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annotate src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.cpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2002, 2014, 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 #include "precompiled.hpp" |
26 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
27 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
28 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" | |
29 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" | |
10405 | 30 #include "gc_implementation/shared/gcTrace.hpp" |
1972 | 31 #include "gc_implementation/shared/mutableSpace.hpp" |
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32 #include "memory/allocation.inline.hpp" |
1972 | 33 #include "memory/memRegion.hpp" |
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34 #include "memory/padded.inline.hpp" |
1972 | 35 #include "oops/oop.inline.hpp" |
36 #include "oops/oop.psgc.inline.hpp" | |
0 | 37 |
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38 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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39 |
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40 PaddedEnd<PSPromotionManager>* PSPromotionManager::_manager_array = NULL; |
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41 OopStarTaskQueueSet* PSPromotionManager::_stack_array_depth = NULL; |
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42 PSOldGen* PSPromotionManager::_old_gen = NULL; |
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43 MutableSpace* PSPromotionManager::_young_space = NULL; |
0 | 44 |
45 void PSPromotionManager::initialize() { | |
46 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
47 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
48 | |
49 _old_gen = heap->old_gen(); | |
50 _young_space = heap->young_gen()->to_space(); | |
51 | |
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52 // To prevent false sharing, we pad the PSPromotionManagers |
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53 // and make sure that the first instance starts at a cache line. |
0 | 54 assert(_manager_array == NULL, "Attempt to initialize twice"); |
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55 _manager_array = PaddedArray<PSPromotionManager, mtGC>::create_unfreeable(ParallelGCThreads + 1); |
0 | 56 guarantee(_manager_array != NULL, "Could not initialize promotion manager"); |
57 | |
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58 _stack_array_depth = new OopStarTaskQueueSet(ParallelGCThreads); |
10405 | 59 guarantee(_stack_array_depth != NULL, "Could not initialize promotion manager"); |
0 | 60 |
61 // Create and register the PSPromotionManager(s) for the worker threads. | |
62 for(uint i=0; i<ParallelGCThreads; i++) { | |
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63 stack_array_depth()->register_queue(i, _manager_array[i].claimed_stack_depth()); |
0 | 64 } |
65 // The VMThread gets its own PSPromotionManager, which is not available | |
66 // for work stealing. | |
67 } | |
68 | |
69 PSPromotionManager* PSPromotionManager::gc_thread_promotion_manager(int index) { | |
70 assert(index >= 0 && index < (int)ParallelGCThreads, "index out of range"); | |
71 assert(_manager_array != NULL, "Sanity"); | |
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72 return &_manager_array[index]; |
0 | 73 } |
74 | |
75 PSPromotionManager* PSPromotionManager::vm_thread_promotion_manager() { | |
76 assert(_manager_array != NULL, "Sanity"); | |
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77 return &_manager_array[ParallelGCThreads]; |
0 | 78 } |
79 | |
80 void PSPromotionManager::pre_scavenge() { | |
81 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
82 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
83 | |
84 _young_space = heap->young_gen()->to_space(); | |
85 | |
86 for(uint i=0; i<ParallelGCThreads+1; i++) { | |
87 manager_array(i)->reset(); | |
88 } | |
89 } | |
90 | |
10405 | 91 bool PSPromotionManager::post_scavenge(YoungGCTracer& gc_tracer) { |
92 bool promotion_failure_occurred = false; | |
93 | |
1665 | 94 TASKQUEUE_STATS_ONLY(if (PrintGCDetails && ParallelGCVerbose) print_stats()); |
1638 | 95 for (uint i = 0; i < ParallelGCThreads + 1; i++) { |
0 | 96 PSPromotionManager* manager = manager_array(i); |
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97 assert(manager->claimed_stack_depth()->is_empty(), "should be empty"); |
10405 | 98 if (manager->_promotion_failed_info.has_failed()) { |
99 gc_tracer.report_promotion_failed(manager->_promotion_failed_info); | |
100 promotion_failure_occurred = true; | |
101 } | |
0 | 102 manager->flush_labs(); |
103 } | |
10405 | 104 return promotion_failure_occurred; |
0 | 105 } |
106 | |
1665 | 107 #if TASKQUEUE_STATS |
0 | 108 void |
1665 | 109 PSPromotionManager::print_taskqueue_stats(uint i) const { |
110 tty->print("%3u ", i); | |
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111 _claimed_stack_depth.stats.print(); |
