author | apetrusenko |
Fri, 16 Apr 2010 08:48:16 -0700 | |
changeset 5347 | 1de2255c6c2e |
parent 5344 | f78ef2531f44 |
child 5350 | cccf0925702e |
permissions | -rw-r--r-- |
1374 | 1 |
/* |
2105 | 2 |
* Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
1374 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
|
20 |
* CA 95054 USA or visit www.sun.com if you need additional information or |
|
21 |
* have any questions. |
|
22 |
* |
|
23 |
*/ |
|
24 |
||
25 |
#include "incls/_precompiled.incl" |
|
26 |
#include "incls/_g1CollectorPolicy.cpp.incl" |
|
27 |
||
28 |
#define PREDICTIONS_VERBOSE 0 |
|
29 |
||
30 |
// <NEW PREDICTION> |
|
31 |
||
32 |
// Different defaults for different number of GC threads |
|
33 |
// They were chosen by running GCOld and SPECjbb on debris with different |
|
34 |
// numbers of GC threads and choosing them based on the results |
|
35 |
||
36 |
// all the same |
|
37 |
static double rs_length_diff_defaults[] = { |
|
38 |
0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 |
|
39 |
}; |
|
40 |
||
41 |
static double cost_per_card_ms_defaults[] = { |
|
42 |
0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 |
|
43 |
}; |
|
44 |
||
45 |
static double cost_per_scan_only_region_ms_defaults[] = { |
|
46 |
1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
|
47 |
}; |
|
48 |
||
49 |
// all the same |
|
50 |
static double fully_young_cards_per_entry_ratio_defaults[] = { |
|
51 |
1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
|
52 |
}; |
|
53 |
||
54 |
static double cost_per_entry_ms_defaults[] = { |
|
55 |
0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 |
|
56 |
}; |
|
57 |
||
58 |
static double cost_per_byte_ms_defaults[] = { |
|
59 |
0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 |
|
60 |
}; |
|
61 |
||
62 |
// these should be pretty consistent |
|
63 |
static double constant_other_time_ms_defaults[] = { |
|
64 |
5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 |
|
65 |
}; |
|
66 |
||
67 |
||
68 |
static double young_other_cost_per_region_ms_defaults[] = { |
|
69 |
0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 |
|
70 |
}; |
|
71 |
||
72 |
static double non_young_other_cost_per_region_ms_defaults[] = { |
|
73 |
1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 |
|
74 |
}; |
|
75 |
||
76 |
// </NEW PREDICTION> |
|
77 |
||
78 |
G1CollectorPolicy::G1CollectorPolicy() : |
|
79 |
_parallel_gc_threads((ParallelGCThreads > 0) ? ParallelGCThreads : 1), |
|
80 |
_n_pauses(0), |
|
81 |
_recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
82 |
_recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
83 |
_recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
84 |
_recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
85 |
_recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
86 |
_recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
87 |
_all_pause_times_ms(new NumberSeq()), |
|
88 |
_stop_world_start(0.0), |
|
89 |
_all_stop_world_times_ms(new NumberSeq()), |
|
90 |
_all_yield_times_ms(new NumberSeq()), |
|
91 |
||
92 |
_all_mod_union_times_ms(new NumberSeq()), |
|
93 |
||
2344 | 94 |
_summary(new Summary()), |
95 |
_abandoned_summary(new AbandonedSummary()), |
|
1374 | 96 |
|
3590
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
97 |
#ifndef PRODUCT |
1374 | 98 |
_cur_clear_ct_time_ms(0.0), |
3590
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
99 |
_min_clear_cc_time_ms(-1.0), |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
100 |
_max_clear_cc_time_ms(-1.0), |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
101 |
_cur_clear_cc_time_ms(0.0), |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
102 |
_cum_clear_cc_time_ms(0.0), |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
103 |
_num_cc_clears(0L), |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
104 |
#endif |
1374 | 105 |
|
106 |
_region_num_young(0), |
|
107 |
_region_num_tenured(0), |
|
108 |
_prev_region_num_young(0), |
|
109 |
_prev_region_num_tenured(0), |
|
110 |
||
111 |
_aux_num(10), |
|
112 |
_all_aux_times_ms(new NumberSeq[_aux_num]), |
|
113 |
_cur_aux_start_times_ms(new double[_aux_num]), |
|
114 |
_cur_aux_times_ms(new double[_aux_num]), |
|
115 |
_cur_aux_times_set(new bool[_aux_num]), |
|
116 |
||
117 |
_concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
118 |
_concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
119 |
_concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
120 |
||
121 |
// <NEW PREDICTION> |
|
122 |
||
123 |
_alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
124 |
_prev_collection_pause_end_ms(0.0), |
|
125 |
_pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
126 |
_rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
127 |
_cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
128 |
_cost_per_scan_only_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
129 |
_fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
130 |
_partially_young_cards_per_entry_ratio_seq( |
|
131 |
new TruncatedSeq(TruncatedSeqLength)), |
|
132 |
_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
133 |
_partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
134 |
_cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
135 |
_cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
136 |
_cost_per_scan_only_region_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
137 |
_constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
138 |
_young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
139 |
_non_young_other_cost_per_region_ms_seq( |
|
140 |
new TruncatedSeq(TruncatedSeqLength)), |
|
141 |
||
142 |
_pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
143 |
_scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
144 |
_rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
145 |
||
2741 | 146 |
_pause_time_target_ms((double) MaxGCPauseMillis), |
1374 | 147 |
|
148 |
// </NEW PREDICTION> |
|
149 |
||
150 |
_in_young_gc_mode(false), |
|
151 |
_full_young_gcs(true), |
|
152 |
_full_young_pause_num(0), |
|
153 |
_partial_young_pause_num(0), |
|
154 |
||
155 |
_during_marking(false), |
|
156 |
_in_marking_window(false), |
|
157 |
_in_marking_window_im(false), |
|
158 |
||
159 |
_known_garbage_ratio(0.0), |
|
160 |
_known_garbage_bytes(0), |
|
161 |
||
162 |
_young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), |
|
163 |
_target_pause_time_ms(-1.0), |
|
164 |
||
165 |
_recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
166 |
||
167 |
_recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
168 |
_recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), |
|
169 |
||
170 |
_recent_avg_pause_time_ratio(0.0), |
|
171 |
_num_markings(0), |
|
172 |
_n_marks(0), |
|
173 |
_n_pauses_at_mark_end(0), |
|
174 |
||
175 |
_all_full_gc_times_ms(new NumberSeq()), |
|
176 |
||
177 |
// G1PausesBtwnConcMark defaults to -1 |
|
178 |
// so the hack is to do the cast QQQ FIXME |
|
179 |
_pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), |
|
180 |
_n_marks_since_last_pause(0), |
|
5243
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
181 |
_initiate_conc_mark_if_possible(false), |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
182 |
_during_initial_mark_pause(false), |
1374 | 183 |
_should_revert_to_full_young_gcs(false), |
184 |
_last_full_young_gc(false), |
|
185 |
||
186 |
_prev_collection_pause_used_at_end_bytes(0), |
|
187 |
||
188 |
_collection_set(NULL), |
|
189 |
#ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
|
190 |
#pragma warning( disable:4355 ) // 'this' : used in base member initializer list |
|
191 |
#endif // _MSC_VER |
|
192 |
||
193 |
_short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", |
|
194 |
G1YoungSurvRateNumRegionsSummary)), |
|
195 |
_survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", |
|
2009 | 196 |
G1YoungSurvRateNumRegionsSummary)), |
1374 | 197 |
// add here any more surv rate groups |
2009 | 198 |
_recorded_survivor_regions(0), |
199 |
_recorded_survivor_head(NULL), |
|
200 |
_recorded_survivor_tail(NULL), |
|
5240 | 201 |
_survivors_age_table(true), |
202 |
||
203 |
_gc_overhead_perc(0.0) |
|
2009 | 204 |
|
1374 | 205 |
{ |
3697
ea9211aa02f5
6819085: G1: use larger and/or user settable region size
tonyp
parents:
3691
diff
changeset
|
206 |
// Set up the region size and associated fields. Given that the |
ea9211aa02f5
6819085: G1: use larger and/or user settable region size
tonyp
parents:
3691
diff
changeset
|
207 |
// policy is created before the heap, we have to set this up here, |
ea9211aa02f5
6819085: G1: use larger and/or user settable region size
tonyp
parents:
3691
diff
changeset
|
208 |
// so it's done as soon as possible. |
ea9211aa02f5
6819085: G1: use larger and/or user settable region size
tonyp
parents:
3691
diff
changeset
|
209 |
HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
4902
991aaddb5165
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
4481
diff
changeset
|
210 |
HeapRegionRemSet::setup_remset_size(); |
3697
ea9211aa02f5
6819085: G1: use larger and/or user settable region size
tonyp
parents:
3691
diff
changeset
|
211 |
|
5347
1de2255c6c2e
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
5344
diff
changeset
|
212 |
// Verify PLAB sizes |
1de2255c6c2e
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
5344
diff
changeset
|
213 |
const uint region_size = HeapRegion::GrainWords; |
1de2255c6c2e
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
5344
diff
changeset
|
214 |
if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
1de2255c6c2e
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
5344
diff
changeset
|
215 |
char buffer[128]; |
1de2255c6c2e
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
5344
diff
changeset
|
216 |
jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
1de2255c6c2e
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
5344
diff
changeset
|
217 |
OldPLABSize > region_size ? "Old" : "Young", region_size); |
1de2255c6c2e
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
5344
diff
changeset
|
218 |
vm_exit_during_initialization(buffer); |
1de2255c6c2e
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
5344
diff
changeset
|
219 |
} |
1de2255c6c2e
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
5344
diff
changeset
|
220 |
|
1374 | 221 |
_recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
222 |
_prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; |
|
223 |
||
224 |
_par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
|
225 |
_par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; |
|
226 |
_par_last_scan_only_times_ms = new double[_parallel_gc_threads]; |
|
227 |
_par_last_scan_only_regions_scanned = new double[_parallel_gc_threads]; |
|
228 |
||
229 |
_par_last_update_rs_start_times_ms = new double[_parallel_gc_threads]; |
|
230 |
_par_last_update_rs_times_ms = new double[_parallel_gc_threads]; |
|
231 |
_par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; |
|
232 |
||
233 |
_par_last_scan_rs_start_times_ms = new double[_parallel_gc_threads]; |
|
234 |
_par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; |
|
235 |
_par_last_scan_new_refs_times_ms = new double[_parallel_gc_threads]; |
|
236 |
||
237 |
_par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; |
|
238 |
||
239 |
_par_last_termination_times_ms = new double[_parallel_gc_threads]; |
|
240 |
||
241 |
// start conservatively |
|
2741 | 242 |
_expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
1374 | 243 |
|
244 |
// <NEW PREDICTION> |
|
245 |
||
246 |
int index; |
|
247 |
if (ParallelGCThreads == 0) |
|
248 |
index = 0; |
|
249 |
else if (ParallelGCThreads > 8) |
|
250 |
index = 7; |
|
251 |
else |
|
252 |
index = ParallelGCThreads - 1; |
|
253 |
||
254 |
_pending_card_diff_seq->add(0.0); |
|
255 |
_rs_length_diff_seq->add(rs_length_diff_defaults[index]); |
|
256 |
_cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); |
|
257 |
_cost_per_scan_only_region_ms_seq->add( |
|
258 |
cost_per_scan_only_region_ms_defaults[index]); |
|
259 |
_fully_young_cards_per_entry_ratio_seq->add( |
|
260 |
fully_young_cards_per_entry_ratio_defaults[index]); |
|
261 |
_cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
|
262 |
_cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); |
|
263 |
_constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); |
|
264 |
_young_other_cost_per_region_ms_seq->add( |
|
265 |
young_other_cost_per_region_ms_defaults[index]); |
|
266 |
_non_young_other_cost_per_region_ms_seq->add( |
|
267 |
non_young_other_cost_per_region_ms_defaults[index]); |
|
268 |
||
269 |
// </NEW PREDICTION> |
|
270 |
||
2741 | 271 |
double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
272 |
double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
|
1374 | 273 |
guarantee(max_gc_time < time_slice, |
274 |
"Max GC time should not be greater than the time slice"); |
|
275 |
_mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
|
2741 | 276 |
_sigma = (double) G1ConfidencePercent / 100.0; |
1374 | 277 |
|
278 |
// start conservatively (around 50ms is about right) |
|
279 |
_concurrent_mark_init_times_ms->add(0.05); |
|
280 |
_concurrent_mark_remark_times_ms->add(0.05); |
|
281 |
_concurrent_mark_cleanup_times_ms->add(0.20); |
|
282 |
_tenuring_threshold = MaxTenuringThreshold; |
|
283 |
||
5033 | 284 |
// if G1FixedSurvivorSpaceSize is 0 which means the size is not |
285 |
// fixed, then _max_survivor_regions will be calculated at |
|
286 |
// calculate_young_list_target_config during initialization |
|
287 |
_max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
|
2009 | 288 |
|
5240 | 289 |
assert(GCTimeRatio > 0, |
290 |
"we should have set it to a default value set_g1_gc_flags() " |
|
291 |
"if a user set it to 0"); |
|
292 |
_gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); |
|
293 |
||
1374 | 294 |
initialize_all(); |
295 |
} |
|
296 |
||
297 |
// Increment "i", mod "len" |
|
298 |
static void inc_mod(int& i, int len) { |
|
299 |
i++; if (i == len) i = 0; |
|
300 |
} |
|
301 |
||
302 |
void G1CollectorPolicy::initialize_flags() { |
|
303 |
set_min_alignment(HeapRegion::GrainBytes); |
|
304 |
set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); |
|
2011
d666454081dd
6802413: G1: G1FixedSurvivorSpaceSize should be converted into regions in calculate_survivors_policy()
apetrusenko
parents:
2009
diff
changeset
|
305 |
if (SurvivorRatio < 1) { |
d666454081dd
6802413: G1: G1FixedSurvivorSpaceSize should be converted into regions in calculate_survivors_policy()
apetrusenko
parents:
2009
diff
changeset
|
306 |
vm_exit_during_initialization("Invalid survivor ratio specified"); |
d666454081dd
6802413: G1: G1FixedSurvivorSpaceSize should be converted into regions in calculate_survivors_policy()
apetrusenko
parents:
2009
diff
changeset
|
307 |
} |
1374 | 308 |
CollectorPolicy::initialize_flags(); |
309 |
} |
|
310 |
||
5036
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
311 |
// The easiest way to deal with the parsing of the NewSize / |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
312 |
// MaxNewSize / etc. parameteres is to re-use the code in the |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
313 |
// TwoGenerationCollectorPolicy class. This is similar to what |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
314 |
// ParallelScavenge does with its GenerationSizer class (see |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
315 |
// ParallelScavengeHeap::initialize()). We might change this in the |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
316 |
// future, but it's a good start. |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
317 |
class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
318 |
size_t size_to_region_num(size_t byte_size) { |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
319 |
return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
320 |
} |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
321 |
|
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
322 |
public: |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
323 |
G1YoungGenSizer() { |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
324 |
initialize_flags(); |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
325 |
initialize_size_info(); |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
326 |
} |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
327 |
|
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
328 |
size_t min_young_region_num() { |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
329 |
return size_to_region_num(_min_gen0_size); |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
330 |
} |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
331 |
size_t initial_young_region_num() { |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
332 |
return size_to_region_num(_initial_gen0_size); |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
333 |
} |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
334 |
size_t max_young_region_num() { |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
335 |
return size_to_region_num(_max_gen0_size); |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
336 |
} |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
337 |
}; |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
338 |
|
1374 | 339 |
void G1CollectorPolicy::init() { |
340 |
// Set aside an initial future to_space. |
|
341 |
_g1 = G1CollectedHeap::heap(); |
|
342 |
||
343 |
assert(Heap_lock->owned_by_self(), "Locking discipline."); |
|
344 |
||
2009 | 345 |
initialize_gc_policy_counters(); |
346 |
||
1374 | 347 |
if (G1Gen) { |
348 |
_in_young_gc_mode = true; |
|
349 |
||
5036
