graal-compiler: src/share/vm/gc_implementation/shared/adaptiveSizePolicy.cpp annotate

annotate src/share/vm/gc_implementation/shared/adaptiveSizePolicy.cpp @ 6818:22b8d3d181d9

8000351: Tenuring threshold should be unsigned Summary: Change the flags and variables related to tenuring threshold to be unsigned Reviewed-by: jmasa, johnc

author	jwilhelm
date	Wed, 03 Oct 2012 20:31:41 +0200
parents	bca17e38de00
children	14d3f71f831d

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1387 diff changeset	2 * Copyright (c) 2004, 2010, 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/shared/adaptiveSizePolicy.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	27 #include "gc_interface/gcCause.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	28 #include "memory/collectorPolicy.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	29 #include "runtime/timer.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	30 #include "utilities/ostream.hpp"
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	31 #include "utilities/workgroup.hpp"
0 a61af66fc99e Initial load duke parents: diff changeset	32 elapsedTimer AdaptiveSizePolicy::_minor_timer;
a61af66fc99e Initial load duke parents: diff changeset	33 elapsedTimer AdaptiveSizePolicy::_major_timer;
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	34 bool AdaptiveSizePolicy::_debug_perturbation = false;
0 a61af66fc99e Initial load duke parents: diff changeset	35
a61af66fc99e Initial load duke parents: diff changeset	36 // The throughput goal is implemented as
a61af66fc99e Initial load duke parents: diff changeset	37 // _throughput_goal = 1 - ( 1 / (1 + gc_cost_ratio))
a61af66fc99e Initial load duke parents: diff changeset	38 // gc_cost_ratio is the ratio
a61af66fc99e Initial load duke parents: diff changeset	39 // application cost / gc cost
a61af66fc99e Initial load duke parents: diff changeset	40 // For example a gc_cost_ratio of 4 translates into a
a61af66fc99e Initial load duke parents: diff changeset	41 // throughput goal of .80
a61af66fc99e Initial load duke parents: diff changeset	42
a61af66fc99e Initial load duke parents: diff changeset	43 AdaptiveSizePolicy::AdaptiveSizePolicy(size_t init_eden_size,
a61af66fc99e Initial load duke parents: diff changeset	44 size_t init_promo_size,
a61af66fc99e Initial load duke parents: diff changeset	45 size_t init_survivor_size,
a61af66fc99e Initial load duke parents: diff changeset	46 double gc_pause_goal_sec,
a61af66fc99e Initial load duke parents: diff changeset	47 uint gc_cost_ratio) :
a61af66fc99e Initial load duke parents: diff changeset	48 _eden_size(init_eden_size),
a61af66fc99e Initial load duke parents: diff changeset	49 _promo_size(init_promo_size),
a61af66fc99e Initial load duke parents: diff changeset	50 _survivor_size(init_survivor_size),
a61af66fc99e Initial load duke parents: diff changeset	51 _gc_pause_goal_sec(gc_pause_goal_sec),
a61af66fc99e Initial load duke parents: diff changeset	52 _throughput_goal(1.0 - double(1.0 / (1.0 + (double) gc_cost_ratio))),
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	53 _gc_overhead_limit_exceeded(false),
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	54 _print_gc_overhead_limit_would_be_exceeded(false),
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	55 _gc_overhead_limit_count(0),
0 a61af66fc99e Initial load duke parents: diff changeset	56 _latest_minor_mutator_interval_seconds(0),
a61af66fc99e Initial load duke parents: diff changeset	57 _threshold_tolerance_percent(1.0 + ThresholdTolerance/100.0),
a61af66fc99e Initial load duke parents: diff changeset	58 _young_gen_change_for_minor_throughput(0),
a61af66fc99e Initial load duke parents: diff changeset	59 _old_gen_change_for_major_throughput(0) {
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	60 assert(AdaptiveSizePolicyGCTimeLimitThreshold > 0,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	61 "No opportunity to clear SoftReferences before GC overhead limit");
0 a61af66fc99e Initial load duke parents: diff changeset	62 _avg_minor_pause =
a61af66fc99e Initial load duke parents: diff changeset	63 new AdaptivePaddedAverage(AdaptiveTimeWeight, PausePadding);
a61af66fc99e Initial load duke parents: diff changeset	64 _avg_minor_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
a61af66fc99e Initial load duke parents: diff changeset	65 _avg_minor_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
a61af66fc99e Initial load duke parents: diff changeset	66 _avg_major_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
a61af66fc99e Initial load duke parents: diff changeset	67
a61af66fc99e Initial load duke parents: diff changeset	68 _avg_young_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight);
a61af66fc99e Initial load duke parents: diff changeset	69 _avg_old_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight);
a61af66fc99e Initial load duke parents: diff changeset	70 _avg_eden_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight);
a61af66fc99e Initial load duke parents: diff changeset	71
a61af66fc99e Initial load duke parents: diff changeset	72 _avg_survived = new AdaptivePaddedAverage(AdaptiveSizePolicyWeight,
a61af66fc99e Initial load duke parents: diff changeset	73 SurvivorPadding);
a61af66fc99e Initial load duke parents: diff changeset	74 _avg_pretenured = new AdaptivePaddedNoZeroDevAverage(
a61af66fc99e Initial load duke parents: diff changeset	75 AdaptiveSizePolicyWeight,
a61af66fc99e Initial load duke parents: diff changeset	76 SurvivorPadding);
a61af66fc99e Initial load duke parents: diff changeset	77
a61af66fc99e Initial load duke parents: diff changeset	78 _minor_pause_old_estimator =
a61af66fc99e Initial load duke parents: diff changeset	79 new LinearLeastSquareFit(AdaptiveSizePolicyWeight);
a61af66fc99e Initial load duke parents: diff changeset	80 _minor_pause_young_estimator =
a61af66fc99e Initial load duke parents: diff changeset	81 new LinearLeastSquareFit(AdaptiveSizePolicyWeight);
a61af66fc99e Initial load duke parents: diff changeset	82 _minor_collection_estimator =
a61af66fc99e Initial load duke parents: diff changeset	83 new LinearLeastSquareFit(AdaptiveSizePolicyWeight);
a61af66fc99e Initial load duke parents: diff changeset	84 _major_collection_estimator =
a61af66fc99e Initial load duke parents: diff changeset	85 new LinearLeastSquareFit(AdaptiveSizePolicyWeight);
a61af66fc99e Initial load duke parents: diff changeset	86
a61af66fc99e Initial load duke parents: diff changeset	87 // Start the timers
a61af66fc99e Initial load duke parents: diff changeset	88 _minor_timer.start();
a61af66fc99e Initial load duke parents: diff changeset	89
a61af66fc99e Initial load duke parents: diff changeset	90 _young_gen_policy_is_ready = false;
a61af66fc99e Initial load duke parents: diff changeset	91 }
a61af66fc99e Initial load duke parents: diff changeset	92
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	93 // If the number of GC threads was set on the command line,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	94 // use it.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	95 // Else
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	96 // Calculate the number of GC threads based on the number of Java threads.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	97 // Calculate the number of GC threads based on the size of the heap.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	98 // Use the larger.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	99
