251 // Some utilities. | |
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252 void SharedHeap::print_size_transition(outputStream* out, |
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253 size_t bytes_before, |
0 | 254 size_t bytes_after, |
255 size_t capacity) { | |
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256 out->print(" %d%s->%d%s(%d%s)", |
0 | 257 byte_size_in_proper_unit(bytes_before), |
258 proper_unit_for_byte_size(bytes_before), | |
259 byte_size_in_proper_unit(bytes_after), | |
260 proper_unit_for_byte_size(bytes_after), | |
261 byte_size_in_proper_unit(capacity), | |
262 proper_unit_for_byte_size(capacity)); | |
263 } |