Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.hpp @ 6197:d2a62e0f25eb
6995781: Native Memory Tracking (Phase 1)
7151532: DCmd for hotspot native memory tracking
Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd
Reviewed-by: acorn, coleenp, fparain
| author | zgu |
|---|---|
| date | Thu, 28 Jun 2012 17:03:16 -0400 |
| parents | bca17e38de00 |
| children | b9a9ed0f8eeb |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2002, 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 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GCTASKMANAGER_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GCTASKMANAGER_HPP | |
| 27 | |
| 28 #include "runtime/mutex.hpp" | |
| 29 #include "utilities/growableArray.hpp" | |
| 30 | |
| 0 | 31 // |
| 32 // The GCTaskManager is a queue of GCTasks, and accessors | |
| 33 // to allow the queue to be accessed from many threads. | |
| 34 // | |
| 35 | |
| 36 // Forward declarations of types defined in this file. | |
| 37 class GCTask; | |
| 38 class GCTaskQueue; | |
| 39 class SynchronizedGCTaskQueue; | |
| 40 class GCTaskManager; | |
| 41 class NotifyDoneClosure; | |
| 42 // Some useful subclasses of GCTask. You can also make up your own. | |
| 43 class NoopGCTask; | |
| 44 class BarrierGCTask; | |
| 45 class ReleasingBarrierGCTask; | |
| 46 class NotifyingBarrierGCTask; | |
| 47 class WaitForBarrierGCTask; | |
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48 class IdleGCTask; |
| 0 | 49 // A free list of Monitor*'s. |
| 50 class MonitorSupply; | |
| 51 | |
| 52 // Forward declarations of classes referenced in this file via pointer. | |
| 53 class GCTaskThread; | |
| 54 class Mutex; | |
| 55 class Monitor; | |
| 56 class ThreadClosure; | |
| 57 | |
| 58 // The abstract base GCTask. | |
| 59 class GCTask : public ResourceObj { | |
| 60 public: | |
| 61 // Known kinds of GCTasks, for predicates. | |
| 62 class Kind : AllStatic { | |
| 63 public: | |
| 64 enum kind { | |
| 65 unknown_task, | |
| 66 ordinary_task, | |
| 67 barrier_task, | |
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68 noop_task, |
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69 idle_task |
| 0 | 70 }; |
| 71 static const char* to_string(kind value); | |
| 72 }; | |
| 73 private: | |
| 74 // Instance state. | |
| 75 const Kind::kind _kind; // For runtime type checking. | |
| 76 const uint _affinity; // Which worker should run task. | |
| 77 GCTask* _newer; // Tasks are on doubly-linked ... | |
| 78 GCTask* _older; // ... lists. | |
| 79 public: | |
| 80 virtual char* name() { return (char *)"task"; } | |
| 81 | |
| 82 // Abstract do_it method | |
| 83 virtual void do_it(GCTaskManager* manager, uint which) = 0; | |
| 84 // Accessors | |
| 85 Kind::kind kind() const { | |
| 86 return _kind; | |
| 87 } | |
| 88 uint affinity() const { | |
| 89 return _affinity; | |
| 90 } | |
| 91 GCTask* newer() const { | |
| 92 return _newer; | |
| 93 } | |
| 94 void set_newer(GCTask* n) { | |
| 95 _newer = n; | |
| 96 } | |
| 97 GCTask* older() const { | |
| 98 return _older; | |
| 99 } | |
| 100 void set_older(GCTask* p) { | |
| 101 _older = p; | |
| 102 } | |
| 103 // Predicates. | |
| 104 bool is_ordinary_task() const { | |
| 105 return kind()==Kind::ordinary_task; | |
| 106 } | |
| 107 bool is_barrier_task() const { | |
| 108 return kind()==Kind::barrier_task; | |
| 109 } | |
| 110 bool is_noop_task() const { | |
| 111 return kind()==Kind::noop_task; | |
| 112 } | |
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113 bool is_idle_task() const { |
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114 return kind()==Kind::idle_task; |
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115 } |
| 0 | 116 void print(const char* message) const PRODUCT_RETURN; |
| 117 protected: | |
| 118 // Constructors: Only create subclasses. | |
| 119 // An ordinary GCTask. | |
| 120 GCTask(); | |
| 121 // A GCTask of a particular kind, usually barrier or noop. | |
| 122 GCTask(Kind::kind kind); | |
| 123 // An ordinary GCTask with an affinity. | |
| 124 GCTask(uint affinity); | |
| 125 // A GCTask of a particular kind, with and affinity. | |
| 126 GCTask(Kind::kind kind, uint affinity); | |
| 127 // We want a virtual destructor because virtual methods, | |
| 128 // but since ResourceObj's don't have their destructors | |
| 129 // called, we don't have one at all. Instead we have | |
| 130 // this method, which gets called by subclasses to clean up. | |
| 131 virtual void destruct(); | |
| 132 // Methods. | |
| 133 void initialize(); | |
| 134 }; | |
| 135 | |
| 136 // A doubly-linked list of GCTasks. | |
| 137 // The list is not synchronized, because sometimes we want to | |
| 138 // build up a list and then make it available to other threads. | |
