Wed, 31 Jul 2019 14:28:51 -0400
8048556: Unnecessary GCLocker-initiated young GCs
Summary: Fixed recognition of unnecessary GCLocker collections.
Reviewed-by: pliden, tschatzl
Contributed-by: johnc@azul.com
1 /*
2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. 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 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_GCTRACE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_GCTRACE_HPP
28 #include "gc_interface/gcCause.hpp"
29 #include "gc_interface/gcName.hpp"
30 #include "gc_implementation/shared/gcId.hpp"
31 #include "gc_implementation/shared/gcWhen.hpp"
32 #include "gc_implementation/shared/copyFailedInfo.hpp"
33 #include "memory/allocation.hpp"
34 #include "memory/metaspace.hpp"
35 #include "memory/referenceType.hpp"
36 #if INCLUDE_ALL_GCS
37 #include "gc_implementation/g1/g1YCTypes.hpp"
38 #endif
39 #include "utilities/macros.hpp"
40 #include "utilities/ticks.hpp"
43 class EvacuationInfo;
44 class GCHeapSummary;
45 class MetaspaceChunkFreeListSummary;
46 class MetaspaceSummary;
47 class PSHeapSummary;
48 class ReferenceProcessorStats;
49 class TimePartitions;
50 class BoolObjectClosure;
52 class SharedGCInfo VALUE_OBJ_CLASS_SPEC {
53 private:
54 GCId _gc_id;
55 GCName _name;
56 GCCause::Cause _cause;
57 Ticks _start_timestamp;
58 Ticks _end_timestamp;
59 Tickspan _sum_of_pauses;
60 Tickspan _longest_pause;
62 public:
63 SharedGCInfo(GCName name) :
64 _gc_id(GCId::undefined()),
65 _name(name),
66 _cause(GCCause::_last_gc_cause),
67 _start_timestamp(),
68 _end_timestamp(),
69 _sum_of_pauses(),
70 _longest_pause() {
71 }
73 void set_gc_id(GCId gc_id) { _gc_id = gc_id; }
74 const GCId& gc_id() const { return _gc_id; }
76 void set_start_timestamp(const Ticks& timestamp) { _start_timestamp = timestamp; }
77 const Ticks start_timestamp() const { return _start_timestamp; }
79 void set_end_timestamp(const Ticks& timestamp) { _end_timestamp = timestamp; }
80 const Ticks end_timestamp() const { return _end_timestamp; }
82 void set_name(GCName name) { _name = name; }
83 GCName name() const { return _name; }
85 void set_cause(GCCause::Cause cause) { _cause = cause; }
86 GCCause::Cause cause() const { return _cause; }
88 void set_sum_of_pauses(const Tickspan& duration) { _sum_of_pauses = duration; }
89 const Tickspan sum_of_pauses() const { return _sum_of_pauses; }
91 void set_longest_pause(const Tickspan& duration) { _longest_pause = duration; }
92 const Tickspan longest_pause() const { return _longest_pause; }
93 };
95 class ParallelOldGCInfo VALUE_OBJ_CLASS_SPEC {
96 void* _dense_prefix;
97 public:
98 ParallelOldGCInfo() : _dense_prefix(NULL) {}
99 void report_dense_prefix(void* addr) {
100 _dense_prefix = addr;
101 }
102 void* dense_prefix() const { return _dense_prefix; }
103 };
105 #if INCLUDE_ALL_GCS
107 class G1YoungGCInfo VALUE_OBJ_CLASS_SPEC {
108 G1YCType _type;
109 public:
110 G1YoungGCInfo() : _type(G1YCTypeEndSentinel) {}
111 void set_type(G1YCType type) {
112 _type = type;
113 }
114 G1YCType type() const { return _type; }
115 };
117 #endif // INCLUDE_ALL_GCS
119 class GCTracer : public ResourceObj {
120 protected:
121 SharedGCInfo _shared_gc_info;
123 public:
124 void report_gc_start(GCCause::Cause cause, const Ticks& timestamp);
125 void report_gc_end(const Ticks& timestamp, TimePartitions* time_partitions);
126 void report_gc_heap_summary(GCWhen::Type when, const GCHeapSummary& heap_summary) const;
127 void report_metaspace_summary(GCWhen::Type when, const MetaspaceSummary& metaspace_summary) const;
128 void report_gc_reference_stats(const ReferenceProcessorStats& rp) const;
129 void report_object_count_after_gc(BoolObjectClosure* object_filter) NOT_SERVICES_RETURN;
