1 /*
2 * Copyright (c) 2013, 2015, 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
95 void G1GCPhaseTimes::note_gc_start(uint active_gc_threads) {
96 assert(active_gc_threads > 0, "The number of threads must be > 0");
97 assert(active_gc_threads <= _max_gc_threads, "The number of active threads must be <= the max number of threads");
98 _gc_start_counter = os::elapsed_counter();
99 _active_gc_threads = active_gc_threads;
100 _cur_expand_heap_time_ms = 0.0;
101 _external_accounted_time_ms = 0.0;
102
103 for (int i = 0; i < GCParPhasesSentinel; i++) {
104 if (_gc_par_phases[i] != NULL) {
105 _gc_par_phases[i]->reset();
106 }
107 }
108 }
109
110 void G1GCPhaseTimes::note_gc_end() {
111 _gc_pause_time_ms = TimeHelper::counter_to_millis(os::elapsed_counter() - _gc_start_counter);
112 for (uint i = 0; i < _active_gc_threads; i++) {
113 double worker_time = _gc_par_phases[GCWorkerEnd]->get(i) - _gc_par_phases[GCWorkerStart]->get(i);
114 record_time_secs(GCWorkerTotal, i , worker_time);
115
116 double worker_known_time =
117 _gc_par_phases[ExtRootScan]->get(i) +
118 _gc_par_phases[SATBFiltering]->get(i) +
119 _gc_par_phases[UpdateRS]->get(i) +
120 _gc_par_phases[ScanRS]->get(i) +
121 _gc_par_phases[CodeRoots]->get(i) +
122 _gc_par_phases[ObjCopy]->get(i) +
123 _gc_par_phases[Termination]->get(i);
124
125 record_time_secs(Other, i, worker_time - worker_known_time);
126 }
127
128 for (int i = 0; i < GCParPhasesSentinel; i++) {
129 if (_gc_par_phases[i] != NULL) {
130 _gc_par_phases[i]->verify(_active_gc_threads);
131 }
132 }
133 }
134
135 void G1GCPhaseTimes::info_line(const char* str, double value) {
136 log_info(gc, phases)("%s%s: %.1lfms", Indents[1], str, value);
137 }
138
139 void G1GCPhaseTimes::debug_line(const char* str, double value) {
140 log_debug(gc, phases)("%s%s: %.1lfms", Indents[2], str, value);
141 }
142
143 void G1GCPhaseTimes::trace_line(const char* str, double value) {
144 log_trace(gc, phases)("%s%s: %.1lfms", Indents[3], str, value);
145 }
146
147 void G1GCPhaseTimes::trace_line(const char* str, size_t value) {
148 log_trace(gc, phases)("%s%s: " SIZE_FORMAT, Indents[3], str, value);
149 }
150
151 void G1GCPhaseTimes::trace_phase_tasks(const char* indent, G1GCPhaseTimes::GCParPhases phase_id) {
152 LogHandle(gc, phases, task) log;
153 if (!log.is_trace()) {
154 return;
155 }
156 ResourceMark rm;
157 outputStream* out = log.trace_stream();
158 out->print("%s%-25s", indent, "");
159 for (uint i = 0; i < _active_gc_threads; ++i) {
160 out->print(" %4.1lf", get_time_ms(phase_id, i));
161 }
162 out->print_cr("");
163 }
164
165 void G1GCPhaseTimes::trace_phase_counts(const char* indent, G1GCPhaseTimes::GCParPhases phase_id) {
166 LogHandle(gc, phases, task) log;
167 if (!log.is_trace()) {
168 return;
169 }
170 ResourceMark rm;
171 outputStream* out = log.trace_stream();
172 out->print("%s%-25s", indent, "");
173 for (uint i = 0; i < _active_gc_threads; ++i) {
