truffle: src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.cpp annotate

annotate src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.cpp @ 10288:eba99d16dc6f

8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy Summary: split up compute_generation_free_space() into two functions: compute_eden_space_size() + compute_old_gen_free_space(), each of which (if needed) can be reused without executing an overhead of the other. Reviewed-by: jmasa, tschatzl Contributed-by: tamao <tao.mao@oracle.com>

author	tamao
date	Wed, 15 May 2013 10:41:22 -0700
parents	22b8d3d181d9
children	14d3f71f831d

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	2 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1387 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1387 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1387 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	25 #include "precompiled.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	26 #include "gc_implementation/parallelScavenge/generationSizer.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	27 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	28 #include "gc_implementation/parallelScavenge/psGCAdaptivePolicyCounters.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	29 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	30 #include "gc_implementation/shared/gcPolicyCounters.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	31 #include "gc_interface/gcCause.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	32 #include "memory/collectorPolicy.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	33 #include "runtime/timer.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	34 #include "utilities/top.hpp"
0 a61af66fc99e Initial load duke parents: diff changeset	35
a61af66fc99e Initial load duke parents: diff changeset	36 #include <math.h>
a61af66fc99e Initial load duke parents: diff changeset	37
a61af66fc99e Initial load duke parents: diff changeset	38 PSAdaptiveSizePolicy::PSAdaptiveSizePolicy(size_t init_eden_size,
a61af66fc99e Initial load duke parents: diff changeset	39 size_t init_promo_size,
a61af66fc99e Initial load duke parents: diff changeset	40 size_t init_survivor_size,
a61af66fc99e Initial load duke parents: diff changeset	41 size_t intra_generation_alignment,
a61af66fc99e Initial load duke parents: diff changeset	42 double gc_pause_goal_sec,
a61af66fc99e Initial load duke parents: diff changeset	43 double gc_minor_pause_goal_sec,
a61af66fc99e Initial load duke parents: diff changeset	44 uint gc_cost_ratio) :
a61af66fc99e Initial load duke parents: diff changeset	45 AdaptiveSizePolicy(init_eden_size,
a61af66fc99e Initial load duke parents: diff changeset	46 init_promo_size,
a61af66fc99e Initial load duke parents: diff changeset	47 init_survivor_size,
a61af66fc99e Initial load duke parents: diff changeset	48 gc_pause_goal_sec,
a61af66fc99e Initial load duke parents: diff changeset	49 gc_cost_ratio),
a61af66fc99e Initial load duke parents: diff changeset	50 _collection_cost_margin_fraction(AdaptiveSizePolicyCollectionCostMargin/
a61af66fc99e Initial load duke parents: diff changeset	51 100.0),
a61af66fc99e Initial load duke parents: diff changeset	52 _intra_generation_alignment(intra_generation_alignment),
a61af66fc99e Initial load duke parents: diff changeset	53 _live_at_last_full_gc(init_promo_size),
a61af66fc99e Initial load duke parents: diff changeset	54 _gc_minor_pause_goal_sec(gc_minor_pause_goal_sec),
a61af66fc99e Initial load duke parents: diff changeset	55 _latest_major_mutator_interval_seconds(0),
a61af66fc99e Initial load duke parents: diff changeset	56 _young_gen_change_for_major_pause_count(0)
a61af66fc99e Initial load duke parents: diff changeset	57 {
a61af66fc99e Initial load duke parents: diff changeset	58 // Sizing policy statistics
a61af66fc99e Initial load duke parents: diff changeset	59 _avg_major_pause =
a61af66fc99e Initial load duke parents: diff changeset	60 new AdaptivePaddedAverage(AdaptiveTimeWeight, PausePadding);
a61af66fc99e Initial load duke parents: diff changeset	61 _avg_minor_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
a61af66fc99e Initial load duke parents: diff changeset	62 _avg_major_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
a61af66fc99e Initial load duke parents: diff changeset	63
a61af66fc99e Initial load duke parents: diff changeset	64 _avg_base_footprint = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight);
a61af66fc99e Initial load duke parents: diff changeset	65 _major_pause_old_estimator =
a61af66fc99e Initial load duke parents: diff changeset	66 new LinearLeastSquareFit(AdaptiveSizePolicyWeight);
a61af66fc99e Initial load duke parents: diff changeset	67 _major_pause_young_estimator =
a61af66fc99e Initial load duke parents: diff changeset	68 new LinearLeastSquareFit(AdaptiveSizePolicyWeight);
a61af66fc99e Initial load duke parents: diff changeset	69 _major_collection_estimator =
a61af66fc99e Initial load duke parents: diff changeset	70 new LinearLeastSquareFit(AdaptiveSizePolicyWeight);
a61af66fc99e Initial load duke parents: diff changeset	71
a61af66fc99e Initial load duke parents: diff changeset	72 _young_gen_size_increment_supplement = YoungGenerationSizeSupplement;
a61af66fc99e Initial load duke parents: diff changeset	73 _old_gen_size_increment_supplement = TenuredGenerationSizeSupplement;
a61af66fc99e Initial load duke parents: diff changeset	74
a61af66fc99e Initial load duke parents: diff changeset	75 // Start the timers
a61af66fc99e Initial load duke parents: diff changeset	76 _major_timer.start();
a61af66fc99e Initial load duke parents: diff changeset	77
a61af66fc99e Initial load duke parents: diff changeset	78 _old_gen_policy_is_ready = false;
a61af66fc99e Initial load duke parents: diff changeset	79 }
a61af66fc99e Initial load duke parents: diff changeset	80
a61af66fc99e Initial load duke parents: diff changeset	81 void PSAdaptiveSizePolicy::major_collection_begin() {
a61af66fc99e Initial load duke parents: diff changeset	82 // Update the interval time
a61af66fc99e Initial load duke parents: diff changeset	83 _major_timer.stop();
a61af66fc99e Initial load duke parents: diff changeset	84 // Save most recent collection time
a61af66fc99e Initial load duke parents: diff changeset	85 _latest_major_mutator_interval_seconds = _major_timer.seconds();
a61af66fc99e Initial load duke parents: diff changeset	86 _major_timer.reset();
a61af66fc99e Initial load duke parents: diff changeset	87 _major_timer.start();
a61af66fc99e Initial load duke parents: diff changeset	88 }
a61af66fc99e Initial load duke parents: diff changeset	89
a61af66fc99e Initial load duke parents: diff changeset	90 void PSAdaptiveSizePolicy::update_minor_pause_old_estimator(
a61af66fc99e Initial load duke parents: diff changeset	91 double minor_pause_in_ms) {
a61af66fc99e Initial load duke parents: diff changeset	92 double promo_size_in_mbytes = ((double)_promo_size)/((double)M);
a61af66fc99e Initial load duke parents: diff changeset	93 _minor_pause_old_estimator->update(promo_size_in_mbytes,
a61af66fc99e Initial load duke parents: diff changeset	94 minor_pause_in_ms);
a61af66fc99e Initial load duke parents: diff changeset	95 }
a61af66fc99e Initial load duke parents: diff changeset	96
a61af66fc99e Initial load duke parents: diff changeset	97 void PSAdaptiveSizePolicy::major_collection_end(size_t amount_live,
a61af66fc99e Initial load duke parents: diff changeset	98 GCCause::Cause gc_cause) {
a61af66fc99e Initial load duke parents: diff changeset	99 // Update the pause time.
a61af66fc99e Initial load duke parents: diff changeset	100 _major_timer.stop();
a61af66fc99e Initial load duke parents: diff changeset	101
a61af66fc99e Initial load duke parents: diff changeset	102 if (gc_cause != GCCause::_java_lang_system_gc \|\|
a61af66fc99e Initial load duke parents: diff changeset	103 UseAdaptiveSizePolicyWithSystemGC) {
a61af66fc99e Initial load duke parents: diff changeset	104 double major_pause_in_seconds = _major_timer.seconds();
a61af66fc99e Initial load duke parents: diff changeset	105 double major_pause_in_ms = major_pause_in_seconds * MILLIUNITS;
a61af66fc99e Initial load duke parents: diff changeset	106
a61af66fc99e Initial load duke parents: diff changeset	107 // Sample for performance counter
a61af66fc99e Initial load duke parents: diff changeset	108 _avg_major_pause->sample(major_pause_in_seconds);
a61af66fc99e Initial load duke parents: diff changeset	109
a61af66fc99e Initial load duke parents: diff changeset	110 // Cost of collection (unit-less)
a61af66fc99e Initial load duke parents: diff changeset	111 double collection_cost = 0.0;
a61af66fc99e Initial load duke parents: diff changeset	112 if ((_latest_major_mutator_interval_seconds > 0.0) &&
a61af66fc99e Initial load duke parents: diff changeset	113 (major_pause_in_seconds > 0.0)) {
a61af66fc99e Initial load duke parents: diff changeset	114 double interval_in_seconds =
a61af66fc99e Initial load duke parents: diff changeset	115 _latest_major_mutator_interval_seconds + major_pause_in_seconds;
a61af66fc99e Initial load duke parents: diff changeset	116 collection_cost =
a61af66fc99e Initial load duke parents: diff changeset	117 major_pause_in_seconds / interval_in_seconds;
a61af66fc99e Initial load duke parents: diff changeset	118 avg_major_gc_cost()->sample(collection_cost);
a61af66fc99e Initial load duke parents: diff changeset	119
a61af66fc99e Initial load duke parents: diff changeset	120 // Sample for performance counter
a61af66fc99e Initial load duke parents: diff changeset	121 _avg_major_interval->sample(interval_in_seconds);
a61af66fc99e Initial load duke parents: diff changeset	122 }
a61af66fc99e Initial load duke parents: diff changeset	123
a61af66fc99e Initial load duke parents: diff changeset	124 // Calculate variables used to estimate pause time vs. gen sizes
a61af66fc99e Initial load duke parents: diff changeset	125 double eden_size_in_mbytes = ((double)_eden_size)/((double)M);
a61af66fc99e Initial load duke parents: diff changeset	126 double promo_size_in_mbytes = ((double)_promo_size)/((double)M);
a61af66fc99e Initial load duke parents: diff changeset	127 _major_pause_old_estimator->update(promo_size_in_mbytes,
a61af66fc99e Initial load duke parents: diff changeset	128 major_pause_in_ms);
a61af66fc99e Initial load duke parents: diff changeset	129 _major_pause_young_estimator->update(eden_size_in_mbytes,
a61af66fc99e Initial load duke parents: diff changeset	130 major_pause_in_ms);
a61af66fc99e Initial load duke parents: diff changeset	131
a61af66fc99e Initial load duke parents: diff changeset	132 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	133 gclog_or_tty->print("psAdaptiveSizePolicy::major_collection_end: "
a61af66fc99e Initial load duke parents: diff changeset	134 "major gc cost: %f average: %f", collection_cost,
a61af66fc99e Initial load duke parents: diff changeset	135 avg_major_gc_cost()->average());
a61af66fc99e Initial load duke parents: diff changeset	136 gclog_or_tty->print_cr(" major pause: %f major period %f",
a61af66fc99e Initial load duke parents: diff changeset	137 major_pause_in_ms,
a61af66fc99e Initial load duke parents: diff changeset	138 _latest_major_mutator_interval_seconds * MILLIUNITS);
a61af66fc99e Initial load duke parents: diff changeset	139 }
a61af66fc99e Initial load duke parents: diff changeset	140
a61af66fc99e Initial load duke parents: diff changeset	141 // Calculate variable used to estimate collection cost vs. gen sizes
a61af66fc99e Initial load duke parents: diff changeset	142 assert(collection_cost >= 0.0, "Expected to be non-negative");
a61af66fc99e Initial load duke parents: diff changeset	143 _major_collection_estimator->update(promo_size_in_mbytes,
a61af66fc99e Initial load duke parents: diff changeset	144 collection_cost);
a61af66fc99e Initial load duke parents: diff changeset	145 }
a61af66fc99e Initial load duke parents: diff changeset	146
a61af66fc99e Initial load duke parents: diff changeset	147 // Update the amount live at the end of a full GC
a61af66fc99e Initial load duke parents: diff changeset	148 _live_at_last_full_gc = amount_live;
a61af66fc99e Initial load duke parents: diff changeset	149
a61af66fc99e Initial load duke parents: diff changeset	150 // The policy does not have enough data until at least some major collections
a61af66fc99e Initial load duke parents: diff changeset	151 // have been done.
a61af66fc99e Initial load duke parents: diff changeset	152 if (_avg_major_pause->count() >= AdaptiveSizePolicyReadyThreshold) {
a61af66fc99e Initial load duke parents: diff changeset	153 _old_gen_policy_is_ready = true;
a61af66fc99e Initial load duke parents: diff changeset	154 }
a61af66fc99e Initial load duke parents: diff changeset	155
a61af66fc99e Initial load duke parents: diff changeset	156 // Interval times use this timer to measure the interval that
a61af66fc99e Initial load duke parents: diff changeset	157 // the mutator runs. Reset after the GC pause has been measured.
