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annotate src/share/vm/gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp @ 17371:ded2f1abfcda
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author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Wed, 08 Oct 2014 11:41:24 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 2004, 2013, 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 | |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
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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 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSADAPTIVESIZEPOLICY_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSADAPTIVESIZEPOLICY_HPP | |
27 | |
28 #include "gc_implementation/shared/adaptiveSizePolicy.hpp" | |
29 #include "runtime/timer.hpp" | |
30 | |
0 | 31 // This class keeps statistical information and computes the |
32 // size of the heap for the concurrent mark sweep collector. | |
33 // | |
34 // Cost for garbage collector include cost for | |
35 // minor collection | |
36 // concurrent collection | |
37 // stop-the-world component | |
38 // concurrent component | |
39 // major compacting collection | |
40 // uses decaying cost | |
41 | |
42 // Forward decls | |
43 class elapsedTimer; | |
44 | |
45 class CMSAdaptiveSizePolicy : public AdaptiveSizePolicy { | |
46 friend class CMSGCAdaptivePolicyCounters; | |
47 friend class CMSCollector; | |
48 private: | |
49 | |
50 // Total number of processors available | |
51 int _processor_count; | |
52 // Number of processors used by the concurrent phases of GC | |
53 // This number is assumed to be the same for all concurrent | |
54 // phases. | |
55 int _concurrent_processor_count; | |
56 | |
57 // Time that the mutators run exclusive of a particular | |
58 // phase. For example, the time the mutators run excluding | |
59 // the time during which the cms collector runs concurrently | |
60 // with the mutators. | |
61 // Between end of most recent cms reset and start of initial mark | |
62 // This may be redundant | |
63 double _latest_cms_reset_end_to_initial_mark_start_secs; | |
64 // Between end of the most recent initial mark and start of remark | |
65 double _latest_cms_initial_mark_end_to_remark_start_secs; | |
66 // Between end of most recent collection and start of | |
67 // a concurrent collection | |
68 double _latest_cms_collection_end_to_collection_start_secs; | |
69 // Times of the concurrent phases of the most recent | |
70 // concurrent collection | |
71 double _latest_cms_concurrent_marking_time_secs; | |
72 double _latest_cms_concurrent_precleaning_time_secs; | |
73 double _latest_cms_concurrent_sweeping_time_secs; | |
74 // Between end of most recent STW MSC and start of next STW MSC | |
75 double _latest_cms_msc_end_to_msc_start_time_secs; | |
76 // Between end of most recent MS and start of next MS | |
77 // This does not include any time spent during a concurrent | |
78 // collection. | |
79 double _latest_cms_ms_end_to_ms_start; | |
80 // Between start and end of the initial mark of the most recent | |
81 // concurrent collection. | |
82 double _latest_cms_initial_mark_start_to_end_time_secs; | |
83 // Between start and end of the remark phase of the most recent | |
84 // concurrent collection | |
85 double _latest_cms_remark_start_to_end_time_secs; | |
86 // Between start and end of the most recent MS STW marking phase | |
87 double _latest_cms_ms_marking_start_to_end_time_secs; | |
88 | |
89 // Pause time timers | |
90 static elapsedTimer _STW_timer; | |
91 // Concurrent collection timer. Used for total of all concurrent phases | |
92 // during 1 collection cycle. | |
93 static elapsedTimer _concurrent_timer; | |
94 | |
95 // When the size of the generation is changed, the size | |
96 // of the change will rounded up or down (depending on the | |
97 // type of change) by this value. | |