| 139 // See also: SynchronizedGCTaskQueue. | |
| 140 class GCTaskQueue : public ResourceObj { | |
| 141 private: | |
| 142 // Instance state. | |
| 143 GCTask* _insert_end; // Tasks are enqueued at this end. | |
| 144 GCTask* _remove_end; // Tasks are dequeued from this end. | |
| 145 uint _length; // The current length of the queue. | |
| 146 const bool _is_c_heap_obj; // Is this a CHeapObj? | |
| 147 public: | |
| 148 // Factory create and destroy methods. | |
| 149 // Create as ResourceObj. | |
| 150 static GCTaskQueue* create(); | |
| 151 // Create as CHeapObj. | |
| 152 static GCTaskQueue* create_on_c_heap(); | |
| 153 // Destroyer. | |
| 154 static void destroy(GCTaskQueue* that); | |
| 155 // Accessors. | |
| 156 // These just examine the state of the queue. | |
| 157 bool is_empty() const { | |
| 158 assert(((insert_end() == NULL && remove_end() == NULL) || | |
| 159 (insert_end() != NULL && remove_end() != NULL)), | |
| 160 "insert_end and remove_end don't match"); | |
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161 assert((insert_end() != NULL) || (_length == 0), "Not empty"); |
| 0 | 162 return insert_end() == NULL; |
| 163 } | |
| 164 uint length() const { | |
| 165 return _length; | |
| 166 } | |
| 167 // Methods. | |
| 168 // Enqueue one task. | |
| 169 void enqueue(GCTask* task); | |
| 170 // Enqueue a list of tasks. Empties the argument list. | |
| 171 void enqueue(GCTaskQueue* list); | |
| 172 // Dequeue one task. | |
| 173 GCTask* dequeue(); | |
| 174 // Dequeue one task, preferring one with affinity. | |
| 175 GCTask* dequeue(uint affinity); | |
| 176 protected: | |
| 177 // Constructor. Clients use factory, but there might be subclasses. | |
| 178 GCTaskQueue(bool on_c_heap); | |
| 179 // Destructor-like method. | |
| 180 // Because ResourceMark doesn't call destructors. | |
| 181 // This method cleans up like one. | |
| 182 virtual void destruct(); | |
| 183 // Accessors. | |
| 184 GCTask* insert_end() const { | |
| 185 return _insert_end; | |
| 186 } | |
| 187 void set_insert_end(GCTask* value) { | |
| 188 _insert_end = value; | |
| 189 } | |
| 190 GCTask* remove_end() const { | |
| 191 return _remove_end; | |
| 192 } | |
| 193 void set_remove_end(GCTask* value) { | |
| 194 _remove_end = value; | |
| 195 } | |
| 196 void increment_length() { | |
| 197 _length += 1; | |
| 198 } | |
| 199 void decrement_length() { | |
| 200 _length -= 1; | |
| 201 } | |
| 202 void set_length(uint value) { | |
| 203 _length = value; | |
| 204 } | |
| 205 bool is_c_heap_obj() const { | |
| 206 return _is_c_heap_obj; | |
| 207 } | |
| 208 // Methods. | |
| 209 void initialize(); | |
| 210 GCTask* remove(); // Remove from remove end. | |
| 211 GCTask* remove(GCTask* task); // Remove from the middle. | |
| 212 void print(const char* message) const PRODUCT_RETURN; | |
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213 // Debug support |
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214 void verify_length() const PRODUCT_RETURN; |
| 0 | 215 }; |
| 216 | |
| 217 // A GCTaskQueue that can be synchronized. | |
| 218 // This "has-a" GCTaskQueue and a mutex to do the exclusion. | |
| 6197 | 219 class SynchronizedGCTaskQueue : public CHeapObj<mtGC> { |
| 0 | 220 private: |
| 221 // Instance state. | |
| 222 GCTaskQueue* _unsynchronized_queue; // Has-a unsynchronized queue. | |
| 223 Monitor * _lock; // Lock to control access. | |
| 224 public: | |
| 225 // Factory create and destroy methods. | |
| 226 static SynchronizedGCTaskQueue* create(GCTaskQueue* queue, Monitor * lock) { | |
| 227 return new SynchronizedGCTaskQueue(queue, lock); | |
| 228 } | |
| 229 static void destroy(SynchronizedGCTaskQueue* that) { | |
| 230 if (that != NULL) { | |
| 231 delete that; | |
| 232 } | |
| 233 } | |
| 234 // Accessors | |
| 235 GCTaskQueue* unsynchronized_queue() const { | |
| 236 return _unsynchronized_queue; | |
| 237 } | |
| 238 Monitor * lock() const { | |
| 239 return _lock; | |
| 240 } | |
| 241 // GCTaskQueue wrapper methods. | |
| 242 // These check that you hold the lock | |
| 243 // and then call the method on the queue. | |
| 244 bool is_empty() const { | |
| 245 guarantee(own_lock(), "don't own the lock"); | |
| 246 return unsynchronized_queue()->is_empty(); | |
| 247 } | |
| 248 void enqueue(GCTask* task) { | |
| 249 guarantee(own_lock(), "don't own the lock"); | |
| 250 unsynchronized_queue()->enqueue(task); | |
| 251 } | |
| 252 void enqueue(GCTaskQueue* list) { | |
| 253 guarantee(own_lock(), "don't own the lock"); | |
| 254 unsynchronized_queue()->enqueue(list); | |
| 255 } | |
| 256 GCTask* dequeue() { | |
| 257 guarantee(own_lock(), "don't own the lock"); | |
| 258 return unsynchronized_queue()->dequeue(); | |
| 259 } | |
