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annotate src/share/vm/gc_implementation/shared/adaptiveSizePolicy.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | 0bfd3fb24150 |
| children | f95d63e2154a |
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| 0 | 1 /* |
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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 * | |
|
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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 #include "incls/_precompiled.incl" | |
| 25 #include "incls/_adaptiveSizePolicy.cpp.incl" | |
| 26 | |
| 27 elapsedTimer AdaptiveSizePolicy::_minor_timer; | |
| 28 elapsedTimer AdaptiveSizePolicy::_major_timer; | |
| 29 | |
| 30 // The throughput goal is implemented as | |
| 31 // _throughput_goal = 1 - ( 1 / (1 + gc_cost_ratio)) | |
| 32 // gc_cost_ratio is the ratio | |
| 33 // application cost / gc cost | |
| 34 // For example a gc_cost_ratio of 4 translates into a | |
| 35 // throughput goal of .80 | |
| 36 | |
| 37 AdaptiveSizePolicy::AdaptiveSizePolicy(size_t init_eden_size, | |
| 38 size_t init_promo_size, | |
| 39 size_t init_survivor_size, | |
| 40 double gc_pause_goal_sec, | |
| 41 uint gc_cost_ratio) : | |
| 42 _eden_size(init_eden_size), | |
| 43 _promo_size(init_promo_size), | |
| 44 _survivor_size(init_survivor_size), | |
| 45 _gc_pause_goal_sec(gc_pause_goal_sec), | |
| 46 _throughput_goal(1.0 - double(1.0 / (1.0 + (double) gc_cost_ratio))), | |
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47 _gc_overhead_limit_exceeded(false), |
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48 _print_gc_overhead_limit_would_be_exceeded(false), |
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49 _gc_overhead_limit_count(0), |
| 0 | 50 _latest_minor_mutator_interval_seconds(0), |
| 51 _threshold_tolerance_percent(1.0 + ThresholdTolerance/100.0), | |
| 52 _young_gen_change_for_minor_throughput(0), | |
| 53 _old_gen_change_for_major_throughput(0) { | |
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54 assert(AdaptiveSizePolicyGCTimeLimitThreshold > 0, |
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55 "No opportunity to clear SoftReferences before GC overhead limit"); |
| 0 | 56 _avg_minor_pause = |
| 57 new AdaptivePaddedAverage(AdaptiveTimeWeight, PausePadding); | |
| 58 _avg_minor_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
| 59 _avg_minor_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
| 60 _avg_major_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
| 61 | |
| 62 _avg_young_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight); | |
| 63 _avg_old_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight); | |
| 64 _avg_eden_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight); | |
| 65 | |
| 66 _avg_survived = new AdaptivePaddedAverage(AdaptiveSizePolicyWeight, | |
| 67 SurvivorPadding); | |
| 68 _avg_pretenured = new AdaptivePaddedNoZeroDevAverage( | |
| 69 AdaptiveSizePolicyWeight, | |
| 70 SurvivorPadding); | |
| 71 | |
| 72 _minor_pause_old_estimator = | |
| 73 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
| 74 _minor_pause_young_estimator = | |
| 75 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
| 76 _minor_collection_estimator = | |
| 77 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
| 78 _major_collection_estimator = | |
| 79 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
| 80 | |
| 81 // Start the timers | |
| 82 _minor_timer.start(); | |
| 83 | |
| 84 _young_gen_policy_is_ready = false; | |
| 85 } | |
| 86 | |
| 87 bool AdaptiveSizePolicy::tenuring_threshold_change() const { | |
| 88 return decrement_tenuring_threshold_for_gc_cost() || | |
| 89 increment_tenuring_threshold_for_gc_cost() || | |
| 90 decrement_tenuring_threshold_for_survivor_limit(); | |
| 91 } | |
| 92 | |
| 93 void AdaptiveSizePolicy::minor_collection_begin() { | |
| 94 // Update the interval time | |
| 95 _minor_timer.stop(); | |
| 96 // Save most recent collection time | |
| 97 _latest_minor_mutator_interval_seconds = _minor_timer.seconds(); | |
| 98 _minor_timer.reset(); | |
| 99 _minor_timer.start(); | |
| 100 } | |
| 101 | |
| 102 void AdaptiveSizePolicy::update_minor_pause_young_estimator( | |
| 103 double minor_pause_in_ms) { | |
| 104 double eden_size_in_mbytes = ((double)_eden_size)/((double)M); | |
| 105 _minor_pause_young_estimator->update(eden_size_in_mbytes, | |
