Mercurial > hg > graal-compiler
annotate src/share/vm/utilities/taskqueue.hpp @ 1833:8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
Summary: Associate number of GC workers with the workgang as opposed to the task.
Reviewed-by: johnc, ysr
author | jmasa |
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date | Mon, 20 Sep 2010 14:38:38 -0700 |
parents | 5f429ee79634 |
children | 894b1d7c7e01 |
rev | line source |
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0 | 1 /* |
1638 | 2 * Copyright (c) 2001, 2010, 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 | |
1665 | 25 // Simple TaskQueue stats that are collected by default in debug builds. |
26 | |
27 #if !defined(TASKQUEUE_STATS) && defined(ASSERT) | |
28 #define TASKQUEUE_STATS 1 | |
29 #elif !defined(TASKQUEUE_STATS) | |
30 #define TASKQUEUE_STATS 0 | |
31 #endif | |
32 | |
33 #if TASKQUEUE_STATS | |
34 #define TASKQUEUE_STATS_ONLY(code) code | |
35 #else | |
36 #define TASKQUEUE_STATS_ONLY(code) | |
37 #endif // TASKQUEUE_STATS | |
38 | |
39 #if TASKQUEUE_STATS | |
40 class TaskQueueStats { | |
41 public: | |
42 enum StatId { | |
43 push, // number of taskqueue pushes | |
44 pop, // number of taskqueue pops | |
45 pop_slow, // subset of taskqueue pops that were done slow-path | |
46 steal_attempt, // number of taskqueue steal attempts | |
47 steal, // number of taskqueue steals | |
48 overflow, // number of overflow pushes | |
49 overflow_max_len, // max length of overflow stack | |
50 last_stat_id | |
51 }; | |
52 | |
53 public: | |
54 inline TaskQueueStats() { reset(); } | |
55 | |
56 inline void record_push() { ++_stats[push]; } | |
57 inline void record_pop() { ++_stats[pop]; } | |
58 inline void record_pop_slow() { record_pop(); ++_stats[pop_slow]; } | |
59 inline void record_steal(bool success); | |
60 inline void record_overflow(size_t new_length); | |
61 | |
1709 | 62 TaskQueueStats & operator +=(const TaskQueueStats & addend); |
63 | |
1665 | 64 inline size_t get(StatId id) const { return _stats[id]; } |
65 inline const size_t* get() const { return _stats; } | |
66 | |
67 inline void reset(); | |
68 | |
1709 | 69 // Print the specified line of the header (does not include a line separator). |
1665 | 70 static void print_header(unsigned int line, outputStream* const stream = tty, |
71 unsigned int width = 10); | |
1709 | 72 // Print the statistics (does not include a line separator). |
1665 | 73 void print(outputStream* const stream = tty, unsigned int width = 10) const; |
74 | |
1709 | 75 DEBUG_ONLY(void verify() const;) |
76 | |
1665 | 77 private: |
78 size_t _stats[last_stat_id]; | |
79 static const char * const _names[last_stat_id]; | |
80 }; | |
81 | |
82 void TaskQueueStats::record_steal(bool success) { | |
83 ++_stats[steal_attempt]; | |
84 if (success) ++_stats[steal]; | |
85 } | |
86 | |
87 void TaskQueueStats::record_overflow(size_t new_len) { | |
88 ++_stats[overflow]; | |
89 if (new_len > _stats[overflow_max_len]) _stats[overflow_max_len] = new_len; | |
90 } | |
91 | |
92 void TaskQueueStats::reset() { | |
93 memset(_stats, 0, sizeof(_stats)); | |
94 } | |
95 #endif // TASKQUEUE_STATS | |
96 | |
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97 template <unsigned int N> |
0 | 98 class TaskQueueSuper: public CHeapObj { |
99 protected: | |
907 | 100 // Internal type for indexing the queue; also used for the tag. |
101 typedef NOT_LP64(uint16_t) LP64_ONLY(uint32_t) idx_t; | |
102 | |
103 // The first free element after the last one pushed (mod N). | |
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104 volatile uint _bottom; |
0 | 105 |
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106 enum { MOD_N_MASK = N - 1 }; |
907 | 107 |
108 class Age { | |
109 public: | |
110 Age(size_t data = 0) { _data = data; } | |
111 Age(const Age& age) { _data = age._data; } | |
112 Age(idx_t top, idx_t tag) { _fields._top = top; _fields._tag = tag; } | |
0 | 113 |
907 | 114 Age get() const volatile { return _data; } |
115 void set(Age age) volatile { _data = age._data; } | |
116 | |
117 idx_t top() const volatile { return _fields._top; } | |
118 idx_t tag() const volatile { return _fields._tag; } | |
0 | 119 |
907 | 120 // Increment top; if it wraps, increment tag also. |
121 void increment() { | |
122 _fields._top = increment_index(_fields._top); | |
123 if (_fields._top == 0) ++_fields._tag; | |
124 } | |
0 | 125 |
907 | 126 Age cmpxchg(const Age new_age, const Age old_age) volatile { |
127 return (size_t) Atomic::cmpxchg_ptr((intptr_t)new_age._data, | |
128 (volatile intptr_t *)&_data, | |
129 (intptr_t)old_age._data); | |
130 } | |
131 | |
132 bool operator ==(const Age& other) const { return _data == other._data; } | |
0 | 133 |
907 | 134 private: |
135 struct fields { | |
136 idx_t _top; | |
137 idx_t _tag; | |
138 }; | |
139 union { | |
140 size_t _data; | |
141 fields _fields; | |
142 }; | |
0 | 143 }; |
907 | 144 |
145 volatile Age _age; | |
146 | |
147 // These both operate mod N. | |
148 static uint increment_index(uint ind) { | |
149 return (ind + 1) & MOD_N_MASK; | |
0 | 150 } |
907 | 151 static uint decrement_index(uint ind) { |
152 return (ind - 1) & MOD_N_MASK; | |
0 | 153 } |
154 | |
907 | 155 // Returns a number in the range [0..N). If the result is "N-1", it should be |