a61af66fc99e Initial load duke parents: diff changeset	158 _major_timer.reset();
a61af66fc99e Initial load duke parents: diff changeset	159 _major_timer.start();
a61af66fc99e Initial load duke parents: diff changeset	160 }
a61af66fc99e Initial load duke parents: diff changeset	161
a61af66fc99e Initial load duke parents: diff changeset	162 // If the remaining free space in the old generation is less that
a61af66fc99e Initial load duke parents: diff changeset	163 // that expected to be needed by the next collection, do a full
a61af66fc99e Initial load duke parents: diff changeset	164 // collection now.
a61af66fc99e Initial load duke parents: diff changeset	165 bool PSAdaptiveSizePolicy::should_full_GC(size_t old_free_in_bytes) {
a61af66fc99e Initial load duke parents: diff changeset	166
a61af66fc99e Initial load duke parents: diff changeset	167 // A similar test is done in the scavenge's should_attempt_scavenge(). If
a61af66fc99e Initial load duke parents: diff changeset	168 // this is changed, decide if that test should also be changed.
a61af66fc99e Initial load duke parents: diff changeset	169 bool result = padded_average_promoted_in_bytes() > (float) old_free_in_bytes;
a61af66fc99e Initial load duke parents: diff changeset	170 if (PrintGCDetails && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	171 if (result) {
a61af66fc99e Initial load duke parents: diff changeset	172 gclog_or_tty->print(" full after scavenge: ");
a61af66fc99e Initial load duke parents: diff changeset	173 } else {
a61af66fc99e Initial load duke parents: diff changeset	174 gclog_or_tty->print(" no full after scavenge: ");
a61af66fc99e Initial load duke parents: diff changeset	175 }
a61af66fc99e Initial load duke parents: diff changeset	176 gclog_or_tty->print_cr(" average_promoted " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	177 " padded_average_promoted " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	178 " free in old gen " SIZE_FORMAT,
a61af66fc99e Initial load duke parents: diff changeset	179 (size_t) average_promoted_in_bytes(),
a61af66fc99e Initial load duke parents: diff changeset	180 (size_t) padded_average_promoted_in_bytes(),
a61af66fc99e Initial load duke parents: diff changeset	181 old_free_in_bytes);
a61af66fc99e Initial load duke parents: diff changeset	182 }
a61af66fc99e Initial load duke parents: diff changeset	183 return result;
a61af66fc99e Initial load duke parents: diff changeset	184 }
a61af66fc99e Initial load duke parents: diff changeset	185
a61af66fc99e Initial load duke parents: diff changeset	186 void PSAdaptiveSizePolicy::clear_generation_free_space_flags() {
a61af66fc99e Initial load duke parents: diff changeset	187
a61af66fc99e Initial load duke parents: diff changeset	188 AdaptiveSizePolicy::clear_generation_free_space_flags();
a61af66fc99e Initial load duke parents: diff changeset	189
a61af66fc99e Initial load duke parents: diff changeset	190 set_change_old_gen_for_min_pauses(0);
a61af66fc99e Initial load duke parents: diff changeset	191
a61af66fc99e Initial load duke parents: diff changeset	192 set_change_young_gen_for_maj_pauses(0);
a61af66fc99e Initial load duke parents: diff changeset	193 }
a61af66fc99e Initial load duke parents: diff changeset	194
a61af66fc99e Initial load duke parents: diff changeset	195 // If this is not a full GC, only test and modify the young generation.
a61af66fc99e Initial load duke parents: diff changeset	196
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	197 void PSAdaptiveSizePolicy::compute_generation_free_space(
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	198 size_t young_live,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	199 size_t eden_live,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	200 size_t old_live,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	201 size_t cur_eden,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	202 size_t max_old_gen_size,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	203 size_t max_eden_size,
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	204 bool is_full_gc) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	205 compute_eden_space_size(young_live,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	206 eden_live,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	207 cur_eden,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	208 max_eden_size,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	209 is_full_gc);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	210
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	211 compute_old_gen_free_space(old_live,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	212 cur_eden,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	213 max_old_gen_size,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	214 is_full_gc);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	215 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	216
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	217 void PSAdaptiveSizePolicy::compute_eden_space_size(
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	218 size_t young_live,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	219 size_t eden_live,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	220 size_t cur_eden,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	221 size_t max_eden_size,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	222 bool is_full_gc) {
0 a61af66fc99e Initial load duke parents: diff changeset	223
a61af66fc99e Initial load duke parents: diff changeset	224 // Update statistics
a61af66fc99e Initial load duke parents: diff changeset	225 // Time statistics are updated as we go, update footprint stats here
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 1972 diff changeset	226 _avg_base_footprint->sample(BaseFootPrintEstimate);
0 a61af66fc99e Initial load duke parents: diff changeset	227 avg_young_live()->sample(young_live);
a61af66fc99e Initial load duke parents: diff changeset	228 avg_eden_live()->sample(eden_live);
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	229
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	230 // This code used to return if the policy was not ready , i.e.,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	231 // policy_is_ready() returning false. The intent was that
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	232 // decisions below needed major collection times and so could
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	233 // not be made before two major collections. A consequence was
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	234 // adjustments to the young generation were not done until after
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	235 // two major collections even if the minor collections times
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	236 // exceeded the requested goals. Now let the young generation
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	237 // adjust for the minor collection times. Major collection times
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	238 // will be zero for the first collection and will naturally be
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	239 // ignored. Tenured generation adjustments are only made at the
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	240 // full collections so until the second major collection has
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	241 // been reached, no tenured generation adjustments will be made.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	242
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	243 // Until we know better, desired promotion size uses the last calculation
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	244 size_t desired_promo_size = _promo_size;
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	245
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	246 // Start eden at the current value. The desired value that is stored
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	247 // in _eden_size is not bounded by constraints of the heap and can
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	248 // run away.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	249 //
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	250 // As expected setting desired_eden_size to the current
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	251 // value of desired_eden_size as a starting point
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	252 // caused desired_eden_size to grow way too large and caused
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	253 // an overflow down stream. It may have improved performance in
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	254 // some case but is dangerous.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	255 size_t desired_eden_size = cur_eden;
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	256
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	257 // Cache some values. There's a bit of work getting these, so
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	258 // we might save a little time.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	259 const double major_cost = major_gc_cost();
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	260 const double minor_cost = minor_gc_cost();
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	261
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	262 // This method sets the desired eden size. That plus the
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	263 // desired survivor space sizes sets the desired young generation
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	264 // size. This methods does not know what the desired survivor
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	265 // size is but expects that other policy will attempt to make
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	266 // the survivor sizes compatible with the live data in the
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	267 // young generation. This limit is an estimate of the space left
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	268 // in the young generation after the survivor spaces have been
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	269 // subtracted out.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	270 size_t eden_limit = max_eden_size;
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	271
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	272 const double gc_cost_limit = GCTimeLimit/100.0;
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	273
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	274 // Which way should we go?
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	275 // if pause requirement is not met
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	276 // adjust size of any generation with average paus exceeding
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	277 // the pause limit. Adjust one pause at a time (the larger)
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	278 // and only make adjustments for the major pause at full collections.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	279 // else if throughput requirement not met
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	280 // adjust the size of the generation with larger gc time. Only
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	281 // adjust one generation at a time.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	282 // else
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	283 // adjust down the total heap size. Adjust down the larger of the
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	284 // generations.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	285
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	286 // Add some checks for a threshold for a change. For example,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	287 // a change less than the necessary alignment is probably not worth
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	288 // attempting.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	289
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	290
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	291 if ((_avg_minor_pause->padded_average() > gc_pause_goal_sec()) \|\|
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	292 (_avg_major_pause->padded_average() > gc_pause_goal_sec())) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	293 //
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	294 // Check pauses
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	295 //
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	296 // Make changes only to affect one of the pauses (the larger)
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	297 // at a time.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	298 adjust_eden_for_pause_time(is_full_gc, &desired_promo_size, &desired_eden_size);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	299
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	300 } else if (_avg_minor_pause->padded_average() > gc_minor_pause_goal_sec()) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	301 // Adjust only for the minor pause time goal
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	302 adjust_eden_for_minor_pause_time(is_full_gc, &desired_eden_size);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	303
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	304 } else if(adjusted_mutator_cost() < _throughput_goal) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	305 // This branch used to require that (mutator_cost() > 0.0 in 1.4.2.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	306 // This sometimes resulted in skipping to the minimize footprint
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	307 // code. Change this to try and reduce GC time if mutator time is
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	308 // negative for whatever reason. Or for future consideration,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	309 // bail out of the code if mutator time is negative.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	310 //
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	311 // Throughput
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	312 //
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	313 assert(major_cost >= 0.0, "major cost is < 0.0");
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	314 assert(minor_cost >= 0.0, "minor cost is < 0.0");
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	315 // Try to reduce the GC times.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	316 adjust_eden_for_throughput(is_full_gc, &desired_eden_size);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	317
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	318 } else {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	319
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	320 // Be conservative about reducing the footprint.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	321 // Do a minimum number of major collections first.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	322 // Have reasonable averages for major and minor collections costs.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	323 if (UseAdaptiveSizePolicyFootprintGoal &&
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	324 young_gen_policy_is_ready() &&
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	325 avg_major_gc_cost()->average() >= 0.0 &&
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	326 avg_minor_gc_cost()->average() >= 0.0) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	327 size_t desired_sum = desired_eden_size + desired_promo_size;
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	328 desired_eden_size = adjust_eden_for_footprint(desired_eden_size, desired_sum);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	329 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	330 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	331
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	332 // Note we make the same tests as in the code block below; the code
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	333 // seems a little easier to read with the printing in another block.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	334 if (PrintAdaptiveSizePolicy) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	335 if (desired_eden_size > eden_limit) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	336 gclog_or_tty->print_cr(
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	337 "PSAdaptiveSizePolicy::compute_eden_space_size limits:"
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	338 " desired_eden_size: " SIZE_FORMAT
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	339 " old_eden_size: " SIZE_FORMAT
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	340 " eden_limit: " SIZE_FORMAT
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	341 " cur_eden: " SIZE_FORMAT
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	342 " max_eden_size: " SIZE_FORMAT
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	343 " avg_young_live: " SIZE_FORMAT,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	344 desired_eden_size, _eden_size, eden_limit, cur_eden,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	345 max_eden_size, (size_t)avg_young_live()->average());
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	346 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	347 if (gc_cost() > gc_cost_limit) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	348 gclog_or_tty->print_cr(
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	349 "PSAdaptiveSizePolicy::compute_eden_space_size: gc time limit"
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	350 " gc_cost: %f "
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	351 " GCTimeLimit: %d",
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	352 gc_cost(), GCTimeLimit);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	353 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	354 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	355
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	356 // Align everything and make a final limit check
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	357 const size_t alignment = _intra_generation_alignment;
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	358 desired_eden_size = align_size_up(desired_eden_size, alignment);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	359 desired_eden_size = MAX2(desired_eden_size, alignment);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	360
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	361 eden_limit = align_size_down(eden_limit, alignment);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	362
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	363 // And one last limit check, now that we've aligned things.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	364 if (desired_eden_size > eden_limit) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	365 // If the policy says to get a larger eden but
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	366 // is hitting the limit, don't decrease eden.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	367 // This can lead to a general drifting down of the
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	368 // eden size. Let the tenuring calculation push more
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	369 // into the old gen.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	370 desired_eden_size = MAX2(eden_limit, cur_eden);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	371 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	372
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	373 if (PrintAdaptiveSizePolicy) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	374 // Timing stats
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	375 gclog_or_tty->print(
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	376 "PSAdaptiveSizePolicy::compute_eden_space_size: costs"
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	377 " minor_time: %f"
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	378 " major_cost: %f"
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	379 " mutator_cost: %f"
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	380 " throughput_goal: %f",
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	381 minor_gc_cost(), major_gc_cost(), mutator_cost(),
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	382 _throughput_goal);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	383
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	384 // We give more details if Verbose is set
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	385 if (Verbose) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	386 gclog_or_tty->print( " minor_pause: %f"
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	387 " major_pause: %f"
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	388 " minor_interval: %f"
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	389 " major_interval: %f"
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	390 " pause_goal: %f",
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	391 _avg_minor_pause->padded_average(),
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	392 _avg_major_pause->padded_average(),
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	393 _avg_minor_interval->average(),
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	394 _avg_major_interval->average(),
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	395 gc_pause_goal_sec());
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	396 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	397
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	398 // Footprint stats
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	399 gclog_or_tty->print( " live_space: " SIZE_FORMAT
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	400 " free_space: " SIZE_FORMAT,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	401 live_space(), free_space());
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	402 // More detail
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	403 if (Verbose) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	404 gclog_or_tty->print( " base_footprint: " SIZE_FORMAT
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	405 " avg_young_live: " SIZE_FORMAT
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	406 " avg_old_live: " SIZE_FORMAT,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	407 (size_t)_avg_base_footprint->average(),
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	408 (size_t)avg_young_live()->average(),
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	409 (size_t)avg_old_live()->average());
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	410 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	411
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	412 // And finally, our old and new sizes.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	413 gclog_or_tty->print(" old_eden_size: " SIZE_FORMAT
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	414 " desired_eden_size: " SIZE_FORMAT,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	415 _eden_size, desired_eden_size);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	416 gclog_or_tty->cr();
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	417 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	418
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	419 set_eden_size(desired_eden_size);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	420 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	421
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	422 void PSAdaptiveSizePolicy::compute_old_gen_free_space(
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	423 size_t old_live,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	424 size_t cur_eden,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	425 size_t max_old_gen_size,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	426 bool is_full_gc) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	427
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	428 // Update statistics
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	429 // Time statistics are updated as we go, update footprint stats here
0 a61af66fc99e Initial load duke parents: diff changeset	430 if (is_full_gc) {
a61af66fc99e Initial load duke parents: diff changeset	431 // old_live is only accurate after a full gc
a61af66fc99e Initial load duke parents: diff changeset	432 avg_old_live()->sample(old_live);
a61af66fc99e Initial load duke parents: diff changeset	433 }
a61af66fc99e Initial load duke parents: diff changeset	434
a61af66fc99e Initial load duke parents: diff changeset	435 // This code used to return if the policy was not ready , i.e.,
a61af66fc99e Initial load duke parents: diff changeset	436 // policy_is_ready() returning false. The intent was that
a61af66fc99e Initial load duke parents: diff changeset	437 // decisions below needed major collection times and so could
a61af66fc99e Initial load duke parents: diff changeset	438 // not be made before two major collections. A consequence was
a61af66fc99e Initial load duke parents: diff changeset	439 // adjustments to the young generation were not done until after
a61af66fc99e Initial load duke parents: diff changeset	440 // two major collections even if the minor collections times
a61af66fc99e Initial load duke parents: diff changeset	441 // exceeded the requested goals. Now let the young generation
a61af66fc99e Initial load duke parents: diff changeset	442 // adjust for the minor collection times. Major collection times
a61af66fc99e Initial load duke parents: diff changeset	443 // will be zero for the first collection and will naturally be
a61af66fc99e Initial load duke parents: diff changeset	444 // ignored. Tenured generation adjustments are only made at the
a61af66fc99e Initial load duke parents: diff changeset	445 // full collections so until the second major collection has
a61af66fc99e Initial load duke parents: diff changeset	446 // been reached, no tenured generation adjustments will be made.