| 106 minor_pause_in_ms); | |
| 107 } | |
| 108 | |
| 109 void AdaptiveSizePolicy::minor_collection_end(GCCause::Cause gc_cause) { | |
| 110 // Update the pause time. | |
| 111 _minor_timer.stop(); | |
| 112 | |
| 113 if (gc_cause != GCCause::_java_lang_system_gc || | |
| 114 UseAdaptiveSizePolicyWithSystemGC) { | |
| 115 double minor_pause_in_seconds = _minor_timer.seconds(); | |
| 116 double minor_pause_in_ms = minor_pause_in_seconds * MILLIUNITS; | |
| 117 | |
| 118 // Sample for performance counter | |
| 119 _avg_minor_pause->sample(minor_pause_in_seconds); | |
| 120 | |
| 121 // Cost of collection (unit-less) | |
| 122 double collection_cost = 0.0; | |
| 123 if ((_latest_minor_mutator_interval_seconds > 0.0) && | |
| 124 (minor_pause_in_seconds > 0.0)) { | |
| 125 double interval_in_seconds = | |
| 126 _latest_minor_mutator_interval_seconds + minor_pause_in_seconds; | |
| 127 collection_cost = | |
| 128 minor_pause_in_seconds / interval_in_seconds; | |
| 129 _avg_minor_gc_cost->sample(collection_cost); | |
| 130 // Sample for performance counter | |
| 131 _avg_minor_interval->sample(interval_in_seconds); | |
| 132 } | |
| 133 | |
| 134 // The policy does not have enough data until at least some | |
| 135 // minor collections have been done. | |
| 136 _young_gen_policy_is_ready = | |
| 137 (_avg_minor_gc_cost->count() >= AdaptiveSizePolicyReadyThreshold); | |
| 138 | |
| 139 // Calculate variables used to estimate pause time vs. gen sizes | |
| 140 double eden_size_in_mbytes = ((double)_eden_size)/((double)M); | |
| 141 update_minor_pause_young_estimator(minor_pause_in_ms); | |
| 142 update_minor_pause_old_estimator(minor_pause_in_ms); | |
| 143 | |
| 144 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 145 gclog_or_tty->print("AdaptiveSizePolicy::minor_collection_end: " | |
| 146 "minor gc cost: %f average: %f", collection_cost, | |
| 147 _avg_minor_gc_cost->average()); | |
| 148 gclog_or_tty->print_cr(" minor pause: %f minor period %f", | |
| 149 minor_pause_in_ms, | |
| 150 _latest_minor_mutator_interval_seconds * MILLIUNITS); | |
| 151 } | |
| 152 | |
| 153 // Calculate variable used to estimate collection cost vs. gen sizes | |
| 154 assert(collection_cost >= 0.0, "Expected to be non-negative"); | |
| 155 _minor_collection_estimator->update(eden_size_in_mbytes, collection_cost); | |
| 156 } | |
| 157 | |
| 158 // Interval times use this timer to measure the mutator time. | |
| 159 // Reset the timer after the GC pause. | |
| 160 _minor_timer.reset(); | |
| 161 _minor_timer.start(); | |
| 162 } | |
| 163 | |
| 164 size_t AdaptiveSizePolicy::eden_increment(size_t cur_eden, | |
| 165 uint percent_change) { | |
| 166 size_t eden_heap_delta; | |
| 167 eden_heap_delta = cur_eden / 100 * percent_change; | |
| 168 return eden_heap_delta; | |
| 169 } | |
| 170 | |
| 171 size_t AdaptiveSizePolicy::eden_increment(size_t cur_eden) { | |
| 172 return eden_increment(cur_eden, YoungGenerationSizeIncrement); | |
| 173 } | |
| 174 | |
| 175 size_t AdaptiveSizePolicy::eden_decrement(size_t cur_eden) { | |
| 176 size_t eden_heap_delta = eden_increment(cur_eden) / | |
| 177 AdaptiveSizeDecrementScaleFactor; | |
| 178 return eden_heap_delta; | |
| 179 } | |
| 180 | |
| 181 size_t AdaptiveSizePolicy::promo_increment(size_t cur_promo, | |
| 182 uint percent_change) { | |
| 183 size_t promo_heap_delta; | |
| 184 promo_heap_delta = cur_promo / 100 * percent_change; | |
| 185 return promo_heap_delta; | |
| 186 } | |
| 187 | |
| 188 size_t AdaptiveSizePolicy::promo_increment(size_t cur_promo) { | |
| 189 return promo_increment(cur_promo, TenuredGenerationSizeIncrement); | |
| 190 } | |
| 191 | |
| 192 size_t AdaptiveSizePolicy::promo_decrement(size_t cur_promo) { | |
| 193 size_t promo_heap_delta = promo_increment(cur_promo); | |
| 194 promo_heap_delta = promo_heap_delta / AdaptiveSizeDecrementScaleFactor; | |
| 195 return promo_heap_delta; | |
| 196 } | |
| 197 | |
| 198 double AdaptiveSizePolicy::time_since_major_gc() const { | |
| 199 _major_timer.stop(); | |
| 200 double result = _major_timer.seconds(); | |
| 201 _major_timer.start(); | |
| 202 return result; | |
| 203 } | |
| 204 | |
| 205 // Linear decay of major gc cost | |
| 206 double AdaptiveSizePolicy::decaying_major_gc_cost() const { | |
| 207 double major_interval = major_gc_interval_average_for_decay(); | |
| 208 double major_gc_cost_average = major_gc_cost(); | |
