Mercurial > hg > graal-compiler
comparison src/share/vm/gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 5f1f51edaff6 |
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1 /* | |
2 * Copyright 2004-2006 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact 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 #include "incls/_precompiled.incl" | |
25 #include "incls/_cmsAdaptiveSizePolicy.cpp.incl" | |
26 | |
27 elapsedTimer CMSAdaptiveSizePolicy::_concurrent_timer; | |
28 elapsedTimer CMSAdaptiveSizePolicy::_STW_timer; | |
29 | |
30 // Defined if the granularity of the time measurements is potentially too large. | |
31 #define CLOCK_GRANULARITY_TOO_LARGE | |
32 | |
33 CMSAdaptiveSizePolicy::CMSAdaptiveSizePolicy(size_t init_eden_size, | |
34 size_t init_promo_size, | |
35 size_t init_survivor_size, | |
36 double max_gc_minor_pause_sec, | |
37 double max_gc_pause_sec, | |
38 uint gc_cost_ratio) : | |
39 AdaptiveSizePolicy(init_eden_size, | |
40 init_promo_size, | |
41 init_survivor_size, | |
42 max_gc_pause_sec, | |
43 gc_cost_ratio) { | |
44 | |
45 clear_internal_time_intervals(); | |
46 | |
47 _processor_count = os::active_processor_count(); | |
48 | |
49 if (CMSConcurrentMTEnabled && (ParallelCMSThreads > 1)) { | |
50 assert(_processor_count > 0, "Processor count is suspect"); | |
51 _concurrent_processor_count = MIN2((uint) ParallelCMSThreads, | |
52 (uint) _processor_count); | |
53 } else { | |
54 _concurrent_processor_count = 1; | |
55 } | |
56 | |
57 _avg_concurrent_time = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
58 _avg_concurrent_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
59 _avg_concurrent_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
60 | |
61 _avg_initial_pause = new AdaptivePaddedAverage(AdaptiveTimeWeight, | |
62 PausePadding); | |
63 _avg_remark_pause = new AdaptivePaddedAverage(AdaptiveTimeWeight, | |
64 PausePadding); | |
65 | |
66 _avg_cms_STW_time = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
67 _avg_cms_STW_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
68 | |
69 _avg_cms_free = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
70 _avg_cms_free_at_sweep = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
71 _avg_cms_promo = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
72 | |
73 // Mark-sweep-compact | |
74 _avg_msc_pause = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
75 _avg_msc_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
76 _avg_msc_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
77 | |
78 // Mark-sweep | |
79 _avg_ms_pause = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
80 _avg_ms_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
81 _avg_ms_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
82 | |
83 // Variables that estimate pause times as a function of generation | |
84 // size. | |
85 _remark_pause_old_estimator = | |
86 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
87 _initial_pause_old_estimator = | |
88 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
89 _remark_pause_young_estimator = | |
90 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
91 _initial_pause_young_estimator = | |
92 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
93 | |
94 // Alignment comes from that used in ReservedSpace. | |
95 _generation_alignment = os::vm_allocation_granularity(); | |
96 | |
97 // Start the concurrent timer here so that the first | |
98 // concurrent_phases_begin() measures a finite mutator | |
99 // time. A finite mutator time is used to determine | |
100 // if a concurrent collection has been started. If this | |
101 // proves to be a problem, use some explicit flag to | |
102 // signal that a concurrent collection has been started. | |
103 _concurrent_timer.start(); | |
104 _STW_timer.start(); | |
105 } | |
106 | |
107 double CMSAdaptiveSizePolicy::concurrent_processor_fraction() { | |
108 // For now assume no other daemon threads are taking alway | |
109 // cpu's from the application. | |
110 return ((double) _concurrent_processor_count / (double) _processor_count); | |
111 } | |
112 | |
113 double CMSAdaptiveSizePolicy::concurrent_collection_cost( | |
114 double interval_in_seconds) { | |
115 // When the precleaning and sweeping phases use multiple | |
116 // threads, change one_processor_fraction to | |
117 // concurrent_processor_fraction(). | |
118 double one_processor_fraction = 1.0 / ((double) processor_count()); | |
119 double concurrent_cost = | |
120 collection_cost(_latest_cms_concurrent_marking_time_secs, | |
121 interval_in_seconds) * concurrent_processor_fraction() + | |
122 collection_cost(_latest_cms_concurrent_precleaning_time_secs, | |
123 interval_in_seconds) * one_processor_fraction + | |
124 collection_cost(_latest_cms_concurrent_sweeping_time_secs, | |
125 interval_in_seconds) * one_processor_fraction; | |
126 if (PrintAdaptiveSizePolicy && Verbose) { | |
127 gclog_or_tty->print_cr( | |
128 "\nCMSAdaptiveSizePolicy::scaled_concurrent_collection_cost(%f) " | |
129 "_latest_cms_concurrent_marking_cost %f " | |
130 "_latest_cms_concurrent_precleaning_cost %f " | |
131 "_latest_cms_concurrent_sweeping_cost %f " | |
132 "concurrent_processor_fraction %f " | |
133 "concurrent_cost %f ", | |
134 interval_in_seconds, | |
135 collection_cost(_latest_cms_concurrent_marking_time_secs, | |
136 interval_in_seconds), | |
137 collection_cost(_latest_cms_concurrent_precleaning_time_secs, | |
138 interval_in_seconds), | |
139 collection_cost(_latest_cms_concurrent_sweeping_time_secs, | |
140 interval_in_seconds), | |
141 concurrent_processor_fraction(), | |
142 concurrent_cost); | |
143 } | |
144 return concurrent_cost; | |
145 } | |
146 | |
147 double CMSAdaptiveSizePolicy::concurrent_collection_time() { | |
148 double latest_cms_sum_concurrent_phases_time_secs = | |
149 _latest_cms_concurrent_marking_time_secs + | |
150 _latest_cms_concurrent_precleaning_time_secs + | |
151 _latest_cms_concurrent_sweeping_time_secs; | |
152 return latest_cms_sum_concurrent_phases_time_secs; | |
153 } | |
154 | |
155 double CMSAdaptiveSizePolicy::scaled_concurrent_collection_time() { | |
156 // When the precleaning and sweeping phases use multiple | |
157 // threads, change one_processor_fraction to | |
158 // concurrent_processor_fraction(). | |
159 double one_processor_fraction = 1.0 / ((double) processor_count()); | |
160 double latest_cms_sum_concurrent_phases_time_secs = | |
161 _latest_cms_concurrent_marking_time_secs * concurrent_processor_fraction() + | |
162 _latest_cms_concurrent_precleaning_time_secs * one_processor_fraction + | |
163 _latest_cms_concurrent_sweeping_time_secs * one_processor_fraction ; | |
164 if (PrintAdaptiveSizePolicy && Verbose) { | |
165 gclog_or_tty->print_cr( | |
166 "\nCMSAdaptiveSizePolicy::scaled_concurrent_collection_time " | |
167 "_latest_cms_concurrent_marking_time_secs %f " | |
168 "_latest_cms_concurrent_precleaning_time_secs %f " | |