| 260 GCTask* dequeue(uint affinity) { | |
| 261 guarantee(own_lock(), "don't own the lock"); | |
| 262 return unsynchronized_queue()->dequeue(affinity); | |
| 263 } | |
| 264 uint length() const { | |
| 265 guarantee(own_lock(), "don't own the lock"); | |
| 266 return unsynchronized_queue()->length(); | |
| 267 } | |
| 268 // For guarantees. | |
| 269 bool own_lock() const { | |
| 270 return lock()->owned_by_self(); | |
| 271 } | |
| 272 protected: | |
| 273 // Constructor. Clients use factory, but there might be subclasses. | |
| 274 SynchronizedGCTaskQueue(GCTaskQueue* queue, Monitor * lock); | |
| 275 // Destructor. Not virtual because no virtuals. | |
| 276 ~SynchronizedGCTaskQueue(); | |
| 277 }; | |
| 278 | |
| 279 // This is an abstract base class for getting notifications | |
| 280 // when a GCTaskManager is done. | |
| 6197 | 281 class NotifyDoneClosure : public CHeapObj<mtGC> { |
| 0 | 282 public: |
| 283 // The notification callback method. | |
| 284 virtual void notify(GCTaskManager* manager) = 0; | |
| 285 protected: | |
| 286 // Constructor. | |
| 287 NotifyDoneClosure() { | |
| 288 // Nothing to do. | |
| 289 } | |
| 290 // Virtual destructor because virtual methods. | |
| 291 virtual ~NotifyDoneClosure() { | |
| 292 // Nothing to do. | |
| 293 } | |
| 294 }; | |
| 295 | |
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296 // Dynamic number of GC threads |
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297 // |
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298 // GC threads wait in get_task() for work (i.e., a task) to perform. |
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299 // When the number of GC threads was static, the number of tasks |
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300 // created to do a job was equal to or greater than the maximum |
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301 // number of GC threads (ParallelGCThreads). The job might be divided |
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302 // into a number of tasks greater than the number of GC threads for |
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303 // load balancing (i.e., over partitioning). The last task to be |
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304 // executed by a GC thread in a job is a work stealing task. A |
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305 // GC thread that gets a work stealing task continues to execute |
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306 // that task until the job is done. In the static number of GC theads |
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307 // case, tasks are added to a queue (FIFO). The work stealing tasks are |
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308 // the last to be added. Once the tasks are added, the GC threads grab |
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309 // a task and go. A single thread can do all the non-work stealing tasks |
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310 // and then execute a work stealing and wait for all the other GC threads |
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311 // to execute their work stealing task. |
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312 // In the dynamic number of GC threads implementation, idle-tasks are |
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313 // created to occupy the non-participating or "inactive" threads. An |
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314 // idle-task makes the GC thread wait on a barrier that is part of the |
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315 // GCTaskManager. The GC threads that have been "idled" in a IdleGCTask |
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316 // are released once all the active GC threads have finished their work |
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317 // stealing tasks. The GCTaskManager does not wait for all the "idled" |
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318 // GC threads to resume execution. When those GC threads do resume |
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319 // execution in the course of the thread scheduling, they call get_tasks() |
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320 // as all the other GC threads do. Because all the "idled" threads are |
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321 // not required to execute in order to finish a job, it is possible for |
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322 // a GC thread to still be "idled" when the next job is started. Such |
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323 // a thread stays "idled" for the next job. This can result in a new |
