Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.cpp @ 17674:85318d1fe8fe
8027146: Class loading verification failure if GC occurs in Universe::flush_dependents_on
Summary: Remove search in system dictionary and hacks, replace with verifying in CLD::_klasses list.
Reviewed-by: dcubed, acorn
author | coleenp |
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date | Sat, 15 Feb 2014 13:03:38 -0500 |
parents | a034dc5e910b |
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0 | 1 /* |
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2 * Copyright (c) 2002, 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 | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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26 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
1972 | 27 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" |
28 #include "gc_implementation/parallelScavenge/psGCAdaptivePolicyCounters.hpp" | |
29 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
30 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
31 #include "gc_interface/gcCause.hpp" | |
32 #include "memory/collectorPolicy.hpp" | |
33 #include "runtime/timer.hpp" | |
34 #include "utilities/top.hpp" | |
0 | 35 |
36 #include <math.h> | |
37 | |
38 PSAdaptiveSizePolicy::PSAdaptiveSizePolicy(size_t init_eden_size, | |
39 size_t init_promo_size, | |
40 size_t init_survivor_size, | |
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41 size_t space_alignment, |
0 | 42 double gc_pause_goal_sec, |
43 double gc_minor_pause_goal_sec, | |
44 uint gc_cost_ratio) : | |
45 AdaptiveSizePolicy(init_eden_size, | |
46 init_promo_size, | |
47 init_survivor_size, | |
48 gc_pause_goal_sec, | |
49 gc_cost_ratio), | |
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50 _collection_cost_margin_fraction(AdaptiveSizePolicyCollectionCostMargin / 100.0), |
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51 _space_alignment(space_alignment), |
0 | 52 _live_at_last_full_gc(init_promo_size), |
53 _gc_minor_pause_goal_sec(gc_minor_pause_goal_sec), | |
54 _latest_major_mutator_interval_seconds(0), | |
55 _young_gen_change_for_major_pause_count(0) | |
56 { | |
57 // Sizing policy statistics | |
58 _avg_major_pause = | |
59 new AdaptivePaddedAverage(AdaptiveTimeWeight, PausePadding); | |
60 _avg_minor_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
61 _avg_major_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
62 | |
63 _avg_base_footprint = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight); | |
64 _major_pause_old_estimator = | |
65 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
66 _major_pause_young_estimator = | |
67 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
68 _major_collection_estimator = | |
69 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
70 | |
71 _young_gen_size_increment_supplement = YoungGenerationSizeSupplement; | |
72 _old_gen_size_increment_supplement = TenuredGenerationSizeSupplement; | |
73 | |
74 // Start the timers | |
75 _major_timer.start(); | |
76 | |
77 _old_gen_policy_is_ready = false; | |
78 } | |
79 | |
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80 size_t PSAdaptiveSizePolicy::calculate_free_based_on_live(size_t live, uintx ratio_as_percentage) { |
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81 // We want to calculate how much free memory there can be based on the |
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82 // amount of live data currently in the old gen. Using the formula: |
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83 // ratio * (free + live) = free |
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84 // Some equation solving later we get: |
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85 // free = (live * ratio) / (1 - ratio) |
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86 |
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87 const double ratio = ratio_as_percentage / 100.0; |
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88 const double ratio_inverse = 1.0 - ratio; |
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89 const double tmp = live * ratio; |
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90 size_t free = (size_t)(tmp / ratio_inverse); |
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91 |
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92 return free; |
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93 } |
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94 |
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95 size_t PSAdaptiveSizePolicy::calculated_old_free_size_in_bytes() const { |
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96 size_t free_size = (size_t)(_promo_size + avg_promoted()->padded_average()); |
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97 size_t live = ParallelScavengeHeap::heap()->old_gen()->used_in_bytes(); |
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98 |
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99 if (MinHeapFreeRatio != 0) { |
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100 size_t min_free = calculate_free_based_on_live(live, MinHeapFreeRatio); |
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101 free_size = MAX2(free_size, min_free); |
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102 } |
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103 |
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104 if (MaxHeapFreeRatio != 100) { |
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105 size_t max_free = calculate_free_based_on_live(live, MaxHeapFreeRatio); |
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106 free_size = MIN2(max_free, free_size); |
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107 } |
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108 |
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109 return free_size; |
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110 } |
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111 |
0 | 112 void PSAdaptiveSizePolicy::major_collection_begin() { |
113 // Update the interval time | |
114 _major_timer.stop(); | |
115 // Save most recent collection time | |
116 _latest_major_mutator_interval_seconds = _major_timer.seconds(); | |
117 _major_timer.reset(); | |
118 _major_timer.start(); | |
119 } | |
120 | |
121 void PSAdaptiveSizePolicy::update_minor_pause_old_estimator( | |
122 double minor_pause_in_ms) { | |
123 double promo_size_in_mbytes = ((double)_promo_size)/((double)M); | |
124 _minor_pause_old_estimator->update(promo_size_in_mbytes, | |
125 minor_pause_in_ms); | |
126 } | |
127 | |
128 void PSAdaptiveSizePolicy::major_collection_end(size_t amount_live, | |
129 GCCause::Cause gc_cause) { | |
130 // Update the pause time. | |
131 _major_timer.stop(); | |
132 | |
133 if (gc_cause != GCCause::_java_lang_system_gc || | |
134 UseAdaptiveSizePolicyWithSystemGC) { | |
135 double major_pause_in_seconds = _major_timer.seconds(); | |
136 double major_pause_in_ms = major_pause_in_seconds * MILLIUNITS; | |
137 | |
138 // Sample for performance counter | |
139 _avg_major_pause->sample(major_pause_in_seconds); | |
140 | |
141 // Cost of collection (unit-less) | |
142 double collection_cost = 0.0; | |
143 if ((_latest_major_mutator_interval_seconds > 0.0) && | |
144 (major_pause_in_seconds > 0.0)) { | |
145 double interval_in_seconds = | |
146 _latest_major_mutator_interval_seconds + major_pause_in_seconds; | |
147 collection_cost = | |
148 major_pause_in_seconds / interval_in_seconds; | |
149 avg_major_gc_cost()->sample(collection_cost); | |
150 | |
151 // Sample for performance counter | |
152 _avg_major_interval->sample(interval_in_seconds); | |
153 } | |
154 | |
155 // Calculate variables used to estimate pause time vs. gen sizes | |
156 double eden_size_in_mbytes = ((double)_eden_size)/((double)M); | |
157 double promo_size_in_mbytes = ((double)_promo_size)/((double)M); | |
158 _major_pause_old_estimator->update(promo_size_in_mbytes, | |
159 major_pause_in_ms); | |
160 _major_pause_young_estimator->update(eden_size_in_mbytes, | |
161 major_pause_in_ms); | |
162 | |
163 if (PrintAdaptiveSizePolicy && Verbose) { | |
164 gclog_or_tty->print("psAdaptiveSizePolicy::major_collection_end: " | |
165 "major gc cost: %f average: %f", collection_cost, | |
166 avg_major_gc_cost()->average()); | |
167 gclog_or_tty->print_cr(" major pause: %f major period %f", | |
168 major_pause_in_ms, | |
169 _latest_major_mutator_interval_seconds * MILLIUNITS); | |
170 } | |
171 | |
172 // Calculate variable used to estimate collection cost vs. gen sizes | |
173 assert(collection_cost >= 0.0, "Expected to be non-negative"); | |
174 _major_collection_estimator->update(promo_size_in_mbytes, | |
175 collection_cost); | |
176 } | |
177 | |
178 // Update the amount live at the end of a full GC | |
179 _live_at_last_full_gc = amount_live; | |
180 | |
181 // The policy does not have enough data until at least some major collections | |
182 // have been done. | |
183 if (_avg_major_pause->count() >= AdaptiveSizePolicyReadyThreshold) { | |
184 _old_gen_policy_is_ready = true; | |
185 } | |
186 | |
187 // Interval times use this timer to measure the interval that | |
188 // the mutator runs. Reset after the GC pause has been measured. | |
189 _major_timer.reset(); | |
190 _major_timer.start(); | |
191 } | |
192 | |
193 // If the remaining free space in the old generation is less that | |
194 // that expected to be needed by the next collection, do a full | |
195 // collection now. | |
196 bool PSAdaptiveSizePolicy::should_full_GC(size_t old_free_in_bytes) { | |
197 | |
198 // A similar test is done in the scavenge's should_attempt_scavenge(). If | |