169 "_latest_cms_concurrent_sweeping_time_secs %f " | |
170 "concurrent_processor_fraction %f " | |
171 "latest_cms_sum_concurrent_phases_time_secs %f ", | |
172 _latest_cms_concurrent_marking_time_secs, | |
173 _latest_cms_concurrent_precleaning_time_secs, | |
174 _latest_cms_concurrent_sweeping_time_secs, | |
175 concurrent_processor_fraction(), | |
176 latest_cms_sum_concurrent_phases_time_secs); | |
177 } | |
178 return latest_cms_sum_concurrent_phases_time_secs; | |
179 } | |
180 | |
181 void CMSAdaptiveSizePolicy::update_minor_pause_old_estimator( | |
182 double minor_pause_in_ms) { | |
183 // Get the equivalent of the free space | |
184 // that is available for promotions in the CMS generation | |
185 // and use that to update _minor_pause_old_estimator | |
186 | |
187 // Don't implement this until it is needed. A warning is | |
188 // printed if _minor_pause_old_estimator is used. | |
189 } | |
190 | |
191 void CMSAdaptiveSizePolicy::concurrent_marking_begin() { | |
192 if (PrintAdaptiveSizePolicy && Verbose) { | |
193 gclog_or_tty->print(" "); | |
194 gclog_or_tty->stamp(); | |
195 gclog_or_tty->print(": concurrent_marking_begin "); | |
196 } | |
197 // Update the interval time | |
198 _concurrent_timer.stop(); | |
199 _latest_cms_collection_end_to_collection_start_secs = _concurrent_timer.seconds(); | |
200 if (PrintAdaptiveSizePolicy && Verbose) { | |
201 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_marking_begin: " | |
202 "mutator time %f", _latest_cms_collection_end_to_collection_start_secs); | |
203 } | |
204 _concurrent_timer.reset(); | |
205 _concurrent_timer.start(); | |
206 } | |
207 | |
208 void CMSAdaptiveSizePolicy::concurrent_marking_end() { | |
209 if (PrintAdaptiveSizePolicy && Verbose) { | |
210 gclog_or_tty->stamp(); | |
211 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_marking_end()"); | |
212 } | |
213 | |
214 _concurrent_timer.stop(); | |
215 _latest_cms_concurrent_marking_time_secs = _concurrent_timer.seconds(); | |
216 | |
217 if (PrintAdaptiveSizePolicy && Verbose) { | |
218 gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_marking_end" | |
219 ":concurrent marking time (s) %f", | |
220 _latest_cms_concurrent_marking_time_secs); | |
221 } | |
222 } | |
223 | |
224 void CMSAdaptiveSizePolicy::concurrent_precleaning_begin() { | |
225 if (PrintAdaptiveSizePolicy && Verbose) { | |
226 gclog_or_tty->stamp(); | |
227 gclog_or_tty->print_cr( | |
228 "CMSAdaptiveSizePolicy::concurrent_precleaning_begin()"); | |
229 } | |
230 _concurrent_timer.reset(); | |
231 _concurrent_timer.start(); | |
232 } | |
233 | |
234 | |
235 void CMSAdaptiveSizePolicy::concurrent_precleaning_end() { | |
236 if (PrintAdaptiveSizePolicy && Verbose) { | |
237 gclog_or_tty->stamp(); | |
238 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_precleaning_end()"); | |
239 } | |
240 | |
241 _concurrent_timer.stop(); | |
242 // May be set again by a second call during the same collection. | |
243 _latest_cms_concurrent_precleaning_time_secs = _concurrent_timer.seconds(); | |
244 | |
245 if (PrintAdaptiveSizePolicy && Verbose) { | |
246 gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_precleaning_end" | |
247 ":concurrent precleaning time (s) %f", | |
248 _latest_cms_concurrent_precleaning_time_secs); | |
249 } | |
250 } | |
251 | |
252 void CMSAdaptiveSizePolicy::concurrent_sweeping_begin() { | |
253 if (PrintAdaptiveSizePolicy && Verbose) { | |
254 gclog_or_tty->stamp(); | |
255 gclog_or_tty->print_cr( | |
256 "CMSAdaptiveSizePolicy::concurrent_sweeping_begin()"); | |
257 } | |
258 _concurrent_timer.reset(); | |
259 _concurrent_timer.start(); | |
260 } | |
261 | |
262 | |
263 void CMSAdaptiveSizePolicy::concurrent_sweeping_end() { | |
264 if (PrintAdaptiveSizePolicy && Verbose) { | |
265 gclog_or_tty->stamp(); | |
266 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_sweeping_end()"); | |
267 } | |
268 | |
269 _concurrent_timer.stop(); | |
270 _latest_cms_concurrent_sweeping_time_secs = _concurrent_timer.seconds(); | |
271 | |
272 if (PrintAdaptiveSizePolicy && Verbose) { | |
273 gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_sweeping_end" | |
274 ":concurrent sweeping time (s) %f", | |
275 _latest_cms_concurrent_sweeping_time_secs); | |
276 } | |
277 } | |
278 | |
279 void CMSAdaptiveSizePolicy::concurrent_phases_end(GCCause::Cause gc_cause, | |
280 size_t cur_eden, | |
281 size_t cur_promo) { | |
282 if (PrintAdaptiveSizePolicy && Verbose) { | |
283 gclog_or_tty->print(" "); | |
284 gclog_or_tty->stamp(); | |
285 gclog_or_tty->print(": concurrent_phases_end "); | |
286 } | |
287 | |
288 // Update the concurrent timer | |
289 _concurrent_timer.stop(); | |
290 | |
291 if (gc_cause != GCCause::_java_lang_system_gc || | |
292 UseAdaptiveSizePolicyWithSystemGC) { | |
293 | |
294 avg_cms_free()->sample(cur_promo); | |
295 double latest_cms_sum_concurrent_phases_time_secs = | |
296 concurrent_collection_time(); | |
297 | |
298 _avg_concurrent_time->sample(latest_cms_sum_concurrent_phases_time_secs); | |
299 | |
300 // Cost of collection (unit-less) | |
301 | |
302 // Total interval for collection. May not be valid. Tests | |
303 // below determine whether to use this. | |
304 // | |
305 if (PrintAdaptiveSizePolicy && Verbose) { | |
306 gclog_or_tty->print_cr("\nCMSAdaptiveSizePolicy::concurrent_phases_end \n" | |
307 "_latest_cms_reset_end_to_initial_mark_start_secs %f \n" | |
308 "_latest_cms_initial_mark_start_to_end_time_secs %f \n" | |
309 "_latest_cms_remark_start_to_end_time_secs %f \n" | |
310 "_latest_cms_concurrent_marking_time_secs %f \n" | |
311 "_latest_cms_concurrent_precleaning_time_secs %f \n" | |
312 "_latest_cms_concurrent_sweeping_time_secs %f \n" | |
313 "latest_cms_sum_concurrent_phases_time_secs %f \n" | |
314 "_latest_cms_collection_end_to_collection_start_secs %f \n" | |
315 "concurrent_processor_fraction %f", | |
316 _latest_cms_reset_end_to_initial_mark_start_secs, | |
317 _latest_cms_initial_mark_start_to_end_time_secs, | |
318 _latest_cms_remark_start_to_end_time_secs, | |
319 _latest_cms_concurrent_marking_time_secs, | |
320 _latest_cms_concurrent_precleaning_time_secs, | |
321 _latest_cms_concurrent_sweeping_time_secs, | |
322 latest_cms_sum_concurrent_phases_time_secs, | |
323 _latest_cms_collection_end_to_collection_start_secs, | |
324 concurrent_processor_fraction()); | |
325 } | |
326 double interval_in_seconds = | |
327 _latest_cms_initial_mark_start_to_end_time_secs + | |
328 _latest_cms_remark_start_to_end_time_secs + | |
329 latest_cms_sum_concurrent_phases_time_secs + | |
330 _latest_cms_collection_end_to_collection_start_secs; | |
331 assert(interval_in_seconds >= 0.0, | |
332 "Bad interval between cms collections"); | |
333 | |
334 // Sample for performance counter | |
335 avg_concurrent_interval()->sample(interval_in_seconds); | |
336 | |
337 // STW costs (initial and remark pauses) | |
338 // Cost of collection (unit-less) | |