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324 // job not having all the expected active workers. For example if on |
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325 // job requests 4 active workers out of a total of 10 workers so the |
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326 // remaining 6 are "idled", if the next job requests 6 active workers |
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327 // but all 6 of the "idled" workers are still idle, then the next job |
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328 // will only get 4 active workers. |
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329 // The implementation for the parallel old compaction phase has an |
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330 // added complication. In the static case parold partitions the chunks |
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331 // ready to be filled into stacks, one for each GC thread. A GC thread |
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332 // executing a draining task (drains the stack of ready chunks) |
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333 // claims a stack according to it's id (the unique ordinal value assigned |
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334 // to each GC thread). In the dynamic case not all GC threads will |
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335 // actively participate so stacks with ready to fill chunks can only be |
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336 // given to the active threads. An initial implementation chose stacks |
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337 // number 1-n to get the ready chunks and required that GC threads |
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338 // 1-n be the active workers. This was undesirable because it required |
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339 // certain threads to participate. In the final implementation a |
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340 // list of stacks equal in number to the active workers are filled |
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341 // with ready chunks. GC threads that participate get a stack from |
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342 // the task (DrainStacksCompactionTask), empty the stack, and then add it to a |
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343 // recycling list at the end of the task. If the same GC thread gets |
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344 // a second task, it gets a second stack to drain and returns it. The |
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345 // stacks are added to a recycling list so that later stealing tasks |
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346 // for this tasks can get a stack from the recycling list. Stealing tasks |
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347 // use the stacks in its work in a way similar to the draining tasks. |
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348 // A thread is not guaranteed to get anything but a stealing task and |
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349 // a thread that only gets a stealing task has to get a stack. A failed |
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350 // implementation tried to have the GC threads keep the stack they used |
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351 // during a draining task for later use in the stealing task but that didn't |
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352 // work because as noted a thread is not guaranteed to get a draining task. |
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353 // |
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354 // For PSScavenge and ParCompactionManager the GC threads are |
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355 // held in the GCTaskThread** _thread array in GCTaskManager. |
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356 |
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357 |
| 6197 | 358 class GCTaskManager : public CHeapObj<mtGC> { |
| 0 | 359 friend class ParCompactionManager; |
| 360 friend class PSParallelCompact; | |
| 361 friend class PSScavenge; | |
| 362 friend class PSRefProcTaskExecutor; | |
| 363 friend class RefProcTaskExecutor; | |
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364 friend class GCTaskThread; |
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365 friend class IdleGCTask; |
| 0 | 366 private: |
| 367 // Instance state. | |
| 368 NotifyDoneClosure* _ndc; // Notify on completion. | |
| 369 const uint _workers; // Number of workers. | |