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
350 |
G1YoungGenSizer sizer; |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
351 |
size_t initial_region_num = sizer.initial_young_region_num(); |
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
352 |
|
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
353 |
if (UseAdaptiveSizePolicy) { |
1374 | 354 |
set_adaptive_young_list_length(true); |
355 |
_young_list_fixed_length = 0; |
|
356 |
} else { |
|
357 |
set_adaptive_young_list_length(false); |
|
5036
7b652cd72d65
6928065: G1: use existing command line parameters to set the young generation size
tonyp
parents:
5034
diff
changeset
|
358 |
_young_list_fixed_length = initial_region_num; |
1374 | 359 |
} |
360 |
_free_regions_at_end_of_collection = _g1->free_regions(); |
|
361 |
_scan_only_regions_at_end_of_collection = 0; |
|
362 |
calculate_young_list_min_length(); |
|
363 |
guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
|
364 |
calculate_young_list_target_config(); |
|
365 |
} else { |
|
366 |
_young_list_fixed_length = 0; |
|
367 |
_in_young_gc_mode = false; |
|
368 |
} |
|
369 |
} |
|
370 |
||
2009 | 371 |
// Create the jstat counters for the policy. |
372 |
void G1CollectorPolicy::initialize_gc_policy_counters() |
|
373 |
{ |
|
374 |
_gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); |
|
375 |
} |
|
376 |
||
1374 | 377 |
void G1CollectorPolicy::calculate_young_list_min_length() { |
378 |
_young_list_min_length = 0; |
|
379 |
||
380 |
if (!adaptive_young_list_length()) |
|
381 |
return; |
|
382 |
||
383 |
if (_alloc_rate_ms_seq->num() > 3) { |
|
384 |
double now_sec = os::elapsedTime(); |
|
385 |
double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
|
386 |
double alloc_rate_ms = predict_alloc_rate_ms(); |
|
387 |
int min_regions = (int) ceil(alloc_rate_ms * when_ms); |
|
388 |
int current_region_num = (int) _g1->young_list_length(); |
|
389 |
_young_list_min_length = min_regions + current_region_num; |
|
390 |
} |
|
391 |
} |
|
392 |
||
393 |
void G1CollectorPolicy::calculate_young_list_target_config() { |
|
394 |
if (adaptive_young_list_length()) { |
|
395 |
size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
|
396 |
calculate_young_list_target_config(rs_lengths); |
|
397 |
} else { |
|
398 |
if (full_young_gcs()) |
|
399 |
_young_list_target_length = _young_list_fixed_length; |
|
400 |
else |
|
401 |
_young_list_target_length = _young_list_fixed_length / 2; |
|
402 |
_young_list_target_length = MAX2(_young_list_target_length, (size_t)1); |
|
403 |
size_t so_length = calculate_optimal_so_length(_young_list_target_length); |
|
404 |
guarantee( so_length < _young_list_target_length, "invariant" ); |
|
405 |
_young_list_so_prefix_length = so_length; |
|
406 |
} |
|
2009 | 407 |
calculate_survivors_policy(); |
1374 | 408 |
} |
409 |
||
410 |
// This method calculate the optimal scan-only set for a fixed young |
|
411 |
// gen size. I couldn't work out how to reuse the more elaborate one, |
|
412 |
// i.e. calculate_young_list_target_config(rs_length), as the loops are |
|
413 |
// fundamentally different (the other one finds a config for different |
|
414 |
// S-O lengths, whereas here we need to do the opposite). |
|
415 |
size_t G1CollectorPolicy::calculate_optimal_so_length( |
|
416 |
size_t young_list_length) { |
|
417 |
if (!G1UseScanOnlyPrefix) |
|
418 |
return 0; |
|
419 |
||
420 |
if (_all_pause_times_ms->num() < 3) { |
|
421 |
// we won't use a scan-only set at the beginning to allow the rest |
|
422 |
// of the predictors to warm up |
|
423 |
return 0; |
|
424 |
} |
|
425 |
||
426 |
if (_cost_per_scan_only_region_ms_seq->num() < 3) { |
|
427 |
// then, we'll only set the S-O set to 1 for a little bit of time, |
|
428 |
// to get enough information on the scanning cost |
|
429 |
return 1; |
|
430 |
} |
|
431 |
||
432 |
size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
|
433 |
size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
|
434 |
size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
|
435 |
size_t scanned_cards; |
|
436 |
if (full_young_gcs()) |
|
437 |
scanned_cards = predict_young_card_num(adj_rs_lengths); |
|
438 |
else |
|
439 |
scanned_cards = predict_non_young_card_num(adj_rs_lengths); |
|
440 |
double base_time_ms = predict_base_elapsed_time_ms(pending_cards, |
|
441 |
scanned_cards); |
|
442 |
||
443 |
size_t so_length = 0; |
|
444 |
double max_gc_eff = 0.0; |
|
445 |
for (size_t i = 0; i < young_list_length; ++i) { |
|
446 |
double gc_eff = 0.0; |
|
447 |
double pause_time_ms = 0.0; |
|
448 |
predict_gc_eff(young_list_length, i, base_time_ms, |
|
449 |
&gc_eff, &pause_time_ms); |
|
450 |
if (gc_eff > max_gc_eff) { |
|
451 |
max_gc_eff = gc_eff; |
|
452 |
so_length = i; |
|
453 |
} |
|
454 |
} |
|
455 |
||
456 |
// set it to 95% of the optimal to make sure we sample the "area" |
|
457 |
// around the optimal length to get up-to-date survival rate data |
|
458 |
return so_length * 950 / 1000; |
|
459 |
} |
|
460 |
||
461 |
// This is a really cool piece of code! It finds the best |
|
462 |
// target configuration (young length / scan-only prefix length) so |
|
463 |
// that GC efficiency is maximized and that we also meet a pause |
|
464 |
// time. It's a triple nested loop. These loops are explained below |
|
465 |
// from the inside-out :-) |
|
466 |
// |
|
467 |
// (a) The innermost loop will try to find the optimal young length |
|
468 |
// for a fixed S-O length. It uses a binary search to speed up the |
|
469 |
// process. We assume that, for a fixed S-O length, as we add more |
|
470 |
// young regions to the CSet, the GC efficiency will only go up (I'll |
|
471 |
// skip the proof). So, using a binary search to optimize this process |
|
472 |
// makes perfect sense. |
|
473 |
// |
|
474 |
// (b) The middle loop will fix the S-O length before calling the |
|
475 |
// innermost one. It will vary it between two parameters, increasing |
|
476 |
// it by a given increment. |
|
477 |
// |
|
478 |
// (c) The outermost loop will call the middle loop three times. |
|
479 |
// (1) The first time it will explore all possible S-O length values |
|
480 |
// from 0 to as large as it can get, using a coarse increment (to |
|
481 |
// quickly "home in" to where the optimal seems to be). |
|
482 |
// (2) The second time it will explore the values around the optimal |
|
483 |
// that was found by the first iteration using a fine increment. |
|
484 |
// (3) Once the optimal config has been determined by the second |
|
485 |
// iteration, we'll redo the calculation, but setting the S-O length |
|
486 |
// to 95% of the optimal to make sure we sample the "area" |
|
487 |
// around the optimal length to get up-to-date survival rate data |
|
488 |
// |
|
489 |
// Termination conditions for the iterations are several: the pause |
|
490 |
// time is over the limit, we do not have enough to-space, etc. |
|
491 |
||
492 |
void G1CollectorPolicy::calculate_young_list_target_config(size_t rs_lengths) { |
|
493 |
guarantee( adaptive_young_list_length(), "pre-condition" ); |
|
494 |
||
495 |
double start_time_sec = os::elapsedTime(); |
|
5033 | 496 |
size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
1374 | 497 |
min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
498 |
size_t reserve_regions = |
|
499 |
(size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); |
|
500 |
||
501 |
if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { |
|
502 |
// we are in fully-young mode and there are free regions in the heap |
|
503 |
||
2009 | 504 |
double survivor_regions_evac_time = |
505 |
predict_survivor_regions_evac_time(); |
|
506 |
||
1374 | 507 |
size_t min_so_length = 0; |
508 |
size_t max_so_length = 0; |
|
509 |
||
510 |
if (G1UseScanOnlyPrefix) { |
|
511 |
if (_all_pause_times_ms->num() < 3) { |
|
512 |
// we won't use a scan-only set at the beginning to allow the rest |
|
513 |
// of the predictors to warm up |
|
514 |
min_so_length = 0; |
|
515 |
max_so_length = 0; |
|
516 |
} else if (_cost_per_scan_only_region_ms_seq->num() < 3) { |
|
517 |
// then, we'll only set the S-O set to 1 for a little bit of time, |
|
518 |
// to get enough information on the scanning cost |
|
519 |
min_so_length = 1; |
|
520 |
max_so_length = 1; |
|
521 |
} else if (_in_marking_window || _last_full_young_gc) { |
|
522 |
// no S-O prefix during a marking phase either, as at the end |
|
523 |
// of the marking phase we'll have to use a very small young |
|
524 |
// length target to fill up the rest of the CSet with |
|
525 |
// non-young regions and, if we have lots of scan-only regions |
|
526 |
// left-over, we will not be able to add any more non-young |
|
527 |
// regions. |
|
528 |
min_so_length = 0; |
|
529 |
max_so_length = 0; |
|
530 |
} else { |
|
531 |
// this is the common case; we'll never reach the maximum, we |
|
532 |
// one of the end conditions will fire well before that |
|
533 |
// (hopefully!) |
|
534 |
min_so_length = 0; |
|
535 |
max_so_length = _free_regions_at_end_of_collection - 1; |
|
536 |
} |
|
537 |
} else { |
|
538 |
// no S-O prefix, as the switch is not set, but we still need to |
|
539 |
// do one iteration to calculate the best young target that |
|
540 |
// meets the pause time; this way we reuse the same code instead |
|
541 |
// of replicating it |
|
542 |
min_so_length = 0; |
|
543 |
max_so_length = 0; |
|
544 |
} |
|
545 |
||
546 |
double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
|
547 |
size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
|
548 |
size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
|
549 |
size_t scanned_cards; |
|
550 |
if (full_young_gcs()) |
|
551 |
scanned_cards = predict_young_card_num(adj_rs_lengths); |
|
552 |
else |
|
553 |
scanned_cards = predict_non_young_card_num(adj_rs_lengths); |
|
554 |
// calculate this once, so that we don't have to recalculate it in |
|
555 |
// the innermost loop |
|
2009 | 556 |
double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
557 |
+ survivor_regions_evac_time; |
|
1374 | 558 |
// the result |
559 |
size_t final_young_length = 0; |
|
560 |
size_t final_so_length = 0; |
|
561 |
double final_gc_eff = 0.0; |
|
562 |
// we'll also keep track of how many times we go into the inner loop |
|
563 |
// this is for profiling reasons |
|
564 |
size_t calculations = 0; |
|
565 |
||
566 |
// this determines which of the three iterations the outer loop is in |
|
567 |
typedef enum { |
|
568 |
pass_type_coarse, |
|
569 |
pass_type_fine, |
|
570 |
pass_type_final |
|
571 |
} pass_type_t; |
|
572 |
||
573 |
// range of the outer loop's iteration |
|
574 |
size_t from_so_length = min_so_length; |
|
575 |
size_t to_so_length = max_so_length; |
|
576 |
guarantee( from_so_length <= to_so_length, "invariant" ); |
|
577 |
||
578 |
// this will keep the S-O length that's found by the second |
|
579 |
// iteration of the outer loop; we'll keep it just in case the third |
|
580 |
// iteration fails to find something |
|
581 |
size_t fine_so_length = 0; |
|
582 |
||
583 |
// the increment step for the coarse (first) iteration |
|
584 |
size_t so_coarse_increments = 5; |
|
585 |
||
586 |
// the common case, we'll start with the coarse iteration |
|
587 |
pass_type_t pass = pass_type_coarse; |
|
588 |
size_t so_length_incr = so_coarse_increments; |
|
589 |
||
590 |
if (from_so_length == to_so_length) { |
|
591 |
// not point in doing the coarse iteration, we'll go directly into |
|
592 |
// the fine one (we essentially trying to find the optimal young |
|
593 |
// length for a fixed S-O length). |
|
594 |
so_length_incr = 1; |
|
595 |
pass = pass_type_final; |
|
596 |
} else if (to_so_length - from_so_length < 3 * so_coarse_increments) { |
|
597 |
// again, the range is too short so no point in foind the coarse |
|
598 |
// iteration either |
|
599 |
so_length_incr = 1; |
|
600 |
pass = pass_type_fine; |
|
601 |
} |
|
602 |
||
603 |
bool done = false; |
|
604 |
// this is the outermost loop |
|
605 |
while (!done) { |
|
2009 | 606 |
#ifdef TRACE_CALC_YOUNG_CONFIG |
1374 | 607 |
// leave this in for debugging, just in case |
608 |
gclog_or_tty->print_cr("searching between " SIZE_FORMAT " and " SIZE_FORMAT |
|
609 |
", incr " SIZE_FORMAT ", pass %s", |
|
610 |
from_so_length, to_so_length, so_length_incr, |
|
611 |
(pass == pass_type_coarse) ? "coarse" : |
|
612 |
(pass == pass_type_fine) ? "fine" : "final"); |
|
2009 | 613 |
#endif // TRACE_CALC_YOUNG_CONFIG |
1374 | 614 |
|
615 |
size_t so_length = from_so_length; |
|
616 |
size_t init_free_regions = |
|
617 |
MAX2((size_t)0, |
|
618 |
_free_regions_at_end_of_collection + |
|
619 |
_scan_only_regions_at_end_of_collection - reserve_regions); |
|
620 |
||
621 |
// this determines whether a configuration was found |
|
622 |
bool gc_eff_set = false; |
|
623 |
// this is the middle loop |
|
624 |
while (so_length <= to_so_length) { |
|
625 |
// base time, which excludes region-related time; again we |
|
626 |
// calculate it once to avoid recalculating it in the |
|
627 |
// innermost loop |
|
628 |
double base_time_with_so_ms = |
|
629 |
base_time_ms + predict_scan_only_time_ms(so_length); |
|
630 |
// it's already over the pause target, go around |
|
631 |
if (base_time_with_so_ms > target_pause_time_ms) |
|
632 |
break; |
|
633 |
||
634 |
size_t starting_young_length = so_length+1; |
|
635 |
||
636 |
// we make sure that the short young length that makes sense |
|
637 |
// (one more than the S-O length) is feasible |
|
638 |
size_t min_young_length = starting_young_length; |
|
639 |
double min_gc_eff; |
|
640 |
bool min_ok; |
|
641 |
++calculations; |
|
642 |
min_ok = predict_gc_eff(min_young_length, so_length, |
|
643 |
base_time_with_so_ms, |
|
644 |
init_free_regions, target_pause_time_ms, |
|
645 |
&min_gc_eff); |
|
646 |
||
647 |
if (min_ok) { |
|
648 |
// the shortest young length is indeed feasible; we'll know |
|
649 |
// set up the max young length and we'll do a binary search |
|
650 |
// between min_young_length and max_young_length |
|
651 |
size_t max_young_length = _free_regions_at_end_of_collection - 1; |
|
652 |
double max_gc_eff = 0.0; |
|
653 |
bool max_ok = false; |
|
654 |
||
655 |
// the innermost loop! (finally!) |
|
656 |
while (max_young_length > min_young_length) { |
|
657 |
// we'll make sure that min_young_length is always at a |
|
658 |
// feasible config |
|
659 |
guarantee( min_ok, "invariant" ); |
|
660 |
||
661 |
++calculations; |
|
662 |
max_ok = predict_gc_eff(max_young_length, so_length, |
|
663 |
base_time_with_so_ms, |
|
664 |
init_free_regions, target_pause_time_ms, |
|
665 |
&max_gc_eff); |
|
666 |
||
667 |
size_t diff = (max_young_length - min_young_length) / 2; |
|
668 |
if (max_ok) { |
|
669 |
min_young_length = max_young_length; |
|
670 |
min_gc_eff = max_gc_eff; |
|
671 |
min_ok = true; |
|
672 |
} |
|
673 |
max_young_length = min_young_length + diff; |
|
674 |
} |
|
675 |
||
676 |
// the innermost loop found a config |
|
677 |
guarantee( min_ok, "invariant" ); |
|
678 |
if (min_gc_eff > final_gc_eff) { |
|
679 |
// it's the best config so far, so we'll keep it |
|
680 |
final_gc_eff = min_gc_eff; |
|
681 |
final_young_length = min_young_length; |
|
682 |
final_so_length = so_length; |
|
683 |
gc_eff_set = true; |
|
684 |
} |
|
685 |
} |
|
686 |
||
687 |
// incremental the fixed S-O length and go around |
|
688 |
so_length += so_length_incr; |
|
689 |
} |
|
690 |
||
691 |
// this is the end of the outermost loop and we need to decide |
|
692 |
// what to do during the next iteration |
|
693 |
if (pass == pass_type_coarse) { |
|
694 |
// we just did the coarse pass (first iteration) |
|
695 |
||
696 |
if (!gc_eff_set) |
|
697 |
// we didn't find a feasible config so we'll just bail out; of |
|
698 |
// course, it might be the case that we missed it; but I'd say |
|
699 |
// it's a bit unlikely |
|
700 |
done = true; |
|
701 |
else { |
|
702 |
// We did find a feasible config with optimal GC eff during |
|
703 |
// the first pass. So the second pass we'll only consider the |
|
704 |
// S-O lengths around that config with a fine increment. |
|
705 |
||
706 |
guarantee( so_length_incr == so_coarse_increments, "invariant" ); |
|
707 |
guarantee( final_so_length >= min_so_length, "invariant" ); |
|
708 |
||
2009 | 709 |
#ifdef TRACE_CALC_YOUNG_CONFIG |
1374 | 710 |
// leave this in for debugging, just in case |
711 |
gclog_or_tty->print_cr(" coarse pass: SO length " SIZE_FORMAT, |
|
712 |
final_so_length); |
|
2009 | 713 |
#endif // TRACE_CALC_YOUNG_CONFIG |
1374 | 714 |
|
715 |
from_so_length = |
|
716 |
(final_so_length - min_so_length > so_coarse_increments) ? |
|
717 |
final_so_length - so_coarse_increments + 1 : min_so_length; |
|
718 |
to_so_length = |
|
719 |
(max_so_length - final_so_length > so_coarse_increments) ? |
|
720 |
final_so_length + so_coarse_increments - 1 : max_so_length; |
|
721 |
||
722 |
pass = pass_type_fine; |
|
723 |
so_length_incr = 1; |
|
724 |
} |
|
725 |
} else if (pass == pass_type_fine) { |
|
726 |
// we just finished the second pass |
|
727 |
||
728 |
if (!gc_eff_set) { |
|
729 |
// we didn't find a feasible config (yes, it's possible; |
|
730 |
// notice that, sometimes, we go directly into the fine |
|
731 |
// iteration and skip the coarse one) so we bail out |
|
732 |
done = true; |
|
733 |
} else { |
|
734 |
// We did find a feasible config with optimal GC eff |
|
735 |
guarantee( so_length_incr == 1, "invariant" ); |
|
736 |
||
737 |
if (final_so_length == 0) { |
|
738 |
// The config is of an empty S-O set, so we'll just bail out |
|
739 |
done = true; |
|
740 |
} else { |
|
741 |
// we'll go around once more, setting the S-O length to 95% |
|
742 |
// of the optimal |
|
743 |
size_t new_so_length = 950 * final_so_length / 1000; |