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	100 int AdaptiveSizePolicy::calc_default_active_workers(uintx total_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	101 const uintx min_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	102 uintx active_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	103 uintx application_workers) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	104 // If the user has specifically set the number of
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	105 // GC threads, use them.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	106
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	107 // If the user has turned off using a dynamic number of GC threads
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	108 // or the users has requested a specific number, set the active
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	109 // number of workers to all the workers.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	110
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	111 uintx new_active_workers = total_workers;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	112 uintx prev_active_workers = active_workers;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	113 uintx active_workers_by_JT = 0;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	114 uintx active_workers_by_heap_size = 0;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	115
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	116 // Always use at least min_workers but use up to
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	117 // GCThreadsPerJavaThreads * application threads.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	118 active_workers_by_JT =
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	119 MAX2((uintx) GCWorkersPerJavaThread * application_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	120 min_workers);
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	121
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	122 // Choose a number of GC threads based on the current size
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	123 // of the heap. This may be complicated because the size of
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	124 // the heap depends on factors such as the thoughput goal.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	125 // Still a large heap should be collected by more GC threads.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	126 active_workers_by_heap_size =
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	127 MAX2((size_t) 2U, Universe::heap()->capacity() / HeapSizePerGCThread);
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	128
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	129 uintx max_active_workers =
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	130 MAX2(active_workers_by_JT, active_workers_by_heap_size);
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	131
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	132 // Limit the number of workers to the the number created,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	133 // (workers()).
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	134 new_active_workers = MIN2(max_active_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	135 (uintx) total_workers);
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	136
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	137 // Increase GC workers instantly but decrease them more
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	138 // slowly.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	139 if (new_active_workers < prev_active_workers) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	140 new_active_workers =
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	141 MAX2(min_workers, (prev_active_workers + new_active_workers) / 2);
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	142 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	143
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	144 // Check once more that the number of workers is within the limits.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	145 assert(min_workers <= total_workers, "Minimum workers not consistent with total workers");
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	146 assert(new_active_workers >= min_workers, "Minimum workers not observed");
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	147 assert(new_active_workers <= total_workers, "Total workers not observed");
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	148
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	149 if (ForceDynamicNumberOfGCThreads) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	150 // Assume this is debugging and jiggle the number of GC threads.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	151 if (new_active_workers == prev_active_workers) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	152 if (new_active_workers < total_workers) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	153 new_active_workers++;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	154 } else if (new_active_workers > min_workers) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	155 new_active_workers--;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	156 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	157 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	158 if (new_active_workers == total_workers) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	159 if (_debug_perturbation) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	160 new_active_workers = min_workers;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	161 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	162 _debug_perturbation = !_debug_perturbation;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	163 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	164 assert((new_active_workers <= (uintx) ParallelGCThreads) &&
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	165 (new_active_workers >= min_workers),
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	166 "Jiggled active workers too much");
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	167 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	168
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	169 if (TraceDynamicGCThreads) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	170 gclog_or_tty->print_cr("GCTaskManager::calc_default_active_workers() : "
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	171 "active_workers(): %d new_acitve_workers: %d "
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	172 "prev_active_workers: %d\n"
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	173 " active_workers_by_JT: %d active_workers_by_heap_size: %d",
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	174 active_workers, new_active_workers, prev_active_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	175 active_workers_by_JT, active_workers_by_heap_size);
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	176 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	177 assert(new_active_workers > 0, "Always need at least 1");
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	178 return new_active_workers;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	179 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	180
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	181 int AdaptiveSizePolicy::calc_active_workers(uintx total_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	182 uintx active_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	183 uintx application_workers) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	184 // If the user has specifically set the number of