156 // interpreted as 0. | |
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157 uint dirty_size(uint bot, uint top) const { |
907 | 158 return (bot - top) & MOD_N_MASK; |
0 | 159 } |
160 | |
161 // Returns the size corresponding to the given "bot" and "top". | |
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162 uint size(uint bot, uint top) const { |
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163 uint sz = dirty_size(bot, top); |
907 | 164 // Has the queue "wrapped", so that bottom is less than top? There's a |
165 // complicated special case here. A pair of threads could perform pop_local | |
166 // and pop_global operations concurrently, starting from a state in which | |
167 // _bottom == _top+1. The pop_local could succeed in decrementing _bottom, | |
168 // and the pop_global in incrementing _top (in which case the pop_global | |
169 // will be awarded the contested queue element.) The resulting state must | |
170 // be interpreted as an empty queue. (We only need to worry about one such | |
171 // event: only the queue owner performs pop_local's, and several concurrent | |
172 // threads attempting to perform the pop_global will all perform the same | |
173 // CAS, and only one can succeed.) Any stealing thread that reads after | |
174 // either the increment or decrement will see an empty queue, and will not | |
175 // join the competitors. The "sz == -1 || sz == N-1" state will not be | |
176 // modified by concurrent queues, so the owner thread can reset the state to | |
177 // _bottom == top so subsequent pushes will be performed normally. | |
178 return (sz == N - 1) ? 0 : sz; | |
0 | 179 } |
180 | |
181 public: | |
182 TaskQueueSuper() : _bottom(0), _age() {} | |
183 | |
1638 | 184 // Return true if the TaskQueue contains/does not contain any tasks. |
185 bool peek() const { return _bottom != _age.top(); } | |
186 bool is_empty() const { return size() == 0; } | |
0 | 187 |
188 // Return an estimate of the number of elements in the queue. | |
189 // The "careful" version admits the possibility of pop_local/pop_global | |
190 // races. | |
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191 uint size() const { |
907 | 192 return size(_bottom, _age.top()); |
0 | 193 } |
194 | |
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195 uint dirty_size() const { |
907 | 196 return dirty_size(_bottom, _age.top()); |
0 | 197 } |
198 | |
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199 void set_empty() { |
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200 _bottom = 0; |
907 | 201 _age.set(0); |
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202 } |
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203 |
0 | 204 // Maximum number of elements allowed in the queue. This is two less |
205 // than the actual queue size, for somewhat complicated reasons. | |
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206 uint max_elems() const { return N - 2; } |
1284 | 207 |
208 // Total size of queue. | |
209 static const uint total_size() { return N; } | |
1665 | 210 |
211 TASKQUEUE_STATS_ONLY(TaskQueueStats stats;) | |
0 | 212 }; |
213 | |
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214 template<class E, unsigned int N = TASKQUEUE_SIZE> |
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215 class GenericTaskQueue: public TaskQueueSuper<N> { |
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216 protected: |
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217 typedef typename TaskQueueSuper<N>::Age Age; |
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218 typedef typename TaskQueueSuper<N>::idx_t idx_t; |
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219 |
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220 using TaskQueueSuper<N>::_bottom; |
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221 using TaskQueueSuper<N>::_age; |
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222 using TaskQueueSuper<N>::increment_index; |
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223 using TaskQueueSuper<N>::decrement_index; |
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224 using TaskQueueSuper<N>::dirty_size; |
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225 |
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226 public: |
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227 using TaskQueueSuper<N>::max_elems; |
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228 using TaskQueueSuper<N>::size; |
1665 | 229 TASKQUEUE_STATS_ONLY(using TaskQueueSuper<N>::stats;) |
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230 |
0 | 231 private: |
232 // Slow paths for push, pop_local. (pop_global has no fast path.) | |
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233 bool push_slow(E t, uint dirty_n_elems); |
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234 bool pop_local_slow(uint localBot, Age oldAge); |
0 | 235 |
236 public: | |
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237 typedef E element_type; |
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238 |
0 | 239 // Initializes the queue to empty. |
240 GenericTaskQueue(); | |
241 | |
242 void initialize(); | |
243 | |
