Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/ptrQueue.hpp @ 20731:42c091d63c72
8048949: Requeue queue implementation
Summary: devirtualize flush and move calls
Reviewed-by: brutisso, tschatzl, mschoene
Contributed-by: kim.barrett@oracle.com
author | tschatzl |
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date | Mon, 04 Aug 2014 10:49:40 -0400 |
parents | 55fb97c4c58d |
children | 7848fc12602b |
rev | line source |
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342 | 1 /* |
20731 | 2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_PTRQUEUE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_PTRQUEUE_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "utilities/sizes.hpp" | |
30 | |
342 | 31 // There are various techniques that require threads to be able to log |
32 // addresses. For example, a generational write barrier might log | |
33 // the addresses of modified old-generation objects. This type supports | |
34 // this operation. | |
35 | |
1111 | 36 // The definition of placement operator new(size_t, void*) in the <new>. |
37 #include <new> | |
38 | |
342 | 39 class PtrQueueSet; |
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40 class PtrQueue VALUE_OBJ_CLASS_SPEC { |
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41 friend class VMStructs; |
342 | 42 |
43 protected: | |
44 // The ptr queue set to which this queue belongs. | |
45 PtrQueueSet* _qset; | |
46 | |
47 // Whether updates should be logged. | |
48 bool _active; | |
49 | |
50 // The buffer. | |
51 void** _buf; | |
52 // The index at which an object was last enqueued. Starts at "_sz" | |
53 // (indicating an empty buffer) and goes towards zero. | |
54 size_t _index; | |
55 | |
56 // The size of the buffer. | |
57 size_t _sz; | |
58 | |
59 // If true, the queue is permanent, and doesn't need to deallocate | |
60 // its buffer in the destructor (since that obtains a lock which may not | |
61 // be legally locked by then. | |
62 bool _perm; | |
63 | |
64 // If there is a lock associated with this buffer, this is that lock. | |
65 Mutex* _lock; | |
66 | |
67 PtrQueueSet* qset() { return _qset; } | |
20731 | 68 bool is_permanent() const { return _perm; } |
69 | |
70 // Process queue entries and release resources, if not permanent. | |
71 void flush_impl(); | |
342 | 72 |
73 public: | |
74 // Initialize this queue to contain a null buffer, and be part of the | |
75 // given PtrQueueSet. | |
2149 | 76 PtrQueue(PtrQueueSet* qset, bool perm = false, bool active = false); |
20731 | 77 |
78 // Requires queue flushed or permanent. | |
79 ~PtrQueue(); | |
342 | 80 |
81 // Associate a lock with a ptr queue. | |
82 void set_lock(Mutex* lock) { _lock = lock; } | |
83 | |
84 void reset() { if (_buf != NULL) _index = _sz; } | |
85 | |
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86 void enqueue(volatile void* ptr) { |
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87 enqueue((void*)(ptr)); |
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88 } |
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89 |
342 | 90 // Enqueues the given "obj". |
91 void enqueue(void* ptr) { | |
92 if (!_active) return; | |
93 else enqueue_known_active(ptr); | |
94 } | |
95 | |
2149 | 96 // This method is called when we're doing the zero index handling |
97 // and gives a chance to the queues to do any pre-enqueueing | |
98 // processing they might want to do on the buffer. It should return | |
99 // true if the buffer should be enqueued, or false if enough | |
100 // entries were cleared from it so that it can be re-used. It should | |
101 // not return false if the buffer is still full (otherwise we can | |
102 // get into an infinite loop). | |
103 virtual bool should_enqueue_buffer() { return true; } | |
1111 | 104 void handle_zero_index(); |
342 | 105 void locking_enqueue_completed_buffer(void** buf); |
106 | |
107 void enqueue_known_active(void* ptr); | |
108 | |
109 size_t size() { | |
110 assert(_sz >= _index, "Invariant."); | |
111 return _buf == NULL ? 0 : _sz - _index; | |
112 } | |
113 | |
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114 bool is_empty() { |
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115 return _buf == NULL || _sz == _index; |
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116 } |
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117 |
