Mercurial > hg > truffle
annotate src/share/vm/utilities/taskqueue.hpp @ 9597:d5c2b20e9d73
Merge.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 07 May 2013 01:59:12 +0200 |
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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> { | |
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256 ArrayAllocator<E, F> _array_allocator; |
6197 | 257 protected: |
258 typedef typename TaskQueueSuper<N, F>::Age Age; | |
259 typedef typename TaskQueueSuper<N, F>::idx_t idx_t; | |
260 | |
261 using TaskQueueSuper<N, F>::_bottom; | |
262 using TaskQueueSuper<N, F>::_age; | |
263 using TaskQueueSuper<N, F>::increment_index; | |
264 using TaskQueueSuper<N, F>::decrement_index; | |
265 using TaskQueueSuper<N, F>::dirty_size; | |
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266 |
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267 public: |
6197 | 268 using TaskQueueSuper<N, F>::max_elems; |
269 using TaskQueueSuper<N, F>::size; | |
270 | |
271 #if TASKQUEUE_STATS | |
272 using TaskQueueSuper<N, F>::stats; | |
273 #endif | |
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274 |
0 | 275 private: |
276 // Slow paths for push, pop_local. (pop_global has no fast path.) | |
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277 bool push_slow(E t, uint dirty_n_elems); |
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278 bool pop_local_slow(uint localBot, Age oldAge); |
0 | 279 |
280 public: | |
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281 typedef E element_type; |
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282 |
0 | 283 // Initializes the queue to empty. |
284 GenericTaskQueue(); | |
285 | |
286 void initialize(); | |
287 | |
1638 | 288 // Push the task "t" on the queue. Returns "false" iff the queue is full. |
0 | 289 inline bool push(E t); |
290 | |
1638 | 291 // Attempts to claim a task from the "local" end of the queue (the most |
292 // recently pushed). If successful, returns true and sets t to the task; | |
293 // otherwise, returns false (the queue is empty). | |
0 | 294 inline bool pop_local(E& t); |
295 | |
1638 | 296 // Like pop_local(), but uses the "global" end of the queue (the least |
297 // recently pushed). | |
0 | 298 bool pop_global(E& t); |
299 | |
300 // Delete any resource associated with the queue. | |
301 ~GenericTaskQueue(); | |
302 | |
342
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303 // apply the closure to all elements in the task queue |
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304 void oops_do(OopClosure* f); |
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305 |
0 | 306 private: |
307 // Element array. | |
308 volatile E* _elems; | |
309 }; | |
310 | |
6197 | 311 template<class E, MEMFLAGS F, unsigned int N> |
312 GenericTaskQueue<E, F, N>::GenericTaskQueue() { | |
907 | 313 assert(sizeof(Age) == sizeof(size_t), "Depends on this."); |
0 | 314 } |
315 | |
6197 | 316 template<class E, MEMFLAGS F, unsigned int N> |
317 void GenericTaskQueue<E, F, N>::initialize() { | |
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318 _elems = _array_allocator.allocate(N); |
0 | 319 } |
320 | |
6197 | 321 template<class E, MEMFLAGS F, unsigned int N> |
322 void GenericTaskQueue<E, F, N>::oops_do(OopClosure* f) { | |
342
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323 // tty->print_cr("START OopTaskQueue::oops_do"); |
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324 uint iters = size(); |
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325 uint index = _bottom; |
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326 for (uint i = 0; i < iters; ++i) { |
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327 index = decrement_index(index); |
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328 // tty->print_cr(" doing entry %d," INTPTR_T " -> " INTPTR_T, |
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329 // index, &_elems[index], _elems[index]); |
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330 E* t = (E*)&_elems[index]; // cast away volatility |
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331 oop* p = (oop*)t; |
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332 assert((*t)->is_oop_or_null(), "Not an oop or null"); |
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333 f->do_oop(p); |
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334 } |
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335 // tty->print_cr("END OopTaskQueue::oops_do"); |
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336 } |
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337 |
6197 | 338 template<class E, MEMFLAGS F, unsigned int N> |
339 bool GenericTaskQueue<E, F, N>::push_slow(E t, uint dirty_n_elems) { | |
907 | 340 if (dirty_n_elems == N - 1) { |
0 | 341 // Actually means 0, so do the push. |
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342 uint localBot = _bottom; |
