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annotate src/share/vm/gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.cpp @ 2400:29524004ce17
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Reviewed-by: coleenp, jrose
author | never |
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date | Fri, 25 Mar 2011 18:50:10 -0700 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #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 | |
0 | 40 elapsedTimer CMSAdaptiveSizePolicy::_concurrent_timer; |
41 elapsedTimer CMSAdaptiveSizePolicy::_STW_timer; | |
42 | |
43 // Defined if the granularity of the time measurements is potentially too large. | |
44 #define CLOCK_GRANULARITY_TOO_LARGE | |
45 | |
46 CMSAdaptiveSizePolicy::CMSAdaptiveSizePolicy(size_t init_eden_size, | |
47 size_t init_promo_size, | |
48 size_t init_survivor_size, | |
49 double max_gc_minor_pause_sec, | |
50 double max_gc_pause_sec, | |
51 uint gc_cost_ratio) : | |
52 AdaptiveSizePolicy(init_eden_size, | |
53 init_promo_size, | |
54 init_survivor_size, | |
55 max_gc_pause_sec, | |
56 gc_cost_ratio) { | |
57 | |
58 clear_internal_time_intervals(); | |
59 | |
60 _processor_count = os::active_processor_count(); | |
61 | |
1284 | 62 if (CMSConcurrentMTEnabled && (ConcGCThreads > 1)) { |
0 | 63 assert(_processor_count > 0, "Processor count is suspect"); |
1284 | 64 _concurrent_processor_count = MIN2((uint) ConcGCThreads, |
0 | 65 (uint) _processor_count); |
66 } else { | |
67 _concurrent_processor_count = 1; | |
68 } | |
69 | |
70 _avg_concurrent_time = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
71 _avg_concurrent_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
72 _avg_concurrent_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
73 | |
74 _avg_initial_pause = new AdaptivePaddedAverage(AdaptiveTimeWeight, | |
75 PausePadding); | |
76 _avg_remark_pause = new AdaptivePaddedAverage(AdaptiveTimeWeight, | |
77 PausePadding); | |
78 | |
79 _avg_cms_STW_time = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
80 _avg_cms_STW_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
81 | |
82 _avg_cms_free = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
83 _avg_cms_free_at_sweep = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
84 _avg_cms_promo = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
85 | |
86 // Mark-sweep-compact | |
87 _avg_msc_pause = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
88 _avg_msc_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
89 _avg_msc_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
90 | |
91 // Mark-sweep | |
92 _avg_ms_pause = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
93 _avg_ms_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
94 _avg_ms_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
95 | |
96 // Variables that estimate pause times as a function of generation | |
97 // size. | |
98 _remark_pause_old_estimator = | |
99 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
100 _initial_pause_old_estimator = | |
101 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
102 _remark_pause_young_estimator = | |
103 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
104 _initial_pause_young_estimator = | |
105 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
106 | |
107 // Alignment comes from that used in ReservedSpace. | |
108 _generation_alignment = os::vm_allocation_granularity(); | |
109 | |
110 // Start the concurrent timer here so that the first | |
111 // concurrent_phases_begin() measures a finite mutator | |
112 // time. A finite mutator time is used to determine | |
113 // if a concurrent collection has been started. If this | |
114 // proves to be a problem, use some explicit flag to | |
115 // signal that a concurrent collection has been started. | |
116 _concurrent_timer.start(); | |
117 _STW_timer.start(); | |
118 } | |
119 | |
120 double CMSAdaptiveSizePolicy::concurrent_processor_fraction() { | |
121 // For now assume no other daemon threads are taking alway | |
122 // cpu's from the application. | |
123 return ((double) _concurrent_processor_count / (double) _processor_count); | |
124 } | |
125 | |
126 double CMSAdaptiveSizePolicy::concurrent_collection_cost( | |
127 double interval_in_seconds) { | |
128 // When the precleaning and sweeping phases use multiple | |
129 // threads, change one_processor_fraction to | |
130 // concurrent_processor_fraction(). | |
131 double one_processor_fraction = 1.0 / ((double) processor_count()); | |
132 double concurrent_cost = | |
133 collection_cost(_latest_cms_concurrent_marking_time_secs, | |
134 interval_in_seconds) * concurrent_processor_fraction() + | |
135 collection_cost(_latest_cms_concurrent_precleaning_time_secs, | |
136 interval_in_seconds) * one_processor_fraction + | |
137 collection_cost(_latest_cms_concurrent_sweeping_time_secs, | |
138 interval_in_seconds) * one_processor_fraction; | |
139 if (PrintAdaptiveSizePolicy && Verbose) { | |
140 gclog_or_tty->print_cr( | |
141 "\nCMSAdaptiveSizePolicy::scaled_concurrent_collection_cost(%f) " | |
142 "_latest_cms_concurrent_marking_cost %f " | |
143 "_latest_cms_concurrent_precleaning_cost %f " | |
144 "_latest_cms_concurrent_sweeping_cost %f " | |
145 "concurrent_processor_fraction %f " | |
146 "concurrent_cost %f ", | |
147 interval_in_seconds, | |
148 collection_cost(_latest_cms_concurrent_marking_time_secs, | |
149 interval_in_seconds), | |
150 collection_cost(_latest_cms_concurrent_precleaning_time_secs, | |
151 interval_in_seconds), | |
152 collection_cost(_latest_cms_concurrent_sweeping_time_secs, | |
153 interval_in_seconds), | |
154 concurrent_processor_fraction(), | |
155 concurrent_cost); | |
156 } | |
157 return concurrent_cost; | |
158 } | |
159 | |
160 double CMSAdaptiveSizePolicy::concurrent_collection_time() { | |
161 double latest_cms_sum_concurrent_phases_time_secs = | |
162 _latest_cms_concurrent_marking_time_secs + | |
163 _latest_cms_concurrent_precleaning_time_secs + | |
164 _latest_cms_concurrent_sweeping_time_secs; | |
165 return latest_cms_sum_concurrent_phases_time_secs; | |
166 } | |
167 | |
168 double CMSAdaptiveSizePolicy::scaled_concurrent_collection_time() { | |
169 // When the precleaning and sweeping phases use multiple | |
170 // threads, change one_processor_fraction to | |
171 // concurrent_processor_fraction(). | |
172 double one_processor_fraction = 1.0 / ((double) processor_count()); | |
173 double latest_cms_sum_concurrent_phases_time_secs = | |
174 _latest_cms_concurrent_marking_time_secs * concurrent_processor_fraction() + | |
175 _latest_cms_concurrent_precleaning_time_secs * one_processor_fraction + | |
176 _latest_cms_concurrent_sweeping_time_secs * one_processor_fraction ; | |
177 if (PrintAdaptiveSizePolicy && Verbose) { | |
178 gclog_or_tty->print_cr( | |
179 "\nCMSAdaptiveSizePolicy::scaled_concurrent_collection_time " | |
180 "_latest_cms_concurrent_marking_time_secs %f " | |
