author | brutisso |
Mon, 21 Nov 2011 07:47:34 +0100 | |
changeset 11170 | 7663e46f3a54 |
parent 7397 | 5b173b4ca846 |
child 11174 | fccee5238e70 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "gc_implementation/shared/adaptiveSizePolicy.hpp" |
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#include "gc_interface/gcCause.hpp" |
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#include "memory/collectorPolicy.hpp" |
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#include "runtime/timer.hpp" |
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#include "utilities/ostream.hpp" |
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elapsedTimer AdaptiveSizePolicy::_minor_timer; |
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elapsedTimer AdaptiveSizePolicy::_major_timer; |
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// The throughput goal is implemented as |
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// _throughput_goal = 1 - ( 1 / (1 + gc_cost_ratio)) |
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// gc_cost_ratio is the ratio |
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// application cost / gc cost |
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// For example a gc_cost_ratio of 4 translates into a |
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// throughput goal of .80 |
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AdaptiveSizePolicy::AdaptiveSizePolicy(size_t init_eden_size, |
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size_t init_promo_size, |
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size_t init_survivor_size, |
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double gc_pause_goal_sec, |
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uint gc_cost_ratio) : |
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_eden_size(init_eden_size), |
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_promo_size(init_promo_size), |
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_survivor_size(init_survivor_size), |
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_gc_pause_goal_sec(gc_pause_goal_sec), |
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_throughput_goal(1.0 - double(1.0 / (1.0 + (double) gc_cost_ratio))), |
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_gc_overhead_limit_exceeded(false), |
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_print_gc_overhead_limit_would_be_exceeded(false), |
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_gc_overhead_limit_count(0), |
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_latest_minor_mutator_interval_seconds(0), |
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_threshold_tolerance_percent(1.0 + ThresholdTolerance/100.0), |
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_young_gen_change_for_minor_throughput(0), |
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_old_gen_change_for_major_throughput(0) { |
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assert(AdaptiveSizePolicyGCTimeLimitThreshold > 0, |
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"No opportunity to clear SoftReferences before GC overhead limit"); |
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_avg_minor_pause = |
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new AdaptivePaddedAverage(AdaptiveTimeWeight, PausePadding); |
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_avg_minor_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); |
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_avg_minor_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); |
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_avg_major_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); |
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_avg_young_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight); |
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_avg_old_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight); |
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_avg_eden_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight); |
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_avg_survived = new AdaptivePaddedAverage(AdaptiveSizePolicyWeight, |
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SurvivorPadding); |
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_avg_pretenured = new AdaptivePaddedNoZeroDevAverage( |
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AdaptiveSizePolicyWeight, |
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SurvivorPadding); |
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_minor_pause_old_estimator = |
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new LinearLeastSquareFit(AdaptiveSizePolicyWeight); |
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_minor_pause_young_estimator = |
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new LinearLeastSquareFit(AdaptiveSizePolicyWeight); |
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_minor_collection_estimator = |
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new LinearLeastSquareFit(AdaptiveSizePolicyWeight); |
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_major_collection_estimator = |
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new LinearLeastSquareFit(AdaptiveSizePolicyWeight); |
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// Start the timers |
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_minor_timer.start(); |
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_young_gen_policy_is_ready = false; |
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} |
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bool AdaptiveSizePolicy::tenuring_threshold_change() const { |
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return decrement_tenuring_threshold_for_gc_cost() || |
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increment_tenuring_threshold_for_gc_cost() || |
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decrement_tenuring_threshold_for_survivor_limit(); |
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} |
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void AdaptiveSizePolicy::minor_collection_begin() { |
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// Update the interval time |
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_minor_timer.stop(); |
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// Save most recent collection time |
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_latest_minor_mutator_interval_seconds = _minor_timer.seconds(); |
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_minor_timer.reset(); |
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_minor_timer.start(); |
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} |
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void AdaptiveSizePolicy::update_minor_pause_young_estimator( |