| 209 double decayed_major_gc_cost = major_gc_cost_average; | |
| 210 if(time_since_major_gc() > 0.0) { | |
| 211 decayed_major_gc_cost = major_gc_cost() * | |
| 212 (((double) AdaptiveSizeMajorGCDecayTimeScale) * major_interval) | |
| 213 / time_since_major_gc(); | |
| 214 } | |
| 215 | |
| 216 // The decayed cost should always be smaller than the | |
| 217 // average cost but the vagaries of finite arithmetic could | |
| 218 // produce a larger value in decayed_major_gc_cost so protect | |
| 219 // against that. | |
| 220 return MIN2(major_gc_cost_average, decayed_major_gc_cost); | |
| 221 } | |
| 222 | |
| 223 // Use a value of the major gc cost that has been decayed | |
| 224 // by the factor | |
| 225 // | |
| 226 // average-interval-between-major-gc * AdaptiveSizeMajorGCDecayTimeScale / | |
| 227 // time-since-last-major-gc | |
| 228 // | |
| 229 // if the average-interval-between-major-gc * AdaptiveSizeMajorGCDecayTimeScale | |
| 230 // is less than time-since-last-major-gc. | |
| 231 // | |
| 232 // In cases where there are initial major gc's that | |
| 233 // are of a relatively high cost but no later major | |
| 234 // gc's, the total gc cost can remain high because | |
| 235 // the major gc cost remains unchanged (since there are no major | |
| 236 // gc's). In such a situation the value of the unchanging | |
| 237 // major gc cost can keep the mutator throughput below | |
| 238 // the goal when in fact the major gc cost is becoming diminishingly | |
| 239 // small. Use the decaying gc cost only to decide whether to | |
| 240 // adjust for throughput. Using it also to determine the adjustment | |
| 241 // to be made for throughput also seems reasonable but there is | |
| 242 // no test case to use to decide if it is the right thing to do | |
| 243 // don't do it yet. | |
| 244 | |
| 245 double AdaptiveSizePolicy::decaying_gc_cost() const { | |
| 246 double decayed_major_gc_cost = major_gc_cost(); | |
| 247 double avg_major_interval = major_gc_interval_average_for_decay(); | |
| 248 if (UseAdaptiveSizeDecayMajorGCCost && | |
| 249 (AdaptiveSizeMajorGCDecayTimeScale > 0) && | |
| 250 (avg_major_interval > 0.00)) { | |
| 251 double time_since_last_major_gc = time_since_major_gc(); | |
| 252 | |
| 253 // Decay the major gc cost? | |
| 254 if (time_since_last_major_gc > | |
| 255 ((double) AdaptiveSizeMajorGCDecayTimeScale) * avg_major_interval) { | |
| 256 | |
| 257 // Decay using the time-since-last-major-gc | |
| 258 decayed_major_gc_cost = decaying_major_gc_cost(); | |
| 259 if (PrintGCDetails && Verbose) { | |
| 260 gclog_or_tty->print_cr("\ndecaying_gc_cost: major interval average:" | |
| 261 " %f time since last major gc: %f", | |
| 262 avg_major_interval, time_since_last_major_gc); | |
| 263 gclog_or_tty->print_cr(" major gc cost: %f decayed major gc cost: %f", | |
| 264 major_gc_cost(), decayed_major_gc_cost); | |
| 265 } | |
| 266 } | |
| 267 } | |
| 268 double result = MIN2(1.0, decayed_major_gc_cost + minor_gc_cost()); | |
| 269 return result; | |
| 270 } | |
| 271 | |
| 272 | |
| 273 void AdaptiveSizePolicy::clear_generation_free_space_flags() { | |
| 274 set_change_young_gen_for_min_pauses(0); | |
| 275 set_change_old_gen_for_maj_pauses(0); | |
| 276 | |
| 277 set_change_old_gen_for_throughput(0); | |
| 278 set_change_young_gen_for_throughput(0); | |
| 279 set_decrease_for_footprint(0); | |
| 280 set_decide_at_full_gc(0); | |
| 281 } | |
| 282 | |
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283 void AdaptiveSizePolicy::check_gc_overhead_limit( |
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284 size_t young_live, |
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285 size_t eden_live, |
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286 size_t max_old_gen_size, |
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287 size_t max_eden_size, |
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288 bool is_full_gc, |
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289 GCCause::Cause gc_cause, |
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290 CollectorPolicy* collector_policy) { |
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291 |
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292 // Ignore explicit GC's. Exiting here does not set the flag and |
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293 // does not reset the count. Updating of the averages for system |