181 "_latest_cms_concurrent_precleaning_time_secs %f " | |
182 "_latest_cms_concurrent_sweeping_time_secs %f " | |
183 "concurrent_processor_fraction %f " | |
184 "latest_cms_sum_concurrent_phases_time_secs %f ", | |
185 _latest_cms_concurrent_marking_time_secs, | |
186 _latest_cms_concurrent_precleaning_time_secs, | |
187 _latest_cms_concurrent_sweeping_time_secs, | |
188 concurrent_processor_fraction(), | |
189 latest_cms_sum_concurrent_phases_time_secs); | |
190 } | |
191 return latest_cms_sum_concurrent_phases_time_secs; | |
192 } | |
193 | |
194 void CMSAdaptiveSizePolicy::update_minor_pause_old_estimator( | |
195 double minor_pause_in_ms) { | |
196 // Get the equivalent of the free space | |
197 // that is available for promotions in the CMS generation | |
198 // and use that to update _minor_pause_old_estimator | |
199 | |
200 // Don't implement this until it is needed. A warning is | |
201 // printed if _minor_pause_old_estimator is used. | |
202 } | |
203 | |
204 void CMSAdaptiveSizePolicy::concurrent_marking_begin() { | |
205 if (PrintAdaptiveSizePolicy && Verbose) { | |
206 gclog_or_tty->print(" "); | |
207 gclog_or_tty->stamp(); | |
208 gclog_or_tty->print(": concurrent_marking_begin "); | |
209 } | |
210 // Update the interval time | |
211 _concurrent_timer.stop(); | |
212 _latest_cms_collection_end_to_collection_start_secs = _concurrent_timer.seconds(); | |
213 if (PrintAdaptiveSizePolicy && Verbose) { | |
214 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_marking_begin: " | |
215 "mutator time %f", _latest_cms_collection_end_to_collection_start_secs); | |
216 } | |
217 _concurrent_timer.reset(); | |
218 _concurrent_timer.start(); | |
219 } | |
220 | |
221 void CMSAdaptiveSizePolicy::concurrent_marking_end() { | |
222 if (PrintAdaptiveSizePolicy && Verbose) { | |
223 gclog_or_tty->stamp(); | |
224 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_marking_end()"); | |
225 } | |
226 | |
227 _concurrent_timer.stop(); | |
228 _latest_cms_concurrent_marking_time_secs = _concurrent_timer.seconds(); | |
229 | |
230 if (PrintAdaptiveSizePolicy && Verbose) { | |
231 gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_marking_end" | |
232 ":concurrent marking time (s) %f", | |
233 _latest_cms_concurrent_marking_time_secs); | |
234 } | |
235 } | |
236 | |
237 void CMSAdaptiveSizePolicy::concurrent_precleaning_begin() { | |
238 if (PrintAdaptiveSizePolicy && Verbose) { | |
239 gclog_or_tty->stamp(); | |
240 gclog_or_tty->print_cr( | |
241 "CMSAdaptiveSizePolicy::concurrent_precleaning_begin()"); | |
242 } | |
243 _concurrent_timer.reset(); | |
244 _concurrent_timer.start(); | |
245 } | |
246 | |
247 | |
248 void CMSAdaptiveSizePolicy::concurrent_precleaning_end() { | |
249 if (PrintAdaptiveSizePolicy && Verbose) { | |
250 gclog_or_tty->stamp(); | |
251 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_precleaning_end()"); | |
252 } | |
253 | |
254 _concurrent_timer.stop(); | |
255 // May be set again by a second call during the same collection. | |
256 _latest_cms_concurrent_precleaning_time_secs = _concurrent_timer.seconds(); | |
257 | |
258 if (PrintAdaptiveSizePolicy && Verbose) { | |
259 gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_precleaning_end" | |
260 ":concurrent precleaning time (s) %f", | |
261 _latest_cms_concurrent_precleaning_time_secs); | |
262 } | |
263 } | |
264 | |
265 void CMSAdaptiveSizePolicy::concurrent_sweeping_begin() { | |
266 if (PrintAdaptiveSizePolicy && Verbose) { | |
267 gclog_or_tty->stamp(); | |
268 gclog_or_tty->print_cr( | |
269 "CMSAdaptiveSizePolicy::concurrent_sweeping_begin()"); | |
270 } | |
271 _concurrent_timer.reset(); | |
272 _concurrent_timer.start(); | |
273 } | |
274 | |
275 | |
276 void CMSAdaptiveSizePolicy::concurrent_sweeping_end() { | |
277 if (PrintAdaptiveSizePolicy && Verbose) { | |
278 gclog_or_tty->stamp(); | |
279 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_sweeping_end()"); | |
280 } | |
281 | |
282 _concurrent_timer.stop(); | |
283 _latest_cms_concurrent_sweeping_time_secs = _concurrent_timer.seconds(); | |
284 | |
285 if (PrintAdaptiveSizePolicy && Verbose) { | |
286 gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_sweeping_end" | |
287 ":concurrent sweeping time (s) %f", | |
288 _latest_cms_concurrent_sweeping_time_secs); | |
289 } | |
290 } | |
291 | |
292 void CMSAdaptiveSizePolicy::concurrent_phases_end(GCCause::Cause gc_cause, | |
293 size_t cur_eden, | |
294 size_t cur_promo) { | |
295 if (PrintAdaptiveSizePolicy && Verbose) { | |
296 gclog_or_tty->print(" "); | |
297 gclog_or_tty->stamp(); | |
298 gclog_or_tty->print(": concurrent_phases_end "); | |
299 } | |
300 | |
301 // Update the concurrent timer | |
302 _concurrent_timer.stop(); | |
303 | |
304 if (gc_cause != GCCause::_java_lang_system_gc || | |
305 UseAdaptiveSizePolicyWithSystemGC) { | |
306 | |
307 avg_cms_free()->sample(cur_promo); | |
308 double latest_cms_sum_concurrent_phases_time_secs = | |
309 concurrent_collection_time(); | |
310 | |
311 _avg_concurrent_time->sample(latest_cms_sum_concurrent_phases_time_secs); | |
312 | |
313 // Cost of collection (unit-less) | |
314 | |
315 // Total interval for collection. May not be valid. Tests | |
316 // below determine whether to use this. | |
317 // | |
318 if (PrintAdaptiveSizePolicy && Verbose) { | |
319 gclog_or_tty->print_cr("\nCMSAdaptiveSizePolicy::concurrent_phases_end \n" | |
320 "_latest_cms_reset_end_to_initial_mark_start_secs %f \n" | |
321 "_latest_cms_initial_mark_start_to_end_time_secs %f \n" | |
322 "_latest_cms_remark_start_to_end_time_secs %f \n" | |
323 "_latest_cms_concurrent_marking_time_secs %f \n" | |
324 "_latest_cms_concurrent_precleaning_time_secs %f \n" | |
325 "_latest_cms_concurrent_sweeping_time_secs %f \n" | |
326 "latest_cms_sum_concurrent_phases_time_secs %f \n" | |
327 "_latest_cms_collection_end_to_collection_start_secs %f \n" | |
328 "concurrent_processor_fraction %f", | |
329 _latest_cms_reset_end_to_initial_mark_start_secs, | |
330 _latest_cms_initial_mark_start_to_end_time_secs, | |
331 _latest_cms_remark_start_to_end_time_secs, | |
332 _latest_cms_concurrent_marking_time_secs, | |
333 _latest_cms_concurrent_precleaning_time_secs, | |
334 _latest_cms_concurrent_sweeping_time_secs, | |
335 latest_cms_sum_concurrent_phases_time_secs, | |
336 _latest_cms_collection_end_to_collection_start_secs, | |
337 concurrent_processor_fraction()); | |
338 } | |
339 double interval_in_seconds = | |
340 _latest_cms_initial_mark_start_to_end_time_secs + | |
341 _latest_cms_remark_start_to_end_time_secs + | |
342 latest_cms_sum_concurrent_phases_time_secs + | |
343 _latest_cms_collection_end_to_collection_start_secs; | |
344 assert(interval_in_seconds >= 0.0, | |
345 "Bad interval between cms collections"); | |
346 | |
347 // Sample for performance counter | |
348 avg_concurrent_interval()->sample(interval_in_seconds); | |
349 | |
350 // STW costs (initial and remark pauses) | |