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343 // g++ complains if the volatile result of the assignment is unused. |
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344 const_cast<E&>(_elems[localBot] = t); |
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345 OrderAccess::release_store(&_bottom, increment_index(localBot)); |
1665 | 346 TASKQUEUE_STATS_ONLY(stats.record_push()); |
0 | 347 return true; |
907 | 348 } |
349 return false; | |
0 | 350 } |
351 | |
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352 // pop_local_slow() is done by the owning thread and is trying to |
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353 // get the last task in the queue. It will compete with pop_global() |
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354 // that will be used by other threads. The tag age is incremented |
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355 // whenever the queue goes empty which it will do here if this thread |
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356 // gets the last task or in pop_global() if the queue wraps (top == 0 |
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357 // and pop_global() succeeds, see pop_global()). |
6197 | 358 template<class E, MEMFLAGS F, unsigned int N> |
359 bool GenericTaskQueue<E, F, N>::pop_local_slow(uint localBot, Age oldAge) { | |
0 | 360 // This queue was observed to contain exactly one element; either this |
361 // thread will claim it, or a competing "pop_global". In either case, | |
362 // the queue will be logically empty afterwards. Create a new Age value | |
363 // that represents the empty queue for the given value of "_bottom". (We | |
364 // must also increment "tag" because of the case where "bottom == 1", | |
365 // "top == 0". A pop_global could read the queue element in that case, | |
366 // then have the owner thread do a pop followed by another push. Without | |
367 // the incrementing of "tag", the pop_global's CAS could succeed, | |
368 // allowing it to believe it has claimed the stale element.) | |
907 | 369 Age newAge((idx_t)localBot, oldAge.tag() + 1); |
0 | 370 // Perhaps a competing pop_global has already incremented "top", in which |
371 // case it wins the element. | |
372 if (localBot == oldAge.top()) { | |
373 // No competing pop_global has yet incremented "top"; we'll try to | |
374 // install new_age, thus claiming the element. | |
907 | 375 Age tempAge = _age.cmpxchg(newAge, oldAge); |
0 | 376 if (tempAge == oldAge) { |
377 // We win. | |
907 | 378 assert(dirty_size(localBot, _age.top()) != N - 1, "sanity"); |
1665 | 379 TASKQUEUE_STATS_ONLY(stats.record_pop_slow()); |
0 | 380 return true; |
381 } | |
382 } | |
907 | 383 // We lose; a completing pop_global gets the element. But the queue is empty |
384 // and top is greater than bottom. Fix this representation of the empty queue | |
385 // to become the canonical one. | |
386 _age.set(newAge); | |
387 assert(dirty_size(localBot, _age.top()) != N - 1, "sanity"); | |
0 | 388 return false; |
389 } | |
390 | |
6197 | 391 template<class E, MEMFLAGS F, unsigned int N> |
392 bool GenericTaskQueue<E, F, N>::pop_global(E& t) { | |
907 | 393 Age oldAge = _age.get(); |
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394 uint localBot = _bottom; |
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395 uint n_elems = size(localBot, oldAge.top()); |
0 | 396 if (n_elems == 0) { |
397 return false; | |
398 } | |
907 | 399 |
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400 const_cast<E&>(t = _elems[oldAge.top()]); |
907 | 401 Age newAge(oldAge); |
402 newAge.increment(); | |
403 Age resAge = _age.cmpxchg(newAge, oldAge); | |
404 | |
0 | 405 // Note that using "_bottom" here might fail, since a pop_local might |
406 // have decremented it. | |
907 | 407 assert(dirty_size(localBot, newAge.top()) != N - 1, "sanity"); |
408 return resAge == oldAge; | |
0 | 409 } |
410 | |
6197 | 411 template<class E, MEMFLAGS F, unsigned int N> |
412 GenericTaskQueue<E, F, N>::~GenericTaskQueue() { | |
413 FREE_C_HEAP_ARRAY(E, _elems, F); | |
0 | 414 } |
415 | |
1638 | 416 // OverflowTaskQueue is a TaskQueue that also includes an overflow stack for |
417 // elements that do not fit in the TaskQueue. | |
418 // | |
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419 // This class hides two methods from super classes: |
1638 | 420 // |
421 // push() - push onto the task queue or, if that fails, onto the overflow stack | |
422 // is_empty() - return true if both the TaskQueue and overflow stack are empty | |
423 // | |
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424 // Note that size() is not hidden--it returns the number of elements in the |
1638 | 425 // TaskQueue, and does not include the size of the overflow stack. This |
426 // simplifies replacement of GenericTaskQueues with OverflowTaskQueues. | |
6197 | 427 template<class E, MEMFLAGS F, unsigned int N = TASKQUEUE_SIZE> |
428 class OverflowTaskQueue: public GenericTaskQueue<E, F, N> | |