|
744 |
||
2009 | 745 |
#ifdef TRACE_CALC_YOUNG_CONFIG |
1374 | 746 |
// leave this in for debugging, just in case |
747 |
gclog_or_tty->print_cr(" fine pass: SO length " SIZE_FORMAT |
|
748 |
", setting it to " SIZE_FORMAT, |
|
749 |
final_so_length, new_so_length); |
|
2009 | 750 |
#endif // TRACE_CALC_YOUNG_CONFIG |
1374 | 751 |
|
752 |
from_so_length = new_so_length; |
|
753 |
to_so_length = new_so_length; |
|
754 |
fine_so_length = final_so_length; |
|
755 |
||
756 |
pass = pass_type_final; |
|
757 |
} |
|
758 |
} |
|
759 |
} else if (pass == pass_type_final) { |
|
760 |
// we just finished the final (third) pass |
|
761 |
||
762 |
if (!gc_eff_set) |
|
763 |
// we didn't find a feasible config, so we'll just use the one |
|
764 |
// we found during the second pass, which we saved |
|
765 |
final_so_length = fine_so_length; |
|
766 |
||
767 |
// and we're done! |
|
768 |
done = true; |
|
769 |
} else { |
|
770 |
guarantee( false, "should never reach here" ); |
|
771 |
} |
|
772 |
||
773 |
// we now go around the outermost loop |
|
774 |
} |
|
775 |
||
776 |
// we should have at least one region in the target young length |
|
2009 | 777 |
_young_list_target_length = |
778 |
MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); |
|
1374 | 779 |
if (final_so_length >= final_young_length) |
780 |
// and we need to ensure that the S-O length is not greater than |
|
781 |
// the target young length (this is being a bit careful) |
|
782 |
final_so_length = 0; |
|
783 |
_young_list_so_prefix_length = final_so_length; |
|
784 |
guarantee( !_in_marking_window || !_last_full_young_gc || |
|
785 |
_young_list_so_prefix_length == 0, "invariant" ); |
|
786 |
||
787 |
// let's keep an eye of how long we spend on this calculation |
|
788 |
// right now, I assume that we'll print it when we need it; we |
|
789 |
// should really adde it to the breakdown of a pause |
|
790 |
double end_time_sec = os::elapsedTime(); |
|
791 |
double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; |
|
792 |
||
2009 | 793 |
#ifdef TRACE_CALC_YOUNG_CONFIG |
1374 | 794 |
// leave this in for debugging, just in case |
795 |
gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT |
|
796 |
", SO = " SIZE_FORMAT ", " |
|
797 |
"elapsed %1.2lf ms, calcs: " SIZE_FORMAT " (%s%s) " |
|
798 |
SIZE_FORMAT SIZE_FORMAT, |
|
799 |
target_pause_time_ms, |
|
800 |
_young_list_target_length - _young_list_so_prefix_length, |
|
801 |
_young_list_so_prefix_length, |
|
802 |
elapsed_time_ms, |
|
803 |
calculations, |
|
804 |
full_young_gcs() ? "full" : "partial", |
|
5243
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
805 |
during_initial_mark_pause() ? " i-m" : "", |
2009 | 806 |
_in_marking_window, |
807 |
_in_marking_window_im); |
|
808 |
#endif // TRACE_CALC_YOUNG_CONFIG |
|
1374 | 809 |
|
810 |
if (_young_list_target_length < _young_list_min_length) { |
|
811 |
// bummer; this means that, if we do a pause when the optimal |
|
812 |
// config dictates, we'll violate the pause spacing target (the |
|
813 |
// min length was calculate based on the application's current |
|
814 |
// alloc rate); |
|
815 |
||
816 |
// so, we have to bite the bullet, and allocate the minimum |
|
817 |
// number. We'll violate our target, but we just can't meet it. |
|
818 |
||
819 |
size_t so_length = 0; |
|
820 |
// a note further up explains why we do not want an S-O length |
|
821 |
// during marking |
|
822 |
if (!_in_marking_window && !_last_full_young_gc) |
|
823 |
// but we can still try to see whether we can find an optimal |
|
824 |
// S-O length |
|
825 |
so_length = calculate_optimal_so_length(_young_list_min_length); |
|
826 |
||
2009 | 827 |
#ifdef TRACE_CALC_YOUNG_CONFIG |
1374 | 828 |
// leave this in for debugging, just in case |
829 |
gclog_or_tty->print_cr("adjusted target length from " |
|
830 |
SIZE_FORMAT " to " SIZE_FORMAT |
|
831 |
", SO " SIZE_FORMAT, |
|
832 |
_young_list_target_length, _young_list_min_length, |
|
833 |
so_length); |
|
2009 | 834 |
#endif // TRACE_CALC_YOUNG_CONFIG |
1374 | 835 |
|
836 |
_young_list_target_length = |
|
837 |
MAX2(_young_list_min_length, (size_t)1); |
|
838 |
_young_list_so_prefix_length = so_length; |
|
839 |
} |
|
840 |
} else { |
|
841 |
// we are in a partially-young mode or we've run out of regions (due |
|
842 |
// to evacuation failure) |
|
843 |
||
2009 | 844 |
#ifdef TRACE_CALC_YOUNG_CONFIG |
1374 | 845 |
// leave this in for debugging, just in case |
846 |
gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT |
|
847 |
", SO " SIZE_FORMAT, |
|
848 |
_young_list_min_length, 0); |
|
2009 | 849 |
#endif // TRACE_CALC_YOUNG_CONFIG |
1374 | 850 |
|
851 |
// we'll do the pause as soon as possible and with no S-O prefix |
|
852 |
// (see above for the reasons behind the latter) |
|
853 |
_young_list_target_length = |
|
854 |
MAX2(_young_list_min_length, (size_t) 1); |
|
855 |
_young_list_so_prefix_length = 0; |
|
856 |
} |
|
857 |
||
858 |
_rs_lengths_prediction = rs_lengths; |
|
859 |
} |
|
860 |
||
861 |
// This is used by: calculate_optimal_so_length(length). It returns |
|
862 |
// the GC eff and predicted pause time for a particular config |
|
863 |
void |
|
864 |
G1CollectorPolicy::predict_gc_eff(size_t young_length, |
|
865 |
size_t so_length, |
|
866 |
double base_time_ms, |
|
867 |
double* ret_gc_eff, |
|
868 |
double* ret_pause_time_ms) { |
|
869 |
double so_time_ms = predict_scan_only_time_ms(so_length); |
|
870 |
double accum_surv_rate_adj = 0.0; |
|
871 |
if (so_length > 0) |
|
872 |
accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); |
|
873 |
double accum_surv_rate = |
|
874 |
accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; |
|
875 |
size_t bytes_to_copy = |
|
876 |
(size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
|
877 |
double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
|
878 |
double young_other_time_ms = |
|
879 |
predict_young_other_time_ms(young_length - so_length); |
|
880 |
double pause_time_ms = |
|
881 |
base_time_ms + so_time_ms + copy_time_ms + young_other_time_ms; |
|
882 |
size_t reclaimed_bytes = |
|
883 |
(young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; |
|
884 |
double gc_eff = (double) reclaimed_bytes / pause_time_ms; |
|
885 |
||
886 |
*ret_gc_eff = gc_eff; |
|
887 |
*ret_pause_time_ms = pause_time_ms; |
|
888 |
} |
|
889 |
||
890 |
// This is used by: calculate_young_list_target_config(rs_length). It |
|
891 |
// returns the GC eff of a particular config. It returns false if that |
|
892 |
// config violates any of the end conditions of the search in the |
|
893 |
// calling method, or true upon success. The end conditions were put |
|
894 |
// here since it's called twice and it was best not to replicate them |
|
895 |
// in the caller. Also, passing the parameteres avoids having to |
|
896 |
// recalculate them in the innermost loop. |
|
897 |
bool |
|
898 |
G1CollectorPolicy::predict_gc_eff(size_t young_length, |
|
899 |
size_t so_length, |
|
900 |
double base_time_with_so_ms, |
|
901 |
size_t init_free_regions, |
|
902 |
double target_pause_time_ms, |
|
903 |
double* ret_gc_eff) { |
|
904 |
*ret_gc_eff = 0.0; |
|
905 |
||
906 |
if (young_length >= init_free_regions) |
|
907 |
// end condition 1: not enough space for the young regions |
|
908 |
return false; |
|
909 |
||
910 |
double accum_surv_rate_adj = 0.0; |
|
911 |
if (so_length > 0) |
|
912 |
accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); |
|
913 |
double accum_surv_rate = |
|
914 |
accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; |
|
915 |
size_t bytes_to_copy = |
|
916 |
(size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
|
917 |
double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
|
918 |
double young_other_time_ms = |
|
919 |
predict_young_other_time_ms(young_length - so_length); |
|
920 |
double pause_time_ms = |
|
921 |
base_time_with_so_ms + copy_time_ms + young_other_time_ms; |
|
922 |
||
923 |
if (pause_time_ms > target_pause_time_ms) |
|
924 |
// end condition 2: over the target pause time |
|
925 |
return false; |
|
926 |
||
927 |
size_t reclaimed_bytes = |
|
928 |
(young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; |
|
929 |
size_t free_bytes = |
|
930 |
(init_free_regions - young_length) * HeapRegion::GrainBytes; |
|
931 |
||
932 |
if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) |
|
933 |
// end condition 3: out of to-space (conservatively) |
|
934 |
return false; |
|
935 |
||
936 |
// success! |
|
937 |
double gc_eff = (double) reclaimed_bytes / pause_time_ms; |
|
938 |
*ret_gc_eff = gc_eff; |
|
939 |
||
940 |
return true; |
|
941 |
} |
|
942 |
||
2009 | 943 |
double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
944 |
double survivor_regions_evac_time = 0.0; |
|
945 |
for (HeapRegion * r = _recorded_survivor_head; |
|
946 |
r != NULL && r != _recorded_survivor_tail->get_next_young_region(); |
|
947 |
r = r->get_next_young_region()) { |
|
948 |
survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); |
|
949 |
} |
|
950 |
return survivor_regions_evac_time; |
|
951 |
} |
|
952 |
||
1374 | 953 |
void G1CollectorPolicy::check_prediction_validity() { |
954 |
guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
|
955 |
||
956 |
size_t rs_lengths = _g1->young_list_sampled_rs_lengths(); |
|
957 |
if (rs_lengths > _rs_lengths_prediction) { |
|
958 |
// add 10% to avoid having to recalculate often |
|
959 |
size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; |
|
960 |
calculate_young_list_target_config(rs_lengths_prediction); |
|
961 |
} |
|
962 |
} |
|
963 |
||
964 |
HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
|
965 |
bool is_tlab, |
|
966 |
bool* gc_overhead_limit_was_exceeded) { |
|
967 |
guarantee(false, "Not using this policy feature yet."); |
|
968 |
return NULL; |
|
969 |
} |
|
970 |
||
971 |
// This method controls how a collector handles one or more |
|
972 |
// of its generations being fully allocated. |
|
973 |
HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, |
|
974 |
bool is_tlab) { |
|
975 |
guarantee(false, "Not using this policy feature yet."); |
|
976 |
return NULL; |
|
977 |
} |
|
978 |
||
979 |
||
980 |
#ifndef PRODUCT |
|
981 |
bool G1CollectorPolicy::verify_young_ages() { |
|
982 |
HeapRegion* head = _g1->young_list_first_region(); |
|
983 |
return |
|
984 |
verify_young_ages(head, _short_lived_surv_rate_group); |
|
985 |
// also call verify_young_ages on any additional surv rate groups |
|
986 |
} |
|
987 |
||
988 |
bool |
|
989 |
G1CollectorPolicy::verify_young_ages(HeapRegion* head, |
|
990 |
SurvRateGroup *surv_rate_group) { |
|
991 |
guarantee( surv_rate_group != NULL, "pre-condition" ); |
|
992 |
||
993 |
const char* name = surv_rate_group->name(); |
|
994 |
bool ret = true; |
|
995 |
int prev_age = -1; |
|
996 |
||
997 |
for (HeapRegion* curr = head; |
|
998 |
curr != NULL; |
|
999 |
curr = curr->get_next_young_region()) { |
|
1000 |
SurvRateGroup* group = curr->surv_rate_group(); |
|
1001 |
if (group == NULL && !curr->is_survivor()) { |
|
1002 |
gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); |
|
1003 |
ret = false; |
|
1004 |
} |
|
1005 |
||
1006 |
if (surv_rate_group == group) { |
|
1007 |
int age = curr->age_in_surv_rate_group(); |
|
1008 |
||
1009 |
if (age < 0) { |
|
1010 |
gclog_or_tty->print_cr("## %s: encountered negative age", name); |
|
1011 |
ret = false; |
|
1012 |
} |
|
1013 |
||
1014 |
if (age <= prev_age) { |
|
1015 |
gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " |
|
1016 |
"(%d, %d)", name, age, prev_age); |
|
1017 |
ret = false; |
|
1018 |
} |
|
1019 |
prev_age = age; |
|
1020 |
} |
|
1021 |
} |
|
1022 |
||
1023 |
return ret; |
|
1024 |
} |
|
1025 |
#endif // PRODUCT |
|
1026 |
||
1027 |
void G1CollectorPolicy::record_full_collection_start() { |
|
1028 |
_cur_collection_start_sec = os::elapsedTime(); |
|
1029 |
// Release the future to-space so that it is available for compaction into. |
|
1030 |
_g1->set_full_collection(); |
|
1031 |
} |
|
1032 |
||
1033 |
void G1CollectorPolicy::record_full_collection_end() { |
|
1034 |
// Consider this like a collection pause for the purposes of allocation |
|
1035 |
// since last pause. |
|
1036 |
double end_sec = os::elapsedTime(); |
|
1037 |
double full_gc_time_sec = end_sec - _cur_collection_start_sec; |
|
1038 |
double full_gc_time_ms = full_gc_time_sec * 1000.0; |
|
1039 |
||
1040 |
_all_full_gc_times_ms->add(full_gc_time_ms); |
|
1041 |
||
2121
0b899b36d991
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
tonyp
parents:
2011
diff
changeset
|
1042 |
update_recent_gc_times(end_sec, full_gc_time_ms); |
1374 | 1043 |
|
1044 |
_g1->clear_full_collection(); |
|
1045 |
||
1046 |
// "Nuke" the heuristics that control the fully/partially young GC |
|
1047 |
// transitions and make sure we start with fully young GCs after the |
|
1048 |
// Full GC. |
|
1049 |
set_full_young_gcs(true); |
|
1050 |
_last_full_young_gc = false; |
|
1051 |
_should_revert_to_full_young_gcs = false; |
|
5243
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1052 |
clear_initiate_conc_mark_if_possible(); |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1053 |
clear_during_initial_mark_pause(); |
1374 | 1054 |
_known_garbage_bytes = 0; |
1055 |
_known_garbage_ratio = 0.0; |
|
1056 |
_in_marking_window = false; |
|
1057 |
_in_marking_window_im = false; |
|
1058 |
||
1059 |
_short_lived_surv_rate_group->record_scan_only_prefix(0); |
|
1060 |
_short_lived_surv_rate_group->start_adding_regions(); |
|
1061 |
// also call this on any additional surv rate groups |
|
1062 |
||
2009 | 1063 |
record_survivor_regions(0, NULL, NULL); |
1064 |
||
1374 | 1065 |
_prev_region_num_young = _region_num_young; |
1066 |
_prev_region_num_tenured = _region_num_tenured; |
|
1067 |
||
1068 |
_free_regions_at_end_of_collection = _g1->free_regions(); |
|
1069 |
_scan_only_regions_at_end_of_collection = 0; |
|
2009 | 1070 |
// Reset survivors SurvRateGroup. |
1071 |
_survivor_surv_rate_group->reset(); |
|
1374 | 1072 |
calculate_young_list_min_length(); |
1073 |
calculate_young_list_target_config(); |
|
1074 |
} |
|
1075 |
||
1076 |
void G1CollectorPolicy::record_before_bytes(size_t bytes) { |
|
1077 |
_bytes_in_to_space_before_gc += bytes; |
|
1078 |
} |
|
1079 |
||
1080 |
void G1CollectorPolicy::record_after_bytes(size_t bytes) { |
|
1081 |
_bytes_in_to_space_after_gc += bytes; |
|
1082 |
} |
|
1083 |
||
1084 |
void G1CollectorPolicy::record_stop_world_start() { |
|
1085 |
_stop_world_start = os::elapsedTime(); |
|
1086 |
} |
|
1087 |
||
1088 |
void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, |
|
1089 |
size_t start_used) { |
|
1090 |
if (PrintGCDetails) { |
|
1091 |
gclog_or_tty->stamp(PrintGCTimeStamps); |
|
1092 |
gclog_or_tty->print("[GC pause"); |
|
1093 |
if (in_young_gc_mode()) |
|
1094 |
gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); |
|
1095 |
} |
|
1096 |
||
1097 |
assert(_g1->used_regions() == _g1->recalculate_used_regions(), |
|
1098 |
"sanity"); |
|
2248 | 1099 |
assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
1374 | 1100 |
|
1101 |
double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; |
|
1102 |
_all_stop_world_times_ms->add(s_w_t_ms); |
|
1103 |
_stop_world_start = 0.0; |
|
1104 |
||
1105 |
_cur_collection_start_sec = start_time_sec; |
|
1106 |
_cur_collection_pause_used_at_start_bytes = start_used; |
|
1107 |
_cur_collection_pause_used_regions_at_start = _g1->used_regions(); |
|
1108 |
_pending_cards = _g1->pending_card_num(); |
|
1109 |
_max_pending_cards = _g1->max_pending_card_num(); |
|
1110 |
||
1111 |
_bytes_in_to_space_before_gc = 0; |
|
1112 |
_bytes_in_to_space_after_gc = 0; |
|
1113 |
_bytes_in_collection_set_before_gc = 0; |
|
1114 |
||
1115 |
#ifdef DEBUG |
|
1116 |
// initialise these to something well known so that we can spot |
|
1117 |
// if they are not set properly |
|
1118 |
||
1119 |
for (int i = 0; i < _parallel_gc_threads; ++i) { |
|
1120 |
_par_last_ext_root_scan_times_ms[i] = -666.0; |
|
1121 |
_par_last_mark_stack_scan_times_ms[i] = -666.0; |
|
1122 |
_par_last_scan_only_times_ms[i] = -666.0; |
|
1123 |
_par_last_scan_only_regions_scanned[i] = -666.0; |
|
1124 |
_par_last_update_rs_start_times_ms[i] = -666.0; |
|
1125 |
_par_last_update_rs_times_ms[i] = -666.0; |
|
1126 |
_par_last_update_rs_processed_buffers[i] = -666.0; |
|
1127 |
_par_last_scan_rs_start_times_ms[i] = -666.0; |
|
1128 |
_par_last_scan_rs_times_ms[i] = -666.0; |
|
1129 |
_par_last_scan_new_refs_times_ms[i] = -666.0; |
|
1130 |
_par_last_obj_copy_times_ms[i] = -666.0; |
|
1131 |
_par_last_termination_times_ms[i] = -666.0; |
|
1132 |
} |
|
1133 |
#endif |
|
1134 |
||
1135 |
for (int i = 0; i < _aux_num; ++i) { |
|
1136 |
_cur_aux_times_ms[i] = 0.0; |
|
1137 |
_cur_aux_times_set[i] = false; |
|
1138 |
} |
|
1139 |
||
1140 |
_satb_drain_time_set = false; |
|
1141 |
_last_satb_drain_processed_buffers = -1; |
|
1142 |
||
1143 |
if (in_young_gc_mode()) |
|
1144 |
_last_young_gc_full = false; |
|
1145 |
||
1146 |
||
1147 |
// do that for any other surv rate groups |
|
1148 |
_short_lived_surv_rate_group->stop_adding_regions(); |
|
1149 |
size_t short_lived_so_length = _young_list_so_prefix_length; |
|
1150 |
_short_lived_surv_rate_group->record_scan_only_prefix(short_lived_so_length); |
|
1151 |
tag_scan_only(short_lived_so_length); |
|
5033 | 1152 |
_survivors_age_table.clear(); |
2009 | 1153 |
|
1374 | 1154 |
assert( verify_young_ages(), "region age verification" ); |
1155 |
} |
|
1156 |
||
1157 |
void G1CollectorPolicy::tag_scan_only(size_t short_lived_scan_only_length) { |
|
1158 |
// done in a way that it can be extended for other surv rate groups too... |
|
1159 |
||
1160 |
HeapRegion* head = _g1->young_list_first_region(); |