a61af66fc99e Initial load duke parents: diff changeset	447
a61af66fc99e Initial load duke parents: diff changeset	448 // Until we know better, desired promotion size uses the last calculation
a61af66fc99e Initial load duke parents: diff changeset	449 size_t desired_promo_size = _promo_size;
a61af66fc99e Initial load duke parents: diff changeset	450
a61af66fc99e Initial load duke parents: diff changeset	451 // Start eden at the current value. The desired value that is stored
a61af66fc99e Initial load duke parents: diff changeset	452 // in _eden_size is not bounded by constraints of the heap and can
a61af66fc99e Initial load duke parents: diff changeset	453 // run away.
a61af66fc99e Initial load duke parents: diff changeset	454 //
a61af66fc99e Initial load duke parents: diff changeset	455 // As expected setting desired_eden_size to the current
a61af66fc99e Initial load duke parents: diff changeset	456 // value of desired_eden_size as a starting point
a61af66fc99e Initial load duke parents: diff changeset	457 // caused desired_eden_size to grow way too large and caused
a61af66fc99e Initial load duke parents: diff changeset	458 // an overflow down stream. It may have improved performance in
a61af66fc99e Initial load duke parents: diff changeset	459 // some case but is dangerous.
a61af66fc99e Initial load duke parents: diff changeset	460 size_t desired_eden_size = cur_eden;
a61af66fc99e Initial load duke parents: diff changeset	461
a61af66fc99e Initial load duke parents: diff changeset	462 // Cache some values. There's a bit of work getting these, so
a61af66fc99e Initial load duke parents: diff changeset	463 // we might save a little time.
a61af66fc99e Initial load duke parents: diff changeset	464 const double major_cost = major_gc_cost();
a61af66fc99e Initial load duke parents: diff changeset	465 const double minor_cost = minor_gc_cost();
a61af66fc99e Initial load duke parents: diff changeset	466
a61af66fc99e Initial load duke parents: diff changeset	467 // Limits on our growth
a61af66fc99e Initial load duke parents: diff changeset	468 size_t promo_limit = (size_t)(max_old_gen_size - avg_old_live()->average());
a61af66fc99e Initial load duke parents: diff changeset	469
a61af66fc99e Initial load duke parents: diff changeset	470 // But don't force a promo size below the current promo size. Otherwise,
a61af66fc99e Initial load duke parents: diff changeset	471 // the promo size will shrink for no good reason.
a61af66fc99e Initial load duke parents: diff changeset	472 promo_limit = MAX2(promo_limit, _promo_size);
a61af66fc99e Initial load duke parents: diff changeset	473
a61af66fc99e Initial load duke parents: diff changeset	474 const double gc_cost_limit = GCTimeLimit/100.0;
a61af66fc99e Initial load duke parents: diff changeset	475
a61af66fc99e Initial load duke parents: diff changeset	476 // Which way should we go?
a61af66fc99e Initial load duke parents: diff changeset	477 // if pause requirement is not met
a61af66fc99e Initial load duke parents: diff changeset	478 // adjust size of any generation with average paus exceeding
a61af66fc99e Initial load duke parents: diff changeset	479 // the pause limit. Adjust one pause at a time (the larger)
a61af66fc99e Initial load duke parents: diff changeset	480 // and only make adjustments for the major pause at full collections.
a61af66fc99e Initial load duke parents: diff changeset	481 // else if throughput requirement not met
a61af66fc99e Initial load duke parents: diff changeset	482 // adjust the size of the generation with larger gc time. Only
a61af66fc99e Initial load duke parents: diff changeset	483 // adjust one generation at a time.
a61af66fc99e Initial load duke parents: diff changeset	484 // else
a61af66fc99e Initial load duke parents: diff changeset	485 // adjust down the total heap size. Adjust down the larger of the
a61af66fc99e Initial load duke parents: diff changeset	486 // generations.
a61af66fc99e Initial load duke parents: diff changeset	487
a61af66fc99e Initial load duke parents: diff changeset	488 // Add some checks for a threshhold for a change. For example,
a61af66fc99e Initial load duke parents: diff changeset	489 // a change less than the necessary alignment is probably not worth
a61af66fc99e Initial load duke parents: diff changeset	490 // attempting.
a61af66fc99e Initial load duke parents: diff changeset	491
a61af66fc99e Initial load duke parents: diff changeset	492 if ((_avg_minor_pause->padded_average() > gc_pause_goal_sec()) \|\|
a61af66fc99e Initial load duke parents: diff changeset	493 (_avg_major_pause->padded_average() > gc_pause_goal_sec())) {
a61af66fc99e Initial load duke parents: diff changeset	494 //
a61af66fc99e Initial load duke parents: diff changeset	495 // Check pauses
a61af66fc99e Initial load duke parents: diff changeset	496 //
a61af66fc99e Initial load duke parents: diff changeset	497 // Make changes only to affect one of the pauses (the larger)
a61af66fc99e Initial load duke parents: diff changeset	498 // at a time.
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	499 if (is_full_gc) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	500 set_decide_at_full_gc(decide_at_full_gc_true);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	501 adjust_promo_for_pause_time(is_full_gc, &desired_promo_size, &desired_eden_size);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	502 }
0 a61af66fc99e Initial load duke parents: diff changeset	503 } else if (_avg_minor_pause->padded_average() > gc_minor_pause_goal_sec()) {
a61af66fc99e Initial load duke parents: diff changeset	504 // Adjust only for the minor pause time goal
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	505 adjust_promo_for_minor_pause_time(is_full_gc, &desired_promo_size, &desired_eden_size);
0 a61af66fc99e Initial load duke parents: diff changeset	506 } else if(adjusted_mutator_cost() < _throughput_goal) {
a61af66fc99e Initial load duke parents: diff changeset	507 // This branch used to require that (mutator_cost() > 0.0 in 1.4.2.
a61af66fc99e Initial load duke parents: diff changeset	508 // This sometimes resulted in skipping to the minimize footprint
a61af66fc99e Initial load duke parents: diff changeset	509 // code. Change this to try and reduce GC time if mutator time is
a61af66fc99e Initial load duke parents: diff changeset	510 // negative for whatever reason. Or for future consideration,
a61af66fc99e Initial load duke parents: diff changeset	511 // bail out of the code if mutator time is negative.
a61af66fc99e Initial load duke parents: diff changeset	512 //
a61af66fc99e Initial load duke parents: diff changeset	513 // Throughput
a61af66fc99e Initial load duke parents: diff changeset	514 //
a61af66fc99e Initial load duke parents: diff changeset	515 assert(major_cost >= 0.0, "major cost is < 0.0");
a61af66fc99e Initial load duke parents: diff changeset	516 assert(minor_cost >= 0.0, "minor cost is < 0.0");
a61af66fc99e Initial load duke parents: diff changeset	517 // Try to reduce the GC times.
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	518 if (is_full_gc) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	519 set_decide_at_full_gc(decide_at_full_gc_true);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	520 adjust_promo_for_throughput(is_full_gc, &desired_promo_size);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	521 }
0 a61af66fc99e Initial load duke parents: diff changeset	522 } else {
a61af66fc99e Initial load duke parents: diff changeset	523
a61af66fc99e Initial load duke parents: diff changeset	524 // Be conservative about reducing the footprint.
a61af66fc99e Initial load duke parents: diff changeset	525 // Do a minimum number of major collections first.
a61af66fc99e Initial load duke parents: diff changeset	526 // Have reasonable averages for major and minor collections costs.
a61af66fc99e Initial load duke parents: diff changeset	527 if (UseAdaptiveSizePolicyFootprintGoal &&
a61af66fc99e Initial load duke parents: diff changeset	528 young_gen_policy_is_ready() &&
a61af66fc99e Initial load duke parents: diff changeset	529 avg_major_gc_cost()->average() >= 0.0 &&
a61af66fc99e Initial load duke parents: diff changeset	530 avg_minor_gc_cost()->average() >= 0.0) {
a61af66fc99e Initial load duke parents: diff changeset	531 if (is_full_gc) {
a61af66fc99e Initial load duke parents: diff changeset	532 set_decide_at_full_gc(decide_at_full_gc_true);
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	533 size_t desired_sum = desired_eden_size + desired_promo_size;
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	534 desired_promo_size = adjust_promo_for_footprint(desired_promo_size, desired_sum);
0 a61af66fc99e Initial load duke parents: diff changeset	535 }
a61af66fc99e Initial load duke parents: diff changeset	536 }
a61af66fc99e Initial load duke parents: diff changeset	537 }
a61af66fc99e Initial load duke parents: diff changeset	538
a61af66fc99e Initial load duke parents: diff changeset	539 // Note we make the same tests as in the code block below; the code
a61af66fc99e Initial load duke parents: diff changeset	540 // seems a little easier to read with the printing in another block.
a61af66fc99e Initial load duke parents: diff changeset	541 if (PrintAdaptiveSizePolicy) {
a61af66fc99e Initial load duke parents: diff changeset	542 if (desired_promo_size > promo_limit) {
a61af66fc99e Initial load duke parents: diff changeset	543 // "free_in_old_gen" was the original value for used for promo_limit
a61af66fc99e Initial load duke parents: diff changeset	544 size_t free_in_old_gen = (size_t)(max_old_gen_size - avg_old_live()->average());
a61af66fc99e Initial load duke parents: diff changeset	545 gclog_or_tty->print_cr(
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	546 "PSAdaptiveSizePolicy::compute_old_gen_free_space limits:"
0 a61af66fc99e Initial load duke parents: diff changeset	547 " desired_promo_size: " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	548 " promo_limit: " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	549 " free_in_old_gen: " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	550 " max_old_gen_size: " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	551 " avg_old_live: " SIZE_FORMAT,
a61af66fc99e Initial load duke parents: diff changeset	552 desired_promo_size, promo_limit, free_in_old_gen,
a61af66fc99e Initial load duke parents: diff changeset	553 max_old_gen_size, (size_t) avg_old_live()->average());
a61af66fc99e Initial load duke parents: diff changeset	554 }
a61af66fc99e Initial load duke parents: diff changeset	555 if (gc_cost() > gc_cost_limit) {
a61af66fc99e Initial load duke parents: diff changeset	556 gclog_or_tty->print_cr(
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	557 "PSAdaptiveSizePolicy::compute_old_gen_free_space: gc time limit"
0 a61af66fc99e Initial load duke parents: diff changeset	558 " gc_cost: %f "
a61af66fc99e Initial load duke parents: diff changeset	559 " GCTimeLimit: %d",
a61af66fc99e Initial load duke parents: diff changeset	560 gc_cost(), GCTimeLimit);
a61af66fc99e Initial load duke parents: diff changeset	561 }
a61af66fc99e Initial load duke parents: diff changeset	562 }
a61af66fc99e Initial load duke parents: diff changeset	563
a61af66fc99e Initial load duke parents: diff changeset	564 // Align everything and make a final limit check
a61af66fc99e Initial load duke parents: diff changeset	565 const size_t alignment = _intra_generation_alignment;
a61af66fc99e Initial load duke parents: diff changeset	566 desired_promo_size = align_size_up(desired_promo_size, alignment);
a61af66fc99e Initial load duke parents: diff changeset	567 desired_promo_size = MAX2(desired_promo_size, alignment);
a61af66fc99e Initial load duke parents: diff changeset	568
a61af66fc99e Initial load duke parents: diff changeset	569 promo_limit = align_size_down(promo_limit, alignment);
a61af66fc99e Initial load duke parents: diff changeset	570
a61af66fc99e Initial load duke parents: diff changeset	571 // And one last limit check, now that we've aligned things.