1638 | 244 // Push the task "t" on the queue. Returns "false" iff the queue is full. |
0 | 245 inline bool push(E t); |
246 | |
1638 | 247 // Attempts to claim a task from the "local" end of the queue (the most |
248 // recently pushed). If successful, returns true and sets t to the task; | |
249 // otherwise, returns false (the queue is empty). | |
0 | 250 inline bool pop_local(E& t); |
251 | |
1638 | 252 // Like pop_local(), but uses the "global" end of the queue (the least |
253 // recently pushed). | |
0 | 254 bool pop_global(E& t); |
255 | |
256 // Delete any resource associated with the queue. | |
257 ~GenericTaskQueue(); | |
258 | |
342
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259 // apply the closure to all elements in the task queue |
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260 void oops_do(OopClosure* f); |
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261 |
0 | 262 private: |
263 // Element array. | |
264 volatile E* _elems; | |
265 }; | |
266 | |
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267 template<class E, unsigned int N> |
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268 GenericTaskQueue<E, N>::GenericTaskQueue() { |
907 | 269 assert(sizeof(Age) == sizeof(size_t), "Depends on this."); |
0 | 270 } |
271 | |
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272 template<class E, unsigned int N> |
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273 void GenericTaskQueue<E, N>::initialize() { |
907 | 274 _elems = NEW_C_HEAP_ARRAY(E, N); |
0 | 275 } |
276 | |
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277 template<class E, unsigned int N> |
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278 void GenericTaskQueue<E, N>::oops_do(OopClosure* f) { |
342
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279 // tty->print_cr("START OopTaskQueue::oops_do"); |
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280 uint iters = size(); |
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281 uint index = _bottom; |
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282 for (uint i = 0; i < iters; ++i) { |
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283 index = decrement_index(index); |
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284 // tty->print_cr(" doing entry %d," INTPTR_T " -> " INTPTR_T, |
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285 // index, &_elems[index], _elems[index]); |
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286 E* t = (E*)&_elems[index]; // cast away volatility |
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287 oop* p = (oop*)t; |
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288 assert((*t)->is_oop_or_null(), "Not an oop or null"); |
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289 f->do_oop(p); |
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290 } |
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291 // tty->print_cr("END OopTaskQueue::oops_do"); |
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292 } |
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293 |
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294 template<class E, unsigned int N> |
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295 bool GenericTaskQueue<E, N>::push_slow(E t, uint dirty_n_elems) { |
907 | 296 if (dirty_n_elems == N - 1) { |
0 | 297 // Actually means 0, so do the push. |
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298 uint localBot = _bottom; |
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299 // g++ complains if the volatile result of the assignment is unused. |
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300 const_cast<E&>(_elems[localBot] = t); |
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301 OrderAccess::release_store(&_bottom, increment_index(localBot)); |
1665 | 302 TASKQUEUE_STATS_ONLY(stats.record_push()); |
0 | 303 return true; |
907 | 304 } |
305 return false; | |
0 | 306 } |
307 | |
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308 // pop_local_slow() is done by the owning thread and is trying to |
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309 // get the last task in the queue. It will compete with pop_global() |
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310 // that will be used by other threads. The tag age is incremented |
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311 // whenever the queue goes empty which it will do here if this thread |
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312 // gets the last task or in pop_global() if the queue wraps (top == 0 |
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313 // and pop_global() succeeds, see pop_global()). |
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314 template<class E, unsigned int N> |
1665 | 315 bool GenericTaskQueue<E, N>::pop_local_slow(uint localBot, Age oldAge) { |
0 | 316 // This queue was observed to contain exactly one element; either this |
317 // thread will claim it, or a competing "pop_global". In either case, | |
318 // the queue will be logically empty afterwards. Create a new Age value | |
319 // that represents the empty queue for the given value of "_bottom". (We | |
