Mercurial > hg > graal-compiler
annotate src/share/vm/memory/sharedHeap.cpp @ 6231:7e5976e66c62
7182543: NMT ON: Aggregate a few NMT related bugs
Summary: 1) Fixed MemTrackWorker::generations_in_used() calculation 2) Ensured NMT not to leak memory recorders after shutdown 3) Used ThreadCritical to block safepoint safe threads
Reviewed-by: acorn, coleenp, dholmes, kvn
author | zgu |
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date | Thu, 19 Jul 2012 09:05:42 -0400 |
parents | 441e946dc1af |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2011, 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 |
38 SharedHeap* SharedHeap::_sh; | |
39 | |
40 // The set of potentially parallel tasks in strong root scanning. | |
41 enum SH_process_strong_roots_tasks { | |
42 SH_PS_Universe_oops_do, | |
43 SH_PS_JNIHandles_oops_do, | |
44 SH_PS_ObjectSynchronizer_oops_do, | |
45 SH_PS_FlatProfiler_oops_do, | |
46 SH_PS_Management_oops_do, | |
47 SH_PS_SystemDictionary_oops_do, | |
48 SH_PS_jvmti_oops_do, | |
49 SH_PS_StringTable_oops_do, | |
50 SH_PS_CodeCache_oops_do, | |
51 // Leave this one last. | |
52 SH_PS_NumElements | |
53 }; | |
54 | |
55 SharedHeap::SharedHeap(CollectorPolicy* policy_) : | |
56 CollectedHeap(), | |
57 _collector_policy(policy_), | |
58 _perm_gen(NULL), _rem_set(NULL), | |
59 _strong_roots_parity(0), | |
60 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), | |
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61 _workers(NULL) |
0 | 62 { |
63 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
64 vm_exit_during_initialization("Failed necessary allocation."); | |
65 } | |
66 _sh = this; // ch is static, should be set only once. | |
67 if ((UseParNewGC || | |
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68 (UseConcMarkSweepGC && CMSParallelRemarkEnabled) || |
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69 UseG1GC) && |
0 | 70 ParallelGCThreads > 0) { |
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71 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, |
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72 /* are_GC_task_threads */true, |
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73 /* are_ConcurrentGC_threads */false); |
0 | 74 if (_workers == NULL) { |
75 vm_exit_during_initialization("Failed necessary allocation."); | |
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76 } else { |
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77 _workers->initialize_workers(); |
0 | 78 } |
79 } | |
80 } | |
81 | |
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82 int SharedHeap::n_termination() { |
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83 return _process_strong_tasks->n_threads(); |
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84 } |
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85 |
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86 void SharedHeap::set_n_termination(int t) { |
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87 _process_strong_tasks->set_n_threads(t); |
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88 } |
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89 |
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90 bool SharedHeap::heap_lock_held_for_gc() { |
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91 Thread* t = Thread::current(); |
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92 return Heap_lock->owned_by_self() |
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93 || ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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94 && _thread_holds_heap_lock_for_gc); |
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95 } |
0 | 96 |
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97 void SharedHeap::set_par_threads(uint t) { |
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98 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); |
0 | 99 _n_par_threads = t; |
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100 _process_strong_tasks->set_n_threads(t); |
0 | 101 } |
102 | |
103 class AssertIsPermClosure: public OopClosure { | |
104 public: | |
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105 virtual void do_oop(oop* p) { |
0 | 106 assert((*p) == NULL || (*p)->is_perm(), "Referent should be perm."); |
107 } | |
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108 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 109 }; |
110 static AssertIsPermClosure assert_is_perm_closure; | |
111 | |
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112 #ifdef ASSERT |
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113 class AssertNonScavengableClosure: public OopClosure { |
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114 public: |
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115 virtual void do_oop(oop* p) { |
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116 assert(!Universe::heap()->is_in_partial_collection(*p), |
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117 "Referent should not be scavengable."); } |
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118 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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119 }; |
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120 static AssertNonScavengableClosure assert_is_non_scavengable_closure; |
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121 #endif |
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122 |
