1 /*
2 * Copyright (c) 2014, 2021, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc/g1/g1Allocator.inline.hpp"
27 #include "gc/g1/g1CollectedHeap.inline.hpp"
28 #include "gc/g1/g1CollectionSet.hpp"
29 #include "gc/g1/g1OopClosures.inline.hpp"
30 #include "gc/g1/g1ParScanThreadState.inline.hpp"
31 #include "gc/g1/g1RootClosures.hpp"
32 #include "gc/g1/g1StringDedup.hpp"
33 #include "gc/g1/g1Trace.hpp"
34 #include "gc/shared/partialArrayTaskStepper.inline.hpp"
35 #include "gc/shared/stringdedup/stringDedup.hpp"
36 #include "gc/shared/taskqueue.inline.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "oops/access.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "runtime/atomic.hpp"
41 #include "runtime/prefetch.inline.hpp"
42 #include "utilities/globalDefinitions.hpp"
43 #include "utilities/macros.hpp"
44
45 // In fastdebug builds the code size can get out of hand, potentially
46 // tripping over compiler limits (which may be bugs, but nevertheless
47 // need to be taken into consideration). A side benefit of limiting
48 // inlining is that we get more call frames that might aid debugging.
49 // And the fastdebug compile time for this file is much reduced.
50 // Explicit NOINLINE to block ATTRIBUTE_FLATTENing.
51 #define MAYBE_INLINE_EVACUATION NOT_DEBUG(inline) DEBUG_ONLY(NOINLINE)
52
53 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h,
54 G1RedirtyCardsQueueSet* rdcqs,
55 uint worker_id,
56 uint n_workers,
57 size_t young_cset_length,
58 size_t optional_cset_length)
59 : _g1h(g1h),
60 _task_queue(g1h->task_queue(worker_id)),
61 _rdc_local_qset(rdcqs),
62 _ct(g1h->card_table()),
63 _closures(NULL),
64 _plab_allocator(NULL),
65 _age_table(false),
66 _tenuring_threshold(g1h->policy()->tenuring_threshold()),
67 _scanner(g1h, this),
68 _worker_id(worker_id),
69 _last_enqueued_card(SIZE_MAX),
70 _stack_trim_upper_threshold(GCDrainStackTargetSize * 2 + 1),
71 _stack_trim_lower_threshold(GCDrainStackTargetSize),
72 _trim_ticks(),
73 _surviving_young_words_base(NULL),
74 _surviving_young_words(NULL),
75 _surviving_words_length(young_cset_length + 1),
76 _old_gen_is_full(false),
77 _partial_objarray_chunk_size(ParGCArrayScanChunk),
78 _partial_array_stepper(n_workers),
79 _string_dedup_requests(),
80 _num_optional_regions(optional_cset_length),
81 _numa(g1h->numa()),
82 _obj_alloc_stat(NULL)
83 {
84 // We allocate number of young gen regions in the collection set plus one
85 // entries, since entry 0 keeps track of surviving bytes for non-young regions.
86 // We also add a few elements at the beginning and at the end in
87 // an attempt to eliminate cache contention
88 const size_t padding_elem_num = (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t));
89 size_t array_length = padding_elem_num + _surviving_words_length + padding_elem_num;
90
91 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length, mtGC);
92 _surviving_young_words = _surviving_young_words_base + padding_elem_num;
93 memset(_surviving_young_words, 0, _surviving_words_length * sizeof(size_t));
94
95 _plab_allocator = new G1PLABAllocator(_g1h->allocator());
96
97 // The dest for Young is used when the objects are aged enough to
98 // need to be moved to the next space.
99 _dest[G1HeapRegionAttr::Young] = G1HeapRegionAttr::Old;
100 _dest[G1HeapRegionAttr::Old] = G1HeapRegionAttr::Old;
101
102 _closures = G1EvacuationRootClosures::create_root_closures(this, _g1h);
103
104 _oops_into_optional_regions = new G1OopStarChunkedList[_num_optional_regions];
105
106 initialize_numa_stats();
107 }
108
109 size_t G1ParScanThreadState::flush(size_t* surviving_young_words) {
110 _rdc_local_qset.flush();
111 flush_numa_stats();
112 // Update allocation statistics.