320 // must also increment "tag" because of the case where "bottom == 1", | |
321 // "top == 0". A pop_global could read the queue element in that case, | |
322 // then have the owner thread do a pop followed by another push. Without | |
323 // the incrementing of "tag", the pop_global's CAS could succeed, | |
324 // allowing it to believe it has claimed the stale element.) | |
907 | 325 Age newAge((idx_t)localBot, oldAge.tag() + 1); |
0 | 326 // Perhaps a competing pop_global has already incremented "top", in which |
327 // case it wins the element. | |
328 if (localBot == oldAge.top()) { | |
329 // No competing pop_global has yet incremented "top"; we'll try to | |
330 // install new_age, thus claiming the element. | |
907 | 331 Age tempAge = _age.cmpxchg(newAge, oldAge); |
0 | 332 if (tempAge == oldAge) { |
333 // We win. | |
907 | 334 assert(dirty_size(localBot, _age.top()) != N - 1, "sanity"); |
1665 | 335 TASKQUEUE_STATS_ONLY(stats.record_pop_slow()); |
0 | 336 return true; |
337 } | |
338 } | |
907 | 339 // We lose; a completing pop_global gets the element. But the queue is empty |
340 // and top is greater than bottom. Fix this representation of the empty queue | |
341 // to become the canonical one. | |
342 _age.set(newAge); | |
343 assert(dirty_size(localBot, _age.top()) != N - 1, "sanity"); | |
0 | 344 return false; |
345 } | |
346 | |
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347 template<class E, unsigned int N> |
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348 bool GenericTaskQueue<E, N>::pop_global(E& t) { |
907 | 349 Age oldAge = _age.get(); |
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350 uint localBot = _bottom; |
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351 uint n_elems = size(localBot, oldAge.top()); |
0 | 352 if (n_elems == 0) { |
353 return false; | |
354 } | |
907 | 355 |
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356 const_cast<E&>(t = _elems[oldAge.top()]); |
907 | 357 Age newAge(oldAge); |
358 newAge.increment(); | |
359 Age resAge = _age.cmpxchg(newAge, oldAge); | |
360 | |
0 | 361 // Note that using "_bottom" here might fail, since a pop_local might |
362 // have decremented it. | |
907 | 363 assert(dirty_size(localBot, newAge.top()) != N - 1, "sanity"); |
364 return resAge == oldAge; | |
0 | 365 } |
366 | |
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367 template<class E, unsigned int N> |
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368 GenericTaskQueue<E, N>::~GenericTaskQueue() { |
0 | 369 FREE_C_HEAP_ARRAY(E, _elems); |
370 } | |
371 | |
1638 | 372 // OverflowTaskQueue is a TaskQueue that also includes an overflow stack for |
373 // elements that do not fit in the TaskQueue. | |
374 // | |
375 // Three methods from super classes are overridden: | |
376 // | |
377 // initialize() - initialize the super classes and create the overflow stack | |
378 // push() - push onto the task queue or, if that fails, onto the overflow stack | |
379 // is_empty() - return true if both the TaskQueue and overflow stack are empty | |
380 // | |
381 // Note that size() is not overridden--it returns the number of elements in the | |
382 // TaskQueue, and does not include the size of the overflow stack. This | |
383 // simplifies replacement of GenericTaskQueues with OverflowTaskQueues. | |
384 template<class E, unsigned int N = TASKQUEUE_SIZE> | |
385 class OverflowTaskQueue: public GenericTaskQueue<E, N> | |
386 { | |
387 public: | |
388 typedef GrowableArray<E> overflow_t; | |
389 typedef GenericTaskQueue<E, N> taskqueue_t; | |
390 | |
1665 | 391 TASKQUEUE_STATS_ONLY(using taskqueue_t::stats;) |
392 | |
1638 | 393 OverflowTaskQueue(); |
394 ~OverflowTaskQueue(); | |
395 void initialize(); | |
396 | |
397 inline overflow_t* overflow_stack() const { return _overflow_stack; } | |
398 | |
399 // Push task t onto the queue or onto the overflow stack. Return true. | |
400 inline bool push(E t); | |
401 | |
402 // Attempt to pop from the overflow stack; return true if anything was popped. | |
403 inline bool pop_overflow(E& t); | |
404 | |
405 inline bool taskqueue_empty() const { return taskqueue_t::is_empty(); } | |
406 inline bool overflow_empty() const { return overflow_stack()->is_empty(); } | |
407 inline bool is_empty() const { | |
408 return taskqueue_empty() && overflow_empty(); | |
409 } | |
410 | |
411 private: | |
412 overflow_t* _overflow_stack; | |
413 }; | |
414 | |
415 template <class E, unsigned int N> | |
416 OverflowTaskQueue<E, N>::OverflowTaskQueue() | |
417 { | |
418 _overflow_stack = NULL; | |
419 } | |
420 | |
421 template <class E, unsigned int N> | |
422 OverflowTaskQueue<E, N>::~OverflowTaskQueue() | |
423 { | |
424 if (_overflow_stack != NULL) { | |
425 delete _overflow_stack; | |
426 _overflow_stack = NULL; | |
427 } | |
428 } | |
429 | |
430 template <class E, unsigned int N> | |
431 void OverflowTaskQueue<E, N>::initialize() | |
432 { | |
433 taskqueue_t::initialize(); | |
434 assert(_overflow_stack == NULL, "memory leak"); | |
435 _overflow_stack = new (ResourceObj::C_HEAP) GrowableArray<E>(10, true); | |
436 } | |
437 | |
438 template <class E, unsigned int N> | |
439 bool OverflowTaskQueue<E, N>::push(E t) | |
440 { | |
441 if (!taskqueue_t::push(t)) { | |
