Mercurial > hg > truffle
annotate src/share/vm/memory/sharedHeap.cpp @ 20340:fbc31318922c hs25.40-b06
Merge
author | amurillo |
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date | Thu, 21 Aug 2014 14:42:54 -0700 |
parents | f3aeae1f9fc5 |
children | 7848fc12602b |
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" | |
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32 #include "runtime/atomic.inline.hpp" |
1972 | 33 #include "runtime/fprofiler.hpp" |
34 #include "runtime/java.hpp" | |
35 #include "services/management.hpp" | |
36 #include "utilities/copy.hpp" | |
37 #include "utilities/workgroup.hpp" | |
0 | 38 |
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39 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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40 |
0 | 41 SharedHeap* SharedHeap::_sh; |
42 | |
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43 // The set of potentially parallel tasks in root scanning. |
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44 enum SH_process_roots_tasks { |
0 | 45 SH_PS_Universe_oops_do, |
46 SH_PS_JNIHandles_oops_do, | |
47 SH_PS_ObjectSynchronizer_oops_do, | |
48 SH_PS_FlatProfiler_oops_do, | |
49 SH_PS_Management_oops_do, | |
50 SH_PS_SystemDictionary_oops_do, | |
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51 SH_PS_ClassLoaderDataGraph_oops_do, |
0 | 52 SH_PS_jvmti_oops_do, |
53 SH_PS_CodeCache_oops_do, | |
54 // Leave this one last. | |
55 SH_PS_NumElements | |
56 }; | |
57 | |
58 SharedHeap::SharedHeap(CollectorPolicy* policy_) : | |
59 CollectedHeap(), | |
60 _collector_policy(policy_), | |
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61 _rem_set(NULL), |
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62 _strong_roots_scope(NULL), |
0 | 63 _strong_roots_parity(0), |
64 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), | |
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65 _workers(NULL) |
0 | 66 { |
67 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
68 vm_exit_during_initialization("Failed necessary allocation."); | |
69 } | |
70 _sh = this; // ch is static, should be set only once. | |
71 if ((UseParNewGC || | |
11975 | 72 (UseConcMarkSweepGC && (CMSParallelInitialMarkEnabled || |
73 CMSParallelRemarkEnabled)) || | |
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74 UseG1GC) && |
0 | 75 ParallelGCThreads > 0) { |
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76 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, |
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77 /* are_GC_task_threads */true, |
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78 /* are_ConcurrentGC_threads */false); |
0 | 79 if (_workers == NULL) { |
80 vm_exit_during_initialization("Failed necessary allocation."); | |
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81 } else { |
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82 _workers->initialize_workers(); |
0 | 83 } |
84 } | |
85 } | |
86 | |
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87 int SharedHeap::n_termination() { |
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88 return _process_strong_tasks->n_threads(); |
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89 } |
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90 |
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91 void SharedHeap::set_n_termination(int t) { |
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92 _process_strong_tasks->set_n_threads(t); |
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93 } |
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94 |
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95 bool SharedHeap::heap_lock_held_for_gc() { |
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96 Thread* t = Thread::current(); |
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97 return Heap_lock->owned_by_self() |
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98 || ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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99 && _thread_holds_heap_lock_for_gc); |
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100 } |
0 | 101 |
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102 void SharedHeap::set_par_threads(uint t) { |
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103 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); |
0 | 104 _n_par_threads = t; |
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105 _process_strong_tasks->set_n_threads(t); |
0 | 106 } |
107 | |
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108 #ifdef ASSERT |
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109 class AssertNonScavengableClosure: public OopClosure { |
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110 public: |
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111 virtual void do_oop(oop* p) { |
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112 assert(!Universe::heap()->is_in_partial_collection(*p), |
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113 "Referent should not be scavengable."); } |
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114 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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115 }; |
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116 static AssertNonScavengableClosure assert_is_non_scavengable_closure; |
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117 #endif |
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118 |
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119 SharedHeap::StrongRootsScope* SharedHeap::active_strong_roots_scope() const { |
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120 return _strong_roots_scope; |
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121 } |
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122 void SharedHeap::register_strong_roots_scope(SharedHeap::StrongRootsScope* scope) { |
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123 assert(_strong_roots_scope == NULL, "Should only have one StrongRootsScope active"); |
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124 assert(scope != NULL, "Illegal argument"); |
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125 _strong_roots_scope = scope; |
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126 } |
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127 void SharedHeap::unregister_strong_roots_scope(SharedHeap::StrongRootsScope* scope) { |
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128 assert(_strong_roots_scope == scope, "Wrong scope unregistered"); |
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129 _strong_roots_scope = NULL; |
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130 } |
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131 |
0 | 132 void SharedHeap::change_strong_roots_parity() { |
133 // Also set the new collection parity. | |
134 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, | |
135 "Not in range."); | |
136 _strong_roots_parity++; | |
137 if (_strong_roots_parity == 3) _strong_roots_parity = 1; | |
138 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, | |
139 "Not in range."); | |
140 } | |
141 | |
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142 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* heap, bool activate) |
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143 : MarkScope(activate), _sh(heap), _n_workers_done_with_threads(0) |
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144 { |
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145 if (_active) { |
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146 _sh->register_strong_roots_scope(this); |
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147 _sh->change_strong_roots_parity(); |
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148 // Zero the claimed high water mark in the StringTable |
