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