174 out->print(" " SIZE_FORMAT, get_thread_work_item(phase_id, i));
175 }
176 out->print_cr("");
177 }
178
179 void G1GCPhaseTimes::debug_phase(G1GCPhaseTimes::GCParPhases phase_id) {
180 WorkerDataArray<double>* phase = _gc_par_phases[phase_id];
181 log_debug(gc, phases)("%s%-25s Min: %4.1lf, Avg: %4.1lf, Max: %4.1lf, Diff: %4.1lf, Sum: %4.1lf",
182 Indents[2], phase->title(),
183 min_time_ms(phase_id), average_time_ms(phase_id), max_time_ms(phase_id),
184 max_time_ms(phase_id) - min_time_ms(phase_id), sum_time_ms(phase_id));
185 trace_phase_tasks(Indents[2], phase_id);
186 if (phase->thread_work_items() != NULL) {
187 log_debug(gc, phases)("%s%-25s Min: " SIZE_FORMAT ", Avg: %4.1lf, Max: " SIZE_FORMAT ", Diff: " SIZE_FORMAT ", Sum: " SIZE_FORMAT,
188 Indents[3], phase->thread_work_items()->title(),
189 min_thread_work_items(phase_id), average_thread_work_items(phase_id), max_thread_work_items(phase_id),
190 max_thread_work_items(phase_id) - min_thread_work_items(phase_id), sum_thread_work_items(phase_id));
191 trace_phase_counts(Indents[3], phase_id);
192 }
193 }
194
195 void G1GCPhaseTimes::trace_phase(G1GCPhaseTimes::GCParPhases phase_id) {
196 WorkerDataArray<double>* phase = _gc_par_phases[phase_id];
197 log_trace(gc, phases)("%s%-25s Min: %4.1lf, Avg: %4.1lf, Max: %4.1lf, Diff: %4.1lf, Sum: %4.1lf",
198 Indents[3], phase->title(),
199 min_time_ms(phase_id), average_time_ms(phase_id), max_time_ms(phase_id),
200 max_time_ms(phase_id) - min_time_ms(phase_id), sum_time_ms(phase_id));
201 trace_phase_tasks(Indents[3], phase_id);
202 if (phase->thread_work_items() != NULL) {
203 log_trace(gc, phases)("%s%-25s Min: " SIZE_FORMAT ", Avg: %4.1lf, Max: " SIZE_FORMAT ", Diff: " SIZE_FORMAT ", Sum: " SIZE_FORMAT,
204 Indents[4], phase->thread_work_items()->title(),
205 min_thread_work_items(phase_id), average_thread_work_items(phase_id), max_thread_work_items(phase_id),
206 max_thread_work_items(phase_id) - min_thread_work_items(phase_id), sum_thread_work_items(phase_id));
207 trace_phase_counts(Indents[4], phase_id);
208 }
209 }
210
211 void G1GCPhaseTimes::trace_phase_no_sum(G1GCPhaseTimes::GCParPhases phase_id) {
212 WorkerDataArray<double>* phase = _gc_par_phases[phase_id];
213 log_trace(gc, phases)("%s%-25s Min: %4.1lf, Avg: %4.1lf, Max: %4.1lf, Diff: %4.1lf",
214 Indents[3], phase->title(),
215 min_time_ms(phase_id), average_time_ms(phase_id), max_time_ms(phase_id),
216 max_time_ms(phase_id) - min_time_ms(phase_id));
217 trace_phase_tasks(Indents[3], phase_id);
218 assert(phase->thread_work_items() == NULL, "work_items not implemented for no_sum.");
219 }
220
221 double G1GCPhaseTimes::accounted_time_ms() {
222 // First subtract any externally accounted time
223 double misc_time_ms = _external_accounted_time_ms;
224
225 // Subtract the root region scanning wait time. It's initialized to
226 // zero at the start of the pause.