199 // this is changed, decide if that test should also be changed. | |
200 bool result = padded_average_promoted_in_bytes() > (float) old_free_in_bytes; | |
201 if (PrintGCDetails && Verbose) { | |
202 if (result) { | |
203 gclog_or_tty->print(" full after scavenge: "); | |
204 } else { | |
205 gclog_or_tty->print(" no full after scavenge: "); | |
206 } | |
207 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT | |
208 " padded_average_promoted " SIZE_FORMAT | |
209 " free in old gen " SIZE_FORMAT, | |
210 (size_t) average_promoted_in_bytes(), | |
211 (size_t) padded_average_promoted_in_bytes(), | |
212 old_free_in_bytes); | |
213 } | |
214 return result; | |
215 } | |
216 | |
217 void PSAdaptiveSizePolicy::clear_generation_free_space_flags() { | |
218 | |
219 AdaptiveSizePolicy::clear_generation_free_space_flags(); | |
220 | |
221 set_change_old_gen_for_min_pauses(0); | |
222 | |
223 set_change_young_gen_for_maj_pauses(0); | |
224 } | |
225 | |
226 // If this is not a full GC, only test and modify the young generation. | |
227 | |
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228 void PSAdaptiveSizePolicy::compute_generations_free_space( |
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229 size_t young_live, |
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230 size_t eden_live, |
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231 size_t old_live, |
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232 size_t cur_eden, |
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233 size_t max_old_gen_size, |
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234 size_t max_eden_size, |
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235 bool is_full_gc) { |
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236 compute_eden_space_size(young_live, |
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237 eden_live, |
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238 cur_eden, |
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239 max_eden_size, |
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240 is_full_gc); |
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241 |
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242 compute_old_gen_free_space(old_live, |
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243 cur_eden, |
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244 max_old_gen_size, |
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245 is_full_gc); |
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246 } |
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247 |
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248 void PSAdaptiveSizePolicy::compute_eden_space_size( |
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249 size_t young_live, |
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250 size_t eden_live, |
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251 size_t cur_eden, |
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252 size_t max_eden_size, |
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253 bool is_full_gc) { |
0 | 254 |
255 // Update statistics | |
256 // Time statistics are updated as we go, update footprint stats here | |
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257 _avg_base_footprint->sample(BaseFootPrintEstimate); |
0 | 258 avg_young_live()->sample(young_live); |
259 avg_eden_live()->sample(eden_live); | |
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260 |
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261 // This code used to return if the policy was not ready , i.e., |
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262 // policy_is_ready() returning false. The intent was that |
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263 // decisions below needed major collection times and so could |
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264 // not be made before two major collections. A consequence was |
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265 // adjustments to the young generation were not done until after |
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266 // two major collections even if the minor collections times |
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267 // exceeded the requested goals. Now let the young generation |
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268 // adjust for the minor collection times. Major collection times |
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269 // will be zero for the first collection and will naturally be |
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270 // ignored. Tenured generation adjustments are only made at the |
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271 // full collections so until the second major collection has |
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272 // been reached, no tenured generation adjustments will be made. |
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273 |
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274 // Until we know better, desired promotion size uses the last calculation |
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275 size_t desired_promo_size = _promo_size; |
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276 |
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277 // Start eden at the current value. The desired value that is stored |
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278 // in _eden_size is not bounded by constraints of the heap and can |
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279 // run away. |
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280 // |
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281 // As expected setting desired_eden_size to the current |
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282 // value of desired_eden_size as a starting point |
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283 // caused desired_eden_size to grow way too large and caused |
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284 // an overflow down stream. It may have improved performance in |
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285 // some case but is dangerous. |
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286 size_t desired_eden_size = cur_eden; |
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287 |
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288 // Cache some values. There's a bit of work getting these, so |
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289 // we might save a little time. |
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290 const double major_cost = major_gc_cost(); |
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291 const double minor_cost = minor_gc_cost(); |
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292 |
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293 // This method sets the desired eden size. That plus the |
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294 // desired survivor space sizes sets the desired young generation |
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295 // size. This methods does not know what the desired survivor |
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296 // size is but expects that other policy will attempt to make |
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297 // the survivor sizes compatible with the live data in the |
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298 // young generation. This limit is an estimate of the space left |
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299 // in the young generation after the survivor spaces have been |
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300 // subtracted out. |
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301 size_t eden_limit = max_eden_size; |
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302 |
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303 const double gc_cost_limit = GCTimeLimit/100.0; |
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304 |
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305 // Which way should we go? |
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306 // if pause requirement is not met |
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307 // adjust size of any generation with average paus exceeding |
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308 // the pause limit. Adjust one pause at a time (the larger) |
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309 // and only make adjustments for the major pause at full collections. |
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310 // else if throughput requirement not met |
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311 // adjust the size of the generation with larger gc time. Only |
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312 // adjust one generation at a time. |
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313 // else |
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314 // adjust down the total heap size. Adjust down the larger of the |
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315 // generations. |
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316 |
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317 // Add some checks for a threshold for a change. For example, |
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318 // a change less than the necessary alignment is probably not worth |
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319 // attempting. |
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320 |
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321 |