339 assert(_latest_cms_initial_mark_start_to_end_time_secs >= 0.0, | |
340 "Bad initial mark pause"); | |
341 assert(_latest_cms_remark_start_to_end_time_secs >= 0.0, | |
342 "Bad remark pause"); | |
343 double STW_time_in_seconds = | |
344 _latest_cms_initial_mark_start_to_end_time_secs + | |
345 _latest_cms_remark_start_to_end_time_secs; | |
346 double STW_collection_cost = 0.0; | |
347 if (interval_in_seconds > 0.0) { | |
348 // cost for the STW phases of the concurrent collection. | |
349 STW_collection_cost = STW_time_in_seconds / interval_in_seconds; | |
350 avg_cms_STW_gc_cost()->sample(STW_collection_cost); | |
351 } | |
352 if (PrintAdaptiveSizePolicy && Verbose) { | |
353 gclog_or_tty->print("cmsAdaptiveSizePolicy::STW_collection_end: " | |
354 "STW gc cost: %f average: %f", STW_collection_cost, | |
355 avg_cms_STW_gc_cost()->average()); | |
356 gclog_or_tty->print_cr(" STW pause: %f (ms) STW period %f (ms)", | |
357 (double) STW_time_in_seconds * MILLIUNITS, | |
358 (double) interval_in_seconds * MILLIUNITS); | |
359 } | |
360 | |
361 double concurrent_cost = 0.0; | |
362 if (latest_cms_sum_concurrent_phases_time_secs > 0.0) { | |
363 concurrent_cost = concurrent_collection_cost(interval_in_seconds); | |
364 | |
365 avg_concurrent_gc_cost()->sample(concurrent_cost); | |
366 // Average this ms cost into all the other types gc costs | |
367 | |
368 if (PrintAdaptiveSizePolicy && Verbose) { | |
369 gclog_or_tty->print("cmsAdaptiveSizePolicy::concurrent_phases_end: " | |
370 "concurrent gc cost: %f average: %f", | |
371 concurrent_cost, | |
372 _avg_concurrent_gc_cost->average()); | |
373 gclog_or_tty->print_cr(" concurrent time: %f (ms) cms period %f (ms)" | |
374 " processor fraction: %f", | |
375 latest_cms_sum_concurrent_phases_time_secs * MILLIUNITS, | |
376 interval_in_seconds * MILLIUNITS, | |
377 concurrent_processor_fraction()); | |
378 } | |
379 } | |
380 double total_collection_cost = STW_collection_cost + concurrent_cost; | |
381 avg_major_gc_cost()->sample(total_collection_cost); | |
382 | |
383 // Gather information for estimating future behavior | |
384 double initial_pause_in_ms = _latest_cms_initial_mark_start_to_end_time_secs * MILLIUNITS; | |
385 double remark_pause_in_ms = _latest_cms_remark_start_to_end_time_secs * MILLIUNITS; | |
386 | |
387 double cur_promo_size_in_mbytes = ((double)cur_promo)/((double)M); | |
388 initial_pause_old_estimator()->update(cur_promo_size_in_mbytes, | |
389 initial_pause_in_ms); | |
390 remark_pause_old_estimator()->update(cur_promo_size_in_mbytes, | |
391 remark_pause_in_ms); | |
392 major_collection_estimator()->update(cur_promo_size_in_mbytes, | |
393 total_collection_cost); | |
394 | |
395 // This estimate uses the average eden size. It could also | |
396 // have used the latest eden size. Which is better? | |
397 double cur_eden_size_in_mbytes = ((double)cur_eden)/((double) M); | |
398 initial_pause_young_estimator()->update(cur_eden_size_in_mbytes, | |
399 initial_pause_in_ms); | |
400 remark_pause_young_estimator()->update(cur_eden_size_in_mbytes, | |
401 remark_pause_in_ms); | |
402 } | |
403 | |
404 clear_internal_time_intervals(); | |
405 | |
406 set_first_after_collection(); | |
407 | |
408 // The concurrent phases keeps track of it's own mutator interval | |
409 // with this timer. This allows the stop-the-world phase to | |
410 // be included in the mutator time so that the stop-the-world time | |
411 // is not double counted. Reset and start it. | |
412 _concurrent_timer.reset(); | |
413 _concurrent_timer.start(); | |
414 | |
415 // The mutator time between STW phases does not include the | |
416 // concurrent collection time. | |
417 _STW_timer.reset(); | |
418 _STW_timer.start(); | |
419 } | |
420 | |
421 void CMSAdaptiveSizePolicy::checkpoint_roots_initial_begin() { | |
422 // Update the interval time | |
423 _STW_timer.stop(); | |
424 _latest_cms_reset_end_to_initial_mark_start_secs = _STW_timer.seconds(); | |
425 // Reset for the initial mark | |
426 _STW_timer.reset(); | |
427 _STW_timer.start(); | |
428 } | |
429 | |
430 void CMSAdaptiveSizePolicy::checkpoint_roots_initial_end( | |
431 GCCause::Cause gc_cause) { | |
432 _STW_timer.stop(); | |
433 | |
434 if (gc_cause != GCCause::_java_lang_system_gc || | |
435 UseAdaptiveSizePolicyWithSystemGC) { | |
436 _latest_cms_initial_mark_start_to_end_time_secs = _STW_timer.seconds(); | |
437 avg_initial_pause()->sample(_latest_cms_initial_mark_start_to_end_time_secs); | |
438 | |
439 if (PrintAdaptiveSizePolicy && Verbose) { | |
440 gclog_or_tty->print( | |
441 "cmsAdaptiveSizePolicy::checkpoint_roots_initial_end: " | |
442 "initial pause: %f ", _latest_cms_initial_mark_start_to_end_time_secs); | |
443 } | |
444 } | |
445 | |
446 _STW_timer.reset(); | |
447 _STW_timer.start(); | |
448 } | |
449 | |
450 void CMSAdaptiveSizePolicy::checkpoint_roots_final_begin() { | |
451 _STW_timer.stop(); | |
452 _latest_cms_initial_mark_end_to_remark_start_secs = _STW_timer.seconds(); | |
453 // Start accumumlating time for the remark in the STW timer. | |
454 _STW_timer.reset(); | |
455 _STW_timer.start(); | |
456 } | |
457 | |
458 void CMSAdaptiveSizePolicy::checkpoint_roots_final_end( | |
459 GCCause::Cause gc_cause) { | |
460 _STW_timer.stop(); | |
461 if (gc_cause != GCCause::_java_lang_system_gc || | |
462 UseAdaptiveSizePolicyWithSystemGC) { | |
463 // Total initial mark pause + remark pause. | |
464 _latest_cms_remark_start_to_end_time_secs = _STW_timer.seconds(); | |
465 double STW_time_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs + | |
466 _latest_cms_remark_start_to_end_time_secs; | |
467 double STW_time_in_ms = STW_time_in_seconds * MILLIUNITS; | |
468 | |
469 avg_remark_pause()->sample(_latest_cms_remark_start_to_end_time_secs); | |
470 | |
471 // Sample total for initial mark + remark | |
472 avg_cms_STW_time()->sample(STW_time_in_seconds); | |
473 | |
474 if (PrintAdaptiveSizePolicy && Verbose) { | |
475 gclog_or_tty->print("cmsAdaptiveSizePolicy::checkpoint_roots_final_end: " | |
476 "remark pause: %f", _latest_cms_remark_start_to_end_time_secs); | |
477 } | |
478 | |
479 } | |
480 // Don't start the STW times here because the concurrent | |
481 // sweep and reset has not happened. | |
482 // Keep the old comment above in case I don't understand | |
483 // what is going on but now | |
484 // Start the STW timer because it is used by ms_collection_begin() | |
485 // and ms_collection_end() to get the sweep time if a MS is being | |
486 // done in the foreground. | |
487 _STW_timer.reset(); | |
488 _STW_timer.start(); | |
489 } | |
490 | |
491 void CMSAdaptiveSizePolicy::msc_collection_begin() { | |
492 if (PrintAdaptiveSizePolicy && Verbose) { | |
493 gclog_or_tty->print(" "); | |
494 gclog_or_tty->stamp(); | |
495 gclog_or_tty->print(": msc_collection_begin "); | |
496 } | |
497 _STW_timer.stop(); | |
498 _latest_cms_msc_end_to_msc_start_time_secs = _STW_timer.seconds(); | |