442 overflow_stack()->push(t); | |
1665 | 443 TASKQUEUE_STATS_ONLY(stats.record_overflow(overflow_stack()->length())); |
1638 | 444 } |
445 return true; | |
446 } | |
447 | |
448 template <class E, unsigned int N> | |
449 bool OverflowTaskQueue<E, N>::pop_overflow(E& t) | |
450 { | |
451 if (overflow_empty()) return false; | |
452 t = overflow_stack()->pop(); | |
453 return true; | |
454 } | |
455 | |
0 | 456 class TaskQueueSetSuper: public CHeapObj { |
457 protected: | |
458 static int randomParkAndMiller(int* seed0); | |
459 public: | |
460 // Returns "true" if some TaskQueue in the set contains a task. | |
461 virtual bool peek() = 0; | |
462 }; | |
463 | |
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464 template<class T> |
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465 class GenericTaskQueueSet: public TaskQueueSetSuper { |
0 | 466 private: |
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467 uint _n; |
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468 T** _queues; |
0 | 469 |
470 public: | |
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471 typedef typename T::element_type E; |
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472 |
0 | 473 GenericTaskQueueSet(int n) : _n(n) { |
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474 typedef T* GenericTaskQueuePtr; |
0 | 475 _queues = NEW_C_HEAP_ARRAY(GenericTaskQueuePtr, n); |
476 for (int i = 0; i < n; i++) { | |
477 _queues[i] = NULL; | |
478 } | |
479 } | |
480 | |
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481 bool steal_1_random(uint queue_num, int* seed, E& t); |
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482 bool steal_best_of_2(uint queue_num, int* seed, E& t); |
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483 bool steal_best_of_all(uint queue_num, int* seed, E& t); |
0 | 484 |
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485 void register_queue(uint i, T* q); |
0 | 486 |
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487 T* queue(uint n); |
0 | 488 |
1638 | 489 // The thread with queue number "queue_num" (and whose random number seed is |
490 // at "seed") is trying to steal a task from some other queue. (It may try | |
491 // several queues, according to some configuration parameter.) If some steal | |
492 // succeeds, returns "true" and sets "t" to the stolen task, otherwise returns | |
493 // false. | |
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494 bool steal(uint queue_num, int* seed, E& t); |
0 | 495 |
496 bool peek(); | |
497 }; | |
498 | |
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499 template<class T> void |
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500 GenericTaskQueueSet<T>::register_queue(uint i, T* q) { |
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501 assert(i < _n, "index out of range."); |
0 | 502 _queues[i] = q; |
503 } | |
504 | |
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505 template<class T> T* |
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506 GenericTaskQueueSet<T>::queue(uint i) { |
0 | 507 return _queues[i]; |
508 } | |
509 | |
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510 template<class T> bool |
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511 GenericTaskQueueSet<T>::steal(uint queue_num, int* seed, E& t) { |
1665 | 512 for (uint i = 0; i < 2 * _n; i++) { |
513 if (steal_best_of_2(queue_num, seed, t)) { | |
514 TASKQUEUE_STATS_ONLY(queue(queue_num)->stats.record_steal(true)); | |
0 | 515 return true; |
1665 | 516 } |
517 } | |
518 TASKQUEUE_STATS_ONLY(queue(queue_num)->stats.record_steal(false)); | |
0 | 519 return false; |
520 } | |
521 | |
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522 template<class T> bool |
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523 GenericTaskQueueSet<T>::steal_best_of_all(uint queue_num, int* seed, E& t) { |
0 | 524 if (_n > 2) { |
525 int best_k; | |
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526 uint best_sz = 0; |
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527 for (uint k = 0; k < _n; k++) { |
0 | 528 if (k == queue_num) continue; |
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529 uint sz = _queues[k]->size(); |
0 | 530 if (sz > best_sz) { |
531 best_sz = sz; | |
532 best_k = k; | |
533 } | |
534 } | |
535 return best_sz > 0 && _queues[best_k]->pop_global(t); | |
536 } else if (_n == 2) { | |
537 // Just try the other one. | |
538 int k = (queue_num + 1) % 2; | |
539 return _queues[k]->pop_global(t); | |
540 } else { | |
541 assert(_n == 1, "can't be zero."); | |
542 return false; | |
543 } | |
544 } | |
545 | |
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546 template<class T> bool |
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547 GenericTaskQueueSet<T>::steal_1_random(uint queue_num, int* seed, E& t) { |
0 | 548 if (_n > 2) { |
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549 uint k = queue_num; |
0 | 550 while (k == queue_num) k = randomParkAndMiller(seed) % _n; |
551 return _queues[2]->pop_global(t); | |
552 } else if (_n == 2) { | |
553 // Just try the other one. | |
554 int k = (queue_num + 1) % 2; | |
555 return _queues[k]->pop_global(t); | |
556 } else { | |
557 assert(_n == 1, "can't be zero."); | |
