1 /* 2 * Copyright (c) 2018, 2019, Red Hat, Inc. All rights reserved. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #include "precompiled.hpp" 25 26 #include "gc/shenandoah/shenandoahHeap.inline.hpp" 27 #include "gc/shenandoah/shenandoahSATBMarkQueueSet.hpp" 28 #include "gc/shenandoah/shenandoahThreadLocalData.hpp" 29 30 ShenandoahSATBMarkQueueSet::ShenandoahSATBMarkQueueSet() : 31 _heap(NULL), 32 _satb_mark_queue_buffer_allocator("SATB Buffer Allocator", ShenandoahSATBBufferSize) 33 {} 34 35 void ShenandoahSATBMarkQueueSet::initialize(ShenandoahHeap* const heap, 36 int process_completed_threshold, 37 uint buffer_enqueue_threshold_percentage) { 38 SATBMarkQueueSet::initialize(&_satb_mark_queue_buffer_allocator, 39 process_completed_threshold, 40 buffer_enqueue_threshold_percentage); 41 _heap = heap; 42 } 43 44 SATBMarkQueue& ShenandoahSATBMarkQueueSet::satb_queue_for_thread(Thread* const t) const { 45 return ShenandoahThreadLocalData::satb_mark_queue(t); 46 } 47 48 template <bool RESOLVE> 49 class ShenandoahSATBMarkQueueFilterFn { 50 ShenandoahHeap* const _heap; 51 52 public: 53 ShenandoahSATBMarkQueueFilterFn(ShenandoahHeap* heap) : _heap(heap) {} 54 55 // Return true if entry should be filtered out (removed), false if 56 // it should be retained. 57 bool operator()(const void* entry) const { 58 return !_heap->requires_marking<RESOLVE>(entry); 59 } 60 }; 61 62 void ShenandoahSATBMarkQueueSet::filter(SATBMarkQueue* queue) { 63 assert(_heap != NULL, "SATB queue set not initialized"); 64 if (_heap->has_forwarded_objects()) { 65 apply_filter(ShenandoahSATBMarkQueueFilterFn<true>(_heap), queue); 66 } else { 67 apply_filter(ShenandoahSATBMarkQueueFilterFn<false>(_heap), queue); 68 } 69 } 70 71 void ShenandoahSATBMarkQueue::handle_completed_buffer() { 72 SATBMarkQueue::handle_completed_buffer(); 73 if (!is_empty()) { 74 Thread* t = Thread::current(); 75 if (ShenandoahThreadLocalData::is_force_satb_flush(t)) { 76 // Non-empty buffer is compacted, and we decided not to enqueue it. 77 // We still want to know about leftover work in that buffer eventually. 78 // This avoid dealing with these leftovers during the final-mark, after 79 // the buffers are drained completely. See JDK-8205353 for more discussion. 80 ShenandoahThreadLocalData::set_force_satb_flush(t, false); 81 enqueue_completed_buffer(); 82 } 83 } 84 }