Mercurial > hg > truffle
annotate src/share/vm/memory/sharedHeap.hpp @ 11969:c65045599519
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Reviewed-by: coleenp, bpittore
author | dholmes |
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date | Thu, 25 Jul 2013 21:05:29 -0400 |
parents | 71180a6e5080 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2012, 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 #ifndef SHARE_VM_MEMORY_SHAREDHEAP_HPP |
26 #define SHARE_VM_MEMORY_SHAREDHEAP_HPP | |
27 | |
28 #include "gc_interface/collectedHeap.hpp" | |
29 #include "memory/generation.hpp" | |
30 | |
0 | 31 // A "SharedHeap" is an implementation of a java heap for HotSpot. This |
32 // is an abstract class: there may be many different kinds of heaps. This | |
33 // class defines the functions that a heap must implement, and contains | |
34 // infrastructure common to all heaps. | |
35 | |
36 class Generation; | |
37 class BarrierSet; | |
38 class GenRemSet; | |
39 class Space; | |
40 class SpaceClosure; | |
41 class OopClosure; | |
42 class OopsInGenClosure; | |
43 class ObjectClosure; | |
44 class SubTasksDone; | |
45 class WorkGang; | |
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46 class FlexibleWorkGang; |
0 | 47 class CollectorPolicy; |
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48 class KlassClosure; |
0 | 49 |
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50 // Note on use of FlexibleWorkGang's for GC. |
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51 // There are three places where task completion is determined. |
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52 // In |
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53 // 1) ParallelTaskTerminator::offer_termination() where _n_threads |
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54 // must be set to the correct value so that count of workers that |
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55 // have offered termination will exactly match the number |
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56 // working on the task. Tasks such as those derived from GCTask |
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57 // use ParallelTaskTerminator's. Tasks that want load balancing |
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58 // by work stealing use this method to gauge completion. |
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59 // 2) SubTasksDone has a variable _n_threads that is used in |
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60 // all_tasks_completed() to determine completion. all_tasks_complete() |
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61 // counts the number of tasks that have been done and then reset |
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62 // the SubTasksDone so that it can be used again. When the number of |
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63 // tasks is set to the number of GC workers, then _n_threads must |
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64 // be set to the number of active GC workers. G1CollectedHeap, |
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65 // HRInto_G1RemSet, GenCollectedHeap and SharedHeap have SubTasksDone. |
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66 // This seems too many. |
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67 // 3) SequentialSubTasksDone has an _n_threads that is used in |
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68 // a way similar to SubTasksDone and has the same dependency on the |
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69 // number of active GC workers. CompactibleFreeListSpace and Space |
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70 // have SequentialSubTasksDone's. |
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71 // Example of using SubTasksDone and SequentialSubTasksDone |
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72 // G1CollectedHeap::g1_process_strong_roots() calls |
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73 // process_strong_roots(false, // no scoping; this is parallel code |
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74 // is_scavenging, so, |
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75 // &buf_scan_non_heap_roots, |
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76 // &eager_scan_code_roots); |
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77 // which delegates to SharedHeap::process_strong_roots() and uses |
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78 // SubTasksDone* _process_strong_tasks to claim tasks. |
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79 // process_strong_roots() calls |
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80 // rem_set()->younger_refs_iterate() |
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81 // to scan the card table and which eventually calls down into |
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82 // CardTableModRefBS::par_non_clean_card_iterate_work(). This method |
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83 // uses SequentialSubTasksDone* _pst to claim tasks. |
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84 // Both SubTasksDone and SequentialSubTasksDone call their method |
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85 // all_tasks_completed() to count the number of GC workers that have |