227 misc_time_ms += _root_region_scan_wait_time_ms;
228
229 misc_time_ms += _cur_collection_par_time_ms;
230
231 // Now subtract the time taken to fix up roots in generated code
232 misc_time_ms += _cur_collection_code_root_fixup_time_ms;
233
234 // Strong code root purge time
235 misc_time_ms += _cur_strong_code_root_purge_time_ms;
236
237 if (G1StringDedup::is_enabled()) {
238 // String dedup fixup time
239 misc_time_ms += _cur_string_dedup_fixup_time_ms;
240 }
241
242 // Subtract the time taken to clean the card table from the
243 // current value of "other time"
244 misc_time_ms += _cur_clear_ct_time_ms;
245
246 // Remove expand heap time from "other time"
247 misc_time_ms += _cur_expand_heap_time_ms;
248
249 return misc_time_ms;
250 }
251
252 // record the time a phase took in seconds
253 void G1GCPhaseTimes::record_time_secs(GCParPhases phase, uint worker_i, double secs) {
254 _gc_par_phases[phase]->set(worker_i, secs);
255 }
256
257 // add a number of seconds to a phase
258 void G1GCPhaseTimes::add_time_secs(GCParPhases phase, uint worker_i, double secs) {
259 _gc_par_phases[phase]->add(worker_i, secs);
260 }
261
262 void G1GCPhaseTimes::record_thread_work_item(GCParPhases phase, uint worker_i, size_t count) {
263 _gc_par_phases[phase]->set_thread_work_item(worker_i, count);
264 }
265
266 // return the average time for a phase in milliseconds
267 double G1GCPhaseTimes::average_time_ms(GCParPhases phase) {
268 return _gc_par_phases[phase]->average(_active_gc_threads) * 1000.0;
269 }
270
271 double G1GCPhaseTimes::get_time_ms(GCParPhases phase, uint worker_i) {
272 return _gc_par_phases[phase]->get(worker_i) * 1000.0;
273 }
274
275 double G1GCPhaseTimes::sum_time_ms(GCParPhases phase) {
276 return _gc_par_phases[phase]->sum(_active_gc_threads) * 1000.0;
277 }
278
279 double G1GCPhaseTimes::min_time_ms(GCParPhases phase) {
280 return _gc_par_phases[phase]->minimum(_active_gc_threads) * 1000.0;
281 }
282
283 double G1GCPhaseTimes::max_time_ms(GCParPhases phase) {
284 return _gc_par_phases[phase]->maximum(_active_gc_threads) * 1000.0;
285 }
286
287 size_t G1GCPhaseTimes::get_thread_work_item(GCParPhases phase, uint worker_i) {
288 assert(_gc_par_phases[phase]->thread_work_items() != NULL, "No sub count");
289 return _gc_par_phases[phase]->thread_work_items()->get(worker_i);
290 }
291
292 size_t G1GCPhaseTimes::sum_thread_work_items(GCParPhases phase) {
293 assert(_gc_par_phases[phase]->thread_work_items() != NULL, "No sub count");
294 return _gc_par_phases[phase]->thread_work_items()->sum(_active_gc_threads);
295 }
296
297 double G1GCPhaseTimes::average_thread_work_items(GCParPhases phase) {
298 assert(_gc_par_phases[phase]->thread_work_items() != NULL, "No sub count");
299 return _gc_par_phases[phase]->thread_work_items()->average(_active_gc_threads);
300 }
301
302 size_t G1GCPhaseTimes::min_thread_work_items(GCParPhases phase) {
303 assert(_gc_par_phases[phase]->thread_work_items() != NULL, "No sub count");
304 return _gc_par_phases[phase]->thread_work_items()->minimum(_active_gc_threads);
305 }
306
307 size_t G1GCPhaseTimes::max_thread_work_items(GCParPhases phase) {
308 assert(_gc_par_phases[phase]->thread_work_items() != NULL, "No sub count");
309 return _gc_par_phases[phase]->thread_work_items()->maximum(_active_gc_threads);
310 }
311
312 void G1GCPhaseTimes::print() {
313 note_gc_end();
314
315 if (_root_region_scan_wait_time_ms > 0.0) {
316 info_line("Root Region Scan Waiting", _root_region_scan_wait_time_ms);
317 }
318