499 if (PrintAdaptiveSizePolicy && Verbose) { | |
500 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::msc_collection_begin: " | |
501 "mutator time %f", | |
502 _latest_cms_msc_end_to_msc_start_time_secs); | |
503 } | |
504 avg_msc_interval()->sample(_latest_cms_msc_end_to_msc_start_time_secs); | |
505 _STW_timer.reset(); | |
506 _STW_timer.start(); | |
507 } | |
508 | |
509 void CMSAdaptiveSizePolicy::msc_collection_end(GCCause::Cause gc_cause) { | |
510 if (PrintAdaptiveSizePolicy && Verbose) { | |
511 gclog_or_tty->print(" "); | |
512 gclog_or_tty->stamp(); | |
513 gclog_or_tty->print(": msc_collection_end "); | |
514 } | |
515 _STW_timer.stop(); | |
516 if (gc_cause != GCCause::_java_lang_system_gc || | |
517 UseAdaptiveSizePolicyWithSystemGC) { | |
518 double msc_pause_in_seconds = _STW_timer.seconds(); | |
519 if ((_latest_cms_msc_end_to_msc_start_time_secs > 0.0) && | |
520 (msc_pause_in_seconds > 0.0)) { | |
521 avg_msc_pause()->sample(msc_pause_in_seconds); | |
522 double mutator_time_in_seconds = 0.0; | |
523 if (_latest_cms_collection_end_to_collection_start_secs == 0.0) { | |
524 // This assertion may fail because of time stamp gradularity. | |
525 // Comment it out and investiage it at a later time. The large | |
526 // time stamp granularity occurs on some older linux systems. | |
527 #ifndef CLOCK_GRANULARITY_TOO_LARGE | |
528 assert((_latest_cms_concurrent_marking_time_secs == 0.0) && | |
529 (_latest_cms_concurrent_precleaning_time_secs == 0.0) && | |
530 (_latest_cms_concurrent_sweeping_time_secs == 0.0), | |
531 "There should not be any concurrent time"); | |
532 #endif | |
533 // A concurrent collection did not start. Mutator time | |
534 // between collections comes from the STW MSC timer. | |
535 mutator_time_in_seconds = _latest_cms_msc_end_to_msc_start_time_secs; | |
536 } else { | |
537 // The concurrent collection did start so count the mutator | |
538 // time to the start of the concurrent collection. In this | |
539 // case the _latest_cms_msc_end_to_msc_start_time_secs measures | |
540 // the time between the initial mark or remark and the | |
541 // start of the MSC. That has no real meaning. | |
542 mutator_time_in_seconds = _latest_cms_collection_end_to_collection_start_secs; | |
543 } | |
544 | |
545 double latest_cms_sum_concurrent_phases_time_secs = | |
546 concurrent_collection_time(); | |
547 double interval_in_seconds = | |
548 mutator_time_in_seconds + | |
549 _latest_cms_initial_mark_start_to_end_time_secs + | |
550 _latest_cms_remark_start_to_end_time_secs + | |
551 latest_cms_sum_concurrent_phases_time_secs + | |
552 msc_pause_in_seconds; | |
553 | |
554 if (PrintAdaptiveSizePolicy && Verbose) { | |
555 gclog_or_tty->print_cr(" interval_in_seconds %f \n" | |
556 " mutator_time_in_seconds %f \n" | |
557 " _latest_cms_initial_mark_start_to_end_time_secs %f\n" | |
558 " _latest_cms_remark_start_to_end_time_secs %f\n" | |
559 " latest_cms_sum_concurrent_phases_time_secs %f\n" | |
560 " msc_pause_in_seconds %f\n", | |
561 interval_in_seconds, | |
562 mutator_time_in_seconds, | |
563 _latest_cms_initial_mark_start_to_end_time_secs, | |
564 _latest_cms_remark_start_to_end_time_secs, | |
565 latest_cms_sum_concurrent_phases_time_secs, | |
566 msc_pause_in_seconds); | |
567 } | |
568 | |
569 // The concurrent cost is wasted cost but it should be | |
570 // included. | |
571 double concurrent_cost = concurrent_collection_cost(interval_in_seconds); | |
572 | |
573 // Initial mark and remark, also wasted. | |
574 double STW_time_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs + | |
575 _latest_cms_remark_start_to_end_time_secs; | |
576 double STW_collection_cost = | |
577 collection_cost(STW_time_in_seconds, interval_in_seconds) + | |
578 concurrent_cost; | |
579 | |
580 if (PrintAdaptiveSizePolicy && Verbose) { | |
581 gclog_or_tty->print_cr(" msc_collection_end:\n" | |
582 "_latest_cms_collection_end_to_collection_start_secs %f\n" | |
583 "_latest_cms_msc_end_to_msc_start_time_secs %f\n" | |
584 "_latest_cms_initial_mark_start_to_end_time_secs %f\n" | |
585 "_latest_cms_remark_start_to_end_time_secs %f\n" | |
586 "latest_cms_sum_concurrent_phases_time_secs %f\n", | |
587 _latest_cms_collection_end_to_collection_start_secs, | |
588 _latest_cms_msc_end_to_msc_start_time_secs, | |
589 _latest_cms_initial_mark_start_to_end_time_secs, | |
590 _latest_cms_remark_start_to_end_time_secs, | |
591 latest_cms_sum_concurrent_phases_time_secs); | |
592 | |
593 gclog_or_tty->print_cr(" msc_collection_end: \n" | |
594 "latest_cms_sum_concurrent_phases_time_secs %f\n" | |
595 "STW_time_in_seconds %f\n" | |
596 "msc_pause_in_seconds %f\n", | |
597 latest_cms_sum_concurrent_phases_time_secs, | |
598 STW_time_in_seconds, | |
599 msc_pause_in_seconds); | |
600 } | |
601 | |
602 double cost = concurrent_cost + STW_collection_cost + | |
603 collection_cost(msc_pause_in_seconds, interval_in_seconds); | |
604 | |
605 _avg_msc_gc_cost->sample(cost); | |
606 | |
607 // Average this ms cost into all the other types gc costs | |
608 avg_major_gc_cost()->sample(cost); | |
609 | |
610 // Sample for performance counter | |
611 _avg_msc_interval->sample(interval_in_seconds); | |
612 if (PrintAdaptiveSizePolicy && Verbose) { | |
613 gclog_or_tty->print("cmsAdaptiveSizePolicy::msc_collection_end: " | |
614 "MSC gc cost: %f average: %f", cost, | |
615 _avg_msc_gc_cost->average()); | |
616 | |
617 double msc_pause_in_ms = msc_pause_in_seconds * MILLIUNITS; | |
618 gclog_or_tty->print_cr(" MSC pause: %f (ms) MSC period %f (ms)", | |
619 msc_pause_in_ms, (double) interval_in_seconds * MILLIUNITS); | |
620 } | |
621 } | |
622 } | |
623 | |
624 clear_internal_time_intervals(); | |
625 | |
626 // Can this call be put into the epilogue? | |
627 set_first_after_collection(); | |
628 | |
629 // The concurrent phases keeps track of it's own mutator interval | |
630 // with this timer. This allows the stop-the-world phase to | |
631 // be included in the mutator time so that the stop-the-world time | |
632 // is not double counted. Reset and start it. | |
633 _concurrent_timer.stop(); | |
634 _concurrent_timer.reset(); | |
635 _concurrent_timer.start(); | |
636 | |
637 _STW_timer.reset(); | |
638 _STW_timer.start(); | |
639 } | |
640 | |
641 void CMSAdaptiveSizePolicy::ms_collection_begin() { | |
642 if (PrintAdaptiveSizePolicy && Verbose) { | |
643 gclog_or_tty->print(" "); | |
644 gclog_or_tty->stamp(); | |
645 gclog_or_tty->print(": ms_collection_begin "); | |
646 } | |
647 _STW_timer.stop(); | |
648 _latest_cms_ms_end_to_ms_start = _STW_timer.seconds(); | |
649 if (PrintAdaptiveSizePolicy && Verbose) { | |
650 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::ms_collection_begin: " | |
651 "mutator time %f", | |
652 _latest_cms_ms_end_to_ms_start); | |
653 } | |
654 avg_ms_interval()->sample(_STW_timer.seconds()); | |
655 _STW_timer.reset(); | |
656 _STW_timer.start(); | |
657 } | |
658 | |