|
1161 |
bool finished_short_lived = (short_lived_scan_only_length == 0); |
|
1162 |
||
1163 |
if (finished_short_lived) |
|
1164 |
return; |
|
1165 |
||
1166 |
for (HeapRegion* curr = head; |
|
1167 |
curr != NULL; |
|
1168 |
curr = curr->get_next_young_region()) { |
|
1169 |
SurvRateGroup* surv_rate_group = curr->surv_rate_group(); |
|
1170 |
int age = curr->age_in_surv_rate_group(); |
|
1171 |
||
1172 |
if (surv_rate_group == _short_lived_surv_rate_group) { |
|
1173 |
if ((size_t)age < short_lived_scan_only_length) |
|
1174 |
curr->set_scan_only(); |
|
1175 |
else |
|
1176 |
finished_short_lived = true; |
|
1177 |
} |
|
1178 |
||
1179 |
||
1180 |
if (finished_short_lived) |
|
1181 |
return; |
|
1182 |
} |
|
1183 |
||
1184 |
guarantee( false, "we should never reach here" ); |
|
1185 |
} |
|
1186 |
||
1187 |
void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { |
|
1188 |
_mark_closure_time_ms = mark_closure_time_ms; |
|
1189 |
} |
|
1190 |
||
1191 |
void G1CollectorPolicy::record_concurrent_mark_init_start() { |
|
1192 |
_mark_init_start_sec = os::elapsedTime(); |
|
1193 |
guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); |
|
1194 |
} |
|
1195 |
||
1196 |
void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double |
|
1197 |
mark_init_elapsed_time_ms) { |
|
1198 |
_during_marking = true; |
|
5243
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1199 |
assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1200 |
clear_during_initial_mark_pause(); |
1374 | 1201 |
_cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
1202 |
} |
|
1203 |
||
1204 |
void G1CollectorPolicy::record_concurrent_mark_init_end() { |
|
1205 |
double end_time_sec = os::elapsedTime(); |
|
1206 |
double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; |
|
1207 |
_concurrent_mark_init_times_ms->add(elapsed_time_ms); |
|
1208 |
record_concurrent_mark_init_end_pre(elapsed_time_ms); |
|
1209 |
||
1210 |
_mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); |
|
1211 |
} |
|
1212 |
||
1213 |
void G1CollectorPolicy::record_concurrent_mark_remark_start() { |
|
1214 |
_mark_remark_start_sec = os::elapsedTime(); |
|
1215 |
_during_marking = false; |
|
1216 |
} |
|
1217 |
||
1218 |
void G1CollectorPolicy::record_concurrent_mark_remark_end() { |
|
1219 |
double end_time_sec = os::elapsedTime(); |
|
1220 |
double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; |
|
1221 |
_concurrent_mark_remark_times_ms->add(elapsed_time_ms); |
|
1222 |
_cur_mark_stop_world_time_ms += elapsed_time_ms; |
|
1223 |
_prev_collection_pause_end_ms += elapsed_time_ms; |
|
1224 |
||
1225 |
_mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); |
|
1226 |
} |
|
1227 |
||
1228 |
void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { |
|
1229 |
_mark_cleanup_start_sec = os::elapsedTime(); |
|
1230 |
} |
|
1231 |
||
1232 |
void |
|
1233 |
G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, |
|
1234 |
size_t max_live_bytes) { |
|
1235 |
record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); |
|
1236 |
record_concurrent_mark_cleanup_end_work2(); |
|
1237 |
} |
|
1238 |
||
1239 |
void |
|
1240 |
G1CollectorPolicy:: |
|
1241 |
record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, |
|
1242 |
size_t max_live_bytes) { |
|
1243 |
if (_n_marks < 2) _n_marks++; |
|
1244 |
if (G1PolicyVerbose > 0) |
|
1245 |
gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " |
|
1246 |
" (of " SIZE_FORMAT " MB heap).", |
|
1247 |
max_live_bytes/M, _g1->capacity()/M); |
|
1248 |
} |
|
1249 |
||
1250 |
// The important thing about this is that it includes "os::elapsedTime". |
|
1251 |
void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { |
|
1252 |
double end_time_sec = os::elapsedTime(); |
|
1253 |
double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; |
|
1254 |
_concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); |
|
1255 |
_cur_mark_stop_world_time_ms += elapsed_time_ms; |
|
1256 |
_prev_collection_pause_end_ms += elapsed_time_ms; |
|
1257 |
||
1258 |
_mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); |
|
1259 |
||
1260 |
_num_markings++; |
|
1261 |
||
1262 |
// We did a marking, so reset the "since_last_mark" variables. |
|
1263 |
double considerConcMarkCost = 1.0; |
|
1264 |
// If there are available processors, concurrent activity is free... |
|
1265 |
if (Threads::number_of_non_daemon_threads() * 2 < |
|
1266 |
os::active_processor_count()) { |
|
1267 |
considerConcMarkCost = 0.0; |
|
1268 |
} |
|
1269 |
_n_pauses_at_mark_end = _n_pauses; |
|
1270 |
_n_marks_since_last_pause++; |
|
1271 |
} |
|
1272 |
||
1273 |
void |
|
1274 |
G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
|
1275 |
if (in_young_gc_mode()) { |
|
1276 |
_should_revert_to_full_young_gcs = false; |
|
1277 |
_last_full_young_gc = true; |
|
1278 |
_in_marking_window = false; |
|
1279 |
if (adaptive_young_list_length()) |
|
1280 |
calculate_young_list_target_config(); |
|
1281 |
} |
|
1282 |
} |
|
1283 |
||
1284 |
void G1CollectorPolicy::record_concurrent_pause() { |
|
1285 |
if (_stop_world_start > 0.0) { |
|
1286 |
double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; |
|
1287 |
_all_yield_times_ms->add(yield_ms); |
|
1288 |
} |
|
1289 |
} |
|
1290 |
||
1291 |
void G1CollectorPolicy::record_concurrent_pause_end() { |
|
1292 |
} |
|
1293 |
||
1294 |
void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { |
|
1295 |
_cur_CH_strong_roots_end_sec = os::elapsedTime(); |
|
1296 |
_cur_CH_strong_roots_dur_ms = |
|
1297 |
(_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; |
|
1298 |
} |
|
1299 |
||
1300 |
void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { |
|
1301 |
_cur_G1_strong_roots_end_sec = os::elapsedTime(); |
|
1302 |
_cur_G1_strong_roots_dur_ms = |
|
1303 |
(_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; |
|
1304 |
} |
|
1305 |
||
1306 |
template<class T> |
|
1307 |
T sum_of(T* sum_arr, int start, int n, int N) { |
|
1308 |
T sum = (T)0; |
|
1309 |
for (int i = 0; i < n; i++) { |
|
1310 |
int j = (start + i) % N; |
|
1311 |
sum += sum_arr[j]; |
|
1312 |
} |
|
1313 |
return sum; |
|
1314 |
} |
|
1315 |
||
1316 |
void G1CollectorPolicy::print_par_stats (int level, |
|
1317 |
const char* str, |
|
1318 |
double* data, |
|
1319 |
bool summary) { |
|
1320 |
double min = data[0], max = data[0]; |
|
1321 |
double total = 0.0; |
|
1322 |
int j; |
|
1323 |
for (j = 0; j < level; ++j) |
|
1324 |
gclog_or_tty->print(" "); |
|
1325 |
gclog_or_tty->print("[%s (ms):", str); |
|
1326 |
for (uint i = 0; i < ParallelGCThreads; ++i) { |
|
1327 |
double val = data[i]; |
|
1328 |
if (val < min) |
|
1329 |
min = val; |
|
1330 |
if (val > max) |
|
1331 |
max = val; |
|
1332 |
total += val; |
|
1333 |
gclog_or_tty->print(" %3.1lf", val); |
|
1334 |
} |
|
1335 |
if (summary) { |
|
1336 |
gclog_or_tty->print_cr(""); |
|
1337 |
double avg = total / (double) ParallelGCThreads; |
|
1338 |
gclog_or_tty->print(" "); |
|
1339 |
for (j = 0; j < level; ++j) |
|
1340 |
gclog_or_tty->print(" "); |
|
1341 |
gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", |
|
1342 |
avg, min, max); |
|
1343 |
} |
|
1344 |
gclog_or_tty->print_cr("]"); |
|
1345 |
} |
|
1346 |
||
1347 |
void G1CollectorPolicy::print_par_buffers (int level, |
|
1348 |
const char* str, |
|
1349 |
double* data, |
|
1350 |
bool summary) { |
|
1351 |
double min = data[0], max = data[0]; |
|
1352 |
double total = 0.0; |
|
1353 |
int j; |
|
1354 |
for (j = 0; j < level; ++j) |
|
1355 |
gclog_or_tty->print(" "); |
|
1356 |
gclog_or_tty->print("[%s :", str); |
|
1357 |
for (uint i = 0; i < ParallelGCThreads; ++i) { |
|
1358 |
double val = data[i]; |
|
1359 |
if (val < min) |
|
1360 |
min = val; |
|
1361 |
if (val > max) |
|
1362 |
max = val; |
|
1363 |
total += val; |
|
1364 |
gclog_or_tty->print(" %d", (int) val); |
|
1365 |
} |
|
1366 |
if (summary) { |
|
1367 |
gclog_or_tty->print_cr(""); |
|
1368 |
double avg = total / (double) ParallelGCThreads; |
|
1369 |
gclog_or_tty->print(" "); |
|
1370 |
for (j = 0; j < level; ++j) |
|
1371 |
gclog_or_tty->print(" "); |
|
1372 |
gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", |
|
1373 |
(int)total, (int)avg, (int)min, (int)max); |
|
1374 |
} |
|
1375 |
gclog_or_tty->print_cr("]"); |
|
1376 |
} |
|
1377 |
||
1378 |
void G1CollectorPolicy::print_stats (int level, |
|
1379 |
const char* str, |
|
1380 |
double value) { |
|
1381 |
for (int j = 0; j < level; ++j) |
|
1382 |
gclog_or_tty->print(" "); |
|
1383 |
gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); |
|
1384 |
} |
|
1385 |
||
1386 |
void G1CollectorPolicy::print_stats (int level, |
|
1387 |
const char* str, |
|
1388 |
int value) { |
|
1389 |
for (int j = 0; j < level; ++j) |
|
1390 |
gclog_or_tty->print(" "); |
|
1391 |
gclog_or_tty->print_cr("[%s: %d]", str, value); |
|
1392 |
} |
|
1393 |
||
1394 |
double G1CollectorPolicy::avg_value (double* data) { |
|
1395 |
if (ParallelGCThreads > 0) { |
|
1396 |
double ret = 0.0; |
|
1397 |
for (uint i = 0; i < ParallelGCThreads; ++i) |
|
1398 |
ret += data[i]; |
|
1399 |
return ret / (double) ParallelGCThreads; |
|
1400 |
} else { |
|
1401 |
return data[0]; |
|
1402 |
} |
|
1403 |
} |
|
1404 |
||
1405 |
double G1CollectorPolicy::max_value (double* data) { |
|
1406 |
if (ParallelGCThreads > 0) { |
|
1407 |
double ret = data[0]; |
|
1408 |
for (uint i = 1; i < ParallelGCThreads; ++i) |
|
1409 |
if (data[i] > ret) |
|
1410 |
ret = data[i]; |
|
1411 |
return ret; |
|
1412 |
} else { |
|
1413 |
return data[0]; |
|
1414 |
} |
|
1415 |
} |
|
1416 |
||
1417 |
double G1CollectorPolicy::sum_of_values (double* data) { |
|
1418 |
if (ParallelGCThreads > 0) { |
|
1419 |
double sum = 0.0; |
|
1420 |
for (uint i = 0; i < ParallelGCThreads; i++) |
|
1421 |
sum += data[i]; |
|
1422 |
return sum; |
|
1423 |
} else { |
|
1424 |
return data[0]; |
|
1425 |
} |
|
1426 |
} |
|
1427 |
||
1428 |
double G1CollectorPolicy::max_sum (double* data1, |
|
1429 |
double* data2) { |
|
1430 |
double ret = data1[0] + data2[0]; |
|
1431 |
||
1432 |
if (ParallelGCThreads > 0) { |
|
1433 |
for (uint i = 1; i < ParallelGCThreads; ++i) { |
|
1434 |
double data = data1[i] + data2[i]; |
|
1435 |
if (data > ret) |
|
1436 |
ret = data; |
|
1437 |
} |
|
1438 |
} |
|
1439 |
return ret; |
|
1440 |
} |
|
1441 |
||
1442 |
// Anything below that is considered to be zero |
|
1443 |
#define MIN_TIMER_GRANULARITY 0.0000001 |
|
1444 |
||
2344 | 1445 |
void G1CollectorPolicy::record_collection_pause_end(bool abandoned) { |
1374 | 1446 |
double end_time_sec = os::elapsedTime(); |
1447 |
double elapsed_ms = _last_pause_time_ms; |
|
1448 |
bool parallel = ParallelGCThreads > 0; |
|
1449 |
double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; |
|
1450 |
size_t rs_size = |
|
1451 |
_cur_collection_pause_used_regions_at_start - collection_set_size(); |
|
1452 |
size_t cur_used_bytes = _g1->used(); |
|
1453 |
assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); |
|
1454 |
bool last_pause_included_initial_mark = false; |
|
2121
0b899b36d991
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
tonyp
parents:
2011
diff
changeset
|
1455 |
bool update_stats = !abandoned && !_g1->evacuation_failed(); |
1374 | 1456 |
|
1457 |
#ifndef PRODUCT |
|
1458 |
if (G1YoungSurvRateVerbose) { |
|
1459 |
gclog_or_tty->print_cr(""); |
|
1460 |
_short_lived_surv_rate_group->print(); |
|
1461 |
// do that for any other surv rate groups too |
|
1462 |
} |
|
1463 |
#endif // PRODUCT |
|
1464 |
||
1465 |
if (in_young_gc_mode()) { |
|
5243
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1466 |
last_pause_included_initial_mark = during_initial_mark_pause(); |
1374 | 1467 |
if (last_pause_included_initial_mark) |
1468 |
record_concurrent_mark_init_end_pre(0.0); |
|
1469 |
||
1470 |
size_t min_used_targ = |
|
5034
a1cec6310394
6928073: G1: use existing command line parameters for marking cycle initiation
tonyp
parents:
5033
diff
changeset
|
1471 |
(_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
1374 | 1472 |
|
5243
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1473 |
|
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1474 |
if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1475 |
assert(!last_pause_included_initial_mark, "invariant"); |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1476 |
if (cur_used_bytes > min_used_targ && |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1477 |
cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1478 |
assert(!during_initial_mark_pause(), "we should not see this here"); |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1479 |
|
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1480 |
// Note: this might have already been set, if during the last |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1481 |
// pause we decided to start a cycle but at the beginning of |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1482 |
// this pause we decided to postpone it. That's OK. |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1483 |
set_initiate_conc_mark_if_possible(); |
1374 | 1484 |
} |
1485 |
} |
|
1486 |
||
1487 |
_prev_collection_pause_used_at_end_bytes = cur_used_bytes; |
|
1488 |
} |
|
1489 |
||
1490 |
_mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
|
1491 |
end_time_sec, false); |
|
1492 |
||
1493 |
guarantee(_cur_collection_pause_used_regions_at_start >= |
|
1494 |
collection_set_size(), |
|
1495 |
"Negative RS size?"); |
|
1496 |
||
1497 |
// This assert is exempted when we're doing parallel collection pauses, |
|
1498 |
// because the fragmentation caused by the parallel GC allocation buffers |
|
1499 |
// can lead to more memory being used during collection than was used |
|
1500 |
// before. Best leave this out until the fragmentation problem is fixed. |
|
1501 |
// Pauses in which evacuation failed can also lead to negative |
|
1502 |
// collections, since no space is reclaimed from a region containing an |
|
1503 |
// object whose evacuation failed. |
|
1504 |
// Further, we're now always doing parallel collection. But I'm still |
|
1505 |
// leaving this here as a placeholder for a more precise assertion later. |
|
1506 |
// (DLD, 10/05.) |
|
1507 |
assert((true || parallel) // Always using GC LABs now. |
|
1508 |
|| _g1->evacuation_failed() |
|
1509 |
|| _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, |
|
1510 |
"Negative collection"); |
|
1511 |
||
1512 |
size_t freed_bytes = |
|
1513 |
_cur_collection_pause_used_at_start_bytes - cur_used_bytes; |
|
1514 |
size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; |
|
1515 |
double survival_fraction = |
|
1516 |
(double)surviving_bytes/ |
|
1517 |
(double)_collection_set_bytes_used_before; |
|
1518 |
||
1519 |
_n_pauses++; |
|
1520 |
||
2121
0b899b36d991
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
tonyp
parents:
2011
diff
changeset
|
1521 |
if (update_stats) { |
1374 | 1522 |
_recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
1523 |
_recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); |
|
1524 |
_recent_evac_times_ms->add(evac_ms); |
|
1525 |
_recent_pause_times_ms->add(elapsed_ms); |
|
1526 |
||
1527 |
_recent_rs_sizes->add(rs_size); |
|
1528 |
||
1529 |
// We exempt parallel collection from this check because Alloc Buffer |
|
1530 |
// fragmentation can produce negative collections. Same with evac |
|
1531 |
// failure. |
|
1532 |
// Further, we're now always doing parallel collection. But I'm still |
|
1533 |
// leaving this here as a placeholder for a more precise assertion later. |
|
1534 |
// (DLD, 10/05. |
|
1535 |
assert((true || parallel) |
|
1536 |
|| _g1->evacuation_failed() |
|
1537 |
|| surviving_bytes <= _collection_set_bytes_used_before, |
|
1538 |
"Or else negative collection!"); |
|
1539 |
_recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); |
|
1540 |
_recent_CS_bytes_surviving->add(surviving_bytes); |
|
1541 |
||
1542 |
// this is where we update the allocation rate of the application |
|
1543 |
double app_time_ms = |
|
1544 |
(_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); |
|
1545 |
if (app_time_ms < MIN_TIMER_GRANULARITY) { |
|
1546 |
// This usually happens due to the timer not having the required |
|
1547 |
// granularity. Some Linuxes are the usual culprits. |
|
1548 |
// We'll just set it to something (arbitrarily) small. |
|
1549 |
app_time_ms = 1.0; |
|
1550 |
} |
|
1551 |
size_t regions_allocated = |
|
1552 |
(_region_num_young - _prev_region_num_young) + |
|
1553 |
(_region_num_tenured - _prev_region_num_tenured); |
|
1554 |
double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
|
1555 |
_alloc_rate_ms_seq->add(alloc_rate_ms); |
|
1556 |
_prev_region_num_young = _region_num_young; |
|
1557 |
_prev_region_num_tenured = _region_num_tenured; |
|
1558 |
||
1559 |
double interval_ms = |
|
1560 |
(end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; |
|
1561 |
update_recent_gc_times(end_time_sec, elapsed_ms); |
|
1562 |
_recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; |
|
4456
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1563 |
if (recent_avg_pause_time_ratio() < 0.0 || |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1564 |
(recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1565 |
#ifndef PRODUCT |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1566 |
// Dump info to allow post-facto debugging |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1567 |
gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1568 |
gclog_or_tty->print_cr("-------------------------------------------"); |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1569 |
gclog_or_tty->print_cr("Recent GC Times (ms):"); |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1570 |