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322 if ((_avg_minor_pause->padded_average() > gc_pause_goal_sec()) || |
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323 (_avg_major_pause->padded_average() > gc_pause_goal_sec())) { |
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324 // |
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325 // Check pauses |
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326 // |
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327 // Make changes only to affect one of the pauses (the larger) |
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328 // at a time. |
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329 adjust_eden_for_pause_time(is_full_gc, &desired_promo_size, &desired_eden_size); |
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330 |
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331 } else if (_avg_minor_pause->padded_average() > gc_minor_pause_goal_sec()) { |
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332 // Adjust only for the minor pause time goal |
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333 adjust_eden_for_minor_pause_time(is_full_gc, &desired_eden_size); |
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334 |
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335 } else if(adjusted_mutator_cost() < _throughput_goal) { |
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336 // This branch used to require that (mutator_cost() > 0.0 in 1.4.2. |
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337 // This sometimes resulted in skipping to the minimize footprint |
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338 // code. Change this to try and reduce GC time if mutator time is |
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339 // negative for whatever reason. Or for future consideration, |
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340 // bail out of the code if mutator time is negative. |
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341 // |
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342 // Throughput |
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343 // |
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344 assert(major_cost >= 0.0, "major cost is < 0.0"); |
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345 assert(minor_cost >= 0.0, "minor cost is < 0.0"); |
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346 // Try to reduce the GC times. |
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347 adjust_eden_for_throughput(is_full_gc, &desired_eden_size); |
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348 |
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349 } else { |
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350 |
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351 // Be conservative about reducing the footprint. |
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352 // Do a minimum number of major collections first. |
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353 // Have reasonable averages for major and minor collections costs. |
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354 if (UseAdaptiveSizePolicyFootprintGoal && |
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355 young_gen_policy_is_ready() && |
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356 avg_major_gc_cost()->average() >= 0.0 && |
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357 avg_minor_gc_cost()->average() >= 0.0) { |
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358 size_t desired_sum = desired_eden_size + desired_promo_size; |
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359 desired_eden_size = adjust_eden_for_footprint(desired_eden_size, desired_sum); |
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360 } |
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361 } |
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362 |
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363 // Note we make the same tests as in the code block below; the code |
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364 // seems a little easier to read with the printing in another block. |
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365 if (PrintAdaptiveSizePolicy) { |
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366 if (desired_eden_size > eden_limit) { |
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367 gclog_or_tty->print_cr( |
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368 "PSAdaptiveSizePolicy::compute_eden_space_size limits:" |
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369 " desired_eden_size: " SIZE_FORMAT |
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370 " old_eden_size: " SIZE_FORMAT |
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371 " eden_limit: " SIZE_FORMAT |
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372 " cur_eden: " SIZE_FORMAT |
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373 " max_eden_size: " SIZE_FORMAT |
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374 " avg_young_live: " SIZE_FORMAT, |
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375 desired_eden_size, _eden_size, eden_limit, cur_eden, |
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376 max_eden_size, (size_t)avg_young_live()->average()); |
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377 } |
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378 if (gc_cost() > gc_cost_limit) { |
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379 gclog_or_tty->print_cr( |
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380 "PSAdaptiveSizePolicy::compute_eden_space_size: gc time limit" |
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381 " gc_cost: %f " |
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382 " GCTimeLimit: %d", |
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383 gc_cost(), GCTimeLimit); |
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384 } |
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385 } |
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386 |
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387 // Align everything and make a final limit check |
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388 desired_eden_size = align_size_up(desired_eden_size, _space_alignment); |
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389 desired_eden_size = MAX2(desired_eden_size, _space_alignment); |
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390 |
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391 eden_limit = align_size_down(eden_limit, _space_alignment); |
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392 |
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393 // And one last limit check, now that we've aligned things. |
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394 if (desired_eden_size > eden_limit) { |
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395 // If the policy says to get a larger eden but |
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396 // is hitting the limit, don't decrease eden. |
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397 // This can lead to a general drifting down of the |
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398 // eden size. Let the tenuring calculation push more |
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399 // into the old gen. |
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400 desired_eden_size = MAX2(eden_limit, cur_eden); |
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401 } |
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402 |
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403 if (PrintAdaptiveSizePolicy) { |
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404 // Timing stats |
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405 gclog_or_tty->print( |
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406 "PSAdaptiveSizePolicy::compute_eden_space_size: costs" |
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407 " minor_time: %f" |
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408 " major_cost: %f" |
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409 " mutator_cost: %f" |
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410 " throughput_goal: %f", |
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411 minor_gc_cost(), major_gc_cost(), mutator_cost(), |
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412 _throughput_goal); |
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413 |
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414 // We give more details if Verbose is set |
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415 if (Verbose) { |
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416 gclog_or_tty->print( " minor_pause: %f" |
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417 " major_pause: %f" |
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418 " minor_interval: %f" |
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419 " major_interval: %f" |
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420 " pause_goal: %f", |
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421 _avg_minor_pause->padded_average(), |
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422 _avg_major_pause->padded_average(), |
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423 _avg_minor_interval->average(), |
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424 _avg_major_interval->average(), |
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425 gc_pause_goal_sec()); |
