1 /*
2 * Copyright (c) 2012, 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
26 #include "precompiled.hpp"
27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
28 #include "gc_implementation/g1/g1GCPhaseTimes.hpp"
29 #include "gc_implementation/g1/g1Log.hpp"
30
31 // Helper class for avoiding interleaved logging
32 class LineBuffer: public StackObj {
33
34 private:
35 static const int BUFFER_LEN = 1024;
36 static const int INDENT_CHARS = 3;
37 char _buffer[BUFFER_LEN];
38 int _indent_level;
39 int _cur;
40
41 void vappend(const char* format, va_list ap) {
42 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap);
43 if (res != -1) {
44 _cur += res;
45 } else {
46 DEBUG_ONLY(warning("buffer too small in LineBuffer");)
47 _buffer[BUFFER_LEN -1] = 0;
48 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again
49 }
50 }
51
52 public:
53 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) {
54 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) {
55 _buffer[_cur] = ' ';
56 }
57 }
58
59 #ifndef PRODUCT
60 ~LineBuffer() {
61 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?");
62 }
63 #endif
64
65 void append(const char* format, ...) {
66 va_list ap;
67 va_start(ap, format);
68 vappend(format, ap);
69 va_end(ap);
70 }
71
72 void append_and_print_cr(const char* format, ...) {
73 va_list ap;
74 va_start(ap, format);
75 vappend(format, ap);
76 va_end(ap);
77 gclog_or_tty->print_cr("%s", _buffer);
78 _cur = _indent_level * INDENT_CHARS;
79 }
80 };
81
82 template <class T>
83 void WorkerDataArray<T>::print(int level, const char* title) {
84 if (_length == 1) {
85 // No need for min, max, average and sum for only one worker
86 LineBuffer buf(level);
87 buf.append("[%s: ", title);
88 buf.append(_print_format, _data[0]);
89 buf.append_and_print_cr("]");
90 return;
91 }
92
93 T min = _data[0];
94 T max = _data[0];
95 T sum = 0;
96
97 LineBuffer buf(level);
98 buf.append("[%s:", title);
99 for (uint i = 0; i < _length; ++i) {
100 T val = _data[i];
101 min = MIN2(val, min);
102 max = MAX2(val, max);
103 sum += val;
104 if (G1Log::finest()) {
105 buf.append(" ");
106 buf.append(_print_format, val);
107 }
108 }
109
110 if (G1Log::finest()) {
111 buf.append_and_print_cr("");
112 }
113
114 double avg = (double)sum / (double)_length;
115 buf.append(" Min: ");
116 buf.append(_print_format, min);
117 buf.append(", Avg: ");
118 buf.append("%.1lf", avg); // Always print average as a double
119 buf.append(", Max: ");
120 buf.append(_print_format, max);
121 buf.append(", Diff: ");
122 buf.append(_print_format, max - min);
123 if (_print_sum) {
124 // for things like the start and end times the sum is not
125 // that relevant
126 buf.append(", Sum: ");
127 buf.append(_print_format, sum);
128 }
129 buf.append_and_print_cr("]");
130 }
131
132 #ifdef ASSERT
133
134 template <class T>
135 void WorkerDataArray<T>::reset() {
136 for (uint i = 0; i < _length; i++) {
137 _data[i] = (T)-1;
138 }
139 }
140
141 template <class T>
142 void WorkerDataArray<T>::verify() {
143 for (uint i = 0; i < _length; i++) {
144 assert(_data[i] >= (T)0, err_msg("Invalid data for worker %d", i));
145 }
146 }
147
148 #endif
149
150 G1GCPhaseTimes::G1GCPhaseTimes(uint max_gc_threads) :
151 _max_gc_threads(max_gc_threads),
152 _min_clear_cc_time_ms(-1.0),
153 _max_clear_cc_time_ms(-1.0),
154 _cur_clear_cc_time_ms(0.0),
155 _cum_clear_cc_time_ms(0.0),
156 _num_cc_clears(0L),
157 _last_gc_worker_start_times_ms(_max_gc_threads, "%.1lf", false),
158 _last_ext_root_scan_times_ms(_max_gc_threads, "%.1lf"),