_recent_gc_times_ms->dump(); |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1571 |
gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1572 |
_recent_prev_end_times_for_all_gcs_sec->dump(); |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1573 |
gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1574 |
_recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
4457
f05d2dc1c332
6902701: G1: protect debugging code related to 6898948 with a debug flag
ysr
parents:
4456
diff
changeset
|
1575 |
// In debug mode, terminate the JVM if the user wants to debug at this point. |
f05d2dc1c332
6902701: G1: protect debugging code related to 6898948 with a debug flag
ysr
parents:
4456
diff
changeset
|
1576 |
assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
f05d2dc1c332
6902701: G1: protect debugging code related to 6898948 with a debug flag
ysr
parents:
4456
diff
changeset
|
1577 |
#endif // !PRODUCT |
f05d2dc1c332
6902701: G1: protect debugging code related to 6898948 with a debug flag
ysr
parents:
4456
diff
changeset
|
1578 |
// Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
f05d2dc1c332
6902701: G1: protect debugging code related to 6898948 with a debug flag
ysr
parents:
4456
diff
changeset
|
1579 |
// CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
4456
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1580 |
if (_recent_avg_pause_time_ratio < 0.0) { |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1581 |
_recent_avg_pause_time_ratio = 0.0; |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1582 |
} else { |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1583 |
assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1584 |
_recent_avg_pause_time_ratio = 1.0; |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1585 |
} |
fa02c2ef7a70
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
4098
diff
changeset
|
1586 |
} |
1374 | 1587 |
} |
1588 |
||
1589 |
if (G1PolicyVerbose > 1) { |
|
1590 |
gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); |
|
1591 |
} |
|
1592 |
||
1593 |
PauseSummary* summary; |
|
2344 | 1594 |
if (abandoned) { |
1595 |
summary = _abandoned_summary; |
|
1596 |
} else { |
|
1597 |
summary = _summary; |
|
1374 | 1598 |
} |
1599 |
||
1600 |
double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
|
1601 |
double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
|
1602 |
double scan_only_time = avg_value(_par_last_scan_only_times_ms); |
|
1603 |
double scan_only_regions_scanned = |
|
1604 |
sum_of_values(_par_last_scan_only_regions_scanned); |
|
1605 |
double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
|
1606 |
double update_rs_processed_buffers = |
|
1607 |
sum_of_values(_par_last_update_rs_processed_buffers); |
|
1608 |
double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
|
1609 |
double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
|
1610 |
double termination_time = avg_value(_par_last_termination_times_ms); |
|
1611 |
||
2260
219013f6a311
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
2252
diff
changeset
|
1612 |
double parallel_other_time = _cur_collection_par_time_ms - |
219013f6a311
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
2252
diff
changeset
|
1613 |
(update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
219013f6a311
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
2252
diff
changeset
|
1614 |
scan_only_time + scan_rs_time + obj_copy_time + termination_time); |
2121
0b899b36d991
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
tonyp
parents:
2011
diff
changeset
|
1615 |
if (update_stats) { |
1374 | 1616 |
MainBodySummary* body_summary = summary->main_body_summary(); |
1617 |
guarantee(body_summary != NULL, "should not be null!"); |
|
1618 |
||
1619 |
if (_satb_drain_time_set) |
|
1620 |
body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); |
|
1621 |
else |
|
1622 |
body_summary->record_satb_drain_time_ms(0.0); |
|
1623 |
body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
|
1624 |
body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
|
1625 |
body_summary->record_scan_only_time_ms(scan_only_time); |
|
1626 |
body_summary->record_update_rs_time_ms(update_rs_time); |
|
1627 |
body_summary->record_scan_rs_time_ms(scan_rs_time); |
|
1628 |
body_summary->record_obj_copy_time_ms(obj_copy_time); |
|
1629 |
if (parallel) { |
|
1630 |
body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
|
1631 |
body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
|
1632 |
body_summary->record_termination_time_ms(termination_time); |
|
1633 |
body_summary->record_parallel_other_time_ms(parallel_other_time); |
|
1634 |
} |
|
1635 |
body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
|
1636 |
} |
|
1637 |
||
1638 |
if (G1PolicyVerbose > 1) { |
|
1639 |
gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" |
|
1640 |
" CH Strong: %10.6f ms (avg: %10.6f ms)\n" |
|
1641 |
" G1 Strong: %10.6f ms (avg: %10.6f ms)\n" |
|
1642 |
" Evac: %10.6f ms (avg: %10.6f ms)\n" |
|
1643 |
" ET-RS: %10.6f ms (avg: %10.6f ms)\n" |
|
1644 |
" |RS|: " SIZE_FORMAT, |
|
1645 |
elapsed_ms, recent_avg_time_for_pauses_ms(), |
|
1646 |
_cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), |
|
1647 |
_cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), |
|
1648 |
evac_ms, recent_avg_time_for_evac_ms(), |
|
1649 |
scan_rs_time, |
|
1650 |
recent_avg_time_for_pauses_ms() - |
|
1651 |
recent_avg_time_for_G1_strong_ms(), |
|
1652 |
rs_size); |
|
1653 |
||
1654 |
gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" |
|
1655 |
" At end " SIZE_FORMAT "K\n" |
|
1656 |
" garbage : " SIZE_FORMAT "K" |
|
1657 |
" of " SIZE_FORMAT "K\n" |
|
1658 |
" survival : %6.2f%% (%6.2f%% avg)", |
|
1659 |
_cur_collection_pause_used_at_start_bytes/K, |
|
1660 |
_g1->used()/K, freed_bytes/K, |
|
1661 |
_collection_set_bytes_used_before/K, |
|
1662 |
survival_fraction*100.0, |
|
1663 |
recent_avg_survival_fraction()*100.0); |
|
1664 |
gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", |
|
1665 |
recent_avg_pause_time_ratio() * 100.0); |
|
1666 |
} |
|
1667 |
||
1668 |
double other_time_ms = elapsed_ms; |
|
1669 |
||
1670 |
if (!abandoned) { |
|
1671 |
if (_satb_drain_time_set) |
|
1672 |
other_time_ms -= _cur_satb_drain_time_ms; |
|
1673 |
||
1674 |
if (parallel) |
|
1675 |
other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; |
|
1676 |
else |
|
1677 |
other_time_ms -= |
|
1678 |
update_rs_time + |
|
1679 |
ext_root_scan_time + mark_stack_scan_time + scan_only_time + |
|
1680 |
scan_rs_time + obj_copy_time; |
|
1681 |
} |
|
1682 |
||
1683 |
if (PrintGCDetails) { |
|
1684 |
gclog_or_tty->print_cr("%s%s, %1.8lf secs]", |
|
2344 | 1685 |
abandoned ? " (abandoned)" : "", |
1374 | 1686 |
(last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1687 |
elapsed_ms / 1000.0); |
|
1688 |
||
1689 |
if (!abandoned) { |
|
2344 | 1690 |
if (_satb_drain_time_set) { |
1374 | 1691 |
print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); |
2344 | 1692 |
} |
1693 |
if (_last_satb_drain_processed_buffers >= 0) { |
|
1374 | 1694 |
print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); |
2344 | 1695 |
} |
1696 |
if (parallel) { |
|
1697 |
print_stats(1, "Parallel Time", _cur_collection_par_time_ms); |
|
1698 |
print_par_stats(2, "Update RS (Start)", _par_last_update_rs_start_times_ms, false); |
|
1699 |
print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
|
2881 | 1700 |
print_par_buffers(3, "Processed Buffers", |
1701 |
_par_last_update_rs_processed_buffers, true); |
|
1374 | 1702 |
print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); |
1703 |
print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); |
|
1704 |
print_par_stats(2, "Scan-Only Scanning", _par_last_scan_only_times_ms); |
|
1705 |
print_par_buffers(3, "Scan-Only Regions", |
|
1706 |
_par_last_scan_only_regions_scanned, true); |
|
1707 |
print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
|
1708 |
print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); |
|
1709 |
print_par_stats(2, "Termination", _par_last_termination_times_ms); |
|
1710 |
print_stats(2, "Other", parallel_other_time); |
|
1711 |
print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
|
2344 | 1712 |
} else { |
1713 |
print_stats(1, "Update RS", update_rs_time); |
|
2881 | 1714 |
print_stats(2, "Processed Buffers", |
1715 |
(int)update_rs_processed_buffers); |
|
1374 | 1716 |
print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1717 |
print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); |
|
1718 |
print_stats(1, "Scan-Only Scanning", scan_only_time); |
|
1719 |
print_stats(1, "Scan RS", scan_rs_time); |
|
1720 |
print_stats(1, "Object Copying", obj_copy_time); |
|
1721 |
} |
|
1722 |
} |
|
3590
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
1723 |
#ifndef PRODUCT |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
1724 |
print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
1725 |
print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
1726 |
print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
1727 |
print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
1728 |
if (_num_cc_clears > 0) { |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
1729 |
print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
1730 |
} |
a268fa66d7fb
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
3262
diff
changeset
|
1731 |
#endif |
1374 | 1732 |
print_stats(1, "Other", other_time_ms); |
1733 |
for (int i = 0; i < _aux_num; ++i) { |
|
1734 |
if (_cur_aux_times_set[i]) { |
|
1735 |
char buffer[96]; |
|
1736 |
sprintf(buffer, "Aux%d", i); |
|
1737 |
print_stats(1, buffer, _cur_aux_times_ms[i]); |
|
1738 |
} |
|
1739 |
} |
|
1740 |
} |
|
1741 |
if (PrintGCDetails) |
|
1742 |
gclog_or_tty->print(" ["); |
|
1743 |
if (PrintGC || PrintGCDetails) |
|
1744 |
_g1->print_size_transition(gclog_or_tty, |
|
1745 |
_cur_collection_pause_used_at_start_bytes, |
|
1746 |
_g1->used(), _g1->capacity()); |
|
1747 |
if (PrintGCDetails) |
|
1748 |
gclog_or_tty->print_cr("]"); |
|
1749 |
||
1750 |
_all_pause_times_ms->add(elapsed_ms); |
|
2260
219013f6a311
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
2252
diff
changeset
|
1751 |
if (update_stats) { |
219013f6a311
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
2252
diff
changeset
|
1752 |
summary->record_total_time_ms(elapsed_ms); |
219013f6a311
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
2252
diff
changeset
|
1753 |
summary->record_other_time_ms(other_time_ms); |
219013f6a311
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
2252
diff
changeset
|
1754 |
} |
1374 | 1755 |
for (int i = 0; i < _aux_num; ++i) |
1756 |
if (_cur_aux_times_set[i]) |
|
1757 |
_all_aux_times_ms[i].add(_cur_aux_times_ms[i]); |
|
1758 |
||
1759 |
// Reset marks-between-pauses counter. |
|
1760 |
_n_marks_since_last_pause = 0; |
|
1761 |
||
1762 |
// Update the efficiency-since-mark vars. |
|
1763 |
double proc_ms = elapsed_ms * (double) _parallel_gc_threads; |
|
1764 |
if (elapsed_ms < MIN_TIMER_GRANULARITY) { |
|
1765 |
// This usually happens due to the timer not having the required |
|
1766 |
// granularity. Some Linuxes are the usual culprits. |
|
1767 |
// We'll just set it to something (arbitrarily) small. |
|
1768 |
proc_ms = 1.0; |
|
1769 |
} |
|
1770 |
double cur_efficiency = (double) freed_bytes / proc_ms; |
|
1771 |
||
1772 |
bool new_in_marking_window = _in_marking_window; |
|
1773 |
bool new_in_marking_window_im = false; |
|
5243
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
1774 |
if (during_initial_mark_pause()) { |
1374 | 1775 |
new_in_marking_window = true; |
1776 |
new_in_marking_window_im = true; |
|
1777 |
} |
|
1778 |
||
1779 |
if (in_young_gc_mode()) { |
|
1780 |
if (_last_full_young_gc) { |
|
1781 |
set_full_young_gcs(false); |
|
1782 |
_last_full_young_gc = false; |
|
1783 |
} |
|
1784 |
||
1785 |
if ( !_last_young_gc_full ) { |
|
1786 |
if ( _should_revert_to_full_young_gcs || |
|
1787 |
_known_garbage_ratio < 0.05 || |
|
1788 |
(adaptive_young_list_length() && |
|
1789 |
(get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { |
|
1790 |
set_full_young_gcs(true); |
|
1791 |
} |
|
1792 |
} |
|
1793 |
_should_revert_to_full_young_gcs = false; |
|
1794 |
||
1795 |
if (_last_young_gc_full && !_during_marking) |
|
1796 |
_young_gc_eff_seq->add(cur_efficiency); |
|
1797 |
} |
|
1798 |
||
1799 |
_short_lived_surv_rate_group->start_adding_regions(); |
|
1800 |
// do that for any other surv rate groupsx |
|
1801 |
||
1802 |
// <NEW PREDICTION> |
|
1803 |
||
2344 | 1804 |
if (update_stats) { |
1374 | 1805 |
double pause_time_ms = elapsed_ms; |
1806 |
||
1807 |
size_t diff = 0; |
|
1808 |
if (_max_pending_cards >= _pending_cards) |
|
1809 |
diff = _max_pending_cards - _pending_cards; |
|
1810 |
_pending_card_diff_seq->add((double) diff); |
|
1811 |
||
1812 |
double cost_per_card_ms = 0.0; |
|
1813 |
if (_pending_cards > 0) { |
|
1814 |
cost_per_card_ms = update_rs_time / (double) _pending_cards; |
|
1815 |
_cost_per_card_ms_seq->add(cost_per_card_ms); |
|
1816 |
} |
|
1817 |
||
1818 |
double cost_per_scan_only_region_ms = 0.0; |
|
1819 |
if (scan_only_regions_scanned > 0.0) { |
|
1820 |
cost_per_scan_only_region_ms = |
|
1821 |
scan_only_time / scan_only_regions_scanned; |
|
1822 |
if (_in_marking_window_im) |
|
1823 |
_cost_per_scan_only_region_ms_during_cm_seq->add(cost_per_scan_only_region_ms); |
|
1824 |
else |
|
1825 |
_cost_per_scan_only_region_ms_seq->add(cost_per_scan_only_region_ms); |
|
1826 |
} |
|
1827 |
||
1828 |
size_t cards_scanned = _g1->cards_scanned(); |
|
1829 |
||
1830 |
double cost_per_entry_ms = 0.0; |
|
1831 |
if (cards_scanned > 10) { |
|
1832 |
cost_per_entry_ms = scan_rs_time / (double) cards_scanned; |
|
1833 |
if (_last_young_gc_full) |
|
1834 |
_cost_per_entry_ms_seq->add(cost_per_entry_ms); |
|
1835 |
else |
|
1836 |
_partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); |
|
1837 |
} |
|
1838 |
||
1839 |
if (_max_rs_lengths > 0) { |
|
1840 |
double cards_per_entry_ratio = |
|
1841 |
(double) cards_scanned / (double) _max_rs_lengths; |
|
1842 |
if (_last_young_gc_full) |
|
1843 |
_fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); |
|
1844 |
else |
|
1845 |
_partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); |
|
1846 |
} |
|
1847 |
||
1848 |
size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
|
1849 |
if (rs_length_diff >= 0) |
|
1850 |
_rs_length_diff_seq->add((double) rs_length_diff); |
|
1851 |
||
1852 |
size_t copied_bytes = surviving_bytes; |
|
1853 |
double cost_per_byte_ms = 0.0; |
|
1854 |
if (copied_bytes > 0) { |
|
1855 |
cost_per_byte_ms = obj_copy_time / (double) copied_bytes; |
|
1856 |
if (_in_marking_window) |
|
1857 |
_cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
|
1858 |
else |
|
1859 |
_cost_per_byte_ms_seq->add(cost_per_byte_ms); |
|
1860 |
} |
|
1861 |
||
1862 |
double all_other_time_ms = pause_time_ms - |
|
1863 |
(update_rs_time + scan_only_time + scan_rs_time + obj_copy_time + |
|
1864 |
_mark_closure_time_ms + termination_time); |
|
1865 |
||
1866 |
double young_other_time_ms = 0.0; |
|
1867 |
if (_recorded_young_regions > 0) { |
|
1868 |
young_other_time_ms = |
|
1869 |
_recorded_young_cset_choice_time_ms + |
|
1870 |
_recorded_young_free_cset_time_ms; |
|
1871 |
_young_other_cost_per_region_ms_seq->add(young_other_time_ms / |
|
1872 |
(double) _recorded_young_regions); |
|
1873 |
} |
|
1874 |
double non_young_other_time_ms = 0.0; |
|
1875 |
if (_recorded_non_young_regions > 0) { |
|
1876 |
non_young_other_time_ms = |
|
1877 |
_recorded_non_young_cset_choice_time_ms + |
|
1878 |
_recorded_non_young_free_cset_time_ms; |
|
1879 |
||
1880 |
_non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / |
|
1881 |
(double) _recorded_non_young_regions); |
|
1882 |
} |
|
1883 |
||
1884 |
double constant_other_time_ms = all_other_time_ms - |
|
1885 |
(young_other_time_ms + non_young_other_time_ms); |
|
1886 |
_constant_other_time_ms_seq->add(constant_other_time_ms); |
|
1887 |
||
1888 |
double survival_ratio = 0.0; |
|
1889 |
if (_bytes_in_collection_set_before_gc > 0) { |
|
1890 |
survival_ratio = (double) bytes_in_to_space_during_gc() / |
|
1891 |
(double) _bytes_in_collection_set_before_gc; |
|
1892 |
} |
|
1893 |
||
1894 |
_pending_cards_seq->add((double) _pending_cards); |
|
1895 |
_scanned_cards_seq->add((double) cards_scanned); |
|
1896 |
_rs_lengths_seq->add((double) _max_rs_lengths); |
|
1897 |
||
1898 |
double expensive_region_limit_ms = |
|
2741 | 1899 |
(double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
1374 | 1900 |
if (expensive_region_limit_ms < 0.0) { |
1901 |
// this means that the other time was predicted to be longer than |
|
1902 |
// than the max pause time |
|
2741 | 1903 |
expensive_region_limit_ms = (double) MaxGCPauseMillis; |
1374 | 1904 |
} |
1905 |
_expensive_region_limit_ms = expensive_region_limit_ms; |
|
1906 |
||
1907 |
if (PREDICTIONS_VERBOSE) { |
|
1908 |
gclog_or_tty->print_cr(""); |
|
1909 |
gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " |
|
1910 |
"REGIONS %d %d %d %d " |
|
1911 |
"PENDING_CARDS %d %d " |
|
1912 |
"CARDS_SCANNED %d %d " |
|
1913 |
"RS_LENGTHS %d %d " |
|
1914 |
"SCAN_ONLY_SCAN %1.6lf %1.6lf " |
|
1915 |
"RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " |
|
1916 |
"SURVIVAL_RATIO %1.6lf %1.6lf " |
|
1917 |
"OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " |
|
1918 |
"OTHER_YOUNG %1.6lf %1.6lf " |
|
1919 |
"OTHER_NON_YOUNG %1.6lf %1.6lf " |
|
1920 |
"VTIME_DIFF %1.6lf TERMINATION %1.6lf " |
|
1921 |
"ELAPSED %1.6lf %1.6lf ", |
|
1922 |
_cur_collection_start_sec, |
|
1923 |
(!_last_young_gc_full) ? 2 : |
|
1924 |
(last_pause_included_initial_mark) ? 1 : 0, |
|
1925 |
_recorded_region_num, |
|
1926 |