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	185 // GC threads, use them.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	186
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	187 // If the user has turned off using a dynamic number of GC threads
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	188 // or the users has requested a specific number, set the active
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	189 // number of workers to all the workers.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	190
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	191 int new_active_workers;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	192 if (!UseDynamicNumberOfGCThreads \|\|
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	193 (!FLAG_IS_DEFAULT(ParallelGCThreads) && !ForceDynamicNumberOfGCThreads)) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	194 new_active_workers = total_workers;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	195 } else {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	196 new_active_workers = calc_default_active_workers(total_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	197 2, /* Minimum number of workers */
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	198 active_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	199 application_workers);
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	200 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	201 assert(new_active_workers > 0, "Always need at least 1");
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	202 return new_active_workers;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	203 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	204
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	205 int AdaptiveSizePolicy::calc_active_conc_workers(uintx total_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	206 uintx active_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	207 uintx application_workers) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	208 if (!UseDynamicNumberOfGCThreads \|\|
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	209 (!FLAG_IS_DEFAULT(ConcGCThreads) && !ForceDynamicNumberOfGCThreads)) {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	210 return ConcGCThreads;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	211 } else {
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	212 int no_of_gc_threads = calc_default_active_workers(
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	213 total_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	214 1, /* Minimum number of workers */
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	215 active_workers,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	216 application_workers);
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	217 return no_of_gc_threads;
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	218 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	219 }
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 1972 diff changeset	220
0 a61af66fc99e Initial load duke parents: diff changeset	221 bool AdaptiveSizePolicy::tenuring_threshold_change() const {
a61af66fc99e Initial load duke parents: diff changeset	222 return decrement_tenuring_threshold_for_gc_cost() \|\|
a61af66fc99e Initial load duke parents: diff changeset	223 increment_tenuring_threshold_for_gc_cost() \|\|
a61af66fc99e Initial load duke parents: diff changeset	224 decrement_tenuring_threshold_for_survivor_limit();
a61af66fc99e Initial load duke parents: diff changeset	225 }
a61af66fc99e Initial load duke parents: diff changeset	226
a61af66fc99e Initial load duke parents: diff changeset	227 void AdaptiveSizePolicy::minor_collection_begin() {
a61af66fc99e Initial load duke parents: diff changeset	228 // Update the interval time
a61af66fc99e Initial load duke parents: diff changeset	229 _minor_timer.stop();
a61af66fc99e Initial load duke parents: diff changeset	230 // Save most recent collection time
a61af66fc99e Initial load duke parents: diff changeset	231 _latest_minor_mutator_interval_seconds = _minor_timer.seconds();
a61af66fc99e Initial load duke parents: diff changeset	232 _minor_timer.reset();
a61af66fc99e Initial load duke parents: diff changeset	233 _minor_timer.start();
a61af66fc99e Initial load duke parents: diff changeset	234 }
a61af66fc99e Initial load duke parents: diff changeset	235
a61af66fc99e Initial load duke parents: diff changeset	236 void AdaptiveSizePolicy::update_minor_pause_young_estimator(
a61af66fc99e Initial load duke parents: diff changeset	237 double minor_pause_in_ms) {
a61af66fc99e Initial load duke parents: diff changeset	238 double eden_size_in_mbytes = ((double)_eden_size)/((double)M);
a61af66fc99e Initial load duke parents: diff changeset	239 _minor_pause_young_estimator->update(eden_size_in_mbytes,
a61af66fc99e Initial load duke parents: diff changeset	240 minor_pause_in_ms);
a61af66fc99e Initial load duke parents: diff changeset	241 }
a61af66fc99e Initial load duke parents: diff changeset	242
a61af66fc99e Initial load duke parents: diff changeset	243 void AdaptiveSizePolicy::minor_collection_end(GCCause::Cause gc_cause) {
a61af66fc99e Initial load duke parents: diff changeset	244 // Update the pause time.
a61af66fc99e Initial load duke parents: diff changeset	245 _minor_timer.stop();
a61af66fc99e Initial load duke parents: diff changeset	246
a61af66fc99e Initial load duke parents: diff changeset	247 if (gc_cause != GCCause::_java_lang_system_gc \|\|
a61af66fc99e Initial load duke parents: diff changeset	248 UseAdaptiveSizePolicyWithSystemGC) {
a61af66fc99e Initial load duke parents: diff changeset	249 double minor_pause_in_seconds = _minor_timer.seconds();
a61af66fc99e Initial load duke parents: diff changeset	250 double minor_pause_in_ms = minor_pause_in_seconds * MILLIUNITS;
a61af66fc99e Initial load duke parents: diff changeset	251
a61af66fc99e Initial load duke parents: diff changeset	252 // Sample for performance counter
a61af66fc99e Initial load duke parents: diff changeset	253 _avg_minor_pause->sample(minor_pause_in_seconds);
a61af66fc99e Initial load duke parents: diff changeset	254
a61af66fc99e Initial load duke parents: diff changeset	255 // Cost of collection (unit-less)
a61af66fc99e Initial load duke parents: diff changeset	256 double collection_cost = 0.0;
a61af66fc99e Initial load duke parents: diff changeset	257 if ((_latest_minor_mutator_interval_seconds > 0.0) &&
a61af66fc99e Initial load duke parents: diff changeset	258 (minor_pause_in_seconds > 0.0)) {
a61af66fc99e Initial load duke parents: diff changeset	259 double interval_in_seconds =
a61af66fc99e Initial load duke parents: diff changeset	260 _latest_minor_mutator_interval_seconds + minor_pause_in_seconds;
a61af66fc99e Initial load duke parents: diff changeset	261 collection_cost =
a61af66fc99e Initial load duke parents: diff changeset	262 minor_pause_in_seconds / interval_in_seconds;
a61af66fc99e Initial load duke parents: diff changeset	263 _avg_minor_gc_cost->sample(collection_cost);
a61af66fc99e Initial load duke parents: diff changeset	264 // Sample for performance counter
a61af66fc99e Initial load duke parents: diff changeset	265 _avg_minor_interval->sample(interval_in_seconds);
a61af66fc99e Initial load duke parents: diff changeset	266 }
a61af66fc99e Initial load duke parents: diff changeset	267
a61af66fc99e Initial load duke parents: diff changeset	268 // The policy does not have enough data until at least some
a61af66fc99e Initial load duke parents: diff changeset	269 // minor collections have been done.