a61af66fc99e Initial load duke parents: diff changeset	572 desired_promo_size = MIN2(desired_promo_size, promo_limit);
a61af66fc99e Initial load duke parents: diff changeset	573
a61af66fc99e Initial load duke parents: diff changeset	574 if (PrintAdaptiveSizePolicy) {
a61af66fc99e Initial load duke parents: diff changeset	575 // Timing stats
a61af66fc99e Initial load duke parents: diff changeset	576 gclog_or_tty->print(
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	577 "PSAdaptiveSizePolicy::compute_old_gen_free_space: costs"
0 a61af66fc99e Initial load duke parents: diff changeset	578 " minor_time: %f"
a61af66fc99e Initial load duke parents: diff changeset	579 " major_cost: %f"
a61af66fc99e Initial load duke parents: diff changeset	580 " mutator_cost: %f"
a61af66fc99e Initial load duke parents: diff changeset	581 " throughput_goal: %f",
a61af66fc99e Initial load duke parents: diff changeset	582 minor_gc_cost(), major_gc_cost(), mutator_cost(),
a61af66fc99e Initial load duke parents: diff changeset	583 _throughput_goal);
a61af66fc99e Initial load duke parents: diff changeset	584
a61af66fc99e Initial load duke parents: diff changeset	585 // We give more details if Verbose is set
a61af66fc99e Initial load duke parents: diff changeset	586 if (Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	587 gclog_or_tty->print( " minor_pause: %f"
a61af66fc99e Initial load duke parents: diff changeset	588 " major_pause: %f"
a61af66fc99e Initial load duke parents: diff changeset	589 " minor_interval: %f"
a61af66fc99e Initial load duke parents: diff changeset	590 " major_interval: %f"
a61af66fc99e Initial load duke parents: diff changeset	591 " pause_goal: %f",
a61af66fc99e Initial load duke parents: diff changeset	592 _avg_minor_pause->padded_average(),
a61af66fc99e Initial load duke parents: diff changeset	593 _avg_major_pause->padded_average(),
a61af66fc99e Initial load duke parents: diff changeset	594 _avg_minor_interval->average(),
a61af66fc99e Initial load duke parents: diff changeset	595 _avg_major_interval->average(),
a61af66fc99e Initial load duke parents: diff changeset	596 gc_pause_goal_sec());
a61af66fc99e Initial load duke parents: diff changeset	597 }
a61af66fc99e Initial load duke parents: diff changeset	598
a61af66fc99e Initial load duke parents: diff changeset	599 // Footprint stats
a61af66fc99e Initial load duke parents: diff changeset	600 gclog_or_tty->print( " live_space: " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	601 " free_space: " SIZE_FORMAT,
a61af66fc99e Initial load duke parents: diff changeset	602 live_space(), free_space());
a61af66fc99e Initial load duke parents: diff changeset	603 // More detail
a61af66fc99e Initial load duke parents: diff changeset	604 if (Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	605 gclog_or_tty->print( " base_footprint: " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	606 " avg_young_live: " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	607 " avg_old_live: " SIZE_FORMAT,
a61af66fc99e Initial load duke parents: diff changeset	608 (size_t)_avg_base_footprint->average(),
a61af66fc99e Initial load duke parents: diff changeset	609 (size_t)avg_young_live()->average(),
a61af66fc99e Initial load duke parents: diff changeset	610 (size_t)avg_old_live()->average());
a61af66fc99e Initial load duke parents: diff changeset	611 }
a61af66fc99e Initial load duke parents: diff changeset	612
a61af66fc99e Initial load duke parents: diff changeset	613 // And finally, our old and new sizes.
a61af66fc99e Initial load duke parents: diff changeset	614 gclog_or_tty->print(" old_promo_size: " SIZE_FORMAT
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	615 " desired_promo_size: " SIZE_FORMAT,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	616 _promo_size, desired_promo_size);
0 a61af66fc99e Initial load duke parents: diff changeset	617 gclog_or_tty->cr();
a61af66fc99e Initial load duke parents: diff changeset	618 }
a61af66fc99e Initial load duke parents: diff changeset	619
a61af66fc99e Initial load duke parents: diff changeset	620 set_promo_size(desired_promo_size);
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	621 }
0 a61af66fc99e Initial load duke parents: diff changeset	622
a61af66fc99e Initial load duke parents: diff changeset	623 void PSAdaptiveSizePolicy::decay_supplemental_growth(bool is_full_gc) {
a61af66fc99e Initial load duke parents: diff changeset	624 // Decay the supplemental increment? Decay the supplement growth
a61af66fc99e Initial load duke parents: diff changeset	625 // factor even if it is not used. It is only meant to give a boost
a61af66fc99e Initial load duke parents: diff changeset	626 // to the initial growth and if it is not used, then it was not
a61af66fc99e Initial load duke parents: diff changeset	627 // needed.
a61af66fc99e Initial load duke parents: diff changeset	628 if (is_full_gc) {
a61af66fc99e Initial load duke parents: diff changeset	629 // Don't wait for the threshold value for the major collections. If
a61af66fc99e Initial load duke parents: diff changeset	630 // here, the supplemental growth term was used and should decay.
a61af66fc99e Initial load duke parents: diff changeset	631 if ((_avg_major_pause->count() % TenuredGenerationSizeSupplementDecay)
a61af66fc99e Initial load duke parents: diff changeset	632 == 0) {
a61af66fc99e Initial load duke parents: diff changeset	633 _old_gen_size_increment_supplement =
a61af66fc99e Initial load duke parents: diff changeset	634 _old_gen_size_increment_supplement >> 1;
a61af66fc99e Initial load duke parents: diff changeset	635 }
a61af66fc99e Initial load duke parents: diff changeset	636 } else {
a61af66fc99e Initial load duke parents: diff changeset	637 if ((_avg_minor_pause->count() >= AdaptiveSizePolicyReadyThreshold) &&
a61af66fc99e Initial load duke parents: diff changeset	638 (_avg_minor_pause->count() % YoungGenerationSizeSupplementDecay) == 0) {
a61af66fc99e Initial load duke parents: diff changeset	639 _young_gen_size_increment_supplement =
a61af66fc99e Initial load duke parents: diff changeset	640 _young_gen_size_increment_supplement >> 1;
a61af66fc99e Initial load duke parents: diff changeset	641 }
a61af66fc99e Initial load duke parents: diff changeset	642 }
a61af66fc99e Initial load duke parents: diff changeset	643 }
a61af66fc99e Initial load duke parents: diff changeset	644
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	645 void PSAdaptiveSizePolicy::adjust_promo_for_minor_pause_time(bool is_full_gc,
0 a61af66fc99e Initial load duke parents: diff changeset	646 size_t* desired_promo_size_ptr, size_t* desired_eden_size_ptr) {
a61af66fc99e Initial load duke parents: diff changeset	647
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	648 if (PSAdjustTenuredGenForMinorPause) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	649 if (is_full_gc) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	650 set_decide_at_full_gc(decide_at_full_gc_true);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	651 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	652 // If the desired eden size is as small as it will get,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	653 // try to adjust the old gen size.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	654 if (*desired_eden_size_ptr <= _intra_generation_alignment) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	655 // Vary the old gen size to reduce the young gen pause. This
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	656 // may not be a good idea. This is just a test.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	657 if (minor_pause_old_estimator()->decrement_will_decrease()) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	658 set_change_old_gen_for_min_pauses(decrease_old_gen_for_min_pauses_true);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	659 *desired_promo_size_ptr =
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	660 _promo_size - promo_decrement_aligned_down(*desired_promo_size_ptr);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	661 } else {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	662 set_change_old_gen_for_min_pauses(increase_old_gen_for_min_pauses_true);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	663 size_t promo_heap_delta =
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	664 promo_increment_with_supplement_aligned_up(*desired_promo_size_ptr);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	665 if ((*desired_promo_size_ptr + promo_heap_delta) >
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	666 *desired_promo_size_ptr) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	667 *desired_promo_size_ptr =
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	668 _promo_size + promo_heap_delta;
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	669 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	670 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	671 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	672 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	673 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	674
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	675 void PSAdaptiveSizePolicy::adjust_eden_for_minor_pause_time(bool is_full_gc,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	676 size_t* desired_eden_size_ptr) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	677
0 a61af66fc99e Initial load duke parents: diff changeset	678 // Adjust the young generation size to reduce pause time of
a61af66fc99e Initial load duke parents: diff changeset	679 // of collections.
a61af66fc99e Initial load duke parents: diff changeset	680 //
a61af66fc99e Initial load duke parents: diff changeset	681 // The AdaptiveSizePolicyInitializingSteps test is not used
a61af66fc99e Initial load duke parents: diff changeset	682 // here. It has not seemed to be needed but perhaps should
a61af66fc99e Initial load duke parents: diff changeset	683 // be added for consistency.
a61af66fc99e Initial load duke parents: diff changeset	684 if (minor_pause_young_estimator()->decrement_will_decrease()) {
a61af66fc99e Initial load duke parents: diff changeset	685 // reduce eden size
a61af66fc99e Initial load duke parents: diff changeset	686 set_change_young_gen_for_min_pauses(
a61af66fc99e Initial load duke parents: diff changeset	687 decrease_young_gen_for_min_pauses_true);
a61af66fc99e Initial load duke parents: diff changeset	688 desired_eden_size_ptr = desired_eden_size_ptr -
a61af66fc99e Initial load duke parents: diff changeset	689 eden_decrement_aligned_down(*desired_eden_size_ptr);
a61af66fc99e Initial load duke parents: diff changeset	690 } else {
a61af66fc99e Initial load duke parents: diff changeset	691 // EXPERIMENTAL ADJUSTMENT
a61af66fc99e Initial load duke parents: diff changeset	692 // Only record that the estimator indicated such an action.
a61af66fc99e Initial load duke parents: diff changeset	693 // desired_eden_size_ptr = desired_eden_size_ptr + eden_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	694 set_change_young_gen_for_min_pauses(
a61af66fc99e Initial load duke parents: diff changeset	695 increase_young_gen_for_min_pauses_true);
a61af66fc99e Initial load duke parents: diff changeset	696 }
a61af66fc99e Initial load duke parents: diff changeset	697 }
a61af66fc99e Initial load duke parents: diff changeset	698
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	699 void PSAdaptiveSizePolicy::adjust_promo_for_pause_time(bool is_full_gc,
0 a61af66fc99e Initial load duke parents: diff changeset	700 size_t* desired_promo_size_ptr,
a61af66fc99e Initial load duke parents: diff changeset	701 size_t* desired_eden_size_ptr) {
a61af66fc99e Initial load duke parents: diff changeset	702
a61af66fc99e Initial load duke parents: diff changeset	703 size_t promo_heap_delta = 0;
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	704 // Add some checks for a threshold for a change. For example,
0 a61af66fc99e Initial load duke parents: diff changeset	705 // a change less than the required alignment is probably not worth
a61af66fc99e Initial load duke parents: diff changeset	706 // attempting.
a61af66fc99e Initial load duke parents: diff changeset	707
a61af66fc99e Initial load duke parents: diff changeset	708 if (_avg_minor_pause->padded_average() > _avg_major_pause->padded_average()) {
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	709 adjust_promo_for_minor_pause_time(is_full_gc, desired_promo_size_ptr, desired_eden_size_ptr);
0 a61af66fc99e Initial load duke parents: diff changeset	710 // major pause adjustments
a61af66fc99e Initial load duke parents: diff changeset	711 } else if (is_full_gc) {
a61af66fc99e Initial load duke parents: diff changeset	712 // Adjust for the major pause time only at full gc's because the
a61af66fc99e Initial load duke parents: diff changeset	713 // affects of a change can only be seen at full gc's.
a61af66fc99e Initial load duke parents: diff changeset	714
a61af66fc99e Initial load duke parents: diff changeset	715 // Reduce old generation size to reduce pause?
a61af66fc99e Initial load duke parents: diff changeset	716 if (major_pause_old_estimator()->decrement_will_decrease()) {
a61af66fc99e Initial load duke parents: diff changeset	717 // reduce old generation size
a61af66fc99e Initial load duke parents: diff changeset	718 set_change_old_gen_for_maj_pauses(decrease_old_gen_for_maj_pauses_true);
a61af66fc99e Initial load duke parents: diff changeset	719 promo_heap_delta = promo_decrement_aligned_down(*desired_promo_size_ptr);
a61af66fc99e Initial load duke parents: diff changeset	720 *desired_promo_size_ptr = _promo_size - promo_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	721 } else {
a61af66fc99e Initial load duke parents: diff changeset	722 // EXPERIMENTAL ADJUSTMENT
a61af66fc99e Initial load duke parents: diff changeset	723 // Only record that the estimator indicated such an action.
a61af66fc99e Initial load duke parents: diff changeset	724 // *desired_promo_size_ptr = _promo_size +
a61af66fc99e Initial load duke parents: diff changeset	725 // promo_increment_aligned_up(*desired_promo_size_ptr);
a61af66fc99e Initial load duke parents: diff changeset	726 set_change_old_gen_for_maj_pauses(increase_old_gen_for_maj_pauses_true);
a61af66fc99e Initial load duke parents: diff changeset	727 }
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	728 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	729
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	730 if (PrintAdaptiveSizePolicy && Verbose) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	731 gclog_or_tty->print_cr(
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	732 "PSAdaptiveSizePolicy::compute_old_gen_free_space "
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	733 "adjusting gen sizes for major pause (avg %f goal %f). "
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	734 "desired_promo_size " SIZE_FORMAT " promo delta " SIZE_FORMAT,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	735 _avg_major_pause->average(), gc_pause_goal_sec(),
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	736 *desired_promo_size_ptr, promo_heap_delta);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	737 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	738 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	739
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	740 void PSAdaptiveSizePolicy::adjust_eden_for_pause_time(bool is_full_gc,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	741 size_t* desired_promo_size_ptr,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	742 size_t* desired_eden_size_ptr) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	743
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	744 size_t eden_heap_delta = 0;
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	745 // Add some checks for a threshold for a change. For example,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	746 // a change less than the required alignment is probably not worth
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	747 // attempting.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	748 if (_avg_minor_pause->padded_average() > _avg_major_pause->padded_average()) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	749 adjust_eden_for_minor_pause_time(is_full_gc,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	750 desired_eden_size_ptr);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	751 // major pause adjustments
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	752 } else if (is_full_gc) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	753 // Adjust for the major pause time only at full gc's because the
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	754 // affects of a change can only be seen at full gc's.