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294 // GC's is still controlled by UseAdaptiveSizePolicyWithSystemGC. |
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295 if (GCCause::is_user_requested_gc(gc_cause) || |
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296 GCCause::is_serviceability_requested_gc(gc_cause)) { |
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297 return; |
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298 } |
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299 // eden_limit is the upper limit on the size of eden based on |
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300 // the maximum size of the young generation and the sizes |
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301 // of the survivor space. |
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302 // The question being asked is whether the gc costs are high |
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303 // and the space being recovered by a collection is low. |
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304 // free_in_young_gen is the free space in the young generation |
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305 // after a collection and promo_live is the free space in the old |
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306 // generation after a collection. |
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307 // |
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308 // Use the minimum of the current value of the live in the |
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309 // young gen or the average of the live in the young gen. |
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310 // If the current value drops quickly, that should be taken |
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311 // into account (i.e., don't trigger if the amount of free |
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312 // space has suddenly jumped up). If the current is much |
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313 // higher than the average, use the average since it represents |
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314 // the longer term behavor. |
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315 const size_t live_in_eden = |
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316 MIN2(eden_live, (size_t) avg_eden_live()->average()); |
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317 const size_t free_in_eden = max_eden_size > live_in_eden ? |
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318 max_eden_size - live_in_eden : 0; |
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319 const size_t free_in_old_gen = (size_t)(max_old_gen_size - avg_old_live()->average()); |
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320 const size_t total_free_limit = free_in_old_gen + free_in_eden; |
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321 const size_t total_mem = max_old_gen_size + max_eden_size; |
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322 const double mem_free_limit = total_mem * (GCHeapFreeLimit/100.0); |
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323 const double mem_free_old_limit = max_old_gen_size * (GCHeapFreeLimit/100.0); |
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324 const double mem_free_eden_limit = max_eden_size * (GCHeapFreeLimit/100.0); |
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325 const double gc_cost_limit = GCTimeLimit/100.0; |
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326 size_t promo_limit = (size_t)(max_old_gen_size - avg_old_live()->average()); |
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327 // But don't force a promo size below the current promo size. Otherwise, |
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328 // the promo size will shrink for no good reason. |
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329 promo_limit = MAX2(promo_limit, _promo_size); |
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330 |
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331 |
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332 if (PrintAdaptiveSizePolicy && (Verbose || |
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333 (free_in_old_gen < (size_t) mem_free_old_limit && |
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334 free_in_eden < (size_t) mem_free_eden_limit))) { |