a61af66fc99e Initial load duke parents: diff changeset	270 _young_gen_policy_is_ready =
a61af66fc99e Initial load duke parents: diff changeset	271 (_avg_minor_gc_cost->count() >= AdaptiveSizePolicyReadyThreshold);
a61af66fc99e Initial load duke parents: diff changeset	272
a61af66fc99e Initial load duke parents: diff changeset	273 // Calculate variables used to estimate pause time vs. gen sizes
a61af66fc99e Initial load duke parents: diff changeset	274 double eden_size_in_mbytes = ((double)_eden_size)/((double)M);
a61af66fc99e Initial load duke parents: diff changeset	275 update_minor_pause_young_estimator(minor_pause_in_ms);
a61af66fc99e Initial load duke parents: diff changeset	276 update_minor_pause_old_estimator(minor_pause_in_ms);
a61af66fc99e Initial load duke parents: diff changeset	277
a61af66fc99e Initial load duke parents: diff changeset	278 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	279 gclog_or_tty->print("AdaptiveSizePolicy::minor_collection_end: "
a61af66fc99e Initial load duke parents: diff changeset	280 "minor gc cost: %f average: %f", collection_cost,
a61af66fc99e Initial load duke parents: diff changeset	281 _avg_minor_gc_cost->average());
a61af66fc99e Initial load duke parents: diff changeset	282 gclog_or_tty->print_cr(" minor pause: %f minor period %f",
a61af66fc99e Initial load duke parents: diff changeset	283 minor_pause_in_ms,
a61af66fc99e Initial load duke parents: diff changeset	284 _latest_minor_mutator_interval_seconds * MILLIUNITS);
a61af66fc99e Initial load duke parents: diff changeset	285 }
a61af66fc99e Initial load duke parents: diff changeset	286
a61af66fc99e Initial load duke parents: diff changeset	287 // Calculate variable used to estimate collection cost vs. gen sizes
a61af66fc99e Initial load duke parents: diff changeset	288 assert(collection_cost >= 0.0, "Expected to be non-negative");
a61af66fc99e Initial load duke parents: diff changeset	289 _minor_collection_estimator->update(eden_size_in_mbytes, collection_cost);
a61af66fc99e Initial load duke parents: diff changeset	290 }
a61af66fc99e Initial load duke parents: diff changeset	291
a61af66fc99e Initial load duke parents: diff changeset	292 // Interval times use this timer to measure the mutator time.
a61af66fc99e Initial load duke parents: diff changeset	293 // Reset the timer after the GC pause.
a61af66fc99e Initial load duke parents: diff changeset	294 _minor_timer.reset();
a61af66fc99e Initial load duke parents: diff changeset	295 _minor_timer.start();
a61af66fc99e Initial load duke parents: diff changeset	296 }
a61af66fc99e Initial load duke parents: diff changeset	297
a61af66fc99e Initial load duke parents: diff changeset	298 size_t AdaptiveSizePolicy::eden_increment(size_t cur_eden,
a61af66fc99e Initial load duke parents: diff changeset	299 uint percent_change) {
a61af66fc99e Initial load duke parents: diff changeset	300 size_t eden_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	301 eden_heap_delta = cur_eden / 100 * percent_change;
a61af66fc99e Initial load duke parents: diff changeset	302 return eden_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	303 }
a61af66fc99e Initial load duke parents: diff changeset	304
a61af66fc99e Initial load duke parents: diff changeset	305 size_t AdaptiveSizePolicy::eden_increment(size_t cur_eden) {
a61af66fc99e Initial load duke parents: diff changeset	306 return eden_increment(cur_eden, YoungGenerationSizeIncrement);
a61af66fc99e Initial load duke parents: diff changeset	307 }
a61af66fc99e Initial load duke parents: diff changeset	308
a61af66fc99e Initial load duke parents: diff changeset	309 size_t AdaptiveSizePolicy::eden_decrement(size_t cur_eden) {
a61af66fc99e Initial load duke parents: diff changeset	310 size_t eden_heap_delta = eden_increment(cur_eden) /
a61af66fc99e Initial load duke parents: diff changeset	311 AdaptiveSizeDecrementScaleFactor;
a61af66fc99e Initial load duke parents: diff changeset	312 return eden_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	313 }
a61af66fc99e Initial load duke parents: diff changeset	314
a61af66fc99e Initial load duke parents: diff changeset	315 size_t AdaptiveSizePolicy::promo_increment(size_t cur_promo,
a61af66fc99e Initial load duke parents: diff changeset	316 uint percent_change) {
a61af66fc99e Initial load duke parents: diff changeset	317 size_t promo_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	318 promo_heap_delta = cur_promo / 100 * percent_change;
a61af66fc99e Initial load duke parents: diff changeset	319 return promo_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	320 }
a61af66fc99e Initial load duke parents: diff changeset	321
a61af66fc99e Initial load duke parents: diff changeset	322 size_t AdaptiveSizePolicy::promo_increment(size_t cur_promo) {
a61af66fc99e Initial load duke parents: diff changeset	323 return promo_increment(cur_promo, TenuredGenerationSizeIncrement);
a61af66fc99e Initial load duke parents: diff changeset	324 }
a61af66fc99e Initial load duke parents: diff changeset	325
a61af66fc99e Initial load duke parents: diff changeset	326 size_t AdaptiveSizePolicy::promo_decrement(size_t cur_promo) {
a61af66fc99e Initial load duke parents: diff changeset	327 size_t promo_heap_delta = promo_increment(cur_promo);
a61af66fc99e Initial load duke parents: diff changeset	328 promo_heap_delta = promo_heap_delta / AdaptiveSizeDecrementScaleFactor;
a61af66fc99e Initial load duke parents: diff changeset	329 return promo_heap_delta;
a61af66fc99e Initial load duke parents: diff changeset	330 }