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149 StringTable::clear_parallel_claimed_index(); |
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150 } |
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151 } |
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152 |
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153 SharedHeap::StrongRootsScope::~StrongRootsScope() { |
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154 if (_active) { |
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155 _sh->unregister_strong_roots_scope(this); |
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156 } |
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157 } |
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158 |
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159 Monitor* SharedHeap::StrongRootsScope::_lock = new Monitor(Mutex::leaf, "StrongRootsScope lock", false); |
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160 |
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161 void SharedHeap::StrongRootsScope::mark_worker_done_with_threads(uint n_workers) { |
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162 // The Thread work barrier is only needed by G1 Class Unloading. |
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163 // No need to use the barrier if this is single-threaded code. |
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164 if (UseG1GC && ClassUnloadingWithConcurrentMark && n_workers > 0) { |
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165 uint new_value = (uint)Atomic::add(1, &_n_workers_done_with_threads); |
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166 if (new_value == n_workers) { |
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167 // This thread is last. Notify the others. |
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168 MonitorLockerEx ml(_lock, Mutex::_no_safepoint_check_flag); |
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169 _lock->notify_all(); |
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170 } |
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171 } |
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172 } |
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173 |
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174 void SharedHeap::StrongRootsScope::wait_until_all_workers_done_with_threads(uint n_workers) { |
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175 assert(UseG1GC, "Currently only used by G1"); |
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176 assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading"); |
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177 |
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178 // No need to use the barrier if this is single-threaded code. |
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179 if (n_workers > 0 && (uint)_n_workers_done_with_threads != n_workers) { |
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180 MonitorLockerEx ml(_lock, Mutex::_no_safepoint_check_flag); |
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181 while ((uint)_n_workers_done_with_threads != n_workers) { |
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182 _lock->wait(Mutex::_no_safepoint_check_flag, 0, false); |
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183 } |
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184 } |
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185 } |
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186 |
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187 void SharedHeap::process_roots(bool activate_scope, |
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188 ScanningOption so, |
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189 OopClosure* strong_roots, |
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190 OopClosure* weak_roots, |
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191 CLDClosure* strong_cld_closure, |
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192 CLDClosure* weak_cld_closure, |
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193 CodeBlobClosure* code_roots) { |
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194 StrongRootsScope srs(this, activate_scope); |
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195 |
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196 // General roots. |
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197 assert(_strong_roots_parity != 0, "must have called prologue code"); |
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198 assert(code_roots != NULL, "code root closure should always be set"); |
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199 // _n_termination for _process_strong_tasks should be set up stream |
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200 // in a method not running in a GC worker. Otherwise the GC worker |
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201 // could be trying to change the termination condition while the task |
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202 // is executing in another GC worker. |
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203 |
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204 // Iterating over the CLDG and the Threads are done early to allow G1 to |
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205 // first process the strong CLDs and nmethods and then, after a barrier, |
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206 // let the thread process the weak CLDs and nmethods. |
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207 |
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208 if (!_process_strong_tasks->is_task_claimed(SH_PS_ClassLoaderDataGraph_oops_do)) { |
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209 ClassLoaderDataGraph::roots_cld_do(strong_cld_closure, weak_cld_closure); |
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210 } |
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211 |
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212 // Some CLDs contained in the thread frames should be considered strong. |
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213 // Don't process them if they will be processed during the ClassLoaderDataGraph phase. |
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214 CLDClosure* roots_from_clds_p = (strong_cld_closure != weak_cld_closure) ? strong_cld_closure : NULL; |
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215 // Only process code roots from thread stacks if we aren't visiting the entire CodeCache anyway |
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216 CodeBlobClosure* roots_from_code_p = (so & SO_AllCodeCache) ? NULL : code_roots; |
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217 |
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218 Threads::possibly_parallel_oops_do(strong_roots, roots_from_clds_p, roots_from_code_p); |
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219 |
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220 // This is the point where this worker thread will not find more strong CLDs/nmethods. |
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221 // Report this so G1 can synchronize the strong and weak CLDs/nmethods processing. |
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222 active_strong_roots_scope()->mark_worker_done_with_threads(n_par_threads()); |
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223 |
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224 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { |
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225 Universe::oops_do(strong_roots); |
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226 } |
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227 // Global (strong) JNI handles |
