1 /*
2 * Copyright (c) 2013, 2016, 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 */
24
25 #include "precompiled.hpp"
26 #include "gc/g1/concurrentG1Refine.hpp"
27 #include "gc/g1/g1CollectedHeap.inline.hpp"
28 #include "gc/g1/g1GCPhaseTimes.hpp"
29 #include "gc/g1/g1StringDedup.hpp"
30 #include "gc/g1/workerDataArray.inline.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "logging/log.hpp"
33 #include "runtime/timer.hpp"
34 #include "runtime/os.hpp"
35
36 static const char* Indents[5] = {"", " ", " ", " ", " "};
37
38 G1GCPhaseTimes::G1GCPhaseTimes(uint max_gc_threads) :
39 _max_gc_threads(max_gc_threads)
40 {
41 assert(max_gc_threads > 0, "Must have some GC threads");
42
43 _gc_par_phases[GCWorkerStart] = new WorkerDataArray<double>(max_gc_threads, "GC Worker Start (ms):");
44 _gc_par_phases[ExtRootScan] = new WorkerDataArray<double>(max_gc_threads, "Ext Root Scanning (ms):");
45
46 // Root scanning phases
47 _gc_par_phases[ThreadRoots] = new WorkerDataArray<double>(max_gc_threads, "Thread Roots (ms):");
48 _gc_par_phases[StringTableRoots] = new WorkerDataArray<double>(max_gc_threads, "StringTable Roots (ms):");
49 _gc_par_phases[UniverseRoots] = new WorkerDataArray<double>(max_gc_threads, "Universe Roots (ms):");
50 _gc_par_phases[JNIRoots] = new WorkerDataArray<double>(max_gc_threads, "JNI Handles Roots (ms):");
51 _gc_par_phases[ObjectSynchronizerRoots] = new WorkerDataArray<double>(max_gc_threads, "ObjectSynchronizer Roots (ms):");
52 _gc_par_phases[FlatProfilerRoots] = new WorkerDataArray<double>(max_gc_threads, "FlatProfiler Roots (ms):");
53 _gc_par_phases[ManagementRoots] = new WorkerDataArray<double>(max_gc_threads, "Management Roots (ms):");
54 _gc_par_phases[SystemDictionaryRoots] = new WorkerDataArray<double>(max_gc_threads, "SystemDictionary Roots (ms):");
55 _gc_par_phases[CLDGRoots] = new WorkerDataArray<double>(max_gc_threads, "CLDG Roots (ms):");
56 _gc_par_phases[JVMTIRoots] = new WorkerDataArray<double>(max_gc_threads, "JVMTI Roots (ms):");
57 _gc_par_phases[CMRefRoots] = new WorkerDataArray<double>(max_gc_threads, "CM RefProcessor Roots (ms):");
58 _gc_par_phases[WaitForStrongCLD] = new WorkerDataArray<double>(max_gc_threads, "Wait For Strong CLD (ms):");
59 _gc_par_phases[WeakCLDRoots] = new WorkerDataArray<double>(max_gc_threads, "Weak CLD Roots (ms):");
60 _gc_par_phases[SATBFiltering] = new WorkerDataArray<double>(max_gc_threads, "SATB Filtering (ms):");
61
62 _gc_par_phases[UpdateRS] = new WorkerDataArray<double>(max_gc_threads, "Update RS (ms):");
63 if (ConcurrentG1Refine::hot_card_cache_enabled()) {
64 _gc_par_phases[ScanHCC] = new WorkerDataArray<double>(max_gc_threads, "Scan HCC (ms):");
65 } else {
66 _gc_par_phases[ScanHCC] = NULL;
67 }
68 _gc_par_phases[ScanRS] = new WorkerDataArray<double>(max_gc_threads, "Scan RS (ms):");
69 _gc_par_phases[CodeRoots] = new WorkerDataArray<double>(max_gc_threads, "Code Root Scanning (ms):");
70 _gc_par_phases[ObjCopy] = new WorkerDataArray<double>(max_gc_threads, "Object Copy (ms):");
71 _gc_par_phases[Termination] = new WorkerDataArray<double>(max_gc_threads, "Termination (ms):");
72 _gc_par_phases[GCWorkerTotal] = new WorkerDataArray<double>(max_gc_threads, "GC Worker Total (ms):");
73 _gc_par_phases[GCWorkerEnd] = new WorkerDataArray<double>(max_gc_threads, "GC Worker End (ms):");
74 _gc_par_phases[Other] = new WorkerDataArray<double>(max_gc_threads, "GC Worker Other (ms):");
75
76 _update_rs_processed_buffers = new WorkerDataArray<size_t>(max_gc_threads, "Processed Buffers:");