0 a61af66fc99e Initial load duke parents: diff changeset	755 if (PSAdjustYoungGenForMajorPause) {
a61af66fc99e Initial load duke parents: diff changeset	756 // If the promo size is at the minimum (i.e., the old gen
a61af66fc99e Initial load duke parents: diff changeset	757 // size will not actually decrease), consider changing the
a61af66fc99e Initial load duke parents: diff changeset	758 // young gen size.
a61af66fc99e Initial load duke parents: diff changeset	759 if (*desired_promo_size_ptr < _intra_generation_alignment) {
a61af66fc99e Initial load duke parents: diff changeset	760 // If increasing the young generation will decrease the old gen
a61af66fc99e Initial load duke parents: diff changeset	761 // pause, do it.
a61af66fc99e Initial load duke parents: diff changeset	762 // During startup there is noise in the statistics for deciding
a61af66fc99e Initial load duke parents: diff changeset	763 // on whether to increase or decrease the young gen size. For
a61af66fc99e Initial load duke parents: diff changeset	764 // some number of iterations, just try to increase the young
a61af66fc99e Initial load duke parents: diff changeset	765 // gen size if the major pause is too long to try and establish
a61af66fc99e Initial load duke parents: diff changeset	766 // good statistics for later decisions.
a61af66fc99e Initial load duke parents: diff changeset	767 if (major_pause_young_estimator()->increment_will_decrease() \|\|
a61af66fc99e Initial load duke parents: diff changeset	768 (_young_gen_change_for_major_pause_count
a61af66fc99e Initial load duke parents: diff changeset	769 <= AdaptiveSizePolicyInitializingSteps)) {
a61af66fc99e Initial load duke parents: diff changeset	770 set_change_young_gen_for_maj_pauses(
a61af66fc99e Initial load duke parents: diff changeset	771 increase_young_gen_for_maj_pauses_true);
a61af66fc99e Initial load duke parents: diff changeset	772 eden_heap_delta = eden_increment_aligned_up(*desired_eden_size_ptr);
a61af66fc99e Initial load duke parents: diff changeset	773 *desired_eden_size_ptr = _eden_size + eden_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	774 _young_gen_change_for_major_pause_count++;
a61af66fc99e Initial load duke parents: diff changeset	775 } else {
a61af66fc99e Initial load duke parents: diff changeset	776 // Record that decreasing the young gen size would decrease
a61af66fc99e Initial load duke parents: diff changeset	777 // the major pause
a61af66fc99e Initial load duke parents: diff changeset	778 set_change_young_gen_for_maj_pauses(
a61af66fc99e Initial load duke parents: diff changeset	779 decrease_young_gen_for_maj_pauses_true);
a61af66fc99e Initial load duke parents: diff changeset	780 eden_heap_delta = eden_decrement_aligned_down(*desired_eden_size_ptr);
a61af66fc99e Initial load duke parents: diff changeset	781 *desired_eden_size_ptr = _eden_size - eden_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	782 }
a61af66fc99e Initial load duke parents: diff changeset	783 }
a61af66fc99e Initial load duke parents: diff changeset	784 }
a61af66fc99e Initial load duke parents: diff changeset	785 }
a61af66fc99e Initial load duke parents: diff changeset	786
a61af66fc99e Initial load duke parents: diff changeset	787 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	788 gclog_or_tty->print_cr(
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	789 "PSAdaptiveSizePolicy::compute_eden_space_size "
0 a61af66fc99e Initial load duke parents: diff changeset	790 "adjusting gen sizes for major pause (avg %f goal %f). "
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	791 "desired_eden_size " SIZE_FORMAT " eden delta " SIZE_FORMAT,
0 a61af66fc99e Initial load duke parents: diff changeset	792 _avg_major_pause->average(), gc_pause_goal_sec(),
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	793 *desired_eden_size_ptr, eden_heap_delta);
0 a61af66fc99e Initial load duke parents: diff changeset	794 }
a61af66fc99e Initial load duke parents: diff changeset	795 }
a61af66fc99e Initial load duke parents: diff changeset	796
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	797 void PSAdaptiveSizePolicy::adjust_promo_for_throughput(bool is_full_gc,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	798 size_t* desired_promo_size_ptr) {
0 a61af66fc99e Initial load duke parents: diff changeset	799
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	800 // Add some checks for a threshold for a change. For example,
0 a61af66fc99e Initial load duke parents: diff changeset	801 // a change less than the required alignment is probably not worth
a61af66fc99e Initial load duke parents: diff changeset	802 // attempting.
a61af66fc99e Initial load duke parents: diff changeset	803
a61af66fc99e Initial load duke parents: diff changeset	804 if ((gc_cost() + mutator_cost()) == 0.0) {
a61af66fc99e Initial load duke parents: diff changeset	805 return;
a61af66fc99e Initial load duke parents: diff changeset	806 }
a61af66fc99e Initial load duke parents: diff changeset	807
a61af66fc99e Initial load duke parents: diff changeset	808 if (PrintAdaptiveSizePolicy && Verbose) {
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	809 gclog_or_tty->print("\nPSAdaptiveSizePolicy::adjust_promo_for_throughput("
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	810 "is_full: %d, promo: " SIZE_FORMAT "): ",
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	811 is_full_gc, *desired_promo_size_ptr);
0 a61af66fc99e Initial load duke parents: diff changeset	812 gclog_or_tty->print_cr("mutator_cost %f major_gc_cost %f "
a61af66fc99e Initial load duke parents: diff changeset	813 "minor_gc_cost %f", mutator_cost(), major_gc_cost(), minor_gc_cost());
a61af66fc99e Initial load duke parents: diff changeset	814 }
a61af66fc99e Initial load duke parents: diff changeset	815
a61af66fc99e Initial load duke parents: diff changeset	816 // Tenured generation
a61af66fc99e Initial load duke parents: diff changeset	817 if (is_full_gc) {
a61af66fc99e Initial load duke parents: diff changeset	818 // Calculate the change to use for the tenured gen.
a61af66fc99e Initial load duke parents: diff changeset	819 size_t scaled_promo_heap_delta = 0;
a61af66fc99e Initial load duke parents: diff changeset	820 // Can the increment to the generation be scaled?
a61af66fc99e Initial load duke parents: diff changeset	821 if (gc_cost() >= 0.0 && major_gc_cost() >= 0.0) {
a61af66fc99e Initial load duke parents: diff changeset	822 size_t promo_heap_delta =
a61af66fc99e Initial load duke parents: diff changeset	823 promo_increment_with_supplement_aligned_up(*desired_promo_size_ptr);
a61af66fc99e Initial load duke parents: diff changeset	824 double scale_by_ratio = major_gc_cost() / gc_cost();
a61af66fc99e Initial load duke parents: diff changeset	825 scaled_promo_heap_delta =
a61af66fc99e Initial load duke parents: diff changeset	826 (size_t) (scale_by_ratio * (double) promo_heap_delta);
a61af66fc99e Initial load duke parents: diff changeset	827 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	828 gclog_or_tty->print_cr(
a61af66fc99e Initial load duke parents: diff changeset	829 "Scaled tenured increment: " SIZE_FORMAT " by %f down to "
a61af66fc99e Initial load duke parents: diff changeset	830 SIZE_FORMAT,
a61af66fc99e Initial load duke parents: diff changeset	831 promo_heap_delta, scale_by_ratio, scaled_promo_heap_delta);
a61af66fc99e Initial load duke parents: diff changeset	832 }
a61af66fc99e Initial load duke parents: diff changeset	833 } else if (major_gc_cost() >= 0.0) {
a61af66fc99e Initial load duke parents: diff changeset	834 // Scaling is not going to work. If the major gc time is the
a61af66fc99e Initial load duke parents: diff changeset	835 // larger, give it a full increment.
a61af66fc99e Initial load duke parents: diff changeset	836 if (major_gc_cost() >= minor_gc_cost()) {
a61af66fc99e Initial load duke parents: diff changeset	837 scaled_promo_heap_delta =
a61af66fc99e Initial load duke parents: diff changeset	838 promo_increment_with_supplement_aligned_up(*desired_promo_size_ptr);
a61af66fc99e Initial load duke parents: diff changeset	839 }
a61af66fc99e Initial load duke parents: diff changeset	840 } else {
a61af66fc99e Initial load duke parents: diff changeset	841 // Don't expect to get here but it's ok if it does
a61af66fc99e Initial load duke parents: diff changeset	842 // in the product build since the delta will be 0
a61af66fc99e Initial load duke parents: diff changeset	843 // and nothing will change.
a61af66fc99e Initial load duke parents: diff changeset	844 assert(false, "Unexpected value for gc costs");
a61af66fc99e Initial load duke parents: diff changeset	845 }
a61af66fc99e Initial load duke parents: diff changeset	846
a61af66fc99e Initial load duke parents: diff changeset	847 switch (AdaptiveSizeThroughPutPolicy) {
a61af66fc99e Initial load duke parents: diff changeset	848 case 1:
a61af66fc99e Initial load duke parents: diff changeset	849 // Early in the run the statistics might not be good. Until
a61af66fc99e Initial load duke parents: diff changeset	850 // a specific number of collections have been, use the heuristic
a61af66fc99e Initial load duke parents: diff changeset	851 // that a larger generation size means lower collection costs.
a61af66fc99e Initial load duke parents: diff changeset	852 if (major_collection_estimator()->increment_will_decrease() \|\|
a61af66fc99e Initial load duke parents: diff changeset	853 (_old_gen_change_for_major_throughput
a61af66fc99e Initial load duke parents: diff changeset	854 <= AdaptiveSizePolicyInitializingSteps)) {
a61af66fc99e Initial load duke parents: diff changeset	855 // Increase tenured generation size to reduce major collection cost
a61af66fc99e Initial load duke parents: diff changeset	856 if ((*desired_promo_size_ptr + scaled_promo_heap_delta) >
a61af66fc99e Initial load duke parents: diff changeset	857 *desired_promo_size_ptr) {
a61af66fc99e Initial load duke parents: diff changeset	858 *desired_promo_size_ptr = _promo_size + scaled_promo_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	859 }
a61af66fc99e Initial load duke parents: diff changeset	860 set_change_old_gen_for_throughput(
a61af66fc99e Initial load duke parents: diff changeset	861 increase_old_gen_for_throughput_true);
a61af66fc99e Initial load duke parents: diff changeset	862 _old_gen_change_for_major_throughput++;
a61af66fc99e Initial load duke parents: diff changeset	863 } else {
a61af66fc99e Initial load duke parents: diff changeset	864 // EXPERIMENTAL ADJUSTMENT
a61af66fc99e Initial load duke parents: diff changeset	865 // Record that decreasing the old gen size would decrease
a61af66fc99e Initial load duke parents: diff changeset	866 // the major collection cost but don't do it.
a61af66fc99e Initial load duke parents: diff changeset	867 // *desired_promo_size_ptr = _promo_size -
a61af66fc99e Initial load duke parents: diff changeset	868 // promo_decrement_aligned_down(*desired_promo_size_ptr);
a61af66fc99e Initial load duke parents: diff changeset	869 set_change_old_gen_for_throughput(
a61af66fc99e Initial load duke parents: diff changeset	870 decrease_old_gen_for_throughput_true);
a61af66fc99e Initial load duke parents: diff changeset	871 }
a61af66fc99e Initial load duke parents: diff changeset	872
a61af66fc99e Initial load duke parents: diff changeset	873 break;
a61af66fc99e Initial load duke parents: diff changeset	874 default:
a61af66fc99e Initial load duke parents: diff changeset	875 // Simplest strategy
a61af66fc99e Initial load duke parents: diff changeset	876 if ((*desired_promo_size_ptr + scaled_promo_heap_delta) >
a61af66fc99e Initial load duke parents: diff changeset	877 *desired_promo_size_ptr) {
a61af66fc99e Initial load duke parents: diff changeset	878 desired_promo_size_ptr = desired_promo_size_ptr +
a61af66fc99e Initial load duke parents: diff changeset	879 scaled_promo_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	880 }
a61af66fc99e Initial load duke parents: diff changeset	881 set_change_old_gen_for_throughput(
a61af66fc99e Initial load duke parents: diff changeset	882 increase_old_gen_for_throughput_true);
a61af66fc99e Initial load duke parents: diff changeset	883 _old_gen_change_for_major_throughput++;
a61af66fc99e Initial load duke parents: diff changeset	884 }
a61af66fc99e Initial load duke parents: diff changeset	885
a61af66fc99e Initial load duke parents: diff changeset	886 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	887 gclog_or_tty->print_cr(
a61af66fc99e Initial load duke parents: diff changeset	888 "adjusting tenured gen for throughput (avg %f goal %f). "
a61af66fc99e Initial load duke parents: diff changeset	889 "desired_promo_size " SIZE_FORMAT " promo_delta " SIZE_FORMAT ,
a61af66fc99e Initial load duke parents: diff changeset	890 mutator_cost(), _throughput_goal,
a61af66fc99e Initial load duke parents: diff changeset	891 *desired_promo_size_ptr, scaled_promo_heap_delta);
a61af66fc99e Initial load duke parents: diff changeset	892 }
a61af66fc99e Initial load duke parents: diff changeset	893 }
10288 eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	894 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	895
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	896 void PSAdaptiveSizePolicy::adjust_eden_for_throughput(bool is_full_gc,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	897 size_t* desired_eden_size_ptr) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	898
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	899 // Add some checks for a threshold for a change. For example,
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	900 // a change less than the required alignment is probably not worth
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	901 // attempting.