159 _last_satb_filtering_times_ms(_max_gc_threads, "%.1lf"),
160 _last_update_rs_times_ms(_max_gc_threads, "%.1lf"),
161 _last_update_rs_processed_buffers(_max_gc_threads, "%d"),
162 _last_scan_rs_times_ms(_max_gc_threads, "%.1lf"),
163 _last_obj_copy_times_ms(_max_gc_threads, "%.1lf"),
164 _last_termination_times_ms(_max_gc_threads, "%.1lf"),
165 _last_termination_attempts(_max_gc_threads, SIZE_FORMAT),
166 _last_gc_worker_end_times_ms(_max_gc_threads, "%.1lf", false),
167 _last_gc_worker_times_ms(_max_gc_threads, "%.1lf"),
168 _last_gc_worker_other_times_ms(_max_gc_threads, "%.1lf")
169 {
170 assert(max_gc_threads > 0, "Must have some GC threads");
171 }
172
173 void G1GCPhaseTimes::note_gc_start(double pause_start_time_sec, uint active_gc_threads,
174 bool is_young_gc, bool is_initial_mark_gc, GCCause::Cause gc_cause) {
175 assert(active_gc_threads > 0, "The number of threads must be > 0");
176 assert(active_gc_threads <= _max_gc_threads, "The number of active threads must be <= the max nubmer of threads");
177 _active_gc_threads = active_gc_threads;
178 _pause_start_time_sec = pause_start_time_sec;
179 _is_young_gc = is_young_gc;
180 _is_initial_mark_gc = is_initial_mark_gc;
181 _gc_cause = gc_cause;
182
183 _last_gc_worker_start_times_ms.reset();
184 _last_ext_root_scan_times_ms.reset();
185 _last_satb_filtering_times_ms.reset();
186 _last_update_rs_times_ms.reset();
187 _last_update_rs_processed_buffers.reset();
188 _last_scan_rs_times_ms.reset();
189 _last_obj_copy_times_ms.reset();
190 _last_termination_times_ms.reset();
191 _last_termination_attempts.reset();
192 _last_gc_worker_end_times_ms.reset();
193 _last_gc_worker_times_ms.reset();
194 _last_gc_worker_other_times_ms.reset();
195 }
196
197 void G1GCPhaseTimes::note_gc_end(double pause_end_time_sec) {
198 _last_gc_worker_start_times_ms.verify();
199 _last_ext_root_scan_times_ms.verify();
200 _last_satb_filtering_times_ms.verify();
201 _last_update_rs_times_ms.verify();
202 _last_update_rs_processed_buffers.verify();
203 _last_scan_rs_times_ms.verify();
204 _last_obj_copy_times_ms.verify();
205 _last_termination_times_ms.verify();
206 _last_termination_attempts.verify();
207 _last_gc_worker_end_times_ms.verify();
208
209 if (G1Log::fine()) {
210 double pause_time_ms = (pause_end_time_sec - _pause_start_time_sec) * MILLIUNITS;
211
212 for (uint i = 0; i < _active_gc_threads; i++) {
213 _last_gc_worker_times_ms.set(i,
214 _last_gc_worker_end_times_ms.get(i) - _last_gc_worker_start_times_ms.get(i));
215
216 double worker_known_time = _last_ext_root_scan_times_ms.get(i) +
217 _last_satb_filtering_times_ms.get(i) +
218 _last_update_rs_times_ms.get(i) +
219 _last_scan_rs_times_ms.get(i) +
220 _last_obj_copy_times_ms.get(i) +
221 _last_termination_times_ms.get(i);
222
223 _last_gc_worker_other_times_ms.set(i,
224 _last_gc_worker_times_ms.get(i) - worker_known_time);
225 }
226
227 _last_gc_worker_times_ms.verify();
228 _last_gc_worker_other_times_ms.verify();
229
230 print(pause_time_ms);
231 }
232
233 }
234
235 void G1GCPhaseTimes::print_stats(int level, const char* str, double value) {
236 LineBuffer(level).append_and_print_cr("[%s: %.1lf ms]", str, value);
237 }
238
239 void G1GCPhaseTimes::print_stats(int level, const char* str, double value, int workers) {
240 LineBuffer(level).append_and_print_cr("[%s: %.1lf ms, GC Workers: %d]", str, value, workers);
241 }
242
243 double G1GCPhaseTimes::accounted_time_ms() {
244 // Subtract the root region scanning wait time. It's initialized to
245 // zero at the start of the pause.