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double minor_pause_in_ms) { |
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double eden_size_in_mbytes = ((double)_eden_size)/((double)M); |
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_minor_pause_young_estimator->update(eden_size_in_mbytes, |
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minor_pause_in_ms); |
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} |
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void AdaptiveSizePolicy::minor_collection_end(GCCause::Cause gc_cause) { |
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// Update the pause time. |
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_minor_timer.stop(); |
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if (gc_cause != GCCause::_java_lang_system_gc || |
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UseAdaptiveSizePolicyWithSystemGC) { |
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double minor_pause_in_seconds = _minor_timer.seconds(); |
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double minor_pause_in_ms = minor_pause_in_seconds * MILLIUNITS; |
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// Sample for performance counter |
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_avg_minor_pause->sample(minor_pause_in_seconds); |
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// Cost of collection (unit-less) |
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double collection_cost = 0.0; |
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if ((_latest_minor_mutator_interval_seconds > 0.0) && |
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(minor_pause_in_seconds > 0.0)) { |
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double interval_in_seconds = |
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_latest_minor_mutator_interval_seconds + minor_pause_in_seconds; |
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collection_cost = |
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minor_pause_in_seconds / interval_in_seconds; |
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_avg_minor_gc_cost->sample(collection_cost); |
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// Sample for performance counter |
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_avg_minor_interval->sample(interval_in_seconds); |
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} |
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// The policy does not have enough data until at least some |
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// minor collections have been done. |
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_young_gen_policy_is_ready = |
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(_avg_minor_gc_cost->count() >= AdaptiveSizePolicyReadyThreshold); |
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// Calculate variables used to estimate pause time vs. gen sizes |
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double eden_size_in_mbytes = ((double)_eden_size)/((double)M); |
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update_minor_pause_young_estimator(minor_pause_in_ms); |
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update_minor_pause_old_estimator(minor_pause_in_ms); |
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if (PrintAdaptiveSizePolicy && Verbose) { |
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gclog_or_tty->print("AdaptiveSizePolicy::minor_collection_end: " |
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"minor gc cost: %f average: %f", collection_cost, |
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_avg_minor_gc_cost->average()); |
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gclog_or_tty->print_cr(" minor pause: %f minor period %f", |
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minor_pause_in_ms, |
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_latest_minor_mutator_interval_seconds * MILLIUNITS); |
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} |
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// Calculate variable used to estimate collection cost vs. gen sizes |
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assert(collection_cost >= 0.0, "Expected to be non-negative"); |
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_minor_collection_estimator->update(eden_size_in_mbytes, collection_cost); |
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} |
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// Interval times use this timer to measure the mutator time. |
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// Reset the timer after the GC pause. |
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_minor_timer.reset(); |
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_minor_timer.start(); |
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} |
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size_t AdaptiveSizePolicy::eden_increment(size_t cur_eden, |
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uint percent_change) { |
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size_t eden_heap_delta; |
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eden_heap_delta = cur_eden / 100 * percent_change; |
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return eden_heap_delta; |
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} |
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size_t AdaptiveSizePolicy::eden_increment(size_t cur_eden) { |
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return eden_increment(cur_eden, YoungGenerationSizeIncrement); |
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} |
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size_t AdaptiveSizePolicy::eden_decrement(size_t cur_eden) { |
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size_t eden_heap_delta = eden_increment(cur_eden) / |
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AdaptiveSizeDecrementScaleFactor; |
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return eden_heap_delta; |
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} |
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size_t AdaptiveSizePolicy::promo_increment(size_t cur_promo, |
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uint percent_change) { |
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size_t promo_heap_delta; |
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promo_heap_delta = cur_promo / 100 * percent_change; |
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return promo_heap_delta; |
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} |
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size_t AdaptiveSizePolicy::promo_increment(size_t cur_promo) { |