_recorded_young_regions, |
|
1927 |
_recorded_scan_only_regions, |
|
1928 |
_recorded_non_young_regions, |
|
1929 |
_predicted_pending_cards, _pending_cards, |
|
1930 |
_predicted_cards_scanned, cards_scanned, |
|
1931 |
_predicted_rs_lengths, _max_rs_lengths, |
|
1932 |
_predicted_scan_only_scan_time_ms, scan_only_time, |
|
1933 |
_predicted_rs_update_time_ms, update_rs_time, |
|
1934 |
_predicted_rs_scan_time_ms, scan_rs_time, |
|
1935 |
_predicted_survival_ratio, survival_ratio, |
|
1936 |
_predicted_object_copy_time_ms, obj_copy_time, |
|
1937 |
_predicted_constant_other_time_ms, constant_other_time_ms, |
|
1938 |
_predicted_young_other_time_ms, young_other_time_ms, |
|
1939 |
_predicted_non_young_other_time_ms, |
|
1940 |
non_young_other_time_ms, |
|
1941 |
_vtime_diff_ms, termination_time, |
|
1942 |
_predicted_pause_time_ms, elapsed_ms); |
|
1943 |
} |
|
1944 |
||
1945 |
if (G1PolicyVerbose > 0) { |
|
1946 |
gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", |
|
1947 |
_predicted_pause_time_ms, |
|
1948 |
(_within_target) ? "within" : "outside", |
|
1949 |
elapsed_ms); |
|
1950 |
} |
|
1951 |
||
1952 |
} |
|
1953 |
||
1954 |
_in_marking_window = new_in_marking_window; |
|
1955 |
_in_marking_window_im = new_in_marking_window_im; |
|
1956 |
_free_regions_at_end_of_collection = _g1->free_regions(); |
|
1957 |
_scan_only_regions_at_end_of_collection = _g1->young_list_length(); |
|
1958 |
calculate_young_list_min_length(); |
|
1959 |
calculate_young_list_target_config(); |
|
1960 |
||
4481 | 1961 |
// Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
5033 | 1962 |
double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
4481 | 1963 |
adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
1964 |
||
1374 | 1965 |
// </NEW PREDICTION> |
1966 |
||
1967 |
_target_pause_time_ms = -1.0; |
|
1968 |
} |
|
1969 |
||
1970 |
// <NEW PREDICTION> |
|
1971 |
||
4481 | 1972 |
void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1973 |
double update_rs_processed_buffers, |
|
1974 |
double goal_ms) { |
|
1975 |
DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
|
1976 |
ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); |
|
1977 |
||
5033 | 1978 |
if (G1UseAdaptiveConcRefinement) { |
4481 | 1979 |
const int k_gy = 3, k_gr = 6; |
1980 |
const double inc_k = 1.1, dec_k = 0.9; |
|
1981 |
||
1982 |
int g = cg1r->green_zone(); |
|
1983 |
if (update_rs_time > goal_ms) { |
|
1984 |
g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. |
|
1985 |
} else { |
|
1986 |
if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { |
|
1987 |
g = (int)MAX2(g * inc_k, g + 1.0); |
|
1988 |
} |
|
1989 |
} |
|
1990 |
// Change the refinement threads params |
|
1991 |
cg1r->set_green_zone(g); |
|
1992 |
cg1r->set_yellow_zone(g * k_gy); |
|
1993 |
cg1r->set_red_zone(g * k_gr); |
|
1994 |
cg1r->reinitialize_threads(); |
|
1995 |
||
1996 |
int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); |
|
1997 |
int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, |
|
1998 |
cg1r->yellow_zone()); |
|
1999 |
// Change the barrier params |
|
2000 |
dcqs.set_process_completed_threshold(processing_threshold); |
|
2001 |
dcqs.set_max_completed_queue(cg1r->red_zone()); |
|
2002 |
} |
|
2003 |
||
2004 |
int curr_queue_size = dcqs.completed_buffers_num(); |
|
2005 |
if (curr_queue_size >= cg1r->yellow_zone()) { |
|
2006 |
dcqs.set_completed_queue_padding(curr_queue_size); |
|
2007 |
} else { |
|
2008 |
dcqs.set_completed_queue_padding(0); |
|
2009 |
} |
|
2010 |
dcqs.notify_if_necessary(); |
|
2011 |
} |
|
2012 |
||
1374 | 2013 |
double |
2014 |
G1CollectorPolicy:: |
|
2015 |
predict_young_collection_elapsed_time_ms(size_t adjustment) { |
|
2016 |
guarantee( adjustment == 0 || adjustment == 1, "invariant" ); |
|
2017 |
||
2018 |
G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
2019 |
size_t young_num = g1h->young_list_length(); |
|
2020 |
if (young_num == 0) |
|
2021 |
return 0.0; |
|
2022 |
||
2023 |
young_num += adjustment; |
|
2024 |
size_t pending_cards = predict_pending_cards(); |
|
2025 |
size_t rs_lengths = g1h->young_list_sampled_rs_lengths() + |
|
2026 |
predict_rs_length_diff(); |
|
2027 |
size_t card_num; |
|
2028 |
if (full_young_gcs()) |
|
2029 |
card_num = predict_young_card_num(rs_lengths); |
|
2030 |
else |
|
2031 |
card_num = predict_non_young_card_num(rs_lengths); |
|
2032 |
size_t young_byte_size = young_num * HeapRegion::GrainBytes; |
|
2033 |
double accum_yg_surv_rate = |
|
2034 |
_short_lived_surv_rate_group->accum_surv_rate(adjustment); |
|
2035 |
||
2036 |
size_t bytes_to_copy = |
|
2037 |
(size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); |
|
2038 |
||
2039 |
return |
|
2040 |
predict_rs_update_time_ms(pending_cards) + |
|
2041 |
predict_rs_scan_time_ms(card_num) + |
|
2042 |
predict_object_copy_time_ms(bytes_to_copy) + |
|
2043 |
predict_young_other_time_ms(young_num) + |
|
2044 |
predict_constant_other_time_ms(); |
|
2045 |
} |
|
2046 |
||
2047 |
double |
|
2048 |
G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { |
|
2049 |
size_t rs_length = predict_rs_length_diff(); |
|
2050 |
size_t card_num; |
|
2051 |
if (full_young_gcs()) |
|
2052 |
card_num = predict_young_card_num(rs_length); |
|
2053 |
else |
|
2054 |
card_num = predict_non_young_card_num(rs_length); |
|
2055 |
return predict_base_elapsed_time_ms(pending_cards, card_num); |
|
2056 |
} |
|
2057 |
||
2058 |
double |
|
2059 |
G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, |
|
2060 |
size_t scanned_cards) { |
|
2061 |
return |
|
2062 |
predict_rs_update_time_ms(pending_cards) + |
|
2063 |
predict_rs_scan_time_ms(scanned_cards) + |
|
2064 |
predict_constant_other_time_ms(); |
|
2065 |
} |
|
2066 |
||
2067 |
double |
|
2068 |
G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, |
|
2069 |
bool young) { |
|
2070 |
size_t rs_length = hr->rem_set()->occupied(); |
|
2071 |
size_t card_num; |
|
2072 |
if (full_young_gcs()) |
|
2073 |
card_num = predict_young_card_num(rs_length); |
|
2074 |
else |
|
2075 |
card_num = predict_non_young_card_num(rs_length); |
|
2076 |
size_t bytes_to_copy = predict_bytes_to_copy(hr); |
|
2077 |
||
2078 |
double region_elapsed_time_ms = |
|
2079 |
predict_rs_scan_time_ms(card_num) + |
|
2080 |
predict_object_copy_time_ms(bytes_to_copy); |
|
2081 |
||
2082 |
if (young) |
|
2083 |
region_elapsed_time_ms += predict_young_other_time_ms(1); |
|
2084 |
else |
|
2085 |
region_elapsed_time_ms += predict_non_young_other_time_ms(1); |
|
2086 |
||
2087 |
return region_elapsed_time_ms; |
|
2088 |
} |
|
2089 |
||
2090 |
size_t |
|
2091 |
G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { |
|
2092 |
size_t bytes_to_copy; |
|
2093 |
if (hr->is_marked()) |
|
2094 |
bytes_to_copy = hr->max_live_bytes(); |
|
2095 |
else { |
|
2096 |
guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, |
|
2097 |
"invariant" ); |
|
2098 |
int age = hr->age_in_surv_rate_group(); |
|
2009 | 2099 |
double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
1374 | 2100 |
bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
2101 |
} |
|
2102 |
||
2103 |
return bytes_to_copy; |
|
2104 |
} |
|
2105 |
||
2106 |
void |
|
2107 |
G1CollectorPolicy::start_recording_regions() { |
|
2108 |
_recorded_rs_lengths = 0; |
|
2109 |
_recorded_scan_only_regions = 0; |
|
2110 |
_recorded_young_regions = 0; |
|
2111 |
_recorded_non_young_regions = 0; |
|
2112 |
||
2113 |
#if PREDICTIONS_VERBOSE |
|
2114 |
_predicted_rs_lengths = 0; |
|
2115 |
_predicted_cards_scanned = 0; |
|
2116 |
||
2117 |
_recorded_marked_bytes = 0; |
|
2118 |
_recorded_young_bytes = 0; |
|
2119 |
_predicted_bytes_to_copy = 0; |
|
2120 |
#endif // PREDICTIONS_VERBOSE |
|
2121 |
} |
|
2122 |
||
2123 |
void |
|
2124 |
G1CollectorPolicy::record_cset_region(HeapRegion* hr, bool young) { |
|
2125 |
if (young) { |
|
2126 |
++_recorded_young_regions; |
|
2127 |
} else { |
|
2128 |
++_recorded_non_young_regions; |
|
2129 |
} |
|
2130 |
#if PREDICTIONS_VERBOSE |
|
2131 |
if (young) { |
|
2009 | 2132 |
_recorded_young_bytes += hr->used(); |
1374 | 2133 |
} else { |
2134 |
_recorded_marked_bytes += hr->max_live_bytes(); |
|
2135 |
} |
|
2136 |
_predicted_bytes_to_copy += predict_bytes_to_copy(hr); |
|
2137 |
#endif // PREDICTIONS_VERBOSE |
|
2138 |
||
2139 |
size_t rs_length = hr->rem_set()->occupied(); |
|
2140 |
_recorded_rs_lengths += rs_length; |
|
2141 |
} |
|
2142 |
||
2143 |
void |
|
2144 |
G1CollectorPolicy::record_scan_only_regions(size_t scan_only_length) { |
|
2145 |
_recorded_scan_only_regions = scan_only_length; |
|
2146 |
} |
|
2147 |
||
2148 |
void |
|
2149 |
G1CollectorPolicy::end_recording_regions() { |
|
2150 |
#if PREDICTIONS_VERBOSE |
|
2151 |
_predicted_pending_cards = predict_pending_cards(); |
|
2152 |
_predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); |
|
2153 |
if (full_young_gcs()) |
|
2154 |
_predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); |
|
2155 |
else |
|
2156 |
_predicted_cards_scanned += |
|
2157 |
predict_non_young_card_num(_predicted_rs_lengths); |
|
2158 |
_recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; |
|
2159 |
||
2160 |
_predicted_scan_only_scan_time_ms = |
|
2161 |
predict_scan_only_time_ms(_recorded_scan_only_regions); |
|
2162 |
_predicted_rs_update_time_ms = |
|
2163 |
predict_rs_update_time_ms(_g1->pending_card_num()); |
|
2164 |
_predicted_rs_scan_time_ms = |
|
2165 |
predict_rs_scan_time_ms(_predicted_cards_scanned); |
|
2166 |
_predicted_object_copy_time_ms = |
|
2167 |
predict_object_copy_time_ms(_predicted_bytes_to_copy); |
|
2168 |
_predicted_constant_other_time_ms = |
|
2169 |
predict_constant_other_time_ms(); |
|
2170 |
_predicted_young_other_time_ms = |
|
2171 |
predict_young_other_time_ms(_recorded_young_regions); |
|
2172 |
_predicted_non_young_other_time_ms = |
|
2173 |
predict_non_young_other_time_ms(_recorded_non_young_regions); |
|
2174 |
||
2175 |
_predicted_pause_time_ms = |
|
2176 |
_predicted_scan_only_scan_time_ms + |
|
2177 |
_predicted_rs_update_time_ms + |
|
2178 |
_predicted_rs_scan_time_ms + |
|
2179 |
_predicted_object_copy_time_ms + |
|
2180 |
_predicted_constant_other_time_ms + |
|
2181 |
_predicted_young_other_time_ms + |
|
2182 |
_predicted_non_young_other_time_ms; |
|
2183 |
#endif // PREDICTIONS_VERBOSE |
|
2184 |
} |
|
2185 |
||
2186 |
void G1CollectorPolicy::check_if_region_is_too_expensive(double |
|
2187 |
predicted_time_ms) { |
|
2188 |
// I don't think we need to do this when in young GC mode since |
|
2189 |
// marking will be initiated next time we hit the soft limit anyway... |
|
2190 |
if (predicted_time_ms > _expensive_region_limit_ms) { |
|
2191 |
if (!in_young_gc_mode()) { |
|
2192 |
set_full_young_gcs(true); |
|
5243
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2193 |
// We might want to do something different here. However, |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2194 |
// right now we don't support the non-generational G1 mode |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2195 |
// (and in fact we are planning to remove the associated code, |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2196 |
// see CR 6814390). So, let's leave it as is and this will be |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2197 |
// removed some time in the future |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2198 |
ShouldNotReachHere(); |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2199 |
set_during_initial_mark_pause(); |
1374 | 2200 |
} else |
2201 |
// no point in doing another partial one |
|
2202 |
_should_revert_to_full_young_gcs = true; |
|
2203 |
} |
|
2204 |
} |
|
2205 |
||
2206 |
// </NEW PREDICTION> |
|
2207 |
||
2208 |
||
2209 |
void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
|
2210 |
double elapsed_ms) { |
|
2211 |
_recent_gc_times_ms->add(elapsed_ms); |
|
2212 |
_recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); |
|
2213 |
_prev_collection_pause_end_ms = end_time_sec * 1000.0; |
|
2214 |
} |
|
2215 |
||
2216 |
double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { |
|
2741 | 2217 |
if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
1374 | 2218 |
else return _recent_pause_times_ms->avg(); |
2219 |
} |
|
2220 |
||
2221 |
double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { |
|
2222 |
if (_recent_CH_strong_roots_times_ms->num() == 0) |
|
2741 | 2223 |
return (double)MaxGCPauseMillis/3.0; |
1374 | 2224 |
else return _recent_CH_strong_roots_times_ms->avg(); |
2225 |
} |
|
2226 |
||
2227 |
double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { |
|
2228 |
if (_recent_G1_strong_roots_times_ms->num() == 0) |
|
2741 | 2229 |
return (double)MaxGCPauseMillis/3.0; |
1374 | 2230 |
else return _recent_G1_strong_roots_times_ms->avg(); |
2231 |
} |
|
2232 |
||
2233 |
double G1CollectorPolicy::recent_avg_time_for_evac_ms() { |
|
2741 | 2234 |
if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
1374 | 2235 |
else return _recent_evac_times_ms->avg(); |
2236 |
} |
|
2237 |
||
2238 |
int G1CollectorPolicy::number_of_recent_gcs() { |
|
2239 |
assert(_recent_CH_strong_roots_times_ms->num() == |
|
2240 |
_recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); |
|
2241 |
assert(_recent_G1_strong_roots_times_ms->num() == |
|
2242 |
_recent_evac_times_ms->num(), "Sequence out of sync"); |
|
2243 |
assert(_recent_evac_times_ms->num() == |
|
2244 |
_recent_pause_times_ms->num(), "Sequence out of sync"); |
|
2245 |
assert(_recent_pause_times_ms->num() == |
|
2246 |
_recent_CS_bytes_used_before->num(), "Sequence out of sync"); |
|
2247 |
assert(_recent_CS_bytes_used_before->num() == |
|
2248 |
_recent_CS_bytes_surviving->num(), "Sequence out of sync"); |
|
2249 |
return _recent_pause_times_ms->num(); |
|
2250 |
} |
|
2251 |
||
2252 |
double G1CollectorPolicy::recent_avg_survival_fraction() { |
|
2253 |
return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, |
|
2254 |
_recent_CS_bytes_used_before); |
|
2255 |
} |
|
2256 |
||
2257 |
double G1CollectorPolicy::last_survival_fraction() { |
|
2258 |
return last_survival_fraction_work(_recent_CS_bytes_surviving, |
|
2259 |
_recent_CS_bytes_used_before); |
|
2260 |
} |
|
2261 |
||
2262 |
double |
|
2263 |
G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, |
|
2264 |
TruncatedSeq* before) { |
|
2265 |
assert(surviving->num() == before->num(), "Sequence out of sync"); |
|
2266 |
if (before->sum() > 0.0) { |
|
2267 |
double recent_survival_rate = surviving->sum() / before->sum(); |
|
2268 |
// We exempt parallel collection from this check because Alloc Buffer |
|
2269 |
// fragmentation can produce negative collections. |
|
2270 |
// Further, we're now always doing parallel collection. But I'm still |
|
2271 |
// leaving this here as a placeholder for a more precise assertion later. |
|
2272 |
// (DLD, 10/05.) |
|
2273 |
assert((true || ParallelGCThreads > 0) || |
|
2274 |
_g1->evacuation_failed() || |
|
2275 |
recent_survival_rate <= 1.0, "Or bad frac"); |
|
2276 |
return recent_survival_rate; |
|
2277 |
} else { |
|
2278 |
return 1.0; // Be conservative. |
|
2279 |
} |
|
2280 |
} |
|
2281 |
||
2282 |
double |
|
2283 |
G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, |
|
2284 |
TruncatedSeq* before) { |
|
2285 |
assert(surviving->num() == before->num(), "Sequence out of sync"); |
|
2286 |
if (surviving->num() > 0 && before->last() > 0.0) { |
|
2287 |
double last_survival_rate = surviving->last() / before->last(); |
|
2288 |
// We exempt parallel collection from this check because Alloc Buffer |
|
2289 |
// fragmentation can produce negative collections. |
|
2290 |
// Further, we're now always doing parallel collection. But I'm still |
|
2291 |
// leaving this here as a placeholder for a more precise assertion later. |
|
2292 |
// (DLD, 10/05.) |
|
2293 |
assert((true || ParallelGCThreads > 0) || |
|
2294 |
last_survival_rate <= 1.0, "Or bad frac"); |
|
2295 |
return last_survival_rate; |
|
2296 |
} else { |
|
2297 |
return 1.0; |
|
2298 |
} |
|
2299 |
} |
|
2300 |
||
2301 |
static const int survival_min_obs = 5; |
|
2302 |
static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; |
|
2303 |
static const double min_survival_rate = 0.1; |
|
2304 |
||
2305 |
double |
|
2306 |
G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, |
|
2307 |
double latest) { |
|
2308 |
double res = avg; |
|
2309 |
if (number_of_recent_gcs() < survival_min_obs) { |
|
2310 |
res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); |
|
2311 |
} |
|
2312 |
res = MAX2(res, latest); |
|
2313 |
res = MAX2(res, min_survival_rate); |
|
2314 |
// In the parallel case, LAB fragmentation can produce "negative |
|
2315 |
// collections"; so can evac failure. Cap at 1.0 |
|
2316 |
res = MIN2(res, 1.0); |
|
2317 |
return res; |
|
2318 |
} |
|
2319 |
||
2320 |
size_t G1CollectorPolicy::expansion_amount() { |
|
5240 | 2321 |
if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
2741 | 2322 |
// We will double the existing space, or take |
2323 |
// G1ExpandByPercentOfAvailable % of the available expansion |
|
2324 |
// space, whichever is smaller, bounded below by a minimum |
|
2325 |
// expansion (unless that's all that's left.) |
|
1374 | 2326 |
const size_t min_expand_bytes = 1*M; |
2327 |
size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); |
|
2328 |
size_t committed_bytes = _g1->capacity(); |
|
2329 |
size_t uncommitted_bytes = reserved_bytes - committed_bytes; |
|
2330 |
size_t expand_bytes; |
|
2331 |
size_t expand_bytes_via_pct = |
|
2741 | 2332 |
uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
1374 | 2333 |
expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
2334 |
expand_bytes = MAX2(expand_bytes, min_expand_bytes); |
|
2335 |
expand_bytes = MIN2(expand_bytes, uncommitted_bytes); |
|
2336 |