a61af66fc99e Initial load duke parents: diff changeset	331
a61af66fc99e Initial load duke parents: diff changeset	332 double AdaptiveSizePolicy::time_since_major_gc() const {
a61af66fc99e Initial load duke parents: diff changeset	333 _major_timer.stop();
a61af66fc99e Initial load duke parents: diff changeset	334 double result = _major_timer.seconds();
a61af66fc99e Initial load duke parents: diff changeset	335 _major_timer.start();
a61af66fc99e Initial load duke parents: diff changeset	336 return result;
a61af66fc99e Initial load duke parents: diff changeset	337 }
a61af66fc99e Initial load duke parents: diff changeset	338
a61af66fc99e Initial load duke parents: diff changeset	339 // Linear decay of major gc cost
a61af66fc99e Initial load duke parents: diff changeset	340 double AdaptiveSizePolicy::decaying_major_gc_cost() const {
a61af66fc99e Initial load duke parents: diff changeset	341 double major_interval = major_gc_interval_average_for_decay();
a61af66fc99e Initial load duke parents: diff changeset	342 double major_gc_cost_average = major_gc_cost();
a61af66fc99e Initial load duke parents: diff changeset	343 double decayed_major_gc_cost = major_gc_cost_average;
a61af66fc99e Initial load duke parents: diff changeset	344 if(time_since_major_gc() > 0.0) {
a61af66fc99e Initial load duke parents: diff changeset	345 decayed_major_gc_cost = major_gc_cost() *
a61af66fc99e Initial load duke parents: diff changeset	346 (((double) AdaptiveSizeMajorGCDecayTimeScale) * major_interval)
a61af66fc99e Initial load duke parents: diff changeset	347 / time_since_major_gc();
a61af66fc99e Initial load duke parents: diff changeset	348 }
a61af66fc99e Initial load duke parents: diff changeset	349
a61af66fc99e Initial load duke parents: diff changeset	350 // The decayed cost should always be smaller than the
a61af66fc99e Initial load duke parents: diff changeset	351 // average cost but the vagaries of finite arithmetic could
a61af66fc99e Initial load duke parents: diff changeset	352 // produce a larger value in decayed_major_gc_cost so protect
a61af66fc99e Initial load duke parents: diff changeset	353 // against that.
a61af66fc99e Initial load duke parents: diff changeset	354 return MIN2(major_gc_cost_average, decayed_major_gc_cost);
a61af66fc99e Initial load duke parents: diff changeset	355 }
a61af66fc99e Initial load duke parents: diff changeset	356
a61af66fc99e Initial load duke parents: diff changeset	357 // Use a value of the major gc cost that has been decayed
a61af66fc99e Initial load duke parents: diff changeset	358 // by the factor
a61af66fc99e Initial load duke parents: diff changeset	359 //
a61af66fc99e Initial load duke parents: diff changeset	360 // average-interval-between-major-gc * AdaptiveSizeMajorGCDecayTimeScale /
a61af66fc99e Initial load duke parents: diff changeset	361 // time-since-last-major-gc
a61af66fc99e Initial load duke parents: diff changeset	362 //
a61af66fc99e Initial load duke parents: diff changeset	363 // if the average-interval-between-major-gc * AdaptiveSizeMajorGCDecayTimeScale
a61af66fc99e Initial load duke parents: diff changeset	364 // is less than time-since-last-major-gc.
a61af66fc99e Initial load duke parents: diff changeset	365 //
a61af66fc99e Initial load duke parents: diff changeset	366 // In cases where there are initial major gc's that
a61af66fc99e Initial load duke parents: diff changeset	367 // are of a relatively high cost but no later major
a61af66fc99e Initial load duke parents: diff changeset	368 // gc's, the total gc cost can remain high because
a61af66fc99e Initial load duke parents: diff changeset	369 // the major gc cost remains unchanged (since there are no major
a61af66fc99e Initial load duke parents: diff changeset	370 // gc's). In such a situation the value of the unchanging
a61af66fc99e Initial load duke parents: diff changeset	371 // major gc cost can keep the mutator throughput below
a61af66fc99e Initial load duke parents: diff changeset	372 // the goal when in fact the major gc cost is becoming diminishingly
a61af66fc99e Initial load duke parents: diff changeset	373 // small. Use the decaying gc cost only to decide whether to
a61af66fc99e Initial load duke parents: diff changeset	374 // adjust for throughput. Using it also to determine the adjustment
a61af66fc99e Initial load duke parents: diff changeset	375 // to be made for throughput also seems reasonable but there is
a61af66fc99e Initial load duke parents: diff changeset	376 // no test case to use to decide if it is the right thing to do
a61af66fc99e Initial load duke parents: diff changeset	377 // don't do it yet.
a61af66fc99e Initial load duke parents: diff changeset	378
a61af66fc99e Initial load duke parents: diff changeset	379 double AdaptiveSizePolicy::decaying_gc_cost() const {
a61af66fc99e Initial load duke parents: diff changeset	380 double decayed_major_gc_cost = major_gc_cost();
a61af66fc99e Initial load duke parents: diff changeset	381 double avg_major_interval = major_gc_interval_average_for_decay();
a61af66fc99e Initial load duke parents: diff changeset	382 if (UseAdaptiveSizeDecayMajorGCCost &&
a61af66fc99e Initial load duke parents: diff changeset	383 (AdaptiveSizeMajorGCDecayTimeScale > 0) &&
a61af66fc99e Initial load duke parents: diff changeset	384 (avg_major_interval > 0.00)) {
a61af66fc99e Initial load duke parents: diff changeset	385 double time_since_last_major_gc = time_since_major_gc();
a61af66fc99e Initial load duke parents: diff changeset	386
a61af66fc99e Initial load duke parents: diff changeset	387 // Decay the major gc cost?