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426 } |
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427 |
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428 // Footprint stats |
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429 gclog_or_tty->print( " live_space: " SIZE_FORMAT |
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430 " free_space: " SIZE_FORMAT, |
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431 live_space(), free_space()); |
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432 // More detail |
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433 if (Verbose) { |
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434 gclog_or_tty->print( " base_footprint: " SIZE_FORMAT |
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435 " avg_young_live: " SIZE_FORMAT |
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436 " avg_old_live: " SIZE_FORMAT, |
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437 (size_t)_avg_base_footprint->average(), |
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438 (size_t)avg_young_live()->average(), |
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439 (size_t)avg_old_live()->average()); |
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440 } |
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441 |
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442 // And finally, our old and new sizes. |
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443 gclog_or_tty->print(" old_eden_size: " SIZE_FORMAT |
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444 " desired_eden_size: " SIZE_FORMAT, |
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445 _eden_size, desired_eden_size); |
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446 gclog_or_tty->cr(); |
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447 } |
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448 |
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449 set_eden_size(desired_eden_size); |
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450 } |
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451 |
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452 void PSAdaptiveSizePolicy::compute_old_gen_free_space( |
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453 size_t old_live, |
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454 size_t cur_eden, |
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455 size_t max_old_gen_size, |
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456 bool is_full_gc) { |
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457 |
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458 // Update statistics |
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459 // Time statistics are updated as we go, update footprint stats here |
0 | 460 if (is_full_gc) { |
461 // old_live is only accurate after a full gc | |
462 avg_old_live()->sample(old_live); | |
463 } | |
464 | |
465 // This code used to return if the policy was not ready , i.e., | |
466 // policy_is_ready() returning false. The intent was that | |
467 // decisions below needed major collection times and so could | |
468 // not be made before two major collections. A consequence was | |
469 // adjustments to the young generation were not done until after | |
470 // two major collections even if the minor collections times | |
471 // exceeded the requested goals. Now let the young generation | |
472 // adjust for the minor collection times. Major collection times | |
473 // will be zero for the first collection and will naturally be | |
474 // ignored. Tenured generation adjustments are only made at the | |
475 // full collections so until the second major collection has | |
476 // been reached, no tenured generation adjustments will be made. | |
477 | |
478 // Until we know better, desired promotion size uses the last calculation | |
479 size_t desired_promo_size = _promo_size; | |
480 | |
481 // Start eden at the current value. The desired value that is stored | |
482 // in _eden_size is not bounded by constraints of the heap and can | |
483 // run away. | |
484 // | |
485 // As expected setting desired_eden_size to the current | |
486 // value of desired_eden_size as a starting point | |
487 // caused desired_eden_size to grow way too large and caused | |
488 // an overflow down stream. It may have improved performance in | |
489 // some case but is dangerous. | |
490 size_t desired_eden_size = cur_eden; | |
491 | |
492 // Cache some values. There's a bit of work getting these, so | |
493 // we might save a little time. | |
494 const double major_cost = major_gc_cost(); | |
495 const double minor_cost = minor_gc_cost(); | |
496 | |
497 // Limits on our growth | |
498 size_t promo_limit = (size_t)(max_old_gen_size - avg_old_live()->average()); | |
499 | |
500 // But don't force a promo size below the current promo size. Otherwise, | |
501 // the promo size will shrink for no good reason. | |
502 promo_limit = MAX2(promo_limit, _promo_size); | |
503 | |
504 const double gc_cost_limit = GCTimeLimit/100.0; | |
505 | |
506 // Which way should we go? | |
507 // if pause requirement is not met | |
508 // adjust size of any generation with average paus exceeding | |
509 // the pause limit. Adjust one pause at a time (the larger) | |
510 // and only make adjustments for the major pause at full collections. | |
511 // else if throughput requirement not met | |
512 // adjust the size of the generation with larger gc time. Only | |
513 // adjust one generation at a time. | |
514 // else | |
515 // adjust down the total heap size. Adjust down the larger of the | |
516 // generations. | |
517 | |
518 // Add some checks for a threshhold for a change. For example, | |
519 // a change less than the necessary alignment is probably not worth | |
520 // attempting. | |
521 | |
522 if ((_avg_minor_pause->padded_average() > gc_pause_goal_sec()) || | |
523 (_avg_major_pause->padded_average() > gc_pause_goal_sec())) { | |
524 // | |
525 // Check pauses | |
526 // | |
527 // Make changes only to affect one of the pauses (the larger) | |
528 // at a time. | |
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529 if (is_full_gc) { |
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530 set_decide_at_full_gc(decide_at_full_gc_true); |
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531 adjust_promo_for_pause_time(is_full_gc, &desired_promo_size, &desired_eden_size); |
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532 } |
0 | 533 } else if (_avg_minor_pause->padded_average() > gc_minor_pause_goal_sec()) { |
534 // Adjust only for the minor pause time goal | |
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535 adjust_promo_for_minor_pause_time(is_full_gc, &desired_promo_size, &desired_eden_size); |
0 | 536 } else if(adjusted_mutator_cost() < _throughput_goal) { |
537 // This branch used to require that (mutator_cost() > 0.0 in 1.4.2. | |
538 // This sometimes resulted in skipping to the minimize footprint | |
539 // code. Change this to try and reduce GC time if mutator time is | |
540 // negative for whatever reason. Or for future consideration, | |
541 // bail out of the code if mutator time is negative. | |
542 // | |
543 // Throughput | |
544 // | |
545 assert(major_cost >= 0.0, "major cost is < 0.0"); | |
546 assert(minor_cost >= 0.0, "minor cost is < 0.0"); | |
547 // Try to reduce the GC times. | |
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548 if (is_full_gc) { |
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549 set_decide_at_full_gc(decide_at_full_gc_true); |
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550 adjust_promo_for_throughput(is_full_gc, &desired_promo_size); |
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551 } |
0 | 552 } else { |
553 | |
554 // Be conservative about reducing the footprint. | |
555 // Do a minimum number of major collections first. | |
556 // Have reasonable averages for major and minor collections costs. | |
557 if (UseAdaptiveSizePolicyFootprintGoal && | |
558 young_gen_policy_is_ready() && | |
559 avg_major_gc_cost()->average() >= 0.0 && | |
560 avg_minor_gc_cost()->average() >= 0.0) { | |
561 if (is_full_gc) { | |
562 set_decide_at_full_gc(decide_at_full_gc_true); | |
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563 size_t desired_sum = desired_eden_size + desired_promo_size; |
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564 desired_promo_size = adjust_promo_for_footprint(desired_promo_size, desired_sum); |
0 | 565 } |
566 } | |
567 } | |
568 | |
569 // Note we make the same tests as in the code block below; the code | |
570 // seems a little easier to read with the printing in another block. | |
571 if (PrintAdaptiveSizePolicy) { | |
572 if (desired_promo_size > promo_limit) { | |
573 // "free_in_old_gen" was the original value for used for promo_limit | |
574 size_t free_in_old_gen = (size_t)(max_old_gen_size - avg_old_live()->average()); | |
575 gclog_or_tty->print_cr( | |
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576 "PSAdaptiveSizePolicy::compute_old_gen_free_space limits:" |
0 | 577 " desired_promo_size: " SIZE_FORMAT |
578 " promo_limit: " SIZE_FORMAT | |
579 " free_in_old_gen: " SIZE_FORMAT | |
580 " max_old_gen_size: " SIZE_FORMAT | |
581 " avg_old_live: " SIZE_FORMAT, | |
582 desired_promo_size, promo_limit, free_in_old_gen, | |
583 max_old_gen_size, (size_t) avg_old_live()->average()); | |
584 } | |
585 if (gc_cost() > gc_cost_limit) { | |
586 gclog_or_tty->print_cr( | |
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587 "PSAdaptiveSizePolicy::compute_old_gen_free_space: gc time limit" |
0 | 588 " gc_cost: %f " |
589 " GCTimeLimit: %d", | |