342 | 118 // Set the "active" property of the queue to "b". An enqueue to an |
119 // inactive thread is a no-op. Setting a queue to inactive resets its | |
120 // log to the empty state. | |
121 void set_active(bool b) { | |
122 _active = b; | |
123 if (!b && _buf != NULL) { | |
124 _index = _sz; | |
125 } else if (b && _buf != NULL) { | |
126 assert(_index == _sz, "invariant: queues are empty when activated."); | |
127 } | |
128 } | |
129 | |
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130 bool is_active() { return _active; } |
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131 |
342 | 132 static int byte_index_to_index(int ind) { |
133 assert((ind % oopSize) == 0, "Invariant."); | |
134 return ind / oopSize; | |
135 } | |
136 | |
137 static int index_to_byte_index(int byte_ind) { | |
138 return byte_ind * oopSize; | |
139 } | |
140 | |
141 // To support compiler. | |
142 static ByteSize byte_offset_of_index() { | |
143 return byte_offset_of(PtrQueue, _index); | |
144 } | |
145 static ByteSize byte_width_of_index() { return in_ByteSize(sizeof(size_t)); } | |
146 | |
147 static ByteSize byte_offset_of_buf() { | |
148 return byte_offset_of(PtrQueue, _buf); | |
149 } | |
150 static ByteSize byte_width_of_buf() { return in_ByteSize(sizeof(void*)); } | |
151 | |
152 static ByteSize byte_offset_of_active() { | |
153 return byte_offset_of(PtrQueue, _active); | |
154 } | |
155 static ByteSize byte_width_of_active() { return in_ByteSize(sizeof(bool)); } | |
156 | |
157 }; | |
158 | |
1111 | 159 class BufferNode { |
160 size_t _index; | |
161 BufferNode* _next; | |
162 public: | |
163 BufferNode() : _index(0), _next(NULL) { } | |
164 BufferNode* next() const { return _next; } | |
165 void set_next(BufferNode* n) { _next = n; } | |
166 size_t index() const { return _index; } | |
167 void set_index(size_t i) { _index = i; } | |
168 | |
169 // Align the size of the structure to the size of the pointer | |
170 static size_t aligned_size() { | |
171 static const size_t alignment = round_to(sizeof(BufferNode), sizeof(void*)); | |
172 return alignment; | |
173 } | |
174 | |
175 // BufferNode is allocated before the buffer. | |
176 // The chunk of memory that holds both of them is a block. | |
177 | |
178 // Produce a new BufferNode given a buffer. | |
179 static BufferNode* new_from_buffer(void** buf) { | |
180 return new (make_block_from_buffer(buf)) BufferNode; | |
181 } | |
182 | |
183 // The following are the required conversion routines: | |
184 static BufferNode* make_node_from_buffer(void** buf) { | |
185 return (BufferNode*)make_block_from_buffer(buf); | |
186 } | |
187 static void** make_buffer_from_node(BufferNode *node) { | |
188 return make_buffer_from_block(node); | |
189 } | |
190 static void* make_block_from_node(BufferNode *node) { | |
191 return (void*)node; | |
192 } | |
193 static void** make_buffer_from_block(void* p) { | |
194 return (void**)((char*)p + aligned_size()); | |
195 } | |
196 static void* make_block_from_buffer(void** p) { | |
197 return (void*)((char*)p - aligned_size()); | |
198 } | |
199 }; | |
200 | |
342 | 201 // A PtrQueueSet represents resources common to a set of pointer queues. |
202 // In particular, the individual queues allocate buffers from this shared | |
203 // set, and return completed buffers to the set. | |
204 // All these variables are are protected by the TLOQ_CBL_mon. XXX ??? | |
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205 class PtrQueueSet VALUE_OBJ_CLASS_SPEC { |
342 | 206 protected: |
207 Monitor* _cbl_mon; // Protects the fields below. | |
1111 | 208 BufferNode* _completed_buffers_head; |
209 BufferNode* _completed_buffers_tail; | |
210 int _n_completed_buffers; | |
211 int _process_completed_threshold; | |
342 | 212 volatile bool _process_completed; |
213 | |
214 // This (and the interpretation of the first element as a "next" | |
215 // pointer) are protected by the TLOQ_FL_lock. | |
216 Mutex* _fl_lock; | |
1111 | 217 BufferNode* _buf_free_list; |
342 | 218 size_t _buf_free_list_sz; |
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219 // Queue set can share a freelist. The _fl_owner variable |
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220 // specifies the owner. It is set to "this" by default. |
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221 PtrQueueSet* _fl_owner; |
342 | 222 |
223 // The size of all buffers in the set. | |