a61af66fc99e Initial load duke parents: diff changeset	388 if (time_since_last_major_gc >
a61af66fc99e Initial load duke parents: diff changeset	389 ((double) AdaptiveSizeMajorGCDecayTimeScale) * avg_major_interval) {
a61af66fc99e Initial load duke parents: diff changeset	390
a61af66fc99e Initial load duke parents: diff changeset	391 // Decay using the time-since-last-major-gc
a61af66fc99e Initial load duke parents: diff changeset	392 decayed_major_gc_cost = decaying_major_gc_cost();
a61af66fc99e Initial load duke parents: diff changeset	393 if (PrintGCDetails && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	394 gclog_or_tty->print_cr("\ndecaying_gc_cost: major interval average:"
a61af66fc99e Initial load duke parents: diff changeset	395 " %f time since last major gc: %f",
a61af66fc99e Initial load duke parents: diff changeset	396 avg_major_interval, time_since_last_major_gc);
a61af66fc99e Initial load duke parents: diff changeset	397 gclog_or_tty->print_cr(" major gc cost: %f decayed major gc cost: %f",
a61af66fc99e Initial load duke parents: diff changeset	398 major_gc_cost(), decayed_major_gc_cost);
a61af66fc99e Initial load duke parents: diff changeset	399 }
a61af66fc99e Initial load duke parents: diff changeset	400 }
a61af66fc99e Initial load duke parents: diff changeset	401 }
a61af66fc99e Initial load duke parents: diff changeset	402 double result = MIN2(1.0, decayed_major_gc_cost + minor_gc_cost());
a61af66fc99e Initial load duke parents: diff changeset	403 return result;
a61af66fc99e Initial load duke parents: diff changeset	404 }
a61af66fc99e Initial load duke parents: diff changeset	405
a61af66fc99e Initial load duke parents: diff changeset	406
a61af66fc99e Initial load duke parents: diff changeset	407 void AdaptiveSizePolicy::clear_generation_free_space_flags() {
a61af66fc99e Initial load duke parents: diff changeset	408 set_change_young_gen_for_min_pauses(0);
a61af66fc99e Initial load duke parents: diff changeset	409 set_change_old_gen_for_maj_pauses(0);
a61af66fc99e Initial load duke parents: diff changeset	410
a61af66fc99e Initial load duke parents: diff changeset	411 set_change_old_gen_for_throughput(0);
a61af66fc99e Initial load duke parents: diff changeset	412 set_change_young_gen_for_throughput(0);
a61af66fc99e Initial load duke parents: diff changeset	413 set_decrease_for_footprint(0);
a61af66fc99e Initial load duke parents: diff changeset	414 set_decide_at_full_gc(0);
a61af66fc99e Initial load duke parents: diff changeset	415 }
a61af66fc99e Initial load duke parents: diff changeset	416
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	417 void AdaptiveSizePolicy::check_gc_overhead_limit(
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	418 size_t young_live,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	419 size_t eden_live,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	420 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	421 size_t max_eden_size,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	422 bool is_full_gc,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	423 GCCause::Cause gc_cause,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	424 CollectorPolicy* collector_policy) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	425
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	426 // Ignore explicit GC's. Exiting here does not set the flag and
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	427 // does not reset the count. Updating of the averages for system
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	428 // GC's is still controlled by UseAdaptiveSizePolicyWithSystemGC.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	429 if (GCCause::is_user_requested_gc(gc_cause) \|\|
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	430 GCCause::is_serviceability_requested_gc(gc_cause)) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	431 return;
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	432 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	433 // eden_limit is the upper limit on the size of eden based on
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	434 // the maximum size of the young generation and the sizes
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	435 // of the survivor space.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	436 // The question being asked is whether the gc costs are high
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	437 // and the space being recovered by a collection is low.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	438 // free_in_young_gen is the free space in the young generation
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	439 // after a collection and promo_live is the free space in the old
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	440 // generation after a collection.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	441 //
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	442 // Use the minimum of the current value of the live in the
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	443 // young gen or the average of the live in the young gen.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	444 // If the current value drops quickly, that should be taken
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	445 // into account (i.e., don't trigger if the amount of free
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	446 // space has suddenly jumped up). If the current is much
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	447 // higher than the average, use the average since it represents
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	448 // the longer term behavor.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	449 const size_t live_in_eden =
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	450 MIN2(eden_live, (size_t) avg_eden_live()->average());
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	451 const size_t free_in_eden = max_eden_size > live_in_eden ?
