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/dirtyCardQueue.hpp"
27 #include "gc/g1/g1BlockOffsetTable.inline.hpp"
28 #include "gc/g1/g1CardTable.inline.hpp"
29 #include "gc/g1/g1CollectedHeap.inline.hpp"
30 #include "gc/g1/g1ConcurrentRefine.hpp"
31 #include "gc/g1/g1FromCardCache.hpp"
32 #include "gc/g1/g1GCPhaseTimes.hpp"
33 #include "gc/g1/g1HotCardCache.hpp"
34 #include "gc/g1/g1OopClosures.inline.hpp"
35 #include "gc/g1/g1RemSet.hpp"
36 #include "gc/g1/heapRegion.inline.hpp"
37 #include "gc/g1/heapRegionManager.inline.hpp"
38 #include "gc/g1/heapRegionRemSet.hpp"
39 #include "gc/shared/gcTraceTime.inline.hpp"
40 #include "gc/shared/suspendibleThreadSet.hpp"
41 #include "memory/iterator.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/access.inline.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "utilities/align.hpp"
46 #include "utilities/globalDefinitions.hpp"
471 // Apply the closure to all remaining log entries.
472 _g1->iterate_dirty_card_closure(&refine_card_cl, worker_i);
473
474 G1GCPhaseTimes* p = _g1p->phase_times();
475 p->record_thread_work_item(G1GCPhaseTimes::UpdateRS, worker_i, refine_card_cl.cards_scanned(), G1GCPhaseTimes::UpdateRSScannedCards);
476 p->record_thread_work_item(G1GCPhaseTimes::UpdateRS, worker_i, refine_card_cl.cards_skipped(), G1GCPhaseTimes::UpdateRSSkippedCards);
477 }
478
479 void G1RemSet::cleanupHRRS() {
480 HeapRegionRemSet::cleanup();
481 }
482
483 void G1RemSet::oops_into_collection_set_do(G1ParScanThreadState* pss,
484 CodeBlobClosure* heap_region_codeblobs,
485 uint worker_i) {
486 update_rem_set(pss, worker_i);
487 scan_rem_set(pss, heap_region_codeblobs, worker_i);;
488 }
489
490 void G1RemSet::prepare_for_oops_into_collection_set_do() {
491 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
492 dcqs.concatenate_logs();
493
494 _scan_state->reset();
495 }
496
497 void G1RemSet::cleanup_after_oops_into_collection_set_do() {
498 G1GCPhaseTimes* phase_times = _g1->g1_policy()->phase_times();
499
500 // Set all cards back to clean.
501 double start = os::elapsedTime();
502 _scan_state->clear_card_table(_g1->workers());
503 phase_times->record_clear_ct_time((os::elapsedTime() - start) * 1000.0);
504 }
505
506 inline void check_card_ptr(jbyte* card_ptr, G1CardTable* ct) {
507 #ifdef ASSERT
508 G1CollectedHeap* g1 = G1CollectedHeap::heap();
509 assert(g1->is_in_exact(ct->addr_for(card_ptr)),
510 "Card at " PTR_FORMAT " index " SIZE_FORMAT " representing heap at " PTR_FORMAT " (%u) must be in committed heap",
511 p2i(card_ptr),
624 assert(!dirty_region.is_empty(), "sanity");
625
626 G1ConcurrentRefineOopClosure conc_refine_cl(_g1, worker_i);
627
628 bool card_processed =
629 r->oops_on_card_seq_iterate_careful<false>(dirty_region, &conc_refine_cl);
630
631 // If unable to process the card then we encountered an unparsable
632 // part of the heap (e.g. a partially allocated object) while
633 // processing a stale card. Despite the card being stale, redirty
634 // and re-enqueue, because we've already cleaned the card. Without
635 // this we could incorrectly discard a non-stale card.
636 if (!card_processed) {
637 // The card might have gotten re-dirtied and re-enqueued while we
638 // worked. (In fact, it's pretty likely.)
639 if (*card_ptr != G1CardTable::dirty_card_val()) {
640 *card_ptr = G1CardTable::dirty_card_val();
641 MutexLockerEx x(Shared_DirtyCardQ_lock,
642 Mutex::_no_safepoint_check_flag);
643 DirtyCardQueue* sdcq =
644 JavaThread::dirty_card_queue_set().shared_dirty_card_queue();
645 sdcq->enqueue(card_ptr);
646 }
647 } else {
648 _num_conc_refined_cards++; // Unsynchronized update, only used for logging.
649 }
650 }
651
652 bool G1RemSet::refine_card_during_gc(jbyte* card_ptr,
653 G1ScanObjsDuringUpdateRSClosure* update_rs_cl) {
654 assert(_g1->is_gc_active(), "Only call during GC");
655
656 check_card_ptr(card_ptr, _ct);
657
658 // If the card is no longer dirty, nothing to do. This covers cards that were already
659 // scanned as parts of the remembered sets.