113 _plab_allocator->flush_and_retire_stats();
114 _g1h->policy()->record_age_table(&_age_table);
115
116 size_t sum = 0;
117 for (uint i = 0; i < _surviving_words_length; i++) {
118 surviving_young_words[i] += _surviving_young_words[i];
119 sum += _surviving_young_words[i];
120 }
121 return sum;
122 }
123
124 G1ParScanThreadState::~G1ParScanThreadState() {
125 delete _plab_allocator;
126 delete _closures;
127 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base);
128 delete[] _oops_into_optional_regions;
129 FREE_C_HEAP_ARRAY(size_t, _obj_alloc_stat);
130 }
131
132 size_t G1ParScanThreadState::lab_waste_words() const {
133 return _plab_allocator->waste();
134 }
135
136 size_t G1ParScanThreadState::lab_undo_waste_words() const {
137 return _plab_allocator->undo_waste();
138 }
139
140 #ifdef ASSERT
141 void G1ParScanThreadState::verify_task(narrowOop* task) const {
142 assert(task != NULL, "invariant");
143 assert(UseCompressedOops, "sanity");
144 oop p = RawAccess<>::oop_load(task);
145 assert(_g1h->is_in_reserved(p),
146 "task=" PTR_FORMAT " p=" PTR_FORMAT, p2i(task), p2i(p));
147 }
148
149 void G1ParScanThreadState::verify_task(oop* task) const {
150 assert(task != NULL, "invariant");
151 oop p = RawAccess<>::oop_load(task);
152 assert(_g1h->is_in_reserved(p),
153 "task=" PTR_FORMAT " p=" PTR_FORMAT, p2i(task), p2i(p));
154 }
155
156 void G1ParScanThreadState::verify_task(PartialArrayScanTask task) const {
157 // Must be in the collection set--it's already been copied.
158 oop p = task.to_source_array();
159 assert(_g1h->is_in_cset(p), "p=" PTR_FORMAT, p2i(p));
160 }
161
162 void G1ParScanThreadState::verify_task(ScannerTask task) const {
163 if (task.is_narrow_oop_ptr()) {
164 verify_task(task.to_narrow_oop_ptr());
165 } else if (task.is_oop_ptr()) {
166 verify_task(task.to_oop_ptr());
167 } else if (task.is_partial_array_task()) {
168 verify_task(task.to_partial_array_task());
169 } else {
170 ShouldNotReachHere();
171 }
172 }
173 #endif // ASSERT
174
175 template <class T>
176 MAYBE_INLINE_EVACUATION
177 void G1ParScanThreadState::do_oop_evac(T* p) {
178 // Reference should not be NULL here as such are never pushed to the task queue.
179 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
180
181 // Although we never intentionally push references outside of the collection
182 // set, due to (benign) races in the claim mechanism during RSet scanning more
183 // than one thread might claim the same card. So the same card may be
184 // processed multiple times, and so we might get references into old gen here.
185 // So we need to redo this check.
186 const G1HeapRegionAttr region_attr = _g1h->region_attr(obj);
187 // References pushed onto the work stack should never point to a humongous region
188 // as they are not added to the collection set due to above precondition.
189 assert(!region_attr.is_humongous(),
190 "Obj " PTR_FORMAT " should not refer to humongous region %u from " PTR_FORMAT,
191 p2i(obj), _g1h->addr_to_region(cast_from_oop<HeapWord*>(obj)), p2i(p));
192
193 if (!region_attr.is_in_cset()) {
194 // In this case somebody else already did all the work.