351 // Cost of collection (unit-less) | |
352 assert(_latest_cms_initial_mark_start_to_end_time_secs >= 0.0, | |
353 "Bad initial mark pause"); | |
354 assert(_latest_cms_remark_start_to_end_time_secs >= 0.0, | |
355 "Bad remark pause"); | |
356 double STW_time_in_seconds = | |
357 _latest_cms_initial_mark_start_to_end_time_secs + | |
358 _latest_cms_remark_start_to_end_time_secs; | |
359 double STW_collection_cost = 0.0; | |
360 if (interval_in_seconds > 0.0) { | |
361 // cost for the STW phases of the concurrent collection. | |
362 STW_collection_cost = STW_time_in_seconds / interval_in_seconds; | |
363 avg_cms_STW_gc_cost()->sample(STW_collection_cost); | |
364 } | |
365 if (PrintAdaptiveSizePolicy && Verbose) { | |
366 gclog_or_tty->print("cmsAdaptiveSizePolicy::STW_collection_end: " | |
367 "STW gc cost: %f average: %f", STW_collection_cost, | |
368 avg_cms_STW_gc_cost()->average()); | |
369 gclog_or_tty->print_cr(" STW pause: %f (ms) STW period %f (ms)", | |
370 (double) STW_time_in_seconds * MILLIUNITS, | |
371 (double) interval_in_seconds * MILLIUNITS); | |
372 } | |
373 | |
374 double concurrent_cost = 0.0; | |
375 if (latest_cms_sum_concurrent_phases_time_secs > 0.0) { | |
376 concurrent_cost = concurrent_collection_cost(interval_in_seconds); | |
377 | |
378 avg_concurrent_gc_cost()->sample(concurrent_cost); | |
379 // Average this ms cost into all the other types gc costs | |
380 | |
381 if (PrintAdaptiveSizePolicy && Verbose) { | |
382 gclog_or_tty->print("cmsAdaptiveSizePolicy::concurrent_phases_end: " | |
383 "concurrent gc cost: %f average: %f", | |
384 concurrent_cost, | |
385 _avg_concurrent_gc_cost->average()); | |
386 gclog_or_tty->print_cr(" concurrent time: %f (ms) cms period %f (ms)" | |
387 " processor fraction: %f", | |
388 latest_cms_sum_concurrent_phases_time_secs * MILLIUNITS, | |
389 interval_in_seconds * MILLIUNITS, | |
390 concurrent_processor_fraction()); | |
391 } | |
392 } | |
393 double total_collection_cost = STW_collection_cost + concurrent_cost; | |
394 avg_major_gc_cost()->sample(total_collection_cost); | |
395 | |
396 // Gather information for estimating future behavior | |
397 double initial_pause_in_ms = _latest_cms_initial_mark_start_to_end_time_secs * MILLIUNITS; | |
398 double remark_pause_in_ms = _latest_cms_remark_start_to_end_time_secs * MILLIUNITS; | |
399 | |
400 double cur_promo_size_in_mbytes = ((double)cur_promo)/((double)M); | |
401 initial_pause_old_estimator()->update(cur_promo_size_in_mbytes, | |
402 initial_pause_in_ms); | |
403 remark_pause_old_estimator()->update(cur_promo_size_in_mbytes, | |
404 remark_pause_in_ms); | |
405 major_collection_estimator()->update(cur_promo_size_in_mbytes, | |
406 total_collection_cost); | |
407 | |
408 // This estimate uses the average eden size. It could also | |
409 // have used the latest eden size. Which is better? | |
410 double cur_eden_size_in_mbytes = ((double)cur_eden)/((double) M); | |
411 initial_pause_young_estimator()->update(cur_eden_size_in_mbytes, | |
412 initial_pause_in_ms); | |
413 remark_pause_young_estimator()->update(cur_eden_size_in_mbytes, | |
414 remark_pause_in_ms); | |
415 } | |
416 | |
417 clear_internal_time_intervals(); | |
418 | |
419 set_first_after_collection(); | |
420 | |
421 // The concurrent phases keeps track of it's own mutator interval | |
422 // with this timer. This allows the stop-the-world phase to | |
423 // be included in the mutator time so that the stop-the-world time | |
424 // is not double counted. Reset and start it. | |
425 _concurrent_timer.reset(); | |
426 _concurrent_timer.start(); | |
427 | |
428 // The mutator time between STW phases does not include the | |
429 // concurrent collection time. | |
430 _STW_timer.reset(); | |
431 _STW_timer.start(); | |
432 } | |
433 | |
434 void CMSAdaptiveSizePolicy::checkpoint_roots_initial_begin() { | |
435 // Update the interval time | |
436 _STW_timer.stop(); | |
437 _latest_cms_reset_end_to_initial_mark_start_secs = _STW_timer.seconds(); | |
438 // Reset for the initial mark | |
439 _STW_timer.reset(); | |
440 _STW_timer.start(); | |
441 } | |
442 | |
443 void CMSAdaptiveSizePolicy::checkpoint_roots_initial_end( | |
444 GCCause::Cause gc_cause) { | |
445 _STW_timer.stop(); | |
446 | |
447 if (gc_cause != GCCause::_java_lang_system_gc || | |
448 UseAdaptiveSizePolicyWithSystemGC) { | |
449 _latest_cms_initial_mark_start_to_end_time_secs = _STW_timer.seconds(); | |
450 avg_initial_pause()->sample(_latest_cms_initial_mark_start_to_end_time_secs); | |
451 | |
452 if (PrintAdaptiveSizePolicy && Verbose) { | |
453 gclog_or_tty->print( | |
454 "cmsAdaptiveSizePolicy::checkpoint_roots_initial_end: " | |
455 "initial pause: %f ", _latest_cms_initial_mark_start_to_end_time_secs); | |
456 } | |
457 } | |
458 | |
459 _STW_timer.reset(); | |
460 _STW_timer.start(); | |
461 } | |
462 | |
463 void CMSAdaptiveSizePolicy::checkpoint_roots_final_begin() { | |
464 _STW_timer.stop(); | |
465 _latest_cms_initial_mark_end_to_remark_start_secs = _STW_timer.seconds(); | |
466 // Start accumumlating time for the remark in the STW timer. | |
467 _STW_timer.reset(); | |
468 _STW_timer.start(); | |
469 } | |
470 | |
471 void CMSAdaptiveSizePolicy::checkpoint_roots_final_end( | |
472 GCCause::Cause gc_cause) { | |
473 _STW_timer.stop(); | |
474 if (gc_cause != GCCause::_java_lang_system_gc || | |
475 UseAdaptiveSizePolicyWithSystemGC) { | |
476 // Total initial mark pause + remark pause. | |
477 _latest_cms_remark_start_to_end_time_secs = _STW_timer.seconds(); | |
478 double STW_time_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs + | |
479 _latest_cms_remark_start_to_end_time_secs; | |
480 double STW_time_in_ms = STW_time_in_seconds * MILLIUNITS; | |
481 | |
482 avg_remark_pause()->sample(_latest_cms_remark_start_to_end_time_secs); | |
483 | |
484 // Sample total for initial mark + remark | |
485 avg_cms_STW_time()->sample(STW_time_in_seconds); | |
486 | |
487 if (PrintAdaptiveSizePolicy && Verbose) { | |
488 gclog_or_tty->print("cmsAdaptiveSizePolicy::checkpoint_roots_final_end: " | |
489 "remark pause: %f", _latest_cms_remark_start_to_end_time_secs); | |
490 } | |
491 | |
492 } | |
493 // Don't start the STW times here because the concurrent | |
494 // sweep and reset has not happened. | |
495 // Keep the old comment above in case I don't understand | |
496 // what is going on but now | |
497 // Start the STW timer because it is used by ms_collection_begin() | |
498 // and ms_collection_end() to get the sweep time if a MS is being | |
499 // done in the foreground. | |
500 _STW_timer.reset(); | |
501 _STW_timer.start(); | |
502 } | |
503 | |
504 void CMSAdaptiveSizePolicy::msc_collection_begin() { | |
505 if (PrintAdaptiveSizePolicy && Verbose) { | |
506 gclog_or_tty->print(" "); | |
507 gclog_or_tty->stamp(); | |
508 gclog_or_tty->print(": msc_collection_begin "); | |
509 } | |
510 _STW_timer.stop(); | |
511 _latest_cms_msc_end_to_msc_start_time_secs = _STW_timer.seconds(); | |