77 _gc_par_phases[UpdateRS]->link_thread_work_items(_update_rs_processed_buffers);
78
79 _termination_attempts = new WorkerDataArray<size_t>(max_gc_threads, "Termination Attempts:");
80 _gc_par_phases[Termination]->link_thread_work_items(_termination_attempts);
81
82 if (UseStringDeduplication) {
83 _gc_par_phases[StringDedupQueueFixup] = new WorkerDataArray<double>(max_gc_threads, "Queue Fixup (ms):");
84 _gc_par_phases[StringDedupTableFixup] = new WorkerDataArray<double>(max_gc_threads, "Table Fixup (ms):");
85 } else {
86 _gc_par_phases[StringDedupQueueFixup] = NULL;
87 _gc_par_phases[StringDedupTableFixup] = NULL;
88 }
89
90 _gc_par_phases[RedirtyCards] = new WorkerDataArray<double>(max_gc_threads, "Parallel Redirty (ms):");
91 _redirtied_cards = new WorkerDataArray<size_t>(max_gc_threads, "Redirtied Cards:");
92 _gc_par_phases[RedirtyCards]->link_thread_work_items(_redirtied_cards);
93
94 _gc_par_phases[PreserveCMReferents] = new WorkerDataArray<double>(max_gc_threads, "Parallel Preserve CM Refs (ms):");
95 }
96
97 void G1GCPhaseTimes::note_gc_start() {
98 _gc_start_counter = os::elapsed_counter();
99 _cur_expand_heap_time_ms = 0.0;
100 _external_accounted_time_ms = 0.0;
101
102 for (int i = 0; i < GCParPhasesSentinel; i++) {
103 if (_gc_par_phases[i] != NULL) {
104 _gc_par_phases[i]->reset();
105 }
106 }
107 }
108
109 #define ASSERT_PHASE_UNINITILAIZED(phase) \
110 assert(_gc_par_phases[phase]->get(i) == uninitialized, "Phase " #phase " reported for thread that was not started");
111
112 #define ADD_WORKER_KNOWN_TIME(phase) \
113 do { \
114 double value = _gc_par_phases[phase]->get(i); \
115 if (value != uninitialized) { \
116 worker_known_time += value; \
117 } \
118 } while(false)
119
120 void G1GCPhaseTimes::note_gc_end() {
121 _gc_pause_time_ms = TimeHelper::counter_to_millis(os::elapsed_counter() - _gc_start_counter);
122
123 double uninitialized = _gc_par_phases[GCWorkerStart]->uninitialized();
124
125 for (uint i = 0; i < _max_gc_threads; i++) {
126 double worker_start = _gc_par_phases[GCWorkerStart]->get(i);
127 if (worker_start == uninitialized) {
128 // Make sure all slots are uninitialized since this thread did not seem to have been started
129 ASSERT_PHASE_UNINITILAIZED(GCWorkerEnd);
130 ASSERT_PHASE_UNINITILAIZED(ExtRootScan);
131 ASSERT_PHASE_UNINITILAIZED(SATBFiltering);
132 ASSERT_PHASE_UNINITILAIZED(UpdateRS);
133 ASSERT_PHASE_UNINITILAIZED(ScanRS);
134 ASSERT_PHASE_UNINITILAIZED(CodeRoots);
135 ASSERT_PHASE_UNINITILAIZED(ObjCopy);
136 ASSERT_PHASE_UNINITILAIZED(Termination);
137 } else {
138 assert(_gc_par_phases[GCWorkerEnd]->get(i) != _gc_par_phases[GCWorkerEnd]->uninitialized(), "Worker started but not ended.");
139 double worker_time = _gc_par_phases[GCWorkerEnd]->get(i) - _gc_par_phases[GCWorkerStart]->get(i);
140 record_time_secs(GCWorkerTotal, i , worker_time);
141
142 double worker_known_time = 0.0;
143 ADD_WORKER_KNOWN_TIME(ExtRootScan);
144 ADD_WORKER_KNOWN_TIME(SATBFiltering);
145 ADD_WORKER_KNOWN_TIME(UpdateRS);
146 ADD_WORKER_KNOWN_TIME(ScanRS);
147 ADD_WORKER_KNOWN_TIME(CodeRoots);
148 ADD_WORKER_KNOWN_TIME(ObjCopy);
149 ADD_WORKER_KNOWN_TIME(Termination);
150
151 record_time_secs(Other, i, worker_time - worker_known_time);
152 }
153 }
154 }
155
156 #undef ADD_WORKER_KNOWN_TIME
157 #undef ASSERT_PHASE_UNINITILAIZED
158
159 // record the time a phase took in seconds
160 void G1GCPhaseTimes::record_time_secs(GCParPhases phase, uint worker_i, double secs) {
161 _gc_par_phases[phase]->set(worker_i, secs);
162 }
163
164 // add a number of seconds to a phase