1638 | 429 { |
430 public: | |
6197 | 431 typedef Stack<E, F> overflow_t; |
432 typedef GenericTaskQueue<E, F, N> taskqueue_t; | |
1638 | 433 |
1665 | 434 TASKQUEUE_STATS_ONLY(using taskqueue_t::stats;) |
435 | |
1638 | 436 // Push task t onto the queue or onto the overflow stack. Return true. |
437 inline bool push(E t); | |
438 | |
439 // Attempt to pop from the overflow stack; return true if anything was popped. | |
440 inline bool pop_overflow(E& t); | |
441 | |
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442 inline overflow_t* overflow_stack() { return &_overflow_stack; } |
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443 |
1638 | 444 inline bool taskqueue_empty() const { return taskqueue_t::is_empty(); } |
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445 inline bool overflow_empty() const { return _overflow_stack.is_empty(); } |
1638 | 446 inline bool is_empty() const { |
447 return taskqueue_empty() && overflow_empty(); | |
448 } | |
449 | |
450 private: | |
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451 overflow_t _overflow_stack; |
1638 | 452 }; |
453 | |
6197 | 454 template <class E, MEMFLAGS F, unsigned int N> |
455 bool OverflowTaskQueue<E, F, N>::push(E t) | |
1638 | 456 { |
457 if (!taskqueue_t::push(t)) { | |
458 overflow_stack()->push(t); | |
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459 TASKQUEUE_STATS_ONLY(stats.record_overflow(overflow_stack()->size())); |
1638 | 460 } |
461 return true; | |
462 } | |
463 | |
6197 | 464 template <class E, MEMFLAGS F, unsigned int N> |
465 bool OverflowTaskQueue<E, F, N>::pop_overflow(E& t) | |
1638 | 466 { |
467 if (overflow_empty()) return false; | |
468 t = overflow_stack()->pop(); | |
469 return true; | |
470 } | |
471 | |
6197 | 472 class TaskQueueSetSuper { |
0 | 473 protected: |
474 static int randomParkAndMiller(int* seed0); | |
475 public: | |
476 // Returns "true" if some TaskQueue in the set contains a task. | |
477 virtual bool peek() = 0; | |
478 }; | |
479 | |
6197 | 480 template <MEMFLAGS F> class TaskQueueSetSuperImpl: public CHeapObj<F>, public TaskQueueSetSuper { |
481 }; | |
482 | |
483 template<class T, MEMFLAGS F> | |
484 class GenericTaskQueueSet: public TaskQueueSetSuperImpl<F> { | |
0 | 485 private: |
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486 uint _n; |
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487 T** _queues; |
0 | 488 |
489 public: | |
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490 typedef typename T::element_type E; |
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491 |
0 | 492 GenericTaskQueueSet(int n) : _n(n) { |
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493 typedef T* GenericTaskQueuePtr; |
6197 | 494 _queues = NEW_C_HEAP_ARRAY(GenericTaskQueuePtr, n, F); |
0 | 495 for (int i = 0; i < n; i++) { |
496 _queues[i] = NULL; | |
497 } | |
498 } | |
499 | |
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500 bool steal_best_of_2(uint queue_num, int* seed, E& t); |
0 | 501 |
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502 void register_queue(uint i, T* q); |
0 | 503 |
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504 T* queue(uint n); |
0 | 505 |
1638 | 506 // The thread with queue number "queue_num" (and whose random number seed is |
507 // at "seed") is trying to steal a task from some other queue. (It may try | |
508 // several queues, according to some configuration parameter.) If some steal | |
509 // succeeds, returns "true" and sets "t" to the stolen task, otherwise returns | |
510 // false. | |
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511 bool steal(uint queue_num, int* seed, E& t); |
0 | 512 |
513 bool peek(); | |
514 }; | |
515 | |
6197 | 516 template<class T, MEMFLAGS F> void |
517 GenericTaskQueueSet<T, F>::register_queue(uint i, T* q) { | |
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518 assert(i < _n, "index out of range."); |
0 | 519 _queues[i] = q; |
520 } | |
521 | |
6197 | 522 template<class T, MEMFLAGS F> T* |
523 GenericTaskQueueSet<T, F>::queue(uint i) { | |
0 | 524 return _queues[i]; |
525 } | |
526 | |
6197 | 527 template<class T, MEMFLAGS F> bool |
528 GenericTaskQueueSet<T, F>::steal(uint queue_num, int* seed, E& t) { | |
1665 | 529 for (uint i = 0; i < 2 * _n; i++) { |
530 if (steal_best_of_2(queue_num, seed, t)) { | |
531 TASKQUEUE_STATS_ONLY(queue(queue_num)->stats.record_steal(true)); | |
0 | 532 return true; |
1665 | 533 } |
534 } | |
535 TASKQUEUE_STATS_ONLY(queue(queue_num)->stats.record_steal(false)); | |
0 | 536 return false; |
537 } | |
538 | |
6197 | 539 template<class T, MEMFLAGS F> bool |
540 GenericTaskQueueSet<T, F>::steal_best_of_2(uint queue_num, int* seed, E& t) { | |
0 | 541 if (_n > 2) { |
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542 uint k1 = queue_num; |
6197 | 543 while (k1 == queue_num) k1 = TaskQueueSetSuper::randomParkAndMiller(seed) % _n; |
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544 uint k2 = queue_num; |