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return promo_increment(cur_promo, TenuredGenerationSizeIncrement); |
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} |
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size_t AdaptiveSizePolicy::promo_decrement(size_t cur_promo) { |
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size_t promo_heap_delta = promo_increment(cur_promo); |
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promo_heap_delta = promo_heap_delta / AdaptiveSizeDecrementScaleFactor; |
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return promo_heap_delta; |
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} |
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double AdaptiveSizePolicy::time_since_major_gc() const { |
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_major_timer.stop(); |
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double result = _major_timer.seconds(); |
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_major_timer.start(); |
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return result; |
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} |
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// Linear decay of major gc cost |
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double AdaptiveSizePolicy::decaying_major_gc_cost() const { |
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double major_interval = major_gc_interval_average_for_decay(); |
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double major_gc_cost_average = major_gc_cost(); |
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double decayed_major_gc_cost = major_gc_cost_average; |
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if(time_since_major_gc() > 0.0) { |
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decayed_major_gc_cost = major_gc_cost() * |
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(((double) AdaptiveSizeMajorGCDecayTimeScale) * major_interval) |
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/ time_since_major_gc(); |
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} |
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// The decayed cost should always be smaller than the |
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// average cost but the vagaries of finite arithmetic could |
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// produce a larger value in decayed_major_gc_cost so protect |
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// against that. |
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return MIN2(major_gc_cost_average, decayed_major_gc_cost); |
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} |
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// Use a value of the major gc cost that has been decayed |
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// by the factor |
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// |
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// average-interval-between-major-gc * AdaptiveSizeMajorGCDecayTimeScale / |
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// time-since-last-major-gc |
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// |
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// if the average-interval-between-major-gc * AdaptiveSizeMajorGCDecayTimeScale |
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// is less than time-since-last-major-gc. |
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// |
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// In cases where there are initial major gc's that |
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// are of a relatively high cost but no later major |
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// gc's, the total gc cost can remain high because |
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// the major gc cost remains unchanged (since there are no major |
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// gc's). In such a situation the value of the unchanging |
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// major gc cost can keep the mutator throughput below |
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// the goal when in fact the major gc cost is becoming diminishingly |
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// small. Use the decaying gc cost only to decide whether to |
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// adjust for throughput. Using it also to determine the adjustment |
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// to be made for throughput also seems reasonable but there is |
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// no test case to use to decide if it is the right thing to do |
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// don't do it yet. |
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double AdaptiveSizePolicy::decaying_gc_cost() const { |
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double decayed_major_gc_cost = major_gc_cost(); |
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double avg_major_interval = major_gc_interval_average_for_decay(); |
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if (UseAdaptiveSizeDecayMajorGCCost && |
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(AdaptiveSizeMajorGCDecayTimeScale > 0) && |
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(avg_major_interval > 0.00)) { |
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double time_since_last_major_gc = time_since_major_gc(); |
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// Decay the major gc cost? |
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if (time_since_last_major_gc > |
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((double) AdaptiveSizeMajorGCDecayTimeScale) * avg_major_interval) { |
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// Decay using the time-since-last-major-gc |
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decayed_major_gc_cost = decaying_major_gc_cost(); |
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if (PrintGCDetails && Verbose) { |
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gclog_or_tty->print_cr("\ndecaying_gc_cost: major interval average:" |
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" %f time since last major gc: %f", |
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avg_major_interval, time_since_last_major_gc); |
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gclog_or_tty->print_cr(" major gc cost: %f decayed major gc cost: %f", |
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major_gc_cost(), decayed_major_gc_cost); |
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} |
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} |
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} |
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double result = MIN2(1.0, decayed_major_gc_cost + minor_gc_cost()); |