130 bool has_reported_gc_start() const;
131 const GCId& gc_id() { return _shared_gc_info.gc_id(); }
133 protected:
134 GCTracer(GCName name) : _shared_gc_info(name) {}
135 void report_gc_start_impl(GCCause::Cause cause, const Ticks& timestamp);
136 virtual void report_gc_end_impl(const Ticks& timestamp, TimePartitions* time_partitions);
138 private:
139 void send_garbage_collection_event() const;
140 void send_gc_heap_summary_event(GCWhen::Type when, const GCHeapSummary& heap_summary) const;
141 void send_meta_space_summary_event(GCWhen::Type when, const MetaspaceSummary& meta_space_summary) const;
142 void send_metaspace_chunk_free_list_summary(GCWhen::Type when, Metaspace::MetadataType mdtype, const MetaspaceChunkFreeListSummary& summary) const;
143 void send_reference_stats_event(ReferenceType type, size_t count) const;
144 void send_phase_events(TimePartitions* time_partitions) const;
145 };
147 class YoungGCTracer : public GCTracer {
148 static const uint UNSET_TENURING_THRESHOLD = (uint) -1;
150 uint _tenuring_threshold;
152 protected:
153 YoungGCTracer(GCName name) : GCTracer(name), _tenuring_threshold(UNSET_TENURING_THRESHOLD) {}
154 virtual void report_gc_end_impl(const Ticks& timestamp, TimePartitions* time_partitions);
156 public:
157 void report_promotion_failed(const PromotionFailedInfo& pf_info);
158 void report_tenuring_threshold(const uint tenuring_threshold);
160 private:
161 void send_young_gc_event() const;
162 void send_promotion_failed_event(const PromotionFailedInfo& pf_info) const;
163 };
165 class OldGCTracer : public GCTracer {
166 protected:
167 OldGCTracer(GCName name) : GCTracer(name) {}
168 virtual void report_gc_end_impl(const Ticks& timestamp, TimePartitions* time_partitions);
170 public:
171 void report_concurrent_mode_failure();
173 private:
174 void send_old_gc_event() const;
175 void send_concurrent_mode_failure_event();
176 };
178 class ParallelOldTracer : public OldGCTracer {
179 ParallelOldGCInfo _parallel_old_gc_info;
181 public:
182 ParallelOldTracer() : OldGCTracer(ParallelOld) {}
183 void report_dense_prefix(void* dense_prefix);
185 protected:
186 void report_gc_end_impl(const Ticks& timestamp, TimePartitions* time_partitions);
188 private:
189 void send_parallel_old_event() const;
190 };
192 class SerialOldTracer : public OldGCTracer {
193 public:
194 SerialOldTracer() : OldGCTracer(SerialOld) {}
195 };
197 class ParallelScavengeTracer : public YoungGCTracer {
198 public:
199 ParallelScavengeTracer() : YoungGCTracer(ParallelScavenge) {}
200 };
202 class DefNewTracer : public YoungGCTracer {
203 public:
204 DefNewTracer() : YoungGCTracer(DefNew) {}
205 };
207 class ParNewTracer : public YoungGCTracer {
208 public:
209 ParNewTracer() : YoungGCTracer(ParNew) {}
210 };
212 #if INCLUDE_ALL_GCS
213 class G1NewTracer : public YoungGCTracer {
214 G1YoungGCInfo _g1_young_gc_info;
216 public:
217 G1NewTracer() : YoungGCTracer(G1New) {}
219 void report_yc_type(G1YCType type);
220 void report_gc_end_impl(const Ticks& timestamp, TimePartitions* time_partitions);
221 void report_evacuation_info(EvacuationInfo* info);
222 void report_evacuation_failed(EvacuationFailedInfo& ef_info);
224 private:
225 void send_g1_young_gc_event();
226 void send_evacuation_info_event(EvacuationInfo* info);
227 void send_evacuation_failed_event(const EvacuationFailedInfo& ef_info) const;
228 };
229 #endif
231 class CMSTracer : public OldGCTracer {
232 public:
233 CMSTracer() : OldGCTracer(ConcurrentMarkSweep) {}
234 };
236 class G1OldTracer : public OldGCTracer {
237 public:
238 G1OldTracer() : OldGCTracer(G1Old) {}
239 };
241 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GCTRACE_HPP