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annotate src/share/vm/gc_implementation/shared/adaptiveSizePolicy.hpp @ 1562:dfe27f03244a
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0 | 1 /* |
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2 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 // This class keeps statistical information and computes the | |
26 // size of the heap. | |
27 | |
28 // Forward decls | |
29 class elapsedTimer; | |
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30 class CollectorPolicy; |
0 | 31 |
32 class AdaptiveSizePolicy : public CHeapObj { | |
33 friend class GCAdaptivePolicyCounters; | |
34 friend class PSGCAdaptivePolicyCounters; | |
35 friend class CMSGCAdaptivePolicyCounters; | |
36 protected: | |
37 | |
38 enum GCPolicyKind { | |
39 _gc_adaptive_size_policy, | |
40 _gc_ps_adaptive_size_policy, | |
41 _gc_cms_adaptive_size_policy | |
42 }; | |
43 virtual GCPolicyKind kind() const { return _gc_adaptive_size_policy; } | |
44 | |
45 enum SizePolicyTrueValues { | |
46 decrease_old_gen_for_throughput_true = -7, | |
47 decrease_young_gen_for_througput_true = -6, | |
48 | |
49 increase_old_gen_for_min_pauses_true = -5, | |
50 decrease_old_gen_for_min_pauses_true = -4, | |
51 decrease_young_gen_for_maj_pauses_true = -3, | |
52 increase_young_gen_for_min_pauses_true = -2, | |
53 increase_old_gen_for_maj_pauses_true = -1, | |
54 | |
55 decrease_young_gen_for_min_pauses_true = 1, | |
56 decrease_old_gen_for_maj_pauses_true = 2, | |
57 increase_young_gen_for_maj_pauses_true = 3, | |
58 | |
59 increase_old_gen_for_throughput_true = 4, | |
60 increase_young_gen_for_througput_true = 5, | |
61 | |
62 decrease_young_gen_for_footprint_true = 6, | |
63 decrease_old_gen_for_footprint_true = 7, | |
64 decide_at_full_gc_true = 8 | |
65 }; | |
66 | |
67 // Goal for the fraction of the total time during which application | |
68 // threads run. | |
69 const double _throughput_goal; | |
70 | |
71 // Last calculated sizes, in bytes, and aligned | |
72 size_t _eden_size; // calculated eden free space in bytes | |
73 size_t _promo_size; // calculated cms gen free space in bytes | |
74 | |
75 size_t _survivor_size; // calculated survivor size in bytes | |
76 | |
77 // This is a hint for the heap: we've detected that gc times | |
78 // are taking longer than GCTimeLimit allows. | |
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79 bool _gc_overhead_limit_exceeded; |
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80 // Use for diagnostics only. If UseGCOverheadLimit is false, |
0 | 81 // this variable is still set. |
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82 bool _print_gc_overhead_limit_would_be_exceeded; |
0 | 83 // Count of consecutive GC that have exceeded the |
84 // GC time limit criterion. | |
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85 uint _gc_overhead_limit_count; |
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86 // This flag signals that GCTimeLimit is being exceeded |
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87 // but may not have done so for the required number of consequetive |
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88 // collections. |
0 | 89 |
90 // Minor collection timers used to determine both | |
91 // pause and interval times for collections. | |
92 static elapsedTimer _minor_timer; | |
93 | |
94 // Major collection timers, used to determine both | |
95 // pause and interval times for collections | |
96 static elapsedTimer _major_timer; | |
97 | |
98 // Time statistics | |
99 AdaptivePaddedAverage* _avg_minor_pause; | |
100 AdaptiveWeightedAverage* _avg_minor_interval; | |
101 AdaptiveWeightedAverage* _avg_minor_gc_cost; | |
102 | |
103 AdaptiveWeightedAverage* _avg_major_interval; | |
104 AdaptiveWeightedAverage* _avg_major_gc_cost; | |
105 | |
106 // Footprint statistics | |
107 AdaptiveWeightedAverage* _avg_young_live; | |
108 AdaptiveWeightedAverage* _avg_eden_live; | |
109 AdaptiveWeightedAverage* _avg_old_live; | |
110 | |
111 // Statistics for survivor space calculation for young generation | |
112 AdaptivePaddedAverage* _avg_survived; | |
113 | |
114 // Objects that have been directly allocated in the old generation. | |
115 AdaptivePaddedNoZeroDevAverage* _avg_pretenured; | |
116 | |
117 // Variable for estimating the major and minor pause times. | |
118 // These variables represent linear least-squares fits of | |