1665 | 112 tty->cr(); |
0 | 113 } |
114 | |
115 void | |
1665 | 116 PSPromotionManager::print_local_stats(uint i) const { |
117 #define FMT " " SIZE_FORMAT_W(10) | |
118 tty->print_cr("%3u" FMT FMT FMT FMT, i, _masked_pushes, _masked_steals, | |
119 _arrays_chunked, _array_chunks_processed); | |
120 #undef FMT | |
121 } | |
122 | |
123 static const char* const pm_stats_hdr[] = { | |
124 " --------masked------- arrays array", | |
125 "thr push steal chunked chunks", | |
126 "--- ---------- ---------- ---------- ----------" | |
127 }; | |
128 | |
129 void | |
0 | 130 PSPromotionManager::print_stats() { |
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131 tty->print_cr("== GC Tasks Stats, GC %3d", |
0 | 132 Universe::heap()->total_collections()); |
133 | |
1665 | 134 tty->print("thr "); TaskQueueStats::print_header(1); tty->cr(); |
135 tty->print("--- "); TaskQueueStats::print_header(2); tty->cr(); | |
136 for (uint i = 0; i < ParallelGCThreads + 1; ++i) { | |
137 manager_array(i)->print_taskqueue_stats(i); | |
138 } | |
139 | |
140 const uint hlines = sizeof(pm_stats_hdr) / sizeof(pm_stats_hdr[0]); | |
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141 for (uint i = 0; i < hlines; ++i) tty->print_cr("%s", pm_stats_hdr[i]); |
1665 | 142 for (uint i = 0; i < ParallelGCThreads + 1; ++i) { |
143 manager_array(i)->print_local_stats(i); | |
0 | 144 } |
145 } | |
146 | |
1665 | 147 void |
148 PSPromotionManager::reset_stats() { | |
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149 claimed_stack_depth()->stats.reset(); |
1665 | 150 _masked_pushes = _masked_steals = 0; |
151 _arrays_chunked = _array_chunks_processed = 0; | |
152 } | |
153 #endif // TASKQUEUE_STATS | |
0 | 154 |
155 PSPromotionManager::PSPromotionManager() { | |
156 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
157 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
158 | |
159 // We set the old lab's start array. | |
160 _old_lab.set_start_array(old_gen()->start_array()); | |
161 | |
162 uint queue_size; | |
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163 claimed_stack_depth()->initialize(); |
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164 queue_size = claimed_stack_depth()->max_elems(); |
0 | 165 |
166 _totally_drain = (ParallelGCThreads == 1) || (GCDrainStackTargetSize == 0); | |
167 if (_totally_drain) { | |
168 _target_stack_size = 0; | |
169 } else { | |
170 // don't let the target stack size to be more than 1/4 of the entries | |
171 _target_stack_size = (uint) MIN2((uint) GCDrainStackTargetSize, | |
172 (uint) (queue_size / 4)); | |
173 } | |
174 | |
175 _array_chunk_size = ParGCArrayScanChunk; | |
176 // let's choose 1.5x the chunk size | |
177 _min_array_size_for_chunking = 3 * _array_chunk_size / 2; | |
178 | |
179 reset(); | |
180 } | |
181 | |
182 void PSPromotionManager::reset() { | |
1638 | 183 assert(stacks_empty(), "reset of non-empty stack"); |
0 | 184 |
185 // We need to get an assert in here to make sure the labs are always flushed. | |
186 | |
187 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
188 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
189 | |
190 // Do not prefill the LAB's, save heap wastage! | |
191 HeapWord* lab_base = young_space()->top(); | |
192 _young_lab.initialize(MemRegion(lab_base, (size_t)0)); | |
193 _young_gen_is_full = false; | |
194 | |
195 lab_base = old_gen()->object_space()->top(); | |
196 _old_lab.initialize(MemRegion(lab_base, (size_t)0)); | |
197 _old_gen_is_full = false; | |
198 | |
10405 | 199 _promotion_failed_info.reset(); |
200 | |
1665 | 201 TASKQUEUE_STATS_ONLY(reset_stats()); |
0 | 202 } |
203 | |
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204 |
0 | 205 void PSPromotionManager::drain_stacks_depth(bool totally_drain) { |
206 totally_drain = totally_drain || _totally_drain; | |
207 | |
208 #ifdef ASSERT | |
209 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
210 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
211 MutableSpace* to_space = heap->young_gen()->to_space(); | |
212 MutableSpace* old_space = heap->old_gen()->object_space(); | |
213 #endif /* ASSERT */ | |
214 | |
1638 | 215 OopStarTaskQueue* const tq = claimed_stack_depth(); |
0 | 216 do { |
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217 StarTask p; |
0 | 218 |
219 // Drain overflow stack first, so other threads can steal from | |
220 // claimed stack while we work. | |
1638 | 221 while (tq->pop_overflow(p)) { |
222 process_popped_location_depth(p); | |
0 | 223 } |
224 | |
225 if (totally_drain) { | |
1638 | 226 while (tq->pop_local(p)) { |
0 | 227 process_popped_location_depth(p); |
228 } | |
229 } else { | |
1638 | 230 while (tq->size() > _target_stack_size && tq->pop_local(p)) { |
0 | 231 process_popped_location_depth(p); |
232 } | |
233 } | |
1638 | 234 } while (totally_drain && !tq->taskqueue_empty() || !tq->overflow_empty()); |
0 | 235 |