590 gc_cost(), GCTimeLimit); | |
591 } | |
592 } | |
593 | |
594 // Align everything and make a final limit check | |
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595 desired_promo_size = align_size_up(desired_promo_size, _space_alignment); |
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596 desired_promo_size = MAX2(desired_promo_size, _space_alignment); |
0 | 597 |
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598 promo_limit = align_size_down(promo_limit, _space_alignment); |
0 | 599 |
600 // And one last limit check, now that we've aligned things. | |
601 desired_promo_size = MIN2(desired_promo_size, promo_limit); | |
602 | |
603 if (PrintAdaptiveSizePolicy) { | |
604 // Timing stats | |
605 gclog_or_tty->print( | |
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606 "PSAdaptiveSizePolicy::compute_old_gen_free_space: costs" |
0 | 607 " minor_time: %f" |
608 " major_cost: %f" | |
609 " mutator_cost: %f" | |
610 " throughput_goal: %f", | |
611 minor_gc_cost(), major_gc_cost(), mutator_cost(), | |
612 _throughput_goal); | |
613 | |
614 // We give more details if Verbose is set | |
615 if (Verbose) { | |
616 gclog_or_tty->print( " minor_pause: %f" | |
617 " major_pause: %f" | |
618 " minor_interval: %f" | |
619 " major_interval: %f" | |
620 " pause_goal: %f", | |
621 _avg_minor_pause->padded_average(), | |
622 _avg_major_pause->padded_average(), | |
623 _avg_minor_interval->average(), | |
624 _avg_major_interval->average(), | |
625 gc_pause_goal_sec()); | |
626 } | |
627 | |
628 // Footprint stats | |
629 gclog_or_tty->print( " live_space: " SIZE_FORMAT | |
630 " free_space: " SIZE_FORMAT, | |
631 live_space(), free_space()); | |
632 // More detail | |
633 if (Verbose) { | |
634 gclog_or_tty->print( " base_footprint: " SIZE_FORMAT | |
635 " avg_young_live: " SIZE_FORMAT | |
636 " avg_old_live: " SIZE_FORMAT, | |
637 (size_t)_avg_base_footprint->average(), | |
638 (size_t)avg_young_live()->average(), | |
639 (size_t)avg_old_live()->average()); | |
640 } | |
641 | |
642 // And finally, our old and new sizes. | |
643 gclog_or_tty->print(" old_promo_size: " SIZE_FORMAT | |
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644 " desired_promo_size: " SIZE_FORMAT, |
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645 _promo_size, desired_promo_size); |
0 | 646 gclog_or_tty->cr(); |
647 } | |
648 | |
649 set_promo_size(desired_promo_size); | |
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650 } |
0 | 651 |
652 void PSAdaptiveSizePolicy::decay_supplemental_growth(bool is_full_gc) { | |
653 // Decay the supplemental increment? Decay the supplement growth | |
654 // factor even if it is not used. It is only meant to give a boost | |
655 // to the initial growth and if it is not used, then it was not | |
656 // needed. | |
657 if (is_full_gc) { | |
658 // Don't wait for the threshold value for the major collections. If | |
659 // here, the supplemental growth term was used and should decay. | |
660 if ((_avg_major_pause->count() % TenuredGenerationSizeSupplementDecay) | |
661 == 0) { | |
662 _old_gen_size_increment_supplement = | |
663 _old_gen_size_increment_supplement >> 1; | |
664 } | |
665 } else { | |
666 if ((_avg_minor_pause->count() >= AdaptiveSizePolicyReadyThreshold) && | |
667 (_avg_minor_pause->count() % YoungGenerationSizeSupplementDecay) == 0) { | |
668 _young_gen_size_increment_supplement = | |
669 _young_gen_size_increment_supplement >> 1; | |
670 } | |
671 } | |
672 } | |
673 | |
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674 void PSAdaptiveSizePolicy::adjust_promo_for_minor_pause_time(bool is_full_gc, |
0 | 675 size_t* desired_promo_size_ptr, size_t* desired_eden_size_ptr) { |
676 | |
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677 if (PSAdjustTenuredGenForMinorPause) { |
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678 if (is_full_gc) { |
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679 set_decide_at_full_gc(decide_at_full_gc_true); |
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680 } |
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681 // If the desired eden size is as small as it will get, |
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682 // try to adjust the old gen size. |
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683 if (*desired_eden_size_ptr <= _space_alignment) { |
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684 // Vary the old gen size to reduce the young gen pause. This |
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685 // may not be a good idea. This is just a test. |
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686 if (minor_pause_old_estimator()->decrement_will_decrease()) { |
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687 set_change_old_gen_for_min_pauses(decrease_old_gen_for_min_pauses_true); |
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688 *desired_promo_size_ptr = |
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689 _promo_size - promo_decrement_aligned_down(*desired_promo_size_ptr); |
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690 } else { |
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691 set_change_old_gen_for_min_pauses(increase_old_gen_for_min_pauses_true); |
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692 size_t promo_heap_delta = |
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693 promo_increment_with_supplement_aligned_up(*desired_promo_size_ptr); |
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694 if ((*desired_promo_size_ptr + promo_heap_delta) > |
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695 *desired_promo_size_ptr) { |
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696 *desired_promo_size_ptr = |
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697 _promo_size + promo_heap_delta; |
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698 } |
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699 } |
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700 } |
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701 } |
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702 } |
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703 |
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704 void PSAdaptiveSizePolicy::adjust_eden_for_minor_pause_time(bool is_full_gc, |
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705 size_t* desired_eden_size_ptr) { |
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706 |
0 | 707 // Adjust the young generation size to reduce pause time of |
708 // of collections. | |
709 // | |
710 // The AdaptiveSizePolicyInitializingSteps test is not used | |
711 // here. It has not seemed to be needed but perhaps should | |
712 // be added for consistency. | |
713 if (minor_pause_young_estimator()->decrement_will_decrease()) { | |
714 // reduce eden size | |
715 set_change_young_gen_for_min_pauses( | |
716 decrease_young_gen_for_min_pauses_true); | |
717 *desired_eden_size_ptr = *desired_eden_size_ptr - | |
718 eden_decrement_aligned_down(*desired_eden_size_ptr); | |
719 } else { | |
720 // EXPERIMENTAL ADJUSTMENT | |
721 // Only record that the estimator indicated such an action. | |
722 // *desired_eden_size_ptr = *desired_eden_size_ptr + eden_heap_delta; | |
723 set_change_young_gen_for_min_pauses( | |
724 increase_young_gen_for_min_pauses_true); | |
725 } | |
726 } | |
727 | |
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728 void PSAdaptiveSizePolicy::adjust_promo_for_pause_time(bool is_full_gc, |
0 | 729 size_t* desired_promo_size_ptr, |
730 size_t* desired_eden_size_ptr) { | |
731 | |
732 size_t promo_heap_delta = 0; | |
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733 // Add some checks for a threshold for a change. For example, |
0 | 734 // a change less than the required alignment is probably not worth |
735 // attempting. | |
736 | |
737 if (_avg_minor_pause->padded_average() > _avg_major_pause->padded_average()) { | |
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738 adjust_promo_for_minor_pause_time(is_full_gc, desired_promo_size_ptr, desired_eden_size_ptr); |
0 | 739 // major pause adjustments |
740 } else if (is_full_gc) { | |
741 // Adjust for the major pause time only at full gc's because the | |
742 // affects of a change can only be seen at full gc's. | |
743 | |
744 // Reduce old generation size to reduce pause? | |
745 if (major_pause_old_estimator()->decrement_will_decrease()) { | |
746 // reduce old generation size | |
747 set_change_old_gen_for_maj_pauses(decrease_old_gen_for_maj_pauses_true); | |
748 promo_heap_delta = promo_decrement_aligned_down(*desired_promo_size_ptr); | |
749 *desired_promo_size_ptr = _promo_size - promo_heap_delta; | |
750 } else { | |
751 // EXPERIMENTAL ADJUSTMENT | |
752 // Only record that the estimator indicated such an action. | |
753 // *desired_promo_size_ptr = _promo_size + | |
754 // promo_increment_aligned_up(*desired_promo_size_ptr); | |
755 set_change_old_gen_for_maj_pauses(increase_old_gen_for_maj_pauses_true); | |
756 } | |
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757 } |
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758 |
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759 if (PrintAdaptiveSizePolicy && Verbose) { |
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760 gclog_or_tty->print_cr( |
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761 "PSAdaptiveSizePolicy::adjust_promo_for_pause_time " |
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762 "adjusting gen sizes for major pause (avg %f goal %f). " |
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763 "desired_promo_size " SIZE_FORMAT " promo delta " SIZE_FORMAT, |