6197 | 545 while (k2 == queue_num || k2 == k1) k2 = TaskQueueSetSuper::randomParkAndMiller(seed) % _n; |
0 | 546 // Sample both and try the larger. |
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547 uint sz1 = _queues[k1]->size(); |
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548 uint sz2 = _queues[k2]->size(); |
0 | 549 if (sz2 > sz1) return _queues[k2]->pop_global(t); |
550 else return _queues[k1]->pop_global(t); | |
551 } else if (_n == 2) { | |
552 // Just try the other one. | |
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553 uint k = (queue_num + 1) % 2; |
0 | 554 return _queues[k]->pop_global(t); |
555 } else { | |
556 assert(_n == 1, "can't be zero."); | |
557 return false; | |
558 } | |
559 } | |
560 | |
6197 | 561 template<class T, MEMFLAGS F> |
562 bool GenericTaskQueueSet<T, F>::peek() { | |
0 | 563 // Try all the queues. |
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564 for (uint j = 0; j < _n; j++) { |
0 | 565 if (_queues[j]->peek()) |
566 return true; | |
567 } | |
568 return false; | |
569 } | |
570 | |
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571 // When to terminate from the termination protocol. |
6197 | 572 class TerminatorTerminator: public CHeapObj<mtInternal> { |
342
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573 public: |
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574 virtual bool should_exit_termination() = 0; |
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575 }; |
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576 |
0 | 577 // A class to aid in the termination of a set of parallel tasks using |
578 // TaskQueueSet's for work stealing. | |
579 | |
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580 #undef TRACESPINNING |
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581 |
0 | 582 class ParallelTaskTerminator: public StackObj { |
583 private: | |
584 int _n_threads; | |
585 TaskQueueSetSuper* _queue_set; | |
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586 int _offered_termination; |
0 | 587 |
546
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588 #ifdef TRACESPINNING |
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589 static uint _total_yields; |
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590 static uint _total_spins; |
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591 static uint _total_peeks; |
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592 #endif |
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593 |
0 | 594 bool peek_in_queue_set(); |
595 protected: | |
596 virtual void yield(); | |
597 void sleep(uint millis); | |
598 | |
599 public: | |
600 | |
601 // "n_threads" is the number of threads to be terminated. "queue_set" is a | |
602 // queue sets of work queues of other threads. | |
603 ParallelTaskTerminator(int n_threads, TaskQueueSetSuper* queue_set); | |
604 | |
605 // The current thread has no work, and is ready to terminate if everyone | |
606 // else is. If returns "true", all threads are terminated. If returns | |
607 // "false", available work has been observed in one of the task queues, | |
608 // so the global task is not complete. | |
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609 bool offer_termination() { |
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610 return offer_termination(NULL); |
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611 } |
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612 |
907 | 613 // As above, but it also terminates if the should_exit_termination() |
342
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614 // method of the terminator parameter returns true. If terminator is |
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615 // NULL, then it is ignored. |
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616 bool offer_termination(TerminatorTerminator* terminator); |
0 | 617 |
618 // Reset the terminator, so that it may be reused again. | |
619 // The caller is responsible for ensuring that this is done | |
620 // in an MT-safe manner, once the previous round of use of | |
621 // the terminator is finished. | |
622 void reset_for_reuse(); | |
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623 // Same as above but the number of parallel threads is set to the |
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624 // given number. |
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625 void reset_for_reuse(int n_threads); |
0 | 626 |
546
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627 #ifdef TRACESPINNING |
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628 static uint total_yields() { return _total_yields; } |
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629 static uint total_spins() { return _total_spins; } |
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630 static uint total_peeks() { return _total_peeks; } |
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631 static void print_termination_counts(); |
