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annotate src/share/vm/utilities/taskqueue.hpp @ 7788:dbbe8ce3bfa5
commands: accept 'server0' as a vm, accept version number which have '-...' suffix (-internal, -ea...)
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Wed, 13 Feb 2013 18:33:54 +0100 |
parents | 3dfffc8b9722 |
children | 83f27710f5f7 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 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_UTILITIES_TASKQUEUE_HPP |
26 #define SHARE_VM_UTILITIES_TASKQUEUE_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "memory/allocation.inline.hpp" | |
30 #include "runtime/mutex.hpp" | |
31 #include "utilities/stack.hpp" | |
32 #ifdef TARGET_OS_ARCH_linux_x86 | |
33 # include "orderAccess_linux_x86.inline.hpp" | |
34 #endif | |
35 #ifdef TARGET_OS_ARCH_linux_sparc | |
36 # include "orderAccess_linux_sparc.inline.hpp" | |
37 #endif | |
38 #ifdef TARGET_OS_ARCH_linux_zero | |
39 # include "orderAccess_linux_zero.inline.hpp" | |
40 #endif | |
41 #ifdef TARGET_OS_ARCH_solaris_x86 | |
42 # include "orderAccess_solaris_x86.inline.hpp" | |
43 #endif | |
44 #ifdef TARGET_OS_ARCH_solaris_sparc | |
45 # include "orderAccess_solaris_sparc.inline.hpp" | |
46 #endif | |
47 #ifdef TARGET_OS_ARCH_windows_x86 | |
48 # include "orderAccess_windows_x86.inline.hpp" | |
49 #endif | |
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50 #ifdef TARGET_OS_ARCH_linux_arm |
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51 # include "orderAccess_linux_arm.inline.hpp" |
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52 #endif |
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53 #ifdef TARGET_OS_ARCH_linux_ppc |
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54 # include "orderAccess_linux_ppc.inline.hpp" |
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55 #endif |
3960 | 56 #ifdef TARGET_OS_ARCH_bsd_x86 |
57 # include "orderAccess_bsd_x86.inline.hpp" | |
58 #endif | |
59 #ifdef TARGET_OS_ARCH_bsd_zero | |
60 # include "orderAccess_bsd_zero.inline.hpp" | |
61 #endif | |
1972 | 62 |
1665 | 63 // Simple TaskQueue stats that are collected by default in debug builds. |
64 | |
65 #if !defined(TASKQUEUE_STATS) && defined(ASSERT) | |
66 #define TASKQUEUE_STATS 1 | |
67 #elif !defined(TASKQUEUE_STATS) | |
68 #define TASKQUEUE_STATS 0 | |
69 #endif | |
70 | |
71 #if TASKQUEUE_STATS | |
72 #define TASKQUEUE_STATS_ONLY(code) code | |
73 #else | |
74 #define TASKQUEUE_STATS_ONLY(code) | |
75 #endif // TASKQUEUE_STATS | |
76 | |
77 #if TASKQUEUE_STATS | |
78 class TaskQueueStats { | |
79 public: | |
80 enum StatId { | |
81 push, // number of taskqueue pushes | |
82 pop, // number of taskqueue pops | |
83 pop_slow, // subset of taskqueue pops that were done slow-path | |
84 steal_attempt, // number of taskqueue steal attempts | |
85 steal, // number of taskqueue steals | |
86 overflow, // number of overflow pushes | |
87 overflow_max_len, // max length of overflow stack | |
88 last_stat_id | |
89 }; | |
90 | |
91 public: | |
92 inline TaskQueueStats() { reset(); } | |
93 | |
94 inline void record_push() { ++_stats[push]; } | |
95 inline void record_pop() { ++_stats[pop]; } | |
96 inline void record_pop_slow() { record_pop(); ++_stats[pop_slow]; } | |
97 inline void record_steal(bool success); | |
98 inline void record_overflow(size_t new_length); | |
99 | |
1709 | 100 TaskQueueStats & operator +=(const TaskQueueStats & addend); |
101 | |
1665 | 102 inline size_t get(StatId id) const { return _stats[id]; } |
103 inline const size_t* get() const { return _stats; } | |
104 | |
105 inline void reset(); | |
106 | |
1709 | 107 // Print the specified line of the header (does not include a line separator). |
1665 | 108 static void print_header(unsigned int line, outputStream* const stream = tty, |
109 unsigned int width = 10); | |
1709 | 110 // Print the statistics (does not include a line separator). |
1665 | 111 void print(outputStream* const stream = tty, unsigned int width = 10) const; |
112 | |
1709 | 113 DEBUG_ONLY(void verify() const;) |
114 | |
1665 | 115 private: |
116 size_t _stats[last_stat_id]; | |
117 static const char * const _names[last_stat_id]; | |
118 }; | |
119 | |
120 void TaskQueueStats::record_steal(bool success) { | |
121 ++_stats[steal_attempt]; | |
122 if (success) ++_stats[steal]; | |
123 } | |
124 | |
125 void TaskQueueStats::record_overflow(size_t new_len) { | |
126 ++_stats[overflow]; | |
127 if (new_len > _stats[overflow_max_len]) _stats[overflow_max_len] = new_len; | |
128 } | |
129 | |
130 void TaskQueueStats::reset() { | |
131 memset(_stats, 0, sizeof(_stats)); | |
132 } | |
133 #endif // TASKQUEUE_STATS | |
134 | |
6197 | 135 template <unsigned int N, MEMFLAGS F> |
136 class TaskQueueSuper: public CHeapObj<F> { | |
0 | 137 protected: |
907 | 138 // Internal type for indexing the queue; also used for the tag. |
139 typedef NOT_LP64(uint16_t) LP64_ONLY(uint32_t) idx_t; | |
140 | |