| 370 Monitor* _monitor; // Notification of changes. | |
| 371 SynchronizedGCTaskQueue* _queue; // Queue of tasks. | |
| 372 GCTaskThread** _thread; // Array of worker threads. | |
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373 uint _active_workers; // Number of active workers. |
| 0 | 374 uint _busy_workers; // Number of busy workers. |
| 375 uint _blocking_worker; // The worker that's blocking. | |
| 376 bool* _resource_flag; // Array of flag per threads. | |
| 377 uint _delivered_tasks; // Count of delivered tasks. | |
| 378 uint _completed_tasks; // Count of completed tasks. | |
| 379 uint _barriers; // Count of barrier tasks. | |
| 380 uint _emptied_queue; // Times we emptied the queue. | |
| 381 NoopGCTask* _noop_task; // The NoopGCTask instance. | |
| 382 uint _noop_tasks; // Count of noop tasks. | |
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383 WaitForBarrierGCTask* _idle_inactive_task;// Task for inactive workers |
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384 volatile uint _idle_workers; // Number of idled workers |
| 0 | 385 public: |
| 386 // Factory create and destroy methods. | |
| 387 static GCTaskManager* create(uint workers) { | |
| 388 return new GCTaskManager(workers); | |
| 389 } | |
| 390 static GCTaskManager* create(uint workers, NotifyDoneClosure* ndc) { | |
| 391 return new GCTaskManager(workers, ndc); | |
| 392 } | |
| 393 static void destroy(GCTaskManager* that) { | |
| 394 if (that != NULL) { | |
| 395 delete that; | |
| 396 } | |
| 397 } | |
| 398 // Accessors. | |
| 399 uint busy_workers() const { | |
| 400 return _busy_workers; | |
| 401 } | |
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402 volatile uint idle_workers() const { |
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403 return _idle_workers; |
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404 } |
| 0 | 405 // Pun between Monitor* and Mutex* |
| 406 Monitor* monitor() const { | |
| 407 return _monitor; | |
| 408 } | |
| 409 Monitor * lock() const { | |
| 410 return _monitor; | |
| 411 } | |
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412 WaitForBarrierGCTask* idle_inactive_task() { |
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413 return _idle_inactive_task; |
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414 } |
| 0 | 415 // Methods. |
| 416 // Add the argument task to be run. | |
| 417 void add_task(GCTask* task); | |
| 418 // Add a list of tasks. Removes task from the argument list. | |
| 419 void add_list(GCTaskQueue* list); | |
| 420 // Claim a task for argument worker. | |
| 421 GCTask* get_task(uint which); | |
| 422 // Note the completion of a task by the argument worker. | |
| 423 void note_completion(uint which); | |
| 424 // Is the queue blocked from handing out new tasks? | |
| 425 bool is_blocked() const { | |
| 426 return (blocking_worker() != sentinel_worker()); | |
| 427 } | |
| 428 // Request that all workers release their resources. | |
| 429 void release_all_resources(); | |
| 430 // Ask if a particular worker should release its resources. | |
| 431 bool should_release_resources(uint which); // Predicate. | |
| 432 // Note the release of resources by the argument worker. | |
| 433 void note_release(uint which); | |
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434 // Create IdleGCTasks for inactive workers and start workers |
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435 void task_idle_workers(); |
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436 // Release the workers in IdleGCTasks |
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437 void release_idle_workers(); |
| 0 | 438 // Constants. |
| 439 // A sentinel worker identifier. | |
| 440 static uint sentinel_worker() { | |
| 441 return (uint) -1; // Why isn't there a max_uint? | |
| 442 } | |
| 443 | |
| 444 // Execute the task queue and wait for the completion. | |
| 445 void execute_and_wait(GCTaskQueue* list); | |
| 446 | |
| 447 void print_task_time_stamps(); | |
| 448 void print_threads_on(outputStream* st); | |
| 449 void threads_do(ThreadClosure* tc); | |
| 450 | |
| 451 protected: | |
| 452 // Constructors. Clients use factory, but there might be subclasses. | |
| 453 // Create a GCTaskManager with the appropriate number of workers. | |
| 454 GCTaskManager(uint workers); | |
| 455 // Create a GCTaskManager that calls back when there's no more work. | |
| 456 GCTaskManager(uint workers, NotifyDoneClosure* ndc); | |
| 457 // Make virtual if necessary. | |
| 458 ~GCTaskManager(); | |
| 459 // Accessors. | |
| 460 uint workers() const { | |
| 461 return _workers; | |
| 462 } | |
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463 void set_active_workers(uint v) { |
