1 /*
2 * Copyright (c) 2013, 2015, Red Hat, Inc. and/or its affiliates.
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 #include "gc/shared/gcTraceTime.inline.hpp"
26 #include "gc/shared/vmGCOperations.hpp"
27 #include "gc/shenandoah/shenandoahConcurrentMark.inline.hpp"
28 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
29 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
30 #include "gc/shenandoah/shenandoahMarkCompact.hpp"
31 #include "gc/shenandoah/shenandoahPartialGC.hpp"
32 #include "gc/shenandoah/shenandoahUtils.hpp"
33 #include "gc/shenandoah/shenandoahVerifier.hpp"
34 #include "gc/shenandoah/shenandoahWorkGroup.hpp"
35 #include "gc/shenandoah/shenandoahWorkerPolicy.hpp"
36 #include "gc/shenandoah/vm_operations_shenandoah.hpp"
37
38 void VM_ShenandoahInitMark::doit() {
39 ShenandoahGCPauseMark mark(_gc_id, ShenandoahPhaseTimings::init_mark, SvcGCMarker::OTHER);
40
41 ShenandoahHeap* sh = ShenandoahHeap::heap();
42
43 GCTraceTime(Info, gc) time("Pause Init Mark", sh->gc_timer());
44 WorkGang* workers = sh->workers();
45
46 // Calculate workers for initial marking
47 uint nworkers = ShenandoahWorkerPolicy::calc_workers_for_init_marking();
48
49 ShenandoahWorkerScope scope(workers, nworkers);
50
51 assert(sh->is_next_bitmap_clear(), "need clear marking bitmap");
52
53 sh->start_concurrent_marking();
54 }
55
56 void VM_ShenandoahFullGC::doit() {
57 ShenandoahGCPauseMark mark(_gc_id, ShenandoahPhaseTimings::full_gc, SvcGCMarker::FULL);
58 ShenandoahMarkCompact::do_mark_compact(_gc_cause);
59 }
60
61 bool VM_ShenandoahReferenceOperation::doit_prologue() {
62 Heap_lock->lock();
63 return true;
64 }
65
66 void VM_ShenandoahReferenceOperation::doit_epilogue() {
67 if (Universe::has_reference_pending_list()) {
68 Heap_lock->notify_all();
69 }
70 Heap_lock->unlock();
71 }
72
73 void VM_ShenandoahFinalMarkStartEvac::doit() {
74 ShenandoahGCPauseMark mark(_gc_id, ShenandoahPhaseTimings::final_mark, SvcGCMarker::OTHER);
75
76 ShenandoahHeap *sh = ShenandoahHeap::heap();
77
78 // It is critical that we
79 // evacuate roots right after finishing marking, so that we don't
80 // get unmarked objects in the roots.
81 // Setup workers for final marking
82 WorkGang* workers = sh->workers();
83 uint n_workers = ShenandoahWorkerPolicy::calc_workers_for_final_marking();
84 ShenandoahWorkerScope scope(workers, n_workers);
85
86 if (! sh->cancelled_concgc()) {
87 GCTraceTime(Info, gc) time("Pause Final Mark", sh->gc_timer(), GCCause::_no_gc, true);
88 sh->concurrentMark()->finish_mark_from_roots();
89 sh->stop_concurrent_marking();
90
91 {
92 ShenandoahGCPhase prepare_evac(ShenandoahPhaseTimings::prepare_evac);
93 sh->prepare_for_concurrent_evacuation();
94 }
95
96 // If collection set has candidates, start evacuation.
97 // Otherwise, bypass the rest of the cycle.
98 if (!sh->collection_set()->is_empty()) {
99 sh->set_evacuation_in_progress_at_safepoint(true);
100 // From here on, we need to update references.
101 sh->set_need_update_refs(true);
102
103 ShenandoahGCPhase init_evac(ShenandoahPhaseTimings::init_evac);
104 sh->evacuate_and_update_roots();
105 }
106 } else {
107 GCTraceTime(Info, gc) time("Cancel Concurrent Mark", sh->gc_timer(), GCCause::_no_gc, true);
108 sh->concurrentMark()->cancel();
109 sh->stop_concurrent_marking();
110 }
111 }
112
113 void VM_ShenandoahPartialGC::doit() {
114 ShenandoahGCPauseMark mark(_gc_id, ShenandoahPhaseTimings::partial_gc, SvcGCMarker::MINOR);
115 ShenandoahHeap::heap()->do_partial_collection();
116 }
117
118 void VM_ShenandoahInitUpdateRefs::doit() {
119 ShenandoahGCPauseMark mark(_gc_id, ShenandoahPhaseTimings::init_update_refs, SvcGCMarker::OTHER);
120
121 ShenandoahHeap *sh = ShenandoahHeap::heap();
122 GCTraceTime(Info, gc) time("Pause Init Update Refs", sh->gc_timer(), GCCause::_no_gc);
123
124 sh->prepare_update_refs();
125 }
126
127 void VM_ShenandoahFinalUpdateRefs::doit() {
128 ShenandoahGCPauseMark mark(_gc_id, ShenandoahPhaseTimings::final_update_refs, SvcGCMarker::OTHER);
129
130 ShenandoahHeap *sh = ShenandoahHeap::heap();
131 GCTraceTime(Info, gc) time("Pause Final Update Refs", sh->gc_timer(), GCCause::_no_gc, true);
132 WorkGang* workers = sh->workers();
133 uint n_workers = ShenandoahWorkerPolicy::calc_workers_for_final_update_ref();
134 ShenandoahWorkerScope scope(workers, n_workers);
135
136 sh->finish_update_refs();
137 }
138
139 void VM_ShenandoahVerifyHeapAfterEvacuation::doit() {
140 ShenandoahGCPauseMark mark(_gc_id, ShenandoahPhaseTimings::pause_other, SvcGCMarker::OTHER);
141 ShenandoahHeap::heap()->verifier()->verify_after_evacuation();
142 }