141 // The first free element after the last one pushed (mod N). | |
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142 volatile uint _bottom; |
0 | 143 |
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144 enum { MOD_N_MASK = N - 1 }; |
907 | 145 |
146 class Age { | |
147 public: | |
148 Age(size_t data = 0) { _data = data; } | |
149 Age(const Age& age) { _data = age._data; } | |
150 Age(idx_t top, idx_t tag) { _fields._top = top; _fields._tag = tag; } | |
0 | 151 |
907 | 152 Age get() const volatile { return _data; } |
153 void set(Age age) volatile { _data = age._data; } | |
154 | |
155 idx_t top() const volatile { return _fields._top; } | |
156 idx_t tag() const volatile { return _fields._tag; } | |
0 | 157 |
907 | 158 // Increment top; if it wraps, increment tag also. |
159 void increment() { | |
160 _fields._top = increment_index(_fields._top); | |
161 if (_fields._top == 0) ++_fields._tag; | |
162 } | |
0 | 163 |
907 | 164 Age cmpxchg(const Age new_age, const Age old_age) volatile { |
165 return (size_t) Atomic::cmpxchg_ptr((intptr_t)new_age._data, | |
166 (volatile intptr_t *)&_data, | |
167 (intptr_t)old_age._data); | |
168 } | |
169 | |
170 bool operator ==(const Age& other) const { return _data == other._data; } | |
0 | 171 |
907 | 172 private: |
173 struct fields { | |
174 idx_t _top; | |
175 idx_t _tag; | |
176 }; | |
177 union { | |
178 size_t _data; | |
179 fields _fields; | |
180 }; | |
0 | 181 }; |
907 | 182 |
183 volatile Age _age; | |
184 | |
185 // These both operate mod N. | |
186 static uint increment_index(uint ind) { | |
187 return (ind + 1) & MOD_N_MASK; | |
0 | 188 } |
907 | 189 static uint decrement_index(uint ind) { |
190 return (ind - 1) & MOD_N_MASK; | |
0 | 191 } |
192 | |
907 | 193 // Returns a number in the range [0..N). If the result is "N-1", it should be |
194 // interpreted as 0. | |
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195 uint dirty_size(uint bot, uint top) const { |
907 | 196 return (bot - top) & MOD_N_MASK; |
0 | 197 } |
198 | |
199 // Returns the size corresponding to the given "bot" and "top". | |
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200 uint size(uint bot, uint top) const { |
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201 uint sz = dirty_size(bot, top); |
907 | 202 // Has the queue "wrapped", so that bottom is less than top? There's a |
203 // complicated special case here. A pair of threads could perform pop_local | |
204 // and pop_global operations concurrently, starting from a state in which | |
205 // _bottom == _top+1. The pop_local could succeed in decrementing _bottom, | |
206 // and the pop_global in incrementing _top (in which case the pop_global | |
207 // will be awarded the contested queue element.) The resulting state must | |
208 // be interpreted as an empty queue. (We only need to worry about one such | |
209 // event: only the queue owner performs pop_local's, and several concurrent | |
210 // threads attempting to perform the pop_global will all perform the same | |
211 // CAS, and only one can succeed.) Any stealing thread that reads after | |
212 // either the increment or decrement will see an empty queue, and will not | |
213 // join the competitors. The "sz == -1 || sz == N-1" state will not be | |
214 // modified by concurrent queues, so the owner thread can reset the state to | |
215 // _bottom == top so subsequent pushes will be performed normally. | |
216 return (sz == N - 1) ? 0 : sz; | |
0 | 217 } |
218 | |
219 public: | |
220 TaskQueueSuper() : _bottom(0), _age() {} | |
221 | |
1638 | 222 // Return true if the TaskQueue contains/does not contain any tasks. |
223 bool peek() const { return _bottom != _age.top(); } | |
224 bool is_empty() const { return size() == 0; } | |
0 | 225 |
226 // Return an estimate of the number of elements in the queue. | |
227 // The "careful" version admits the possibility of pop_local/pop_global | |
228 // races. | |
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229 uint size() const { |
907 | 230 return size(_bottom, _age.top()); |
0 | 231 } |
232 | |
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233 uint dirty_size() const { |
907 | 234 return dirty_size(_bottom, _age.top()); |
0 | 235 } |
236 | |
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237 void set_empty() { |
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238 _bottom = 0; |
907 | 239 _age.set(0); |
342
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240 } |
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241 |
0 | 242 // Maximum number of elements allowed in the queue. This is two less |
243 // than the actual queue size, for somewhat complicated reasons. | |
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244 uint max_elems() const { return N - 2; } |
1284 | 245 |
246 // Total size of queue. | |
247 static const uint total_size() { return N; } | |
1665 | 248 |
249 TASKQUEUE_STATS_ONLY(TaskQueueStats stats;) | |