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464 assert(v <= _workers, "Trying to set more workers active than there are"); |
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465 _active_workers = MIN2(v, _workers); |
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466 assert(v != 0, "Trying to set active workers to 0"); |
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467 _active_workers = MAX2(1U, _active_workers); |
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468 } |
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469 // Sets the number of threads that will be used in a collection |
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470 void set_active_gang(); |
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471 |
| 0 | 472 NotifyDoneClosure* notify_done_closure() const { |
| 473 return _ndc; | |
| 474 } | |
| 475 SynchronizedGCTaskQueue* queue() const { | |
| 476 return _queue; | |
| 477 } | |
| 478 NoopGCTask* noop_task() const { | |
| 479 return _noop_task; | |
| 480 } | |
| 481 // Bounds-checking per-thread data accessors. | |
| 482 GCTaskThread* thread(uint which); | |
| 483 void set_thread(uint which, GCTaskThread* value); | |
| 484 bool resource_flag(uint which); | |
| 485 void set_resource_flag(uint which, bool value); | |
| 486 // Modifier methods with some semantics. | |
| 487 // Is any worker blocking handing out new tasks? | |
| 488 uint blocking_worker() const { | |
| 489 return _blocking_worker; | |
| 490 } | |
| 491 void set_blocking_worker(uint value) { | |
| 492 _blocking_worker = value; | |
| 493 } | |
| 494 void set_unblocked() { | |
| 495 set_blocking_worker(sentinel_worker()); | |
| 496 } | |
| 497 // Count of busy workers. | |
| 498 void reset_busy_workers() { | |
| 499 _busy_workers = 0; | |
| 500 } | |
| 501 uint increment_busy_workers(); | |
| 502 uint decrement_busy_workers(); | |
| 503 // Count of tasks delivered to workers. | |
| 504 uint delivered_tasks() const { | |
| 505 return _delivered_tasks; | |
| 506 } | |
| 507 void increment_delivered_tasks() { | |
| 508 _delivered_tasks += 1; | |
| 509 } | |
| 510 void reset_delivered_tasks() { | |
| 511 _delivered_tasks = 0; | |
| 512 } | |
| 513 // Count of tasks completed by workers. | |
| 514 uint completed_tasks() const { | |
| 515 return _completed_tasks; | |
| 516 } | |
| 517 void increment_completed_tasks() { | |
| 518 _completed_tasks += 1; | |
| 519 } | |
| 520 void reset_completed_tasks() { | |
| 521 _completed_tasks = 0; | |
| 522 } | |
| 523 // Count of barrier tasks completed. | |
| 524 uint barriers() const { | |
| 525 return _barriers; | |
| 526 } | |
| 527 void increment_barriers() { | |
| 528 _barriers += 1; | |
| 529 } | |
| 530 void reset_barriers() { | |
| 531 _barriers = 0; | |
| 532 } | |
| 533 // Count of how many times the queue has emptied. | |
| 534 uint emptied_queue() const { | |
| 535 return _emptied_queue; | |
| 536 } | |
| 537 void increment_emptied_queue() { | |
| 538 _emptied_queue += 1; | |
| 539 } | |
| 540 void reset_emptied_queue() { | |
| 541 _emptied_queue = 0; | |
| 542 } | |
| 543 // Count of the number of noop tasks we've handed out, | |
| 544 // e.g., to handle resource release requests. | |
| 545 uint noop_tasks() const { | |
| 546 return _noop_tasks; | |
| 547 } | |
| 548 void increment_noop_tasks() { | |
| 549 _noop_tasks += 1; | |
| 550 } | |
| 551 void reset_noop_tasks() { | |
| 552 _noop_tasks = 0; | |
| 553 } | |
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554 void increment_idle_workers() { |
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555 _idle_workers++; |
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556 } |
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557 void decrement_idle_workers() { |
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558 _idle_workers--; |
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559 } |
| 0 | 560 // Other methods. |
| 561 void initialize(); | |
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562 |
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563 public: |
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564 // Return true if all workers are currently active. |
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565 bool all_workers_active() { return workers() == active_workers(); } |
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566 uint active_workers() const { |
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567 return _active_workers; |
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568 } |
| 0 | 569 }; |
| 570 | |
| 571 // | |
| 572 // Some exemplary GCTasks. | |
| 573 // | |
| 574 | |
| 575 // A noop task that does nothing, | |
| 576 // except take us around the GCTaskThread loop. | |