558 return false; | |
559 } | |
560 } | |
561 | |
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562 template<class T> bool |
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563 GenericTaskQueueSet<T>::steal_best_of_2(uint queue_num, int* seed, E& t) { |
0 | 564 if (_n > 2) { |
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565 uint k1 = queue_num; |
0 | 566 while (k1 == queue_num) k1 = randomParkAndMiller(seed) % _n; |
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567 uint k2 = queue_num; |
0 | 568 while (k2 == queue_num || k2 == k1) k2 = randomParkAndMiller(seed) % _n; |
569 // Sample both and try the larger. | |
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570 uint sz1 = _queues[k1]->size(); |
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571 uint sz2 = _queues[k2]->size(); |
0 | 572 if (sz2 > sz1) return _queues[k2]->pop_global(t); |
573 else return _queues[k1]->pop_global(t); | |
574 } else if (_n == 2) { | |
575 // Just try the other one. | |
541
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576 uint k = (queue_num + 1) % 2; |
0 | 577 return _queues[k]->pop_global(t); |
578 } else { | |
579 assert(_n == 1, "can't be zero."); | |
580 return false; | |
581 } | |
582 } | |
583 | |
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584 template<class T> |
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585 bool GenericTaskQueueSet<T>::peek() { |
0 | 586 // Try all the queues. |
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587 for (uint j = 0; j < _n; j++) { |
0 | 588 if (_queues[j]->peek()) |
589 return true; | |
590 } | |
591 return false; | |
592 } | |
593 | |
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594 // When to terminate from the termination protocol. |
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595 class TerminatorTerminator: public CHeapObj { |
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596 public: |
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597 virtual bool should_exit_termination() = 0; |
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598 }; |
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599 |
0 | 600 // A class to aid in the termination of a set of parallel tasks using |
601 // TaskQueueSet's for work stealing. | |
602 | |
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603 #undef TRACESPINNING |
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604 |
0 | 605 class ParallelTaskTerminator: public StackObj { |
606 private: | |
607 int _n_threads; | |
608 TaskQueueSetSuper* _queue_set; | |
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609 int _offered_termination; |
0 | 610 |
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611 #ifdef TRACESPINNING |
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612 static uint _total_yields; |
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613 static uint _total_spins; |
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614 static uint _total_peeks; |
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615 #endif |
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616 |
0 | 617 bool peek_in_queue_set(); |
618 protected: | |
619 virtual void yield(); | |
620 void sleep(uint millis); | |
621 | |
622 public: | |
623 | |
624 // "n_threads" is the number of threads to be terminated. "queue_set" is a | |
625 // queue sets of work queues of other threads. | |
626 ParallelTaskTerminator(int n_threads, TaskQueueSetSuper* queue_set); | |
627 | |
628 // The current thread has no work, and is ready to terminate if everyone | |
629 // else is. If returns "true", all threads are terminated. If returns | |
630 // "false", available work has been observed in one of the task queues, | |
631 // so the global task is not complete. | |
342
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632 bool offer_termination() { |
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633 return offer_termination(NULL); |
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634 } |
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635 |
907 | 636 // As above, but it also terminates if the should_exit_termination() |
342
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637 // method of the terminator parameter returns true. If terminator is |
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638 // NULL, then it is ignored. |
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639 bool offer_termination(TerminatorTerminator* terminator); |
0 | 640 |
641 // Reset the terminator, so that it may be reused again. | |
642 // The caller is responsible for ensuring that this is done | |
643 // in an MT-safe manner, once the previous round of use of | |
644 // the terminator is finished. | |
645 void reset_for_reuse(); | |
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646 // Same as above but the number of parallel threads is set to the |
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647 // given number. |
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648 void reset_for_reuse(int n_threads); |
0 | 649 |
546
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650 #ifdef TRACESPINNING |