119 // the data. | |
120 // minor pause time vs. old gen size | |
121 LinearLeastSquareFit* _minor_pause_old_estimator; | |
122 // minor pause time vs. young gen size | |
123 LinearLeastSquareFit* _minor_pause_young_estimator; | |
124 | |
125 // Variables for estimating the major and minor collection costs | |
126 // minor collection time vs. young gen size | |
127 LinearLeastSquareFit* _minor_collection_estimator; | |
128 // major collection time vs. cms gen size | |
129 LinearLeastSquareFit* _major_collection_estimator; | |
130 | |
131 // These record the most recent collection times. They | |
132 // are available as an alternative to using the averages | |
133 // for making ergonomic decisions. | |
134 double _latest_minor_mutator_interval_seconds; | |
135 | |
136 // Allowed difference between major and minor gc times, used | |
137 // for computing tenuring_threshold. | |
138 const double _threshold_tolerance_percent; | |
139 | |
140 const double _gc_pause_goal_sec; // goal for maximum gc pause | |
141 | |
142 // Flag indicating that the adaptive policy is ready to use | |
143 bool _young_gen_policy_is_ready; | |
144 | |
145 // decrease/increase the young generation for minor pause time | |
146 int _change_young_gen_for_min_pauses; | |
147 | |
148 // decrease/increase the old generation for major pause time | |
149 int _change_old_gen_for_maj_pauses; | |
150 | |
151 // change old geneneration for throughput | |
152 int _change_old_gen_for_throughput; | |
153 | |
154 // change young generation for throughput | |
155 int _change_young_gen_for_throughput; | |
156 | |
157 // Flag indicating that the policy would | |
158 // increase the tenuring threshold because of the total major gc cost | |
159 // is greater than the total minor gc cost | |
160 bool _increment_tenuring_threshold_for_gc_cost; | |
161 // decrease the tenuring threshold because of the the total minor gc | |
162 // cost is greater than the total major gc cost | |
163 bool _decrement_tenuring_threshold_for_gc_cost; | |
164 // decrease due to survivor size limit | |
165 bool _decrement_tenuring_threshold_for_survivor_limit; | |
166 | |
167 // decrease generation sizes for footprint | |
168 int _decrease_for_footprint; | |
169 | |
170 // Set if the ergonomic decisions were made at a full GC. | |
171 int _decide_at_full_gc; | |
172 | |
173 // Changing the generation sizing depends on the data that is | |
174 // gathered about the effects of changes on the pause times and | |
175 // throughput. These variable count the number of data points | |
176 // gathered. The policy may use these counters as a threshhold | |
177 // for reliable data. | |
178 julong _young_gen_change_for_minor_throughput; | |
179 julong _old_gen_change_for_major_throughput; | |
180 | |
181 // Accessors | |
182 | |
183 double gc_pause_goal_sec() const { return _gc_pause_goal_sec; } | |
184 // The value returned is unitless: it's the proportion of time | |
185 // spent in a particular collection type. | |
186 // An interval time will be 0.0 if a collection type hasn't occurred yet. | |
187 // The 1.4.2 implementation put a floor on the values of major_gc_cost | |
188 // and minor_gc_cost. This was useful because of the way major_gc_cost | |
189 // and minor_gc_cost was used in calculating the sizes of the generations. | |
190 // Do not use a floor in this implementation because any finite value | |
191 // will put a limit on the throughput that can be achieved and any | |
192 // throughput goal above that limit will drive the generations sizes | |
193 // to extremes. | |
194 double major_gc_cost() const { | |
195 return MAX2(0.0F, _avg_major_gc_cost->average()); | |
196 } | |
197 | |
198 // The value returned is unitless: it's the proportion of time | |
199 // spent in a particular collection type. | |
200 // An interval time will be 0.0 if a collection type hasn't occurred yet. | |
201 // The 1.4.2 implementation put a floor on the values of major_gc_cost | |
202 // and minor_gc_cost. This was useful because of the way major_gc_cost | |
203 // and minor_gc_cost was used in calculating the sizes of the generations. | |
204 // Do not use a floor in this implementation because any finite value | |
205 // will put a limit on the throughput that can be achieved and any | |
206 // throughput goal above that limit will drive the generations sizes | |
207 // to extremes. | |
208 | |
209 double minor_gc_cost() const { | |