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return result; |
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} |
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void AdaptiveSizePolicy::clear_generation_free_space_flags() { |
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set_change_young_gen_for_min_pauses(0); |
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set_change_old_gen_for_maj_pauses(0); |
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set_change_old_gen_for_throughput(0); |
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set_change_young_gen_for_throughput(0); |
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set_decrease_for_footprint(0); |
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set_decide_at_full_gc(0); |
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} |
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void AdaptiveSizePolicy::check_gc_overhead_limit( |
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size_t young_live, |
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size_t eden_live, |
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size_t max_old_gen_size, |
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size_t max_eden_size, |
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bool is_full_gc, |
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GCCause::Cause gc_cause, |
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CollectorPolicy* collector_policy) { |
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// Ignore explicit GC's. Exiting here does not set the flag and |
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// does not reset the count. Updating of the averages for system |
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// GC's is still controlled by UseAdaptiveSizePolicyWithSystemGC. |
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if (GCCause::is_user_requested_gc(gc_cause) || |
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GCCause::is_serviceability_requested_gc(gc_cause)) { |
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return; |
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} |
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// eden_limit is the upper limit on the size of eden based on |
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// the maximum size of the young generation and the sizes |
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// of the survivor space. |
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// The question being asked is whether the gc costs are high |
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// and the space being recovered by a collection is low. |
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// free_in_young_gen is the free space in the young generation |
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// after a collection and promo_live is the free space in the old |
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// generation after a collection. |
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// |
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312 |
// Use the minimum of the current value of the live in the |
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313 |
// young gen or the average of the live in the young gen. |
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314 |
// If the current value drops quickly, that should be taken |
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|
315 |
// into account (i.e., don't trigger if the amount of free |
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|
316 |
// space has suddenly jumped up). If the current is much |
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317 |
// higher than the average, use the average since it represents |
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|
318 |
// the longer term behavor. |
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319 |
const size_t live_in_eden = |
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320 |
MIN2(eden_live, (size_t) avg_eden_live()->average()); |
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321 |
const size_t free_in_eden = max_eden_size > live_in_eden ? |
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322 |
max_eden_size - live_in_eden : 0; |
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323 |
const size_t free_in_old_gen = (size_t)(max_old_gen_size - avg_old_live()->average()); |
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324 |
const size_t total_free_limit = free_in_old_gen + free_in_eden; |
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325 |
const size_t total_mem = max_old_gen_size + max_eden_size; |
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326 |
const double mem_free_limit = total_mem * (GCHeapFreeLimit/100.0); |
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327 |
const double mem_free_old_limit = max_old_gen_size * (GCHeapFreeLimit/100.0); |
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328 |
const double mem_free_eden_limit = max_eden_size * (GCHeapFreeLimit/100.0); |
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329 |
const double gc_cost_limit = GCTimeLimit/100.0; |
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|
330 |
size_t promo_limit = (size_t)(max_old_gen_size - avg_old_live()->average()); |
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|
331 |
// But don't force a promo size below the current promo size. Otherwise, |
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|
332 |
// the promo size will shrink for no good reason. |
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|
333 |
promo_limit = MAX2(promo_limit, _promo_size); |
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|
334 |
|
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|
335 |
|
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|
336 |
if (PrintAdaptiveSizePolicy && (Verbose || |
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|
337 |
(free_in_old_gen < (size_t) mem_free_old_limit && |
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|
338 |
free_in_eden < (size_t) mem_free_eden_limit))) { |
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|
339 |
gclog_or_tty->print_cr( |
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|
340 |
"PSAdaptiveSizePolicy::compute_generation_free_space limits:" |
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|
341 |
" promo_limit: " SIZE_FORMAT |
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|
342 |
" max_eden_size: " SIZE_FORMAT |
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|
343 |
" total_free_limit: " SIZE_FORMAT |
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|
344 |
" max_old_gen_size: " SIZE_FORMAT |
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|