224 size_t _sz; | |
225 | |
226 bool _all_active; | |
227 | |
228 // If true, notify_all on _cbl_mon when the threshold is reached. | |
229 bool _notify_when_complete; | |
230 | |
231 // Maximum number of elements allowed on completed queue: after that, | |
232 // enqueuer does the work itself. Zero indicates no maximum. | |
233 int _max_completed_queue; | |
1111 | 234 int _completed_queue_padding; |
342 | 235 |
236 int completed_buffers_list_length(); | |
237 void assert_completed_buffer_list_len_correct_locked(); | |
238 void assert_completed_buffer_list_len_correct(); | |
239 | |
240 protected: | |
241 // A mutator thread does the the work of processing a buffer. | |
242 // Returns "true" iff the work is complete (and the buffer may be | |
243 // deallocated). | |
244 virtual bool mut_process_buffer(void** buf) { | |
245 ShouldNotReachHere(); | |
246 return false; | |
247 } | |
248 | |
249 public: | |
250 // Create an empty ptr queue set. | |
251 PtrQueueSet(bool notify_when_complete = false); | |
252 | |
253 // Because of init-order concerns, we can't pass these as constructor | |
254 // arguments. | |
255 void initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
1111 | 256 int process_completed_threshold, |
257 int max_completed_queue, | |
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258 PtrQueueSet *fl_owner = NULL) { |
342 | 259 _max_completed_queue = max_completed_queue; |
1111 | 260 _process_completed_threshold = process_completed_threshold; |
261 _completed_queue_padding = 0; | |
342 | 262 assert(cbl_mon != NULL && fl_lock != NULL, "Init order issue?"); |
616
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263 _cbl_mon = cbl_mon; |
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264 _fl_lock = fl_lock; |
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265 _fl_owner = (fl_owner != NULL) ? fl_owner : this; |
342 | 266 } |
267 | |
268 // Return an empty oop array of size _sz (required to be non-zero). | |
269 void** allocate_buffer(); | |
270 | |
271 // Return an empty buffer to the free list. The "buf" argument is | |
272 // required to be a pointer to the head of an array of length "_sz". | |
273 void deallocate_buffer(void** buf); | |
274 | |
275 // Declares that "buf" is a complete buffer. | |
1111 | 276 void enqueue_complete_buffer(void** buf, size_t index = 0); |
277 | |
278 // To be invoked by the mutator. | |
279 bool process_or_enqueue_complete_buffer(void** buf); | |
342 | 280 |
281 bool completed_buffers_exist_dirty() { | |
282 return _n_completed_buffers > 0; | |
283 } | |
284 | |
285 bool process_completed_buffers() { return _process_completed; } | |
1111 | 286 void set_process_completed(bool x) { _process_completed = x; } |
342 | 287 |
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288 bool is_active() { return _all_active; } |
342 | 289 |
290 // Set the buffer size. Should be called before any "enqueue" operation | |
291 // can be called. And should only be called once. | |
292 void set_buffer_size(size_t sz); | |
293 | |
294 // Get the buffer size. | |
295 size_t buffer_size() { return _sz; } | |
296 | |
1111 | 297 // Get/Set the number of completed buffers that triggers log processing. |
298 void set_process_completed_threshold(int sz) { _process_completed_threshold = sz; } | |
299 int process_completed_threshold() const { return _process_completed_threshold; } | |
342 | 300 |
301 // Must only be called at a safe point. Indicates that the buffer free | |
302 // list size may be reduced, if that is deemed desirable. | |
303 void reduce_free_list(); | |
304 | |
1111 | 305 int completed_buffers_num() { return _n_completed_buffers; } |
616
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306 |
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307 void merge_bufferlists(PtrQueueSet* src); |
1111 | 308 |
309 void set_max_completed_queue(int m) { _max_completed_queue = m; } | |
310 int max_completed_queue() { return _max_completed_queue; } | |
311 | |
312 void set_completed_queue_padding(int padding) { _completed_queue_padding = padding; } | |
313 int completed_queue_padding() { return _completed_queue_padding; } | |
314 | |
315 // Notify the consumer if the number of buffers crossed the threshold | |
316 void notify_if_necessary(); | |
342 | 317 }; |
1972 | 318 |
319 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_PTRQUEUE_HPP |