195 return;
196 }
197
198 markWord m = obj->mark();
199 if (m.is_marked()) {
200 obj = cast_to_oop(m.decode_pointer());
201 } else {
202 obj = do_copy_to_survivor_space(region_attr, obj, m);
203 }
204 RawAccess<IS_NOT_NULL>::oop_store(p, obj);
205
206 assert(obj != NULL, "Must be");
207 if (HeapRegion::is_in_same_region(p, obj)) {
208 return;
209 }
210 HeapRegion* from = _g1h->heap_region_containing(p);
211 if (!from->is_young()) {
212 enqueue_card_if_tracked(_g1h->region_attr(obj), p, obj);
213 }
214 }
215
216 MAYBE_INLINE_EVACUATION
217 void G1ParScanThreadState::do_partial_array(PartialArrayScanTask task) {
218 oop from_obj = task.to_source_array();
219
220 assert(_g1h->is_in_reserved(from_obj), "must be in heap.");
221 assert(from_obj->is_objArray(), "must be obj array");
222 assert(from_obj->is_forwarded(), "must be forwarded");
223
224 oop to_obj = from_obj->forwardee();
225 assert(from_obj != to_obj, "should not be chunking self-forwarded objects");
226 assert(to_obj->is_objArray(), "must be obj array");
227 objArrayOop to_array = objArrayOop(to_obj);
228
229 PartialArrayTaskStepper::Step step
230 = _partial_array_stepper.next(objArrayOop(from_obj),
231 to_array,
232 _partial_objarray_chunk_size);
233 for (uint i = 0; i < step._ncreate; ++i) {
234 push_on_queue(ScannerTask(PartialArrayScanTask(from_obj)));
235 }
236
237 HeapRegion* hr = _g1h->heap_region_containing(to_array);
238 G1ScanInYoungSetter x(&_scanner, hr->is_young());
239 // Process claimed task. The length of to_array is not correct, but
240 // fortunately the iteration ignores the length field and just relies
241 // on start/end.
242 to_array->oop_iterate_range(&_scanner,
243 step._index,
244 step._index + _partial_objarray_chunk_size);
245 }
246
247 MAYBE_INLINE_EVACUATION
248 void G1ParScanThreadState::start_partial_objarray(G1HeapRegionAttr dest_attr,
249 oop from_obj,
250 oop to_obj) {
251 assert(from_obj->is_objArray(), "precondition");
252 assert(from_obj->is_forwarded(), "precondition");
253 assert(from_obj->forwardee() == to_obj, "precondition");
254 assert(from_obj != to_obj, "should not be scanning self-forwarded objects");
255 assert(to_obj->is_objArray(), "precondition");
256
257 objArrayOop to_array = objArrayOop(to_obj);
258
259 PartialArrayTaskStepper::Step step
260 = _partial_array_stepper.start(objArrayOop(from_obj),
261 to_array,
262 _partial_objarray_chunk_size);
263
264 // Push any needed partial scan tasks. Pushed before processing the
265 // intitial chunk to allow other workers to steal while we're processing.
266 for (uint i = 0; i < step._ncreate; ++i) {
267 push_on_queue(ScannerTask(PartialArrayScanTask(from_obj)));
268 }
269
270 G1ScanInYoungSetter x(&_scanner, dest_attr.is_young());
271 // Process the initial chunk. No need to process the type in the
272 // klass, as it will already be handled by processing the built-in
273 // module. The length of to_array is not correct, but fortunately
274 // the iteration ignores that length field and relies on start/end.
275 to_array->oop_iterate_range(&_scanner, 0, step._index);
276 }
277
278 MAYBE_INLINE_EVACUATION
279 void G1ParScanThreadState::dispatch_task(ScannerTask task) {
280 verify_task(task);
281 if (task.is_narrow_oop_ptr()) {
282 do_oop_evac(task.to_narrow_oop_ptr());
283 } else if (task.is_oop_ptr()) {
284 do_oop_evac(task.to_oop_ptr());
285 } else {
286 do_partial_array(task.to_partial_array_task());
287 }
288 }
289
290 // Process tasks until overflow queue is empty and local queue
291 // contains no more than threshold entries. NOINLINE to prevent
292 // inlining into steal_and_trim_queue.