659 void CMSAdaptiveSizePolicy::ms_collection_end(GCCause::Cause gc_cause) { | |
660 if (PrintAdaptiveSizePolicy && Verbose) { | |
661 gclog_or_tty->print(" "); | |
662 gclog_or_tty->stamp(); | |
663 gclog_or_tty->print(": ms_collection_end "); | |
664 } | |
665 _STW_timer.stop(); | |
666 if (gc_cause != GCCause::_java_lang_system_gc || | |
667 UseAdaptiveSizePolicyWithSystemGC) { | |
668 // The MS collection is a foreground collection that does all | |
669 // the parts of a mostly concurrent collection. | |
670 // | |
671 // For this collection include the cost of the | |
672 // initial mark | |
673 // remark | |
674 // all concurrent time (scaled down by the | |
675 // concurrent_processor_fraction). Some | |
676 // may be zero if the baton was passed before | |
677 // it was reached. | |
678 // concurrent marking | |
679 // sweeping | |
680 // resetting | |
681 // STW after baton was passed (STW_in_foreground_in_seconds) | |
682 double STW_in_foreground_in_seconds = _STW_timer.seconds(); | |
683 | |
684 double latest_cms_sum_concurrent_phases_time_secs = | |
685 concurrent_collection_time(); | |
686 if (PrintAdaptiveSizePolicy && Verbose) { | |
687 gclog_or_tty->print_cr("\nCMSAdaptiveSizePolicy::ms_collecton_end " | |
688 "STW_in_foreground_in_seconds %f " | |
689 "_latest_cms_initial_mark_start_to_end_time_secs %f " | |
690 "_latest_cms_remark_start_to_end_time_secs %f " | |
691 "latest_cms_sum_concurrent_phases_time_secs %f " | |
692 "_latest_cms_ms_marking_start_to_end_time_secs %f " | |
693 "_latest_cms_ms_end_to_ms_start %f", | |
694 STW_in_foreground_in_seconds, | |
695 _latest_cms_initial_mark_start_to_end_time_secs, | |
696 _latest_cms_remark_start_to_end_time_secs, | |
697 latest_cms_sum_concurrent_phases_time_secs, | |
698 _latest_cms_ms_marking_start_to_end_time_secs, | |
699 _latest_cms_ms_end_to_ms_start); | |
700 } | |
701 | |
702 double STW_marking_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs + | |
703 _latest_cms_remark_start_to_end_time_secs; | |
704 #ifndef CLOCK_GRANULARITY_TOO_LARGE | |
705 assert(_latest_cms_ms_marking_start_to_end_time_secs == 0.0 || | |
706 latest_cms_sum_concurrent_phases_time_secs == 0.0, | |
707 "marking done twice?"); | |
708 #endif | |
709 double ms_time_in_seconds = STW_marking_in_seconds + | |
710 STW_in_foreground_in_seconds + | |
711 _latest_cms_ms_marking_start_to_end_time_secs + | |
712 scaled_concurrent_collection_time(); | |
713 avg_ms_pause()->sample(ms_time_in_seconds); | |
714 // Use the STW costs from the initial mark and remark plus | |
715 // the cost of the concurrent phase to calculate a | |
716 // collection cost. | |
717 double cost = 0.0; | |
718 if ((_latest_cms_ms_end_to_ms_start > 0.0) && | |
719 (ms_time_in_seconds > 0.0)) { | |
720 double interval_in_seconds = | |
721 _latest_cms_ms_end_to_ms_start + ms_time_in_seconds; | |
722 | |
723 if (PrintAdaptiveSizePolicy && Verbose) { | |
724 gclog_or_tty->print_cr("\n ms_time_in_seconds %f " | |
725 "latest_cms_sum_concurrent_phases_time_secs %f " | |
726 "interval_in_seconds %f", | |
727 ms_time_in_seconds, | |
728 latest_cms_sum_concurrent_phases_time_secs, | |
729 interval_in_seconds); | |
730 } | |
731 | |
732 cost = collection_cost(ms_time_in_seconds, interval_in_seconds); | |
733 | |
734 _avg_ms_gc_cost->sample(cost); | |
735 // Average this ms cost into all the other types gc costs | |
736 avg_major_gc_cost()->sample(cost); | |
737 | |
738 // Sample for performance counter | |
739 _avg_ms_interval->sample(interval_in_seconds); | |
740 } | |
741 if (PrintAdaptiveSizePolicy && Verbose) { | |
742 gclog_or_tty->print("cmsAdaptiveSizePolicy::ms_collection_end: " | |
743 "MS gc cost: %f average: %f", cost, _avg_ms_gc_cost->average()); | |
744 | |
745 double ms_time_in_ms = ms_time_in_seconds * MILLIUNITS; | |
746 gclog_or_tty->print_cr(" MS pause: %f (ms) MS period %f (ms)", | |
747 ms_time_in_ms, | |
748 _latest_cms_ms_end_to_ms_start * MILLIUNITS); | |
749 } | |
750 } | |
751 | |
752 // Consider putting this code (here to end) into a | |
753 // method for convenience. | |
754 clear_internal_time_intervals(); | |
755 | |
756 set_first_after_collection(); | |
757 | |
758 // The concurrent phases keeps track of it's own mutator interval | |
759 // with this timer. This allows the stop-the-world phase to | |
760 // be included in the mutator time so that the stop-the-world time | |
761 // is not double counted. Reset and start it. | |
762 _concurrent_timer.stop(); | |
763 _concurrent_timer.reset(); | |
764 _concurrent_timer.start(); | |
765 | |
766 _STW_timer.reset(); | |
767 _STW_timer.start(); | |
768 } | |
769 | |
770 void CMSAdaptiveSizePolicy::clear_internal_time_intervals() { | |
771 _latest_cms_reset_end_to_initial_mark_start_secs = 0.0; | |
772 _latest_cms_initial_mark_end_to_remark_start_secs = 0.0; | |
773 _latest_cms_collection_end_to_collection_start_secs = 0.0; | |
774 _latest_cms_concurrent_marking_time_secs = 0.0; | |
775 _latest_cms_concurrent_precleaning_time_secs = 0.0; | |
776 _latest_cms_concurrent_sweeping_time_secs = 0.0; | |
777 _latest_cms_msc_end_to_msc_start_time_secs = 0.0; | |
778 _latest_cms_ms_end_to_ms_start = 0.0; | |
779 _latest_cms_remark_start_to_end_time_secs = 0.0; | |
780 _latest_cms_initial_mark_start_to_end_time_secs = 0.0; | |
781 _latest_cms_ms_marking_start_to_end_time_secs = 0.0; | |
782 } | |
783 | |
784 void CMSAdaptiveSizePolicy::clear_generation_free_space_flags() { | |
785 AdaptiveSizePolicy::clear_generation_free_space_flags(); | |
786 | |
787 set_change_young_gen_for_maj_pauses(0); | |
788 } | |
789 | |
790 void CMSAdaptiveSizePolicy::concurrent_phases_resume() { | |
791 if (PrintAdaptiveSizePolicy && Verbose) { | |
792 gclog_or_tty->stamp(); | |
793 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_phases_resume()"); | |
794 } | |
795 _concurrent_timer.start(); | |
796 } | |
797 | |
798 double CMSAdaptiveSizePolicy::time_since_major_gc() const { | |
799 _concurrent_timer.stop(); | |
800 double time_since_cms_gc = _concurrent_timer.seconds(); | |
801 _concurrent_timer.start(); | |
802 _STW_timer.stop(); | |
803 double time_since_STW_gc = _STW_timer.seconds(); | |
804 _STW_timer.start(); | |
805 | |
806 return MIN2(time_since_cms_gc, time_since_STW_gc); | |
807 } | |
808 | |
809 double CMSAdaptiveSizePolicy::major_gc_interval_average_for_decay() const { | |
810 double cms_interval = _avg_concurrent_interval->average(); | |
811 double msc_interval = _avg_msc_interval->average(); | |
812 double ms_interval = _avg_ms_interval->average(); | |
813 | |
814 return MAX3(cms_interval, msc_interval, ms_interval); | |
815 } | |
816 | |
817 double CMSAdaptiveSizePolicy::cms_gc_cost() const { | |
818 return avg_major_gc_cost()->average(); | |
819 } | |
820 | |
821 void CMSAdaptiveSizePolicy::ms_collection_marking_begin() { | |
822 _STW_timer.stop(); | |
823 // Start accumumlating time for the marking in the STW timer. | |
824 _STW_timer.reset(); | |
825 _STW_timer.start(); | |