| 577 class NoopGCTask : public GCTask { | |
| 578 private: | |
| 579 const bool _is_c_heap_obj; // Is this a CHeapObj? | |
| 580 public: | |
| 581 // Factory create and destroy methods. | |
| 582 static NoopGCTask* create(); | |
| 583 static NoopGCTask* create_on_c_heap(); | |
| 584 static void destroy(NoopGCTask* that); | |
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585 |
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586 virtual char* name() { return (char *)"noop task"; } |
| 0 | 587 // Methods from GCTask. |
| 588 void do_it(GCTaskManager* manager, uint which) { | |
| 589 // Nothing to do. | |
| 590 } | |
| 591 protected: | |
| 592 // Constructor. | |
| 593 NoopGCTask(bool on_c_heap) : | |
| 594 GCTask(GCTask::Kind::noop_task), | |
| 595 _is_c_heap_obj(on_c_heap) { | |
| 596 // Nothing to do. | |
| 597 } | |
| 598 // Destructor-like method. | |
| 599 void destruct(); | |
| 600 // Accessors. | |
| 601 bool is_c_heap_obj() const { | |
| 602 return _is_c_heap_obj; | |
| 603 } | |
| 604 }; | |
| 605 | |
| 606 // A BarrierGCTask blocks other tasks from starting, | |
| 607 // and waits until it is the only task running. | |
| 608 class BarrierGCTask : public GCTask { | |
| 609 public: | |
| 610 // Factory create and destroy methods. | |
| 611 static BarrierGCTask* create() { | |
| 612 return new BarrierGCTask(); | |
| 613 } | |
| 614 static void destroy(BarrierGCTask* that) { | |
| 615 if (that != NULL) { | |
| 616 that->destruct(); | |
| 617 delete that; | |
| 618 } | |
| 619 } | |
| 620 // Methods from GCTask. | |
| 621 void do_it(GCTaskManager* manager, uint which); | |
| 622 protected: | |
| 623 // Constructor. Clients use factory, but there might be subclasses. | |
| 624 BarrierGCTask() : | |
| 625 GCTask(GCTask::Kind::barrier_task) { | |
| 626 // Nothing to do. | |
| 627 } | |
| 628 // Destructor-like method. | |
| 629 void destruct(); | |
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630 |
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631 virtual char* name() { return (char *)"barrier task"; } |
| 0 | 632 // Methods. |
| 633 // Wait for this to be the only task running. | |
| 634 void do_it_internal(GCTaskManager* manager, uint which); | |
| 635 }; | |
| 636 | |
| 637 // A ReleasingBarrierGCTask is a BarrierGCTask | |
| 638 // that tells all the tasks to release their resource areas. | |
| 639 class ReleasingBarrierGCTask : public BarrierGCTask { | |
| 640 public: | |
| 641 // Factory create and destroy methods. | |
| 642 static ReleasingBarrierGCTask* create() { | |
| 643 return new ReleasingBarrierGCTask(); | |
| 644 } | |
| 645 static void destroy(ReleasingBarrierGCTask* that) { | |
| 646 if (that != NULL) { | |
| 647 that->destruct(); | |
| 648 delete that; | |
| 649 } | |
| 650 } | |
| 651 // Methods from GCTask. | |
| 652 void do_it(GCTaskManager* manager, uint which); | |
| 653 protected: | |
| 654 // Constructor. Clients use factory, but there might be subclasses. | |
| 655 ReleasingBarrierGCTask() : | |
| 656 BarrierGCTask() { | |
| 657 // Nothing to do. | |
| 658 } | |
| 659 // Destructor-like method. | |
| 660 void destruct(); | |
| 661 }; | |
| 662 | |
| 663 // A NotifyingBarrierGCTask is a BarrierGCTask | |
| 664 // that calls a notification method when it is the only task running. | |
| 665 class NotifyingBarrierGCTask : public BarrierGCTask { | |
| 666 private: | |
| 667 // Instance state. | |
| 668 NotifyDoneClosure* _ndc; // The callback object. | |
| 669 public: | |
| 670 // Factory create and destroy methods. | |
| 671 static NotifyingBarrierGCTask* create(NotifyDoneClosure* ndc) { | |
| 672 return new NotifyingBarrierGCTask(ndc); | |
| 673 } | |
| 674 static void destroy(NotifyingBarrierGCTask* that) { | |
| 675 if (that != NULL) { | |
| 676 that->destruct(); | |
| 677 delete that; | |
| 678 } | |
| 679 } | |
| 680 // Methods from GCTask. | |
| 681 void do_it(GCTaskManager* manager, uint which); | |
| 682 protected: | |
| 683 // Constructor. Clients use factory, but there might be subclasses. | |
| 684 NotifyingBarrierGCTask(NotifyDoneClosure* ndc) : | |
| 685 BarrierGCTask(), | |
| 686 _ndc(ndc) { | |
| 687 assert(notify_done_closure() != NULL, "can't notify on NULL"); | |
| 688 } | |
| 689 // Destructor-like method. | |
| 690 void destruct(); | |
| 691 // Accessor. | |
| 692 NotifyDoneClosure* notify_done_closure() const { return _ndc; } | |
| 693 }; | |
| 694 | |
| 695 // A WaitForBarrierGCTask is a BarrierGCTask | |
| 696 // with a method you can call to wait until | |
| 697 // the BarrierGCTask is done. | |
| 698 // This may cover many of the uses of NotifyingBarrierGCTasks. | |
| 699 class WaitForBarrierGCTask : public BarrierGCTask { | |