165 void G1GCPhaseTimes::add_time_secs(GCParPhases phase, uint worker_i, double secs) {
166 _gc_par_phases[phase]->add(worker_i, secs);
167 }
168
169 void G1GCPhaseTimes::record_thread_work_item(GCParPhases phase, uint worker_i, size_t count) {
170 _gc_par_phases[phase]->set_thread_work_item(worker_i, count);
171 }
172
173 // return the average time for a phase in milliseconds
174 double G1GCPhaseTimes::average_time_ms(GCParPhases phase) {
175 return _gc_par_phases[phase]->average() * 1000.0;
176 }
177
178 size_t G1GCPhaseTimes::sum_thread_work_items(GCParPhases phase) {
179 assert(_gc_par_phases[phase]->thread_work_items() != NULL, "No sub count");
180 return _gc_par_phases[phase]->thread_work_items()->sum();
181 }
182
183 template <class T>
184 void G1GCPhaseTimes::details(T* phase, const char* indent) {
185 LogHandle(gc, phases, task) log;
186 if (log.is_level(LogLevel::Trace)) {
187 outputStream* trace_out = log.trace_stream();
188 trace_out->print("%s", indent);
189 phase->print_details_on(trace_out);
190 }
191 }
192
193 void G1GCPhaseTimes::log_phase(WorkerDataArray<double>* phase, uint indent, outputStream* out, bool print_sum) {
194 out->print("%s", Indents[indent]);
195 phase->print_summary_on(out, print_sum);
196 details(phase, Indents[indent]);
197
198 WorkerDataArray<size_t>* work_items = phase->thread_work_items();
199 if (work_items != NULL) {
200 out->print("%s", Indents[indent + 1]);
201 work_items->print_summary_on(out, true);
202 details(work_items, Indents[indent + 1]);
203 }
204 }
205
206 void G1GCPhaseTimes::debug_phase(WorkerDataArray<double>* phase) {
207 LogHandle(gc, phases) log;
208 if (log.is_level(LogLevel::Debug)) {
209 ResourceMark rm;
210 log_phase(phase, 2, log.debug_stream(), true);
211 }
212 }
213
214 void G1GCPhaseTimes::trace_phase(WorkerDataArray<double>* phase, bool print_sum) {
215 LogHandle(gc, phases) log;
216 if (log.is_level(LogLevel::Trace)) {
217 ResourceMark rm;
218 log_phase(phase, 3, log.trace_stream(), print_sum);
219 }
220 }
221
222 #define PHASE_DOUBLE_FORMAT "%s%s: %.1lfms"
223 #define PHASE_SIZE_FORMAT "%s%s: " SIZE_FORMAT
224
225 #define info_line(str, value) \
226 log_info(gc, phases)(PHASE_DOUBLE_FORMAT, Indents[1], str, value);
227
228 #define debug_line(str, value) \
229 log_debug(gc, phases)(PHASE_DOUBLE_FORMAT, Indents[2], str, value);
230
231 #define trace_line(str, value) \
232 log_trace(gc, phases)(PHASE_DOUBLE_FORMAT, Indents[3], str, value);
233
234 #define trace_line_sz(str, value) \
235 log_trace(gc, phases)(PHASE_SIZE_FORMAT, Indents[3], str, value);
236
237 #define trace_line_ms(str, value) \
238 log_trace(gc, phases)(PHASE_SIZE_FORMAT, Indents[3], str, value);
239
240 #define info_line_and_account(str, value) \
241 info_line(str, value); \
242 accounted_time_ms += value;
243
244 void G1GCPhaseTimes::print() {
245 note_gc_end();
246
247 double accounted_time_ms = _external_accounted_time_ms;
248 if (_root_region_scan_wait_time_ms > 0.0) {
249 info_line_and_account("Root Region Scan Waiting", _root_region_scan_wait_time_ms);
250 }
251
252 info_line_and_account("Evacuate Collection Set", _cur_collection_par_time_ms);
253 trace_phase(_gc_par_phases[GCWorkerStart], false);
254 debug_phase(_gc_par_phases[ExtRootScan]);
255 for (int i = ThreadRoots; i <= SATBFiltering; i++) {
256 trace_phase(_gc_par_phases[i]);
257 }
258 debug_phase(_gc_par_phases[UpdateRS]);
259 if (ConcurrentG1Refine::hot_card_cache_enabled()) {
260 trace_phase(_gc_par_phases[ScanHCC]);
261 }
262 debug_phase(_gc_par_phases[ScanRS]);