0 | 250 }; |
251 | |
6197 | 252 |
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253 |
6197 | 254 template <class E, MEMFLAGS F, unsigned int N = TASKQUEUE_SIZE> |
255 class GenericTaskQueue: public TaskQueueSuper<N, F> { | |
256 protected: | |
257 typedef typename TaskQueueSuper<N, F>::Age Age; | |
258 typedef typename TaskQueueSuper<N, F>::idx_t idx_t; | |
259 | |
260 using TaskQueueSuper<N, F>::_bottom; | |
261 using TaskQueueSuper<N, F>::_age; | |
262 using TaskQueueSuper<N, F>::increment_index; | |
263 using TaskQueueSuper<N, F>::decrement_index; | |
264 using TaskQueueSuper<N, F>::dirty_size; | |
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265 |
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266 public: |
6197 | 267 using TaskQueueSuper<N, F>::max_elems; |
268 using TaskQueueSuper<N, F>::size; | |
269 | |
270 #if TASKQUEUE_STATS | |
271 using TaskQueueSuper<N, F>::stats; | |
272 #endif | |
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273 |
0 | 274 private: |
275 // Slow paths for push, pop_local. (pop_global has no fast path.) | |
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276 bool push_slow(E t, uint dirty_n_elems); |
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277 bool pop_local_slow(uint localBot, Age oldAge); |
0 | 278 |
279 public: | |
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280 typedef E element_type; |
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281 |
0 | 282 // Initializes the queue to empty. |
283 GenericTaskQueue(); | |
284 | |
285 void initialize(); | |
286 | |
1638 | 287 // Push the task "t" on the queue. Returns "false" iff the queue is full. |
0 | 288 inline bool push(E t); |
289 | |
1638 | 290 // Attempts to claim a task from the "local" end of the queue (the most |
291 // recently pushed). If successful, returns true and sets t to the task; | |
292 // otherwise, returns false (the queue is empty). | |
0 | 293 inline bool pop_local(E& t); |
294 | |
1638 | 295 // Like pop_local(), but uses the "global" end of the queue (the least |
296 // recently pushed). | |
0 | 297 bool pop_global(E& t); |
298 | |
299 // Delete any resource associated with the queue. | |
300 ~GenericTaskQueue(); | |
301 | |
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302 // apply the closure to all elements in the task queue |
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303 void oops_do(OopClosure* f); |
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304 |
0 | 305 private: |
306 // Element array. | |
307 volatile E* _elems; | |
308 }; | |
309 | |
6197 | 310 template<class E, MEMFLAGS F, unsigned int N> |
311 GenericTaskQueue<E, F, N>::GenericTaskQueue() { | |
907 | 312 assert(sizeof(Age) == sizeof(size_t), "Depends on this."); |
0 | 313 } |
314 | |
6197 | 315 template<class E, MEMFLAGS F, unsigned int N> |
316 void GenericTaskQueue<E, F, N>::initialize() { | |
317 _elems = NEW_C_HEAP_ARRAY(E, N, F); | |
0 | 318 } |
319 | |
6197 | 320 template<class E, MEMFLAGS F, unsigned int N> |
321 void GenericTaskQueue<E, F, N>::oops_do(OopClosure* f) { | |
342
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322 // tty->print_cr("START OopTaskQueue::oops_do"); |
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323 uint iters = size(); |
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324 uint index = _bottom; |
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325 for (uint i = 0; i < iters; ++i) { |
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326 index = decrement_index(index); |
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327 // tty->print_cr(" doing entry %d," INTPTR_T " -> " INTPTR_T, |
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328 // index, &_elems[index], _elems[index]); |
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329 E* t = (E*)&_elems[index]; // cast away volatility |
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330 oop* p = (oop*)t; |
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331 assert((*t)->is_oop_or_null(), "Not an oop or null"); |
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332 f->do_oop(p); |
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333 } |
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334 // tty->print_cr("END OopTaskQueue::oops_do"); |
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335 } |
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336 |
6197 | 337 template<class E, MEMFLAGS F, unsigned int N> |
338 bool GenericTaskQueue<E, F, N>::push_slow(E t, uint dirty_n_elems) { | |
907 | 339 if (dirty_n_elems == N - 1) { |
0 | 340 // Actually means 0, so do the push. |
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341 uint localBot = _bottom; |
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342 // g++ complains if the volatile result of the assignment is unused. |
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343 const_cast<E&>(_elems[localBot] = t); |