826 } | |
827 | |
828 void CMSAdaptiveSizePolicy::ms_collection_marking_end( | |
829 GCCause::Cause gc_cause) { | |
830 _STW_timer.stop(); | |
831 if (gc_cause != GCCause::_java_lang_system_gc || | |
832 UseAdaptiveSizePolicyWithSystemGC) { | |
833 _latest_cms_ms_marking_start_to_end_time_secs = _STW_timer.seconds(); | |
834 if (PrintAdaptiveSizePolicy && Verbose) { | |
835 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::" | |
836 "msc_collection_marking_end: mutator time %f", | |
837 _latest_cms_ms_marking_start_to_end_time_secs); | |
838 } | |
839 } | |
840 _STW_timer.reset(); | |
841 _STW_timer.start(); | |
842 } | |
843 | |
844 double CMSAdaptiveSizePolicy::gc_cost() const { | |
845 double cms_gen_cost = cms_gc_cost(); | |
846 double result = MIN2(1.0, minor_gc_cost() + cms_gen_cost); | |
847 assert(result >= 0.0, "Both minor and major costs are non-negative"); | |
848 return result; | |
849 } | |
850 | |
851 // Cost of collection (unit-less) | |
852 double CMSAdaptiveSizePolicy::collection_cost(double pause_in_seconds, | |
853 double interval_in_seconds) { | |
854 // Cost of collection (unit-less) | |
855 double cost = 0.0; | |
856 if ((interval_in_seconds > 0.0) && | |
857 (pause_in_seconds > 0.0)) { | |
858 cost = | |
859 pause_in_seconds / interval_in_seconds; | |
860 } | |
861 return cost; | |
862 } | |
863 | |
864 size_t CMSAdaptiveSizePolicy::adjust_eden_for_pause_time(size_t cur_eden) { | |
865 size_t change = 0; | |
866 size_t desired_eden = cur_eden; | |
867 | |
868 // reduce eden size | |
869 change = eden_decrement_aligned_down(cur_eden); | |
870 desired_eden = cur_eden - change; | |
871 | |
872 if (PrintAdaptiveSizePolicy && Verbose) { | |
873 gclog_or_tty->print_cr( | |
874 "CMSAdaptiveSizePolicy::adjust_eden_for_pause_time " | |
875 "adjusting eden for pause time. " | |
876 " starting eden size " SIZE_FORMAT | |
877 " reduced eden size " SIZE_FORMAT | |
878 " eden delta " SIZE_FORMAT, | |
879 cur_eden, desired_eden, change); | |
880 } | |
881 | |
882 return desired_eden; | |
883 } | |
884 | |
885 size_t CMSAdaptiveSizePolicy::adjust_eden_for_throughput(size_t cur_eden) { | |
886 | |
887 size_t desired_eden = cur_eden; | |
888 | |
889 set_change_young_gen_for_throughput(increase_young_gen_for_througput_true); | |
890 | |
891 size_t change = eden_increment_aligned_up(cur_eden); | |
892 size_t scaled_change = scale_by_gen_gc_cost(change, minor_gc_cost()); | |
893 | |
894 if (cur_eden + scaled_change > cur_eden) { | |
895 desired_eden = cur_eden + scaled_change; | |
896 } | |
897 | |
898 _young_gen_change_for_minor_throughput++; | |
899 | |
900 if (PrintAdaptiveSizePolicy && Verbose) { | |
901 gclog_or_tty->print_cr( | |
902 "CMSAdaptiveSizePolicy::adjust_eden_for_throughput " | |
903 "adjusting eden for throughput. " | |
904 " starting eden size " SIZE_FORMAT | |
905 " increased eden size " SIZE_FORMAT | |
906 " eden delta " SIZE_FORMAT, | |
907 cur_eden, desired_eden, scaled_change); | |
908 } | |
909 | |
910 return desired_eden; | |
911 } | |
912 | |
913 size_t CMSAdaptiveSizePolicy::adjust_eden_for_footprint(size_t cur_eden) { | |
914 | |
915 set_decrease_for_footprint(decrease_young_gen_for_footprint_true); | |
916 | |
917 size_t change = eden_decrement(cur_eden); | |
918 size_t desired_eden_size = cur_eden - change; | |
919 | |
920 if (PrintAdaptiveSizePolicy && Verbose) { | |
921 gclog_or_tty->print_cr( | |
922 "CMSAdaptiveSizePolicy::adjust_eden_for_footprint " | |
923 "adjusting eden for footprint. " | |
924 " starting eden size " SIZE_FORMAT | |
925 " reduced eden size " SIZE_FORMAT | |
926 " eden delta " SIZE_FORMAT, | |
927 cur_eden, desired_eden_size, change); | |
928 } | |
929 return desired_eden_size; | |
930 } | |
931 | |
932 // The eden and promo versions should be combined if possible. | |
933 // They are the same except that the sizes of the decrement | |
934 // and increment are different for eden and promo. | |
935 size_t CMSAdaptiveSizePolicy::eden_decrement_aligned_down(size_t cur_eden) { | |
936 size_t delta = eden_decrement(cur_eden); | |
937 return align_size_down(delta, generation_alignment()); | |
938 } | |
939 | |
940 size_t CMSAdaptiveSizePolicy::eden_increment_aligned_up(size_t cur_eden) { | |
941 size_t delta = eden_increment(cur_eden); | |
942 return align_size_up(delta, generation_alignment()); | |
943 } | |
944 | |
945 size_t CMSAdaptiveSizePolicy::promo_decrement_aligned_down(size_t cur_promo) { | |
946 size_t delta = promo_decrement(cur_promo); | |
947 return align_size_down(delta, generation_alignment()); | |
948 } | |
949 | |
950 size_t CMSAdaptiveSizePolicy::promo_increment_aligned_up(size_t cur_promo) { | |
951 size_t delta = promo_increment(cur_promo); | |
952 return align_size_up(delta, generation_alignment()); | |
953 } | |
954 | |
955 | |
956 void CMSAdaptiveSizePolicy::compute_young_generation_free_space(size_t cur_eden, | |
957 size_t max_eden_size) | |
958 { | |
959 size_t desired_eden_size = cur_eden; | |
960 size_t eden_limit = max_eden_size; | |
961 | |
962 // Printout input | |
963 if (PrintGC && PrintAdaptiveSizePolicy) { | |
964 gclog_or_tty->print_cr( | |
965 "CMSAdaptiveSizePolicy::compute_young_generation_free_space: " | |
966 "cur_eden " SIZE_FORMAT, | |
967 cur_eden); | |
968 } | |
969 | |
970 // Used for diagnostics | |
971 clear_generation_free_space_flags(); | |
972 | |
973 if (_avg_minor_pause->padded_average() > gc_pause_goal_sec()) { | |
974 if (minor_pause_young_estimator()->decrement_will_decrease()) { | |
975 // If the minor pause is too long, shrink the young gen. | |
976 set_change_young_gen_for_min_pauses( | |
977 decrease_young_gen_for_min_pauses_true); | |
978 desired_eden_size = adjust_eden_for_pause_time(desired_eden_size); | |
979 } | |
980 } else if ((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) || | |
981 (avg_initial_pause()->padded_average() > gc_pause_goal_sec())) { | |
982 // The remark or initial pauses are not meeting the goal. Should | |
983 // the generation be shrunk? | |
984 if (get_and_clear_first_after_collection() && | |
985 ((avg_remark_pause()->padded_average() > gc_pause_goal_sec() && | |
986 remark_pause_young_estimator()->decrement_will_decrease()) || | |
987 (avg_initial_pause()->padded_average() > gc_pause_goal_sec() && | |
988 initial_pause_young_estimator()->decrement_will_decrease()))) { | |
989 | |
990 set_change_young_gen_for_maj_pauses( | |
991 decrease_young_gen_for_maj_pauses_true); | |
992 | |
993 // If the remark or initial pause is too long and this is the | |
994 // first young gen collection after a cms collection, shrink | |
995 // the young gen. | |
996 desired_eden_size = adjust_eden_for_pause_time(desired_eden_size); | |
997 } | |
998 // If not the first young gen collection after a cms collection, | |
999 // don't do anything. In this case an adjustment has already | |
1000 // been made and the results of the adjustment has not yet been | |
1001 // measured. | |