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764 _avg_major_pause->average(), gc_pause_goal_sec(), |
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765 *desired_promo_size_ptr, promo_heap_delta); |
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766 } |
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767 } |
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768 |
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769 void PSAdaptiveSizePolicy::adjust_eden_for_pause_time(bool is_full_gc, |
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770 size_t* desired_promo_size_ptr, |
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771 size_t* desired_eden_size_ptr) { |
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772 |
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773 size_t eden_heap_delta = 0; |
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774 // Add some checks for a threshold for a change. For example, |
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775 // a change less than the required alignment is probably not worth |
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776 // attempting. |
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777 if (_avg_minor_pause->padded_average() > _avg_major_pause->padded_average()) { |
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778 adjust_eden_for_minor_pause_time(is_full_gc, |
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779 desired_eden_size_ptr); |
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780 // major pause adjustments |
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781 } else if (is_full_gc) { |
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782 // Adjust for the major pause time only at full gc's because the |
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783 // affects of a change can only be seen at full gc's. |
0 | 784 if (PSAdjustYoungGenForMajorPause) { |
785 // If the promo size is at the minimum (i.e., the old gen | |
786 // size will not actually decrease), consider changing the | |
787 // young gen size. | |
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788 if (*desired_promo_size_ptr < _space_alignment) { |
0 | 789 // If increasing the young generation will decrease the old gen |
790 // pause, do it. | |
791 // During startup there is noise in the statistics for deciding | |
792 // on whether to increase or decrease the young gen size. For | |
793 // some number of iterations, just try to increase the young | |
794 // gen size if the major pause is too long to try and establish | |
795 // good statistics for later decisions. | |
796 if (major_pause_young_estimator()->increment_will_decrease() || | |
797 (_young_gen_change_for_major_pause_count | |
798 <= AdaptiveSizePolicyInitializingSteps)) { | |
799 set_change_young_gen_for_maj_pauses( | |
800 increase_young_gen_for_maj_pauses_true); | |
801 eden_heap_delta = eden_increment_aligned_up(*desired_eden_size_ptr); | |
802 *desired_eden_size_ptr = _eden_size + eden_heap_delta; | |
803 _young_gen_change_for_major_pause_count++; | |
804 } else { | |
805 // Record that decreasing the young gen size would decrease | |
806 // the major pause | |
807 set_change_young_gen_for_maj_pauses( | |
808 decrease_young_gen_for_maj_pauses_true); | |
809 eden_heap_delta = eden_decrement_aligned_down(*desired_eden_size_ptr); | |
810 *desired_eden_size_ptr = _eden_size - eden_heap_delta; | |
811 } | |
812 } | |
813 } | |
814 } | |
815 | |
816 if (PrintAdaptiveSizePolicy && Verbose) { | |
817 gclog_or_tty->print_cr( | |
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818 "PSAdaptiveSizePolicy::adjust_eden_for_pause_time " |
0 | 819 "adjusting gen sizes for major pause (avg %f goal %f). " |
10288
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820 "desired_eden_size " SIZE_FORMAT " eden delta " SIZE_FORMAT, |
0 | 821 _avg_major_pause->average(), gc_pause_goal_sec(), |
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822 *desired_eden_size_ptr, eden_heap_delta); |
0 | 823 } |
824 } | |
825 | |
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826 void PSAdaptiveSizePolicy::adjust_promo_for_throughput(bool is_full_gc, |
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827 size_t* desired_promo_size_ptr) { |
0 | 828 |
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829 // Add some checks for a threshold for a change. For example, |
0 | 830 // a change less than the required alignment is probably not worth |
831 // attempting. | |
832 | |
833 if ((gc_cost() + mutator_cost()) == 0.0) { | |
834 return; | |
835 } | |
836 | |
837 if (PrintAdaptiveSizePolicy && Verbose) { | |
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838 gclog_or_tty->print("\nPSAdaptiveSizePolicy::adjust_promo_for_throughput(" |
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839 "is_full: %d, promo: " SIZE_FORMAT "): ", |
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840 is_full_gc, *desired_promo_size_ptr); |
0 | 841 gclog_or_tty->print_cr("mutator_cost %f major_gc_cost %f " |
842 "minor_gc_cost %f", mutator_cost(), major_gc_cost(), minor_gc_cost()); | |
843 } | |
844 | |
845 // Tenured generation | |
846 if (is_full_gc) { | |
847 // Calculate the change to use for the tenured gen. | |
848 size_t scaled_promo_heap_delta = 0; | |
849 // Can the increment to the generation be scaled? | |
850 if (gc_cost() >= 0.0 && major_gc_cost() >= 0.0) { | |
851 size_t promo_heap_delta = | |
852 promo_increment_with_supplement_aligned_up(*desired_promo_size_ptr); | |
853 double scale_by_ratio = major_gc_cost() / gc_cost(); | |
854 scaled_promo_heap_delta = | |
855 (size_t) (scale_by_ratio * (double) promo_heap_delta); | |
856 if (PrintAdaptiveSizePolicy && Verbose) { | |
857 gclog_or_tty->print_cr( | |
858 "Scaled tenured increment: " SIZE_FORMAT " by %f down to " | |
859 SIZE_FORMAT, | |
860 promo_heap_delta, scale_by_ratio, scaled_promo_heap_delta); | |
861 } | |
862 } else if (major_gc_cost() >= 0.0) { | |
863 // Scaling is not going to work. If the major gc time is the | |
864 // larger, give it a full increment. | |
865 if (major_gc_cost() >= minor_gc_cost()) { | |
866 scaled_promo_heap_delta = | |
867 promo_increment_with_supplement_aligned_up(*desired_promo_size_ptr); | |
868 } | |
869 } else { | |
870 // Don't expect to get here but it's ok if it does | |
871 // in the product build since the delta will be 0 | |
872 // and nothing will change. | |
873 assert(false, "Unexpected value for gc costs"); | |
874 } | |
875 | |
876 switch (AdaptiveSizeThroughPutPolicy) { | |
877 case 1: | |
878 // Early in the run the statistics might not be good. Until | |
879 // a specific number of collections have been, use the heuristic | |
880 // that a larger generation size means lower collection costs. | |
881 if (major_collection_estimator()->increment_will_decrease() || | |
882 (_old_gen_change_for_major_throughput | |
883 <= AdaptiveSizePolicyInitializingSteps)) { | |
884 // Increase tenured generation size to reduce major collection cost | |
885 if ((*desired_promo_size_ptr + scaled_promo_heap_delta) > | |
886 *desired_promo_size_ptr) { | |
887 *desired_promo_size_ptr = _promo_size + scaled_promo_heap_delta; | |
888 } | |
889 set_change_old_gen_for_throughput( | |
890 increase_old_gen_for_throughput_true); | |
891 _old_gen_change_for_major_throughput++; | |
892 } else { | |
893 // EXPERIMENTAL ADJUSTMENT | |
894 // Record that decreasing the old gen size would decrease | |
895 // the major collection cost but don't do it. | |
896 // *desired_promo_size_ptr = _promo_size - | |
897 // promo_decrement_aligned_down(*desired_promo_size_ptr); | |
898 set_change_old_gen_for_throughput( | |
899 decrease_old_gen_for_throughput_true); | |
900 } | |
901 | |
902 break; | |
903 default: | |
904 // Simplest strategy | |
905 if ((*desired_promo_size_ptr + scaled_promo_heap_delta) > | |
906 *desired_promo_size_ptr) { | |
907 *desired_promo_size_ptr = *desired_promo_size_ptr + | |
908 scaled_promo_heap_delta; | |
909 } | |
910 set_change_old_gen_for_throughput( | |
911 increase_old_gen_for_throughput_true); | |
912 _old_gen_change_for_major_throughput++; | |
913 } | |
914 | |
915 if (PrintAdaptiveSizePolicy && Verbose) { | |
916 gclog_or_tty->print_cr( | |
917 "adjusting tenured gen for throughput (avg %f goal %f). " | |
918 "desired_promo_size " SIZE_FORMAT " promo_delta " SIZE_FORMAT , | |
919 mutator_cost(), _throughput_goal, | |
920 *desired_promo_size_ptr, scaled_promo_heap_delta); | |
921 } | |
922 } | |
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923 } |
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924 |
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925 void PSAdaptiveSizePolicy::adjust_eden_for_throughput(bool is_full_gc, |
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926 size_t* desired_eden_size_ptr) { |
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927 |
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928 // Add some checks for a threshold for a change. For example, |
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929 // a change less than the required alignment is probably not worth |
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930 // attempting. |
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931 |
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932 if ((gc_cost() + mutator_cost()) == 0.0) { |
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933 return; |
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934 } |
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935 |
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936 if (PrintAdaptiveSizePolicy && Verbose) { |