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86 // finished their work. That logic is "when all the workers are |
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87 // finished the tasks are finished". |
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88 // |
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89 // The pattern that appears in the code is to set _n_threads |
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90 // to a value > 1 before a task that you would like executed in parallel |
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91 // and then to set it to 0 after that task has completed. A value of |
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92 // 0 is a "special" value in set_n_threads() which translates to |
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93 // setting _n_threads to 1. |
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94 // |
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95 // Some code uses _n_terminiation to decide if work should be done in |
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96 // parallel. The notorious possibly_parallel_oops_do() in threads.cpp |
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97 // is an example of such code. Look for variable "is_par" for other |
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98 // examples. |
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99 // |
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100 // The active_workers is not reset to 0 after a parallel phase. It's |
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101 // value may be used in later phases and in one instance at least |
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102 // (the parallel remark) it has to be used (the parallel remark depends |
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103 // on the partitioning done in the previous parallel scavenge). |
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104 |
0 | 105 class SharedHeap : public CollectedHeap { |
106 friend class VMStructs; | |
107 | |
342 | 108 friend class VM_GC_Operation; |
109 friend class VM_CGC_Operation; | |
110 | |
0 | 111 private: |
112 // For claiming strong_roots tasks. | |
113 SubTasksDone* _process_strong_tasks; | |
114 | |
115 protected: | |
116 // There should be only a single instance of "SharedHeap" in a program. | |
117 // This is enforced with the protected constructor below, which will also | |
118 // set the static pointer "_sh" to that instance. | |
119 static SharedHeap* _sh; | |
120 | |
121 // and the Gen Remembered Set, at least one good enough to scan the perm | |
122 // gen. | |
123 GenRemSet* _rem_set; | |
124 | |
125 // A gc policy, controls global gc resource issues | |
126 CollectorPolicy *_collector_policy; | |
127 | |
128 // See the discussion below, in the specification of the reader function | |
129 // for this variable. | |
130 int _strong_roots_parity; | |
131 | |
132 // If we're doing parallel GC, use this gang of threads. | |
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133 FlexibleWorkGang* _workers; |
0 | 134 |
135 // Full initialization is done in a concrete subtype's "initialize" | |
136 // function. | |
137 SharedHeap(CollectorPolicy* policy_); | |
138 | |
342 | 139 // Returns true if the calling thread holds the heap lock, |
140 // or the calling thread is a par gc thread and the heap_lock is held | |
141 // by the vm thread doing a gc operation. | |
142 bool heap_lock_held_for_gc(); | |
143 // True if the heap_lock is held by the a non-gc thread invoking a gc | |
144 // operation. | |
145 bool _thread_holds_heap_lock_for_gc; | |
146 | |
0 | 147 public: |
148 static SharedHeap* heap() { return _sh; } | |
149 | |
150 void set_barrier_set(BarrierSet* bs); | |
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151 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
0 | 152 |
153 // Does operations required after initialization has been done. | |
154 virtual void post_initialize(); | |
155 | |
156 // Initialization of ("weak") reference processing support | |
157 virtual void ref_processing_init(); | |
158 | |
159 // This function returns the "GenRemSet" object that allows us to scan | |
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160 // generations in a fully generational heap. |
0 | 161 GenRemSet* rem_set() { return _rem_set; } |
162 | |
163 // Iteration functions. | |
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164 void oop_iterate(ExtendedOopClosure* cl) = 0; |
0 | 165 |
166 // Same as above, restricted to a memory region. | |
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167 virtual void oop_iterate(MemRegion mr, ExtendedOopClosure* cl) = 0; |
0 | 168 |
169 // Iterate over all spaces in use in the heap, in an undefined order. | |
170 virtual void space_iterate(SpaceClosure* cl) = 0; | |
171 | |
172 // A SharedHeap will contain some number of spaces. This finds the | |
173 // space whose reserved area contains the given address, or else returns | |
174 // NULL. | |
175 virtual Space* space_containing(const void* addr) const = 0; | |
176 | |
177 bool no_gc_in_progress() { return !is_gc_active(); } | |
178 | |
179 // Some collectors will perform "process_strong_roots" in parallel. | |
180 // Such a call will involve claiming some fine-grained tasks, such as | |
181 // scanning of threads. To make this process simpler, we provide the | |