1002 } else if ((minor_gc_cost() >= 0.0) && | |
1003 (adjusted_mutator_cost() < _throughput_goal)) { | |
1004 desired_eden_size = adjust_eden_for_throughput(desired_eden_size); | |
1005 } else { | |
1006 desired_eden_size = adjust_eden_for_footprint(desired_eden_size); | |
1007 } | |
1008 | |
1009 if (PrintGC && PrintAdaptiveSizePolicy) { | |
1010 gclog_or_tty->print_cr( | |
1011 "CMSAdaptiveSizePolicy::compute_young_generation_free_space limits:" | |
1012 " desired_eden_size: " SIZE_FORMAT | |
1013 " old_eden_size: " SIZE_FORMAT, | |
1014 desired_eden_size, cur_eden); | |
1015 } | |
1016 | |
1017 set_eden_size(desired_eden_size); | |
1018 } | |
1019 | |
1020 size_t CMSAdaptiveSizePolicy::adjust_promo_for_pause_time(size_t cur_promo) { | |
1021 size_t change = 0; | |
1022 size_t desired_promo = cur_promo; | |
1023 // Move this test up to caller like the adjust_eden_for_pause_time() | |
1024 // call. | |
1025 if ((AdaptiveSizePausePolicy == 0) && | |
1026 ((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) || | |
1027 (avg_initial_pause()->padded_average() > gc_pause_goal_sec()))) { | |
1028 set_change_old_gen_for_maj_pauses(decrease_old_gen_for_maj_pauses_true); | |
1029 change = promo_decrement_aligned_down(cur_promo); | |
1030 desired_promo = cur_promo - change; | |
1031 } else if ((AdaptiveSizePausePolicy > 0) && | |
1032 (((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) && | |
1033 remark_pause_old_estimator()->decrement_will_decrease()) || | |
1034 ((avg_initial_pause()->padded_average() > gc_pause_goal_sec()) && | |
1035 initial_pause_old_estimator()->decrement_will_decrease()))) { | |
1036 set_change_old_gen_for_maj_pauses(decrease_old_gen_for_maj_pauses_true); | |
1037 change = promo_decrement_aligned_down(cur_promo); | |
1038 desired_promo = cur_promo - change; | |
1039 } | |
1040 | |
1041 if ((change != 0) &&PrintAdaptiveSizePolicy && Verbose) { | |
1042 gclog_or_tty->print_cr( | |
1043 "CMSAdaptiveSizePolicy::adjust_promo_for_pause_time " | |
1044 "adjusting promo for pause time. " | |
1045 " starting promo size " SIZE_FORMAT | |
1046 " reduced promo size " SIZE_FORMAT | |
1047 " promo delta " SIZE_FORMAT, | |
1048 cur_promo, desired_promo, change); | |
1049 } | |
1050 | |
1051 return desired_promo; | |
1052 } | |
1053 | |
1054 // Try to share this with PS. | |
1055 size_t CMSAdaptiveSizePolicy::scale_by_gen_gc_cost(size_t base_change, | |
1056 double gen_gc_cost) { | |
1057 | |
1058 // Calculate the change to use for the tenured gen. | |
1059 size_t scaled_change = 0; | |
1060 // Can the increment to the generation be scaled? | |
1061 if (gc_cost() >= 0.0 && gen_gc_cost >= 0.0) { | |
1062 double scale_by_ratio = gen_gc_cost / gc_cost(); | |
1063 scaled_change = | |
1064 (size_t) (scale_by_ratio * (double) base_change); | |
1065 if (PrintAdaptiveSizePolicy && Verbose) { | |
1066 gclog_or_tty->print_cr( | |
1067 "Scaled tenured increment: " SIZE_FORMAT " by %f down to " | |
1068 SIZE_FORMAT, | |
1069 base_change, scale_by_ratio, scaled_change); | |
1070 } | |
1071 } else if (gen_gc_cost >= 0.0) { | |
1072 // Scaling is not going to work. If the major gc time is the | |
1073 // larger than the other GC costs, give it a full increment. | |
1074 if (gen_gc_cost >= (gc_cost() - gen_gc_cost)) { | |
1075 scaled_change = base_change; | |
1076 } | |
1077 } else { | |
1078 // Don't expect to get here but it's ok if it does | |
1079 // in the product build since the delta will be 0 | |
1080 // and nothing will change. | |
1081 assert(false, "Unexpected value for gc costs"); | |
1082 } | |
1083 | |
1084 return scaled_change; | |
1085 } | |
1086 | |
1087 size_t CMSAdaptiveSizePolicy::adjust_promo_for_throughput(size_t cur_promo) { | |
1088 | |
1089 size_t desired_promo = cur_promo; | |
1090 | |
1091 set_change_old_gen_for_throughput(increase_old_gen_for_throughput_true); | |
1092 | |
1093 size_t change = promo_increment_aligned_up(cur_promo); | |
1094 size_t scaled_change = scale_by_gen_gc_cost(change, major_gc_cost()); | |
1095 | |
1096 if (cur_promo + scaled_change > cur_promo) { | |
1097 desired_promo = cur_promo + scaled_change; | |
1098 } | |
1099 | |
1100 _old_gen_change_for_major_throughput++; | |
1101 | |
1102 if (PrintAdaptiveSizePolicy && Verbose) { | |
1103 gclog_or_tty->print_cr( | |
1104 "CMSAdaptiveSizePolicy::adjust_promo_for_throughput " | |
1105 "adjusting promo for throughput. " | |
1106 " starting promo size " SIZE_FORMAT | |
1107 " increased promo size " SIZE_FORMAT | |
1108 " promo delta " SIZE_FORMAT, | |
1109 cur_promo, desired_promo, scaled_change); | |
1110 } | |
1111 | |
1112 return desired_promo; | |
1113 } | |
1114 | |
1115 size_t CMSAdaptiveSizePolicy::adjust_promo_for_footprint(size_t cur_promo, | |
1116 size_t cur_eden) { | |
1117 | |
1118 set_decrease_for_footprint(decrease_young_gen_for_footprint_true); | |
1119 | |
1120 size_t change = promo_decrement(cur_promo); | |
1121 size_t desired_promo_size = cur_promo - change; | |
1122 | |
1123 if (PrintAdaptiveSizePolicy && Verbose) { | |
1124 gclog_or_tty->print_cr( | |
1125 "CMSAdaptiveSizePolicy::adjust_promo_for_footprint " | |
1126 "adjusting promo for footprint. " | |
1127 " starting promo size " SIZE_FORMAT | |
1128 " reduced promo size " SIZE_FORMAT | |
1129 " promo delta " SIZE_FORMAT, | |
1130 cur_promo, desired_promo_size, change); | |
1131 } | |
1132 return desired_promo_size; | |
1133 } | |
1134 | |
1135 void CMSAdaptiveSizePolicy::compute_tenured_generation_free_space( | |
1136 size_t cur_tenured_free, | |
1137 size_t max_tenured_available, | |
1138 size_t cur_eden) { | |
1139 // This can be bad if the desired value grows/shrinks without | |
1140 // any connection to the read free space | |
1141 size_t desired_promo_size = promo_size(); | |
1142 size_t tenured_limit = max_tenured_available; | |
1143 | |
1144 // Printout input | |
1145 if (PrintGC && PrintAdaptiveSizePolicy) { | |
1146 gclog_or_tty->print_cr( | |
1147 "CMSAdaptiveSizePolicy::compute_tenured_generation_free_space: " | |
1148 "cur_tenured_free " SIZE_FORMAT | |
1149 " max_tenured_available " SIZE_FORMAT, | |
1150 cur_tenured_free, max_tenured_available); | |
1151 } | |
1152 | |
1153 // Used for diagnostics | |
1154 clear_generation_free_space_flags(); | |
1155 | |
1156 set_decide_at_full_gc(decide_at_full_gc_true); | |
1157 if (avg_remark_pause()->padded_average() > gc_pause_goal_sec() || | |
1158 avg_initial_pause()->padded_average() > gc_pause_goal_sec()) { | |
1159 desired_promo_size = adjust_promo_for_pause_time(cur_tenured_free); | |
1160 } else if (avg_minor_pause()->padded_average() > gc_pause_goal_sec()) { | |
1161 // Nothing to do since the minor collections are too large and | |
1162 // this method only deals with the cms generation. | |
1163 } else if ((cms_gc_cost() >= 0.0) && | |
1164 (adjusted_mutator_cost() < _throughput_goal)) { | |
1165 desired_promo_size = adjust_promo_for_throughput(cur_tenured_free); | |
1166 } else { | |