263 debug_phase(_gc_par_phases[CodeRoots]);
264 debug_phase(_gc_par_phases[ObjCopy]);
265 debug_phase(_gc_par_phases[Termination]);
266 debug_phase(_gc_par_phases[Other]);
267 debug_phase(_gc_par_phases[GCWorkerTotal]);
268 trace_phase(_gc_par_phases[GCWorkerEnd], false);
269
270 info_line_and_account("Code Roots", _cur_collection_code_root_fixup_time_ms + _cur_strong_code_root_purge_time_ms);
271 debug_line("Code Roots Fixup", _cur_collection_code_root_fixup_time_ms);
272 debug_line("Code Roots Purge", _cur_strong_code_root_purge_time_ms);
273
274 if (G1StringDedup::is_enabled()) {
275 info_line_and_account("String Dedup Fixup", _cur_string_dedup_fixup_time_ms);
276 debug_phase(_gc_par_phases[StringDedupQueueFixup]);
277 debug_phase(_gc_par_phases[StringDedupTableFixup]);
278 }
279 info_line_and_account("Clear Card Table", _cur_clear_ct_time_ms);
280 info_line_and_account("Expand Heap After Collection", _cur_expand_heap_time_ms);
281
282 double free_cset_time = _recorded_young_free_cset_time_ms + _recorded_non_young_free_cset_time_ms;
283 info_line_and_account("Free Collection Set", free_cset_time);
284 debug_line("Young Free Collection Set", _recorded_young_free_cset_time_ms);
285 debug_line("Non-Young Free Collection Set", _recorded_non_young_free_cset_time_ms);
286 info_line_and_account("Merge Per-Thread State", _recorded_merge_pss_time_ms);
287
288 info_line("Other", _gc_pause_time_ms - accounted_time_ms);
289 if (_cur_verify_before_time_ms > 0.0) {
290 debug_line("Verify Before", _cur_verify_before_time_ms);
291 }
292 if (G1CollectedHeap::heap()->evacuation_failed()) {
293 double evac_fail_handling = _cur_evac_fail_recalc_used + _cur_evac_fail_remove_self_forwards +
294 _cur_evac_fail_restore_remsets;
295 debug_line("Evacuation Failure", evac_fail_handling);
296 trace_line("Recalculate Used", _cur_evac_fail_recalc_used);
297 trace_line("Remove Self Forwards",_cur_evac_fail_remove_self_forwards);
298 trace_line("Restore RemSet", _cur_evac_fail_restore_remsets);
299 }
300 debug_line("Choose CSet", (_recorded_young_cset_choice_time_ms + _recorded_non_young_cset_choice_time_ms));
301 debug_line("Preserve CM Refs", _recorded_preserve_cm_referents_time_ms);
302 debug_line("Reference Processing", _cur_ref_proc_time_ms);
303 debug_line("Reference Enqueuing", _cur_ref_enq_time_ms);
304 debug_line("Redirty Cards", _recorded_redirty_logged_cards_time_ms);
305 trace_phase(_gc_par_phases[RedirtyCards]);
306 trace_phase(_gc_par_phases[PreserveCMReferents]);
307 if (G1EagerReclaimHumongousObjects) {
308 debug_line("Humongous Register", _cur_fast_reclaim_humongous_register_time_ms);
309 trace_line_sz("Humongous Total", _cur_fast_reclaim_humongous_total);
310 trace_line_sz("Humongous Candidate", _cur_fast_reclaim_humongous_candidates);
311 debug_line("Humongous Reclaim", _cur_fast_reclaim_humongous_time_ms);
312 trace_line_sz("Humongous Reclaimed", _cur_fast_reclaim_humongous_reclaimed);
313 }
314 if (_cur_verify_after_time_ms > 0.0) {
315 debug_line("Verify After", _cur_verify_after_time_ms);
316 }
317 }
318
319 G1GCParPhaseTimesTracker::G1GCParPhaseTimesTracker(G1GCPhaseTimes* phase_times, G1GCPhaseTimes::GCParPhases phase, uint worker_id) :
320 _phase_times(phase_times), _phase(phase), _worker_id(worker_id) {
321 if (_phase_times != NULL) {
322 _start_time = os::elapsedTime();
323 }
324 }
325
326 G1GCParPhaseTimesTracker::~G1GCParPhaseTimesTracker() {
327 if (_phase_times != NULL) {
328 _phase_times->record_time_secs(_phase, _worker_id, os::elapsedTime() - _start_time);
329 }
330 }
331