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/shenandoah/shenandoahCollectorPolicy.hpp"
27 #include "gc/shenandoah/shenandoahMarkCompact.hpp"
28 #include "gc/shenandoah/shenandoahConcurrentMark.inline.hpp"
29 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
30 #include "gc/shenandoah/shenandoahPartialGC.hpp"
31 #include "gc/shenandoah/shenandoahWorkGroup.hpp"
32 #include "gc/shenandoah/vm_operations_shenandoah.hpp"
33
34 void VM_ShenandoahInitMark::doit() {
35 GCIdMark gc_id_mark(_gc_id);
36 ShenandoahHeap *sh = (ShenandoahHeap*) Universe::heap();
37 WorkGang* workers = sh->workers();
38
39 // Calculate workers for initial marking
40 uint nworkers = ShenandoahCollectorPolicy::calc_workers_for_init_marking(
41 workers->active_workers(), (uint)Threads::number_of_non_daemon_threads());
42
43 ShenandoahWorkerScope scope(workers, nworkers);
44
45 GCTraceTime(Info, gc) time("Pause Init Mark", sh->gc_timer());
46 sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::total_pause);
47 sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::init_mark);
48
49 assert(sh->is_next_bitmap_clear(), "need clear marking bitmap");
50
51 sh->start_concurrent_marking();
52 if (UseTLAB) {
53 sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::resize_tlabs);
54 sh->resize_all_tlabs();
55 sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::resize_tlabs);
56 }
57
58 sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::init_mark);
59 sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::total_pause);
60
61 }
62
63 void VM_ShenandoahFullGC::doit() {
64 GCIdMark gc_id_mark(_gc_id);
65 ShenandoahHeap *sh = ShenandoahHeap::heap();
66 sh->shenandoahPolicy()->record_gc_start();
67 ShenandoahMarkCompact::do_mark_compact(_gc_cause);
68 if (UseTLAB) {
69 sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::resize_tlabs);
70 sh->resize_all_tlabs();
71 sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::resize_tlabs);
72 }
73 sh->shenandoahPolicy()->record_gc_end();
74 }
75
76 bool VM_ShenandoahReferenceOperation::doit_prologue() {
77 Heap_lock->lock();
78 return true;
79 }
80
81 void VM_ShenandoahReferenceOperation::doit_epilogue() {
82 if (Universe::has_reference_pending_list()) {
83 Heap_lock->notify_all();
84 }
85 Heap_lock->unlock();
86 }
87
88 void VM_ShenandoahStartEvacuation::doit() {
89 GCIdMark gc_id_mark(_gc_id);
90
91 ShenandoahHeap *sh = ShenandoahHeap::heap();
92 sh->shenandoahPolicy()->record_gc_start();
93
94 // It is critical that we
95 // evacuate roots right after finishing marking, so that we don't
96 // get unmarked objects in the roots.
97 // Setup workers for final marking
98 WorkGang* workers = sh->workers();
99 uint n_workers = ShenandoahCollectorPolicy::calc_workers_for_final_marking(workers->active_workers(),
100 (uint)Threads::number_of_non_daemon_threads());
101 ShenandoahWorkerScope scope(workers, n_workers);
102
103 if (! sh->cancelled_concgc()) {
104 GCTraceTime(Info, gc) time("Pause Final Mark", sh->gc_timer(), GCCause::_no_gc, true);
105 sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::total_pause);
106 sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::final_mark);
107 sh->concurrentMark()->finish_mark_from_roots();
108 sh->stop_concurrent_marking();
109 sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::final_mark);
110 sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::total_pause);
111
112 sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::prepare_evac);
113 sh->prepare_for_concurrent_evacuation();
114 sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::prepare_evac);
115
116 sh->set_evacuation_in_progress_at_safepoint(true);
117
118 // From here on, we need to update references.
119 sh->set_need_update_refs(true);
120
121 sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::init_evac);
122 sh->evacuate_and_update_roots();
123 sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::init_evac);
124
125 } else {
126 GCTraceTime(Info, gc) time("Cancel Concurrent Mark", sh->gc_timer(), GCCause::_no_gc, true);
127 sh->concurrentMark()->cancel();
128 sh->stop_concurrent_marking();
129 }
130
131 sh->shenandoahPolicy()->record_gc_end();
132 }
133
134 void VM_ShenandoahPartialGC::doit() {
135 GCIdMark gc_id_mark(_gc_id);
136 ShenandoahHeap *sh = ShenandoahHeap::heap();
137 sh->shenandoahPolicy()->record_gc_start();
138 ShenandoahHeap::heap()->do_partial_collection();
139 sh->shenandoahPolicy()->record_gc_end();
140 }
141
142 void VM_ShenandoahVerifyHeapAfterEvacuation::doit() {
143 GCIdMark gc_id_mark(_gc_id);
144 ShenandoahHeap *sh = ShenandoahHeap::heap();
145 sh->verify_heap_after_evacuation();
146 }