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	902
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	903 if ((gc_cost() + mutator_cost()) == 0.0) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	904 return;
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	905 }
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	906
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	907 if (PrintAdaptiveSizePolicy && Verbose) {
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	908 gclog_or_tty->print("\nPSAdaptiveSizePolicy::adjust_eden_for_throughput("
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	909 "is_full: %d, cur_eden: " SIZE_FORMAT "): ",
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	910 is_full_gc, *desired_eden_size_ptr);
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	911 gclog_or_tty->print_cr("mutator_cost %f major_gc_cost %f "
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	912 "minor_gc_cost %f", mutator_cost(), major_gc_cost(), minor_gc_cost());
eba99d16dc6f 8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy tamao parents: 6818 diff changeset	913 }
0 a61af66fc99e Initial load duke parents: diff changeset	914
a61af66fc99e Initial load duke parents: diff changeset	915 // Young generation
a61af66fc99e Initial load duke parents: diff changeset	916 size_t scaled_eden_heap_delta = 0;
a61af66fc99e Initial load duke parents: diff changeset	917 // Can the increment to the generation be scaled?
a61af66fc99e Initial load duke parents: diff changeset	918 if (gc_cost() >= 0.0 && minor_gc_cost() >= 0.0) {
a61af66fc99e Initial load duke parents: diff changeset	919 size_t eden_heap_delta =
a61af66fc99e Initial load duke parents: diff changeset	920 eden_increment_with_supplement_aligned_up(*desired_eden_size_ptr);
a61af66fc99e Initial load duke parents: diff changeset	921 double scale_by_ratio = minor_gc_cost() / gc_cost();
a61af66fc99e Initial load duke parents: diff changeset	922 assert(scale_by_ratio <= 1.0 && scale_by_ratio >= 0.0, "Scaling is wrong");
a61af66fc99e Initial load duke parents: diff changeset	923 scaled_eden_heap_delta =
a61af66fc99e Initial load duke parents: diff changeset	924 (size_t) (scale_by_ratio * (double) eden_heap_delta);
a61af66fc99e Initial load duke parents: diff changeset	925 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	926 gclog_or_tty->print_cr(
a61af66fc99e Initial load duke parents: diff changeset	927 "Scaled eden increment: " SIZE_FORMAT " by %f down to "
a61af66fc99e Initial load duke parents: diff changeset	928 SIZE_FORMAT,
a61af66fc99e Initial load duke parents: diff changeset	929 eden_heap_delta, scale_by_ratio, scaled_eden_heap_delta);
a61af66fc99e Initial load duke parents: diff changeset	930 }
a61af66fc99e Initial load duke parents: diff changeset	931 } else if (minor_gc_cost() >= 0.0) {
a61af66fc99e Initial load duke parents: diff changeset	932 // Scaling is not going to work. If the minor gc time is the
a61af66fc99e Initial load duke parents: diff changeset	933 // larger, give it a full increment.
a61af66fc99e Initial load duke parents: diff changeset	934 if (minor_gc_cost() > major_gc_cost()) {
a61af66fc99e Initial load duke parents: diff changeset	935 scaled_eden_heap_delta =
a61af66fc99e Initial load duke parents: diff changeset	936 eden_increment_with_supplement_aligned_up(*desired_eden_size_ptr);
a61af66fc99e Initial load duke parents: diff changeset	937 }
a61af66fc99e Initial load duke parents: diff changeset	938 } else {
a61af66fc99e Initial load duke parents: diff changeset	939 // Don't expect to get here but it's ok if it does
a61af66fc99e Initial load duke parents: diff changeset	940 // in the product build since the delta will be 0
a61af66fc99e Initial load duke parents: diff changeset	941 // and nothing will change.
a61af66fc99e Initial load duke parents: diff changeset	942 assert(false, "Unexpected value for gc costs");
a61af66fc99e Initial load duke parents: diff changeset	943 }
a61af66fc99e Initial load duke parents: diff changeset	944
a61af66fc99e Initial load duke parents: diff changeset	945 // Use a heuristic for some number of collections to give
a61af66fc99e Initial load duke parents: diff changeset	946 // the averages time to settle down.
a61af66fc99e Initial load duke parents: diff changeset	947 switch (AdaptiveSizeThroughPutPolicy) {
a61af66fc99e Initial load duke parents: diff changeset	948 case 1:
a61af66fc99e Initial load duke parents: diff changeset	949 if (minor_collection_estimator()->increment_will_decrease() \|\|
a61af66fc99e Initial load duke parents: diff changeset	950 (_young_gen_change_for_minor_throughput
a61af66fc99e Initial load duke parents: diff changeset	951 <= AdaptiveSizePolicyInitializingSteps)) {
a61af66fc99e Initial load duke parents: diff changeset	952 // Expand young generation size to reduce frequency of
a61af66fc99e Initial load duke parents: diff changeset	953 // of collections.
a61af66fc99e Initial load duke parents: diff changeset	954 if ((*desired_eden_size_ptr + scaled_eden_heap_delta) >
a61af66fc99e Initial load duke parents: diff changeset	955 *desired_eden_size_ptr) {
a61af66fc99e Initial load duke parents: diff changeset	956 *desired_eden_size_ptr =
a61af66fc99e Initial load duke parents: diff changeset	957 *desired_eden_size_ptr + scaled_eden_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	958 }
a61af66fc99e Initial load duke parents: diff changeset	959 set_change_young_gen_for_throughput(
a61af66fc99e Initial load duke parents: diff changeset	960 increase_young_gen_for_througput_true);
a61af66fc99e Initial load duke parents: diff changeset	961 _young_gen_change_for_minor_throughput++;
a61af66fc99e Initial load duke parents: diff changeset	962 } else {
a61af66fc99e Initial load duke parents: diff changeset	963 // EXPERIMENTAL ADJUSTMENT
a61af66fc99e Initial load duke parents: diff changeset	964 // Record that decreasing the young gen size would decrease
a61af66fc99e Initial load duke parents: diff changeset	965 // the minor collection cost but don't do it.
a61af66fc99e Initial load duke parents: diff changeset	966 // *desired_eden_size_ptr = _eden_size -
a61af66fc99e Initial load duke parents: diff changeset	967 // eden_decrement_aligned_down(*desired_eden_size_ptr);
a61af66fc99e Initial load duke parents: diff changeset	968 set_change_young_gen_for_throughput(
a61af66fc99e Initial load duke parents: diff changeset	969 decrease_young_gen_for_througput_true);
a61af66fc99e Initial load duke parents: diff changeset	970 }
a61af66fc99e Initial load duke parents: diff changeset	971 break;
a61af66fc99e Initial load duke parents: diff changeset	972 default:
a61af66fc99e Initial load duke parents: diff changeset	973 if ((*desired_eden_size_ptr + scaled_eden_heap_delta) >
a61af66fc99e Initial load duke parents: diff changeset	974 *desired_eden_size_ptr) {
a61af66fc99e Initial load duke parents: diff changeset	975 *desired_eden_size_ptr =
a61af66fc99e Initial load duke parents: diff changeset	976 *desired_eden_size_ptr + scaled_eden_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	977 }
a61af66fc99e Initial load duke parents: diff changeset	978 set_change_young_gen_for_throughput(
a61af66fc99e Initial load duke parents: diff changeset	979 increase_young_gen_for_througput_true);
a61af66fc99e Initial load duke parents: diff changeset	980 _young_gen_change_for_minor_throughput++;
a61af66fc99e Initial load duke parents: diff changeset	981 }
a61af66fc99e Initial load duke parents: diff changeset	982
a61af66fc99e Initial load duke parents: diff changeset	983 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	984 gclog_or_tty->print_cr(
a61af66fc99e Initial load duke parents: diff changeset	985 "adjusting eden for throughput (avg %f goal %f). desired_eden_size "
a61af66fc99e Initial load duke parents: diff changeset	986 SIZE_FORMAT " eden delta " SIZE_FORMAT "\n",
a61af66fc99e Initial load duke parents: diff changeset	987 mutator_cost(), _throughput_goal,
a61af66fc99e Initial load duke parents: diff changeset	988 *desired_eden_size_ptr, scaled_eden_heap_delta);
a61af66fc99e Initial load duke parents: diff changeset	989 }
a61af66fc99e Initial load duke parents: diff changeset	990 }
a61af66fc99e Initial load duke parents: diff changeset	991
a61af66fc99e Initial load duke parents: diff changeset	992 size_t PSAdaptiveSizePolicy::adjust_promo_for_footprint(
a61af66fc99e Initial load duke parents: diff changeset	993 size_t desired_promo_size, size_t desired_sum) {
a61af66fc99e Initial load duke parents: diff changeset	994 assert(desired_promo_size <= desired_sum, "Inconsistent parameters");
a61af66fc99e Initial load duke parents: diff changeset	995 set_decrease_for_footprint(decrease_old_gen_for_footprint_true);
a61af66fc99e Initial load duke parents: diff changeset	996
a61af66fc99e Initial load duke parents: diff changeset	997 size_t change = promo_decrement(desired_promo_size);
a61af66fc99e Initial load duke parents: diff changeset	998 change = scale_down(change, desired_promo_size, desired_sum);
a61af66fc99e Initial load duke parents: diff changeset	999
a61af66fc99e Initial load duke parents: diff changeset	1000 size_t reduced_size = desired_promo_size - change;
a61af66fc99e Initial load duke parents: diff changeset	1001
a61af66fc99e Initial load duke parents: diff changeset	1002 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	1003 gclog_or_tty->print_cr(
a61af66fc99e Initial load duke parents: diff changeset	1004 "AdaptiveSizePolicy::compute_generation_free_space "
a61af66fc99e Initial load duke parents: diff changeset	1005 "adjusting tenured gen for footprint. "
a61af66fc99e Initial load duke parents: diff changeset	1006 "starting promo size " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	1007 " reduced promo size " SIZE_FORMAT,
a61af66fc99e Initial load duke parents: diff changeset	1008 " promo delta " SIZE_FORMAT,
a61af66fc99e Initial load duke parents: diff changeset	1009 desired_promo_size, reduced_size, change );
a61af66fc99e Initial load duke parents: diff changeset	1010 }
a61af66fc99e Initial load duke parents: diff changeset	1011
a61af66fc99e Initial load duke parents: diff changeset	1012 assert(reduced_size <= desired_promo_size, "Inconsistent result");
a61af66fc99e Initial load duke parents: diff changeset	1013 return reduced_size;
a61af66fc99e Initial load duke parents: diff changeset	1014 }
a61af66fc99e Initial load duke parents: diff changeset	1015
a61af66fc99e Initial load duke parents: diff changeset	1016 size_t PSAdaptiveSizePolicy::adjust_eden_for_footprint(
a61af66fc99e Initial load duke parents: diff changeset	1017 size_t desired_eden_size, size_t desired_sum) {
a61af66fc99e Initial load duke parents: diff changeset	1018 assert(desired_eden_size <= desired_sum, "Inconsistent parameters");
a61af66fc99e Initial load duke parents: diff changeset	1019 set_decrease_for_footprint(decrease_young_gen_for_footprint_true);
a61af66fc99e Initial load duke parents: diff changeset	1020
a61af66fc99e Initial load duke parents: diff changeset	1021 size_t change = eden_decrement(desired_eden_size);
a61af66fc99e Initial load duke parents: diff changeset	1022 change = scale_down(change, desired_eden_size, desired_sum);
a61af66fc99e Initial load duke parents: diff changeset	1023
a61af66fc99e Initial load duke parents: diff changeset	1024 size_t reduced_size = desired_eden_size - change;
a61af66fc99e Initial load duke parents: diff changeset	1025
a61af66fc99e Initial load duke parents: diff changeset	1026 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	1027 gclog_or_tty->print_cr(
a61af66fc99e Initial load duke parents: diff changeset	1028 "AdaptiveSizePolicy::compute_generation_free_space "
a61af66fc99e Initial load duke parents: diff changeset	1029 "adjusting eden for footprint. "
a61af66fc99e Initial load duke parents: diff changeset	1030 " starting eden size " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	1031 " reduced eden size " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	1032 " eden delta " SIZE_FORMAT,
a61af66fc99e Initial load duke parents: diff changeset	1033 desired_eden_size, reduced_size, change);
a61af66fc99e Initial load duke parents: diff changeset	1034 }
a61af66fc99e Initial load duke parents: diff changeset	1035
a61af66fc99e Initial load duke parents: diff changeset	1036 assert(reduced_size <= desired_eden_size, "Inconsistent result");
a61af66fc99e Initial load duke parents: diff changeset	1037 return reduced_size;
a61af66fc99e Initial load duke parents: diff changeset	1038 }
a61af66fc99e Initial load duke parents: diff changeset	1039
a61af66fc99e Initial load duke parents: diff changeset	1040 // Scale down "change" by the factor
a61af66fc99e Initial load duke parents: diff changeset	1041 // part / total
a61af66fc99e Initial load duke parents: diff changeset	1042 // Don't align the results.