1638 | 236 assert(!totally_drain || tq->taskqueue_empty(), "Sanity"); |
237 assert(totally_drain || tq->size() <= _target_stack_size, "Sanity"); | |
238 assert(tq->overflow_empty(), "Sanity"); | |
0 | 239 } |
240 | |
241 void PSPromotionManager::flush_labs() { | |
1638 | 242 assert(stacks_empty(), "Attempt to flush lab with live stack"); |
0 | 243 |
244 // If either promotion lab fills up, we can flush the | |
245 // lab but not refill it, so check first. | |
246 assert(!_young_lab.is_flushed() || _young_gen_is_full, "Sanity"); | |
247 if (!_young_lab.is_flushed()) | |
248 _young_lab.flush(); | |
249 | |
250 assert(!_old_lab.is_flushed() || _old_gen_is_full, "Sanity"); | |
251 if (!_old_lab.is_flushed()) | |
252 _old_lab.flush(); | |
253 | |
254 // Let PSScavenge know if we overflowed | |
255 if (_young_gen_is_full) { | |
256 PSScavenge::set_survivor_overflow(true); | |
257 } | |
258 } | |
259 | |
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260 template <class T> void PSPromotionManager::process_array_chunk_work( |
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261 oop obj, |
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262 int start, int end) { |
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263 assert(start <= end, "invariant"); |
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264 T* const base = (T*)objArrayOop(obj)->base(); |
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265 T* p = base + start; |
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266 T* const chunk_end = base + end; |
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267 while (p < chunk_end) { |
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268 if (PSScavenge::should_scavenge(p)) { |
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269 claim_or_forward_depth(p); |
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270 } |
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271 ++p; |
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272 } |
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273 } |
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274 |
0 | 275 void PSPromotionManager::process_array_chunk(oop old) { |
276 assert(PSChunkLargeArrays, "invariant"); | |
277 assert(old->is_objArray(), "invariant"); | |
278 assert(old->is_forwarded(), "invariant"); | |
279 | |
1665 | 280 TASKQUEUE_STATS_ONLY(++_array_chunks_processed); |
0 | 281 |
282 oop const obj = old->forwardee(); | |
283 | |
284 int start; | |
285 int const end = arrayOop(old)->length(); | |
286 if (end > (int) _min_array_size_for_chunking) { | |
287 // we'll chunk more | |
288 start = end - _array_chunk_size; | |
289 assert(start > 0, "invariant"); | |
290 arrayOop(old)->set_length(start); | |
291 push_depth(mask_chunked_array_oop(old)); | |
1665 | 292 TASKQUEUE_STATS_ONLY(++_masked_pushes); |
0 | 293 } else { |
294 // this is the final chunk for this array | |
295 start = 0; | |
296 int const actual_length = arrayOop(obj)->length(); | |
297 arrayOop(old)->set_length(actual_length); | |
298 } | |
299 | |
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300 if (UseCompressedOops) { |
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301 process_array_chunk_work<narrowOop>(obj, start, end); |
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302 } else { |
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303 process_array_chunk_work<oop>(obj, start, end); |
0 | 304 } |
305 } | |
306 | |
307 oop PSPromotionManager::oop_promotion_failed(oop obj, markOop obj_mark) { | |
308 assert(_old_gen_is_full || PromotionFailureALot, "Sanity"); | |
309 | |
310 // Attempt to CAS in the header. | |
311 // This tests if the header is still the same as when | |
312 // this started. If it is the same (i.e., no forwarding | |
313 // pointer has been installed), then this thread owns | |
314 // it. | |
315 if (obj->cas_forward_to(obj, obj_mark)) { | |
316 // We won any races, we "own" this object. | |
317 assert(obj == obj->forwardee(), "Sanity"); | |
318 | |
10405 | 319 _promotion_failed_info.register_copy_failure(obj->size()); |
320 | |
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321 obj->push_contents(this); |
0 | 322 |
323 // Save the mark if needed | |
324 PSScavenge::oop_promotion_failed(obj, obj_mark); | |
325 } else { | |
326 // We lost, someone else "owns" this object | |
327 guarantee(obj->is_forwarded(), "Object must be forwarded if the cas failed."); | |
328 | |
329 // No unallocation to worry about. | |
330 obj = obj->forwardee(); | |
331 } | |
332 | |
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333 #ifndef PRODUCT |
0 | 334 if (TraceScavenge) { |
335 gclog_or_tty->print_cr("{%s %s 0x%x (%d)}", | |
336 "promotion-failure", | |
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337 obj->klass()->internal_name(), |
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338 (void *)obj, obj->size()); |
0 | 339 |
340 } | |
341 #endif | |
342 | |
343 return obj; | |
344 } |