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700 friend class GCTaskManager; |
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701 friend class IdleGCTask; |
| 0 | 702 private: |
| 703 // Instance state. | |
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704 Monitor* _monitor; // Guard and notify changes. |
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705 volatile bool _should_wait; // true=>wait, false=>proceed. |
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706 const bool _is_c_heap_obj; // Was allocated on the heap. |
| 0 | 707 public: |
| 708 virtual char* name() { return (char *) "waitfor-barrier-task"; } | |
| 709 | |
| 710 // Factory create and destroy methods. | |
| 711 static WaitForBarrierGCTask* create(); | |
| 712 static WaitForBarrierGCTask* create_on_c_heap(); | |
| 713 static void destroy(WaitForBarrierGCTask* that); | |
| 714 // Methods. | |
| 715 void do_it(GCTaskManager* manager, uint which); | |
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716 void wait_for(bool reset); |
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717 void set_should_wait(bool value) { |
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718 _should_wait = value; |
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719 } |
| 0 | 720 protected: |
| 721 // Constructor. Clients use factory, but there might be subclasses. | |
| 722 WaitForBarrierGCTask(bool on_c_heap); | |
| 723 // Destructor-like method. | |
| 724 void destruct(); | |
| 725 // Accessors. | |
| 726 Monitor* monitor() const { | |
| 727 return _monitor; | |
| 728 } | |
| 729 bool should_wait() const { | |
| 730 return _should_wait; | |
| 731 } | |
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732 bool is_c_heap_obj() { |
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733 return _is_c_heap_obj; |
| 0 | 734 } |
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735 }; |
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736 |
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737 // Task that is used to idle a GC task when fewer than |
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738 // the maximum workers are wanted. |
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739 class IdleGCTask : public GCTask { |
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740 const bool _is_c_heap_obj; // Was allocated on the heap. |
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741 public: |
| 0 | 742 bool is_c_heap_obj() { |
| 743 return _is_c_heap_obj; | |
| 744 } | |
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745 // Factory create and destroy methods. |
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746 static IdleGCTask* create(); |
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747 static IdleGCTask* create_on_c_heap(); |
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748 static void destroy(IdleGCTask* that); |
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749 |
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750 virtual char* name() { return (char *)"idle task"; } |
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751 // Methods from GCTask. |
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752 virtual void do_it(GCTaskManager* manager, uint which); |
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753 protected: |
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754 // Constructor. |
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755 IdleGCTask(bool on_c_heap) : |
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756 GCTask(GCTask::Kind::idle_task), |
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757 _is_c_heap_obj(on_c_heap) { |
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758 // Nothing to do. |
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759 } |
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760 // Destructor-like method. |
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761 void destruct(); |
| 0 | 762 }; |
| 763 | |
| 764 class MonitorSupply : public AllStatic { | |
| 765 private: | |
| 766 // State. | |
| 767 // Control multi-threaded access. | |
| 768 static Mutex* _lock; | |
| 769 // The list of available Monitor*'s. | |
| 770 static GrowableArray<Monitor*>* _freelist; | |
| 771 public: | |
| 772 // Reserve a Monitor*. | |
| 773 static Monitor* reserve(); | |
| 774 // Release a Monitor*. | |
| 775 static void release(Monitor* instance); | |
| 776 private: | |
| 777 // Accessors. | |
| 778 static Mutex* lock() { | |
| 779 return _lock; | |
| 780 } | |
| 781 static GrowableArray<Monitor*>* freelist() { | |
| 782 return _freelist; | |
| 783 } | |
| 784 }; | |
| 1972 | 785 |
| 786 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GCTASKMANAGER_HPP |