1 /*
2 * Copyright (c) 2020, Red Hat, Inc. 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 #include "precompiled.hpp"
25
26 #include "gc/shenandoah/shenandoahFreeSet.hpp"
27 #include "gc/shenandoah/shenandoahHeap.hpp"
28 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
29 #include "gc/shenandoah/shenandoahOldGeneration.hpp"
30 #include "gc/shenandoah/shenandoahUtils.hpp"
31 #include "gc/shenandoah/shenandoahVerifier.hpp"
32 #include "gc/shenandoah/shenandoahYoungGeneration.hpp"
33 #include "gc/shenandoah/heuristics/shenandoahHeuristics.hpp"
34
35 ShenandoahYoungGeneration::ShenandoahYoungGeneration(uint max_queues, size_t max_capacity, size_t soft_max_capacity) :
36 ShenandoahGeneration(YOUNG, max_queues, max_capacity, soft_max_capacity),
37 _old_gen_task_queues(nullptr) {
38 }
39
40 const char* ShenandoahYoungGeneration::name() const {
41 return "YOUNG";
42 }
43
44 void ShenandoahYoungGeneration::set_concurrent_mark_in_progress(bool in_progress) {
45 ShenandoahHeap* heap = ShenandoahHeap::heap();
46 heap->set_concurrent_young_mark_in_progress(in_progress);
47 if (is_bootstrap_cycle() && in_progress && !heap->is_prepare_for_old_mark_in_progress()) {
48 // This is not a bug. When the bootstrapping marking phase is complete,
49 // the old generation marking is still in progress, unless it's not.
50 // In the case that old-gen preparation for mixed evacuation has been
51 // preempted, we do not want to set concurrent old mark to be in progress.
52 heap->set_concurrent_old_mark_in_progress(in_progress);
53 }
54 }
55
56 bool ShenandoahYoungGeneration::contains(ShenandoahHeapRegion* region) const {
57 // TODO: why not test for equals YOUNG_GENERATION? As written, returns true for regions that are FREE
58 return region->affiliation() != OLD_GENERATION;
59 }
60
61 void ShenandoahYoungGeneration::parallel_heap_region_iterate(ShenandoahHeapRegionClosure* cl) {
62 // Just iterate over the young generation here.
63 ShenandoahGenerationRegionClosure<YOUNG> young_regions(cl);
64 ShenandoahHeap::heap()->parallel_heap_region_iterate(&young_regions);
65 }
66
67 void ShenandoahYoungGeneration::heap_region_iterate(ShenandoahHeapRegionClosure* cl) {
68 ShenandoahGenerationRegionClosure<YOUNG> young_regions(cl);
69 ShenandoahHeap::heap()->heap_region_iterate(&young_regions);
70 }
71
72 bool ShenandoahYoungGeneration::is_concurrent_mark_in_progress() {
73 return ShenandoahHeap::heap()->is_concurrent_young_mark_in_progress();
74 }
75
76 void ShenandoahYoungGeneration::reserve_task_queues(uint workers) {
77 ShenandoahGeneration::reserve_task_queues(workers);
78 if (is_bootstrap_cycle()) {
79 _old_gen_task_queues->reserve(workers);
80 }
81 }
82
83 bool ShenandoahYoungGeneration::contains(oop obj) const {
84 return ShenandoahHeap::heap()->is_in_young(obj);
85 }
86
87 ShenandoahHeuristics* ShenandoahYoungGeneration::initialize_heuristics(ShenandoahMode* gc_mode) {
88 _heuristics = gc_mode->initialize_heuristics(this);
89 _heuristics->set_guaranteed_gc_interval(ShenandoahGuaranteedYoungGCInterval);
90 confirm_heuristics_mode();
91 return _heuristics;
92 }
93
94 void ShenandoahYoungGeneration::add_collection_time(double time_seconds) {
95 if (is_bootstrap_cycle()) {
96 // This is a bootstrap cycle, so attribute time to old gc
97 ShenandoahHeap::heap()->old_generation()->add_collection_time(time_seconds);
98 } else {
99 ShenandoahGeneration::add_collection_time(time_seconds);
100 }
101 }