345 |
" max_eden_size: " SIZE_FORMAT |
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|
346 |
" mem_free_limit: " SIZE_FORMAT, |
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|
347 |
promo_limit, max_eden_size, total_free_limit, |
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|
348 |
max_old_gen_size, max_eden_size, |
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|
349 |
(size_t) mem_free_limit); |
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|
350 |
} |
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|
351 |
|
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|
352 |
bool print_gc_overhead_limit_would_be_exceeded = false; |
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|
353 |
if (is_full_gc) { |
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|
354 |
if (gc_cost() > gc_cost_limit && |
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|
355 |
free_in_old_gen < (size_t) mem_free_old_limit && |
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|
356 |
free_in_eden < (size_t) mem_free_eden_limit) { |
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|
357 |
// Collections, on average, are taking too much time, and |
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|
358 |
// gc_cost() > gc_cost_limit |
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|
359 |
// we have too little space available after a full gc. |
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|
360 |
// total_free_limit < mem_free_limit |
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|
361 |
// where |
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|
362 |
// total_free_limit is the free space available in |
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|
363 |
// both generations |
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|
364 |
// total_mem is the total space available for allocation |
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|
365 |
// in both generations (survivor spaces are not included |
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|
366 |
// just as they are not included in eden_limit). |
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|
367 |
// mem_free_limit is a fraction of total_mem judged to be an |
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|
368 |
// acceptable amount that is still unused. |
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|
369 |
// The heap can ask for the value of this variable when deciding |
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|
370 |
// whether to thrown an OutOfMemory error. |
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|
371 |
// Note that the gc time limit test only works for the collections |
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|
372 |
// of the young gen + tenured gen and not for collections of the |
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|
373 |
// permanent gen. That is because the calculation of the space |
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|
374 |
// freed by the collection is the free space in the young gen + |
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|
375 |
// tenured gen. |
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|
376 |
// At this point the GC overhead limit is being exceeded. |
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|
377 |
inc_gc_overhead_limit_count(); |
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|
378 |
if (UseGCOverheadLimit) { |
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|
379 |
if (gc_overhead_limit_count() >= |
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|
380 |
AdaptiveSizePolicyGCTimeLimitThreshold){ |
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|
381 |
// All conditions have been met for throwing an out-of-memory |
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|
382 |
set_gc_overhead_limit_exceeded(true); |
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|
383 |
// Avoid consecutive OOM due to the gc time limit by resetting |
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|
384 |
// the counter. |
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|
385 |
reset_gc_overhead_limit_count(); |
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|
386 |
} else { |
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|
387 |
// The required consecutive collections which exceed the |
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|
388 |
// GC time limit may or may not have been reached. We |
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|
389 |
// are approaching that condition and so as not to |
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|
390 |
// throw an out-of-memory before all SoftRef's have been |
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|
391 |
// cleared, set _should_clear_all_soft_refs in CollectorPolicy. |
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|
392 |
// The clearing will be done on the next GC. |
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|
393 |
bool near_limit = gc_overhead_limit_near(); |
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|
394 |
if (near_limit) { |
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|
395 |
collector_policy->set_should_clear_all_soft_refs(true); |
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|
396 |
if (PrintGCDetails && Verbose) { |
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|
397 |
gclog_or_tty->print_cr(" Nearing GC overhead limit, " |
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|
398 |
"will be clearing all SoftReference"); |
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diff
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|
399 |
} |
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jmasa
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diff
changeset
|
400 |
} |
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jmasa
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diff
changeset
|
401 |
} |
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jmasa
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diff
changeset
|
402 |
} |
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|
403 |
// Set this even when the overhead limit will not |
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|
404 |
// cause an out-of-memory. Diagnostic message indicating |
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|
405 |
// that the overhead limit is being exceeded is sometimes |
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|
406 |
// printed. |
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|
407 |
print_gc_overhead_limit_would_be_exceeded = true; |
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changeset
|
408 |
|
95a5c4b89273
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|
409 |
} else { |
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diff