660 if (*card_ptr != G1CardTable::dirty_card_val()) {
661 return false;
662 }
663
664 // We claim lazily (so races are possible but they're benign), which reduces the
|
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/dirtyCardQueue.hpp"
27 #include "gc/g1/g1BarrierSet.hpp"
28 #include "gc/g1/g1BlockOffsetTable.inline.hpp"
29 #include "gc/g1/g1CardTable.inline.hpp"
30 #include "gc/g1/g1CollectedHeap.inline.hpp"
31 #include "gc/g1/g1ConcurrentRefine.hpp"
32 #include "gc/g1/g1FromCardCache.hpp"
33 #include "gc/g1/g1GCPhaseTimes.hpp"
34 #include "gc/g1/g1HotCardCache.hpp"
35 #include "gc/g1/g1OopClosures.inline.hpp"
36 #include "gc/g1/g1RemSet.hpp"
37 #include "gc/g1/heapRegion.inline.hpp"
38 #include "gc/g1/heapRegionManager.inline.hpp"
39 #include "gc/g1/heapRegionRemSet.hpp"
40 #include "gc/shared/gcTraceTime.inline.hpp"
41 #include "gc/shared/suspendibleThreadSet.hpp"
42 #include "memory/iterator.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/access.inline.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "utilities/align.hpp"
47 #include "utilities/globalDefinitions.hpp"
472 // Apply the closure to all remaining log entries.
473 _g1->iterate_dirty_card_closure(&refine_card_cl, worker_i);
474
475 G1GCPhaseTimes* p = _g1p->phase_times();
476 p->record_thread_work_item(G1GCPhaseTimes::UpdateRS, worker_i, refine_card_cl.cards_scanned(), G1GCPhaseTimes::UpdateRSScannedCards);
477 p->record_thread_work_item(G1GCPhaseTimes::UpdateRS, worker_i, refine_card_cl.cards_skipped(), G1GCPhaseTimes::UpdateRSSkippedCards);
478 }
479
480 void G1RemSet::cleanupHRRS() {
481 HeapRegionRemSet::cleanup();
482 }
483
484 void G1RemSet::oops_into_collection_set_do(G1ParScanThreadState* pss,
485 CodeBlobClosure* heap_region_codeblobs,
486 uint worker_i) {
487 update_rem_set(pss, worker_i);
488 scan_rem_set(pss, heap_region_codeblobs, worker_i);;
489 }
490
491 void G1RemSet::prepare_for_oops_into_collection_set_do() {
492 DirtyCardQueueSet& dcqs = G1BarrierSet::dirty_card_queue_set();
493 dcqs.concatenate_logs();
494
495 _scan_state->reset();
496 }
497
498 void G1RemSet::cleanup_after_oops_into_collection_set_do() {
499 G1GCPhaseTimes* phase_times = _g1->g1_policy()->phase_times();
500
501 // Set all cards back to clean.
502 double start = os::elapsedTime();
503 _scan_state->clear_card_table(_g1->workers());
504 phase_times->record_clear_ct_time((os::elapsedTime() - start) * 1000.0);
505 }
506
507 inline void check_card_ptr(jbyte* card_ptr, G1CardTable* ct) {
508 #ifdef ASSERT
509 G1CollectedHeap* g1 = G1CollectedHeap::heap();
510 assert(g1->is_in_exact(ct->addr_for(card_ptr)),
511 "Card at " PTR_FORMAT " index " SIZE_FORMAT " representing heap at " PTR_FORMAT " (%u) must be in committed heap",
512 p2i(card_ptr),
625 assert(!dirty_region.is_empty(), "sanity");
626
627 G1ConcurrentRefineOopClosure conc_refine_cl(_g1, worker_i);
628
629 bool card_processed =
630 r->oops_on_card_seq_iterate_careful<false>(dirty_region, &conc_refine_cl);
631
632 // If unable to process the card then we encountered an unparsable
633 // part of the heap (e.g. a partially allocated object) while
634 // processing a stale card. Despite the card being stale, redirty
635 // and re-enqueue, because we've already cleaned the card. Without
636 // this we could incorrectly discard a non-stale card.
637 if (!card_processed) {
638 // The card might have gotten re-dirtied and re-enqueued while we
639 // worked. (In fact, it's pretty likely.)
640 if (*card_ptr != G1CardTable::dirty_card_val()) {
641 *card_ptr = G1CardTable::dirty_card_val();
642 MutexLockerEx x(Shared_DirtyCardQ_lock,
643 Mutex::_no_safepoint_check_flag);
644 DirtyCardQueue* sdcq =
645 G1BarrierSet::dirty_card_queue_set().shared_dirty_card_queue();
646 sdcq->enqueue(card_ptr);
647 }
648 } else {
649 _num_conc_refined_cards++; // Unsynchronized update, only used for logging.
650 }
651 }
652
653 bool G1RemSet::refine_card_during_gc(jbyte* card_ptr,
654 G1ScanObjsDuringUpdateRSClosure* update_rs_cl) {
655 assert(_g1->is_gc_active(), "Only call during GC");
656
657 check_card_ptr(card_ptr, _ct);
658
659 // If the card is no longer dirty, nothing to do. This covers cards that were already
660 // scanned as parts of the remembered sets.
661 if (*card_ptr != G1CardTable::dirty_card_val()) {
662 return false;
663 }
664
665 // We claim lazily (so races are possible but they're benign), which reduces the
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