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335 gclog_or_tty->print_cr( |
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336 "PSAdaptiveSizePolicy::compute_generation_free_space limits:" |
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337 " promo_limit: " SIZE_FORMAT |
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338 " max_eden_size: " SIZE_FORMAT |
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339 " total_free_limit: " SIZE_FORMAT |
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340 " max_old_gen_size: " SIZE_FORMAT |
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341 " max_eden_size: " SIZE_FORMAT |
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342 " mem_free_limit: " SIZE_FORMAT, |
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343 promo_limit, max_eden_size, total_free_limit, |
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344 max_old_gen_size, max_eden_size, |
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345 (size_t) mem_free_limit); |
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346 } |
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347 |
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348 bool print_gc_overhead_limit_would_be_exceeded = false; |
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349 if (is_full_gc) { |
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350 if (gc_cost() > gc_cost_limit && |
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351 free_in_old_gen < (size_t) mem_free_old_limit && |
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352 free_in_eden < (size_t) mem_free_eden_limit) { |
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353 // Collections, on average, are taking too much time, and |
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354 // gc_cost() > gc_cost_limit |
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355 // we have too little space available after a full gc. |
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356 // total_free_limit < mem_free_limit |
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357 // where |
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358 // total_free_limit is the free space available in |
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359 // both generations |
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360 // total_mem is the total space available for allocation |
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361 // in both generations (survivor spaces are not included |
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362 // just as they are not included in eden_limit). |
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363 // mem_free_limit is a fraction of total_mem judged to be an |
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364 // acceptable amount that is still unused. |
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365 // The heap can ask for the value of this variable when deciding |
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366 // whether to thrown an OutOfMemory error. |
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367 // Note that the gc time limit test only works for the collections |
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368 // of the young gen + tenured gen and not for collections of the |
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369 // permanent gen. That is because the calculation of the space |
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370 // freed by the collection is the free space in the young gen + |
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371 // tenured gen. |
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372 // At this point the GC overhead limit is being exceeded. |
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373 inc_gc_overhead_limit_count(); |
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374 if (UseGCOverheadLimit) { |
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375 if (gc_overhead_limit_count() >= |
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376 AdaptiveSizePolicyGCTimeLimitThreshold){ |
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377 // All conditions have been met for throwing an out-of-memory |
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378 set_gc_overhead_limit_exceeded(true); |