a61af66fc99e Initial load duke parents: diff changeset	1043
a61af66fc99e Initial load duke parents: diff changeset	1044 size_t PSAdaptiveSizePolicy::scale_down(size_t change,
a61af66fc99e Initial load duke parents: diff changeset	1045 double part,
a61af66fc99e Initial load duke parents: diff changeset	1046 double total) {
a61af66fc99e Initial load duke parents: diff changeset	1047 assert(part <= total, "Inconsistent input");
a61af66fc99e Initial load duke parents: diff changeset	1048 size_t reduced_change = change;
a61af66fc99e Initial load duke parents: diff changeset	1049 if (total > 0) {
a61af66fc99e Initial load duke parents: diff changeset	1050 double fraction = part / total;
a61af66fc99e Initial load duke parents: diff changeset	1051 reduced_change = (size_t) (fraction * (double) change);
a61af66fc99e Initial load duke parents: diff changeset	1052 }
a61af66fc99e Initial load duke parents: diff changeset	1053 assert(reduced_change <= change, "Inconsistent result");
a61af66fc99e Initial load duke parents: diff changeset	1054 return reduced_change;
a61af66fc99e Initial load duke parents: diff changeset	1055 }
a61af66fc99e Initial load duke parents: diff changeset	1056
a61af66fc99e Initial load duke parents: diff changeset	1057 size_t PSAdaptiveSizePolicy::eden_increment(size_t cur_eden,
a61af66fc99e Initial load duke parents: diff changeset	1058 uint percent_change) {
a61af66fc99e Initial load duke parents: diff changeset	1059 size_t eden_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	1060 eden_heap_delta = cur_eden / 100 * percent_change;
a61af66fc99e Initial load duke parents: diff changeset	1061 return eden_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	1062 }
a61af66fc99e Initial load duke parents: diff changeset	1063
a61af66fc99e Initial load duke parents: diff changeset	1064 size_t PSAdaptiveSizePolicy::eden_increment(size_t cur_eden) {
a61af66fc99e Initial load duke parents: diff changeset	1065 return eden_increment(cur_eden, YoungGenerationSizeIncrement);
a61af66fc99e Initial load duke parents: diff changeset	1066 }
a61af66fc99e Initial load duke parents: diff changeset	1067
a61af66fc99e Initial load duke parents: diff changeset	1068 size_t PSAdaptiveSizePolicy::eden_increment_aligned_up(size_t cur_eden) {
a61af66fc99e Initial load duke parents: diff changeset	1069 size_t result = eden_increment(cur_eden, YoungGenerationSizeIncrement);
a61af66fc99e Initial load duke parents: diff changeset	1070 return align_size_up(result, _intra_generation_alignment);
a61af66fc99e Initial load duke parents: diff changeset	1071 }
a61af66fc99e Initial load duke parents: diff changeset	1072
a61af66fc99e Initial load duke parents: diff changeset	1073 size_t PSAdaptiveSizePolicy::eden_increment_aligned_down(size_t cur_eden) {
a61af66fc99e Initial load duke parents: diff changeset	1074 size_t result = eden_increment(cur_eden);
a61af66fc99e Initial load duke parents: diff changeset	1075 return align_size_down(result, _intra_generation_alignment);
a61af66fc99e Initial load duke parents: diff changeset	1076 }
a61af66fc99e Initial load duke parents: diff changeset	1077
a61af66fc99e Initial load duke parents: diff changeset	1078 size_t PSAdaptiveSizePolicy::eden_increment_with_supplement_aligned_up(
a61af66fc99e Initial load duke parents: diff changeset	1079 size_t cur_eden) {
a61af66fc99e Initial load duke parents: diff changeset	1080 size_t result = eden_increment(cur_eden,
a61af66fc99e Initial load duke parents: diff changeset	1081 YoungGenerationSizeIncrement + _young_gen_size_increment_supplement);
a61af66fc99e Initial load duke parents: diff changeset	1082 return align_size_up(result, _intra_generation_alignment);
a61af66fc99e Initial load duke parents: diff changeset	1083 }
a61af66fc99e Initial load duke parents: diff changeset	1084
a61af66fc99e Initial load duke parents: diff changeset	1085 size_t PSAdaptiveSizePolicy::eden_decrement_aligned_down(size_t cur_eden) {
a61af66fc99e Initial load duke parents: diff changeset	1086 size_t eden_heap_delta = eden_decrement(cur_eden);
a61af66fc99e Initial load duke parents: diff changeset	1087 return align_size_down(eden_heap_delta, _intra_generation_alignment);
a61af66fc99e Initial load duke parents: diff changeset	1088 }
a61af66fc99e Initial load duke parents: diff changeset	1089
a61af66fc99e Initial load duke parents: diff changeset	1090 size_t PSAdaptiveSizePolicy::eden_decrement(size_t cur_eden) {
a61af66fc99e Initial load duke parents: diff changeset	1091 size_t eden_heap_delta = eden_increment(cur_eden) /
a61af66fc99e Initial load duke parents: diff changeset	1092 AdaptiveSizeDecrementScaleFactor;
a61af66fc99e Initial load duke parents: diff changeset	1093 return eden_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	1094 }
a61af66fc99e Initial load duke parents: diff changeset	1095
a61af66fc99e Initial load duke parents: diff changeset	1096 size_t PSAdaptiveSizePolicy::promo_increment(size_t cur_promo,
a61af66fc99e Initial load duke parents: diff changeset	1097 uint percent_change) {
a61af66fc99e Initial load duke parents: diff changeset	1098 size_t promo_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	1099 promo_heap_delta = cur_promo / 100 * percent_change;
a61af66fc99e Initial load duke parents: diff changeset	1100 return promo_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	1101 }
a61af66fc99e Initial load duke parents: diff changeset	1102
a61af66fc99e Initial load duke parents: diff changeset	1103 size_t PSAdaptiveSizePolicy::promo_increment(size_t cur_promo) {
a61af66fc99e Initial load duke parents: diff changeset	1104 return promo_increment(cur_promo, TenuredGenerationSizeIncrement);
a61af66fc99e Initial load duke parents: diff changeset	1105 }
a61af66fc99e Initial load duke parents: diff changeset	1106
a61af66fc99e Initial load duke parents: diff changeset	1107 size_t PSAdaptiveSizePolicy::promo_increment_aligned_up(size_t cur_promo) {
a61af66fc99e Initial load duke parents: diff changeset	1108 size_t result = promo_increment(cur_promo, TenuredGenerationSizeIncrement);
a61af66fc99e Initial load duke parents: diff changeset	1109 return align_size_up(result, _intra_generation_alignment);
a61af66fc99e Initial load duke parents: diff changeset	1110 }
a61af66fc99e Initial load duke parents: diff changeset	1111
a61af66fc99e Initial load duke parents: diff changeset	1112 size_t PSAdaptiveSizePolicy::promo_increment_aligned_down(size_t cur_promo) {
a61af66fc99e Initial load duke parents: diff changeset	1113 size_t result = promo_increment(cur_promo, TenuredGenerationSizeIncrement);
a61af66fc99e Initial load duke parents: diff changeset	1114 return align_size_down(result, _intra_generation_alignment);
a61af66fc99e Initial load duke parents: diff changeset	1115 }
a61af66fc99e Initial load duke parents: diff changeset	1116
a61af66fc99e Initial load duke parents: diff changeset	1117 size_t PSAdaptiveSizePolicy::promo_increment_with_supplement_aligned_up(
a61af66fc99e Initial load duke parents: diff changeset	1118 size_t cur_promo) {
a61af66fc99e Initial load duke parents: diff changeset	1119 size_t result = promo_increment(cur_promo,
a61af66fc99e Initial load duke parents: diff changeset	1120 TenuredGenerationSizeIncrement + _old_gen_size_increment_supplement);
a61af66fc99e Initial load duke parents: diff changeset	1121 return align_size_up(result, _intra_generation_alignment);
a61af66fc99e Initial load duke parents: diff changeset	1122 }
a61af66fc99e Initial load duke parents: diff changeset	1123
a61af66fc99e Initial load duke parents: diff changeset	1124 size_t PSAdaptiveSizePolicy::promo_decrement_aligned_down(size_t cur_promo) {
a61af66fc99e Initial load duke parents: diff changeset	1125 size_t promo_heap_delta = promo_decrement(cur_promo);
a61af66fc99e Initial load duke parents: diff changeset	1126 return align_size_down(promo_heap_delta, _intra_generation_alignment);
a61af66fc99e Initial load duke parents: diff changeset	1127 }
a61af66fc99e Initial load duke parents: diff changeset	1128
a61af66fc99e Initial load duke parents: diff changeset	1129 size_t PSAdaptiveSizePolicy::promo_decrement(size_t cur_promo) {
a61af66fc99e Initial load duke parents: diff changeset	1130 size_t promo_heap_delta = promo_increment(cur_promo);
a61af66fc99e Initial load duke parents: diff changeset	1131 promo_heap_delta = promo_heap_delta / AdaptiveSizeDecrementScaleFactor;
a61af66fc99e Initial load duke parents: diff changeset	1132 return promo_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	1133 }
a61af66fc99e Initial load duke parents: diff changeset	1134
6818 22b8d3d181d9 8000351: Tenuring threshold should be unsigned jwilhelm parents: 6725 diff changeset	1135 uint PSAdaptiveSizePolicy::compute_survivor_space_size_and_threshold(
0 a61af66fc99e Initial load duke parents: diff changeset	1136 bool is_survivor_overflow,
6818 22b8d3d181d9 8000351: Tenuring threshold should be unsigned jwilhelm parents: 6725 diff changeset	1137 uint tenuring_threshold,
0 a61af66fc99e Initial load duke parents: diff changeset	1138 size_t survivor_limit) {
a61af66fc99e Initial load duke parents: diff changeset	1139 assert(survivor_limit >= _intra_generation_alignment,
a61af66fc99e Initial load duke parents: diff changeset	1140 "survivor_limit too small");
a61af66fc99e Initial load duke parents: diff changeset	1141 assert((size_t)align_size_down(survivor_limit, _intra_generation_alignment)
a61af66fc99e Initial load duke parents: diff changeset	1142 == survivor_limit, "survivor_limit not aligned");
a61af66fc99e Initial load duke parents: diff changeset	1143
a61af66fc99e Initial load duke parents: diff changeset	1144 // This method is called even if the tenuring threshold and survivor
a61af66fc99e Initial load duke parents: diff changeset	1145 // spaces are not adjusted so that the averages are sampled above.
a61af66fc99e Initial load duke parents: diff changeset	1146 if (!UsePSAdaptiveSurvivorSizePolicy \|\|
a61af66fc99e Initial load duke parents: diff changeset	1147 !young_gen_policy_is_ready()) {
a61af66fc99e Initial load duke parents: diff changeset	1148 return tenuring_threshold;
a61af66fc99e Initial load duke parents: diff changeset	1149 }
a61af66fc99e Initial load duke parents: diff changeset	1150
a61af66fc99e Initial load duke parents: diff changeset	1151 // We'll decide whether to increase or decrease the tenuring
a61af66fc99e Initial load duke parents: diff changeset	1152 // threshold based partly on the newly computed survivor size
a61af66fc99e Initial load duke parents: diff changeset	1153 // (if we hit the maximum limit allowed, we'll always choose to
a61af66fc99e Initial load duke parents: diff changeset	1154 // decrement the threshold).
a61af66fc99e Initial load duke parents: diff changeset	1155 bool incr_tenuring_threshold = false;
a61af66fc99e Initial load duke parents: diff changeset	1156 bool decr_tenuring_threshold = false;
a61af66fc99e Initial load duke parents: diff changeset	1157
a61af66fc99e Initial load duke parents: diff changeset	1158 set_decrement_tenuring_threshold_for_gc_cost(false);
a61af66fc99e Initial load duke parents: diff changeset	1159 set_increment_tenuring_threshold_for_gc_cost(false);
a61af66fc99e Initial load duke parents: diff changeset	1160 set_decrement_tenuring_threshold_for_survivor_limit(false);
a61af66fc99e Initial load duke parents: diff changeset	1161
a61af66fc99e Initial load duke parents: diff changeset	1162 if (!is_survivor_overflow) {
a61af66fc99e Initial load duke parents: diff changeset	1163 // Keep running averages on how much survived
a61af66fc99e Initial load duke parents: diff changeset	1164
a61af66fc99e Initial load duke parents: diff changeset	1165 // We use the tenuring threshold to equalize the cost of major
a61af66fc99e Initial load duke parents: diff changeset	1166 // and minor collections.