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632 #endif |
0 | 633 }; |
634 | |
6197 | 635 template<class E, MEMFLAGS F, unsigned int N> inline bool |
636 GenericTaskQueue<E, F, N>::push(E t) { | |
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637 uint localBot = _bottom; |
907 | 638 assert((localBot >= 0) && (localBot < N), "_bottom out of range."); |
639 idx_t top = _age.top(); | |
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640 uint dirty_n_elems = dirty_size(localBot, top); |
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641 assert(dirty_n_elems < N, "n_elems out of range."); |
0 | 642 if (dirty_n_elems < max_elems()) { |
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643 // g++ complains if the volatile result of the assignment is unused. |
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644 const_cast<E&>(_elems[localBot] = t); |
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645 OrderAccess::release_store(&_bottom, increment_index(localBot)); |
1665 | 646 TASKQUEUE_STATS_ONLY(stats.record_push()); |
0 | 647 return true; |
648 } else { | |
649 return push_slow(t, dirty_n_elems); | |
650 } | |
651 } | |
652 | |
6197 | 653 template<class E, MEMFLAGS F, unsigned int N> inline bool |
654 GenericTaskQueue<E, F, N>::pop_local(E& t) { | |
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655 uint localBot = _bottom; |
907 | 656 // This value cannot be N-1. That can only occur as a result of |
0 | 657 // the assignment to bottom in this method. If it does, this method |
1638 | 658 // resets the size to 0 before the next call (which is sequential, |
0 | 659 // since this is pop_local.) |
907 | 660 uint dirty_n_elems = dirty_size(localBot, _age.top()); |
661 assert(dirty_n_elems != N - 1, "Shouldn't be possible..."); | |
0 | 662 if (dirty_n_elems == 0) return false; |
663 localBot = decrement_index(localBot); | |
664 _bottom = localBot; | |
665 // This is necessary to prevent any read below from being reordered | |
666 // before the store just above. | |
667 OrderAccess::fence(); | |
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668 const_cast<E&>(t = _elems[localBot]); |
0 | 669 // This is a second read of "age"; the "size()" above is the first. |
670 // If there's still at least one element in the queue, based on the | |
671 // "_bottom" and "age" we've read, then there can be no interference with | |
672 // a "pop_global" operation, and we're done. | |
907 | 673 idx_t tp = _age.top(); // XXX |
0 | 674 if (size(localBot, tp) > 0) { |
907 | 675 assert(dirty_size(localBot, tp) != N - 1, "sanity"); |
1665 | 676 TASKQUEUE_STATS_ONLY(stats.record_pop()); |
0 | 677 return true; |
678 } else { | |
679 // Otherwise, the queue contained exactly one element; we take the slow | |
680 // path. | |
907 | 681 return pop_local_slow(localBot, _age.get()); |
0 | 682 } |
683 } | |
684 | |
6197 | 685 typedef GenericTaskQueue<oop, mtGC> OopTaskQueue; |
686 typedef GenericTaskQueueSet<OopTaskQueue, mtGC> OopTaskQueueSet; | |
0 | 687 |
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688 #ifdef _MSC_VER |
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689 #pragma warning(push) |
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690 // warning C4522: multiple assignment operators specified |
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691 #pragma warning(disable:4522) |
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692 #endif |
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693 |
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694 // This is a container class for either an oop* or a narrowOop*. |
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695 // Both are pushed onto a task queue and the consumer will test is_narrow() |
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696 // to determine which should be processed. |
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697 class StarTask { |
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698 void* _holder; // either union oop* or narrowOop* |
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699 |
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700 enum { COMPRESSED_OOP_MASK = 1 }; |
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701 |
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702 public: |
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703 StarTask(narrowOop* p) { |
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704 assert(((uintptr_t)p & COMPRESSED_OOP_MASK) == 0, "Information loss!"); |
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705 _holder = (void *)((uintptr_t)p | COMPRESSED_OOP_MASK); |
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706 } |
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707 StarTask(oop* p) { |
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708 assert(((uintptr_t)p & COMPRESSED_OOP_MASK) == 0, "Information loss!"); |