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344 OrderAccess::release_store(&_bottom, increment_index(localBot)); |
1665 | 345 TASKQUEUE_STATS_ONLY(stats.record_push()); |
0 | 346 return true; |
907 | 347 } |
348 return false; | |
0 | 349 } |
350 | |
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351 // pop_local_slow() is done by the owning thread and is trying to |
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352 // get the last task in the queue. It will compete with pop_global() |
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353 // that will be used by other threads. The tag age is incremented |
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354 // whenever the queue goes empty which it will do here if this thread |
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355 // gets the last task or in pop_global() if the queue wraps (top == 0 |
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356 // and pop_global() succeeds, see pop_global()). |
6197 | 357 template<class E, MEMFLAGS F, unsigned int N> |
358 bool GenericTaskQueue<E, F, N>::pop_local_slow(uint localBot, Age oldAge) { | |
0 | 359 // This queue was observed to contain exactly one element; either this |
360 // thread will claim it, or a competing "pop_global". In either case, | |
361 // the queue will be logically empty afterwards. Create a new Age value | |
362 // that represents the empty queue for the given value of "_bottom". (We | |
363 // must also increment "tag" because of the case where "bottom == 1", | |
364 // "top == 0". A pop_global could read the queue element in that case, | |
365 // then have the owner thread do a pop followed by another push. Without | |
366 // the incrementing of "tag", the pop_global's CAS could succeed, | |
367 // allowing it to believe it has claimed the stale element.) | |
907 | 368 Age newAge((idx_t)localBot, oldAge.tag() + 1); |
0 | 369 // Perhaps a competing pop_global has already incremented "top", in which |
370 // case it wins the element. | |
371 if (localBot == oldAge.top()) { | |
372 // No competing pop_global has yet incremented "top"; we'll try to | |
373 // install new_age, thus claiming the element. | |
907 | 374 Age tempAge = _age.cmpxchg(newAge, oldAge); |
0 | 375 if (tempAge == oldAge) { |
376 // We win. | |
907 | 377 assert(dirty_size(localBot, _age.top()) != N - 1, "sanity"); |
1665 | 378 TASKQUEUE_STATS_ONLY(stats.record_pop_slow()); |
0 | 379 return true; |
380 } | |
381 } | |
907 | 382 // We lose; a completing pop_global gets the element. But the queue is empty |
383 // and top is greater than bottom. Fix this representation of the empty queue | |
384 // to become the canonical one. | |
385 _age.set(newAge); | |
386 assert(dirty_size(localBot, _age.top()) != N - 1, "sanity"); | |
0 | 387 return false; |
388 } | |
389 | |
6197 | 390 template<class E, MEMFLAGS F, unsigned int N> |
391 bool GenericTaskQueue<E, F, N>::pop_global(E& t) { | |
907 | 392 Age oldAge = _age.get(); |
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393 uint localBot = _bottom; |
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394 uint n_elems = size(localBot, oldAge.top()); |
0 | 395 if (n_elems == 0) { |
396 return false; | |
397 } | |
907 | 398 |
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399 const_cast<E&>(t = _elems[oldAge.top()]); |
907 | 400 Age newAge(oldAge); |
401 newAge.increment(); | |
402 Age resAge = _age.cmpxchg(newAge, oldAge); | |
403 | |
0 | 404 // Note that using "_bottom" here might fail, since a pop_local might |
405 // have decremented it. | |
907 | 406 assert(dirty_size(localBot, newAge.top()) != N - 1, "sanity"); |
407 return resAge == oldAge; | |
0 | 408 } |
409 | |
6197 | 410 template<class E, MEMFLAGS F, unsigned int N> |
411 GenericTaskQueue<E, F, N>::~GenericTaskQueue() { | |
412 FREE_C_HEAP_ARRAY(E, _elems, F); | |
0 | 413 } |
414 | |
1638 | 415 // OverflowTaskQueue is a TaskQueue that also includes an overflow stack for |
416 // elements that do not fit in the TaskQueue. | |
417 // | |
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418 // This class hides two methods from super classes: |
1638 | 419 // |
420 // push() - push onto the task queue or, if that fails, onto the overflow stack | |
421 // is_empty() - return true if both the TaskQueue and overflow stack are empty | |
422 // | |
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423 // Note that size() is not hidden--it returns the number of elements in the |
1638 | 424 // TaskQueue, and does not include the size of the overflow stack. This |
425 // simplifies replacement of GenericTaskQueues with OverflowTaskQueues. | |
6197 | 426 template<class E, MEMFLAGS F, unsigned int N = TASKQUEUE_SIZE> |
427 class OverflowTaskQueue: public GenericTaskQueue<E, F, N> | |
1638 | 428 { |
429 public: | |
6197 | 430 typedef Stack<E, F> overflow_t; |
431 typedef GenericTaskQueue<E, F, N> taskqueue_t; | |