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651 static uint total_yields() { return _total_yields; } |
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652 static uint total_spins() { return _total_spins; } |
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653 static uint total_peeks() { return _total_peeks; } |
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654 static void print_termination_counts(); |
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655 #endif |
0 | 656 }; |
657 | |
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658 template<class E, unsigned int N> inline bool |
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659 GenericTaskQueue<E, N>::push(E t) { |
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660 uint localBot = _bottom; |
907 | 661 assert((localBot >= 0) && (localBot < N), "_bottom out of range."); |
662 idx_t top = _age.top(); | |
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663 uint dirty_n_elems = dirty_size(localBot, top); |
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664 assert(dirty_n_elems < N, "n_elems out of range."); |
0 | 665 if (dirty_n_elems < max_elems()) { |
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666 // g++ complains if the volatile result of the assignment is unused. |
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667 const_cast<E&>(_elems[localBot] = t); |
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668 OrderAccess::release_store(&_bottom, increment_index(localBot)); |
1665 | 669 TASKQUEUE_STATS_ONLY(stats.record_push()); |
0 | 670 return true; |
671 } else { | |
672 return push_slow(t, dirty_n_elems); | |
673 } | |
674 } | |
675 | |
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676 template<class E, unsigned int N> inline bool |
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677 GenericTaskQueue<E, N>::pop_local(E& t) { |
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678 uint localBot = _bottom; |
907 | 679 // This value cannot be N-1. That can only occur as a result of |
0 | 680 // the assignment to bottom in this method. If it does, this method |
1638 | 681 // resets the size to 0 before the next call (which is sequential, |
0 | 682 // since this is pop_local.) |
907 | 683 uint dirty_n_elems = dirty_size(localBot, _age.top()); |
684 assert(dirty_n_elems != N - 1, "Shouldn't be possible..."); | |
0 | 685 if (dirty_n_elems == 0) return false; |
686 localBot = decrement_index(localBot); | |
687 _bottom = localBot; | |
688 // This is necessary to prevent any read below from being reordered | |
689 // before the store just above. | |
690 OrderAccess::fence(); | |
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691 const_cast<E&>(t = _elems[localBot]); |
0 | 692 // This is a second read of "age"; the "size()" above is the first. |
693 // If there's still at least one element in the queue, based on the | |
694 // "_bottom" and "age" we've read, then there can be no interference with | |
695 // a "pop_global" operation, and we're done. | |
907 | 696 idx_t tp = _age.top(); // XXX |
0 | 697 if (size(localBot, tp) > 0) { |
907 | 698 assert(dirty_size(localBot, tp) != N - 1, "sanity"); |
1665 | 699 TASKQUEUE_STATS_ONLY(stats.record_pop()); |
0 | 700 return true; |
701 } else { | |
702 // Otherwise, the queue contained exactly one element; we take the slow | |
703 // path. | |
907 | 704 return pop_local_slow(localBot, _age.get()); |
0 | 705 } |
706 } | |
707 | |
1638 | 708 typedef GenericTaskQueue<oop> OopTaskQueue; |
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709 typedef GenericTaskQueueSet<OopTaskQueue> OopTaskQueueSet; |
0 | 710 |
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711 #ifdef _MSC_VER |
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712 #pragma warning(push) |
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713 // warning C4522: multiple assignment operators specified |
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714 #pragma warning(disable:4522) |
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715 #endif |
113
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716 |
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717 // This is a container class for either an oop* or a narrowOop*. |
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718 // Both are pushed onto a task queue and the consumer will test is_narrow() |
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719 // to determine which should be processed. |
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720 class StarTask { |
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721 void* _holder; // either union oop* or narrowOop* |
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722 |
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723 enum { COMPRESSED_OOP_MASK = 1 }; |
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724 |
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725 public: |
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726 StarTask(narrowOop* p) { |
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727 assert(((uintptr_t)p & COMPRESSED_OOP_MASK) == 0, "Information loss!"); |
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728 _holder = (void *)((uintptr_t)p | COMPRESSED_OOP_MASK); |