210 return MAX2(0.0F, _avg_minor_gc_cost->average()); | |
211 } | |
212 | |
213 // Because we're dealing with averages, gc_cost() can be | |
214 // larger than 1.0 if just the sum of the minor cost the | |
215 // the major cost is used. Worse than that is the | |
216 // fact that the minor cost and the major cost each | |
217 // tend toward 1.0 in the extreme of high gc costs. | |
218 // Limit the value of gc_cost to 1.0 so that the mutator | |
219 // cost stays non-negative. | |
220 virtual double gc_cost() const { | |
221 double result = MIN2(1.0, minor_gc_cost() + major_gc_cost()); | |
222 assert(result >= 0.0, "Both minor and major costs are non-negative"); | |
223 return result; | |
224 } | |
225 | |
226 // Elapsed time since the last major collection. | |
227 virtual double time_since_major_gc() const; | |
228 | |
229 // Average interval between major collections to be used | |
230 // in calculating the decaying major gc cost. An overestimate | |
231 // of this time would be a conservative estimate because | |
232 // this time is used to decide if the major GC cost | |
233 // should be decayed (i.e., if the time since the last | |
234 // major gc is long compared to the time returned here, | |
235 // then the major GC cost will be decayed). See the | |
236 // implementations for the specifics. | |
237 virtual double major_gc_interval_average_for_decay() const { | |
238 return _avg_major_interval->average(); | |
239 } | |
240 | |
241 // Return the cost of the GC where the major gc cost | |
242 // has been decayed based on the time since the last | |
243 // major collection. | |
244 double decaying_gc_cost() const; | |
245 | |
246 // Decay the major gc cost. Use this only for decisions on | |
247 // whether to adjust, not to determine by how much to adjust. | |
248 // This approximation is crude and may not be good enough for the | |
249 // latter. | |
250 double decaying_major_gc_cost() const; | |
251 | |
252 // Return the mutator cost using the decayed | |
253 // GC cost. | |
254 double adjusted_mutator_cost() const { | |
255 double result = 1.0 - decaying_gc_cost(); | |
256 assert(result >= 0.0, "adjusted mutator cost calculation is incorrect"); | |
257 return result; | |
258 } | |
259 | |
260 virtual double mutator_cost() const { | |
261 double result = 1.0 - gc_cost(); | |
262 assert(result >= 0.0, "mutator cost calculation is incorrect"); | |
263 return result; | |
264 } | |
265 | |
266 | |
267 bool young_gen_policy_is_ready() { return _young_gen_policy_is_ready; } | |
268 | |
269 void update_minor_pause_young_estimator(double minor_pause_in_ms); | |
270 virtual void update_minor_pause_old_estimator(double minor_pause_in_ms) { | |
271 // This is not meaningful for all policies but needs to be present | |
272 // to use minor_collection_end() in its current form. | |
273 } | |
274 | |
275 virtual size_t eden_increment(size_t cur_eden); | |
276 virtual size_t eden_increment(size_t cur_eden, uint percent_change); | |
277 virtual size_t eden_decrement(size_t cur_eden); | |
278 virtual size_t promo_increment(size_t cur_eden); | |
279 virtual size_t promo_increment(size_t cur_eden, uint percent_change); | |
280 virtual size_t promo_decrement(size_t cur_eden); | |
281 | |
282 virtual void clear_generation_free_space_flags(); | |
283 | |
284 int change_old_gen_for_throughput() const { | |
285 return _change_old_gen_for_throughput; | |
286 } | |
287 void set_change_old_gen_for_throughput(int v) { | |
288 _change_old_gen_for_throughput = v; | |
289 } | |
290 int change_young_gen_for_throughput() const { | |
291 return _change_young_gen_for_throughput; | |
292 } | |
293 void set_change_young_gen_for_throughput(int v) { | |
294 _change_young_gen_for_throughput = v; | |
295 } | |
296 | |
297 int change_old_gen_for_maj_pauses() const { | |
298 return _change_old_gen_for_maj_pauses; | |
299 } | |
300 void set_change_old_gen_for_maj_pauses(int v) { | |
301 _change_old_gen_for_maj_pauses = v; | |
302 } | |
303 | |
304 bool decrement_tenuring_threshold_for_gc_cost() const { | |
305 return _decrement_tenuring_threshold_for_gc_cost; | |
306 } | |
307 void set_decrement_tenuring_threshold_for_gc_cost(bool v) { | |
308 _decrement_tenuring_threshold_for_gc_cost = v; | |
309 } | |
310 bool increment_tenuring_threshold_for_gc_cost() const { | |
311 return _increment_tenuring_threshold_for_gc_cost; | |
312 } | |