98 size_t _generation_alignment; | |
99 | |
100 // If this variable is true, the size of the young generation | |
101 // may be changed in order to reduce the pause(s) of the | |
102 // collection of the tenured generation in order to meet the | |
103 // pause time goal. It is common to change the size of the | |
104 // tenured generation in order to meet the pause time goal | |
105 // for the tenured generation. With the CMS collector for | |
106 // the tenured generation, the size of the young generation | |
107 // can have an significant affect on the pause times for collecting the | |
108 // tenured generation. | |
109 // This is a duplicate of a variable in PSAdaptiveSizePolicy. It | |
110 // is duplicated because it is not clear that it is general enough | |
111 // to go into AdaptiveSizePolicy. | |
112 int _change_young_gen_for_maj_pauses; | |
113 | |
114 // Variable that is set to true after a collection. | |
115 bool _first_after_collection; | |
116 | |
117 // Fraction of collections that are of each type | |
118 double concurrent_fraction() const; | |
119 double STW_msc_fraction() const; | |
120 double STW_ms_fraction() const; | |
121 | |
122 // This call cannot be put into the epilogue as long as some | |
123 // of the counters can be set during concurrent phases. | |
124 virtual void clear_generation_free_space_flags(); | |
125 | |
126 void set_first_after_collection() { _first_after_collection = true; } | |
127 | |
128 protected: | |
129 // Average of the sum of the concurrent times for | |
130 // one collection in seconds. | |
131 AdaptiveWeightedAverage* _avg_concurrent_time; | |
132 // Average time between concurrent collections in seconds. | |
133 AdaptiveWeightedAverage* _avg_concurrent_interval; | |
134 // Average cost of the concurrent part of a collection | |
135 // in seconds. | |
136 AdaptiveWeightedAverage* _avg_concurrent_gc_cost; | |
137 | |
138 // Average of the initial pause of a concurrent collection in seconds. | |
139 AdaptivePaddedAverage* _avg_initial_pause; | |
140 // Average of the remark pause of a concurrent collection in seconds. | |
141 AdaptivePaddedAverage* _avg_remark_pause; | |
142 | |
143 // Average of the stop-the-world (STW) (initial mark + remark) | |
144 // times in seconds for concurrent collections. | |
145 AdaptiveWeightedAverage* _avg_cms_STW_time; | |
146 // Average of the STW collection cost for concurrent collections. | |
147 AdaptiveWeightedAverage* _avg_cms_STW_gc_cost; | |
148 | |
149 // Average of the bytes free at the start of the sweep. | |
150 AdaptiveWeightedAverage* _avg_cms_free_at_sweep; | |
151 // Average of the bytes free at the end of the collection. | |
152 AdaptiveWeightedAverage* _avg_cms_free; | |
153 // Average of the bytes promoted between cms collections. | |
154 AdaptiveWeightedAverage* _avg_cms_promo; | |
155 | |
156 // stop-the-world (STW) mark-sweep-compact | |
157 // Average of the pause time in seconds for STW mark-sweep-compact | |
158 // collections. | |
159 AdaptiveWeightedAverage* _avg_msc_pause; | |
160 // Average of the interval in seconds between STW mark-sweep-compact | |
161 // collections. | |
162 AdaptiveWeightedAverage* _avg_msc_interval; | |
163 // Average of the collection costs for STW mark-sweep-compact | |
164 // collections. | |
165 AdaptiveWeightedAverage* _avg_msc_gc_cost; | |
166 | |
167 // Averages for mark-sweep collections. | |
168 // The collection may have started as a background collection | |
169 // that completes in a stop-the-world (STW) collection. | |
170 // Average of the pause time in seconds for mark-sweep | |
171 // collections. | |
172 AdaptiveWeightedAverage* _avg_ms_pause; | |
173 // Average of the interval in seconds between mark-sweep | |
174 // collections. | |
175 AdaptiveWeightedAverage* _avg_ms_interval; | |
176 // Average of the collection costs for mark-sweep | |
177 // collections. | |
178 AdaptiveWeightedAverage* _avg_ms_gc_cost; | |