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729 } |
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730 StarTask(oop* p) { |
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731 assert(((uintptr_t)p & COMPRESSED_OOP_MASK) == 0, "Information loss!"); |
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732 _holder = (void*)p; |
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733 } |
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734 StarTask() { _holder = NULL; } |
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735 operator oop*() { return (oop*)_holder; } |
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736 operator narrowOop*() { |
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737 return (narrowOop*)((uintptr_t)_holder & ~COMPRESSED_OOP_MASK); |
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738 } |
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739 |
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740 StarTask& operator=(const StarTask& t) { |
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741 _holder = t._holder; |
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742 return *this; |
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743 } |
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744 volatile StarTask& operator=(const volatile StarTask& t) volatile { |
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745 _holder = t._holder; |
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746 return *this; |
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747 } |
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748 |
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749 bool is_narrow() const { |
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750 return (((uintptr_t)_holder & COMPRESSED_OOP_MASK) != 0); |
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751 } |
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752 }; |
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753 |
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754 class ObjArrayTask |
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755 { |
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756 public: |
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757 ObjArrayTask(oop o = NULL, int idx = 0): _obj(o), _index(idx) { } |
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758 ObjArrayTask(oop o, size_t idx): _obj(o), _index(int(idx)) { |
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759 assert(idx <= size_t(max_jint), "too big"); |
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760 } |
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761 ObjArrayTask(const ObjArrayTask& t): _obj(t._obj), _index(t._index) { } |
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762 |
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763 ObjArrayTask& operator =(const ObjArrayTask& t) { |
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764 _obj = t._obj; |
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765 _index = t._index; |
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766 return *this; |
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767 } |
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768 volatile ObjArrayTask& |
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769 operator =(const volatile ObjArrayTask& t) volatile { |
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770 _obj = t._obj; |
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771 _index = t._index; |
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772 return *this; |
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773 } |
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774 |
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775 inline oop obj() const { return _obj; } |
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776 inline int index() const { return _index; } |
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777 |
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778 DEBUG_ONLY(bool is_valid() const); // Tasks to be pushed/popped must be valid. |
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779 |
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780 private: |
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781 oop _obj; |
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782 int _index; |
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783 }; |
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784 |
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785 #ifdef _MSC_VER |
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786 #pragma warning(pop) |
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787 #endif |
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788 |
1638 | 789 typedef OverflowTaskQueue<StarTask> OopStarTaskQueue; |
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790 typedef GenericTaskQueueSet<OopStarTaskQueue> OopStarTaskQueueSet; |
0 | 791 |
1638 | 792 typedef OverflowTaskQueue<size_t> RegionTaskQueue; |
793 typedef GenericTaskQueueSet<RegionTaskQueue> RegionTaskQueueSet; | |
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794 |