293 ATTRIBUTE_FLATTEN NOINLINE
294 void G1ParScanThreadState::trim_queue_to_threshold(uint threshold) {
295 ScannerTask task;
296 do {
297 while (_task_queue->pop_overflow(task)) {
298 if (!_task_queue->try_push_to_taskqueue(task)) {
299 dispatch_task(task);
300 }
301 }
302 while (_task_queue->pop_local(task, threshold)) {
303 dispatch_task(task);
304 }
305 } while (!_task_queue->overflow_empty());
306 }
307
308 ATTRIBUTE_FLATTEN
309 void G1ParScanThreadState::steal_and_trim_queue(G1ScannerTasksQueueSet* task_queues) {
310 ScannerTask stolen_task;
311 while (task_queues->steal(_worker_id, stolen_task)) {
312 dispatch_task(stolen_task);
313 // Processing stolen task may have added tasks to our queue.
314 trim_queue();
315 }
316 }
317
318 HeapWord* G1ParScanThreadState::allocate_in_next_plab(G1HeapRegionAttr* dest,
319 size_t word_sz,
320 bool previous_plab_refill_failed,
321 uint node_index) {
322
323 assert(dest->is_in_cset_or_humongous(), "Unexpected dest: %s region attr", dest->get_type_str());
324
325 // Right now we only have two types of regions (young / old) so
326 // let's keep the logic here simple. We can generalize it when necessary.
327 if (dest->is_young()) {
328 bool plab_refill_in_old_failed = false;
329 HeapWord* const obj_ptr = _plab_allocator->allocate(G1HeapRegionAttr::Old,
330 word_sz,
331 &plab_refill_in_old_failed,
332 node_index);
333 // Make sure that we won't attempt to copy any other objects out
334 // of a survivor region (given that apparently we cannot allocate
335 // any new ones) to avoid coming into this slow path again and again.
336 // Only consider failed PLAB refill here: failed inline allocations are
337 // typically large, so not indicative of remaining space.
338 if (previous_plab_refill_failed) {
339 _tenuring_threshold = 0;
340 }
341
342 if (obj_ptr != NULL) {
343 dest->set_old();
344 } else {
345 // We just failed to allocate in old gen. The same idea as explained above
346 // for making survivor gen unavailable for allocation applies for old gen.
347 _old_gen_is_full = plab_refill_in_old_failed;
348 }
349 return obj_ptr;
350 } else {
351 _old_gen_is_full = previous_plab_refill_failed;
352 assert(dest->is_old(), "Unexpected dest region attr: %s", dest->get_type_str());
353 // no other space to try.
354 return NULL;
355 }
356 }
357
358 G1HeapRegionAttr G1ParScanThreadState::next_region_attr(G1HeapRegionAttr const region_attr, markWord const m, uint& age) {
359 if (region_attr.is_young()) {
360 age = !m.has_displaced_mark_helper() ? m.age()
361 : m.displaced_mark_helper().age();
362 if (age < _tenuring_threshold) {
363 return region_attr;
364 }
365 }
366 return dest(region_attr);
367 }
368
369 void G1ParScanThreadState::report_promotion_event(G1HeapRegionAttr const dest_attr,
370 oop const old, size_t word_sz, uint age,
371 HeapWord * const obj_ptr, uint node_index) const {
372 PLAB* alloc_buf = _plab_allocator->alloc_buffer(dest_attr, node_index);
373 if (alloc_buf->contains(obj_ptr)) {
374 _g1h->_gc_tracer_stw->report_promotion_in_new_plab_event(old->klass(), word_sz * HeapWordSize, age,
375 dest_attr.type() == G1HeapRegionAttr::Old,
376 alloc_buf->word_sz() * HeapWordSize);
377 } else {
378 _g1h->_gc_tracer_stw->report_promotion_outside_plab_event(old->klass(), word_sz * HeapWordSize, age,
379 dest_attr.type() == G1HeapRegionAttr::Old);
380 }
381 }
382
383 NOINLINE
384 HeapWord* G1ParScanThreadState::allocate_copy_slow(G1HeapRegionAttr* dest_attr,
385 oop old,
386 size_t word_sz,
387 uint age,
388 uint node_index) {
389 HeapWord* obj_ptr = NULL;
390 // Try slow-path allocation unless we're allocating old and old is already full.