512 if (PrintAdaptiveSizePolicy && Verbose) { | |
513 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::msc_collection_begin: " | |
514 "mutator time %f", | |
515 _latest_cms_msc_end_to_msc_start_time_secs); | |
516 } | |
517 avg_msc_interval()->sample(_latest_cms_msc_end_to_msc_start_time_secs); | |
518 _STW_timer.reset(); | |
519 _STW_timer.start(); | |
520 } | |
521 | |
522 void CMSAdaptiveSizePolicy::msc_collection_end(GCCause::Cause gc_cause) { | |
523 if (PrintAdaptiveSizePolicy && Verbose) { | |
524 gclog_or_tty->print(" "); | |
525 gclog_or_tty->stamp(); | |
526 gclog_or_tty->print(": msc_collection_end "); | |
527 } | |
528 _STW_timer.stop(); | |
529 if (gc_cause != GCCause::_java_lang_system_gc || | |
530 UseAdaptiveSizePolicyWithSystemGC) { | |
531 double msc_pause_in_seconds = _STW_timer.seconds(); | |
532 if ((_latest_cms_msc_end_to_msc_start_time_secs > 0.0) && | |
533 (msc_pause_in_seconds > 0.0)) { | |
534 avg_msc_pause()->sample(msc_pause_in_seconds); | |
535 double mutator_time_in_seconds = 0.0; | |
536 if (_latest_cms_collection_end_to_collection_start_secs == 0.0) { | |
537 // This assertion may fail because of time stamp gradularity. | |
538 // Comment it out and investiage it at a later time. The large | |
539 // time stamp granularity occurs on some older linux systems. | |
540 #ifndef CLOCK_GRANULARITY_TOO_LARGE | |
541 assert((_latest_cms_concurrent_marking_time_secs == 0.0) && | |
542 (_latest_cms_concurrent_precleaning_time_secs == 0.0) && | |
543 (_latest_cms_concurrent_sweeping_time_secs == 0.0), | |
544 "There should not be any concurrent time"); | |
545 #endif | |
546 // A concurrent collection did not start. Mutator time | |
547 // between collections comes from the STW MSC timer. | |
548 mutator_time_in_seconds = _latest_cms_msc_end_to_msc_start_time_secs; | |
549 } else { | |
550 // The concurrent collection did start so count the mutator | |
551 // time to the start of the concurrent collection. In this | |
552 // case the _latest_cms_msc_end_to_msc_start_time_secs measures | |
553 // the time between the initial mark or remark and the | |
554 // start of the MSC. That has no real meaning. | |
555 mutator_time_in_seconds = _latest_cms_collection_end_to_collection_start_secs; | |
556 } | |
557 | |
558 double latest_cms_sum_concurrent_phases_time_secs = | |
559 concurrent_collection_time(); | |
560 double interval_in_seconds = | |
561 mutator_time_in_seconds + | |
562 _latest_cms_initial_mark_start_to_end_time_secs + | |
563 _latest_cms_remark_start_to_end_time_secs + | |
564 latest_cms_sum_concurrent_phases_time_secs + | |
565 msc_pause_in_seconds; | |
566 | |
567 if (PrintAdaptiveSizePolicy && Verbose) { | |
568 gclog_or_tty->print_cr(" interval_in_seconds %f \n" | |
569 " mutator_time_in_seconds %f \n" | |
570 " _latest_cms_initial_mark_start_to_end_time_secs %f\n" | |
571 " _latest_cms_remark_start_to_end_time_secs %f\n" | |
572 " latest_cms_sum_concurrent_phases_time_secs %f\n" | |
573 " msc_pause_in_seconds %f\n", | |
574 interval_in_seconds, | |
575 mutator_time_in_seconds, | |
576 _latest_cms_initial_mark_start_to_end_time_secs, | |
577 _latest_cms_remark_start_to_end_time_secs, | |
578 latest_cms_sum_concurrent_phases_time_secs, | |
579 msc_pause_in_seconds); | |
580 } | |
581 | |
582 // The concurrent cost is wasted cost but it should be | |
583 // included. | |
584 double concurrent_cost = concurrent_collection_cost(interval_in_seconds); | |
585 | |
586 // Initial mark and remark, also wasted. | |
587 double STW_time_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs + | |
588 _latest_cms_remark_start_to_end_time_secs; | |
589 double STW_collection_cost = | |
590 collection_cost(STW_time_in_seconds, interval_in_seconds) + | |
591 concurrent_cost; | |
592 | |
593 if (PrintAdaptiveSizePolicy && Verbose) { | |
594 gclog_or_tty->print_cr(" msc_collection_end:\n" | |
595 "_latest_cms_collection_end_to_collection_start_secs %f\n" | |
596 "_latest_cms_msc_end_to_msc_start_time_secs %f\n" | |
597 "_latest_cms_initial_mark_start_to_end_time_secs %f\n" | |
598 "_latest_cms_remark_start_to_end_time_secs %f\n" | |
599 "latest_cms_sum_concurrent_phases_time_secs %f\n", | |
600 _latest_cms_collection_end_to_collection_start_secs, | |
601 _latest_cms_msc_end_to_msc_start_time_secs, | |
602 _latest_cms_initial_mark_start_to_end_time_secs, | |
603 _latest_cms_remark_start_to_end_time_secs, | |
604 latest_cms_sum_concurrent_phases_time_secs); | |
605 | |
606 gclog_or_tty->print_cr(" msc_collection_end: \n" | |
607 "latest_cms_sum_concurrent_phases_time_secs %f\n" | |
608 "STW_time_in_seconds %f\n" | |
609 "msc_pause_in_seconds %f\n", | |
610 latest_cms_sum_concurrent_phases_time_secs, | |
611 STW_time_in_seconds, | |
612 msc_pause_in_seconds); | |
613 } | |
614 | |
615 double cost = concurrent_cost + STW_collection_cost + | |
616 collection_cost(msc_pause_in_seconds, interval_in_seconds); | |
617 | |
618 _avg_msc_gc_cost->sample(cost); | |
619 | |
620 // Average this ms cost into all the other types gc costs | |
621 avg_major_gc_cost()->sample(cost); | |
622 | |
623 // Sample for performance counter | |
624 _avg_msc_interval->sample(interval_in_seconds); | |
625 if (PrintAdaptiveSizePolicy && Verbose) { | |
626 gclog_or_tty->print("cmsAdaptiveSizePolicy::msc_collection_end: " | |
627 "MSC gc cost: %f average: %f", cost, | |
628 _avg_msc_gc_cost->average()); | |
629 | |
630 double msc_pause_in_ms = msc_pause_in_seconds * MILLIUNITS; | |
631 gclog_or_tty->print_cr(" MSC pause: %f (ms) MSC period %f (ms)", | |
632 msc_pause_in_ms, (double) interval_in_seconds * MILLIUNITS); | |
633 } | |
634 } | |
635 } | |
636 | |
637 clear_internal_time_intervals(); | |
638 | |
639 // Can this call be put into the epilogue? | |
640 set_first_after_collection(); | |
641 | |
642 // The concurrent phases keeps track of it's own mutator interval | |
643 // with this timer. This allows the stop-the-world phase to | |
644 // be included in the mutator time so that the stop-the-world time | |
645 // is not double counted. Reset and start it. | |
646 _concurrent_timer.stop(); | |
647 _concurrent_timer.reset(); | |
648 _concurrent_timer.start(); | |
649 | |
650 _STW_timer.reset(); | |
651 _STW_timer.start(); | |
652 } | |
653 | |
654 void CMSAdaptiveSizePolicy::ms_collection_begin() { | |
655 if (PrintAdaptiveSizePolicy && Verbose) { | |
656 gclog_or_tty->print(" "); | |
657 gclog_or_tty->stamp(); | |
658 gclog_or_tty->print(": ms_collection_begin "); | |
659 } | |
660 _STW_timer.stop(); | |
661 _latest_cms_ms_end_to_ms_start = _STW_timer.seconds(); | |
662 if (PrintAdaptiveSizePolicy && Verbose) { | |
663 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::ms_collection_begin: " | |
664 "mutator time %f", | |
665 _latest_cms_ms_end_to_ms_start); | |
666 } | |
667 avg_ms_interval()->sample(_STW_timer.seconds()); | |
668 _STW_timer.reset(); | |
669 _STW_timer.start(); | |
670 } | |
671 | |