1167 desired_promo_size = adjust_promo_for_footprint(cur_tenured_free, | |
1168 cur_eden); | |
1169 } | |
1170 | |
1171 if (PrintGC && PrintAdaptiveSizePolicy) { | |
1172 gclog_or_tty->print_cr( | |
1173 "CMSAdaptiveSizePolicy::compute_tenured_generation_free_space limits:" | |
1174 " desired_promo_size: " SIZE_FORMAT | |
1175 " old_promo_size: " SIZE_FORMAT, | |
1176 desired_promo_size, cur_tenured_free); | |
1177 } | |
1178 | |
1179 set_promo_size(desired_promo_size); | |
1180 } | |
1181 | |
1182 int CMSAdaptiveSizePolicy::compute_survivor_space_size_and_threshold( | |
1183 bool is_survivor_overflow, | |
1184 int tenuring_threshold, | |
1185 size_t survivor_limit) { | |
1186 assert(survivor_limit >= generation_alignment(), | |
1187 "survivor_limit too small"); | |
1188 assert((size_t)align_size_down(survivor_limit, generation_alignment()) | |
1189 == survivor_limit, "survivor_limit not aligned"); | |
1190 | |
1191 // Change UsePSAdaptiveSurvivorSizePolicy -> UseAdaptiveSurvivorSizePolicy? | |
1192 if (!UsePSAdaptiveSurvivorSizePolicy || | |
1193 !young_gen_policy_is_ready()) { | |
1194 return tenuring_threshold; | |
1195 } | |
1196 | |
1197 // We'll decide whether to increase or decrease the tenuring | |
1198 // threshold based partly on the newly computed survivor size | |
1199 // (if we hit the maximum limit allowed, we'll always choose to | |
1200 // decrement the threshold). | |
1201 bool incr_tenuring_threshold = false; | |
1202 bool decr_tenuring_threshold = false; | |
1203 | |
1204 set_decrement_tenuring_threshold_for_gc_cost(false); | |
1205 set_increment_tenuring_threshold_for_gc_cost(false); | |
1206 set_decrement_tenuring_threshold_for_survivor_limit(false); | |
1207 | |
1208 if (!is_survivor_overflow) { | |
1209 // Keep running averages on how much survived | |
1210 | |
1211 // We use the tenuring threshold to equalize the cost of major | |
1212 // and minor collections. | |
1213 // ThresholdTolerance is used to indicate how sensitive the | |
1214 // tenuring threshold is to differences in cost betweent the | |
1215 // collection types. | |
1216 | |
1217 // Get the times of interest. This involves a little work, so | |
1218 // we cache the values here. | |
1219 const double major_cost = major_gc_cost(); | |
1220 const double minor_cost = minor_gc_cost(); | |
1221 | |
1222 if (minor_cost > major_cost * _threshold_tolerance_percent) { | |
1223 // Minor times are getting too long; lower the threshold so | |
1224 // less survives and more is promoted. | |
1225 decr_tenuring_threshold = true; | |
1226 set_decrement_tenuring_threshold_for_gc_cost(true); | |
1227 } else if (major_cost > minor_cost * _threshold_tolerance_percent) { | |
1228 // Major times are too long, so we want less promotion. | |
1229 incr_tenuring_threshold = true; | |
1230 set_increment_tenuring_threshold_for_gc_cost(true); | |
1231 } | |
1232 | |
1233 } else { | |
1234 // Survivor space overflow occurred, so promoted and survived are | |
1235 // not accurate. We'll make our best guess by combining survived | |
1236 // and promoted and count them as survivors. | |
1237 // | |
1238 // We'll lower the tenuring threshold to see if we can correct | |
1239 // things. Also, set the survivor size conservatively. We're | |
1240 // trying to avoid many overflows from occurring if defnew size | |
1241 // is just too small. | |
1242 | |
1243 decr_tenuring_threshold = true; | |
1244 } | |
1245 | |
1246 // The padded average also maintains a deviation from the average; | |
1247 // we use this to see how good of an estimate we have of what survived. | |
1248 // We're trying to pad the survivor size as little as possible without | |
1249 // overflowing the survivor spaces. | |
1250 size_t target_size = align_size_up((size_t)_avg_survived->padded_average(), | |
1251 generation_alignment()); | |
1252 target_size = MAX2(target_size, generation_alignment()); | |
1253 | |
1254 if (target_size > survivor_limit) { | |
1255 // Target size is bigger than we can handle. Let's also reduce | |
1256 // the tenuring threshold. | |
1257 target_size = survivor_limit; | |
1258 decr_tenuring_threshold = true; | |
1259 set_decrement_tenuring_threshold_for_survivor_limit(true); | |
1260 } | |
1261 | |
1262 // Finally, increment or decrement the tenuring threshold, as decided above. | |
1263 // We test for decrementing first, as we might have hit the target size | |
1264 // limit. | |
1265 if (decr_tenuring_threshold && !(AlwaysTenure || NeverTenure)) { | |
1266 if (tenuring_threshold > 1) { | |
1267 tenuring_threshold--; | |
1268 } | |
1269 } else if (incr_tenuring_threshold && !(AlwaysTenure || NeverTenure)) { | |
1270 if (tenuring_threshold < MaxTenuringThreshold) { | |
1271 tenuring_threshold++; | |
1272 } | |
1273 } | |
1274 | |
1275 // We keep a running average of the amount promoted which is used | |
1276 // to decide when we should collect the old generation (when | |
1277 // the amount of old gen free space is less than what we expect to | |
1278 // promote). | |
1279 | |
1280 if (PrintAdaptiveSizePolicy) { | |
1281 // A little more detail if Verbose is on | |
1282 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1283 if (Verbose) { | |
1284 gclog_or_tty->print( " avg_survived: %f" | |
1285 " avg_deviation: %f", | |
1286 _avg_survived->average(), | |
1287 _avg_survived->deviation()); | |
1288 } | |
1289 | |
1290 gclog_or_tty->print( " avg_survived_padded_avg: %f", | |
1291 _avg_survived->padded_average()); | |
1292 | |
1293 if (Verbose) { | |
1294 gclog_or_tty->print( " avg_promoted_avg: %f" | |
1295 " avg_promoted_dev: %f", | |
1296 gch->gc_stats(1)->avg_promoted()->average(), | |
1297 gch->gc_stats(1)->avg_promoted()->deviation()); | |
1298 } | |
1299 | |
1300 gclog_or_tty->print( " avg_promoted_padded_avg: %f" | |
1301 " avg_pretenured_padded_avg: %f" | |
1302 " tenuring_thresh: %d" | |
1303 " target_size: " SIZE_FORMAT | |
1304 " survivor_limit: " SIZE_FORMAT, | |
1305 gch->gc_stats(1)->avg_promoted()->padded_average(), | |
1306 _avg_pretenured->padded_average(), | |
1307 tenuring_threshold, target_size, survivor_limit); | |
1308 gclog_or_tty->cr(); | |
1309 } | |
1310 | |
1311 set_survivor_size(target_size); | |
1312 | |
1313 return tenuring_threshold; | |
1314 } | |
1315 | |
1316 bool CMSAdaptiveSizePolicy::get_and_clear_first_after_collection() { | |
1317 bool result = _first_after_collection; | |
1318 _first_after_collection = false; | |
1319 return result; | |
1320 } | |
1321 | |
1322 bool CMSAdaptiveSizePolicy::print_adaptive_size_policy_on( | |
1323 outputStream* st) const { | |
1324 | |
1325 if (!UseAdaptiveSizePolicy) return false; | |
1326 | |
1327 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1328 Generation* gen0 = gch->get_gen(0); | |
1329 DefNewGeneration* def_new = gen0->as_DefNewGeneration(); | |
1330 return | |
1331 AdaptiveSizePolicy::print_adaptive_size_policy_on( | |
1332 st, | |
1333 def_new->tenuring_threshold()); | |
1334 } |