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379 // Avoid consecutive OOM due to the gc time limit by resetting |
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380 // the counter. |
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381 reset_gc_overhead_limit_count(); |
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382 } else { |
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383 // The required consecutive collections which exceed the |
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384 // GC time limit may or may not have been reached. We |
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385 // are approaching that condition and so as not to |
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386 // throw an out-of-memory before all SoftRef's have been |
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387 // cleared, set _should_clear_all_soft_refs in CollectorPolicy. |
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388 // The clearing will be done on the next GC. |
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389 bool near_limit = gc_overhead_limit_near(); |
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390 if (near_limit) { |
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391 collector_policy->set_should_clear_all_soft_refs(true); |
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392 if (PrintGCDetails && Verbose) { |
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393 gclog_or_tty->print_cr(" Nearing GC overhead limit, " |
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394 "will be clearing all SoftReference"); |
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395 } |
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396 } |
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397 } |
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398 } |
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399 // Set this even when the overhead limit will not |
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400 // cause an out-of-memory. Diagnostic message indicating |
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401 // that the overhead limit is being exceeded is sometimes |
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402 // printed. |
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403 print_gc_overhead_limit_would_be_exceeded = true; |
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404 |
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405 } else { |
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406 // Did not exceed overhead limits |
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407 reset_gc_overhead_limit_count(); |
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408 } |
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409 } |
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410 |
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411 if (UseGCOverheadLimit && PrintGCDetails && Verbose) { |
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412 if (gc_overhead_limit_exceeded()) { |
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413 gclog_or_tty->print_cr(" GC is exceeding overhead limit " |
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414 "of %d%%", GCTimeLimit); |
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415 reset_gc_overhead_limit_count(); |
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416 } else if (print_gc_overhead_limit_would_be_exceeded) { |
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417 assert(gc_overhead_limit_count() > 0, "Should not be printing"); |
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418 gclog_or_tty->print_cr(" GC would exceed overhead limit " |
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419 "of %d%% %d consecutive time(s)", |
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420 GCTimeLimit, gc_overhead_limit_count()); |
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421 } |
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422 } |
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423 } |
| 0 | 424 // Printing |
| 425 | |
| 426 bool AdaptiveSizePolicy::print_adaptive_size_policy_on(outputStream* st) const { | |
| 427 | |
| 428 // Should only be used with adaptive size policy turned on. | |
| 429 // Otherwise, there may be variables that are undefined. | |
| 430 if (!UseAdaptiveSizePolicy) return false; | |