672 void CMSAdaptiveSizePolicy::ms_collection_end(GCCause::Cause gc_cause) { | |
673 if (PrintAdaptiveSizePolicy && Verbose) { | |
674 gclog_or_tty->print(" "); | |
675 gclog_or_tty->stamp(); | |
676 gclog_or_tty->print(": ms_collection_end "); | |
677 } | |
678 _STW_timer.stop(); | |
679 if (gc_cause != GCCause::_java_lang_system_gc || | |
680 UseAdaptiveSizePolicyWithSystemGC) { | |
681 // The MS collection is a foreground collection that does all | |
682 // the parts of a mostly concurrent collection. | |
683 // | |
684 // For this collection include the cost of the | |
685 // initial mark | |
686 // remark | |
687 // all concurrent time (scaled down by the | |
688 // concurrent_processor_fraction). Some | |
689 // may be zero if the baton was passed before | |
690 // it was reached. | |
691 // concurrent marking | |
692 // sweeping | |
693 // resetting | |
694 // STW after baton was passed (STW_in_foreground_in_seconds) | |
695 double STW_in_foreground_in_seconds = _STW_timer.seconds(); | |
696 | |
697 double latest_cms_sum_concurrent_phases_time_secs = | |
698 concurrent_collection_time(); | |
699 if (PrintAdaptiveSizePolicy && Verbose) { | |
700 gclog_or_tty->print_cr("\nCMSAdaptiveSizePolicy::ms_collecton_end " | |
701 "STW_in_foreground_in_seconds %f " | |
702 "_latest_cms_initial_mark_start_to_end_time_secs %f " | |
703 "_latest_cms_remark_start_to_end_time_secs %f " | |
704 "latest_cms_sum_concurrent_phases_time_secs %f " | |
705 "_latest_cms_ms_marking_start_to_end_time_secs %f " | |
706 "_latest_cms_ms_end_to_ms_start %f", | |
707 STW_in_foreground_in_seconds, | |
708 _latest_cms_initial_mark_start_to_end_time_secs, | |
709 _latest_cms_remark_start_to_end_time_secs, | |
710 latest_cms_sum_concurrent_phases_time_secs, | |
711 _latest_cms_ms_marking_start_to_end_time_secs, | |
712 _latest_cms_ms_end_to_ms_start); | |
713 } | |
714 | |
715 double STW_marking_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs + | |
716 _latest_cms_remark_start_to_end_time_secs; | |
717 #ifndef CLOCK_GRANULARITY_TOO_LARGE | |
718 assert(_latest_cms_ms_marking_start_to_end_time_secs == 0.0 || | |
719 latest_cms_sum_concurrent_phases_time_secs == 0.0, | |
720 "marking done twice?"); | |
721 #endif | |
722 double ms_time_in_seconds = STW_marking_in_seconds + | |
723 STW_in_foreground_in_seconds + | |
724 _latest_cms_ms_marking_start_to_end_time_secs + | |
725 scaled_concurrent_collection_time(); | |
726 avg_ms_pause()->sample(ms_time_in_seconds); | |
727 // Use the STW costs from the initial mark and remark plus | |
728 // the cost of the concurrent phase to calculate a | |
729 // collection cost. | |
730 double cost = 0.0; | |
731 if ((_latest_cms_ms_end_to_ms_start > 0.0) && | |
732 (ms_time_in_seconds > 0.0)) { | |
733 double interval_in_seconds = | |
734 _latest_cms_ms_end_to_ms_start + ms_time_in_seconds; | |
735 | |
736 if (PrintAdaptiveSizePolicy && Verbose) { | |
737 gclog_or_tty->print_cr("\n ms_time_in_seconds %f " | |
738 "latest_cms_sum_concurrent_phases_time_secs %f " | |
739 "interval_in_seconds %f", | |
740 ms_time_in_seconds, | |
741 latest_cms_sum_concurrent_phases_time_secs, | |
742 interval_in_seconds); | |
743 } | |
744 | |
745 cost = collection_cost(ms_time_in_seconds, interval_in_seconds); | |
746 | |
747 _avg_ms_gc_cost->sample(cost); | |
748 // Average this ms cost into all the other types gc costs | |
749 avg_major_gc_cost()->sample(cost); | |
750 | |
751 // Sample for performance counter | |
752 _avg_ms_interval->sample(interval_in_seconds); | |
753 } | |
754 if (PrintAdaptiveSizePolicy && Verbose) { | |
755 gclog_or_tty->print("cmsAdaptiveSizePolicy::ms_collection_end: " | |
756 "MS gc cost: %f average: %f", cost, _avg_ms_gc_cost->average()); | |
757 | |
758 double ms_time_in_ms = ms_time_in_seconds * MILLIUNITS; | |
759 gclog_or_tty->print_cr(" MS pause: %f (ms) MS period %f (ms)", | |
760 ms_time_in_ms, | |
761 _latest_cms_ms_end_to_ms_start * MILLIUNITS); | |
762 } | |
763 } | |
764 | |
765 // Consider putting this code (here to end) into a | |
766 // method for convenience. | |
767 clear_internal_time_intervals(); | |
768 | |
769 set_first_after_collection(); | |
770 | |
771 // The concurrent phases keeps track of it's own mutator interval | |
772 // with this timer. This allows the stop-the-world phase to | |
773 // be included in the mutator time so that the stop-the-world time | |
774 // is not double counted. Reset and start it. | |
775 _concurrent_timer.stop(); | |
776 _concurrent_timer.reset(); | |
777 _concurrent_timer.start(); | |
778 | |
779 _STW_timer.reset(); | |
780 _STW_timer.start(); | |
781 } | |
782 | |
783 void CMSAdaptiveSizePolicy::clear_internal_time_intervals() { | |
784 _latest_cms_reset_end_to_initial_mark_start_secs = 0.0; | |
785 _latest_cms_initial_mark_end_to_remark_start_secs = 0.0; | |
786 _latest_cms_collection_end_to_collection_start_secs = 0.0; | |
787 _latest_cms_concurrent_marking_time_secs = 0.0; | |
788 _latest_cms_concurrent_precleaning_time_secs = 0.0; | |
789 _latest_cms_concurrent_sweeping_time_secs = 0.0; | |
790 _latest_cms_msc_end_to_msc_start_time_secs = 0.0; | |
791 _latest_cms_ms_end_to_ms_start = 0.0; | |
792 _latest_cms_remark_start_to_end_time_secs = 0.0; | |
793 _latest_cms_initial_mark_start_to_end_time_secs = 0.0; | |
794 _latest_cms_ms_marking_start_to_end_time_secs = 0.0; | |
795 } | |
796 | |
797 void CMSAdaptiveSizePolicy::clear_generation_free_space_flags() { | |
798 AdaptiveSizePolicy::clear_generation_free_space_flags(); | |
799 | |
800 set_change_young_gen_for_maj_pauses(0); | |
801 } | |
802 | |
803 void CMSAdaptiveSizePolicy::concurrent_phases_resume() { | |
804 if (PrintAdaptiveSizePolicy && Verbose) { | |
805 gclog_or_tty->stamp(); | |
806 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_phases_resume()"); | |
807 } | |
808 _concurrent_timer.start(); | |
809 } | |
810 | |
811 double CMSAdaptiveSizePolicy::time_since_major_gc() const { | |
812 _concurrent_timer.stop(); | |
813 double time_since_cms_gc = _concurrent_timer.seconds(); | |
814 _concurrent_timer.start(); | |
815 _STW_timer.stop(); | |
816 double time_since_STW_gc = _STW_timer.seconds(); | |
817 _STW_timer.start(); | |
818 | |
819 return MIN2(time_since_cms_gc, time_since_STW_gc); | |
820 } | |
821 | |
822 double CMSAdaptiveSizePolicy::major_gc_interval_average_for_decay() const { | |
823 double cms_interval = _avg_concurrent_interval->average(); | |
824 double msc_interval = _avg_msc_interval->average(); | |
825 double ms_interval = _avg_ms_interval->average(); | |
826 | |
827 return MAX3(cms_interval, msc_interval, ms_interval); | |
828 } | |
829 | |
830 double CMSAdaptiveSizePolicy::cms_gc_cost() const { | |
831 return avg_major_gc_cost()->average(); | |
832 } | |
833 | |
834 void CMSAdaptiveSizePolicy::ms_collection_marking_begin() { | |
835 _STW_timer.stop(); | |
836 // Start accumumlating time for the marking in the STW timer. | |
837 _STW_timer.reset(); | |