0 | 123 void SharedHeap::change_strong_roots_parity() { |
124 // Also set the new collection parity. | |
125 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, | |
126 "Not in range."); | |
127 _strong_roots_parity++; | |
128 if (_strong_roots_parity == 3) _strong_roots_parity = 1; | |
129 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, | |
130 "Not in range."); | |
131 } | |
132 | |
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133 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate) |
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134 : MarkScope(activate) |
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135 { |
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136 if (_active) { |
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137 outer->change_strong_roots_parity(); |
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138 } |
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139 } |
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140 |
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141 SharedHeap::StrongRootsScope::~StrongRootsScope() { |
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142 // nothing particular |
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143 } |
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144 |
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145 void SharedHeap::process_strong_roots(bool activate_scope, |
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146 bool collecting_perm_gen, |
0 | 147 ScanningOption so, |
148 OopClosure* roots, | |
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149 CodeBlobClosure* code_roots, |
0 | 150 OopsInGenClosure* perm_blk) { |
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151 StrongRootsScope srs(this, activate_scope); |
0 | 152 // General strong roots. |
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153 assert(_strong_roots_parity != 0, "must have called prologue code"); |
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154 // _n_termination for _process_strong_tasks should be set up stream |
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155 // in a method not running in a GC worker. Otherwise the GC worker |
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156 // could be trying to change the termination condition while the task |
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157 // is executing in another GC worker. |
0 | 158 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { |
159 Universe::oops_do(roots); | |
160 // Consider perm-gen discovered lists to be strong. | |
161 perm_gen()->ref_processor()->weak_oops_do(roots); | |
162 } | |
163 // Global (strong) JNI handles | |
164 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) | |
165 JNIHandles::oops_do(roots); | |
166 // All threads execute this; the individual threads are task groups. | |
167 if (ParallelGCThreads > 0) { | |
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168 Threads::possibly_parallel_oops_do(roots, code_roots); |
0 | 169 } else { |
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170 Threads::oops_do(roots, code_roots); |
0 | 171 } |
172 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) | |
173 ObjectSynchronizer::oops_do(roots); | |
174 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) | |
175 FlatProfiler::oops_do(roots); | |
176 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) | |
177 Management::oops_do(roots); | |
178 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) | |
179 JvmtiExport::oops_do(roots); | |
180 | |
181 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { | |
182 if (so & SO_AllClasses) { | |
183 SystemDictionary::oops_do(roots); | |
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184 } else if (so & SO_SystemClasses) { |
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185 SystemDictionary::always_strong_oops_do(roots); |
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186 } |
0 | 187 } |
188 | |
189 if (!_process_strong_tasks->is_task_claimed(SH_PS_StringTable_oops_do)) { | |
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190 if (so & SO_Strings || (!collecting_perm_gen && !JavaObjectsInPerm)) { |
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191 StringTable::oops_do(roots); |
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192 } |
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193 if (JavaObjectsInPerm) { |
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194 // Verify the string table contents are in the perm gen |
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195 NOT_PRODUCT(StringTable::oops_do(&assert_is_perm_closure)); |
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196 } |
0 | 197 } |
198 | |
199 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { | |
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200 if (so & SO_CodeCache) { |
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201 // (Currently, CMSCollector uses this to do intermediate-strength collections.) |
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202 assert(collecting_perm_gen, "scanning all of code cache"); |
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203 assert(code_roots != NULL, "must supply closure for code cache"); |
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204 if (code_roots != NULL) { |
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205 CodeCache::blobs_do(code_roots); |
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206 } |