| 431 | |
| 432 // Print goal for which action is needed. | |
| 433 char* action = NULL; | |
| 434 bool change_for_pause = false; | |
| 435 if ((change_old_gen_for_maj_pauses() == | |
| 436 decrease_old_gen_for_maj_pauses_true) || | |
| 437 (change_young_gen_for_min_pauses() == | |
| 438 decrease_young_gen_for_min_pauses_true)) { | |
| 439 action = (char*) " *** pause time goal ***"; | |
| 440 change_for_pause = true; | |
| 441 } else if ((change_old_gen_for_throughput() == | |
| 442 increase_old_gen_for_throughput_true) || | |
| 443 (change_young_gen_for_throughput() == | |
| 444 increase_young_gen_for_througput_true)) { | |
| 445 action = (char*) " *** throughput goal ***"; | |
| 446 } else if (decrease_for_footprint()) { | |
| 447 action = (char*) " *** reduced footprint ***"; | |
| 448 } else { | |
| 449 // No actions were taken. This can legitimately be the | |
| 450 // situation if not enough data has been gathered to make | |
| 451 // decisions. | |
| 452 return false; | |
| 453 } | |
| 454 | |
| 455 // Pauses | |
| 456 // Currently the size of the old gen is only adjusted to | |
| 457 // change the major pause times. | |
| 458 char* young_gen_action = NULL; | |
| 459 char* tenured_gen_action = NULL; | |
| 460 | |
| 461 char* shrink_msg = (char*) "(attempted to shrink)"; | |
| 462 char* grow_msg = (char*) "(attempted to grow)"; | |
| 463 char* no_change_msg = (char*) "(no change)"; | |
| 464 if (change_young_gen_for_min_pauses() == | |
| 465 decrease_young_gen_for_min_pauses_true) { | |
| 466 young_gen_action = shrink_msg; | |
| 467 } else if (change_for_pause) { | |
| 468 young_gen_action = no_change_msg; | |
| 469 } | |
| 470 | |
| 471 if (change_old_gen_for_maj_pauses() == decrease_old_gen_for_maj_pauses_true) { | |
| 472 tenured_gen_action = shrink_msg; | |
| 473 } else if (change_for_pause) { | |
| 474 tenured_gen_action = no_change_msg; | |
| 475 } | |
| 476 | |
| 477 // Throughput | |
| 478 if (change_old_gen_for_throughput() == increase_old_gen_for_throughput_true) { | |
| 479 assert(change_young_gen_for_throughput() == | |
| 480 increase_young_gen_for_througput_true, | |
| 481 "Both generations should be growing"); | |
| 482 young_gen_action = grow_msg; | |
| 483 tenured_gen_action = grow_msg; | |
| 484 } else if (change_young_gen_for_throughput() == | |
| 485 increase_young_gen_for_througput_true) { | |
| 486 // Only the young generation may grow at start up (before | |
| 487 // enough full collections have been done to grow the old generation). | |
| 488 young_gen_action = grow_msg; | |
| 489 tenured_gen_action = no_change_msg; | |
| 490 } | |
| 491 | |
| 492 // Minimum footprint | |
| 493 if (decrease_for_footprint() != 0) { | |
| 494 young_gen_action = shrink_msg; | |
| 495 tenured_gen_action = shrink_msg; | |
| 496 } | |
| 497 | |
| 498 st->print_cr(" UseAdaptiveSizePolicy actions to meet %s", action); | |
| 499 st->print_cr(" GC overhead (%%)"); | |
| 500 st->print_cr(" Young generation: %7.2f\t %s", | |
| 501 100.0 * avg_minor_gc_cost()->average(), | |
| 502 young_gen_action); | |
| 503 st->print_cr(" Tenured generation: %7.2f\t %s", | |
| 504 100.0 * avg_major_gc_cost()->average(), | |
| 505 tenured_gen_action); | |
| 506 return true; | |
| 507 } | |
| 508 | |
| 509 bool AdaptiveSizePolicy::print_adaptive_size_policy_on( | |
| 510 outputStream* st, | |
| 511 int tenuring_threshold_arg) const { | |
| 512 if (!AdaptiveSizePolicy::print_adaptive_size_policy_on(st)) { | |
| 513 return false; | |
| 514 } | |
| 515 | |
| 516 // Tenuring threshold | |
| 517 bool tenuring_threshold_changed = true; | |
| 518 if (decrement_tenuring_threshold_for_survivor_limit()) { | |
| 519 st->print(" Tenuring threshold: (attempted to decrease to avoid" | |
| 520 " survivor space overflow) = "); | |
| 521 } else if (decrement_tenuring_threshold_for_gc_cost()) { | |
| 522 st->print(" Tenuring threshold: (attempted to decrease to balance" | |
| 523 " GC costs) = "); | |
| 524 } else if (increment_tenuring_threshold_for_gc_cost()) { | |
| 525 st->print(" Tenuring threshold: (attempted to increase to balance" | |
| 526 " GC costs) = "); | |
| 527 } else { | |
| 528 tenuring_threshold_changed = false; | |
| 529 assert(!tenuring_threshold_change(), "(no change was attempted)"); | |
| 530 } | |
| 531 if (tenuring_threshold_changed) { | |
| 532 st->print_cr("%d", tenuring_threshold_arg); | |
| 533 } | |
| 534 return true; | |
| 535 } |