179 | |
180 // These variables contain a linear fit of | |
181 // a generation size as the independent variable | |
182 // and a pause time as the dependent variable. | |
183 // For example _remark_pause_old_estimator | |
184 // is a fit of the old generation size as the | |
185 // independent variable and the remark pause | |
186 // as the dependent variable. | |
187 // remark pause time vs. cms gen size | |
188 LinearLeastSquareFit* _remark_pause_old_estimator; | |
189 // initial pause time vs. cms gen size | |
190 LinearLeastSquareFit* _initial_pause_old_estimator; | |
191 // remark pause time vs. young gen size | |
192 LinearLeastSquareFit* _remark_pause_young_estimator; | |
193 // initial pause time vs. young gen size | |
194 LinearLeastSquareFit* _initial_pause_young_estimator; | |
195 | |
196 // Accessors | |
197 int processor_count() const { return _processor_count; } | |
198 int concurrent_processor_count() const { return _concurrent_processor_count; } | |
199 | |
200 AdaptiveWeightedAverage* avg_concurrent_time() const { | |
201 return _avg_concurrent_time; | |
202 } | |
203 | |
204 AdaptiveWeightedAverage* avg_concurrent_interval() const { | |
205 return _avg_concurrent_interval; | |
206 } | |
207 | |
208 AdaptiveWeightedAverage* avg_concurrent_gc_cost() const { | |
209 return _avg_concurrent_gc_cost; | |
210 } | |
211 | |
212 AdaptiveWeightedAverage* avg_cms_STW_time() const { | |
213 return _avg_cms_STW_time; | |
214 } | |
215 | |
216 AdaptiveWeightedAverage* avg_cms_STW_gc_cost() const { | |
217 return _avg_cms_STW_gc_cost; | |
218 } | |
219 | |
220 AdaptivePaddedAverage* avg_initial_pause() const { | |
221 return _avg_initial_pause; | |
222 } | |
223 | |
224 AdaptivePaddedAverage* avg_remark_pause() const { | |
225 return _avg_remark_pause; | |
226 } | |
227 | |
228 AdaptiveWeightedAverage* avg_cms_free() const { | |
229 return _avg_cms_free; | |
230 } | |
231 | |
232 AdaptiveWeightedAverage* avg_cms_free_at_sweep() const { | |
233 return _avg_cms_free_at_sweep; | |
234 } | |
235 | |
236 AdaptiveWeightedAverage* avg_msc_pause() const { | |
237 return _avg_msc_pause; | |
238 } | |
239 | |
240 AdaptiveWeightedAverage* avg_msc_interval() const { | |
241 return _avg_msc_interval; | |
242 } | |
243 | |
244 AdaptiveWeightedAverage* avg_msc_gc_cost() const { | |
245 return _avg_msc_gc_cost; | |
246 } | |
247 | |
248 AdaptiveWeightedAverage* avg_ms_pause() const { | |
249 return _avg_ms_pause; | |
250 } | |
251 | |
252 AdaptiveWeightedAverage* avg_ms_interval() const { | |
253 return _avg_ms_interval; | |
254 } | |
255 | |
256 AdaptiveWeightedAverage* avg_ms_gc_cost() const { | |
257 return _avg_ms_gc_cost; | |
258 } | |
259 | |
260 LinearLeastSquareFit* remark_pause_old_estimator() { | |
261 return _remark_pause_old_estimator; | |
262 } | |
263 LinearLeastSquareFit* initial_pause_old_estimator() { | |
264 return _initial_pause_old_estimator; | |
265 } | |
266 LinearLeastSquareFit* remark_pause_young_estimator() { | |
267 return _remark_pause_young_estimator; | |
268 } | |
269 LinearLeastSquareFit* initial_pause_young_estimator() { | |
270 return _initial_pause_young_estimator; | |
271 } | |
272 | |
273 // These *slope() methods return the slope | |
274 // m for the linear fit of an independent | |
275 // variable vs. a dependent variable. For | |
276 // example | |
277 // remark_pause = m * old_generation_size + c | |
278 // These may be used to determine if an | |
279 // adjustment should be made to achieve a goal. | |
280 // For example, if remark_pause_old_slope() is | |
281 // positive, a reduction of the old generation | |
282 // size has on average resulted in the reduction | |
283 // of the remark pause. | |
284 float remark_pause_old_slope() { | |
285 return _remark_pause_old_estimator->slope(); | |
286 } | |
287 | |
288 float initial_pause_old_slope() { | |
289 return _initial_pause_old_estimator->slope(); | |