a61af66fc99e Initial load duke parents: diff changeset	1167 // ThresholdTolerance is used to indicate how sensitive the
a61af66fc99e Initial load duke parents: diff changeset	1168 // tenuring threshold is to differences in cost betweent the
a61af66fc99e Initial load duke parents: diff changeset	1169 // collection types.
a61af66fc99e Initial load duke parents: diff changeset	1170
a61af66fc99e Initial load duke parents: diff changeset	1171 // Get the times of interest. This involves a little work, so
a61af66fc99e Initial load duke parents: diff changeset	1172 // we cache the values here.
a61af66fc99e Initial load duke parents: diff changeset	1173 const double major_cost = major_gc_cost();
a61af66fc99e Initial load duke parents: diff changeset	1174 const double minor_cost = minor_gc_cost();
a61af66fc99e Initial load duke parents: diff changeset	1175
a61af66fc99e Initial load duke parents: diff changeset	1176 if (minor_cost > major_cost * _threshold_tolerance_percent) {
a61af66fc99e Initial load duke parents: diff changeset	1177 // Minor times are getting too long; lower the threshold so
a61af66fc99e Initial load duke parents: diff changeset	1178 // less survives and more is promoted.
a61af66fc99e Initial load duke parents: diff changeset	1179 decr_tenuring_threshold = true;
a61af66fc99e Initial load duke parents: diff changeset	1180 set_decrement_tenuring_threshold_for_gc_cost(true);
a61af66fc99e Initial load duke parents: diff changeset	1181 } else if (major_cost > minor_cost * _threshold_tolerance_percent) {
a61af66fc99e Initial load duke parents: diff changeset	1182 // Major times are too long, so we want less promotion.
a61af66fc99e Initial load duke parents: diff changeset	1183 incr_tenuring_threshold = true;
a61af66fc99e Initial load duke parents: diff changeset	1184 set_increment_tenuring_threshold_for_gc_cost(true);
a61af66fc99e Initial load duke parents: diff changeset	1185 }
a61af66fc99e Initial load duke parents: diff changeset	1186
a61af66fc99e Initial load duke parents: diff changeset	1187 } else {
a61af66fc99e Initial load duke parents: diff changeset	1188 // Survivor space overflow occurred, so promoted and survived are
a61af66fc99e Initial load duke parents: diff changeset	1189 // not accurate. We'll make our best guess by combining survived
a61af66fc99e Initial load duke parents: diff changeset	1190 // and promoted and count them as survivors.
a61af66fc99e Initial load duke parents: diff changeset	1191 //
a61af66fc99e Initial load duke parents: diff changeset	1192 // We'll lower the tenuring threshold to see if we can correct
a61af66fc99e Initial load duke parents: diff changeset	1193 // things. Also, set the survivor size conservatively. We're
a61af66fc99e Initial load duke parents: diff changeset	1194 // trying to avoid many overflows from occurring if defnew size
a61af66fc99e Initial load duke parents: diff changeset	1195 // is just too small.
a61af66fc99e Initial load duke parents: diff changeset	1196
a61af66fc99e Initial load duke parents: diff changeset	1197 decr_tenuring_threshold = true;
a61af66fc99e Initial load duke parents: diff changeset	1198 }
a61af66fc99e Initial load duke parents: diff changeset	1199
a61af66fc99e Initial load duke parents: diff changeset	1200 // The padded average also maintains a deviation from the average;
a61af66fc99e Initial load duke parents: diff changeset	1201 // we use this to see how good of an estimate we have of what survived.
a61af66fc99e Initial load duke parents: diff changeset	1202 // We're trying to pad the survivor size as little as possible without
a61af66fc99e Initial load duke parents: diff changeset	1203 // overflowing the survivor spaces.
a61af66fc99e Initial load duke parents: diff changeset	1204 size_t target_size = align_size_up((size_t)_avg_survived->padded_average(),
a61af66fc99e Initial load duke parents: diff changeset	1205 _intra_generation_alignment);
a61af66fc99e Initial load duke parents: diff changeset	1206 target_size = MAX2(target_size, _intra_generation_alignment);
a61af66fc99e Initial load duke parents: diff changeset	1207
a61af66fc99e Initial load duke parents: diff changeset	1208 if (target_size > survivor_limit) {
a61af66fc99e Initial load duke parents: diff changeset	1209 // Target size is bigger than we can handle. Let's also reduce
a61af66fc99e Initial load duke parents: diff changeset	1210 // the tenuring threshold.
a61af66fc99e Initial load duke parents: diff changeset	1211 target_size = survivor_limit;
a61af66fc99e Initial load duke parents: diff changeset	1212 decr_tenuring_threshold = true;
a61af66fc99e Initial load duke parents: diff changeset	1213 set_decrement_tenuring_threshold_for_survivor_limit(true);
a61af66fc99e Initial load duke parents: diff changeset	1214 }
a61af66fc99e Initial load duke parents: diff changeset	1215
a61af66fc99e Initial load duke parents: diff changeset	1216 // Finally, increment or decrement the tenuring threshold, as decided above.
a61af66fc99e Initial load duke parents: diff changeset	1217 // We test for decrementing first, as we might have hit the target size
a61af66fc99e Initial load duke parents: diff changeset	1218 // limit.
a61af66fc99e Initial load duke parents: diff changeset	1219 if (decr_tenuring_threshold && !(AlwaysTenure \|\| NeverTenure)) {
a61af66fc99e Initial load duke parents: diff changeset	1220 if (tenuring_threshold > 1) {
a61af66fc99e Initial load duke parents: diff changeset	1221 tenuring_threshold--;
a61af66fc99e Initial load duke parents: diff changeset	1222 }
a61af66fc99e Initial load duke parents: diff changeset	1223 } else if (incr_tenuring_threshold && !(AlwaysTenure \|\| NeverTenure)) {
a61af66fc99e Initial load duke parents: diff changeset	1224 if (tenuring_threshold < MaxTenuringThreshold) {
a61af66fc99e Initial load duke parents: diff changeset	1225 tenuring_threshold++;
a61af66fc99e Initial load duke parents: diff changeset	1226 }
a61af66fc99e Initial load duke parents: diff changeset	1227 }
a61af66fc99e Initial load duke parents: diff changeset	1228
a61af66fc99e Initial load duke parents: diff changeset	1229 // We keep a running average of the amount promoted which is used
a61af66fc99e Initial load duke parents: diff changeset	1230 // to decide when we should collect the old generation (when
a61af66fc99e Initial load duke parents: diff changeset	1231 // the amount of old gen free space is less than what we expect to
a61af66fc99e Initial load duke parents: diff changeset	1232 // promote).
a61af66fc99e Initial load duke parents: diff changeset	1233
a61af66fc99e Initial load duke parents: diff changeset	1234 if (PrintAdaptiveSizePolicy) {
a61af66fc99e Initial load duke parents: diff changeset	1235 // A little more detail if Verbose is on
a61af66fc99e Initial load duke parents: diff changeset	1236 if (Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	1237 gclog_or_tty->print( " avg_survived: %f"
a61af66fc99e Initial load duke parents: diff changeset	1238 " avg_deviation: %f",
a61af66fc99e Initial load duke parents: diff changeset	1239 _avg_survived->average(),
a61af66fc99e Initial load duke parents: diff changeset	1240 _avg_survived->deviation());
a61af66fc99e Initial load duke parents: diff changeset	1241 }
a61af66fc99e Initial load duke parents: diff changeset	1242
a61af66fc99e Initial load duke parents: diff changeset	1243 gclog_or_tty->print( " avg_survived_padded_avg: %f",
a61af66fc99e Initial load duke parents: diff changeset	1244 _avg_survived->padded_average());
a61af66fc99e Initial load duke parents: diff changeset	1245
a61af66fc99e Initial load duke parents: diff changeset	1246 if (Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	1247 gclog_or_tty->print( " avg_promoted_avg: %f"
a61af66fc99e Initial load duke parents: diff changeset	1248 " avg_promoted_dev: %f",
a61af66fc99e Initial load duke parents: diff changeset	1249 avg_promoted()->average(),
a61af66fc99e Initial load duke parents: diff changeset	1250 avg_promoted()->deviation());
a61af66fc99e Initial load duke parents: diff changeset	1251 }
a61af66fc99e Initial load duke parents: diff changeset	1252
a61af66fc99e Initial load duke parents: diff changeset	1253 gclog_or_tty->print( " avg_promoted_padded_avg: %f"
a61af66fc99e Initial load duke parents: diff changeset	1254 " avg_pretenured_padded_avg: %f"
a61af66fc99e Initial load duke parents: diff changeset	1255 " tenuring_thresh: %d"
a61af66fc99e Initial load duke parents: diff changeset	1256 " target_size: " SIZE_FORMAT,
a61af66fc99e Initial load duke parents: diff changeset	1257 avg_promoted()->padded_average(),
a61af66fc99e Initial load duke parents: diff changeset	1258 _avg_pretenured->padded_average(),
a61af66fc99e Initial load duke parents: diff changeset	1259 tenuring_threshold, target_size);
a61af66fc99e Initial load duke parents: diff changeset	1260 tty->cr();
a61af66fc99e Initial load duke parents: diff changeset	1261 }
a61af66fc99e Initial load duke parents: diff changeset	1262
a61af66fc99e Initial load duke parents: diff changeset	1263 set_survivor_size(target_size);
a61af66fc99e Initial load duke parents: diff changeset	1264
a61af66fc99e Initial load duke parents: diff changeset	1265 return tenuring_threshold;
a61af66fc99e Initial load duke parents: diff changeset	1266 }
a61af66fc99e Initial load duke parents: diff changeset	1267
a61af66fc99e Initial load duke parents: diff changeset	1268 void PSAdaptiveSizePolicy::update_averages(bool is_survivor_overflow,
a61af66fc99e Initial load duke parents: diff changeset	1269 size_t survived,
a61af66fc99e Initial load duke parents: diff changeset	1270 size_t promoted) {
a61af66fc99e Initial load duke parents: diff changeset	1271 // Update averages
a61af66fc99e Initial load duke parents: diff changeset	1272 if (!is_survivor_overflow) {
a61af66fc99e Initial load duke parents: diff changeset	1273 // Keep running averages on how much survived
a61af66fc99e Initial load duke parents: diff changeset	1274 _avg_survived->sample(survived);
a61af66fc99e Initial load duke parents: diff changeset	1275 } else {
a61af66fc99e Initial load duke parents: diff changeset	1276 size_t survived_guess = survived + promoted;
a61af66fc99e Initial load duke parents: diff changeset	1277 _avg_survived->sample(survived_guess);
a61af66fc99e Initial load duke parents: diff changeset	1278 }
a61af66fc99e Initial load duke parents: diff changeset	1279 avg_promoted()->sample(promoted + _avg_pretenured->padded_average());
a61af66fc99e Initial load duke parents: diff changeset	1280
a61af66fc99e Initial load duke parents: diff changeset	1281 if (PrintAdaptiveSizePolicy) {
a61af66fc99e Initial load duke parents: diff changeset	1282 gclog_or_tty->print(
a61af66fc99e Initial load duke parents: diff changeset	1283 "AdaptiveSizePolicy::compute_survivor_space_size_and_thresh:"
a61af66fc99e Initial load duke parents: diff changeset	1284 " survived: " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	1285 " promoted: " SIZE_FORMAT
a61af66fc99e Initial load duke parents: diff changeset	1286 " overflow: %s",
a61af66fc99e Initial load duke parents: diff changeset	1287 survived, promoted, is_survivor_overflow ? "true" : "false");
a61af66fc99e Initial load duke parents: diff changeset	1288 }
a61af66fc99e Initial load duke parents: diff changeset	1289 }
a61af66fc99e Initial load duke parents: diff changeset	1290
a61af66fc99e Initial load duke parents: diff changeset	1291 bool PSAdaptiveSizePolicy::print_adaptive_size_policy_on(outputStream* st)
a61af66fc99e Initial load duke parents: diff changeset	1292 const {
a61af66fc99e Initial load duke parents: diff changeset	1293
a61af66fc99e Initial load duke parents: diff changeset	1294 if (!UseAdaptiveSizePolicy) return false;
a61af66fc99e Initial load duke parents: diff changeset	1295
a61af66fc99e Initial load duke parents: diff changeset	1296 return AdaptiveSizePolicy::print_adaptive_size_policy_on(
a61af66fc99e Initial load duke parents: diff changeset	1297 st,
a61af66fc99e Initial load duke parents: diff changeset	1298 PSScavenge::tenuring_threshold());
a61af66fc99e Initial load duke parents: diff changeset	1299 }

Mercurial > hg > truffle

annotate src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.cpp @ 10288:eba99d16dc6f