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	452 max_eden_size - live_in_eden : 0;
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	453 const size_t free_in_old_gen = (size_t)(max_old_gen_size - avg_old_live()->average());
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	454 const size_t total_free_limit = free_in_old_gen + free_in_eden;
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	455 const size_t total_mem = max_old_gen_size + max_eden_size;
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	456 const double mem_free_limit = total_mem * (GCHeapFreeLimit/100.0);
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	457 const double mem_free_old_limit = max_old_gen_size * (GCHeapFreeLimit/100.0);
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	458 const double mem_free_eden_limit = max_eden_size * (GCHeapFreeLimit/100.0);
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	459 const double gc_cost_limit = GCTimeLimit/100.0;
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	460 size_t promo_limit = (size_t)(max_old_gen_size - avg_old_live()->average());
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	461 // But don't force a promo size below the current promo size. Otherwise,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	462 // the promo size will shrink for no good reason.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	463 promo_limit = MAX2(promo_limit, _promo_size);
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	464
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	465
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	466 if (PrintAdaptiveSizePolicy && (Verbose \|\|
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	467 (free_in_old_gen < (size_t) mem_free_old_limit &&
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	468 free_in_eden < (size_t) mem_free_eden_limit))) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	469 gclog_or_tty->print_cr(
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	470 "PSAdaptiveSizePolicy::compute_generation_free_space limits:"
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	471 " promo_limit: " SIZE_FORMAT
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	472 " max_eden_size: " SIZE_FORMAT
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	473 " total_free_limit: " SIZE_FORMAT
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	474 " max_old_gen_size: " SIZE_FORMAT
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	475 " max_eden_size: " SIZE_FORMAT
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	476 " mem_free_limit: " SIZE_FORMAT,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	477 promo_limit, max_eden_size, total_free_limit,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	478 max_old_gen_size, max_eden_size,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	479 (size_t) mem_free_limit);
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	480 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	481
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	482 bool print_gc_overhead_limit_would_be_exceeded = false;
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	483 if (is_full_gc) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	484 if (gc_cost() > gc_cost_limit &&
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	485 free_in_old_gen < (size_t) mem_free_old_limit &&
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	486 free_in_eden < (size_t) mem_free_eden_limit) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	487 // Collections, on average, are taking too much time, and
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	488 // gc_cost() > gc_cost_limit
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	489 // we have too little space available after a full gc.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	490 // total_free_limit < mem_free_limit
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	491 // where
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	492 // total_free_limit is the free space available in
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	493 // both generations
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	494 // total_mem is the total space available for allocation
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	495 // in both generations (survivor spaces are not included
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	496 // just as they are not included in eden_limit).
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	497 // mem_free_limit is a fraction of total_mem judged to be an
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	498 // acceptable amount that is still unused.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	499 // The heap can ask for the value of this variable when deciding
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	500 // whether to thrown an OutOfMemory error.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	501 // Note that the gc time limit test only works for the collections
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	502 // of the young gen + tenured gen and not for collections of the
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	503 // permanent gen. That is because the calculation of the space
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	504 // freed by the collection is the free space in the young gen +
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	505 // tenured gen.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	506 // At this point the GC overhead limit is being exceeded.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	507 inc_gc_overhead_limit_count();
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	508 if (UseGCOverheadLimit) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	509 if (gc_overhead_limit_count() >=
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	510 AdaptiveSizePolicyGCTimeLimitThreshold){
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	511 // All conditions have been met for throwing an out-of-memory
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	512 set_gc_overhead_limit_exceeded(true);
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	513 // Avoid consecutive OOM due to the gc time limit by resetting
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	514 // the counter.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	515 reset_gc_overhead_limit_count();
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	516 } else {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	517 // The required consecutive collections which exceed the
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	518 // GC time limit may or may not have been reached. We
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	519 // are approaching that condition and so as not to
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	520 // throw an out-of-memory before all SoftRef's have been
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	521 // cleared, set _should_clear_all_soft_refs in CollectorPolicy.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	522 // The clearing will be done on the next GC.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	523 bool near_limit = gc_overhead_limit_near();
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	524 if (near_limit) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	525 collector_policy->set_should_clear_all_soft_refs(true);
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	526 if (PrintGCDetails && Verbose) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	527 gclog_or_tty->print_cr(" Nearing GC overhead limit, "
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	528 "will be clearing all SoftReference");
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	529 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	530 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	531 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	532 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	533 // Set this even when the overhead limit will not
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	534 // cause an out-of-memory. Diagnostic message indicating
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	535 // that the overhead limit is being exceeded is sometimes
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	536 // printed.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	537 print_gc_overhead_limit_would_be_exceeded = true;
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	538
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	539 } else {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	540 // Did not exceed overhead limits
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	541 reset_gc_overhead_limit_count();
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	542 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	543 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	544
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	545 if (UseGCOverheadLimit && PrintGCDetails && Verbose) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	546 if (gc_overhead_limit_exceeded()) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	547 gclog_or_tty->print_cr(" GC is exceeding overhead limit "
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	548 "of %d%%", GCTimeLimit);
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	549 reset_gc_overhead_limit_count();
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	550 } else if (print_gc_overhead_limit_would_be_exceeded) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	551 assert(gc_overhead_limit_count() > 0, "Should not be printing");
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	552 gclog_or_tty->print_cr(" GC would exceed overhead limit "
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	553 "of %d%% %d consecutive time(s)",
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	554 GCTimeLimit, gc_overhead_limit_count());
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	555 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	556 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 0 diff changeset	557 }
0 a61af66fc99e Initial load duke parents: diff changeset	558 // Printing
a61af66fc99e Initial load duke parents: diff changeset	559
a61af66fc99e Initial load duke parents: diff changeset	560 bool AdaptiveSizePolicy::print_adaptive_size_policy_on(outputStream* st) const {
a61af66fc99e Initial load duke parents: diff changeset	561
a61af66fc99e Initial load duke parents: diff changeset	562 // Should only be used with adaptive size policy turned on.
a61af66fc99e Initial load duke parents: diff changeset	563 // Otherwise, there may be variables that are undefined.
a61af66fc99e Initial load duke parents: diff changeset	564 if (!UseAdaptiveSizePolicy) return false;
a61af66fc99e Initial load duke parents: diff changeset	565
a61af66fc99e Initial load duke parents: diff changeset	566 // Print goal for which action is needed.