if (G1PolicyVerbose > 1) { |
|
2337 |
gclog_or_tty->print("Decided to expand: ratio = %5.2f, " |
|
2338 |
"committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" |
|
2339 |
" Answer = %d.\n", |
|
2340 |
recent_avg_pause_time_ratio(), |
|
2341 |
byte_size_in_proper_unit(committed_bytes), |
|
2342 |
proper_unit_for_byte_size(committed_bytes), |
|
2343 |
byte_size_in_proper_unit(uncommitted_bytes), |
|
2344 |
proper_unit_for_byte_size(uncommitted_bytes), |
|
2345 |
byte_size_in_proper_unit(expand_bytes_via_pct), |
|
2346 |
proper_unit_for_byte_size(expand_bytes_via_pct), |
|
2347 |
byte_size_in_proper_unit(expand_bytes), |
|
2348 |
proper_unit_for_byte_size(expand_bytes)); |
|
2349 |
} |
|
2350 |
return expand_bytes; |
|
2351 |
} else { |
|
2352 |
return 0; |
|
2353 |
} |
|
2354 |
} |
|
2355 |
||
2356 |
void G1CollectorPolicy::note_start_of_mark_thread() { |
|
2357 |
_mark_thread_startup_sec = os::elapsedTime(); |
|
2358 |
} |
|
2359 |
||
2360 |
class CountCSClosure: public HeapRegionClosure { |
|
2361 |
G1CollectorPolicy* _g1_policy; |
|
2362 |
public: |
|
2363 |
CountCSClosure(G1CollectorPolicy* g1_policy) : |
|
2364 |
_g1_policy(g1_policy) {} |
|
2365 |
bool doHeapRegion(HeapRegion* r) { |
|
2366 |
_g1_policy->_bytes_in_collection_set_before_gc += r->used(); |
|
2367 |
return false; |
|
2368 |
} |
|
2369 |
}; |
|
2370 |
||
2371 |
void G1CollectorPolicy::count_CS_bytes_used() { |
|
2372 |
CountCSClosure cs_closure(this); |
|
2373 |
_g1->collection_set_iterate(&cs_closure); |
|
2374 |
} |
|
2375 |
||
2376 |
static void print_indent(int level) { |
|
2377 |
for (int j = 0; j < level+1; ++j) |
|
2378 |
gclog_or_tty->print(" "); |
|
2379 |
} |
|
2380 |
||
2381 |
void G1CollectorPolicy::print_summary (int level, |
|
2382 |
const char* str, |
|
2383 |
NumberSeq* seq) const { |
|
2384 |
double sum = seq->sum(); |
|
2385 |
print_indent(level); |
|
2386 |
gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
|
2387 |
str, sum / 1000.0, seq->avg()); |
|
2388 |
} |
|
2389 |
||
2390 |
void G1CollectorPolicy::print_summary_sd (int level, |
|
2391 |
const char* str, |
|
2392 |
NumberSeq* seq) const { |
|
2393 |
print_summary(level, str, seq); |
|
2394 |
print_indent(level + 5); |
|
2395 |
gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
|
2396 |
seq->num(), seq->sd(), seq->maximum()); |
|
2397 |
} |
|
2398 |
||
2399 |
void G1CollectorPolicy::check_other_times(int level, |
|
2400 |
NumberSeq* other_times_ms, |
|
2401 |
NumberSeq* calc_other_times_ms) const { |
|
2402 |
bool should_print = false; |
|
2403 |
||
2404 |
double max_sum = MAX2(fabs(other_times_ms->sum()), |
|
2405 |
fabs(calc_other_times_ms->sum())); |
|
2406 |
double min_sum = MIN2(fabs(other_times_ms->sum()), |
|
2407 |
fabs(calc_other_times_ms->sum())); |
|
2408 |
double sum_ratio = max_sum / min_sum; |
|
2409 |
if (sum_ratio > 1.1) { |
|
2410 |
should_print = true; |
|
2411 |
print_indent(level + 1); |
|
2412 |
gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
|
2413 |
} |
|
2414 |
||
2415 |
double max_avg = MAX2(fabs(other_times_ms->avg()), |
|
2416 |
fabs(calc_other_times_ms->avg())); |
|
2417 |
double min_avg = MIN2(fabs(other_times_ms->avg()), |
|
2418 |
fabs(calc_other_times_ms->avg())); |
|
2419 |
double avg_ratio = max_avg / min_avg; |
|
2420 |
if (avg_ratio > 1.1) { |
|
2421 |
should_print = true; |
|
2422 |
print_indent(level + 1); |
|
2423 |
gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
|
2424 |
} |
|
2425 |
||
2426 |
if (other_times_ms->sum() < -0.01) { |
|
2427 |
print_indent(level + 1); |
|
2428 |
gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
|
2429 |
} |
|
2430 |
||
2431 |
if (other_times_ms->avg() < -0.01) { |
|
2432 |
print_indent(level + 1); |
|
2433 |
gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
|
2434 |
} |
|
2435 |
||
2436 |
if (calc_other_times_ms->sum() < -0.01) { |
|
2437 |
should_print = true; |
|
2438 |
print_indent(level + 1); |
|
2439 |
gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
|
2440 |
} |
|
2441 |
||
2442 |
if (calc_other_times_ms->avg() < -0.01) { |
|
2443 |
should_print = true; |
|
2444 |
print_indent(level + 1); |
|
2445 |
gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
|
2446 |
} |
|
2447 |
||
2448 |
if (should_print) |
|
2449 |
print_summary(level, "Other(Calc)", calc_other_times_ms); |
|
2450 |
} |
|
2451 |
||
2452 |
void G1CollectorPolicy::print_summary(PauseSummary* summary) const { |
|
2453 |
bool parallel = ParallelGCThreads > 0; |
|
2454 |
MainBodySummary* body_summary = summary->main_body_summary(); |
|
2455 |
if (summary->get_total_seq()->num() > 0) { |
|
2344 | 2456 |
print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
1374 | 2457 |
if (body_summary != NULL) { |
2458 |
print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); |
|
2459 |
if (parallel) { |
|
2460 |
print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); |
|
2461 |
print_summary(2, "Update RS", body_summary->get_update_rs_seq()); |
|
2462 |
print_summary(2, "Ext Root Scanning", |
|
2463 |
body_summary->get_ext_root_scan_seq()); |
|
2464 |
print_summary(2, "Mark Stack Scanning", |
|
2465 |
body_summary->get_mark_stack_scan_seq()); |
|
2466 |
print_summary(2, "Scan-Only Scanning", |
|
2467 |
body_summary->get_scan_only_seq()); |
|
2468 |
print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); |
|
2469 |
print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); |
|
2470 |
print_summary(2, "Termination", body_summary->get_termination_seq()); |
|
2471 |
print_summary(2, "Other", body_summary->get_parallel_other_seq()); |
|
2472 |
{ |
|
2473 |
NumberSeq* other_parts[] = { |
|
2474 |
body_summary->get_update_rs_seq(), |
|
2475 |
body_summary->get_ext_root_scan_seq(), |
|
2476 |
body_summary->get_mark_stack_scan_seq(), |
|
2477 |
body_summary->get_scan_only_seq(), |
|
2478 |
body_summary->get_scan_rs_seq(), |
|
2479 |
body_summary->get_obj_copy_seq(), |
|
2480 |
body_summary->get_termination_seq() |
|
2481 |
}; |
|
2482 |
NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), |
|
2483 |
7, other_parts); |
|
2484 |
check_other_times(2, body_summary->get_parallel_other_seq(), |
|
2485 |
&calc_other_times_ms); |
|
2486 |
} |
|
2487 |
print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); |
|
2488 |
print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); |
|
2489 |
} else { |
|
2490 |
print_summary(1, "Update RS", body_summary->get_update_rs_seq()); |
|
2491 |
print_summary(1, "Ext Root Scanning", |
|
2492 |
body_summary->get_ext_root_scan_seq()); |
|
2493 |
print_summary(1, "Mark Stack Scanning", |
|
2494 |
body_summary->get_mark_stack_scan_seq()); |
|
2495 |
print_summary(1, "Scan-Only Scanning", |
|
2496 |
body_summary->get_scan_only_seq()); |
|
2497 |
print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); |
|
2498 |
print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); |
|
2499 |
} |
|
2500 |
} |
|
2501 |
print_summary(1, "Other", summary->get_other_seq()); |
|
2502 |
{ |
|
2503 |
NumberSeq calc_other_times_ms; |
|
2504 |
if (body_summary != NULL) { |
|
2505 |
// not abandoned |
|
2506 |
if (parallel) { |
|
2507 |
// parallel |
|
2508 |
NumberSeq* other_parts[] = { |
|
2509 |
body_summary->get_satb_drain_seq(), |
|
2510 |
body_summary->get_parallel_seq(), |
|
2511 |
body_summary->get_clear_ct_seq() |
|
2512 |
}; |
|
2344 | 2513 |
calc_other_times_ms = NumberSeq(summary->get_total_seq(), |
2514 |
3, other_parts); |
|
1374 | 2515 |
} else { |
2516 |
// serial |
|
2517 |
NumberSeq* other_parts[] = { |
|
2518 |
body_summary->get_satb_drain_seq(), |
|
2519 |
body_summary->get_update_rs_seq(), |
|
2520 |
body_summary->get_ext_root_scan_seq(), |
|
2521 |
body_summary->get_mark_stack_scan_seq(), |
|
2522 |
body_summary->get_scan_only_seq(), |
|
2523 |
body_summary->get_scan_rs_seq(), |
|
2524 |
body_summary->get_obj_copy_seq() |
|
2525 |
}; |
|
2526 |
calc_other_times_ms = NumberSeq(summary->get_total_seq(), |
|
2344 | 2527 |
7, other_parts); |
1374 | 2528 |
} |
2529 |
} else { |
|
2530 |
// abandoned |
|
2344 | 2531 |
calc_other_times_ms = NumberSeq(); |
1374 | 2532 |
} |
2533 |
check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); |
|
2534 |
} |
|
2535 |
} else { |
|
2536 |
print_indent(0); |
|
2537 |
gclog_or_tty->print_cr("none"); |
|
2538 |
} |
|
2539 |
gclog_or_tty->print_cr(""); |
|
2540 |
} |
|
2541 |
||
2542 |
void |
|
2344 | 2543 |
G1CollectorPolicy::print_abandoned_summary(PauseSummary* summary) const { |
1374 | 2544 |
bool printed = false; |
2344 | 2545 |
if (summary->get_total_seq()->num() > 0) { |
1374 | 2546 |
printed = true; |
2344 | 2547 |
print_summary(summary); |
1374 | 2548 |
} |
2549 |
if (!printed) { |
|
2550 |
print_indent(0); |
|
2551 |
gclog_or_tty->print_cr("none"); |
|
2552 |
gclog_or_tty->print_cr(""); |
|
2553 |
} |
|
2554 |
} |
|
2555 |
||
2556 |
void G1CollectorPolicy::print_tracing_info() const { |
|
2557 |
if (TraceGen0Time) { |
|
2558 |
gclog_or_tty->print_cr("ALL PAUSES"); |
|
2559 |
print_summary_sd(0, "Total", _all_pause_times_ms); |
|
2560 |
gclog_or_tty->print_cr(""); |
|
2561 |
gclog_or_tty->print_cr(""); |
|
2562 |
gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); |
|
2563 |
gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); |
|
2564 |
gclog_or_tty->print_cr(""); |
|
2565 |
||
2344 | 2566 |
gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2567 |
print_summary(_summary); |
|
1374 | 2568 |
|
2569 |
gclog_or_tty->print_cr("ABANDONED PAUSES"); |
|
2344 | 2570 |
print_abandoned_summary(_abandoned_summary); |
1374 | 2571 |
|
2572 |
gclog_or_tty->print_cr("MISC"); |
|
2573 |
print_summary_sd(0, "Stop World", _all_stop_world_times_ms); |
|
2574 |
print_summary_sd(0, "Yields", _all_yield_times_ms); |
|
2575 |
for (int i = 0; i < _aux_num; ++i) { |
|
2576 |
if (_all_aux_times_ms[i].num() > 0) { |
|
2577 |
char buffer[96]; |
|
2578 |
sprintf(buffer, "Aux%d", i); |
|
2579 |
print_summary_sd(0, buffer, &_all_aux_times_ms[i]); |
|
2580 |
} |
|
2581 |
} |
|
2582 |
||
2583 |
size_t all_region_num = _region_num_young + _region_num_tenured; |
|
2584 |
gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " |
|
2585 |
"Tenured %8d (%6.2lf%%)", |
|
2586 |
all_region_num, |
|
2587 |
_region_num_young, |
|
2588 |
(double) _region_num_young / (double) all_region_num * 100.0, |
|
2589 |
_region_num_tenured, |
|
2590 |
(double) _region_num_tenured / (double) all_region_num * 100.0); |
|
2591 |
} |
|
2592 |
if (TraceGen1Time) { |
|
2593 |
if (_all_full_gc_times_ms->num() > 0) { |
|
2594 |
gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", |
|
2595 |
_all_full_gc_times_ms->num(), |
|
2596 |
_all_full_gc_times_ms->sum() / 1000.0); |
|
2597 |
gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); |
|
2598 |
gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", |
|
2599 |
_all_full_gc_times_ms->sd(), |
|
2600 |
_all_full_gc_times_ms->maximum()); |
|
2601 |
} |
|
2602 |
} |
|
2603 |
} |
|
2604 |
||
2605 |
void G1CollectorPolicy::print_yg_surv_rate_info() const { |
|
2606 |
#ifndef PRODUCT |
|
2607 |
_short_lived_surv_rate_group->print_surv_rate_summary(); |
|
2608 |
// add this call for any other surv rate groups |
|
2609 |
#endif // PRODUCT |
|
2610 |
} |
|
2611 |
||
2612 |
bool |
|
2613 |
G1CollectorPolicy::should_add_next_region_to_young_list() { |
|
2614 |
assert(in_young_gc_mode(), "should be in young GC mode"); |
|
2615 |
bool ret; |
|
2616 |
size_t young_list_length = _g1->young_list_length(); |
|
2009 | 2617 |
size_t young_list_max_length = _young_list_target_length; |
2618 |
if (G1FixedEdenSize) { |
|
2619 |
young_list_max_length -= _max_survivor_regions; |
|
2620 |
} |
|
2621 |
if (young_list_length < young_list_max_length) { |
|
1374 | 2622 |
ret = true; |
2623 |
++_region_num_young; |
|
2624 |
} else { |
|
2625 |
ret = false; |
|
2626 |
++_region_num_tenured; |
|
2627 |
} |
|
2628 |
||
2629 |
return ret; |
|
2630 |
} |
|
2631 |
||
2632 |
#ifndef PRODUCT |
|
2633 |
// for debugging, bit of a hack... |
|
2634 |
static char* |
|
2635 |
region_num_to_mbs(int length) { |
|
2636 |
static char buffer[64]; |
|
2637 |
double bytes = (double) (length * HeapRegion::GrainBytes); |
|
2638 |
double mbs = bytes / (double) (1024 * 1024); |
|
2639 |
sprintf(buffer, "%7.2lfMB", mbs); |
|
2640 |
return buffer; |
|
2641 |
} |
|
2642 |
#endif // PRODUCT |
|
2643 |
||
2009 | 2644 |
size_t G1CollectorPolicy::max_regions(int purpose) { |
1374 | 2645 |
switch (purpose) { |
2646 |
case GCAllocForSurvived: |
|
2009 | 2647 |
return _max_survivor_regions; |
1374 | 2648 |
case GCAllocForTenured: |
2009 | 2649 |
return REGIONS_UNLIMITED; |
1374 | 2650 |
default: |
2009 | 2651 |
ShouldNotReachHere(); |
2652 |
return REGIONS_UNLIMITED; |
|
1374 | 2653 |
}; |
2654 |
} |
|
2655 |
||
2009 | 2656 |
// Calculates survivor space parameters. |
2657 |
void G1CollectorPolicy::calculate_survivors_policy() |
|
2658 |
{ |
|
2659 |
if (G1FixedSurvivorSpaceSize == 0) { |
|
2660 |
_max_survivor_regions = _young_list_target_length / SurvivorRatio; |
|
2661 |
} else { |
|
2011
d666454081dd
6802413: G1: G1FixedSurvivorSpaceSize should be converted into regions in calculate_survivors_policy()
apetrusenko
parents:
2009
diff
changeset
|
2662 |
_max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
2009 | 2663 |
} |
2664 |
||
2665 |
if (G1FixedTenuringThreshold) { |
|
2666 |
_tenuring_threshold = MaxTenuringThreshold; |
|
2667 |
} else { |
|
2668 |
_tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
|
2669 |
HeapRegion::GrainWords * _max_survivor_regions); |
|
2670 |
} |
|
2671 |
} |
|
2672 |
||
1374 | 2673 |
bool |
2674 |
G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t |
|
2675 |
word_size) { |
|
2676 |
assert(_g1->regions_accounted_for(), "Region leakage!"); |
|
2677 |
double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
|
2678 |
||
2679 |
size_t young_list_length = _g1->young_list_length(); |
|
2009 | 2680 |
size_t young_list_max_length = _young_list_target_length; |
2681 |
if (G1FixedEdenSize) { |
|
2682 |
young_list_max_length -= _max_survivor_regions; |
|
2683 |
} |
|
2684 |
bool reached_target_length = young_list_length >= young_list_max_length; |
|
1374 | 2685 |
|
2686 |
if (in_young_gc_mode()) { |
|
2687 |
if (reached_target_length) { |
|
2688 |
assert( young_list_length > 0 && _g1->young_list_length() > 0, |
|
2689 |
"invariant" ); |
|
2690 |
_target_pause_time_ms = max_pause_time_ms; |
|
2691 |
return true; |
|
2692 |
} |
|
2693 |
} else { |
|
2694 |
guarantee( false, "should not reach here" ); |
|
2695 |
} |
|
2696 |
||
2697 |
return false; |
|
2698 |
} |
|
2699 |
||
2700 |
#ifndef PRODUCT |
|
2701 |
class HRSortIndexIsOKClosure: public HeapRegionClosure { |
|
2702 |
CollectionSetChooser* _chooser; |
|
2703 |
public: |
|
2704 |
HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : |
|
2705 |
_chooser(chooser) {} |
|
2706 |
||
2707 |
bool doHeapRegion(HeapRegion* r) { |
|
2708 |
if (!r->continuesHumongous()) { |
|
2709 |
assert(_chooser->regionProperlyOrdered(r), "Ought to be."); |
|
2710 |
} |
|
2711 |
return false; |
|
2712 |
} |
|
2713 |
}; |
|
2714 |
||
2715 |
bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { |
|
2716 |
HRSortIndexIsOKClosure cl(_collectionSetChooser); |
|
2717 |
_g1->heap_region_iterate(&cl); |
|
2718 |
return true; |
|
2719 |
} |
|
2720 |
#endif |
|
2721 |
||
2722 |
void |
|
5243
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2723 |
G1CollectorPolicy::decide_on_conc_mark_initiation() { |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2724 |
// We are about to decide on whether this pause will be an |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2725 |
// initial-mark pause. |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2726 |
|
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2727 |
// First, during_initial_mark_pause() should not be already set. We |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2728 |
// will set it here if we have to. However, it should be cleared by |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2729 |
// the end of the pause (it's only set for the duration of an |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2730 |
// initial-mark pause). |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2731 |
assert(!during_initial_mark_pause(), "pre-condition"); |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2732 |
|
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2733 |
if (initiate_conc_mark_if_possible()) { |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2734 |
// We had noticed on a previous pause that the heap occupancy has |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2735 |
// gone over the initiating threshold and we should start a |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2736 |
// concurrent marking cycle. So we might initiate one. |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2737 |
|
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2738 |
bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2739 |
if (!during_cycle) { |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2740 |
// The concurrent marking thread is not "during a cycle", i.e., |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2741 |
// it has completed the last one. So we can go ahead and |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2742 |
// initiate a new cycle. |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2743 |
|
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2744 |
set_during_initial_mark_pause(); |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2745 |
|
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2746 |
// And we can now clear initiate_conc_mark_if_possible() as |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2747 |