182 // "strong_roots_parity()" method. Collectors that start parallel tasks | |
183 // whose threads invoke "process_strong_roots" must | |
184 // call "change_strong_roots_parity" in sequential code starting such a | |
185 // task. (This also means that a parallel thread may only call | |
186 // process_strong_roots once.) | |
187 // | |
188 // For calls to process_strong_roots by sequential code, the parity is | |
189 // updated automatically. | |
190 // | |
191 // The idea is that objects representing fine-grained tasks, such as | |
192 // threads, will contain a "parity" field. A task will is claimed in the | |
193 // current "process_strong_roots" call only if its parity field is the | |
194 // same as the "strong_roots_parity"; task claiming is accomplished by | |
195 // updating the parity field to the strong_roots_parity with a CAS. | |
196 // | |
197 // If the client meats this spec, then strong_roots_parity() will have | |
198 // the following properties: | |
199 // a) to return a different value than was returned before the last | |
200 // call to change_strong_roots_parity, and | |
201 // c) to never return a distinguished value (zero) with which such | |
202 // task-claiming variables may be initialized, to indicate "never | |
203 // claimed". | |
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204 private: |
0 | 205 void change_strong_roots_parity(); |
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206 public: |
0 | 207 int strong_roots_parity() { return _strong_roots_parity; } |
208 | |
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209 // Call these in sequential code around process_strong_roots. |
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210 // strong_roots_prologue calls change_strong_roots_parity, if |
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211 // parallel tasks are enabled. |
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212 class StrongRootsScope : public MarkingCodeBlobClosure::MarkScope { |
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213 public: |
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214 StrongRootsScope(SharedHeap* outer, bool activate = true); |
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215 ~StrongRootsScope(); |
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216 }; |
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217 friend class StrongRootsScope; |
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218 |
0 | 219 enum ScanningOption { |
220 SO_None = 0x0, | |
221 SO_AllClasses = 0x1, | |
222 SO_SystemClasses = 0x2, | |
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223 SO_Strings = 0x4, |
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224 SO_CodeCache = 0x8 |
0 | 225 }; |
226 | |
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227 FlexibleWorkGang* workers() const { return _workers; } |
0 | 228 |
229 // Invoke the "do_oop" method the closure "roots" on all root locations. | |
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230 // The "so" argument determines which roots the closure is applied to: |
0 | 231 // "SO_None" does none; |
232 // "SO_AllClasses" applies the closure to all entries in the SystemDictionary; | |
233 // "SO_SystemClasses" to all the "system" classes and loaders; | |
234 // "SO_Strings" applies the closure to all entries in StringTable; | |
235 // "SO_CodeCache" applies the closure to all elements of the CodeCache. | |
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236 void process_strong_roots(bool activate_scope, |
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237 bool is_scavenging, |
0 | 238 ScanningOption so, |
239 OopClosure* roots, | |
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240 CodeBlobClosure* code_roots, |
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241 KlassClosure* klass_closure); |
0 | 242 |
243 // Apply "blk" to all the weak roots of the system. These include | |
244 // JNI weak roots, the code cache, system dictionary, symbol table, | |
245 // string table. | |
246 void process_weak_roots(OopClosure* root_closure, | |
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247 CodeBlobClosure* code_roots); |
0 | 248 |
249 // The functions below are helper functions that a subclass of | |
250 // "SharedHeap" can use in the implementation of its virtual | |
251 // functions. | |
252 | |
342 | 253 public: |
0 | 254 |
255 // Do anything common to GC's. | |
256 virtual void gc_prologue(bool full) = 0; | |
257 virtual void gc_epilogue(bool full) = 0; | |
258 | |
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259 // Sets the number of parallel threads that will be doing tasks |
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260 // (such as process strong roots) subsequently. |
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261 virtual void set_par_threads(uint t); |
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262 |
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263 int n_termination(); |
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264 void set_n_termination(int t); |
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265 |
0 | 266 // |
267 // New methods from CollectedHeap | |
268 // | |
269 | |
270 // Some utilities. | |
342 | 271 void print_size_transition(outputStream* out, |
272 size_t bytes_before, | |
0 | 273 size_t bytes_after, |
274 size_t capacity); | |
275 }; | |
1972 | 276 |
277 #endif // SHARE_VM_MEMORY_SHAREDHEAP_HPP |