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937 gclog_or_tty->print("\nPSAdaptiveSizePolicy::adjust_eden_for_throughput(" |
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938 "is_full: %d, cur_eden: " SIZE_FORMAT "): ", |
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939 is_full_gc, *desired_eden_size_ptr); |
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940 gclog_or_tty->print_cr("mutator_cost %f major_gc_cost %f " |
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941 "minor_gc_cost %f", mutator_cost(), major_gc_cost(), minor_gc_cost()); |
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942 } |
0 | 943 |
944 // Young generation | |
945 size_t scaled_eden_heap_delta = 0; | |
946 // Can the increment to the generation be scaled? | |
947 if (gc_cost() >= 0.0 && minor_gc_cost() >= 0.0) { | |
948 size_t eden_heap_delta = | |
949 eden_increment_with_supplement_aligned_up(*desired_eden_size_ptr); | |
950 double scale_by_ratio = minor_gc_cost() / gc_cost(); | |
951 assert(scale_by_ratio <= 1.0 && scale_by_ratio >= 0.0, "Scaling is wrong"); | |
952 scaled_eden_heap_delta = | |
953 (size_t) (scale_by_ratio * (double) eden_heap_delta); | |
954 if (PrintAdaptiveSizePolicy && Verbose) { | |
955 gclog_or_tty->print_cr( | |
956 "Scaled eden increment: " SIZE_FORMAT " by %f down to " | |
957 SIZE_FORMAT, | |
958 eden_heap_delta, scale_by_ratio, scaled_eden_heap_delta); | |
959 } | |
960 } else if (minor_gc_cost() >= 0.0) { | |
961 // Scaling is not going to work. If the minor gc time is the | |
962 // larger, give it a full increment. | |
963 if (minor_gc_cost() > major_gc_cost()) { | |
964 scaled_eden_heap_delta = | |
965 eden_increment_with_supplement_aligned_up(*desired_eden_size_ptr); | |
966 } | |
967 } else { | |
968 // Don't expect to get here but it's ok if it does | |
969 // in the product build since the delta will be 0 | |
970 // and nothing will change. | |
971 assert(false, "Unexpected value for gc costs"); | |
972 } | |
973 | |
974 // Use a heuristic for some number of collections to give | |
975 // the averages time to settle down. | |
976 switch (AdaptiveSizeThroughPutPolicy) { | |
977 case 1: | |
978 if (minor_collection_estimator()->increment_will_decrease() || | |
979 (_young_gen_change_for_minor_throughput | |
980 <= AdaptiveSizePolicyInitializingSteps)) { | |
981 // Expand young generation size to reduce frequency of | |
982 // of collections. | |
983 if ((*desired_eden_size_ptr + scaled_eden_heap_delta) > | |
984 *desired_eden_size_ptr) { | |
985 *desired_eden_size_ptr = | |
986 *desired_eden_size_ptr + scaled_eden_heap_delta; | |
987 } | |
988 set_change_young_gen_for_throughput( | |
989 increase_young_gen_for_througput_true); | |
990 _young_gen_change_for_minor_throughput++; | |
991 } else { | |
992 // EXPERIMENTAL ADJUSTMENT | |
993 // Record that decreasing the young gen size would decrease | |
994 // the minor collection cost but don't do it. | |
995 // *desired_eden_size_ptr = _eden_size - | |
996 // eden_decrement_aligned_down(*desired_eden_size_ptr); | |
997 set_change_young_gen_for_throughput( | |
998 decrease_young_gen_for_througput_true); | |
999 } | |
1000 break; | |
1001 default: | |
1002 if ((*desired_eden_size_ptr + scaled_eden_heap_delta) > | |
1003 *desired_eden_size_ptr) { | |
1004 *desired_eden_size_ptr = | |
1005 *desired_eden_size_ptr + scaled_eden_heap_delta; | |
1006 } | |
1007 set_change_young_gen_for_throughput( | |
1008 increase_young_gen_for_througput_true); | |
1009 _young_gen_change_for_minor_throughput++; | |
1010 } | |
1011 | |
1012 if (PrintAdaptiveSizePolicy && Verbose) { | |
1013 gclog_or_tty->print_cr( | |
1014 "adjusting eden for throughput (avg %f goal %f). desired_eden_size " | |
1015 SIZE_FORMAT " eden delta " SIZE_FORMAT "\n", | |
1016 mutator_cost(), _throughput_goal, | |
1017 *desired_eden_size_ptr, scaled_eden_heap_delta); | |
1018 } | |
1019 } | |
1020 | |
1021 size_t PSAdaptiveSizePolicy::adjust_promo_for_footprint( | |
1022 size_t desired_promo_size, size_t desired_sum) { | |
1023 assert(desired_promo_size <= desired_sum, "Inconsistent parameters"); | |
1024 set_decrease_for_footprint(decrease_old_gen_for_footprint_true); | |
1025 | |
1026 size_t change = promo_decrement(desired_promo_size); | |
1027 change = scale_down(change, desired_promo_size, desired_sum); | |
1028 | |
1029 size_t reduced_size = desired_promo_size - change; | |
1030 | |
1031 if (PrintAdaptiveSizePolicy && Verbose) { | |
1032 gclog_or_tty->print_cr( | |
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1033 "AdaptiveSizePolicy::adjust_promo_for_footprint " |
0 | 1034 "adjusting tenured gen for footprint. " |
1035 "starting promo size " SIZE_FORMAT | |
1036 " reduced promo size " SIZE_FORMAT, | |
1037 " promo delta " SIZE_FORMAT, | |
1038 desired_promo_size, reduced_size, change ); | |
1039 } | |
1040 | |
1041 assert(reduced_size <= desired_promo_size, "Inconsistent result"); | |
1042 return reduced_size; | |
1043 } | |
1044 | |
1045 size_t PSAdaptiveSizePolicy::adjust_eden_for_footprint( | |
1046 size_t desired_eden_size, size_t desired_sum) { | |
1047 assert(desired_eden_size <= desired_sum, "Inconsistent parameters"); | |
1048 set_decrease_for_footprint(decrease_young_gen_for_footprint_true); | |
1049 | |
1050 size_t change = eden_decrement(desired_eden_size); | |
1051 change = scale_down(change, desired_eden_size, desired_sum); | |
1052 | |
1053 size_t reduced_size = desired_eden_size - change; | |
1054 | |
1055 if (PrintAdaptiveSizePolicy && Verbose) { | |
1056 gclog_or_tty->print_cr( | |
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1057 "AdaptiveSizePolicy::adjust_eden_for_footprint " |
0 | 1058 "adjusting eden for footprint. " |
1059 " starting eden size " SIZE_FORMAT | |
1060 " reduced eden size " SIZE_FORMAT | |
1061 " eden delta " SIZE_FORMAT, | |
1062 desired_eden_size, reduced_size, change); | |
1063 } | |
1064 | |
1065 assert(reduced_size <= desired_eden_size, "Inconsistent result"); | |
1066 return reduced_size; | |
1067 } | |
1068 | |
1069 // Scale down "change" by the factor | |
1070 // part / total | |
1071 // Don't align the results. | |
1072 | |
1073 size_t PSAdaptiveSizePolicy::scale_down(size_t change, | |
1074 double part, | |
1075 double total) { | |
1076 assert(part <= total, "Inconsistent input"); | |
1077 size_t reduced_change = change; | |
1078 if (total > 0) { | |
1079 double fraction = part / total; | |
1080 reduced_change = (size_t) (fraction * (double) change); | |
1081 } | |
1082 assert(reduced_change <= change, "Inconsistent result"); | |
1083 return reduced_change; | |
1084 } | |
1085 | |
1086 size_t PSAdaptiveSizePolicy::eden_increment(size_t cur_eden, | |
1087 uint percent_change) { | |
1088 size_t eden_heap_delta; | |
1089 eden_heap_delta = cur_eden / 100 * percent_change; | |
1090 return eden_heap_delta; | |
1091 } | |
1092 | |
1093 size_t PSAdaptiveSizePolicy::eden_increment(size_t cur_eden) { | |
1094 return eden_increment(cur_eden, YoungGenerationSizeIncrement); | |
1095 } | |
1096 | |
1097 size_t PSAdaptiveSizePolicy::eden_increment_aligned_up(size_t cur_eden) { | |
1098 size_t result = eden_increment(cur_eden, YoungGenerationSizeIncrement); | |
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1099 return align_size_up(result, _space_alignment); |
0 | 1100 } |
1101 | |
1102 size_t PSAdaptiveSizePolicy::eden_increment_aligned_down(size_t cur_eden) { | |
1103 size_t result = eden_increment(cur_eden); | |
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1104 return align_size_down(result, _space_alignment); |
0 | 1105 } |
1106 | |
1107 size_t PSAdaptiveSizePolicy::eden_increment_with_supplement_aligned_up( | |
1108 size_t cur_eden) { | |
1109 size_t result = eden_increment(cur_eden, | |
1110 YoungGenerationSizeIncrement + _young_gen_size_increment_supplement); | |
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1111 return align_size_up(result, _space_alignment); |
0 | 1112 } |
1113 | |
1114 size_t PSAdaptiveSizePolicy::eden_decrement_aligned_down(size_t cur_eden) { | |
1115 size_t eden_heap_delta = eden_decrement(cur_eden); | |
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1116 return align_size_down(eden_heap_delta, _space_alignment); |
0 | 1117 } |
1118 | |
1119 size_t PSAdaptiveSizePolicy::eden_decrement(size_t cur_eden) { | |
1120 size_t eden_heap_delta = eden_increment(cur_eden) / | |
1121 AdaptiveSizeDecrementScaleFactor; | |
1122 return eden_heap_delta; | |
1123 } | |
1124 | |
1125 size_t PSAdaptiveSizePolicy::promo_increment(size_t cur_promo, | |
1126 uint percent_change) { | |
1127 size_t promo_heap_delta; | |
1128 promo_heap_delta = cur_promo / 100 * percent_change; | |
1129 return promo_heap_delta; | |
1130 } | |
1131 | |
1132 size_t PSAdaptiveSizePolicy::promo_increment(size_t cur_promo) { | |
1133 return promo_increment(cur_promo, TenuredGenerationSizeIncrement); | |
1134 } | |
1135 | |
1136 size_t PSAdaptiveSizePolicy::promo_increment_aligned_up(size_t cur_promo) { | |
1137 size_t result = promo_increment(cur_promo, TenuredGenerationSizeIncrement); | |
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1138 return align_size_up(result, _space_alignment); |
0 | 1139 } |
1140 | |
1141 size_t PSAdaptiveSizePolicy::promo_increment_aligned_down(size_t cur_promo) { | |
1142 size_t result = promo_increment(cur_promo, TenuredGenerationSizeIncrement); | |
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1143 return align_size_down(result, _space_alignment); |
0 | 1144 } |
1145 | |
1146 size_t PSAdaptiveSizePolicy::promo_increment_with_supplement_aligned_up( | |
1147 size_t cur_promo) { | |
1148 size_t result = promo_increment(cur_promo, | |
1149 TenuredGenerationSizeIncrement + _old_gen_size_increment_supplement); | |