319 info_line("Evacuate Collection Set", _cur_collection_par_time_ms);
320 trace_phase_no_sum(GCWorkerStart);
321 debug_phase(ExtRootScan);
322 for (int i = ThreadRoots; i <= SATBFiltering; i++) {
323 trace_phase((GCParPhases) i);
324 }
325 debug_phase(UpdateRS);
326 if (ConcurrentG1Refine::hot_card_cache_enabled()) {
327 trace_phase(ScanHCC);
328 }
329 debug_phase(ScanRS);
330 debug_phase(CodeRoots);
331 debug_phase(ObjCopy);
332 debug_phase(Termination);
333 debug_phase(Other);
334 debug_phase(GCWorkerTotal);
335 trace_phase_no_sum(GCWorkerEnd);
336
337 info_line("Code Roots", _cur_collection_code_root_fixup_time_ms + _cur_strong_code_root_purge_time_ms);
338 debug_line("Code Roots Fixup", _cur_collection_code_root_fixup_time_ms);
339 debug_line("Code Roots Purge", _cur_strong_code_root_purge_time_ms);
340
341 if (G1StringDedup::is_enabled()) {
342 info_line("String Dedup Fixup", _cur_string_dedup_fixup_time_ms);
343 debug_phase(StringDedupQueueFixup);
344 debug_phase(StringDedupTableFixup);
345 }
346 info_line("Clear Card Table", _cur_clear_ct_time_ms);
347 info_line("Expand Heap After Collection", _cur_expand_heap_time_ms);
348
349 double free_cset_time = _recorded_young_free_cset_time_ms + _recorded_non_young_free_cset_time_ms;
350 info_line("Free Collection Set", free_cset_time);
351 debug_line("Young Free Collection Set", _recorded_young_free_cset_time_ms);
352 debug_line("Non-Young Free Collection Set", _recorded_non_young_free_cset_time_ms);
353
354 double misc_time_ms = _gc_pause_time_ms - accounted_time_ms() - free_cset_time;
355 info_line("Other", misc_time_ms);
356 if (_cur_verify_before_time_ms > 0.0) {
357 debug_line("Verify Before", _cur_verify_before_time_ms);
358 }
359 if (G1CollectedHeap::heap()->evacuation_failed()) {
360 double evac_fail_handling = _cur_evac_fail_recalc_used + _cur_evac_fail_remove_self_forwards +
361 _cur_evac_fail_restore_remsets;
362 debug_line("Evacuation Failure", evac_fail_handling);
363 trace_line("Recalculate Used", _cur_evac_fail_recalc_used);
364 trace_line("Remove Self Forwards",_cur_evac_fail_remove_self_forwards);
365 trace_line("Restore RemSet", _cur_evac_fail_restore_remsets);
366 }
367 debug_line("Choose CSet", (_recorded_young_cset_choice_time_ms + _recorded_non_young_cset_choice_time_ms));
368 debug_line("Ref Proc", _cur_ref_proc_time_ms);
369 debug_line("Ref Enq", _cur_ref_enq_time_ms);
370 debug_line("Redirty Cards", _recorded_redirty_logged_cards_time_ms);
371 trace_phase(RedirtyCards);
372 if (G1EagerReclaimHumongousObjects) {
373 debug_line("Humongous Register", _cur_fast_reclaim_humongous_register_time_ms);
374 trace_line("Humongous Total", _cur_fast_reclaim_humongous_total);
375 trace_line("Humongous Candidate", _cur_fast_reclaim_humongous_candidates);
376 debug_line("Humongous Reclaim", _cur_fast_reclaim_humongous_time_ms);
377 trace_line("Humongous Reclaimed", _cur_fast_reclaim_humongous_reclaimed);
378 }
379 if (_cur_verify_after_time_ms > 0.0) {
380 debug_line("Verify After", _cur_verify_after_time_ms);
381 }
382 }
383
384 G1GCParPhaseTimesTracker::G1GCParPhaseTimesTracker(G1GCPhaseTimes* phase_times, G1GCPhaseTimes::GCParPhases phase, uint worker_id) :
385 _phase_times(phase_times), _phase(phase), _worker_id(worker_id) {
386 if (_phase_times != NULL) {
387 _start_time = os::elapsedTime();
388 }
389 }
390
391 G1GCParPhaseTimesTracker::~G1GCParPhaseTimesTracker() {
392 if (_phase_times != NULL) {
393 _phase_times->record_time_secs(_phase, _worker_id, os::elapsedTime() - _start_time);
394 }
395 }
396