838 _STW_timer.start(); | |
839 } | |
840 | |
841 void CMSAdaptiveSizePolicy::ms_collection_marking_end( | |
842 GCCause::Cause gc_cause) { | |
843 _STW_timer.stop(); | |
844 if (gc_cause != GCCause::_java_lang_system_gc || | |
845 UseAdaptiveSizePolicyWithSystemGC) { | |
846 _latest_cms_ms_marking_start_to_end_time_secs = _STW_timer.seconds(); | |
847 if (PrintAdaptiveSizePolicy && Verbose) { | |
848 gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::" | |
849 "msc_collection_marking_end: mutator time %f", | |
850 _latest_cms_ms_marking_start_to_end_time_secs); | |
851 } | |
852 } | |
853 _STW_timer.reset(); | |
854 _STW_timer.start(); | |
855 } | |
856 | |
857 double CMSAdaptiveSizePolicy::gc_cost() const { | |
858 double cms_gen_cost = cms_gc_cost(); | |
859 double result = MIN2(1.0, minor_gc_cost() + cms_gen_cost); | |
860 assert(result >= 0.0, "Both minor and major costs are non-negative"); | |
861 return result; | |
862 } | |
863 | |
864 // Cost of collection (unit-less) | |
865 double CMSAdaptiveSizePolicy::collection_cost(double pause_in_seconds, | |
866 double interval_in_seconds) { | |
867 // Cost of collection (unit-less) | |
868 double cost = 0.0; | |
869 if ((interval_in_seconds > 0.0) && | |
870 (pause_in_seconds > 0.0)) { | |
871 cost = | |
872 pause_in_seconds / interval_in_seconds; | |
873 } | |
874 return cost; | |
875 } | |
876 | |
877 size_t CMSAdaptiveSizePolicy::adjust_eden_for_pause_time(size_t cur_eden) { | |
878 size_t change = 0; | |
879 size_t desired_eden = cur_eden; | |
880 | |
881 // reduce eden size | |
882 change = eden_decrement_aligned_down(cur_eden); | |
883 desired_eden = cur_eden - change; | |
884 | |
885 if (PrintAdaptiveSizePolicy && Verbose) { | |
886 gclog_or_tty->print_cr( | |
887 "CMSAdaptiveSizePolicy::adjust_eden_for_pause_time " | |
888 "adjusting eden for pause time. " | |
889 " starting eden size " SIZE_FORMAT | |
890 " reduced eden size " SIZE_FORMAT | |
891 " eden delta " SIZE_FORMAT, | |
892 cur_eden, desired_eden, change); | |
893 } | |
894 | |
895 return desired_eden; | |
896 } | |
897 | |
898 size_t CMSAdaptiveSizePolicy::adjust_eden_for_throughput(size_t cur_eden) { | |
899 | |
900 size_t desired_eden = cur_eden; | |
901 | |
902 set_change_young_gen_for_throughput(increase_young_gen_for_througput_true); | |
903 | |
904 size_t change = eden_increment_aligned_up(cur_eden); | |
905 size_t scaled_change = scale_by_gen_gc_cost(change, minor_gc_cost()); | |
906 | |
907 if (cur_eden + scaled_change > cur_eden) { | |
908 desired_eden = cur_eden + scaled_change; | |
909 } | |
910 | |
911 _young_gen_change_for_minor_throughput++; | |
912 | |
913 if (PrintAdaptiveSizePolicy && Verbose) { | |
914 gclog_or_tty->print_cr( | |
915 "CMSAdaptiveSizePolicy::adjust_eden_for_throughput " | |
916 "adjusting eden for throughput. " | |
917 " starting eden size " SIZE_FORMAT | |
918 " increased eden size " SIZE_FORMAT | |
919 " eden delta " SIZE_FORMAT, | |
920 cur_eden, desired_eden, scaled_change); | |
921 } | |
922 | |
923 return desired_eden; | |
924 } | |
925 | |
926 size_t CMSAdaptiveSizePolicy::adjust_eden_for_footprint(size_t cur_eden) { | |
927 | |
928 set_decrease_for_footprint(decrease_young_gen_for_footprint_true); | |
929 | |
930 size_t change = eden_decrement(cur_eden); | |
931 size_t desired_eden_size = cur_eden - change; | |
932 | |
933 if (PrintAdaptiveSizePolicy && Verbose) { | |
934 gclog_or_tty->print_cr( | |
935 "CMSAdaptiveSizePolicy::adjust_eden_for_footprint " | |
936 "adjusting eden for footprint. " | |
937 " starting eden size " SIZE_FORMAT | |
938 " reduced eden size " SIZE_FORMAT | |
939 " eden delta " SIZE_FORMAT, | |
940 cur_eden, desired_eden_size, change); | |
941 } | |
942 return desired_eden_size; | |
943 } | |
944 | |
945 // The eden and promo versions should be combined if possible. | |
946 // They are the same except that the sizes of the decrement | |
947 // and increment are different for eden and promo. | |
948 size_t CMSAdaptiveSizePolicy::eden_decrement_aligned_down(size_t cur_eden) { | |
949 size_t delta = eden_decrement(cur_eden); | |
950 return align_size_down(delta, generation_alignment()); | |
951 } | |
952 | |
953 size_t CMSAdaptiveSizePolicy::eden_increment_aligned_up(size_t cur_eden) { | |
954 size_t delta = eden_increment(cur_eden); | |
955 return align_size_up(delta, generation_alignment()); | |
956 } | |
957 | |
958 size_t CMSAdaptiveSizePolicy::promo_decrement_aligned_down(size_t cur_promo) { | |
959 size_t delta = promo_decrement(cur_promo); | |
960 return align_size_down(delta, generation_alignment()); | |
961 } | |
962 | |
963 size_t CMSAdaptiveSizePolicy::promo_increment_aligned_up(size_t cur_promo) { | |
964 size_t delta = promo_increment(cur_promo); | |
965 return align_size_up(delta, generation_alignment()); | |
966 } | |
967 | |
968 | |
969 void CMSAdaptiveSizePolicy::compute_young_generation_free_space(size_t cur_eden, | |
970 size_t max_eden_size) | |
971 { | |
972 size_t desired_eden_size = cur_eden; | |
973 size_t eden_limit = max_eden_size; | |
974 | |
975 // Printout input | |
976 if (PrintGC && PrintAdaptiveSizePolicy) { | |
977 gclog_or_tty->print_cr( | |
978 "CMSAdaptiveSizePolicy::compute_young_generation_free_space: " | |
979 "cur_eden " SIZE_FORMAT, | |
980 cur_eden); | |
981 } | |
982 | |
983 // Used for diagnostics | |
984 clear_generation_free_space_flags(); | |
985 | |
986 if (_avg_minor_pause->padded_average() > gc_pause_goal_sec()) { | |
987 if (minor_pause_young_estimator()->decrement_will_decrease()) { | |
988 // If the minor pause is too long, shrink the young gen. | |
989 set_change_young_gen_for_min_pauses( | |
990 decrease_young_gen_for_min_pauses_true); | |
991 desired_eden_size = adjust_eden_for_pause_time(desired_eden_size); | |
992 } | |
993 } else if ((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) || | |
994 (avg_initial_pause()->padded_average() > gc_pause_goal_sec())) { | |
995 // The remark or initial pauses are not meeting the goal. Should | |
996 // the generation be shrunk? | |
997 if (get_and_clear_first_after_collection() && | |
998 ((avg_remark_pause()->padded_average() > gc_pause_goal_sec() && | |
999 remark_pause_young_estimator()->decrement_will_decrease()) || | |
1000 (avg_initial_pause()->padded_average() > gc_pause_goal_sec() && | |
1001 initial_pause_young_estimator()->decrement_will_decrease()))) { | |
1002 | |
1003 set_change_young_gen_for_maj_pauses( | |
1004 decrease_young_gen_for_maj_pauses_true); | |
1005 | |
1006 // If the remark or initial pause is too long and this is the | |
1007 // first young gen collection after a cms collection, shrink | |
1008 // the young gen. | |
1009 desired_eden_size = adjust_eden_for_pause_time(desired_eden_size); | |
1010 } | |
1011 // If not the first young gen collection after a cms collection, | |
1012 // don't do anything. In this case an adjustment has already | |
1013 // been made and the results of the adjustment has not yet been | |
