1 /*
2 * Copyright (c) 2017, 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 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHUTILS_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHUTILS_HPP
27
28 #include "gc/shared/gcCause.hpp"
29 #include "gc/shared/gcTraceTime.inline.hpp"
30 #include "gc/shared/gcVMOperations.hpp"
31 #include "gc/shared/isGCActiveMark.hpp"
32 #include "gc/shared/suspendibleThreadSet.hpp"
33 #include "gc/shared/workerThread.hpp"
34 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
35 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
36 #include "jfr/jfrEvents.hpp"
37 #include "memory/allocation.hpp"
38 #include "runtime/safepoint.hpp"
39 #include "runtime/vmThread.hpp"
40 #include "runtime/vmOperations.hpp"
41 #include "services/memoryService.hpp"
42
43 class GCTimer;
44
45 class ShenandoahGCSession : public StackObj {
46 private:
47 ShenandoahHeap* const _heap;
48 GCTimer* const _timer;
49 GCTracer* const _tracer;
50
51 TraceMemoryManagerStats _trace_cycle;
52 public:
53 ShenandoahGCSession(GCCause::Cause cause);
54 ~ShenandoahGCSession();
55 };
56
57 /*
58 * ShenandoahGCPhaseTiming tracks Shenandoah specific timing information
59 * of a GC phase
60 */
61 class ShenandoahTimingsTracker : public StackObj {
62 private:
63 static ShenandoahPhaseTimings::Phase _current_phase;
64
65 ShenandoahPhaseTimings* const _timings;
66 const ShenandoahPhaseTimings::Phase _phase;
67 ShenandoahPhaseTimings::Phase _parent_phase;
68 double _start;
69
70 public:
71 ShenandoahTimingsTracker(ShenandoahPhaseTimings::Phase phase);
72 ~ShenandoahTimingsTracker();
73
74 static ShenandoahPhaseTimings::Phase current_phase() { return _current_phase; }
75
76 static bool is_current_phase_valid();
77 };
78
79 /*
80 * ShenandoahPausePhase tracks a STW pause and emits Shenandoah timing and
81 * a corresponding JFR event
82 */
83 class ShenandoahPausePhase : public ShenandoahTimingsTracker {
84 private:
85 GCTraceTimeWrapper<LogLevel::Info, LOG_TAGS(gc)> _tracer;
86 ConcurrentGCTimer* const _timer;
87
88 public:
89 ShenandoahPausePhase(const char* title, ShenandoahPhaseTimings::Phase phase, bool log_heap_usage = false);
90 ~ShenandoahPausePhase();
91 };
92
93 /*
94 * ShenandoahConcurrentPhase tracks a concurrent GC phase and emits Shenandoah timing and
95 * a corresponding JFR event
96 */
97 class ShenandoahConcurrentPhase : public ShenandoahTimingsTracker {
98 private:
99 GCTraceTimeWrapper<LogLevel::Info, LOG_TAGS(gc)> _tracer;
100 ConcurrentGCTimer* const _timer;
101
102 public:
103 ShenandoahConcurrentPhase(const char* title, ShenandoahPhaseTimings::Phase phase, bool log_heap_usage = false);
104 ~ShenandoahConcurrentPhase();
105 };
106
107 /*
108 * ShenandoahGCPhase tracks Shenandoah specific timing information
109 * and emits a corresponding JFR event of a GC phase
110 */
111 class ShenandoahGCPhase : public ShenandoahTimingsTracker {
112 private:
113 ConcurrentGCTimer* const _timer;
114
115 public:
116 ShenandoahGCPhase(ShenandoahPhaseTimings::Phase phase);
117 ~ShenandoahGCPhase();
118 };
119
120 class ShenandoahGCWorkerPhase : public StackObj {
121 private:
122 ShenandoahPhaseTimings* const _timings;
123 const ShenandoahPhaseTimings::Phase _phase;
124 public:
125 ShenandoahGCWorkerPhase(ShenandoahPhaseTimings::Phase phase);
126 ~ShenandoahGCWorkerPhase();
127 };
128
129 // Aggregates all the things that should happen before/after the pause.