313 void set_increment_tenuring_threshold_for_gc_cost(bool v) { | |
314 _increment_tenuring_threshold_for_gc_cost = v; | |
315 } | |
316 bool decrement_tenuring_threshold_for_survivor_limit() const { | |
317 return _decrement_tenuring_threshold_for_survivor_limit; | |
318 } | |
319 void set_decrement_tenuring_threshold_for_survivor_limit(bool v) { | |
320 _decrement_tenuring_threshold_for_survivor_limit = v; | |
321 } | |
322 // Return true if the policy suggested a change. | |
323 bool tenuring_threshold_change() const; | |
324 | |
325 public: | |
326 AdaptiveSizePolicy(size_t init_eden_size, | |
327 size_t init_promo_size, | |
328 size_t init_survivor_size, | |
329 double gc_pause_goal_sec, | |
330 uint gc_cost_ratio); | |
331 | |
332 bool is_gc_cms_adaptive_size_policy() { | |
333 return kind() == _gc_cms_adaptive_size_policy; | |
334 } | |
335 bool is_gc_ps_adaptive_size_policy() { | |
336 return kind() == _gc_ps_adaptive_size_policy; | |
337 } | |
338 | |
339 AdaptivePaddedAverage* avg_minor_pause() const { return _avg_minor_pause; } | |
340 AdaptiveWeightedAverage* avg_minor_interval() const { | |
341 return _avg_minor_interval; | |
342 } | |
343 AdaptiveWeightedAverage* avg_minor_gc_cost() const { | |
344 return _avg_minor_gc_cost; | |
345 } | |
346 | |
347 AdaptiveWeightedAverage* avg_major_gc_cost() const { | |
348 return _avg_major_gc_cost; | |
349 } | |
350 | |
351 AdaptiveWeightedAverage* avg_young_live() const { return _avg_young_live; } | |
352 AdaptiveWeightedAverage* avg_eden_live() const { return _avg_eden_live; } | |
353 AdaptiveWeightedAverage* avg_old_live() const { return _avg_old_live; } | |
354 | |
355 AdaptivePaddedAverage* avg_survived() const { return _avg_survived; } | |
356 AdaptivePaddedNoZeroDevAverage* avg_pretenured() { return _avg_pretenured; } | |
357 | |
358 // Methods indicating events of interest to the adaptive size policy, | |
359 // called by GC algorithms. It is the responsibility of users of this | |
360 // policy to call these methods at the correct times! | |
361 virtual void minor_collection_begin(); | |
362 virtual void minor_collection_end(GCCause::Cause gc_cause); | |
363 virtual LinearLeastSquareFit* minor_pause_old_estimator() const { | |
364 return _minor_pause_old_estimator; | |
365 } | |
366 | |
367 LinearLeastSquareFit* minor_pause_young_estimator() { | |
368 return _minor_pause_young_estimator; | |
369 } | |
370 LinearLeastSquareFit* minor_collection_estimator() { | |
371 return _minor_collection_estimator; | |
372 } | |
373 | |
374 LinearLeastSquareFit* major_collection_estimator() { | |
375 return _major_collection_estimator; | |
376 } | |
377 | |
378 float minor_pause_young_slope() { | |
379 return _minor_pause_young_estimator->slope(); | |
380 } | |
381 | |
382 float minor_collection_slope() { return _minor_collection_estimator->slope();} | |
383 float major_collection_slope() { return _major_collection_estimator->slope();} | |
384 | |
385 float minor_pause_old_slope() { | |
386 return _minor_pause_old_estimator->slope(); | |
387 } | |
388 | |
389 void set_eden_size(size_t new_size) { | |
390 _eden_size = new_size; | |
391 } | |
392 void set_survivor_size(size_t new_size) { | |
393 _survivor_size = new_size; | |
394 } | |
395 | |
396 size_t calculated_eden_size_in_bytes() const { | |
397 return _eden_size; | |
398 } | |
399 | |
400 size_t calculated_promo_size_in_bytes() const { | |
401 return _promo_size; | |
402 } | |
403 | |
404 size_t calculated_survivor_size_in_bytes() const { | |
405 return _survivor_size; | |
406 } | |
407 | |
408 // This is a hint for the heap: we've detected that gc times | |
409 // are taking longer than GCTimeLimit allows. | |
410 // Most heaps will choose to throw an OutOfMemoryError when | |
411 // this occurs but it is up to the heap to request this information | |
412 // of the policy | |
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413 bool gc_overhead_limit_exceeded() { |
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414 return _gc_overhead_limit_exceeded; |
0 | 415 } |
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416 void set_gc_overhead_limit_exceeded(bool v) { |
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417 _gc_overhead_limit_exceeded = v; |
0 | 418 } |
419 | |
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420 // Tests conditions indicate the GC overhead limit is being approached. |
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421 bool gc_overhead_limit_near() { |