1638 | 432 |
1665 | 433 TASKQUEUE_STATS_ONLY(using taskqueue_t::stats;) |
434 | |
1638 | 435 // Push task t onto the queue or onto the overflow stack. Return true. |
436 inline bool push(E t); | |
437 | |
438 // Attempt to pop from the overflow stack; return true if anything was popped. | |
439 inline bool pop_overflow(E& t); | |
440 | |
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441 inline overflow_t* overflow_stack() { return &_overflow_stack; } |
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442 |
1638 | 443 inline bool taskqueue_empty() const { return taskqueue_t::is_empty(); } |
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444 inline bool overflow_empty() const { return _overflow_stack.is_empty(); } |
1638 | 445 inline bool is_empty() const { |
446 return taskqueue_empty() && overflow_empty(); | |
447 } | |
448 | |
449 private: | |
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450 overflow_t _overflow_stack; |
1638 | 451 }; |
452 | |
6197 | 453 template <class E, MEMFLAGS F, unsigned int N> |
454 bool OverflowTaskQueue<E, F, N>::push(E t) | |
1638 | 455 { |
456 if (!taskqueue_t::push(t)) { | |
457 overflow_stack()->push(t); | |
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458 TASKQUEUE_STATS_ONLY(stats.record_overflow(overflow_stack()->size())); |
1638 | 459 } |
460 return true; | |
461 } | |
462 | |
6197 | 463 template <class E, MEMFLAGS F, unsigned int N> |
464 bool OverflowTaskQueue<E, F, N>::pop_overflow(E& t) | |
1638 | 465 { |
466 if (overflow_empty()) return false; | |
467 t = overflow_stack()->pop(); | |
468 return true; | |
469 } | |
470 | |
6197 | 471 class TaskQueueSetSuper { |
0 | 472 protected: |
473 static int randomParkAndMiller(int* seed0); | |
474 public: | |
475 // Returns "true" if some TaskQueue in the set contains a task. | |
476 virtual bool peek() = 0; | |
477 }; | |
478 | |
6197 | 479 template <MEMFLAGS F> class TaskQueueSetSuperImpl: public CHeapObj<F>, public TaskQueueSetSuper { |
480 }; | |
481 | |
482 template<class T, MEMFLAGS F> | |
483 class GenericTaskQueueSet: public TaskQueueSetSuperImpl<F> { | |
0 | 484 private: |
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485 uint _n; |
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486 T** _queues; |
0 | 487 |
488 public: | |
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489 typedef typename T::element_type E; |
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490 |
0 | 491 GenericTaskQueueSet(int n) : _n(n) { |
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492 typedef T* GenericTaskQueuePtr; |
6197 | 493 _queues = NEW_C_HEAP_ARRAY(GenericTaskQueuePtr, n, F); |
0 | 494 for (int i = 0; i < n; i++) { |
495 _queues[i] = NULL; | |
496 } | |
497 } | |
498 | |
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499 bool steal_best_of_2(uint queue_num, int* seed, E& t); |
0 | 500 |
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501 void register_queue(uint i, T* q); |
0 | 502 |
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503 T* queue(uint n); |
0 | 504 |
1638 | 505 // The thread with queue number "queue_num" (and whose random number seed is |
506 // at "seed") is trying to steal a task from some other queue. (It may try | |
507 // several queues, according to some configuration parameter.) If some steal | |
508 // succeeds, returns "true" and sets "t" to the stolen task, otherwise returns | |
509 // false. | |
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510 bool steal(uint queue_num, int* seed, E& t); |
0 | 511 |
512 bool peek(); | |
513 }; | |
514 | |
6197 | 515 template<class T, MEMFLAGS F> void |
516 GenericTaskQueueSet<T, F>::register_queue(uint i, T* q) { | |
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517 assert(i < _n, "index out of range."); |
0 | 518 _queues[i] = q; |
519 } | |
520 | |
6197 | 521 template<class T, MEMFLAGS F> T* |
522 GenericTaskQueueSet<T, F>::queue(uint i) { | |
0 | 523 return _queues[i]; |
524 } | |
525 | |
6197 | 526 template<class T, MEMFLAGS F> bool |
527 GenericTaskQueueSet<T, F>::steal(uint queue_num, int* seed, E& t) { | |
1665 | 528 for (uint i = 0; i < 2 * _n; i++) { |
529 if (steal_best_of_2(queue_num, seed, t)) { | |
530 TASKQUEUE_STATS_ONLY(queue(queue_num)->stats.record_steal(true)); | |
0 | 531 return true; |
1665 | 532 } |
533 } | |
534 TASKQUEUE_STATS_ONLY(queue(queue_num)->stats.record_steal(false)); | |
0 | 535 return false; |
536 } | |
537 | |
6197 | 538 template<class T, MEMFLAGS F> bool |
539 GenericTaskQueueSet<T, F>::steal_best_of_2(uint queue_num, int* seed, E& t) { | |
0 | 540 if (_n > 2) { |
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541 uint k1 = queue_num; |
6197 | 542 while (k1 == queue_num) k1 = TaskQueueSetSuper::randomParkAndMiller(seed) % _n; |
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543 uint k2 = queue_num; |
6197 | 544 while (k2 == queue_num || k2 == k1) k2 = TaskQueueSetSuper::randomParkAndMiller(seed) % _n; |