290 } | |
291 | |
292 float remark_pause_young_slope() { | |
293 return _remark_pause_young_estimator->slope(); | |
294 } | |
295 | |
296 float initial_pause_young_slope() { | |
297 return _initial_pause_young_estimator->slope(); | |
298 } | |
299 | |
300 // Update estimators | |
301 void update_minor_pause_old_estimator(double minor_pause_in_ms); | |
302 | |
303 // Fraction of processors used by the concurrent phases. | |
304 double concurrent_processor_fraction(); | |
305 | |
306 // Returns the total times for the concurrent part of the | |
307 // latest collection in seconds. | |
308 double concurrent_collection_time(); | |
309 | |
310 // Return the total times for the concurrent part of the | |
311 // latest collection in seconds where the times of the various | |
312 // concurrent phases are scaled by the processor fraction used | |
313 // during the phase. | |
314 double scaled_concurrent_collection_time(); | |
315 | |
316 // Dimensionless concurrent GC cost for all the concurrent phases. | |
317 double concurrent_collection_cost(double interval_in_seconds); | |
318 | |
319 // Dimensionless GC cost | |
320 double collection_cost(double pause_in_seconds, double interval_in_seconds); | |
321 | |
322 virtual GCPolicyKind kind() const { return _gc_cms_adaptive_size_policy; } | |
323 | |
324 virtual double time_since_major_gc() const; | |
325 | |
326 // This returns the maximum average for the concurrent, ms, and | |
327 // msc collections. This is meant to be used for the calculation | |
328 // of the decayed major gc cost and is not in general the | |
329 // average of all the different types of major collections. | |
330 virtual double major_gc_interval_average_for_decay() const; | |
331 | |
332 public: | |
333 CMSAdaptiveSizePolicy(size_t init_eden_size, | |
334 size_t init_promo_size, | |
335 size_t init_survivor_size, | |
336 double max_gc_minor_pause_sec, | |
337 double max_gc_pause_sec, | |
338 uint gc_cost_ratio); | |
339 | |
340 // The timers for the stop-the-world phases measure a total | |
341 // stop-the-world time. The timer is started and stopped | |
342 // for each phase but is only reset after the final checkpoint. | |
343 void checkpoint_roots_initial_begin(); | |
344 void checkpoint_roots_initial_end(GCCause::Cause gc_cause); | |
345 void checkpoint_roots_final_begin(); | |
346 void checkpoint_roots_final_end(GCCause::Cause gc_cause); | |
347 | |
348 // Methods for gathering information about the | |
349 // concurrent marking phase of the collection. | |
350 // Records the mutator times and | |
351 // resets the concurrent timer. | |
352 void concurrent_marking_begin(); | |
353 // Resets concurrent phase timer in the begin methods and | |
354 // saves the time for a phase in the end methods. | |
355 void concurrent_marking_end(); | |
356 void concurrent_sweeping_begin(); | |
357 void concurrent_sweeping_end(); | |
358 // Similar to the above (e.g., concurrent_marking_end()) and | |
14909 | 359 // is used for both the precleaning an abortable precleaing |
0 | 360 // phases. |
361 void concurrent_precleaning_begin(); | |
362 void concurrent_precleaning_end(); | |
363 // Stops the concurrent phases time. Gathers | |
364 // information and resets the timer. | |
365 void concurrent_phases_end(GCCause::Cause gc_cause, | |
366 size_t cur_eden, | |
367 size_t cur_promo); | |
368 | |
369 // Methods for gather information about STW Mark-Sweep-Compact | |
370 void msc_collection_begin(); | |
371 void msc_collection_end(GCCause::Cause gc_cause); | |
372 | |
373 // Methods for gather information about Mark-Sweep done | |
374 // in the foreground. | |
375 void ms_collection_begin(); | |
376 void ms_collection_end(GCCause::Cause gc_cause); | |
377 | |
378 // Cost for a mark-sweep tenured gen collection done in the foreground | |
379 double ms_gc_cost() const { | |
380 return MAX2(0.0F, _avg_ms_gc_cost->average()); | |
381 } | |