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1150 return align_size_up(result, _space_alignment); |
0 | 1151 } |
1152 | |
1153 size_t PSAdaptiveSizePolicy::promo_decrement_aligned_down(size_t cur_promo) { | |
1154 size_t promo_heap_delta = promo_decrement(cur_promo); | |
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1155 return align_size_down(promo_heap_delta, _space_alignment); |
0 | 1156 } |
1157 | |
1158 size_t PSAdaptiveSizePolicy::promo_decrement(size_t cur_promo) { | |
1159 size_t promo_heap_delta = promo_increment(cur_promo); | |
1160 promo_heap_delta = promo_heap_delta / AdaptiveSizeDecrementScaleFactor; | |
1161 return promo_heap_delta; | |
1162 } | |
1163 | |
6818 | 1164 uint PSAdaptiveSizePolicy::compute_survivor_space_size_and_threshold( |
0 | 1165 bool is_survivor_overflow, |
6818 | 1166 uint tenuring_threshold, |
0 | 1167 size_t survivor_limit) { |
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1168 assert(survivor_limit >= _space_alignment, |
0 | 1169 "survivor_limit too small"); |
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1170 assert((size_t)align_size_down(survivor_limit, _space_alignment) |
0 | 1171 == survivor_limit, "survivor_limit not aligned"); |
1172 | |
1173 // This method is called even if the tenuring threshold and survivor | |
1174 // spaces are not adjusted so that the averages are sampled above. | |
1175 if (!UsePSAdaptiveSurvivorSizePolicy || | |
1176 !young_gen_policy_is_ready()) { | |
1177 return tenuring_threshold; | |
1178 } | |
1179 | |
1180 // We'll decide whether to increase or decrease the tenuring | |
1181 // threshold based partly on the newly computed survivor size | |
1182 // (if we hit the maximum limit allowed, we'll always choose to | |
1183 // decrement the threshold). | |
1184 bool incr_tenuring_threshold = false; | |
1185 bool decr_tenuring_threshold = false; | |
1186 | |
1187 set_decrement_tenuring_threshold_for_gc_cost(false); | |
1188 set_increment_tenuring_threshold_for_gc_cost(false); | |
1189 set_decrement_tenuring_threshold_for_survivor_limit(false); | |
1190 | |
1191 if (!is_survivor_overflow) { | |
1192 // Keep running averages on how much survived | |
1193 | |
1194 // We use the tenuring threshold to equalize the cost of major | |
1195 // and minor collections. | |
1196 // ThresholdTolerance is used to indicate how sensitive the | |
1197 // tenuring threshold is to differences in cost betweent the | |
1198 // collection types. | |
1199 | |
1200 // Get the times of interest. This involves a little work, so | |
1201 // we cache the values here. | |
1202 const double major_cost = major_gc_cost(); | |
1203 const double minor_cost = minor_gc_cost(); | |
1204 | |
1205 if (minor_cost > major_cost * _threshold_tolerance_percent) { | |
1206 // Minor times are getting too long; lower the threshold so | |
1207 // less survives and more is promoted. | |
1208 decr_tenuring_threshold = true; | |
1209 set_decrement_tenuring_threshold_for_gc_cost(true); | |
1210 } else if (major_cost > minor_cost * _threshold_tolerance_percent) { | |
1211 // Major times are too long, so we want less promotion. | |
1212 incr_tenuring_threshold = true; | |
1213 set_increment_tenuring_threshold_for_gc_cost(true); | |
1214 } | |
1215 | |
1216 } else { | |
1217 // Survivor space overflow occurred, so promoted and survived are | |
1218 // not accurate. We'll make our best guess by combining survived | |
1219 // and promoted and count them as survivors. | |
1220 // | |
1221 // We'll lower the tenuring threshold to see if we can correct | |
1222 // things. Also, set the survivor size conservatively. We're | |
1223 // trying to avoid many overflows from occurring if defnew size | |
1224 // is just too small. | |
1225 | |
1226 decr_tenuring_threshold = true; | |
1227 } | |
1228 | |
1229 // The padded average also maintains a deviation from the average; | |
1230 // we use this to see how good of an estimate we have of what survived. | |
1231 // We're trying to pad the survivor size as little as possible without | |
1232 // overflowing the survivor spaces. | |
1233 size_t target_size = align_size_up((size_t)_avg_survived->padded_average(), | |
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1234 _space_alignment); |
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1235 target_size = MAX2(target_size, _space_alignment); |
0 | 1236 |
1237 if (target_size > survivor_limit) { | |
1238 // Target size is bigger than we can handle. Let's also reduce | |
1239 // the tenuring threshold. | |
1240 target_size = survivor_limit; | |
1241 decr_tenuring_threshold = true; | |
1242 set_decrement_tenuring_threshold_for_survivor_limit(true); | |
1243 } | |
1244 | |
1245 // Finally, increment or decrement the tenuring threshold, as decided above. | |
1246 // We test for decrementing first, as we might have hit the target size | |
1247 // limit. | |
1248 if (decr_tenuring_threshold && !(AlwaysTenure || NeverTenure)) { | |
1249 if (tenuring_threshold > 1) { | |
1250 tenuring_threshold--; | |
1251 } | |
1252 } else if (incr_tenuring_threshold && !(AlwaysTenure || NeverTenure)) { | |
1253 if (tenuring_threshold < MaxTenuringThreshold) { | |
1254 tenuring_threshold++; | |
1255 } | |
1256 } | |
1257 | |
1258 // We keep a running average of the amount promoted which is used | |
1259 // to decide when we should collect the old generation (when | |
1260 // the amount of old gen free space is less than what we expect to | |
1261 // promote). | |
1262 | |
1263 if (PrintAdaptiveSizePolicy) { | |
1264 // A little more detail if Verbose is on | |
1265 if (Verbose) { | |
1266 gclog_or_tty->print( " avg_survived: %f" | |
1267 " avg_deviation: %f", | |
1268 _avg_survived->average(), | |
1269 _avg_survived->deviation()); | |
1270 } | |
1271 | |
1272 gclog_or_tty->print( " avg_survived_padded_avg: %f", | |
1273 _avg_survived->padded_average()); | |
1274 | |
1275 if (Verbose) { | |
1276 gclog_or_tty->print( " avg_promoted_avg: %f" | |
1277 " avg_promoted_dev: %f", | |
1278 avg_promoted()->average(), | |
1279 avg_promoted()->deviation()); | |
1280 } | |
1281 | |
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1282 gclog_or_tty->print_cr( " avg_promoted_padded_avg: %f" |
0 | 1283 " avg_pretenured_padded_avg: %f" |
1284 " tenuring_thresh: %d" | |
1285 " target_size: " SIZE_FORMAT, | |
1286 avg_promoted()->padded_average(), | |
1287 _avg_pretenured->padded_average(), | |
1288 tenuring_threshold, target_size); | |
1289 } | |
1290 | |
1291 set_survivor_size(target_size); | |
1292 | |
1293 return tenuring_threshold; | |
1294 } | |
1295 | |
1296 void PSAdaptiveSizePolicy::update_averages(bool is_survivor_overflow, | |
1297 size_t survived, | |
1298 size_t promoted) { | |
1299 // Update averages | |
1300 if (!is_survivor_overflow) { | |
1301 // Keep running averages on how much survived | |
1302 _avg_survived->sample(survived); | |
1303 } else { | |
1304 size_t survived_guess = survived + promoted; | |
1305 _avg_survived->sample(survived_guess); | |
1306 } | |
1307 avg_promoted()->sample(promoted + _avg_pretenured->padded_average()); | |
1308 | |
1309 if (PrintAdaptiveSizePolicy) { | |
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1310 gclog_or_tty->print_cr( |
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1311 "AdaptiveSizePolicy::update_averages:" |
0 | 1312 " survived: " SIZE_FORMAT |
1313 " promoted: " SIZE_FORMAT | |
1314 " overflow: %s", | |
1315 survived, promoted, is_survivor_overflow ? "true" : "false"); | |
1316 } | |
1317 } | |
1318 | |
1319 bool PSAdaptiveSizePolicy::print_adaptive_size_policy_on(outputStream* st) | |
1320 const { | |
1321 | |
1322 if (!UseAdaptiveSizePolicy) return false; | |
1323 | |
1324 return AdaptiveSizePolicy::print_adaptive_size_policy_on( | |
1325 st, | |
1326 PSScavenge::tenuring_threshold()); | |
1327 } | |
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1328 |
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1329 #ifndef PRODUCT |
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1330 |
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1331 void TestOldFreeSpaceCalculation_test() { |
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1332 assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(100, 20) == 25, "Calculation of free memory failed"); |
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1333 assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(100, 50) == 100, "Calculation of free memory failed"); |
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1334 assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(100, 60) == 150, "Calculation of free memory failed"); |
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1335 assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(100, 75) == 300, "Calculation of free memory failed"); |
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1336 assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(400, 20) == 100, "Calculation of free memory failed"); |
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1337 assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(400, 50) == 400, "Calculation of free memory failed"); |
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1338 assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(400, 60) == 600, "Calculation of free memory failed"); |
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1339 assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(400, 75) == 1200, "Calculation of free memory failed"); |
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1340 } |
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1341 |
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1342 #endif /* !PRODUCT */ |