1 /*
2 * Copyright (c) 2013, 2021, 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
25 #include "precompiled.hpp"
26
27 #include "gc/shenandoah/shenandoahConcurrentGC.hpp"
28 #include "gc/shenandoah/shenandoahDegeneratedGC.hpp"
29 #include "gc/shenandoah/shenandoahFullGC.hpp"
30 #include "gc/shenandoah/shenandoahGeneration.hpp"
31 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
32 #include "gc/shenandoah/shenandoahMark.inline.hpp"
33 #include "gc/shenandoah/shenandoahOopClosures.inline.hpp"
34 #include "gc/shenandoah/shenandoahUtils.hpp"
35 #include "gc/shenandoah/shenandoahVMOperations.hpp"
36 #include "interpreter/oopMapCache.hpp"
37 #include "logging/log.hpp"
38 #include "memory/universe.hpp"
39
40 bool VM_ShenandoahOperation::doit_prologue() {
41 log_active_generation("Prologue");
42 assert(!ShenandoahHeap::heap()->has_gc_state_changed(), "GC State can only be changed on a safepoint.");
43 return true;
44 }
45
46 void VM_ShenandoahOperation::doit_epilogue() {
47 log_active_generation("Epilogue");
48 assert(!ShenandoahHeap::heap()->has_gc_state_changed(), "GC State was not synchronized to java threads.");
49 // GC thread root traversal likely used OopMapCache a lot, which
50 // might have created lots of old entries. Trigger the cleanup now.
51 OopMapCache::try_trigger_cleanup();
52 }
53
54 void VM_ShenandoahOperation::log_active_generation(const char* prefix) {
55 ShenandoahGeneration* agen = ShenandoahHeap::heap()->active_generation();
56 ShenandoahGeneration* ggen = ShenandoahHeap::heap()->gc_generation();
57 log_debug(gc, heap)("%s: active_generation is %s, gc_generation is %s", prefix,
58 agen == nullptr ? "nullptr" : shenandoah_generation_name(agen->type()),
59 ggen == nullptr ? "nullptr" : shenandoah_generation_name(ggen->type()));
60 }
61
62 void VM_ShenandoahOperation::set_active_generation() {
63 if (evaluate_at_safepoint()) {
64 assert(SafepointSynchronize::is_at_safepoint(), "Error??");
65 ShenandoahHeap::heap()->set_active_generation();
66 }
67 }
68
69 bool VM_ShenandoahReferenceOperation::doit_prologue() {
70 VM_ShenandoahOperation::doit_prologue();
71 Heap_lock->lock();
72 return true;
73 }
74
75 void VM_ShenandoahReferenceOperation::doit_epilogue() {
76 VM_ShenandoahOperation::doit_epilogue();
77 if (Universe::has_reference_pending_list()) {
78 Heap_lock->notify_all();
79 }
80 Heap_lock->unlock();
81 }
82
83 void VM_ShenandoahInitMark::doit() {
84 ShenandoahGCPauseMark mark(_gc_id, "Init Mark", SvcGCMarker::CONCURRENT);
85 set_active_generation();
86 _gc->entry_init_mark();
87 ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
88 }
89
90 void VM_ShenandoahFinalMarkStartEvac::doit() {
91 ShenandoahGCPauseMark mark(_gc_id, "Final Mark", SvcGCMarker::CONCURRENT);
92 set_active_generation();
93 _gc->entry_final_mark();
94 ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
95 }
96
97 void VM_ShenandoahFullGC::doit() {
98 ShenandoahGCPauseMark mark(_gc_id, "Full GC", SvcGCMarker::FULL);
99 set_active_generation();
100 _full_gc->entry_full(_gc_cause);
101 ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
102 }
103
104 void VM_ShenandoahDegeneratedGC::doit() {
105 ShenandoahGCPauseMark mark(_gc_id, "Degenerated GC", SvcGCMarker::CONCURRENT);
106 set_active_generation();
107 _gc->entry_degenerated();
108 ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
109 }
110
111 void VM_ShenandoahInitUpdateRefs::doit() {
112 ShenandoahGCPauseMark mark(_gc_id, "Init Update Refs", SvcGCMarker::CONCURRENT);
113 set_active_generation();
114 _gc->entry_init_updaterefs();
115 ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
116 }
117
118 void VM_ShenandoahFinalUpdateRefs::doit() {
119 ShenandoahGCPauseMark mark(_gc_id, "Final Update Refs", SvcGCMarker::CONCURRENT);
120 set_active_generation();
121 _gc->entry_final_updaterefs();
122 ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
123 }
124
125 void VM_ShenandoahFinalRoots::doit() {
126 ShenandoahGCPauseMark mark(_gc_id, "Final Roots", SvcGCMarker::CONCURRENT);
127 set_active_generation();
128 _gc->entry_final_roots();
129 ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
130 }