391 if (!(dest_attr->is_old() && _old_gen_is_full)) {
392 bool plab_refill_failed = false;
393 obj_ptr = _plab_allocator->allocate_direct_or_new_plab(*dest_attr,
394 word_sz,
395 &plab_refill_failed,
396 node_index);
397 if (obj_ptr == NULL) {
398 obj_ptr = allocate_in_next_plab(dest_attr,
399 word_sz,
400 plab_refill_failed,
401 node_index);
402 }
403 }
404 if (obj_ptr != NULL) {
405 update_numa_stats(node_index);
406 if (_g1h->_gc_tracer_stw->should_report_promotion_events()) {
407 // The events are checked individually as part of the actual commit
408 report_promotion_event(*dest_attr, old, word_sz, age, obj_ptr, node_index);
409 }
410 }
411 return obj_ptr;
412 }
413
414 NOINLINE
415 void G1ParScanThreadState::undo_allocation(G1HeapRegionAttr dest_attr,
416 HeapWord* obj_ptr,
417 size_t word_sz,
418 uint node_index) {
419 _plab_allocator->undo_allocation(dest_attr, obj_ptr, word_sz, node_index);
420 }
421
422 // Private inline function, for direct internal use and providing the
423 // implementation of the public not-inline function.
424 MAYBE_INLINE_EVACUATION
425 oop G1ParScanThreadState::do_copy_to_survivor_space(G1HeapRegionAttr const region_attr,
426 oop const old,
427 markWord const old_mark) {
428 assert(region_attr.is_in_cset(),
429 "Unexpected region attr type: %s", region_attr.get_type_str());
430
431 // Get the klass once. We'll need it again later, and this avoids
432 // re-decoding when it's compressed.
433 Klass* klass = old->klass();
434 const size_t word_sz = old->size_given_klass(klass);
435
436 uint age = 0;
437 G1HeapRegionAttr dest_attr = next_region_attr(region_attr, old_mark, age);
438 HeapRegion* const from_region = _g1h->heap_region_containing(old);
439 uint node_index = from_region->node_index();
440
441 HeapWord* obj_ptr = _plab_allocator->plab_allocate(dest_attr, word_sz, node_index);
442
443 // PLAB allocations should succeed most of the time, so we'll
444 // normally check against NULL once and that's it.
445 if (obj_ptr == NULL) {
446 obj_ptr = allocate_copy_slow(&dest_attr, old, word_sz, age, node_index);
447 if (obj_ptr == NULL) {
448 // This will either forward-to-self, or detect that someone else has
449 // installed a forwarding pointer.
450 return handle_evacuation_failure_par(old, old_mark);
451 }
452 }
453
454 assert(obj_ptr != NULL, "when we get here, allocation should have succeeded");
455 assert(_g1h->is_in_reserved(obj_ptr), "Allocated memory should be in the heap");
456
457 #ifndef PRODUCT
458 // Should this evacuation fail?
459 if (_g1h->evacuation_should_fail()) {
460 // Doing this after all the allocation attempts also tests the
461 // undo_allocation() method too.
462 undo_allocation(dest_attr, obj_ptr, word_sz, node_index);
463 return handle_evacuation_failure_par(old, old_mark);
464 }
465 #endif // !PRODUCT
466
467 // We're going to allocate linearly, so might as well prefetch ahead.
468 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes);
469
470 const oop obj = cast_to_oop(obj_ptr);
471 const oop forward_ptr = old->forward_to_atomic(obj, old_mark, memory_order_relaxed);
472 if (forward_ptr == NULL) {
473 Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(old), obj_ptr, word_sz);
474
475 {
476 const uint young_index = from_region->young_index_in_cset();
477 assert((from_region->is_young() && young_index > 0) ||
478 (!from_region->is_young() && young_index == 0), "invariant" );
479 _surviving_young_words[young_index] += word_sz;
480 }
481
482 if (dest_attr.is_young()) {
483 if (age < markWord::max_age) {
484 age++;
485 }
486 if (old_mark.has_displaced_mark_helper()) {
487 // In this case, we have to install the old mark word containing the
488 // displacement tag, and update the age in the displaced mark word.
489 markWord new_mark = old_mark.displaced_mark_helper().set_age(age);
490 old_mark.set_displaced_mark_helper(new_mark);
491 obj->set_mark(old_mark);
492 } else {
493 obj->set_mark(old_mark.set_age(age));
494 }
495 _age_table.add(age, word_sz);
496 } else {
497 obj->set_mark(old_mark);
498 }
499
500 // Most objects are not arrays, so do one array check rather than
501 // checking for each array category for each object.