246 double misc_time_ms = _root_region_scan_wait_time_ms;
247
248 misc_time_ms += _cur_collection_par_time_ms;
249
250 // Now subtract the time taken to fix up roots in generated code
251 misc_time_ms += _cur_collection_code_root_fixup_time_ms;
252
253 // Subtract the time taken to clean the card table from the
254 // current value of "other time"
255 misc_time_ms += _cur_clear_ct_time_ms;
256
257 return misc_time_ms;
258 }
259
260 void G1GCPhaseTimes::print(double pause_time_ms) {
261
262 if (PrintGCTimeStamps) {
263 gclog_or_tty->stamp();
264 gclog_or_tty->print(": ");
265 }
266
267 GCCauseString gc_cause_str = GCCauseString("GC pause", _gc_cause)
268 .append(_is_young_gc ? " (young)" : " (mixed)")
269 .append(_is_initial_mark_gc ? " (initial-mark)" : "");
270 gclog_or_tty->print_cr("[%s, %3.7f secs]", (const char*)gc_cause_str, pause_time_ms / 1000.0);
271
272 if (!G1Log::finer()) {
273 return;
274 }
275
276 if (_root_region_scan_wait_time_ms > 0.0) {
277 print_stats(1, "Root Region Scan Waiting", _root_region_scan_wait_time_ms);
278 }
279 if (G1CollectedHeap::use_parallel_gc_threads()) {
280 print_stats(1, "Parallel Time", _cur_collection_par_time_ms, _active_gc_threads);
281 _last_gc_worker_start_times_ms.print(2, "GC Worker Start (ms)");
282 _last_ext_root_scan_times_ms.print(2, "Ext Root Scanning (ms)");
283 if (_last_satb_filtering_times_ms.sum() > 0.0) {
284 _last_satb_filtering_times_ms.print(2, "SATB Filtering (ms)");
285 }
286 _last_update_rs_times_ms.print(2, "Update RS (ms)");
287 if (G1Log::finest()) {
288 _last_update_rs_processed_buffers.print(3, "Processed Buffers");
289 }
290 _last_scan_rs_times_ms.print(2, "Scan RS (ms)");
291 _last_obj_copy_times_ms.print(2, "Object Copy (ms)");
292 _last_termination_times_ms.print(2, "Termination (ms)");
293 if (G1Log::finest()) {
294 _last_termination_attempts.print(3, "Termination Attempts");
295 }
296 _last_gc_worker_other_times_ms.print(2, "GC Worker Other (ms)");
297 _last_gc_worker_times_ms.print(2, "GC Worker Total (ms)");
298 _last_gc_worker_end_times_ms.print(2, "GC Worker End (ms)");
299 } else {
300 _last_ext_root_scan_times_ms.print(1, "Ext Root Scanning (ms)");
301 if (_last_satb_filtering_times_ms.sum() > 0.0) {
302 _last_satb_filtering_times_ms.print(1, "SATB Filtering (ms)");
303 }
304 _last_update_rs_times_ms.print(1, "Update RS (ms)");
305 if (G1Log::finest()) {
306 _last_update_rs_processed_buffers.print(2, "Processed Buffers");
307 }
308 _last_scan_rs_times_ms.print(1, "Scan RS (ms)");
309 _last_obj_copy_times_ms.print(1, "Object Copy (ms)");
310 }
311 print_stats(1, "Code Root Fixup", _cur_collection_code_root_fixup_time_ms);
312 print_stats(1, "Clear CT", _cur_clear_ct_time_ms);
313 if (Verbose && G1Log::finest()) {
314 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms);
315 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms);
316 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms);
317 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms);
318 if (_num_cc_clears > 0) {
319 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears));
320 }
321 }
322 double misc_time_ms = pause_time_ms - accounted_time_ms();
323 print_stats(1, "Other", misc_time_ms);
324 print_stats(2, "Choose CSet",
325 (_recorded_young_cset_choice_time_ms +
326 _recorded_non_young_cset_choice_time_ms));
327 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms);
328 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms);
329 print_stats(2, "Free CSet",
330 (_recorded_young_free_cset_time_ms +
331 _recorded_non_young_free_cset_time_ms));
332 }
333
334 void G1GCPhaseTimes::record_cc_clear_time_ms(double ms) {
335 if (!(Verbose && G1Log::finest())) {
336 return;
337 }
338
339 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) {
340 _min_clear_cc_time_ms = ms;
341 }
342 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) {
343 _max_clear_cc_time_ms = ms;
344 }
345 _cur_clear_cc_time_ms = ms;
346 _cum_clear_cc_time_ms += ms;
347 _num_cc_clears++;
348 }