130 class ShenandoahGCPauseMark : public StackObj {
131 private:
132 ShenandoahHeap* const _heap;
133 const GCIdMark _gc_id_mark;
134 const SvcGCMarker _svc_gc_mark;
135 const IsSTWGCActiveMark _is_gc_active_mark;
136 TraceMemoryManagerStats _trace_pause;
137
138 public:
139 ShenandoahGCPauseMark(uint gc_id, const char* notification_action, SvcGCMarker::reason_type type);
140 };
141
142 class ShenandoahSafepoint : public AllStatic {
143 public:
144 // Check if Shenandoah GC safepoint is in progress. This is nominally
145 // equivalent to calling SafepointSynchronize::is_at_safepoint(), but
146 // it also checks the Shenandoah specifics, when it can.
147 static inline bool is_at_shenandoah_safepoint() {
148 if (!SafepointSynchronize::is_at_safepoint()) return false;
149
150 Thread* const thr = Thread::current();
151 // Shenandoah GC specific safepoints are scheduled by control thread.
152 // So if we are enter here from control thread, then we are definitely not
153 // at Shenandoah safepoint, but at something else.
154 if (thr == ShenandoahHeap::heap()->control_thread()) return false;
155
156 // This is not VM thread, cannot see what VM thread is doing,
157 // so pretend this is a proper Shenandoah safepoint
158 if (!thr->is_VM_thread()) return true;
159
160 // Otherwise check we are at proper operation type
161 VM_Operation* vm_op = VMThread::vm_operation();
162 if (vm_op == nullptr) return false;
163
164 VM_Operation::VMOp_Type type = vm_op->type();
165 return type == VM_Operation::VMOp_ShenandoahInitMark ||
166 type == VM_Operation::VMOp_ShenandoahFinalMarkStartEvac ||
167 type == VM_Operation::VMOp_ShenandoahInitUpdateRefs ||
168 type == VM_Operation::VMOp_ShenandoahFinalUpdateRefs ||
169 type == VM_Operation::VMOp_ShenandoahFinalRoots ||
170 type == VM_Operation::VMOp_ShenandoahFullGC ||
171 type == VM_Operation::VMOp_ShenandoahDegeneratedGC;
172 }
173 };
174
175 class ShenandoahWorkerSession : public StackObj {
176 protected:
177 ShenandoahWorkerSession(uint worker_id);
178 public:
179 static inline uint worker_id() {
180 return WorkerThread::worker_id();
181 }
182 };
183
184 class ShenandoahConcurrentWorkerSession : public ShenandoahWorkerSession {
185 private:
186 EventGCPhaseConcurrent _event;
187
188 public:
189 ShenandoahConcurrentWorkerSession(uint worker_id) : ShenandoahWorkerSession(worker_id) { }
190 ~ShenandoahConcurrentWorkerSession();
191 };
192
193 class ShenandoahParallelWorkerSession : public ShenandoahWorkerSession {
194 private:
195 EventGCPhaseParallel _event;
196
197 public:
198 ShenandoahParallelWorkerSession(uint worker_id) : ShenandoahWorkerSession(worker_id) { }
199 ~ShenandoahParallelWorkerSession();
200 };
201
202 class ShenandoahSuspendibleThreadSetJoiner {
203 private:
204 SuspendibleThreadSetJoiner _joiner;
205 public:
206 ShenandoahSuspendibleThreadSetJoiner(bool active = true) : _joiner(active) {
207 assert(!ShenandoahThreadLocalData::is_evac_allowed(Thread::current()), "STS should be joined before evac scope");
208 }
209 ~ShenandoahSuspendibleThreadSetJoiner() {
210 assert(!ShenandoahThreadLocalData::is_evac_allowed(Thread::current()), "STS should be left after evac scope");
211 }
212 };
213
214 class ShenandoahSuspendibleThreadSetLeaver {
215 private:
216 SuspendibleThreadSetLeaver _leaver;
217 public:
218 ShenandoahSuspendibleThreadSetLeaver(bool active = true) : _leaver(active) {
219 assert(!ShenandoahThreadLocalData::is_evac_allowed(Thread::current()), "STS should be left after evac scope");
220 }
221 ~ShenandoahSuspendibleThreadSetLeaver() {
222 assert(!ShenandoahThreadLocalData::is_evac_allowed(Thread::current()), "STS should be joined before evac scope");
223 }
224 };
225
226 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHUTILS_HPP