502 if (klass->is_array_klass()) {
503 if (klass->is_objArray_klass()) {
504 start_partial_objarray(dest_attr, old, obj);
505 } else {
506 // Nothing needs to be done for typeArrays. Body doesn't contain
507 // any oops to scan, and the type in the klass will already be handled
508 // by processing the built-in module.
509 assert(klass->is_typeArray_klass(), "invariant");
510 }
511 return obj;
512 }
513
514 // Check for deduplicating young Strings.
515 if (G1StringDedup::is_candidate_from_evacuation(klass,
516 region_attr,
517 dest_attr,
518 age)) {
519 // Record old; request adds a new weak reference, which reference
520 // processing expects to refer to a from-space object.
521 _string_dedup_requests.add(old);
522 }
523
524 G1ScanInYoungSetter x(&_scanner, dest_attr.is_young());
525 obj->oop_iterate_backwards(&_scanner, klass);
526 return obj;
527
528 } else {
529 _plab_allocator->undo_allocation(dest_attr, obj_ptr, word_sz, node_index);
530 return forward_ptr;
531 }
532 }
533
534 // Public not-inline entry point.
535 ATTRIBUTE_FLATTEN
536 oop G1ParScanThreadState::copy_to_survivor_space(G1HeapRegionAttr region_attr,
537 oop old,
538 markWord old_mark) {
539 return do_copy_to_survivor_space(region_attr, old, old_mark);
540 }
541
542 G1ParScanThreadState* G1ParScanThreadStateSet::state_for_worker(uint worker_id) {
543 assert(worker_id < _n_workers, "out of bounds access");
544 if (_states[worker_id] == NULL) {
545 _states[worker_id] =
546 new G1ParScanThreadState(_g1h, _rdcqs,
547 worker_id, _n_workers,
548 _young_cset_length, _optional_cset_length);
549 }
550 return _states[worker_id];
551 }
552
553 const size_t* G1ParScanThreadStateSet::surviving_young_words() const {
554 assert(_flushed, "thread local state from the per thread states should have been flushed");
555 return _surviving_young_words_total;
556 }
557
558 void G1ParScanThreadStateSet::flush() {
559 assert(!_flushed, "thread local state from the per thread states should be flushed once");
560
561 for (uint worker_id = 0; worker_id < _n_workers; ++worker_id) {
562 G1ParScanThreadState* pss = _states[worker_id];
563
564 if (pss == NULL) {
565 continue;
566 }
567
568 G1GCPhaseTimes* p = _g1h->phase_times();
569
570 // Need to get the following two before the call to G1ParThreadScanState::flush()
571 // because it resets the PLAB allocator where we get this info from.
572 size_t lab_waste_bytes = pss->lab_waste_words() * HeapWordSize;
573 size_t lab_undo_waste_bytes = pss->lab_undo_waste_words() * HeapWordSize;
574 size_t copied_bytes = pss->flush(_surviving_young_words_total) * HeapWordSize;
575
576 p->record_or_add_thread_work_item(G1GCPhaseTimes::MergePSS, worker_id, copied_bytes, G1GCPhaseTimes::MergePSSCopiedBytes);
577 p->record_or_add_thread_work_item(G1GCPhaseTimes::MergePSS, worker_id, lab_waste_bytes, G1GCPhaseTimes::MergePSSLABWasteBytes);
578 p->record_or_add_thread_work_item(G1GCPhaseTimes::MergePSS, worker_id, lab_undo_waste_bytes, G1GCPhaseTimes::MergePSSLABUndoWasteBytes);
579
580 delete pss;
581 _states[worker_id] = NULL;
582 }
583 _flushed = true;
584 }
585
586 void G1ParScanThreadStateSet::record_unused_optional_region(HeapRegion* hr) {
587 for (uint worker_index = 0; worker_index < _n_workers; ++worker_index) {
588 G1ParScanThreadState* pss = _states[worker_index];
589
590 if (pss == NULL) {
591 continue;
592 }
593
594 size_t used_memory = pss->oops_into_optional_region(hr)->used_memory();
595 _g1h->phase_times()->record_or_add_thread_work_item(G1GCPhaseTimes::OptScanHR, worker_index, used_memory, G1GCPhaseTimes::ScanHRUsedMemory);
596 }
597 }
598
599 NOINLINE
600 oop G1ParScanThreadState::handle_evacuation_failure_par(oop old, markWord m) {
601 assert(_g1h->is_in_cset(old), "Object " PTR_FORMAT " should be in the CSet", p2i(old));
602
603 oop forward_ptr = old->forward_to_atomic(old, m, memory_order_relaxed);
604 if (forward_ptr == NULL) {
605 // Forward-to-self succeeded. We are the "owner" of the object.