1014 // measured. | |
1015 } else if ((minor_gc_cost() >= 0.0) && | |
1016 (adjusted_mutator_cost() < _throughput_goal)) { | |
1017 desired_eden_size = adjust_eden_for_throughput(desired_eden_size); | |
1018 } else { | |
1019 desired_eden_size = adjust_eden_for_footprint(desired_eden_size); | |
1020 } | |
1021 | |
1022 if (PrintGC && PrintAdaptiveSizePolicy) { | |
1023 gclog_or_tty->print_cr( | |
1024 "CMSAdaptiveSizePolicy::compute_young_generation_free_space limits:" | |
1025 " desired_eden_size: " SIZE_FORMAT | |
1026 " old_eden_size: " SIZE_FORMAT, | |
1027 desired_eden_size, cur_eden); | |
1028 } | |
1029 | |
1030 set_eden_size(desired_eden_size); | |
1031 } | |
1032 | |
1033 size_t CMSAdaptiveSizePolicy::adjust_promo_for_pause_time(size_t cur_promo) { | |
1034 size_t change = 0; | |
1035 size_t desired_promo = cur_promo; | |
1036 // Move this test up to caller like the adjust_eden_for_pause_time() | |
1037 // call. | |
1038 if ((AdaptiveSizePausePolicy == 0) && | |
1039 ((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) || | |
1040 (avg_initial_pause()->padded_average() > gc_pause_goal_sec()))) { | |
1041 set_change_old_gen_for_maj_pauses(decrease_old_gen_for_maj_pauses_true); | |
1042 change = promo_decrement_aligned_down(cur_promo); | |
1043 desired_promo = cur_promo - change; | |
1044 } else if ((AdaptiveSizePausePolicy > 0) && | |
1045 (((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) && | |
1046 remark_pause_old_estimator()->decrement_will_decrease()) || | |
1047 ((avg_initial_pause()->padded_average() > gc_pause_goal_sec()) && | |
1048 initial_pause_old_estimator()->decrement_will_decrease()))) { | |
1049 set_change_old_gen_for_maj_pauses(decrease_old_gen_for_maj_pauses_true); | |
1050 change = promo_decrement_aligned_down(cur_promo); | |
1051 desired_promo = cur_promo - change; | |
1052 } | |
1053 | |
1054 if ((change != 0) &&PrintAdaptiveSizePolicy && Verbose) { | |
1055 gclog_or_tty->print_cr( | |
1056 "CMSAdaptiveSizePolicy::adjust_promo_for_pause_time " | |
1057 "adjusting promo for pause time. " | |
1058 " starting promo size " SIZE_FORMAT | |
1059 " reduced promo size " SIZE_FORMAT | |
1060 " promo delta " SIZE_FORMAT, | |
1061 cur_promo, desired_promo, change); | |
1062 } | |
1063 | |
1064 return desired_promo; | |
1065 } | |
1066 | |
1067 // Try to share this with PS. | |
1068 size_t CMSAdaptiveSizePolicy::scale_by_gen_gc_cost(size_t base_change, | |
1069 double gen_gc_cost) { | |
1070 | |
1071 // Calculate the change to use for the tenured gen. | |
1072 size_t scaled_change = 0; | |
1073 // Can the increment to the generation be scaled? | |
1074 if (gc_cost() >= 0.0 && gen_gc_cost >= 0.0) { | |
1075 double scale_by_ratio = gen_gc_cost / gc_cost(); | |
1076 scaled_change = | |
1077 (size_t) (scale_by_ratio * (double) base_change); | |
1078 if (PrintAdaptiveSizePolicy && Verbose) { | |
1079 gclog_or_tty->print_cr( | |
1080 "Scaled tenured increment: " SIZE_FORMAT " by %f down to " | |
1081 SIZE_FORMAT, | |
1082 base_change, scale_by_ratio, scaled_change); | |
1083 } | |
1084 } else if (gen_gc_cost >= 0.0) { | |
1085 // Scaling is not going to work. If the major gc time is the | |
1086 // larger than the other GC costs, give it a full increment. | |
1087 if (gen_gc_cost >= (gc_cost() - gen_gc_cost)) { | |
1088 scaled_change = base_change; | |
1089 } | |
1090 } else { | |
1091 // Don't expect to get here but it's ok if it does | |
1092 // in the product build since the delta will be 0 | |
1093 // and nothing will change. | |
1094 assert(false, "Unexpected value for gc costs"); | |
1095 } | |
1096 | |
1097 return scaled_change; | |
1098 } | |
1099 | |
1100 size_t CMSAdaptiveSizePolicy::adjust_promo_for_throughput(size_t cur_promo) { | |
1101 | |
1102 size_t desired_promo = cur_promo; | |
1103 | |
1104 set_change_old_gen_for_throughput(increase_old_gen_for_throughput_true); | |
1105 | |
1106 size_t change = promo_increment_aligned_up(cur_promo); | |
1107 size_t scaled_change = scale_by_gen_gc_cost(change, major_gc_cost()); | |
1108 | |
1109 if (cur_promo + scaled_change > cur_promo) { | |
1110 desired_promo = cur_promo + scaled_change; | |
1111 } | |
1112 | |
1113 _old_gen_change_for_major_throughput++; | |
1114 | |
1115 if (PrintAdaptiveSizePolicy && Verbose) { | |
1116 gclog_or_tty->print_cr( | |
1117 "CMSAdaptiveSizePolicy::adjust_promo_for_throughput " | |
1118 "adjusting promo for throughput. " | |
1119 " starting promo size " SIZE_FORMAT | |
1120 " increased promo size " SIZE_FORMAT | |
1121 " promo delta " SIZE_FORMAT, | |
1122 cur_promo, desired_promo, scaled_change); | |
1123 } | |
1124 | |
1125 return desired_promo; | |
1126 } | |
1127 | |
1128 size_t CMSAdaptiveSizePolicy::adjust_promo_for_footprint(size_t cur_promo, | |
1129 size_t cur_eden) { | |
1130 | |
1131 set_decrease_for_footprint(decrease_young_gen_for_footprint_true); | |
1132 | |
1133 size_t change = promo_decrement(cur_promo); | |
1134 size_t desired_promo_size = cur_promo - change; | |
1135 | |
1136 if (PrintAdaptiveSizePolicy && Verbose) { | |
1137 gclog_or_tty->print_cr( | |
1138 "CMSAdaptiveSizePolicy::adjust_promo_for_footprint " | |
1139 "adjusting promo for footprint. " | |
1140 " starting promo size " SIZE_FORMAT | |
1141 " reduced promo size " SIZE_FORMAT | |
1142 " promo delta " SIZE_FORMAT, | |
1143 cur_promo, desired_promo_size, change); | |
1144 } | |
1145 return desired_promo_size; | |
1146 } | |
1147 | |
1148 void CMSAdaptiveSizePolicy::compute_tenured_generation_free_space( | |
1149 size_t cur_tenured_free, | |
1150 size_t max_tenured_available, | |
1151 size_t cur_eden) { | |
1152 // This can be bad if the desired value grows/shrinks without | |
1153 // any connection to the read free space | |
1154 size_t desired_promo_size = promo_size(); | |
1155 size_t tenured_limit = max_tenured_available; | |
1156 | |
1157 // Printout input | |
1158 if (PrintGC && PrintAdaptiveSizePolicy) { | |
1159 gclog_or_tty->print_cr( | |
1160 "CMSAdaptiveSizePolicy::compute_tenured_generation_free_space: " | |
1161 "cur_tenured_free " SIZE_FORMAT | |
1162 " max_tenured_available " SIZE_FORMAT, | |
1163 cur_tenured_free, max_tenured_available); | |
1164 } | |
1165 | |
1166 // Used for diagnostics | |
1167 clear_generation_free_space_flags(); | |
1168 | |
1169 set_decide_at_full_gc(decide_at_full_gc_true); | |
1170 if (avg_remark_pause()->padded_average() > gc_pause_goal_sec() || | |
1171 avg_initial_pause()->padded_average() > gc_pause_goal_sec()) { | |
1172 desired_promo_size = adjust_promo_for_pause_time(cur_tenured_free); | |
1173 } else if (avg_minor_pause()->padded_average() > gc_pause_goal_sec()) { | |
1174 // Nothing to do since the minor collections are too large and | |
1175 // this method only deals with the cms generation. | |
1176 } else if ((cms_gc_cost() >= 0.0) && | |
1177 (adjusted_mutator_cost() < _throughput_goal)) { | |
1178 desired_promo_size = adjust_promo_for_throughput(cur_tenured_free); | |
1179 } else { | |