// we've already acted on it. |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2748 |
clear_initiate_conc_mark_if_possible(); |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2749 |
} else { |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2750 |
// The concurrent marking thread is still finishing up the |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2751 |
// previous cycle. If we start one right now the two cycles |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2752 |
// overlap. In particular, the concurrent marking thread might |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2753 |
// be in the process of clearing the next marking bitmap (which |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2754 |
// we will use for the next cycle if we start one). Starting a |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2755 |
// cycle now will be bad given that parts of the marking |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2756 |
// information might get cleared by the marking thread. And we |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2757 |
// cannot wait for the marking thread to finish the cycle as it |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2758 |
// periodically yields while clearing the next marking bitmap |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2759 |
// and, if it's in a yield point, it's waiting for us to |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2760 |
// finish. So, at this point we will not start a cycle and we'll |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2761 |
// let the concurrent marking thread complete the last one. |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2762 |
} |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2763 |
} |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2764 |
} |
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2765 |
|
99e5a8f5d81f
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
5240
diff
changeset
|
2766 |
void |
1374 | 2767 |
G1CollectorPolicy_BestRegionsFirst:: |
2768 |
record_collection_pause_start(double start_time_sec, size_t start_used) { |
|
2769 |
G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); |
|
2770 |
} |
|
2771 |
||
2772 |
class NextNonCSElemFinder: public HeapRegionClosure { |
|
2773 |
HeapRegion* _res; |
|
2774 |
public: |
|
2775 |
NextNonCSElemFinder(): _res(NULL) {} |
|
2776 |
bool doHeapRegion(HeapRegion* r) { |
|
2777 |
if (!r->in_collection_set()) { |
|
2778 |
_res = r; |
|
2779 |
return true; |
|
2780 |
} else { |
|
2781 |
return false; |
|
2782 |
} |
|
2783 |
} |
|
2784 |
HeapRegion* res() { return _res; } |
|
2785 |
}; |
|
2786 |
||
2787 |
class KnownGarbageClosure: public HeapRegionClosure { |
|
2788 |
CollectionSetChooser* _hrSorted; |
|
2789 |
||
2790 |
public: |
|
2791 |
KnownGarbageClosure(CollectionSetChooser* hrSorted) : |
|
2792 |
_hrSorted(hrSorted) |
|
2793 |
{} |
|
2794 |
||
2795 |
bool doHeapRegion(HeapRegion* r) { |
|
2796 |
// We only include humongous regions in collection |
|
2797 |
// sets when concurrent mark shows that their contained object is |
|
2798 |
// unreachable. |
|
2799 |
||
2800 |
// Do we have any marking information for this region? |
|
2801 |
if (r->is_marked()) { |
|
2802 |
// We don't include humongous regions in collection |
|
2803 |
// sets because we collect them immediately at the end of a marking |
|
2804 |
// cycle. We also don't include young regions because we *must* |
|
2805 |
// include them in the next collection pause. |
|
2806 |
if (!r->isHumongous() && !r->is_young()) { |
|
2807 |
_hrSorted->addMarkedHeapRegion(r); |
|
2808 |
} |
|
2809 |
} |
|
2810 |
return false; |
|
2811 |
} |
|
2812 |
}; |
|
2813 |
||
2814 |
class ParKnownGarbageHRClosure: public HeapRegionClosure { |
|
2815 |
CollectionSetChooser* _hrSorted; |
|
2816 |
jint _marked_regions_added; |
|
2817 |
jint _chunk_size; |
|
2818 |
jint _cur_chunk_idx; |
|
2819 |
jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) |
|
2820 |
int _worker; |
|
2821 |
int _invokes; |
|
2822 |
||
2823 |
void get_new_chunk() { |
|
2824 |
_cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); |
|
2825 |
_cur_chunk_end = _cur_chunk_idx + _chunk_size; |
|
2826 |
} |
|
2827 |
void add_region(HeapRegion* r) { |
|
2828 |
if (_cur_chunk_idx == _cur_chunk_end) { |
|
2829 |
get_new_chunk(); |
|
2830 |
} |
|
2831 |
assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); |
|
2832 |
_hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); |
|
2833 |
_marked_regions_added++; |
|
2834 |
_cur_chunk_idx++; |
|
2835 |
} |
|
2836 |
||
2837 |
public: |
|
2838 |
ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, |
|
2839 |
jint chunk_size, |
|
2840 |
int worker) : |
|
2841 |
_hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), |
|
2842 |
_marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), |
|
2843 |
_invokes(0) |
|
2844 |
{} |
|
2845 |
||
2846 |
bool doHeapRegion(HeapRegion* r) { |
|
2847 |
// We only include humongous regions in collection |
|
2848 |
// sets when concurrent mark shows that their contained object is |
|
2849 |
// unreachable. |
|
2850 |
_invokes++; |
|
2851 |
||
2852 |
// Do we have any marking information for this region? |
|
2853 |
if (r->is_marked()) { |
|
2854 |
// We don't include humongous regions in collection |
|
2855 |
// sets because we collect them immediately at the end of a marking |
|
2856 |
// cycle. |
|
2857 |
// We also do not include young regions in collection sets |
|
2858 |
if (!r->isHumongous() && !r->is_young()) { |
|
2859 |
add_region(r); |
|
2860 |
} |
|
2861 |
} |
|
2862 |
return false; |
|
2863 |
} |
|
2864 |
jint marked_regions_added() { return _marked_regions_added; } |
|
2865 |
int invokes() { return _invokes; } |
|
2866 |
}; |
|
2867 |
||
2868 |
class ParKnownGarbageTask: public AbstractGangTask { |
|
2869 |
CollectionSetChooser* _hrSorted; |
|
2870 |
jint _chunk_size; |
|
2871 |
G1CollectedHeap* _g1; |
|
2872 |
public: |
|
2873 |
ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : |
|
2874 |
AbstractGangTask("ParKnownGarbageTask"), |
|
2875 |
_hrSorted(hrSorted), _chunk_size(chunk_size), |
|
2876 |
_g1(G1CollectedHeap::heap()) |
|
2877 |
{} |
|
2878 |
||
2879 |
void work(int i) { |
|
2880 |
ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); |
|
2881 |
// Back to zero for the claim value. |
|
1387 | 2882 |
_g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2883 |
HeapRegion::InitialClaimValue); |
|
1374 | 2884 |
jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2885 |
_hrSorted->incNumMarkedHeapRegions(regions_added); |
|
2886 |
if (G1PrintParCleanupStats) { |
|
2887 |
gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", |
|
2888 |
i, parKnownGarbageCl.invokes(), regions_added); |
|
2889 |
} |
|
2890 |
} |
|
2891 |
}; |
|
2892 |
||
2893 |
void |
|
2894 |
G1CollectorPolicy_BestRegionsFirst:: |
|
2895 |
record_concurrent_mark_cleanup_end(size_t freed_bytes, |
|
2896 |
size_t max_live_bytes) { |
|
2897 |
double start; |
|
2898 |
if (G1PrintParCleanupStats) start = os::elapsedTime(); |
|
2899 |
record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); |
|
2900 |
||
2901 |
_collectionSetChooser->clearMarkedHeapRegions(); |
|
2902 |
double clear_marked_end; |
|
2903 |
if (G1PrintParCleanupStats) { |
|
2904 |
clear_marked_end = os::elapsedTime(); |
|
2905 |
gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", |
|
2906 |
(clear_marked_end - start)*1000.0); |
|
2907 |
} |
|
2908 |
if (ParallelGCThreads > 0) { |
|
2909 |
const size_t OverpartitionFactor = 4; |
|
2910 |
const size_t MinChunkSize = 8; |
|
2911 |
const size_t ChunkSize = |
|
2912 |
MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
|
2913 |
MinChunkSize); |
|
2914 |
_collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
|
2915 |
ChunkSize); |
|
2916 |
ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
|
2917 |
(int) ChunkSize); |
|
2918 |
_g1->workers()->run_task(&parKnownGarbageTask); |
|
1387 | 2919 |
|
2920 |
assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
|
2921 |
"sanity check"); |
|
1374 | 2922 |
} else { |
2923 |
KnownGarbageClosure knownGarbagecl(_collectionSetChooser); |
|
2924 |
_g1->heap_region_iterate(&knownGarbagecl); |
|
2925 |
} |
|
2926 |
double known_garbage_end; |
|
2927 |
if (G1PrintParCleanupStats) { |
|
2928 |
known_garbage_end = os::elapsedTime(); |
|
2929 |
gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", |
|
2930 |
(known_garbage_end - clear_marked_end)*1000.0); |
|
2931 |
} |
|
2932 |
_collectionSetChooser->sortMarkedHeapRegions(); |
|
2933 |
double sort_end; |
|
2934 |
if (G1PrintParCleanupStats) { |
|
2935 |
sort_end = os::elapsedTime(); |
|
2936 |
gclog_or_tty->print_cr(" sorting: %8.3f ms.", |
|
2937 |
(sort_end - known_garbage_end)*1000.0); |
|
2938 |
} |
|
2939 |
||
2940 |
record_concurrent_mark_cleanup_end_work2(); |
|
2941 |
double work2_end; |
|
2942 |
if (G1PrintParCleanupStats) { |
|
2943 |
work2_end = os::elapsedTime(); |
|
2944 |
gclog_or_tty->print_cr(" work2: %8.3f ms.", |
|
2945 |
(work2_end - sort_end)*1000.0); |
|
2946 |
} |
|
2947 |
} |
|
2948 |
||
2949 |
// Add the heap region to the collection set and return the conservative |
|
2950 |
// estimate of the number of live bytes. |
|
2951 |
void G1CollectorPolicy:: |
|
2952 |
add_to_collection_set(HeapRegion* hr) { |
|
5033 | 2953 |
if (G1PrintHeapRegions) { |
5344 | 2954 |
gclog_or_tty->print_cr("added region to cset " |
2955 |
"%d:["PTR_FORMAT", "PTR_FORMAT"], " |
|
2956 |
"top "PTR_FORMAT", %s", |
|
2957 |
hr->hrs_index(), hr->bottom(), hr->end(), |
|
2958 |
hr->top(), hr->is_young() ? "YOUNG" : "NOT_YOUNG"); |
|
1374 | 2959 |
} |
2960 |
||
2961 |
if (_g1->mark_in_progress()) |
|
2962 |
_g1->concurrent_mark()->registerCSetRegion(hr); |
|
2963 |
||
2964 |
assert(!hr->in_collection_set(), |
|
2965 |
"should not already be in the CSet"); |
|
2966 |
hr->set_in_collection_set(true); |
|
2967 |
hr->set_next_in_collection_set(_collection_set); |
|
2968 |
_collection_set = hr; |
|
2969 |
_collection_set_size++; |
|
2970 |
_collection_set_bytes_used_before += hr->used(); |
|
1902 | 2971 |
_g1->register_region_with_in_cset_fast_test(hr); |
1374 | 2972 |
} |
2973 |
||
2974 |
void |
|
2975 |
G1CollectorPolicy_BestRegionsFirst:: |
|
2344 | 2976 |
choose_collection_set() { |
1374 | 2977 |
double non_young_start_time_sec; |
2978 |
start_recording_regions(); |
|
2979 |
||
4458
075a9ef4e467
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
4457
diff
changeset
|
2980 |
guarantee(_target_pause_time_ms > -1.0 |
075a9ef4e467
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
4457
diff
changeset
|
2981 |
NOT_PRODUCT(|| Universe::heap()->gc_cause() == GCCause::_scavenge_alot), |
2344 | 2982 |
"_target_pause_time_ms should have been set!"); |
4458
075a9ef4e467
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
4457
diff
changeset
|
2983 |
#ifndef PRODUCT |
075a9ef4e467
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
4457
diff
changeset
|
2984 |
if (_target_pause_time_ms <= -1.0) { |
075a9ef4e467
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
4457
diff
changeset
|
2985 |
assert(ScavengeALot && Universe::heap()->gc_cause() == GCCause::_scavenge_alot, "Error"); |
075a9ef4e467
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
4457
diff
changeset
|
2986 |
_target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
075a9ef4e467
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
4457
diff
changeset
|
2987 |
} |
075a9ef4e467
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
4457
diff
changeset
|
2988 |
#endif |
2344 | 2989 |
assert(_collection_set == NULL, "Precondition"); |
1374 | 2990 |
|
2991 |
double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); |
|
2992 |
double predicted_pause_time_ms = base_time_ms; |
|
2993 |
||
2994 |
double target_time_ms = _target_pause_time_ms; |
|
2995 |
double time_remaining_ms = target_time_ms - base_time_ms; |
|
2996 |
||
2997 |
// the 10% and 50% values are arbitrary... |
|
2998 |
if (time_remaining_ms < 0.10*target_time_ms) { |
|
2999 |
time_remaining_ms = 0.50 * target_time_ms; |
|
3000 |
_within_target = false; |
|
3001 |
} else { |
|
3002 |
_within_target = true; |
|
3003 |
} |
|
3004 |
||
3005 |
// We figure out the number of bytes available for future to-space. |
|
3006 |
// For new regions without marking information, we must assume the |
|
3007 |
// worst-case of complete survival. If we have marking information for a |
|
3008 |
// region, we can bound the amount of live data. We can add a number of |
|
3009 |
// such regions, as long as the sum of the live data bounds does not |
|
3010 |
// exceed the available evacuation space. |
|
3011 |
size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; |
|
3012 |
||
3013 |
size_t expansion_bytes = |
|
3014 |
_g1->expansion_regions() * HeapRegion::GrainBytes; |
|
3015 |
||
2344 | 3016 |
_collection_set_bytes_used_before = 0; |
3017 |
_collection_set_size = 0; |
|
1374 | 3018 |
|
3019 |
// Adjust for expansion and slop. |
|
3020 |
max_live_bytes = max_live_bytes + expansion_bytes; |
|
3021 |
||
2344 | 3022 |
assert(_g1->regions_accounted_for(), "Region leakage!"); |
1374 | 3023 |
|
3024 |
HeapRegion* hr; |
|
3025 |
if (in_young_gc_mode()) { |
|
3026 |
double young_start_time_sec = os::elapsedTime(); |
|
3027 |
||
3028 |
if (G1PolicyVerbose > 0) { |
|
3029 |
gclog_or_tty->print_cr("Adding %d young regions to the CSet", |
|
3030 |
_g1->young_list_length()); |
|
3031 |
} |
|
3032 |
_young_cset_length = 0; |
|
3033 |
_last_young_gc_full = full_young_gcs() ? true : false; |
|
3034 |
if (_last_young_gc_full) |
|
3035 |
++_full_young_pause_num; |
|
3036 |
else |
|
3037 |
++_partial_young_pause_num; |
|
3038 |
hr = _g1->pop_region_from_young_list(); |
|
3039 |
while (hr != NULL) { |
|
3040 |
||
3041 |
assert( hr->young_index_in_cset() == -1, "invariant" ); |
|
3042 |
assert( hr->age_in_surv_rate_group() != -1, "invariant" ); |
|
3043 |
hr->set_young_index_in_cset((int) _young_cset_length); |
|
3044 |
||
3045 |
++_young_cset_length; |
|
3046 |
double predicted_time_ms = predict_region_elapsed_time_ms(hr, true); |
|
3047 |
time_remaining_ms -= predicted_time_ms; |
|
3048 |
predicted_pause_time_ms += predicted_time_ms; |
|
2344 | 3049 |
assert(!hr->in_collection_set(), "invariant"); |
3050 |
add_to_collection_set(hr); |
|
3051 |
record_cset_region(hr, true); |
|
1374 | 3052 |
max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
3053 |
if (G1PolicyVerbose > 0) { |
|
3054 |
gclog_or_tty->print_cr(" Added [" PTR_FORMAT ", " PTR_FORMAT") to CS.", |
|
3055 |
hr->bottom(), hr->end()); |
|
3056 |
gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
|
3057 |
max_live_bytes/K); |
|
3058 |
} |
|
3059 |
hr = _g1->pop_region_from_young_list(); |
|
3060 |
} |
|
3061 |
||
3062 |
record_scan_only_regions(_g1->young_list_scan_only_length()); |
|
3063 |
||
3064 |
double young_end_time_sec = os::elapsedTime(); |
|
3065 |
_recorded_young_cset_choice_time_ms = |
|
3066 |
(young_end_time_sec - young_start_time_sec) * 1000.0; |
|
3067 |
||
3068 |
non_young_start_time_sec = os::elapsedTime(); |
|
3069 |
||
3070 |
if (_young_cset_length > 0 && _last_young_gc_full) { |
|
3071 |
// don't bother adding more regions... |
|
3072 |
goto choose_collection_set_end; |
|
3073 |
} |
|
3074 |
} |
|
3075 |
||
3076 |
if (!in_young_gc_mode() || !full_young_gcs()) { |
|
3077 |
bool should_continue = true; |
|
3078 |
NumberSeq seq; |
|
3079 |
double avg_prediction = 100000000000000000.0; // something very large |
|
3080 |
do { |
|
3081 |
hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, |
|
3082 |
avg_prediction); |
|
2344 | 3083 |
if (hr != NULL) { |
1374 | 3084 |
double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
3085 |
time_remaining_ms -= predicted_time_ms; |
|
3086 |
predicted_pause_time_ms += predicted_time_ms; |
|
3087 |
add_to_collection_set(hr); |
|
3088 |
record_cset_region(hr, false); |
|
3089 |
max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
|
3090 |
if (G1PolicyVerbose > 0) { |
|
3091 |
gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
|
3092 |
max_live_bytes/K); |
|
3093 |
} |
|
3094 |
seq.add(predicted_time_ms); |
|
3095 |
avg_prediction = seq.avg() + seq.sd(); |
|
3096 |
} |
|
3097 |
should_continue = |
|
3098 |
( hr != NULL) && |
|
3099 |
( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 |
|
3100 |
: _collection_set_size < _young_list_fixed_length ); |
|
3101 |
} while (should_continue); |
|
3102 |
||
3103 |
if (!adaptive_young_list_length() && |
|
3104 |
_collection_set_size < _young_list_fixed_length) |
|
3105 |
_should_revert_to_full_young_gcs = true; |
|
3106 |
} |
|
3107 |
||
3108 |
choose_collection_set_end: |
|
3109 |
count_CS_bytes_used(); |
|
3110 |
||
3111 |
end_recording_regions(); |
|
3112 |
||
3113 |
double non_young_end_time_sec = os::elapsedTime(); |
|
3114 |
_recorded_non_young_cset_choice_time_ms = |
|
3115 |
(non_young_end_time_sec - non_young_start_time_sec) * 1000.0; |
|
3116 |
} |
|
3117 |
||
3118 |
void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { |
|
3119 |
G1CollectorPolicy::record_full_collection_end(); |
|
3120 |
_collectionSetChooser->updateAfterFullCollection(); |
|
3121 |
} |
|
3122 |
||
3123 |
void G1CollectorPolicy_BestRegionsFirst:: |
|
3124 |
expand_if_possible(size_t numRegions) { |
|
3125 |
size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; |
|
3126 |
_g1->expand(expansion_bytes); |
|
3127 |
} |
|
3128 |
||
3129 |
void G1CollectorPolicy_BestRegionsFirst:: |
|
2344 | 3130 |
record_collection_pause_end(bool abandoned) { |
3131 |
G1CollectorPolicy::record_collection_pause_end(abandoned); |
|
1374 | 3132 |
assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
3133 |
} |