0 | 545 // Sample both and try the larger. |
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546 uint sz1 = _queues[k1]->size(); |
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547 uint sz2 = _queues[k2]->size(); |
0 | 548 if (sz2 > sz1) return _queues[k2]->pop_global(t); |
549 else return _queues[k1]->pop_global(t); | |
550 } else if (_n == 2) { | |
551 // Just try the other one. | |
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552 uint k = (queue_num + 1) % 2; |
0 | 553 return _queues[k]->pop_global(t); |
554 } else { | |
555 assert(_n == 1, "can't be zero."); | |
556 return false; | |
557 } | |
558 } | |
559 | |
6197 | 560 template<class T, MEMFLAGS F> |
561 bool GenericTaskQueueSet<T, F>::peek() { | |
0 | 562 // Try all the queues. |
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563 for (uint j = 0; j < _n; j++) { |
0 | 564 if (_queues[j]->peek()) |
565 return true; | |
566 } | |
567 return false; | |
568 } | |
569 | |
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570 // When to terminate from the termination protocol. |
6197 | 571 class TerminatorTerminator: public CHeapObj<mtInternal> { |
342
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572 public: |
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573 virtual bool should_exit_termination() = 0; |
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574 }; |
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575 |
0 | 576 // A class to aid in the termination of a set of parallel tasks using |
577 // TaskQueueSet's for work stealing. | |
578 | |
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579 #undef TRACESPINNING |
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580 |
0 | 581 class ParallelTaskTerminator: public StackObj { |
582 private: | |
583 int _n_threads; | |
584 TaskQueueSetSuper* _queue_set; | |
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585 int _offered_termination; |
0 | 586 |
546
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587 #ifdef TRACESPINNING |
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588 static uint _total_yields; |
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589 static uint _total_spins; |
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590 static uint _total_peeks; |
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591 #endif |
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592 |
0 | 593 bool peek_in_queue_set(); |
594 protected: | |
595 virtual void yield(); | |
596 void sleep(uint millis); | |
597 | |
598 public: | |
599 | |
600 // "n_threads" is the number of threads to be terminated. "queue_set" is a | |
601 // queue sets of work queues of other threads. | |
602 ParallelTaskTerminator(int n_threads, TaskQueueSetSuper* queue_set); | |
603 | |
604 // The current thread has no work, and is ready to terminate if everyone | |
605 // else is. If returns "true", all threads are terminated. If returns | |
606 // "false", available work has been observed in one of the task queues, | |
607 // so the global task is not complete. | |
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608 bool offer_termination() { |
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609 return offer_termination(NULL); |
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610 } |
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611 |
907 | 612 // As above, but it also terminates if the should_exit_termination() |
342
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613 // method of the terminator parameter returns true. If terminator is |
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614 // NULL, then it is ignored. |
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615 bool offer_termination(TerminatorTerminator* terminator); |
0 | 616 |
617 // Reset the terminator, so that it may be reused again. | |
618 // The caller is responsible for ensuring that this is done | |
619 // in an MT-safe manner, once the previous round of use of | |
620 // the terminator is finished. | |
621 void reset_for_reuse(); | |
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622 // Same as above but the number of parallel threads is set to the |
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623 // given number. |
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624 void reset_for_reuse(int n_threads); |
0 | 625 |
546
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626 #ifdef TRACESPINNING |
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627 static uint total_yields() { return _total_yields; } |
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628 static uint total_spins() { return _total_spins; } |
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629 static uint total_peeks() { return _total_peeks; } |
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630 static void print_termination_counts(); |
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631 #endif |