1180 desired_promo_size = adjust_promo_for_footprint(cur_tenured_free, | |
1181 cur_eden); | |
1182 } | |
1183 | |
1184 if (PrintGC && PrintAdaptiveSizePolicy) { | |
1185 gclog_or_tty->print_cr( | |
1186 "CMSAdaptiveSizePolicy::compute_tenured_generation_free_space limits:" | |
1187 " desired_promo_size: " SIZE_FORMAT | |
1188 " old_promo_size: " SIZE_FORMAT, | |
1189 desired_promo_size, cur_tenured_free); | |
1190 } | |
1191 | |
1192 set_promo_size(desired_promo_size); | |
1193 } | |
1194 | |
1195 int CMSAdaptiveSizePolicy::compute_survivor_space_size_and_threshold( | |
1196 bool is_survivor_overflow, | |
1197 int tenuring_threshold, | |
1198 size_t survivor_limit) { | |
1199 assert(survivor_limit >= generation_alignment(), | |
1200 "survivor_limit too small"); | |
1201 assert((size_t)align_size_down(survivor_limit, generation_alignment()) | |
1202 == survivor_limit, "survivor_limit not aligned"); | |
1203 | |
1204 // Change UsePSAdaptiveSurvivorSizePolicy -> UseAdaptiveSurvivorSizePolicy? | |
1205 if (!UsePSAdaptiveSurvivorSizePolicy || | |
1206 !young_gen_policy_is_ready()) { | |
1207 return tenuring_threshold; | |
1208 } | |
1209 | |
1210 // We'll decide whether to increase or decrease the tenuring | |
1211 // threshold based partly on the newly computed survivor size | |
1212 // (if we hit the maximum limit allowed, we'll always choose to | |
1213 // decrement the threshold). | |
1214 bool incr_tenuring_threshold = false; | |
1215 bool decr_tenuring_threshold = false; | |
1216 | |
1217 set_decrement_tenuring_threshold_for_gc_cost(false); | |
1218 set_increment_tenuring_threshold_for_gc_cost(false); | |
1219 set_decrement_tenuring_threshold_for_survivor_limit(false); | |
1220 | |
1221 if (!is_survivor_overflow) { | |
1222 // Keep running averages on how much survived | |
1223 | |
1224 // We use the tenuring threshold to equalize the cost of major | |
1225 // and minor collections. | |
1226 // ThresholdTolerance is used to indicate how sensitive the | |
1227 // tenuring threshold is to differences in cost betweent the | |
1228 // collection types. | |
1229 | |
1230 // Get the times of interest. This involves a little work, so | |
1231 // we cache the values here. | |
1232 const double major_cost = major_gc_cost(); | |
1233 const double minor_cost = minor_gc_cost(); | |
1234 | |
1235 if (minor_cost > major_cost * _threshold_tolerance_percent) { | |
1236 // Minor times are getting too long; lower the threshold so | |
1237 // less survives and more is promoted. | |
1238 decr_tenuring_threshold = true; | |
1239 set_decrement_tenuring_threshold_for_gc_cost(true); | |
1240 } else if (major_cost > minor_cost * _threshold_tolerance_percent) { | |
1241 // Major times are too long, so we want less promotion. | |
1242 incr_tenuring_threshold = true; | |
1243 set_increment_tenuring_threshold_for_gc_cost(true); | |
1244 } | |
1245 | |
1246 } else { | |
1247 // Survivor space overflow occurred, so promoted and survived are | |
1248 // not accurate. We'll make our best guess by combining survived | |
1249 // and promoted and count them as survivors. | |
1250 // | |
1251 // We'll lower the tenuring threshold to see if we can correct | |
1252 // things. Also, set the survivor size conservatively. We're | |
1253 // trying to avoid many overflows from occurring if defnew size | |
1254 // is just too small. | |
1255 | |
1256 decr_tenuring_threshold = true; | |
1257 } | |
1258 | |
1259 // The padded average also maintains a deviation from the average; | |
1260 // we use this to see how good of an estimate we have of what survived. | |
1261 // We're trying to pad the survivor size as little as possible without | |
1262 // overflowing the survivor spaces. | |
1263 size_t target_size = align_size_up((size_t)_avg_survived->padded_average(), | |
1264 generation_alignment()); | |
1265 target_size = MAX2(target_size, generation_alignment()); | |
1266 | |
1267 if (target_size > survivor_limit) { | |
1268 // Target size is bigger than we can handle. Let's also reduce | |
1269 // the tenuring threshold. | |
1270 target_size = survivor_limit; | |
1271 decr_tenuring_threshold = true; | |
1272 set_decrement_tenuring_threshold_for_survivor_limit(true); | |
1273 } | |
1274 | |
1275 // Finally, increment or decrement the tenuring threshold, as decided above. | |
1276 // We test for decrementing first, as we might have hit the target size | |
1277 // limit. | |
1278 if (decr_tenuring_threshold && !(AlwaysTenure || NeverTenure)) { | |
1279 if (tenuring_threshold > 1) { | |
1280 tenuring_threshold--; | |
1281 } | |
1282 } else if (incr_tenuring_threshold && !(AlwaysTenure || NeverTenure)) { | |
1283 if (tenuring_threshold < MaxTenuringThreshold) { | |
1284 tenuring_threshold++; | |
1285 } | |
1286 } | |
1287 | |
1288 // We keep a running average of the amount promoted which is used | |
1289 // to decide when we should collect the old generation (when | |
1290 // the amount of old gen free space is less than what we expect to | |
1291 // promote). | |
1292 | |
1293 if (PrintAdaptiveSizePolicy) { | |
1294 // A little more detail if Verbose is on | |
1295 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1296 if (Verbose) { | |
1297 gclog_or_tty->print( " avg_survived: %f" | |
1298 " avg_deviation: %f", | |
1299 _avg_survived->average(), | |
1300 _avg_survived->deviation()); | |
1301 } | |
1302 | |
1303 gclog_or_tty->print( " avg_survived_padded_avg: %f", | |
1304 _avg_survived->padded_average()); | |
1305 | |
1306 if (Verbose) { | |
1307 gclog_or_tty->print( " avg_promoted_avg: %f" | |
1308 " avg_promoted_dev: %f", | |
1309 gch->gc_stats(1)->avg_promoted()->average(), | |
1310 gch->gc_stats(1)->avg_promoted()->deviation()); | |
1311 } | |
1312 | |
1313 gclog_or_tty->print( " avg_promoted_padded_avg: %f" | |
1314 " avg_pretenured_padded_avg: %f" | |
1315 " tenuring_thresh: %d" | |
1316 " target_size: " SIZE_FORMAT | |
1317 " survivor_limit: " SIZE_FORMAT, | |
1318 gch->gc_stats(1)->avg_promoted()->padded_average(), | |
1319 _avg_pretenured->padded_average(), | |
1320 tenuring_threshold, target_size, survivor_limit); | |
1321 gclog_or_tty->cr(); | |
1322 } | |
1323 | |
1324 set_survivor_size(target_size); | |
1325 | |
1326 return tenuring_threshold; | |
1327 } | |
1328 | |
1329 bool CMSAdaptiveSizePolicy::get_and_clear_first_after_collection() { | |
1330 bool result = _first_after_collection; | |
1331 _first_after_collection = false; | |
1332 return result; | |
1333 } | |
1334 | |
1335 bool CMSAdaptiveSizePolicy::print_adaptive_size_policy_on( | |
1336 outputStream* st) const { | |
1337 | |
1338 if (!UseAdaptiveSizePolicy) return false; | |
1339 | |
1340 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1341 Generation* gen0 = gch->get_gen(0); | |
1342 DefNewGeneration* def_new = gen0->as_DefNewGeneration(); | |
1343 return | |
1344 AdaptiveSizePolicy::print_adaptive_size_policy_on( | |
1345 st, | |
1346 def_new->tenuring_threshold()); | |
1347 } |