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|
410 |
// Did not exceed overhead limits |
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|
411 |
reset_gc_overhead_limit_count(); |
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changeset
|
412 |
} |
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jmasa
parents:
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diff
changeset
|
413 |
} |
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jmasa
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diff
changeset
|
414 |
|
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changeset
|
415 |
if (UseGCOverheadLimit && PrintGCDetails && Verbose) { |
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|
416 |
if (gc_overhead_limit_exceeded()) { |
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|
417 |
gclog_or_tty->print_cr(" GC is exceeding overhead limit " |
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|
418 |
"of %d%%", GCTimeLimit); |
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|
419 |
reset_gc_overhead_limit_count(); |
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|
420 |
} else if (print_gc_overhead_limit_would_be_exceeded) { |
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|
421 |
assert(gc_overhead_limit_count() > 0, "Should not be printing"); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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|
422 |
gclog_or_tty->print_cr(" GC would exceed overhead limit " |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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|
423 |
"of %d%% %d consecutive time(s)", |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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changeset
|
424 |
GCTimeLimit, gc_overhead_limit_count()); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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changeset
|
425 |
} |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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|
426 |
} |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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|
427 |
} |
1 | 428 |
// Printing |
429 |
||
430 |
bool AdaptiveSizePolicy::print_adaptive_size_policy_on(outputStream* st) const { |
|
431 |
||
432 |
// Should only be used with adaptive size policy turned on. |
|
433 |
// Otherwise, there may be variables that are undefined. |
|
434 |
if (!UseAdaptiveSizePolicy) return false; |
|
435 |
||
436 |
// Print goal for which action is needed. |
|
437 |
char* action = NULL; |
|
438 |
bool change_for_pause = false; |
|
439 |
if ((change_old_gen_for_maj_pauses() == |
|
440 |
decrease_old_gen_for_maj_pauses_true) || |
|
441 |
(change_young_gen_for_min_pauses() == |
|
442 |
decrease_young_gen_for_min_pauses_true)) { |
|
443 |
action = (char*) " *** pause time goal ***"; |
|
444 |
change_for_pause = true; |
|
445 |
} else if ((change_old_gen_for_throughput() == |
|
446 |
increase_old_gen_for_throughput_true) || |
|
447 |
(change_young_gen_for_throughput() == |
|
448 |
increase_young_gen_for_througput_true)) { |
|
449 |
action = (char*) " *** throughput goal ***"; |
|
450 |
} else if (decrease_for_footprint()) { |
|
451 |
action = (char*) " *** reduced footprint ***"; |
|
452 |
} else { |
|
453 |
// No actions were taken. This can legitimately be the |
|
454 |
// situation if not enough data has been gathered to make |
|
455 |
// decisions. |
|
456 |
return false; |
|
457 |
} |
|
458 |
||
459 |
// Pauses |
|
460 |
// Currently the size of the old gen is only adjusted to |
|
461 |
// change the major pause times. |
|
462 |
char* young_gen_action = NULL; |
|
463 |
char* tenured_gen_action = NULL; |
|
464 |
||
465 |
char* shrink_msg = (char*) "(attempted to shrink)"; |
|
466 |
char* grow_msg = (char*) "(attempted to grow)"; |
|
467 |
char* no_change_msg = (char*) "(no change)"; |
|
468 |
if (change_young_gen_for_min_pauses() == |
|
469 |
decrease_young_gen_for_min_pauses_true) { |
|
470 |
young_gen_action = shrink_msg; |
|
471 |
} else if (change_for_pause) { |
|
472 |
young_gen_action = no_change_msg; |
|
473 |
} |
|
474 |
||
475 |
if (change_old_gen_for_maj_pauses() == decrease_old_gen_for_maj_pauses_true) { |
|
476 |
tenured_gen_action = shrink_msg; |
|
477 |
} else if (change_for_pause) { |
|
478 |
tenured_gen_action = no_change_msg; |
|
479 |
} |
|
480 |
||
481 |
// Throughput |
|
482 |
if (change_old_gen_for_throughput() == increase_old_gen_for_throughput_true) { |
|
483 |
assert(change_young_gen_for_throughput() == |
|
484 |
increase_young_gen_for_througput_true, |
|
485 |
"Both generations should be growing"); |
|
486 |
young_gen_action = grow_msg; |
|
487 |
tenured_gen_action = grow_msg; |
|
488 |
} else if (change_young_gen_for_throughput() == |
|
489 |
increase_young_gen_for_througput_true) { |
|
490 |
// Only the young generation may grow at start up (before |
|
491 |
// enough full collections have been done to grow the old generation). |
|
492 |
young_gen_action = grow_msg; |
|
493 |
tenured_gen_action = no_change_msg; |
|
494 |
} |
|
495 |
||
496 |
// Minimum footprint |
|
497 |
if (decrease_for_footprint() != 0) { |
|
498 |
young_gen_action = shrink_msg; |
|
499 |
tenured_gen_action = shrink_msg; |
|
500 |
} |
|
501 |
||
502 |
st->print_cr(" UseAdaptiveSizePolicy actions to meet %s", action); |
|
503 |
st->print_cr(" GC overhead (%%)"); |
|
504 |
st->print_cr(" Young generation: %7.2f\t %s", |
|
505 |
100.0 * avg_minor_gc_cost()->average(), |
|
506 |
young_gen_action); |
|
507 |
st->print_cr(" Tenured generation: %7.2f\t %s", |
|
508 |
100.0 * avg_major_gc_cost()->average(), |
|
509 |
tenured_gen_action); |
|
510 |
return true; |
|
511 |
} |
|
512 |
||
513 |
bool AdaptiveSizePolicy::print_adaptive_size_policy_on( |
|
514 |
outputStream* st, |
|
515 |
int tenuring_threshold_arg) const { |
|
516 |
if (!AdaptiveSizePolicy::print_adaptive_size_policy_on(st)) { |
|
517 |
return false; |
|
518 |
} |
|
519 |
||
520 |
// Tenuring threshold |
|
521 |
bool tenuring_threshold_changed = true; |
|
522 |
if (decrement_tenuring_threshold_for_survivor_limit()) { |
|
523 |
st->print(" Tenuring threshold: (attempted to decrease to avoid" |
|
524 |
" survivor space overflow) = "); |
|
525 |
} else if (decrement_tenuring_threshold_for_gc_cost()) { |
|
526 |
st->print(" Tenuring threshold: (attempted to decrease to balance" |
|
527 |
" GC costs) = "); |
|
528 |
} else if (increment_tenuring_threshold_for_gc_cost()) { |
|
529 |
st->print(" Tenuring threshold: (attempted to increase to balance" |
|
530 |
" GC costs) = "); |
|
531 |
} else { |
|
532 |
tenuring_threshold_changed = false; |
|
533 |
assert(!tenuring_threshold_change(), "(no change was attempted)"); |
|
534 |
} |
|
535 |
if (tenuring_threshold_changed) { |
|
536 |
st->print_cr("%d", tenuring_threshold_arg); |
|
537 |
} |
|
538 |
return true; |
|
539 |
} |