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422 return gc_overhead_limit_count() >= |
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423 (AdaptiveSizePolicyGCTimeLimitThreshold - 1); |
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424 } |
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425 uint gc_overhead_limit_count() { return _gc_overhead_limit_count; } |
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426 void reset_gc_overhead_limit_count() { _gc_overhead_limit_count = 0; } |
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427 void inc_gc_overhead_limit_count() { _gc_overhead_limit_count++; } |
0 | 428 // accessors for flags recording the decisions to resize the |
429 // generations to meet the pause goal. | |
430 | |
431 int change_young_gen_for_min_pauses() const { | |
432 return _change_young_gen_for_min_pauses; | |
433 } | |
434 void set_change_young_gen_for_min_pauses(int v) { | |
435 _change_young_gen_for_min_pauses = v; | |
436 } | |
437 void set_decrease_for_footprint(int v) { _decrease_for_footprint = v; } | |
438 int decrease_for_footprint() const { return _decrease_for_footprint; } | |
439 int decide_at_full_gc() { return _decide_at_full_gc; } | |
440 void set_decide_at_full_gc(int v) { _decide_at_full_gc = v; } | |
441 | |
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442 // Check the conditions for an out-of-memory due to excessive GC time. |
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443 // Set _gc_overhead_limit_exceeded if all the conditions have been met. |
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444 void check_gc_overhead_limit(size_t young_live, |
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445 size_t eden_live, |
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446 size_t max_old_gen_size, |
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447 size_t max_eden_size, |
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448 bool is_full_gc, |
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449 GCCause::Cause gc_cause, |
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450 CollectorPolicy* collector_policy); |
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451 |
0 | 452 // Printing support |
453 virtual bool print_adaptive_size_policy_on(outputStream* st) const; | |
454 bool print_adaptive_size_policy_on(outputStream* st, int | |
455 tenuring_threshold) const; | |
456 }; | |
457 | |
458 // Class that can be used to print information about the | |
459 // adaptive size policy at intervals specified by | |
460 // AdaptiveSizePolicyOutputInterval. Only print information | |
461 // if an adaptive size policy is in use. | |
462 class AdaptiveSizePolicyOutput : StackObj { | |
463 AdaptiveSizePolicy* _size_policy; | |
464 bool _do_print; | |
465 bool print_test(uint count) { | |
466 // A count of zero is a special value that indicates that the | |
467 // interval test should be ignored. An interval is of zero is | |
468 // a special value that indicates that the interval test should | |
469 // always fail (never do the print based on the interval test). | |
470 return PrintGCDetails && | |
471 UseAdaptiveSizePolicy && | |
472 (UseParallelGC || UseConcMarkSweepGC) && | |
473 (AdaptiveSizePolicyOutputInterval > 0) && | |
474 ((count == 0) || | |
475 ((count % AdaptiveSizePolicyOutputInterval) == 0)); | |
476 } | |
477 public: | |
478 // The special value of a zero count can be used to ignore | |
479 // the count test. | |
480 AdaptiveSizePolicyOutput(uint count) { | |
481 if (UseAdaptiveSizePolicy && (AdaptiveSizePolicyOutputInterval > 0)) { | |
482 CollectedHeap* heap = Universe::heap(); | |
483 _size_policy = heap->size_policy(); | |
484 _do_print = print_test(count); | |
485 } else { | |
486 _size_policy = NULL; | |
487 _do_print = false; | |
488 } | |
489 } | |
490 AdaptiveSizePolicyOutput(AdaptiveSizePolicy* size_policy, | |
491 uint count) : | |
492 _size_policy(size_policy) { | |
493 if (UseAdaptiveSizePolicy && (AdaptiveSizePolicyOutputInterval > 0)) { | |
494 _do_print = print_test(count); | |
495 } else { | |
496 _do_print = false; | |
497 } | |
498 } | |
499 ~AdaptiveSizePolicyOutput() { | |
500 if (_do_print) { | |
501 assert(UseAdaptiveSizePolicy, "Should not be in use"); | |
502 _size_policy->print_adaptive_size_policy_on(gclog_or_tty); | |
503 } | |
504 } | |
505 }; |