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228 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) |
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229 JNIHandles::oops_do(strong_roots); |
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230 |
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231 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) |
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232 ObjectSynchronizer::oops_do(strong_roots); |
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233 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) |
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234 FlatProfiler::oops_do(strong_roots); |
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235 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) |
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236 Management::oops_do(strong_roots); |
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237 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) |
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238 JvmtiExport::oops_do(strong_roots); |
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239 |
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240 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { |
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241 SystemDictionary::roots_oops_do(strong_roots, weak_roots); |
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242 } |
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243 |
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244 // All threads execute the following. A specific chunk of buckets |
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245 // from the StringTable are the individual tasks. |
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246 if (weak_roots != NULL) { |
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247 if (CollectedHeap::use_parallel_gc_threads()) { |
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248 StringTable::possibly_parallel_oops_do(weak_roots); |
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249 } else { |
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250 StringTable::oops_do(weak_roots); |
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251 } |
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252 } |
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253 |
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254 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { |
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255 if (so & SO_ScavengeCodeCache) { |
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256 assert(code_roots != NULL, "must supply closure for code cache"); |
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257 |
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258 // We only visit parts of the CodeCache when scavenging. |
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259 CodeCache::scavenge_root_nmethods_do(code_roots); |
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260 } |
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261 if (so & SO_AllCodeCache) { |
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262 assert(code_roots != NULL, "must supply closure for code cache"); |
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263 |
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264 // CMSCollector uses this to do intermediate-strength collections. |
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265 // We scan the entire code cache, since CodeCache::do_unloading is not called. |
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266 CodeCache::blobs_do(code_roots); |
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267 } |
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268 // Verify that the code cache contents are not subject to |
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269 // movement by a scavenging collection. |
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270 DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, !CodeBlobToOopClosure::FixRelocations)); |
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271 DEBUG_ONLY(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable)); |
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272 } |
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273 |
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274 _process_strong_tasks->all_tasks_completed(); |
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275 } |
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276 |
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277 void SharedHeap::process_all_roots(bool activate_scope, |
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278 ScanningOption so, |
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279 OopClosure* roots, |
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280 CLDClosure* cld_closure, |
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281 CodeBlobClosure* code_closure) { |
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282 process_roots(activate_scope, so, |
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283 roots, roots, |
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284 cld_closure, cld_closure, |
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285 code_closure); |
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286 } |
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287 |
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288 void SharedHeap::process_strong_roots(bool activate_scope, |
0 | 289 ScanningOption so, |
290 OopClosure* roots, | |
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291 CLDClosure* cld_closure, |
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292 CodeBlobClosure* code_closure) { |
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293 process_roots(activate_scope, so, |
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294 roots, NULL, |
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295 cld_closure, NULL, |
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296 code_closure); |
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297 } |
0 | 298 |
299 | |
300 class AlwaysTrueClosure: public BoolObjectClosure { | |
301 public: | |
302 bool do_object_b(oop p) { return true; } | |
303 }; | |
304 static AlwaysTrueClosure always_true; | |
305 | |
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306 void SharedHeap::process_weak_roots(OopClosure* root_closure) { |
0 | 307 // Global (weak) JNI handles |
308 JNIHandles::weak_oops_do(&always_true, root_closure); | |
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309 } |
0 | 310 |
311 void SharedHeap::set_barrier_set(BarrierSet* bs) { | |
312 _barrier_set = bs; | |
313 // Cached barrier set for fast access in oops | |
314 oopDesc::set_bs(bs); | |
315 } | |
316 | |
317 void SharedHeap::post_initialize() { | |
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318 CollectedHeap::post_initialize(); |
0 | 319 ref_processing_init(); |
320 } | |
321 | |
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322 void SharedHeap::ref_processing_init() {} |
0 | 323 |
324 // Some utilities. | |
342
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325 void SharedHeap::print_size_transition(outputStream* out, |
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326 size_t bytes_before, |
0 | 327 size_t bytes_after, |
328 size_t capacity) { | |
342
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329 out->print(" %d%s->%d%s(%d%s)", |
0 | 330 byte_size_in_proper_unit(bytes_before), |
331 proper_unit_for_byte_size(bytes_before), | |
332 byte_size_in_proper_unit(bytes_after), | |
333 proper_unit_for_byte_size(bytes_after), | |
334 byte_size_in_proper_unit(capacity), | |
335 proper_unit_for_byte_size(capacity)); | |
336 } |