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709 _holder = (void*)p; |
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710 } |
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711 StarTask() { _holder = NULL; } |
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712 operator oop*() { return (oop*)_holder; } |
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713 operator narrowOop*() { |
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714 return (narrowOop*)((uintptr_t)_holder & ~COMPRESSED_OOP_MASK); |
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715 } |
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716 |
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717 StarTask& operator=(const StarTask& t) { |
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718 _holder = t._holder; |
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719 return *this; |
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720 } |
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721 volatile StarTask& operator=(const volatile StarTask& t) volatile { |
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722 _holder = t._holder; |
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723 return *this; |
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724 } |
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725 |
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726 bool is_narrow() const { |
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727 return (((uintptr_t)_holder & COMPRESSED_OOP_MASK) != 0); |
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728 } |
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729 }; |
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730 |
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731 class ObjArrayTask |
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732 { |
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733 public: |
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734 ObjArrayTask(oop o = NULL, int idx = 0): _obj(o), _index(idx) { } |
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735 ObjArrayTask(oop o, size_t idx): _obj(o), _index(int(idx)) { |
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736 assert(idx <= size_t(max_jint), "too big"); |
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737 } |
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738 ObjArrayTask(const ObjArrayTask& t): _obj(t._obj), _index(t._index) { } |
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739 |
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740 ObjArrayTask& operator =(const ObjArrayTask& t) { |
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741 _obj = t._obj; |
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742 _index = t._index; |
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743 return *this; |
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744 } |
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745 volatile ObjArrayTask& |
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746 operator =(const volatile ObjArrayTask& t) volatile { |
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747 _obj = t._obj; |
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748 _index = t._index; |
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749 return *this; |
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750 } |
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751 |
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752 inline oop obj() const { return _obj; } |
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753 inline int index() const { return _index; } |
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754 |
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755 DEBUG_ONLY(bool is_valid() const); // Tasks to be pushed/popped must be valid. |
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756 |
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757 private: |
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758 oop _obj; |
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759 int _index; |
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760 }; |
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761 |
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762 #ifdef _MSC_VER |
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763 #pragma warning(pop) |
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764 #endif |
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765 |
6197 | 766 typedef OverflowTaskQueue<StarTask, mtClass> OopStarTaskQueue; |
767 typedef GenericTaskQueueSet<OopStarTaskQueue, mtClass> OopStarTaskQueueSet; | |
0 | 768 |
6197 | 769 typedef OverflowTaskQueue<size_t, mtInternal> RegionTaskQueue; |
770 typedef GenericTaskQueueSet<RegionTaskQueue, mtClass> RegionTaskQueueSet; | |
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771 |
1972 | 772 |
773 #endif // SHARE_VM_UTILITIES_TASKQUEUE_HPP |