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
30ShenandoahSATBMarkQueueSet::ShenandoahSATBMarkQueueSet() :
31 _heap(NULL),
32 _satb_mark_queue_buffer_allocator("SATB Buffer Allocator", ShenandoahSATBBufferSize)
33{}
34
35void ShenandoahSATBMarkQueueSet::initialize(ShenandoahHeap* const heap,
36 Monitor* cbl_mon,
37 int process_completed_threshold,
38 uint buffer_enqueue_threshold_percentage) {
39 SATBMarkQueueSet::initialize(cbl_mon,
40 &_satb_mark_queue_buffer_allocator,
41 process_completed_threshold,
42 buffer_enqueue_threshold_percentage);
43 _heap = heap;
44}
45
46SATBMarkQueue& ShenandoahSATBMarkQueueSet::satb_queue_for_thread(Thread* const t) const {
47 return ShenandoahThreadLocalData::satb_mark_queue(t);
48}
49
50template <bool RESOLVE>
51class ShenandoahSATBMarkQueueFilterFn {
52 ShenandoahHeap* const _heap;
53
54public:
55 ShenandoahSATBMarkQueueFilterFn(ShenandoahHeap* heap) : _heap(heap) {}
56
57 // Return true if entry should be filtered out (removed), false if
58 // it should be retained.
59 bool operator()(const void* entry) const {
60 return !_heap->requires_marking<RESOLVE>(entry);
61 }
62};
63
64void ShenandoahSATBMarkQueueSet::filter(SATBMarkQueue* queue) {
65 assert(_heap != NULL, "SATB queue set not initialized");
66 if (_heap->has_forwarded_objects()) {
67 apply_filter(ShenandoahSATBMarkQueueFilterFn<true>(_heap), queue);
68 } else {
69 apply_filter(ShenandoahSATBMarkQueueFilterFn<false>(_heap), queue);
70 }
71}
72
73void ShenandoahSATBMarkQueue::handle_completed_buffer() {
74 SATBMarkQueue::handle_completed_buffer();
75 if (!is_empty()) {
76 Thread* t = Thread::current();
77 if (ShenandoahThreadLocalData::is_force_satb_flush(t)) {
78 // Non-empty buffer is compacted, and we decided not to enqueue it.
79 // We still want to know about leftover work in that buffer eventually.
80 // This avoid dealing with these leftovers during the final-mark, after
81 // the buffers are drained completely. See JDK-8205353 for more discussion.
82 ShenandoahThreadLocalData::set_force_satb_flush(t, false);
83 enqueue_completed_buffer();
84 }
85 }
86}
87