0 | 632 }; |
633 | |
6197 | 634 template<class E, MEMFLAGS F, unsigned int N> inline bool |
635 GenericTaskQueue<E, F, N>::push(E t) { | |
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636 uint localBot = _bottom; |
907 | 637 assert((localBot >= 0) && (localBot < N), "_bottom out of range."); |
638 idx_t top = _age.top(); | |
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639 uint dirty_n_elems = dirty_size(localBot, top); |
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640 assert(dirty_n_elems < N, "n_elems out of range."); |
0 | 641 if (dirty_n_elems < max_elems()) { |
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642 // g++ complains if the volatile result of the assignment is unused. |
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643 const_cast<E&>(_elems[localBot] = t); |
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644 OrderAccess::release_store(&_bottom, increment_index(localBot)); |
1665 | 645 TASKQUEUE_STATS_ONLY(stats.record_push()); |
0 | 646 return true; |
647 } else { | |
648 return push_slow(t, dirty_n_elems); | |
649 } | |
650 } | |
651 | |
6197 | 652 template<class E, MEMFLAGS F, unsigned int N> inline bool |
653 GenericTaskQueue<E, F, N>::pop_local(E& t) { | |
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654 uint localBot = _bottom; |
907 | 655 // This value cannot be N-1. That can only occur as a result of |
0 | 656 // the assignment to bottom in this method. If it does, this method |
1638 | 657 // resets the size to 0 before the next call (which is sequential, |
0 | 658 // since this is pop_local.) |
907 | 659 uint dirty_n_elems = dirty_size(localBot, _age.top()); |
660 assert(dirty_n_elems != N - 1, "Shouldn't be possible..."); | |
0 | 661 if (dirty_n_elems == 0) return false; |
662 localBot = decrement_index(localBot); | |
663 _bottom = localBot; | |
664 // This is necessary to prevent any read below from being reordered | |
665 // before the store just above. | |
666 OrderAccess::fence(); | |
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667 const_cast<E&>(t = _elems[localBot]); |
0 | 668 // This is a second read of "age"; the "size()" above is the first. |
669 // If there's still at least one element in the queue, based on the | |
670 // "_bottom" and "age" we've read, then there can be no interference with | |
671 // a "pop_global" operation, and we're done. | |
907 | 672 idx_t tp = _age.top(); // XXX |
0 | 673 if (size(localBot, tp) > 0) { |
907 | 674 assert(dirty_size(localBot, tp) != N - 1, "sanity"); |
1665 | 675 TASKQUEUE_STATS_ONLY(stats.record_pop()); |
0 | 676 return true; |
677 } else { | |
678 // Otherwise, the queue contained exactly one element; we take the slow | |
679 // path. | |
907 | 680 return pop_local_slow(localBot, _age.get()); |
0 | 681 } |
682 } | |
683 | |
6197 | 684 typedef GenericTaskQueue<oop, mtGC> OopTaskQueue; |
685 typedef GenericTaskQueueSet<OopTaskQueue, mtGC> OopTaskQueueSet; | |
0 | 686 |
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687 #ifdef _MSC_VER |
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688 #pragma warning(push) |
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689 // warning C4522: multiple assignment operators specified |
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690 #pragma warning(disable:4522) |
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691 #endif |
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692 |
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693 // This is a container class for either an oop* or a narrowOop*. |
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694 // Both are pushed onto a task queue and the consumer will test is_narrow() |
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695 // to determine which should be processed. |
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696 class StarTask { |
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697 void* _holder; // either union oop* or narrowOop* |
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698 |
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699 enum { COMPRESSED_OOP_MASK = 1 }; |
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700 |
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701 public: |
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702 StarTask(narrowOop* p) { |
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703 assert(((uintptr_t)p & COMPRESSED_OOP_MASK) == 0, "Information loss!"); |
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704 _holder = (void *)((uintptr_t)p | COMPRESSED_OOP_MASK); |
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705 } |
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706 StarTask(oop* p) { |
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707 assert(((uintptr_t)p & COMPRESSED_OOP_MASK) == 0, "Information loss!"); |
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708 _holder = (void*)p; |