606 HeapRegion* r = _g1h->heap_region_containing(old);
607
608 if (_g1h->notify_region_failed_evacuation(r->hrm_index())) {
609 _g1h->hr_printer()->evac_failure(r);
610 }
611
612 _g1h->preserve_mark_during_evac_failure(_worker_id, old, m);
613
614 G1ScanInYoungSetter x(&_scanner, r->is_young());
615 old->oop_iterate_backwards(&_scanner);
616
617 return old;
618 } else {
619 // Forward-to-self failed. Either someone else managed to allocate
620 // space for this object (old != forward_ptr) or they beat us in
621 // self-forwarding it (old == forward_ptr).
622 assert(old == forward_ptr || !_g1h->is_in_cset(forward_ptr),
623 "Object " PTR_FORMAT " forwarded to: " PTR_FORMAT " "
624 "should not be in the CSet",
625 p2i(old), p2i(forward_ptr));
626 return forward_ptr;
627 }
628 }
629
630 void G1ParScanThreadState::initialize_numa_stats() {
631 if (_numa->is_enabled()) {
632 LogTarget(Info, gc, heap, numa) lt;
633
634 if (lt.is_enabled()) {
635 uint num_nodes = _numa->num_active_nodes();
636 // Record only if there are multiple active nodes.
637 _obj_alloc_stat = NEW_C_HEAP_ARRAY(size_t, num_nodes, mtGC);
638 memset(_obj_alloc_stat, 0, sizeof(size_t) * num_nodes);
639 }
640 }
641 }
642
643 void G1ParScanThreadState::flush_numa_stats() {
644 if (_obj_alloc_stat != NULL) {
645 uint node_index = _numa->index_of_current_thread();
646 _numa->copy_statistics(G1NUMAStats::LocalObjProcessAtCopyToSurv, node_index, _obj_alloc_stat);
647 }
648 }
649
650 void G1ParScanThreadState::update_numa_stats(uint node_index) {
651 if (_obj_alloc_stat != NULL) {
652 _obj_alloc_stat[node_index]++;
653 }
654 }
655
656 G1ParScanThreadStateSet::G1ParScanThreadStateSet(G1CollectedHeap* g1h,
657 G1RedirtyCardsQueueSet* rdcqs,
658 uint n_workers,
659 size_t young_cset_length,
660 size_t optional_cset_length) :
661 _g1h(g1h),
662 _rdcqs(rdcqs),
663 _states(NEW_C_HEAP_ARRAY(G1ParScanThreadState*, n_workers, mtGC)),
664 _surviving_young_words_total(NEW_C_HEAP_ARRAY(size_t, young_cset_length + 1, mtGC)),
665 _young_cset_length(young_cset_length),
666 _optional_cset_length(optional_cset_length),
667 _n_workers(n_workers),
668 _flushed(false) {
669 for (uint i = 0; i < n_workers; ++i) {
670 _states[i] = NULL;
671 }
672 memset(_surviving_young_words_total, 0, (young_cset_length + 1) * sizeof(size_t));
673 }
674
675 G1ParScanThreadStateSet::~G1ParScanThreadStateSet() {
676 assert(_flushed, "thread local state from the per thread states should have been flushed");
677 FREE_C_HEAP_ARRAY(G1ParScanThreadState*, _states);
678 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_total);
679 }