382 | |
383 // Cost of collecting the tenured generation. Includes | |
384 // concurrent collection and STW collection costs | |
385 double cms_gc_cost() const; | |
386 | |
387 // Cost of STW mark-sweep-compact tenured gen collection. | |
388 double msc_gc_cost() const { | |
389 return MAX2(0.0F, _avg_msc_gc_cost->average()); | |
390 } | |
391 | |
392 // | |
393 double compacting_gc_cost() const { | |
394 double result = MIN2(1.0, minor_gc_cost() + msc_gc_cost()); | |
395 assert(result >= 0.0, "Both minor and major costs are non-negative"); | |
396 return result; | |
397 } | |
398 | |
399 // Restarts the concurrent phases timer. | |
400 void concurrent_phases_resume(); | |
401 | |
605 | 402 // Time beginning and end of the marking phase for |
0 | 403 // a synchronous MS collection. A MS collection |
404 // that finishes in the foreground can have started | |
405 // in the background. These methods capture the | |
406 // completion of the marking (after the initial | |
407 // marking) that is done in the foreground. | |
408 void ms_collection_marking_begin(); | |
409 void ms_collection_marking_end(GCCause::Cause gc_cause); | |
410 | |
411 static elapsedTimer* concurrent_timer_ptr() { | |
412 return &_concurrent_timer; | |
413 } | |
414 | |
415 AdaptiveWeightedAverage* avg_cms_promo() const { | |
416 return _avg_cms_promo; | |
417 } | |
418 | |
419 int change_young_gen_for_maj_pauses() { | |
420 return _change_young_gen_for_maj_pauses; | |
421 } | |
422 void set_change_young_gen_for_maj_pauses(int v) { | |
423 _change_young_gen_for_maj_pauses = v; | |
424 } | |
425 | |
426 void clear_internal_time_intervals(); | |
427 | |
428 | |
429 // Either calculated_promo_size_in_bytes() or promo_size() | |
430 // should be deleted. | |
431 size_t promo_size() { return _promo_size; } | |
432 void set_promo_size(size_t v) { _promo_size = v; } | |
433 | |
434 // Cost of GC for all types of collections. | |
435 virtual double gc_cost() const; | |
436 | |
437 size_t generation_alignment() { return _generation_alignment; } | |
438 | |
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439 virtual void compute_eden_space_size(size_t cur_eden, |
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440 size_t max_eden_size); |
0 | 441 // Calculates new survivor space size; returns a new tenuring threshold |
442 // value. Stores new survivor size in _survivor_size. | |
6818 | 443 virtual uint compute_survivor_space_size_and_threshold( |
0 | 444 bool is_survivor_overflow, |
6818 | 445 uint tenuring_threshold, |
0 | 446 size_t survivor_limit); |
447 | |
448 virtual void compute_tenured_generation_free_space(size_t cur_tenured_free, | |
449 size_t max_tenured_available, | |
450 size_t cur_eden); | |
451 | |
452 size_t eden_decrement_aligned_down(size_t cur_eden); | |
453 size_t eden_increment_aligned_up(size_t cur_eden); | |
454 | |
455 size_t adjust_eden_for_pause_time(size_t cur_eden); | |
456 size_t adjust_eden_for_throughput(size_t cur_eden); | |
457 size_t adjust_eden_for_footprint(size_t cur_eden); | |
458 | |
459 size_t promo_decrement_aligned_down(size_t cur_promo); | |
460 size_t promo_increment_aligned_up(size_t cur_promo); | |
461 | |
462 size_t adjust_promo_for_pause_time(size_t cur_promo); | |
463 size_t adjust_promo_for_throughput(size_t cur_promo); | |
464 size_t adjust_promo_for_footprint(size_t cur_promo, size_t cur_eden); | |
465 | |
466 // Scale down the input size by the ratio of the cost to collect the | |
467 // generation to the total GC cost. | |
468 size_t scale_by_gen_gc_cost(size_t base_change, double gen_gc_cost); | |
469 | |
470 // Return the value and clear it. | |
471 bool get_and_clear_first_after_collection(); | |
472 | |
473 // Printing support | |
474 virtual bool print_adaptive_size_policy_on(outputStream* st) const; | |
475 }; | |
1972 | 476 |
477 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSADAPTIVESIZEPOLICY_HPP |