Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.cpp @ 20357:4bfc44ba0d19
8055098: WB API should be extended to provide information about size and age of object.
Summary: Extend the WhiteBox API to provide information about the size and age of objects. Further add a mechanism to trigger a young GC.
Reviewed-by: tschatzl, sjohanss
Contributed-by: Leonid Mesnik <leonid.mesnik@oracle.com>
author | tschatzl |
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date | Thu, 21 Aug 2014 16:44:41 +0200 |
parents | bdd155477289 |
children | 8a9bb7821e28 |
rev | line source |
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0 | 1 /* |
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8007762: Rename a bunch of methods in size policy across collectors
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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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12 * version 2 for more details (a copy is included in the LICENSE file that | |
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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. | |
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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 #include "precompiled.hpp" |
26 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" | |
27 #include "gc_implementation/shared/gcStats.hpp" | |
28 #include "memory/defNewGeneration.hpp" | |
29 #include "memory/genCollectedHeap.hpp" | |
30 #include "runtime/thread.hpp" | |
31 #ifdef TARGET_OS_FAMILY_linux | |
32 # include "os_linux.inline.hpp" | |
33 #endif | |
34 #ifdef TARGET_OS_FAMILY_solaris | |
35 # include "os_solaris.inline.hpp" | |
36 #endif | |
37 #ifdef TARGET_OS_FAMILY_windows | |
38 # include "os_windows.inline.hpp" | |
39 #endif | |
14411 | 40 #ifdef TARGET_OS_FAMILY_aix |
41 # include "os_aix.inline.hpp" | |
42 #endif | |
3960 | 43 #ifdef TARGET_OS_FAMILY_bsd |
44 # include "os_bsd.inline.hpp" | |
45 #endif | |
0 | 46 elapsedTimer CMSAdaptiveSizePolicy::_concurrent_timer; |
47 elapsedTimer CMSAdaptiveSizePolicy::_STW_timer; | |
48 | |
49 // Defined if the granularity of the time measurements is potentially too large. | |
50 #define CLOCK_GRANULARITY_TOO_LARGE | |
51 | |
52 CMSAdaptiveSizePolicy::CMSAdaptiveSizePolicy(size_t init_eden_size, | |
53 size_t init_promo_size, | |
54 size_t init_survivor_size, | |
55 double max_gc_minor_pause_sec, | |
56 double max_gc_pause_sec, | |
57 uint gc_cost_ratio) : | |
58 AdaptiveSizePolicy(init_eden_size, | |
59 init_promo_size, | |
60 init_survivor_size, | |
61 max_gc_pause_sec, | |
62 gc_cost_ratio) { | |
63 | |
64 clear_internal_time_intervals(); | |
65 | |
66 _processor_count = os::active_processor_count(); | |
67 | |
1284 | 68 if (CMSConcurrentMTEnabled && (ConcGCThreads > 1)) { |
0 | 69 assert(_processor_count > 0, "Processor count is suspect"); |
1284 | 70 _concurrent_processor_count = MIN2((uint) ConcGCThreads, |
0 | 71 (uint) _processor_count); |
72 } else { | |
73 _concurrent_processor_count = 1; | |
74 } | |
75 | |
76 _avg_concurrent_time = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
77 _avg_concurrent_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
78 _avg_concurrent_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
79 | |
80 _avg_initial_pause = new AdaptivePaddedAverage(AdaptiveTimeWeight, | |
81 PausePadding); | |
82 _avg_remark_pause = new AdaptivePaddedAverage(AdaptiveTimeWeight, | |
83 PausePadding); | |
84 | |
85 _avg_cms_STW_time = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
86 _avg_cms_STW_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
87 | |
88 _avg_cms_free = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
89 _avg_cms_free_at_sweep = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
90 _avg_cms_promo = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
91 | |
92 // Mark-sweep-compact | |
93 _avg_msc_pause = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
94 _avg_msc_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
95 _avg_msc_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
96 | |
97 // Mark-sweep | |
98 _avg_ms_pause = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
99 _avg_ms_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
100 _avg_ms_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
101 | |
102 // Variables that estimate pause times as a function of generation | |
103 // size. | |
104 _remark_pause_old_estimator = | |
105 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
106 _initial_pause_old_estimator = | |
107 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
108 _remark_pause_young_estimator = | |
109 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
110 _initial_pause_young_estimator = | |
111 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
112 | |
113 // Alignment comes from that used in ReservedSpace. | |
114 _generation_alignment = os::vm_allocation_granularity(); | |
115 | |
116 // Start the concurrent timer here so that the first | |
117 // concurrent_phases_begin() measures a finite mutator | |
118 // time. A finite mutator time is used to determine | |
119 // if a concurrent collection has been started. If this | |
120 // proves to be a problem, use some explicit flag to | |
121 // signal that a concurrent collection has been started. | |
122 _concurrent_timer.start(); | |
123 _STW_timer.start(); | |
124 } | |
125 | |
126 double CMSAdaptiveSizePolicy::concurrent_processor_fraction() { | |
127 // For now assume no other daemon threads are taking alway | |
128 // cpu's from the application. | |
129 return ((double) _concurrent_processor_count / (double) _processor_count); | |
130 } | |
131 | |
132 double CMSAdaptiveSizePolicy::concurrent_collection_cost( | |
133 double interval_in_seconds) { | |
134 // When the precleaning and sweeping phases use multiple | |
135 // threads, change one_processor_fraction to | |
136 // concurrent_processor_fraction(). | |
137 double one_processor_fraction = 1.0 / ((double) processor_count()); | |
138 double concurrent_cost = | |
139 collection_cost(_latest_cms_concurrent_marking_time_secs, | |
140 interval_in_seconds) * concurrent_processor_fraction() + | |
141 collection_cost(_latest_cms_concurrent_precleaning_time_secs, | |
142 interval_in_seconds) * one_processor_fraction + | |
143 collection_cost(_latest_cms_concurrent_sweeping_time_secs, | |
144 interval_in_seconds) * one_processor_fraction; | |
145 if (PrintAdaptiveSizePolicy && Verbose) { | |
146 gclog_or_tty->print_cr( | |
147 "\nCMSAdaptiveSizePolicy::scaled_concurrent_collection_cost(%f) " | |
148 "_latest_cms_concurrent_marking_cost %f " | |
149 "_latest_cms_concurrent_precleaning_cost %f " | |
150 "_latest_cms_concurrent_sweeping_cost %f " | |
151 "concurrent_processor_fraction %f " | |
152 "concurrent_cost %f ", | |
153 interval_in_seconds, | |
154 collection_cost(_latest_cms_concurrent_marking_time_secs, | |
155 interval_in_seconds), | |
156 collection_cost(_latest_cms_concurrent_precleaning_time_secs, | |
157 interval_in_seconds), | |
158 collection_cost(_latest_cms_concurrent_sweeping_time_secs, | |
159 interval_in_seconds), | |
160 concurrent_processor_fraction(), | |
161 concurrent_cost); | |
162 } | |
163 return concurrent_cost; | |
164 } | |
165 | |
166 double CMSAdaptiveSizePolicy::concurrent_collection_time() { | |
167 double latest_cms_sum_concurrent_phases_time_secs = | |
168 _latest_cms_concurrent_marking_time_secs + | |
169 _latest_cms_concurrent_precleaning_time_secs + | |
170 _latest_cms_concurrent_sweeping_time_secs; | |
171 return latest_cms_sum_concurrent_phases_time_secs; | |
172 } | |
173 | |
174 double CMSAdaptiveSizePolicy::scaled_concurrent_collection_time() { | |
175 // When the precleaning and sweeping phases use multiple | |
176 // threads, change one_processor_fraction to | |
177 // concurrent_processor_fraction(). | |
178 double one_processor_fraction = 1.0 / ((double) processor_count()); | |
179 double latest_cms_sum_concurrent_phases_time_secs = | |
180 _latest_cms_concurrent_marking_time_secs * concurrent_processor_fraction() + | |
181 _latest_cms_concurrent_precleaning_time_secs * one_processor_fraction + | |
182 _latest_cms_concurrent_sweeping_time_secs * one_processor_fraction ; | |
183 if (PrintAdaptiveSizePolicy && Verbose) { | |
184 gclog_or_tty->print_cr( | |
185 "\nCMSAdaptiveSizePolicy::scaled_concurrent_collection_time " | |
186 "_latest_cms_concurrent_marking_time_secs %f " | |
187 "_latest_cms_concurrent_precleaning_time_secs %f " | |
188 "_latest_cms_concurrent_sweeping_time_secs %f " | |
189 "concurrent_processor_fraction %f " | |
190 "latest_cms_sum_concurrent_phases_time_secs %f ", | |
191 _latest_cms_concurrent_marking_time_secs, | |
192 _latest_cms_concurrent_precleaning_time_secs, | |
193 _latest_cms_concurrent_sweeping_time_secs, | |
194 concurrent_processor_fraction(), | |
195 latest_cms_sum_concurrent_phases_time_secs); | |
196 } | |
197 return latest_cms_sum_concurrent_phases_time_secs; | |
198 } | |
199 | |
200 void CMSAdaptiveSizePolicy::update_minor_pause_old_estimator( | |
201 double minor_pause_in_ms) { | |
202 // Get the equivalent of the free space | |
203 // that is available for promotions in the CMS generation | |
204 // and use that to update _minor_pause_old_estimator | |
205 | |
206 // Don't implement this until it is needed. A warning is | |
207 // printed if _minor_pause_old_estimator is used. | |
208 } | |
209 | |
210 void CMSAdaptiveSizePolicy::concurrent_marking_begin() { | |
211 if (PrintAdaptiveSizePolicy && Verbose) { | |
212 gclog_or_tty->print(" "); | |
213 gclog_or_tty->stamp(); | |
214 gclog_or_tty->print(": concurrent_marking_begin "); | |
215 } | |
216 // Update the interval time | |
217 _concurrent_timer.stop(); | |
218 _latest_cms_collection_end_to_collection_start_secs = _concurrent_timer.seconds(); | |
219 if (PrintAdaptiveSizePolicy && Verbose) { | |
220 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_marking_begin: " | |
221 "mutator time %f", _latest_cms_collection_end_to_collection_start_secs); | |
222 } | |
223 _concurrent_timer.reset(); | |
224 _concurrent_timer.start(); | |
225 } | |
226 | |
227 void CMSAdaptiveSizePolicy::concurrent_marking_end() { | |
228 if (PrintAdaptiveSizePolicy && Verbose) { | |
229 gclog_or_tty->stamp(); | |
230 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_marking_end()"); | |
231 } | |
232 | |
233 _concurrent_timer.stop(); | |
234 _latest_cms_concurrent_marking_time_secs = _concurrent_timer.seconds(); | |
235 | |
236 if (PrintAdaptiveSizePolicy && Verbose) { | |
237 gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_marking_end" | |
238 ":concurrent marking time (s) %f", | |
239 _latest_cms_concurrent_marking_time_secs); | |
240 } | |
241 } | |
242 | |
243 void CMSAdaptiveSizePolicy::concurrent_precleaning_begin() { | |
244 if (PrintAdaptiveSizePolicy && Verbose) { | |
245 gclog_or_tty->stamp(); | |
246 gclog_or_tty->print_cr( | |
247 "CMSAdaptiveSizePolicy::concurrent_precleaning_begin()"); | |
248 } | |
249 _concurrent_timer.reset(); | |
250 _concurrent_timer.start(); | |
251 } | |
252 | |
253 | |
254 void CMSAdaptiveSizePolicy::concurrent_precleaning_end() { | |
255 if (PrintAdaptiveSizePolicy && Verbose) { | |
256 gclog_or_tty->stamp(); | |
257 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_precleaning_end()"); | |
258 } | |
259 | |
260 _concurrent_timer.stop(); | |
261 // May be set again by a second call during the same collection. | |
262 _latest_cms_concurrent_precleaning_time_secs = _concurrent_timer.seconds(); | |
263 | |
264 if (PrintAdaptiveSizePolicy && Verbose) { | |
265 gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_precleaning_end" | |
266 ":concurrent precleaning time (s) %f", | |
267 _latest_cms_concurrent_precleaning_time_secs); | |
268 } | |
269 } | |
270 | |
271 void CMSAdaptiveSizePolicy::concurrent_sweeping_begin() { | |
272 if (PrintAdaptiveSizePolicy && Verbose) { | |
273 gclog_or_tty->stamp(); | |
274 gclog_or_tty->print_cr( | |
275 "CMSAdaptiveSizePolicy::concurrent_sweeping_begin()"); | |
276 } | |
277 _concurrent_timer.reset(); | |
278 _concurrent_timer.start(); | |
279 } | |
280 | |
281 | |
282 void CMSAdaptiveSizePolicy::concurrent_sweeping_end() { | |
283 if (PrintAdaptiveSizePolicy && Verbose) { | |
284 gclog_or_tty->stamp(); | |
285 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_sweeping_end()"); | |
286 } | |
287 | |
288 _concurrent_timer.stop(); | |
289 _latest_cms_concurrent_sweeping_time_secs = _concurrent_timer.seconds(); | |
290 | |
291 if (PrintAdaptiveSizePolicy && Verbose) { | |
292 gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_sweeping_end" | |
293 ":concurrent sweeping time (s) %f", | |
294 _latest_cms_concurrent_sweeping_time_secs); | |
295 } | |
296 } | |
297 | |
298 void CMSAdaptiveSizePolicy::concurrent_phases_end(GCCause::Cause gc_cause, | |
299 size_t cur_eden, | |
300 size_t cur_promo) { | |
301 if (PrintAdaptiveSizePolicy && Verbose) { | |
302 gclog_or_tty->print(" "); | |
303 gclog_or_tty->stamp(); | |
304 gclog_or_tty->print(": concurrent_phases_end "); | |
305 } | |
306 | |
307 // Update the concurrent timer | |
308 _concurrent_timer.stop(); | |
309 | |
310 if (gc_cause != GCCause::_java_lang_system_gc || | |
311 UseAdaptiveSizePolicyWithSystemGC) { | |
312 | |
313 avg_cms_free()->sample(cur_promo); | |
314 double latest_cms_sum_concurrent_phases_time_secs = | |
315 concurrent_collection_time(); | |
316 | |
317 _avg_concurrent_time->sample(latest_cms_sum_concurrent_phases_time_secs); | |
318 | |
319 // Cost of collection (unit-less) | |
320 | |
321 // Total interval for collection. May not be valid. Tests | |
322 // below determine whether to use this. | |
323 // | |
324 if (PrintAdaptiveSizePolicy && Verbose) { | |
325 gclog_or_tty->print_cr("\nCMSAdaptiveSizePolicy::concurrent_phases_end \n" | |
326 "_latest_cms_reset_end_to_initial_mark_start_secs %f \n" | |
327 "_latest_cms_initial_mark_start_to_end_time_secs %f \n" | |
328 "_latest_cms_remark_start_to_end_time_secs %f \n" | |
329 "_latest_cms_concurrent_marking_time_secs %f \n" | |
330 "_latest_cms_concurrent_precleaning_time_secs %f \n" | |
331 "_latest_cms_concurrent_sweeping_time_secs %f \n" | |
332 "latest_cms_sum_concurrent_phases_time_secs %f \n" | |
333 "_latest_cms_collection_end_to_collection_start_secs %f \n" | |
334 "concurrent_processor_fraction %f", | |
335 _latest_cms_reset_end_to_initial_mark_start_secs, | |
336 _latest_cms_initial_mark_start_to_end_time_secs, | |
337 _latest_cms_remark_start_to_end_time_secs, | |
338 _latest_cms_concurrent_marking_time_secs, | |
339 _latest_cms_concurrent_precleaning_time_secs, | |
340 _latest_cms_concurrent_sweeping_time_secs, | |
341 latest_cms_sum_concurrent_phases_time_secs, | |
342 _latest_cms_collection_end_to_collection_start_secs, | |
343 concurrent_processor_fraction()); | |
344 } | |
345 double interval_in_seconds = | |
346 _latest_cms_initial_mark_start_to_end_time_secs + | |
347 _latest_cms_remark_start_to_end_time_secs + | |
348 latest_cms_sum_concurrent_phases_time_secs + | |
349 _latest_cms_collection_end_to_collection_start_secs; | |
350 assert(interval_in_seconds >= 0.0, | |
351 "Bad interval between cms collections"); | |
352 | |
353 // Sample for performance counter | |
354 avg_concurrent_interval()->sample(interval_in_seconds); | |
355 | |
356 // STW costs (initial and remark pauses) | |
357 // Cost of collection (unit-less) | |
358 assert(_latest_cms_initial_mark_start_to_end_time_secs >= 0.0, | |
359 "Bad initial mark pause"); | |
360 assert(_latest_cms_remark_start_to_end_time_secs >= 0.0, | |
361 "Bad remark pause"); | |
362 double STW_time_in_seconds = | |
363 _latest_cms_initial_mark_start_to_end_time_secs + | |
364 _latest_cms_remark_start_to_end_time_secs; | |
365 double STW_collection_cost = 0.0; | |
366 if (interval_in_seconds > 0.0) { | |
367 // cost for the STW phases of the concurrent collection. | |
368 STW_collection_cost = STW_time_in_seconds / interval_in_seconds; | |
369 avg_cms_STW_gc_cost()->sample(STW_collection_cost); | |
370 } | |
371 if (PrintAdaptiveSizePolicy && Verbose) { | |
372 gclog_or_tty->print("cmsAdaptiveSizePolicy::STW_collection_end: " | |
373 "STW gc cost: %f average: %f", STW_collection_cost, | |
374 avg_cms_STW_gc_cost()->average()); | |
375 gclog_or_tty->print_cr(" STW pause: %f (ms) STW period %f (ms)", | |
376 (double) STW_time_in_seconds * MILLIUNITS, | |
377 (double) interval_in_seconds * MILLIUNITS); | |
378 } | |
379 | |
380 double concurrent_cost = 0.0; | |
381 if (latest_cms_sum_concurrent_phases_time_secs > 0.0) { | |
382 concurrent_cost = concurrent_collection_cost(interval_in_seconds); | |
383 | |
384 avg_concurrent_gc_cost()->sample(concurrent_cost); | |
385 // Average this ms cost into all the other types gc costs | |
386 | |
387 if (PrintAdaptiveSizePolicy && Verbose) { | |
388 gclog_or_tty->print("cmsAdaptiveSizePolicy::concurrent_phases_end: " | |
389 "concurrent gc cost: %f average: %f", | |
390 concurrent_cost, | |
391 _avg_concurrent_gc_cost->average()); | |
392 gclog_or_tty->print_cr(" concurrent time: %f (ms) cms period %f (ms)" | |
393 " processor fraction: %f", | |
394 latest_cms_sum_concurrent_phases_time_secs * MILLIUNITS, | |
395 interval_in_seconds * MILLIUNITS, | |
396 concurrent_processor_fraction()); | |
397 } | |
398 } | |
399 double total_collection_cost = STW_collection_cost + concurrent_cost; | |
400 avg_major_gc_cost()->sample(total_collection_cost); | |
401 | |
402 // Gather information for estimating future behavior | |
403 double initial_pause_in_ms = _latest_cms_initial_mark_start_to_end_time_secs * MILLIUNITS; | |
404 double remark_pause_in_ms = _latest_cms_remark_start_to_end_time_secs * MILLIUNITS; | |
405 | |
406 double cur_promo_size_in_mbytes = ((double)cur_promo)/((double)M); | |
407 initial_pause_old_estimator()->update(cur_promo_size_in_mbytes, | |
408 initial_pause_in_ms); | |
409 remark_pause_old_estimator()->update(cur_promo_size_in_mbytes, | |
410 remark_pause_in_ms); | |
411 major_collection_estimator()->update(cur_promo_size_in_mbytes, | |
412 total_collection_cost); | |
413 | |
414 // This estimate uses the average eden size. It could also | |
415 // have used the latest eden size. Which is better? | |
416 double cur_eden_size_in_mbytes = ((double)cur_eden)/((double) M); | |
417 initial_pause_young_estimator()->update(cur_eden_size_in_mbytes, | |
418 initial_pause_in_ms); | |
419 remark_pause_young_estimator()->update(cur_eden_size_in_mbytes, | |
420 remark_pause_in_ms); | |
421 } | |
422 | |
423 clear_internal_time_intervals(); | |
424 | |
425 set_first_after_collection(); | |
426 | |
427 // The concurrent phases keeps track of it's own mutator interval | |
428 // with this timer. This allows the stop-the-world phase to | |
429 // be included in the mutator time so that the stop-the-world time | |
430 // is not double counted. Reset and start it. | |
431 _concurrent_timer.reset(); | |
432 _concurrent_timer.start(); | |
433 | |
434 // The mutator time between STW phases does not include the | |
435 // concurrent collection time. | |
436 _STW_timer.reset(); | |
437 _STW_timer.start(); | |
438 } | |
439 | |
440 void CMSAdaptiveSizePolicy::checkpoint_roots_initial_begin() { | |
441 // Update the interval time | |
442 _STW_timer.stop(); | |
443 _latest_cms_reset_end_to_initial_mark_start_secs = _STW_timer.seconds(); | |
444 // Reset for the initial mark | |
445 _STW_timer.reset(); | |
446 _STW_timer.start(); | |
447 } | |
448 | |
449 void CMSAdaptiveSizePolicy::checkpoint_roots_initial_end( | |
450 GCCause::Cause gc_cause) { | |
451 _STW_timer.stop(); | |
452 | |
453 if (gc_cause != GCCause::_java_lang_system_gc || | |
454 UseAdaptiveSizePolicyWithSystemGC) { | |
455 _latest_cms_initial_mark_start_to_end_time_secs = _STW_timer.seconds(); | |
456 avg_initial_pause()->sample(_latest_cms_initial_mark_start_to_end_time_secs); | |
457 | |
458 if (PrintAdaptiveSizePolicy && Verbose) { | |
459 gclog_or_tty->print( | |
460 "cmsAdaptiveSizePolicy::checkpoint_roots_initial_end: " | |
461 "initial pause: %f ", _latest_cms_initial_mark_start_to_end_time_secs); | |
462 } | |
463 } | |
464 | |
465 _STW_timer.reset(); | |
466 _STW_timer.start(); | |
467 } | |
468 | |
469 void CMSAdaptiveSizePolicy::checkpoint_roots_final_begin() { | |
470 _STW_timer.stop(); | |
471 _latest_cms_initial_mark_end_to_remark_start_secs = _STW_timer.seconds(); | |
472 // Start accumumlating time for the remark in the STW timer. | |
473 _STW_timer.reset(); | |
474 _STW_timer.start(); | |
475 } | |
476 | |
477 void CMSAdaptiveSizePolicy::checkpoint_roots_final_end( | |
478 GCCause::Cause gc_cause) { | |
479 _STW_timer.stop(); | |
480 if (gc_cause != GCCause::_java_lang_system_gc || | |
481 UseAdaptiveSizePolicyWithSystemGC) { | |
482 // Total initial mark pause + remark pause. | |
483 _latest_cms_remark_start_to_end_time_secs = _STW_timer.seconds(); | |
484 double STW_time_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs + | |
485 _latest_cms_remark_start_to_end_time_secs; | |
486 double STW_time_in_ms = STW_time_in_seconds * MILLIUNITS; | |
487 | |
488 avg_remark_pause()->sample(_latest_cms_remark_start_to_end_time_secs); | |
489 | |
490 // Sample total for initial mark + remark | |
491 avg_cms_STW_time()->sample(STW_time_in_seconds); | |
492 | |
493 if (PrintAdaptiveSizePolicy && Verbose) { | |
494 gclog_or_tty->print("cmsAdaptiveSizePolicy::checkpoint_roots_final_end: " | |
495 "remark pause: %f", _latest_cms_remark_start_to_end_time_secs); | |
496 } | |
497 | |
498 } | |
499 // Don't start the STW times here because the concurrent | |
500 // sweep and reset has not happened. | |
501 // Keep the old comment above in case I don't understand | |
502 // what is going on but now | |
503 // Start the STW timer because it is used by ms_collection_begin() | |
504 // and ms_collection_end() to get the sweep time if a MS is being | |
505 // done in the foreground. | |
506 _STW_timer.reset(); | |
507 _STW_timer.start(); | |
508 } | |
509 | |
510 void CMSAdaptiveSizePolicy::msc_collection_begin() { | |
511 if (PrintAdaptiveSizePolicy && Verbose) { | |
512 gclog_or_tty->print(" "); | |
513 gclog_or_tty->stamp(); | |
514 gclog_or_tty->print(": msc_collection_begin "); | |
515 } | |
516 _STW_timer.stop(); | |
517 _latest_cms_msc_end_to_msc_start_time_secs = _STW_timer.seconds(); | |
518 if (PrintAdaptiveSizePolicy && Verbose) { | |
519 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::msc_collection_begin: " | |
520 "mutator time %f", | |
521 _latest_cms_msc_end_to_msc_start_time_secs); | |
522 } | |
523 avg_msc_interval()->sample(_latest_cms_msc_end_to_msc_start_time_secs); | |
524 _STW_timer.reset(); | |
525 _STW_timer.start(); | |
526 } | |
527 | |
528 void CMSAdaptiveSizePolicy::msc_collection_end(GCCause::Cause gc_cause) { | |
529 if (PrintAdaptiveSizePolicy && Verbose) { | |
530 gclog_or_tty->print(" "); | |
531 gclog_or_tty->stamp(); | |
532 gclog_or_tty->print(": msc_collection_end "); | |
533 } | |
534 _STW_timer.stop(); | |
535 if (gc_cause != GCCause::_java_lang_system_gc || | |
536 UseAdaptiveSizePolicyWithSystemGC) { | |
537 double msc_pause_in_seconds = _STW_timer.seconds(); | |
538 if ((_latest_cms_msc_end_to_msc_start_time_secs > 0.0) && | |
539 (msc_pause_in_seconds > 0.0)) { | |
540 avg_msc_pause()->sample(msc_pause_in_seconds); | |
541 double mutator_time_in_seconds = 0.0; | |
542 if (_latest_cms_collection_end_to_collection_start_secs == 0.0) { | |
543 // This assertion may fail because of time stamp gradularity. | |
544 // Comment it out and investiage it at a later time. The large | |
545 // time stamp granularity occurs on some older linux systems. | |
546 #ifndef CLOCK_GRANULARITY_TOO_LARGE | |
547 assert((_latest_cms_concurrent_marking_time_secs == 0.0) && | |
548 (_latest_cms_concurrent_precleaning_time_secs == 0.0) && | |
549 (_latest_cms_concurrent_sweeping_time_secs == 0.0), | |
550 "There should not be any concurrent time"); | |
551 #endif | |
552 // A concurrent collection did not start. Mutator time | |
553 // between collections comes from the STW MSC timer. | |
554 mutator_time_in_seconds = _latest_cms_msc_end_to_msc_start_time_secs; | |
555 } else { | |
556 // The concurrent collection did start so count the mutator | |
557 // time to the start of the concurrent collection. In this | |
558 // case the _latest_cms_msc_end_to_msc_start_time_secs measures | |
559 // the time between the initial mark or remark and the | |
560 // start of the MSC. That has no real meaning. | |
561 mutator_time_in_seconds = _latest_cms_collection_end_to_collection_start_secs; | |
562 } | |
563 | |
564 double latest_cms_sum_concurrent_phases_time_secs = | |
565 concurrent_collection_time(); | |
566 double interval_in_seconds = | |
567 mutator_time_in_seconds + | |
568 _latest_cms_initial_mark_start_to_end_time_secs + | |
569 _latest_cms_remark_start_to_end_time_secs + | |
570 latest_cms_sum_concurrent_phases_time_secs + | |
571 msc_pause_in_seconds; | |
572 | |
573 if (PrintAdaptiveSizePolicy && Verbose) { | |
574 gclog_or_tty->print_cr(" interval_in_seconds %f \n" | |
575 " mutator_time_in_seconds %f \n" | |
576 " _latest_cms_initial_mark_start_to_end_time_secs %f\n" | |
577 " _latest_cms_remark_start_to_end_time_secs %f\n" | |
578 " latest_cms_sum_concurrent_phases_time_secs %f\n" | |
579 " msc_pause_in_seconds %f\n", | |
580 interval_in_seconds, | |
581 mutator_time_in_seconds, | |
582 _latest_cms_initial_mark_start_to_end_time_secs, | |
583 _latest_cms_remark_start_to_end_time_secs, | |
584 latest_cms_sum_concurrent_phases_time_secs, | |
585 msc_pause_in_seconds); | |
586 } | |
587 | |
588 // The concurrent cost is wasted cost but it should be | |
589 // included. | |
590 double concurrent_cost = concurrent_collection_cost(interval_in_seconds); | |
591 | |
592 // Initial mark and remark, also wasted. | |
593 double STW_time_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs + | |
594 _latest_cms_remark_start_to_end_time_secs; | |
595 double STW_collection_cost = | |
596 collection_cost(STW_time_in_seconds, interval_in_seconds) + | |
597 concurrent_cost; | |
598 | |
599 if (PrintAdaptiveSizePolicy && Verbose) { | |
600 gclog_or_tty->print_cr(" msc_collection_end:\n" | |
601 "_latest_cms_collection_end_to_collection_start_secs %f\n" | |
602 "_latest_cms_msc_end_to_msc_start_time_secs %f\n" | |
603 "_latest_cms_initial_mark_start_to_end_time_secs %f\n" | |
604 "_latest_cms_remark_start_to_end_time_secs %f\n" | |
605 "latest_cms_sum_concurrent_phases_time_secs %f\n", | |
606 _latest_cms_collection_end_to_collection_start_secs, | |
607 _latest_cms_msc_end_to_msc_start_time_secs, | |
608 _latest_cms_initial_mark_start_to_end_time_secs, | |
609 _latest_cms_remark_start_to_end_time_secs, | |
610 latest_cms_sum_concurrent_phases_time_secs); | |
611 | |
612 gclog_or_tty->print_cr(" msc_collection_end: \n" | |
613 "latest_cms_sum_concurrent_phases_time_secs %f\n" | |
614 "STW_time_in_seconds %f\n" | |
615 "msc_pause_in_seconds %f\n", | |
616 latest_cms_sum_concurrent_phases_time_secs, | |
617 STW_time_in_seconds, | |
618 msc_pause_in_seconds); | |
619 } | |
620 | |
621 double cost = concurrent_cost + STW_collection_cost + | |
622 collection_cost(msc_pause_in_seconds, interval_in_seconds); | |
623 | |
624 _avg_msc_gc_cost->sample(cost); | |
625 | |
626 // Average this ms cost into all the other types gc costs | |
627 avg_major_gc_cost()->sample(cost); | |
628 | |
629 // Sample for performance counter | |
630 _avg_msc_interval->sample(interval_in_seconds); | |
631 if (PrintAdaptiveSizePolicy && Verbose) { | |
632 gclog_or_tty->print("cmsAdaptiveSizePolicy::msc_collection_end: " | |
633 "MSC gc cost: %f average: %f", cost, | |
634 _avg_msc_gc_cost->average()); | |
635 | |
636 double msc_pause_in_ms = msc_pause_in_seconds * MILLIUNITS; | |
637 gclog_or_tty->print_cr(" MSC pause: %f (ms) MSC period %f (ms)", | |
638 msc_pause_in_ms, (double) interval_in_seconds * MILLIUNITS); | |
639 } | |
640 } | |
641 } | |
642 | |
643 clear_internal_time_intervals(); | |
644 | |
645 // Can this call be put into the epilogue? | |
646 set_first_after_collection(); | |
647 | |
648 // The concurrent phases keeps track of it's own mutator interval | |
649 // with this timer. This allows the stop-the-world phase to | |
650 // be included in the mutator time so that the stop-the-world time | |
651 // is not double counted. Reset and start it. | |
652 _concurrent_timer.stop(); | |
653 _concurrent_timer.reset(); | |
654 _concurrent_timer.start(); | |
655 | |
656 _STW_timer.reset(); | |
657 _STW_timer.start(); | |
658 } | |
659 | |
660 void CMSAdaptiveSizePolicy::ms_collection_begin() { | |
661 if (PrintAdaptiveSizePolicy && Verbose) { | |
662 gclog_or_tty->print(" "); | |
663 gclog_or_tty->stamp(); | |
664 gclog_or_tty->print(": ms_collection_begin "); | |
665 } | |
666 _STW_timer.stop(); | |
667 _latest_cms_ms_end_to_ms_start = _STW_timer.seconds(); | |
668 if (PrintAdaptiveSizePolicy && Verbose) { | |
669 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::ms_collection_begin: " | |
670 "mutator time %f", | |
671 _latest_cms_ms_end_to_ms_start); | |
672 } | |
673 avg_ms_interval()->sample(_STW_timer.seconds()); | |
674 _STW_timer.reset(); | |
675 _STW_timer.start(); | |
676 } | |
677 | |
678 void CMSAdaptiveSizePolicy::ms_collection_end(GCCause::Cause gc_cause) { | |
679 if (PrintAdaptiveSizePolicy && Verbose) { | |
680 gclog_or_tty->print(" "); | |
681 gclog_or_tty->stamp(); | |
682 gclog_or_tty->print(": ms_collection_end "); | |
683 } | |
684 _STW_timer.stop(); | |
685 if (gc_cause != GCCause::_java_lang_system_gc || | |
686 UseAdaptiveSizePolicyWithSystemGC) { | |
687 // The MS collection is a foreground collection that does all | |
688 // the parts of a mostly concurrent collection. | |
689 // | |
690 // For this collection include the cost of the | |
691 // initial mark | |
692 // remark | |
693 // all concurrent time (scaled down by the | |
694 // concurrent_processor_fraction). Some | |
695 // may be zero if the baton was passed before | |
696 // it was reached. | |
697 // concurrent marking | |
698 // sweeping | |
699 // resetting | |
700 // STW after baton was passed (STW_in_foreground_in_seconds) | |
701 double STW_in_foreground_in_seconds = _STW_timer.seconds(); | |
702 | |
703 double latest_cms_sum_concurrent_phases_time_secs = | |
704 concurrent_collection_time(); | |
705 if (PrintAdaptiveSizePolicy && Verbose) { | |
706 gclog_or_tty->print_cr("\nCMSAdaptiveSizePolicy::ms_collecton_end " | |
707 "STW_in_foreground_in_seconds %f " | |
708 "_latest_cms_initial_mark_start_to_end_time_secs %f " | |
709 "_latest_cms_remark_start_to_end_time_secs %f " | |
710 "latest_cms_sum_concurrent_phases_time_secs %f " | |
711 "_latest_cms_ms_marking_start_to_end_time_secs %f " | |
712 "_latest_cms_ms_end_to_ms_start %f", | |
713 STW_in_foreground_in_seconds, | |
714 _latest_cms_initial_mark_start_to_end_time_secs, | |
715 _latest_cms_remark_start_to_end_time_secs, | |
716 latest_cms_sum_concurrent_phases_time_secs, | |
717 _latest_cms_ms_marking_start_to_end_time_secs, | |
718 _latest_cms_ms_end_to_ms_start); | |
719 } | |
720 | |
721 double STW_marking_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs + | |
722 _latest_cms_remark_start_to_end_time_secs; | |
723 #ifndef CLOCK_GRANULARITY_TOO_LARGE | |
724 assert(_latest_cms_ms_marking_start_to_end_time_secs == 0.0 || | |
725 latest_cms_sum_concurrent_phases_time_secs == 0.0, | |
726 "marking done twice?"); | |
727 #endif | |
728 double ms_time_in_seconds = STW_marking_in_seconds + | |
729 STW_in_foreground_in_seconds + | |
730 _latest_cms_ms_marking_start_to_end_time_secs + | |
731 scaled_concurrent_collection_time(); | |
732 avg_ms_pause()->sample(ms_time_in_seconds); | |
733 // Use the STW costs from the initial mark and remark plus | |
734 // the cost of the concurrent phase to calculate a | |
735 // collection cost. | |
736 double cost = 0.0; | |
737 if ((_latest_cms_ms_end_to_ms_start > 0.0) && | |
738 (ms_time_in_seconds > 0.0)) { | |
739 double interval_in_seconds = | |
740 _latest_cms_ms_end_to_ms_start + ms_time_in_seconds; | |
741 | |
742 if (PrintAdaptiveSizePolicy && Verbose) { | |
743 gclog_or_tty->print_cr("\n ms_time_in_seconds %f " | |
744 "latest_cms_sum_concurrent_phases_time_secs %f " | |
745 "interval_in_seconds %f", | |
746 ms_time_in_seconds, | |
747 latest_cms_sum_concurrent_phases_time_secs, | |
748 interval_in_seconds); | |
749 } | |
750 | |
751 cost = collection_cost(ms_time_in_seconds, interval_in_seconds); | |
752 | |
753 _avg_ms_gc_cost->sample(cost); | |
754 // Average this ms cost into all the other types gc costs | |
755 avg_major_gc_cost()->sample(cost); | |
756 | |
757 // Sample for performance counter | |
758 _avg_ms_interval->sample(interval_in_seconds); | |
759 } | |
760 if (PrintAdaptiveSizePolicy && Verbose) { | |
761 gclog_or_tty->print("cmsAdaptiveSizePolicy::ms_collection_end: " | |
762 "MS gc cost: %f average: %f", cost, _avg_ms_gc_cost->average()); | |
763 | |
764 double ms_time_in_ms = ms_time_in_seconds * MILLIUNITS; | |
765 gclog_or_tty->print_cr(" MS pause: %f (ms) MS period %f (ms)", | |
766 ms_time_in_ms, | |
767 _latest_cms_ms_end_to_ms_start * MILLIUNITS); | |
768 } | |
769 } | |
770 | |
771 // Consider putting this code (here to end) into a | |
772 // method for convenience. | |
773 clear_internal_time_intervals(); | |
774 | |
775 set_first_after_collection(); | |
776 | |
777 // The concurrent phases keeps track of it's own mutator interval | |
778 // with this timer. This allows the stop-the-world phase to | |
779 // be included in the mutator time so that the stop-the-world time | |
780 // is not double counted. Reset and start it. | |
781 _concurrent_timer.stop(); | |
782 _concurrent_timer.reset(); | |
783 _concurrent_timer.start(); | |
784 | |
785 _STW_timer.reset(); | |
786 _STW_timer.start(); | |
787 } | |
788 | |
789 void CMSAdaptiveSizePolicy::clear_internal_time_intervals() { | |
790 _latest_cms_reset_end_to_initial_mark_start_secs = 0.0; | |
791 _latest_cms_initial_mark_end_to_remark_start_secs = 0.0; | |
792 _latest_cms_collection_end_to_collection_start_secs = 0.0; | |
793 _latest_cms_concurrent_marking_time_secs = 0.0; | |
794 _latest_cms_concurrent_precleaning_time_secs = 0.0; | |
795 _latest_cms_concurrent_sweeping_time_secs = 0.0; | |
796 _latest_cms_msc_end_to_msc_start_time_secs = 0.0; | |
797 _latest_cms_ms_end_to_ms_start = 0.0; | |
798 _latest_cms_remark_start_to_end_time_secs = 0.0; | |
799 _latest_cms_initial_mark_start_to_end_time_secs = 0.0; | |
800 _latest_cms_ms_marking_start_to_end_time_secs = 0.0; | |
801 } | |
802 | |
803 void CMSAdaptiveSizePolicy::clear_generation_free_space_flags() { | |
804 AdaptiveSizePolicy::clear_generation_free_space_flags(); | |
805 | |
806 set_change_young_gen_for_maj_pauses(0); | |
807 } | |
808 | |
809 void CMSAdaptiveSizePolicy::concurrent_phases_resume() { | |
810 if (PrintAdaptiveSizePolicy && Verbose) { | |
811 gclog_or_tty->stamp(); | |
812 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_phases_resume()"); | |
813 } | |
814 _concurrent_timer.start(); | |
815 } | |
816 | |
817 double CMSAdaptiveSizePolicy::time_since_major_gc() const { | |
818 _concurrent_timer.stop(); | |
819 double time_since_cms_gc = _concurrent_timer.seconds(); | |
820 _concurrent_timer.start(); | |
821 _STW_timer.stop(); | |
822 double time_since_STW_gc = _STW_timer.seconds(); | |
823 _STW_timer.start(); | |
824 | |
825 return MIN2(time_since_cms_gc, time_since_STW_gc); | |
826 } | |
827 | |
828 double CMSAdaptiveSizePolicy::major_gc_interval_average_for_decay() const { | |
829 double cms_interval = _avg_concurrent_interval->average(); | |
830 double msc_interval = _avg_msc_interval->average(); | |
831 double ms_interval = _avg_ms_interval->average(); | |
832 | |
833 return MAX3(cms_interval, msc_interval, ms_interval); | |
834 } | |
835 | |
836 double CMSAdaptiveSizePolicy::cms_gc_cost() const { | |
837 return avg_major_gc_cost()->average(); | |
838 } | |
839 | |
840 void CMSAdaptiveSizePolicy::ms_collection_marking_begin() { | |
841 _STW_timer.stop(); | |
842 // Start accumumlating time for the marking in the STW timer. | |
843 _STW_timer.reset(); | |
844 _STW_timer.start(); | |
845 } | |
846 | |
847 void CMSAdaptiveSizePolicy::ms_collection_marking_end( | |
848 GCCause::Cause gc_cause) { | |
849 _STW_timer.stop(); | |
850 if (gc_cause != GCCause::_java_lang_system_gc || | |
851 UseAdaptiveSizePolicyWithSystemGC) { | |
852 _latest_cms_ms_marking_start_to_end_time_secs = _STW_timer.seconds(); | |
853 if (PrintAdaptiveSizePolicy && Verbose) { | |
854 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::" | |
855 "msc_collection_marking_end: mutator time %f", | |
856 _latest_cms_ms_marking_start_to_end_time_secs); | |
857 } | |
858 } | |
859 _STW_timer.reset(); | |
860 _STW_timer.start(); | |
861 } | |
862 | |
863 double CMSAdaptiveSizePolicy::gc_cost() const { | |
864 double cms_gen_cost = cms_gc_cost(); | |
865 double result = MIN2(1.0, minor_gc_cost() + cms_gen_cost); | |
866 assert(result >= 0.0, "Both minor and major costs are non-negative"); | |
867 return result; | |
868 } | |
869 | |
870 // Cost of collection (unit-less) | |
871 double CMSAdaptiveSizePolicy::collection_cost(double pause_in_seconds, | |
872 double interval_in_seconds) { | |
873 // Cost of collection (unit-less) | |
874 double cost = 0.0; | |
875 if ((interval_in_seconds > 0.0) && | |
876 (pause_in_seconds > 0.0)) { | |
877 cost = | |
878 pause_in_seconds / interval_in_seconds; | |
879 } | |
880 return cost; | |
881 } | |
882 | |
883 size_t CMSAdaptiveSizePolicy::adjust_eden_for_pause_time(size_t cur_eden) { | |
884 size_t change = 0; | |
885 size_t desired_eden = cur_eden; | |
886 | |
887 // reduce eden size | |
888 change = eden_decrement_aligned_down(cur_eden); | |
889 desired_eden = cur_eden - change; | |
890 | |
891 if (PrintAdaptiveSizePolicy && Verbose) { | |
892 gclog_or_tty->print_cr( | |
893 "CMSAdaptiveSizePolicy::adjust_eden_for_pause_time " | |
894 "adjusting eden for pause time. " | |
895 " starting eden size " SIZE_FORMAT | |
896 " reduced eden size " SIZE_FORMAT | |
897 " eden delta " SIZE_FORMAT, | |
898 cur_eden, desired_eden, change); | |
899 } | |
900 | |
901 return desired_eden; | |
902 } | |
903 | |
904 size_t CMSAdaptiveSizePolicy::adjust_eden_for_throughput(size_t cur_eden) { | |
905 | |
906 size_t desired_eden = cur_eden; | |
907 | |
908 set_change_young_gen_for_throughput(increase_young_gen_for_througput_true); | |
909 | |
910 size_t change = eden_increment_aligned_up(cur_eden); | |
911 size_t scaled_change = scale_by_gen_gc_cost(change, minor_gc_cost()); | |
912 | |
913 if (cur_eden + scaled_change > cur_eden) { | |
914 desired_eden = cur_eden + scaled_change; | |
915 } | |
916 | |
917 _young_gen_change_for_minor_throughput++; | |
918 | |
919 if (PrintAdaptiveSizePolicy && Verbose) { | |
920 gclog_or_tty->print_cr( | |
921 "CMSAdaptiveSizePolicy::adjust_eden_for_throughput " | |
922 "adjusting eden for throughput. " | |
923 " starting eden size " SIZE_FORMAT | |
924 " increased eden size " SIZE_FORMAT | |
925 " eden delta " SIZE_FORMAT, | |
926 cur_eden, desired_eden, scaled_change); | |
927 } | |
928 | |
929 return desired_eden; | |
930 } | |
931 | |
932 size_t CMSAdaptiveSizePolicy::adjust_eden_for_footprint(size_t cur_eden) { | |
933 | |
934 set_decrease_for_footprint(decrease_young_gen_for_footprint_true); | |
935 | |
936 size_t change = eden_decrement(cur_eden); | |
937 size_t desired_eden_size = cur_eden - change; | |
938 | |
939 if (PrintAdaptiveSizePolicy && Verbose) { | |
940 gclog_or_tty->print_cr( | |
941 "CMSAdaptiveSizePolicy::adjust_eden_for_footprint " | |
942 "adjusting eden for footprint. " | |
943 " starting eden size " SIZE_FORMAT | |
944 " reduced eden size " SIZE_FORMAT | |
945 " eden delta " SIZE_FORMAT, | |
946 cur_eden, desired_eden_size, change); | |
947 } | |
948 return desired_eden_size; | |
949 } | |
950 | |
951 // The eden and promo versions should be combined if possible. | |
952 // They are the same except that the sizes of the decrement | |
953 // and increment are different for eden and promo. | |
954 size_t CMSAdaptiveSizePolicy::eden_decrement_aligned_down(size_t cur_eden) { | |
955 size_t delta = eden_decrement(cur_eden); | |
956 return align_size_down(delta, generation_alignment()); | |
957 } | |
958 | |
959 size_t CMSAdaptiveSizePolicy::eden_increment_aligned_up(size_t cur_eden) { | |
960 size_t delta = eden_increment(cur_eden); | |
961 return align_size_up(delta, generation_alignment()); | |
962 } | |
963 | |
964 size_t CMSAdaptiveSizePolicy::promo_decrement_aligned_down(size_t cur_promo) { | |
965 size_t delta = promo_decrement(cur_promo); | |
966 return align_size_down(delta, generation_alignment()); | |
967 } | |
968 | |
969 size_t CMSAdaptiveSizePolicy::promo_increment_aligned_up(size_t cur_promo) { | |
970 size_t delta = promo_increment(cur_promo); | |
971 return align_size_up(delta, generation_alignment()); | |
972 } | |
973 | |
974 | |
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975 void CMSAdaptiveSizePolicy::compute_eden_space_size(size_t cur_eden, |
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976 size_t max_eden_size) |
0 | 977 { |
978 size_t desired_eden_size = cur_eden; | |
979 size_t eden_limit = max_eden_size; | |
980 | |
981 // Printout input | |
982 if (PrintGC && PrintAdaptiveSizePolicy) { | |
983 gclog_or_tty->print_cr( | |
10359
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984 "CMSAdaptiveSizePolicy::compute_eden_space_size: " |
0 | 985 "cur_eden " SIZE_FORMAT, |
986 cur_eden); | |
987 } | |
988 | |
989 // Used for diagnostics | |
990 clear_generation_free_space_flags(); | |
991 | |
992 if (_avg_minor_pause->padded_average() > gc_pause_goal_sec()) { | |
993 if (minor_pause_young_estimator()->decrement_will_decrease()) { | |
994 // If the minor pause is too long, shrink the young gen. | |
995 set_change_young_gen_for_min_pauses( | |
996 decrease_young_gen_for_min_pauses_true); | |
997 desired_eden_size = adjust_eden_for_pause_time(desired_eden_size); | |
998 } | |
999 } else if ((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) || | |
1000 (avg_initial_pause()->padded_average() > gc_pause_goal_sec())) { | |
1001 // The remark or initial pauses are not meeting the goal. Should | |
1002 // the generation be shrunk? | |
1003 if (get_and_clear_first_after_collection() && | |
1004 ((avg_remark_pause()->padded_average() > gc_pause_goal_sec() && | |
1005 remark_pause_young_estimator()->decrement_will_decrease()) || | |
1006 (avg_initial_pause()->padded_average() > gc_pause_goal_sec() && | |
1007 initial_pause_young_estimator()->decrement_will_decrease()))) { | |
1008 | |
1009 set_change_young_gen_for_maj_pauses( | |
1010 decrease_young_gen_for_maj_pauses_true); | |
1011 | |
1012 // If the remark or initial pause is too long and this is the | |
1013 // first young gen collection after a cms collection, shrink | |
1014 // the young gen. | |
1015 desired_eden_size = adjust_eden_for_pause_time(desired_eden_size); | |
1016 } | |
1017 // If not the first young gen collection after a cms collection, | |
1018 // don't do anything. In this case an adjustment has already | |
1019 // been made and the results of the adjustment has not yet been | |
1020 // measured. | |
1021 } else if ((minor_gc_cost() >= 0.0) && | |
1022 (adjusted_mutator_cost() < _throughput_goal)) { | |
1023 desired_eden_size = adjust_eden_for_throughput(desired_eden_size); | |
1024 } else { | |
1025 desired_eden_size = adjust_eden_for_footprint(desired_eden_size); | |
1026 } | |
1027 | |
1028 if (PrintGC && PrintAdaptiveSizePolicy) { | |
1029 gclog_or_tty->print_cr( | |
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1030 "CMSAdaptiveSizePolicy::compute_eden_space_size limits:" |
0 | 1031 " desired_eden_size: " SIZE_FORMAT |
1032 " old_eden_size: " SIZE_FORMAT, | |
1033 desired_eden_size, cur_eden); | |
1034 } | |
1035 | |
1036 set_eden_size(desired_eden_size); | |
1037 } | |
1038 | |
1039 size_t CMSAdaptiveSizePolicy::adjust_promo_for_pause_time(size_t cur_promo) { | |
1040 size_t change = 0; | |
1041 size_t desired_promo = cur_promo; | |
1042 // Move this test up to caller like the adjust_eden_for_pause_time() | |
1043 // call. | |
1044 if ((AdaptiveSizePausePolicy == 0) && | |
1045 ((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) || | |
1046 (avg_initial_pause()->padded_average() > gc_pause_goal_sec()))) { | |
1047 set_change_old_gen_for_maj_pauses(decrease_old_gen_for_maj_pauses_true); | |
1048 change = promo_decrement_aligned_down(cur_promo); | |
1049 desired_promo = cur_promo - change; | |
1050 } else if ((AdaptiveSizePausePolicy > 0) && | |
1051 (((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) && | |
1052 remark_pause_old_estimator()->decrement_will_decrease()) || | |
1053 ((avg_initial_pause()->padded_average() > gc_pause_goal_sec()) && | |
1054 initial_pause_old_estimator()->decrement_will_decrease()))) { | |
1055 set_change_old_gen_for_maj_pauses(decrease_old_gen_for_maj_pauses_true); | |
1056 change = promo_decrement_aligned_down(cur_promo); | |
1057 desired_promo = cur_promo - change; | |
1058 } | |
1059 | |
1060 if ((change != 0) &&PrintAdaptiveSizePolicy && Verbose) { | |
1061 gclog_or_tty->print_cr( | |
1062 "CMSAdaptiveSizePolicy::adjust_promo_for_pause_time " | |
1063 "adjusting promo for pause time. " | |
1064 " starting promo size " SIZE_FORMAT | |
1065 " reduced promo size " SIZE_FORMAT | |
1066 " promo delta " SIZE_FORMAT, | |
1067 cur_promo, desired_promo, change); | |
1068 } | |
1069 | |
1070 return desired_promo; | |
1071 } | |
1072 | |
1073 // Try to share this with PS. | |
1074 size_t CMSAdaptiveSizePolicy::scale_by_gen_gc_cost(size_t base_change, | |
1075 double gen_gc_cost) { | |
1076 | |
1077 // Calculate the change to use for the tenured gen. | |
1078 size_t scaled_change = 0; | |
1079 // Can the increment to the generation be scaled? | |
1080 if (gc_cost() >= 0.0 && gen_gc_cost >= 0.0) { | |
1081 double scale_by_ratio = gen_gc_cost / gc_cost(); | |
1082 scaled_change = | |
1083 (size_t) (scale_by_ratio * (double) base_change); | |
1084 if (PrintAdaptiveSizePolicy && Verbose) { | |
1085 gclog_or_tty->print_cr( | |
1086 "Scaled tenured increment: " SIZE_FORMAT " by %f down to " | |
1087 SIZE_FORMAT, | |
1088 base_change, scale_by_ratio, scaled_change); | |
1089 } | |
1090 } else if (gen_gc_cost >= 0.0) { | |
1091 // Scaling is not going to work. If the major gc time is the | |
1092 // larger than the other GC costs, give it a full increment. | |
1093 if (gen_gc_cost >= (gc_cost() - gen_gc_cost)) { | |
1094 scaled_change = base_change; | |
1095 } | |
1096 } else { | |
1097 // Don't expect to get here but it's ok if it does | |
1098 // in the product build since the delta will be 0 | |
1099 // and nothing will change. | |
1100 assert(false, "Unexpected value for gc costs"); | |
1101 } | |
1102 | |
1103 return scaled_change; | |
1104 } | |
1105 | |
1106 size_t CMSAdaptiveSizePolicy::adjust_promo_for_throughput(size_t cur_promo) { | |
1107 | |
1108 size_t desired_promo = cur_promo; | |
1109 | |
1110 set_change_old_gen_for_throughput(increase_old_gen_for_throughput_true); | |
1111 | |
1112 size_t change = promo_increment_aligned_up(cur_promo); | |
1113 size_t scaled_change = scale_by_gen_gc_cost(change, major_gc_cost()); | |
1114 | |
1115 if (cur_promo + scaled_change > cur_promo) { | |
1116 desired_promo = cur_promo + scaled_change; | |
1117 } | |
1118 | |
1119 _old_gen_change_for_major_throughput++; | |
1120 | |
1121 if (PrintAdaptiveSizePolicy && Verbose) { | |
1122 gclog_or_tty->print_cr( | |
1123 "CMSAdaptiveSizePolicy::adjust_promo_for_throughput " | |
1124 "adjusting promo for throughput. " | |
1125 " starting promo size " SIZE_FORMAT | |
1126 " increased promo size " SIZE_FORMAT | |
1127 " promo delta " SIZE_FORMAT, | |
1128 cur_promo, desired_promo, scaled_change); | |
1129 } | |
1130 | |
1131 return desired_promo; | |
1132 } | |
1133 | |
1134 size_t CMSAdaptiveSizePolicy::adjust_promo_for_footprint(size_t cur_promo, | |
1135 size_t cur_eden) { | |
1136 | |
1137 set_decrease_for_footprint(decrease_young_gen_for_footprint_true); | |
1138 | |
1139 size_t change = promo_decrement(cur_promo); | |
1140 size_t desired_promo_size = cur_promo - change; | |
1141 | |
1142 if (PrintAdaptiveSizePolicy && Verbose) { | |
1143 gclog_or_tty->print_cr( | |
1144 "CMSAdaptiveSizePolicy::adjust_promo_for_footprint " | |
1145 "adjusting promo for footprint. " | |
1146 " starting promo size " SIZE_FORMAT | |
1147 " reduced promo size " SIZE_FORMAT | |
1148 " promo delta " SIZE_FORMAT, | |
1149 cur_promo, desired_promo_size, change); | |
1150 } | |
1151 return desired_promo_size; | |
1152 } | |
1153 | |
1154 void CMSAdaptiveSizePolicy::compute_tenured_generation_free_space( | |
1155 size_t cur_tenured_free, | |
1156 size_t max_tenured_available, | |
1157 size_t cur_eden) { | |
1158 // This can be bad if the desired value grows/shrinks without | |
1159 // any connection to the read free space | |
1160 size_t desired_promo_size = promo_size(); | |
1161 size_t tenured_limit = max_tenured_available; | |
1162 | |
1163 // Printout input | |
1164 if (PrintGC && PrintAdaptiveSizePolicy) { | |
1165 gclog_or_tty->print_cr( | |
1166 "CMSAdaptiveSizePolicy::compute_tenured_generation_free_space: " | |
1167 "cur_tenured_free " SIZE_FORMAT | |
1168 " max_tenured_available " SIZE_FORMAT, | |
1169 cur_tenured_free, max_tenured_available); | |
1170 } | |
1171 | |
1172 // Used for diagnostics | |
1173 clear_generation_free_space_flags(); | |
1174 | |
1175 set_decide_at_full_gc(decide_at_full_gc_true); | |
1176 if (avg_remark_pause()->padded_average() > gc_pause_goal_sec() || | |
1177 avg_initial_pause()->padded_average() > gc_pause_goal_sec()) { | |
1178 desired_promo_size = adjust_promo_for_pause_time(cur_tenured_free); | |
1179 } else if (avg_minor_pause()->padded_average() > gc_pause_goal_sec()) { | |
1180 // Nothing to do since the minor collections are too large and | |
1181 // this method only deals with the cms generation. | |
1182 } else if ((cms_gc_cost() >= 0.0) && | |
1183 (adjusted_mutator_cost() < _throughput_goal)) { | |
1184 desired_promo_size = adjust_promo_for_throughput(cur_tenured_free); | |
1185 } else { | |
1186 desired_promo_size = adjust_promo_for_footprint(cur_tenured_free, | |
1187 cur_eden); | |
1188 } | |
1189 | |
1190 if (PrintGC && PrintAdaptiveSizePolicy) { | |
1191 gclog_or_tty->print_cr( | |
1192 "CMSAdaptiveSizePolicy::compute_tenured_generation_free_space limits:" | |
1193 " desired_promo_size: " SIZE_FORMAT | |
1194 " old_promo_size: " SIZE_FORMAT, | |
1195 desired_promo_size, cur_tenured_free); | |
1196 } | |
1197 | |
1198 set_promo_size(desired_promo_size); | |
1199 } | |
1200 | |
6818 | 1201 uint CMSAdaptiveSizePolicy::compute_survivor_space_size_and_threshold( |
0 | 1202 bool is_survivor_overflow, |
6818 | 1203 uint tenuring_threshold, |
0 | 1204 size_t survivor_limit) { |
1205 assert(survivor_limit >= generation_alignment(), | |
1206 "survivor_limit too small"); | |
1207 assert((size_t)align_size_down(survivor_limit, generation_alignment()) | |
1208 == survivor_limit, "survivor_limit not aligned"); | |
1209 | |
1210 // Change UsePSAdaptiveSurvivorSizePolicy -> UseAdaptiveSurvivorSizePolicy? | |
1211 if (!UsePSAdaptiveSurvivorSizePolicy || | |
1212 !young_gen_policy_is_ready()) { | |
1213 return tenuring_threshold; | |
1214 } | |
1215 | |
1216 // We'll decide whether to increase or decrease the tenuring | |
1217 // threshold based partly on the newly computed survivor size | |
1218 // (if we hit the maximum limit allowed, we'll always choose to | |
1219 // decrement the threshold). | |
1220 bool incr_tenuring_threshold = false; | |
1221 bool decr_tenuring_threshold = false; | |
1222 | |
1223 set_decrement_tenuring_threshold_for_gc_cost(false); | |
1224 set_increment_tenuring_threshold_for_gc_cost(false); | |
1225 set_decrement_tenuring_threshold_for_survivor_limit(false); | |
1226 | |
1227 if (!is_survivor_overflow) { | |
1228 // Keep running averages on how much survived | |
1229 | |
1230 // We use the tenuring threshold to equalize the cost of major | |
1231 // and minor collections. | |
1232 // ThresholdTolerance is used to indicate how sensitive the | |
1233 // tenuring threshold is to differences in cost betweent the | |
1234 // collection types. | |
1235 | |
1236 // Get the times of interest. This involves a little work, so | |
1237 // we cache the values here. | |
1238 const double major_cost = major_gc_cost(); | |
1239 const double minor_cost = minor_gc_cost(); | |
1240 | |
1241 if (minor_cost > major_cost * _threshold_tolerance_percent) { | |
1242 // Minor times are getting too long; lower the threshold so | |
1243 // less survives and more is promoted. | |
1244 decr_tenuring_threshold = true; | |
1245 set_decrement_tenuring_threshold_for_gc_cost(true); | |
1246 } else if (major_cost > minor_cost * _threshold_tolerance_percent) { | |
1247 // Major times are too long, so we want less promotion. | |
1248 incr_tenuring_threshold = true; | |
1249 set_increment_tenuring_threshold_for_gc_cost(true); | |
1250 } | |
1251 | |
1252 } else { | |
1253 // Survivor space overflow occurred, so promoted and survived are | |
1254 // not accurate. We'll make our best guess by combining survived | |
1255 // and promoted and count them as survivors. | |
1256 // | |
1257 // We'll lower the tenuring threshold to see if we can correct | |
1258 // things. Also, set the survivor size conservatively. We're | |
1259 // trying to avoid many overflows from occurring if defnew size | |
1260 // is just too small. | |
1261 | |
1262 decr_tenuring_threshold = true; | |
1263 } | |
1264 | |
1265 // The padded average also maintains a deviation from the average; | |
1266 // we use this to see how good of an estimate we have of what survived. | |
1267 // We're trying to pad the survivor size as little as possible without | |
1268 // overflowing the survivor spaces. | |
1269 size_t target_size = align_size_up((size_t)_avg_survived->padded_average(), | |
1270 generation_alignment()); | |
1271 target_size = MAX2(target_size, generation_alignment()); | |
1272 | |
1273 if (target_size > survivor_limit) { | |
1274 // Target size is bigger than we can handle. Let's also reduce | |
1275 // the tenuring threshold. | |
1276 target_size = survivor_limit; | |
1277 decr_tenuring_threshold = true; | |
1278 set_decrement_tenuring_threshold_for_survivor_limit(true); | |
1279 } | |
1280 | |
1281 // Finally, increment or decrement the tenuring threshold, as decided above. | |
1282 // We test for decrementing first, as we might have hit the target size | |
1283 // limit. | |
1284 if (decr_tenuring_threshold && !(AlwaysTenure || NeverTenure)) { | |
1285 if (tenuring_threshold > 1) { | |
1286 tenuring_threshold--; | |
1287 } | |
1288 } else if (incr_tenuring_threshold && !(AlwaysTenure || NeverTenure)) { | |
1289 if (tenuring_threshold < MaxTenuringThreshold) { | |
1290 tenuring_threshold++; | |
1291 } | |
1292 } | |
1293 | |
1294 // We keep a running average of the amount promoted which is used | |
1295 // to decide when we should collect the old generation (when | |
1296 // the amount of old gen free space is less than what we expect to | |
1297 // promote). | |
1298 | |
1299 if (PrintAdaptiveSizePolicy) { | |
1300 // A little more detail if Verbose is on | |
1301 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1302 if (Verbose) { | |
1303 gclog_or_tty->print( " avg_survived: %f" | |
1304 " avg_deviation: %f", | |
1305 _avg_survived->average(), | |
1306 _avg_survived->deviation()); | |
1307 } | |
1308 | |
1309 gclog_or_tty->print( " avg_survived_padded_avg: %f", | |
1310 _avg_survived->padded_average()); | |
1311 | |
1312 if (Verbose) { | |
1313 gclog_or_tty->print( " avg_promoted_avg: %f" | |
1314 " avg_promoted_dev: %f", | |
1315 gch->gc_stats(1)->avg_promoted()->average(), | |
1316 gch->gc_stats(1)->avg_promoted()->deviation()); | |
1317 } | |
1318 | |
1319 gclog_or_tty->print( " avg_promoted_padded_avg: %f" | |
1320 " avg_pretenured_padded_avg: %f" | |
6818 | 1321 " tenuring_thresh: %u" |
0 | 1322 " target_size: " SIZE_FORMAT |
1323 " survivor_limit: " SIZE_FORMAT, | |
1324 gch->gc_stats(1)->avg_promoted()->padded_average(), | |
1325 _avg_pretenured->padded_average(), | |
1326 tenuring_threshold, target_size, survivor_limit); | |
1327 gclog_or_tty->cr(); | |
1328 } | |
1329 | |
1330 set_survivor_size(target_size); | |
1331 | |
1332 return tenuring_threshold; | |
1333 } | |
1334 | |
1335 bool CMSAdaptiveSizePolicy::get_and_clear_first_after_collection() { | |
1336 bool result = _first_after_collection; | |
1337 _first_after_collection = false; | |
1338 return result; | |
1339 } | |
1340 | |
1341 bool CMSAdaptiveSizePolicy::print_adaptive_size_policy_on( | |
1342 outputStream* st) const { | |
1343 | |
1344 if (!UseAdaptiveSizePolicy) return false; | |
1345 | |
1346 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1347 Generation* gen0 = gch->get_gen(0); | |
1348 DefNewGeneration* def_new = gen0->as_DefNewGeneration(); | |
1349 return | |
1350 AdaptiveSizePolicy::print_adaptive_size_policy_on( | |
1351 st, | |
1352 def_new->tenuring_threshold()); | |
1353 } |