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207 } else if (so & (SO_SystemClasses|SO_AllClasses)) { |
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208 if (!collecting_perm_gen) { |
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209 // If we are collecting from class statics, but we are not going to |
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210 // visit all of the CodeCache, collect from the non-perm roots if any. |
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211 // This makes the code cache function temporarily as a source of strong |
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212 // roots for oops, until the next major collection. |
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213 // |
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214 // If collecting_perm_gen is true, we require that this phase will call |
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215 // CodeCache::do_unloading. This will kill off nmethods with expired |
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216 // weak references, such as stale invokedynamic targets. |
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217 CodeCache::scavenge_root_nmethods_do(code_roots); |
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218 } |
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219 } |
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220 // Verify that the code cache contents are not subject to |
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221 // movement by a scavenging collection. |
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222 DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, /*do_marking=*/ false)); |
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223 DEBUG_ONLY(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable)); |
0 | 224 } |
225 | |
226 if (!collecting_perm_gen) { | |
227 // All threads perform this; coordination is handled internally. | |
228 | |
229 rem_set()->younger_refs_iterate(perm_gen(), perm_blk); | |
230 } | |
231 _process_strong_tasks->all_tasks_completed(); | |
232 } | |
233 | |
234 class AlwaysTrueClosure: public BoolObjectClosure { | |
235 public: | |
236 void do_object(oop p) { ShouldNotReachHere(); } | |
237 bool do_object_b(oop p) { return true; } | |
238 }; | |
239 static AlwaysTrueClosure always_true; | |
240 | |
241 class SkipAdjustingSharedStrings: public OopClosure { | |
242 OopClosure* _clo; | |
243 public: | |
244 SkipAdjustingSharedStrings(OopClosure* clo) : _clo(clo) {} | |
245 | |
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246 virtual void do_oop(oop* p) { |
0 | 247 oop o = (*p); |
248 if (!o->is_shared_readwrite()) { | |
249 _clo->do_oop(p); | |
250 } | |
251 } | |
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252 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 253 }; |
254 | |
255 // Unmarked shared Strings in the StringTable (which got there due to | |
256 // being in the constant pools of as-yet unloaded shared classes) were | |
257 // not marked and therefore did not have their mark words preserved. | |
258 // These entries are also deliberately not purged from the string | |
259 // table during unloading of unmarked strings. If an identity hash | |
260 // code was computed for any of these objects, it will not have been | |
261 // cleared to zero during the forwarding process or by the | |
262 // RecursiveAdjustSharedObjectClosure, and will be confused by the | |
263 // adjusting process as a forwarding pointer. We need to skip | |
264 // forwarding StringTable entries which contain unmarked shared | |
265 // Strings. Actually, since shared strings won't be moving, we can | |
266 // just skip adjusting any shared entries in the string table. | |
267 | |
268 void SharedHeap::process_weak_roots(OopClosure* root_closure, | |
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269 CodeBlobClosure* code_roots, |
0 | 270 OopClosure* non_root_closure) { |
271 // Global (weak) JNI handles | |
272 JNIHandles::weak_oops_do(&always_true, root_closure); | |
273 | |
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274 CodeCache::blobs_do(code_roots); |
0 | 275 if (UseSharedSpaces && !DumpSharedSpaces) { |
276 SkipAdjustingSharedStrings skip_closure(root_closure); | |
277 StringTable::oops_do(&skip_closure); | |
278 } else { | |
279 StringTable::oops_do(root_closure); | |
280 } | |
281 } | |
282 | |
283 void SharedHeap::set_barrier_set(BarrierSet* bs) { | |
284 _barrier_set = bs; | |
285 // Cached barrier set for fast access in oops | |
286 oopDesc::set_bs(bs); | |
287 } | |
288 | |
289 void SharedHeap::post_initialize() { | |
290 ref_processing_init(); | |
291 } | |
292 | |
293 void SharedHeap::ref_processing_init() { | |
294 perm_gen()->ref_processor_init(); | |
295 } | |
296 | |
297 // Some utilities. | |
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298 void SharedHeap::print_size_transition(outputStream* out, |
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299 size_t bytes_before, |
0 | 300 size_t bytes_after, |
301 size_t capacity) { | |
342
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302 out->print(" %d%s->%d%s(%d%s)", |
0 | 303 byte_size_in_proper_unit(bytes_before), |
304 proper_unit_for_byte_size(bytes_before), | |
305 byte_size_in_proper_unit(bytes_after), | |
306 proper_unit_for_byte_size(bytes_after), | |
307 byte_size_in_proper_unit(capacity), | |
308 proper_unit_for_byte_size(capacity)); | |
309 } |