1 /* 2 * Copyright (c) 2018, 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(ShenandoahSATBBufferSize, SATB_Q_FL_lock) 33 {} 34 35 void ShenandoahSATBMarkQueueSet::initialize(ShenandoahHeap* const heap, 36 Monitor* cbl_mon, 37 int process_completed_threshold, 38 uint buffer_enqueue_threshold_percentage, 39 Mutex* lock) { 40 SATBMarkQueueSet::initialize(cbl_mon, 41 &_satb_mark_queue_buffer_allocator, 42 process_completed_threshold, 43 buffer_enqueue_threshold_percentage, 44 lock); 45 _heap = heap; 46 } 47 48 SATBMarkQueue& ShenandoahSATBMarkQueueSet::satb_queue_for_thread(JavaThread* const t) const { 49 return ShenandoahThreadLocalData::satb_mark_queue(t); 50 } 51 52 static inline bool discard_entry(const void* entry, ShenandoahHeap* heap) { 53 return !heap->requires_marking(entry); 54 } 55 56 class ShenandoahSATBMarkQueueFilterFn { 57 ShenandoahHeap* _heap; 58 59 public: 60 ShenandoahSATBMarkQueueFilterFn(ShenandoahHeap* heap) : _heap(heap) {} 61 62 // Return true if entry should be filtered out (removed), false if 63 // it should be retained. 64 bool operator()(const void* entry) const { 65 return discard_entry(entry, _heap); 66 } 67 }; 68 69 void ShenandoahSATBMarkQueueSet::filter(SATBMarkQueue* queue) { 70 assert(_heap != NULL, "SATB queue set not initialized"); 71 apply_filter(ShenandoahSATBMarkQueueFilterFn(_heap), queue); 72 } 73 74 bool ShenandoahSATBMarkQueue::should_enqueue_buffer() { 75 bool should_enqueue = SATBMarkQueue::should_enqueue_buffer(); 76 size_t cap = capacity(); 77 Thread* t = Thread::current(); 78 if (ShenandoahThreadLocalData::is_force_satb_flush(t)) { 79 if (!should_enqueue && cap != index()) { 80 // Non-empty buffer is compacted, and we decided not to enqueue it. 81 // We still want to know about leftover work in that buffer eventually. 82 // This avoid dealing with these leftovers during the final-mark, after 83 // the buffers are drained completely. See JDK-8205353 for more discussion. 84 should_enqueue = true; 85 } 86 ShenandoahThreadLocalData::set_force_satb_flush(t, false); 87 } 88 return should_enqueue; 89 }