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709 } |
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710 StarTask() { _holder = NULL; } |
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711 operator oop*() { return (oop*)_holder; } |
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712 operator narrowOop*() { |
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713 return (narrowOop*)((uintptr_t)_holder & ~COMPRESSED_OOP_MASK); |
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714 } |
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715 |
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716 StarTask& operator=(const StarTask& t) { |
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717 _holder = t._holder; |
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718 return *this; |
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719 } |
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720 volatile StarTask& operator=(const volatile StarTask& t) volatile { |
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721 _holder = t._holder; |
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722 return *this; |
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723 } |
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724 |
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725 bool is_narrow() const { |
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726 return (((uintptr_t)_holder & COMPRESSED_OOP_MASK) != 0); |
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727 } |
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728 }; |
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729 |
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730 class ObjArrayTask |
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731 { |
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732 public: |
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733 ObjArrayTask(oop o = NULL, int idx = 0): _obj(o), _index(idx) { } |
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734 ObjArrayTask(oop o, size_t idx): _obj(o), _index(int(idx)) { |
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735 assert(idx <= size_t(max_jint), "too big"); |
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736 } |
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737 ObjArrayTask(const ObjArrayTask& t): _obj(t._obj), _index(t._index) { } |
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738 |
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739 ObjArrayTask& operator =(const ObjArrayTask& t) { |
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740 _obj = t._obj; |
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741 _index = t._index; |
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742 return *this; |
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743 } |
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744 volatile ObjArrayTask& |
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745 operator =(const volatile ObjArrayTask& t) volatile { |
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746 _obj = t._obj; |
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747 _index = t._index; |
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748 return *this; |
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749 } |
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750 |
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751 inline oop obj() const { return _obj; } |
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752 inline int index() const { return _index; } |
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753 |
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754 DEBUG_ONLY(bool is_valid() const); // Tasks to be pushed/popped must be valid. |
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755 |
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756 private: |
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757 oop _obj; |
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758 int _index; |
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759 }; |
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760 |
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761 #ifdef _MSC_VER |
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762 #pragma warning(pop) |
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763 #endif |
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764 |
6197 | 765 typedef OverflowTaskQueue<StarTask, mtClass> OopStarTaskQueue; |
766 typedef GenericTaskQueueSet<OopStarTaskQueue, mtClass> OopStarTaskQueueSet; | |
0 | 767 |
6197 | 768 typedef OverflowTaskQueue<size_t, mtInternal> RegionTaskQueue; |
769 typedef GenericTaskQueueSet<RegionTaskQueue, mtClass> RegionTaskQueueSet; | |
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1972 | 771 |
772 #endif // SHARE_VM_UTILITIES_TASKQUEUE_HPP |