a61af66fc99e Initial load duke parents: diff changeset	567 char* action = NULL;
a61af66fc99e Initial load duke parents: diff changeset	568 bool change_for_pause = false;
a61af66fc99e Initial load duke parents: diff changeset	569 if ((change_old_gen_for_maj_pauses() ==
a61af66fc99e Initial load duke parents: diff changeset	570 decrease_old_gen_for_maj_pauses_true) \|\|
a61af66fc99e Initial load duke parents: diff changeset	571 (change_young_gen_for_min_pauses() ==
a61af66fc99e Initial load duke parents: diff changeset	572 decrease_young_gen_for_min_pauses_true)) {
a61af66fc99e Initial load duke parents: diff changeset	573 action = (char) " pause time goal *";
a61af66fc99e Initial load duke parents: diff changeset	574 change_for_pause = true;
a61af66fc99e Initial load duke parents: diff changeset	575 } else if ((change_old_gen_for_throughput() ==
a61af66fc99e Initial load duke parents: diff changeset	576 increase_old_gen_for_throughput_true) \|\|
a61af66fc99e Initial load duke parents: diff changeset	577 (change_young_gen_for_throughput() ==
a61af66fc99e Initial load duke parents: diff changeset	578 increase_young_gen_for_througput_true)) {
a61af66fc99e Initial load duke parents: diff changeset	579 action = (char) " throughput goal *";
a61af66fc99e Initial load duke parents: diff changeset	580 } else if (decrease_for_footprint()) {
a61af66fc99e Initial load duke parents: diff changeset	581 action = (char) " reduced footprint *";
a61af66fc99e Initial load duke parents: diff changeset	582 } else {
a61af66fc99e Initial load duke parents: diff changeset	583 // No actions were taken. This can legitimately be the
a61af66fc99e Initial load duke parents: diff changeset	584 // situation if not enough data has been gathered to make
a61af66fc99e Initial load duke parents: diff changeset	585 // decisions.
a61af66fc99e Initial load duke parents: diff changeset	586 return false;
a61af66fc99e Initial load duke parents: diff changeset	587 }
a61af66fc99e Initial load duke parents: diff changeset	588
a61af66fc99e Initial load duke parents: diff changeset	589 // Pauses
a61af66fc99e Initial load duke parents: diff changeset	590 // Currently the size of the old gen is only adjusted to
a61af66fc99e Initial load duke parents: diff changeset	591 // change the major pause times.
a61af66fc99e Initial load duke parents: diff changeset	592 char* young_gen_action = NULL;
a61af66fc99e Initial load duke parents: diff changeset	593 char* tenured_gen_action = NULL;
a61af66fc99e Initial load duke parents: diff changeset	594
a61af66fc99e Initial load duke parents: diff changeset	595 char* shrink_msg = (char*) "(attempted to shrink)";
a61af66fc99e Initial load duke parents: diff changeset	596 char* grow_msg = (char*) "(attempted to grow)";
a61af66fc99e Initial load duke parents: diff changeset	597 char* no_change_msg = (char*) "(no change)";
a61af66fc99e Initial load duke parents: diff changeset	598 if (change_young_gen_for_min_pauses() ==
a61af66fc99e Initial load duke parents: diff changeset	599 decrease_young_gen_for_min_pauses_true) {
a61af66fc99e Initial load duke parents: diff changeset	600 young_gen_action = shrink_msg;
a61af66fc99e Initial load duke parents: diff changeset	601 } else if (change_for_pause) {
a61af66fc99e Initial load duke parents: diff changeset	602 young_gen_action = no_change_msg;
a61af66fc99e Initial load duke parents: diff changeset	603 }
a61af66fc99e Initial load duke parents: diff changeset	604
a61af66fc99e Initial load duke parents: diff changeset	605 if (change_old_gen_for_maj_pauses() == decrease_old_gen_for_maj_pauses_true) {
a61af66fc99e Initial load duke parents: diff changeset	606 tenured_gen_action = shrink_msg;
a61af66fc99e Initial load duke parents: diff changeset	607 } else if (change_for_pause) {
a61af66fc99e Initial load duke parents: diff changeset	608 tenured_gen_action = no_change_msg;
a61af66fc99e Initial load duke parents: diff changeset	609 }
a61af66fc99e Initial load duke parents: diff changeset	610
a61af66fc99e Initial load duke parents: diff changeset	611 // Throughput
a61af66fc99e Initial load duke parents: diff changeset	612 if (change_old_gen_for_throughput() == increase_old_gen_for_throughput_true) {
a61af66fc99e Initial load duke parents: diff changeset	613 assert(change_young_gen_for_throughput() ==
a61af66fc99e Initial load duke parents: diff changeset	614 increase_young_gen_for_througput_true,
a61af66fc99e Initial load duke parents: diff changeset	615 "Both generations should be growing");
a61af66fc99e Initial load duke parents: diff changeset	616 young_gen_action = grow_msg;
a61af66fc99e Initial load duke parents: diff changeset	617 tenured_gen_action = grow_msg;
a61af66fc99e Initial load duke parents: diff changeset	618 } else if (change_young_gen_for_throughput() ==
a61af66fc99e Initial load duke parents: diff changeset	619 increase_young_gen_for_througput_true) {
a61af66fc99e Initial load duke parents: diff changeset	620 // Only the young generation may grow at start up (before
a61af66fc99e Initial load duke parents: diff changeset	621 // enough full collections have been done to grow the old generation).
a61af66fc99e Initial load duke parents: diff changeset	622 young_gen_action = grow_msg;
a61af66fc99e Initial load duke parents: diff changeset	623 tenured_gen_action = no_change_msg;
a61af66fc99e Initial load duke parents: diff changeset	624 }
a61af66fc99e Initial load duke parents: diff changeset	625
a61af66fc99e Initial load duke parents: diff changeset	626 // Minimum footprint
a61af66fc99e Initial load duke parents: diff changeset	627 if (decrease_for_footprint() != 0) {
a61af66fc99e Initial load duke parents: diff changeset	628 young_gen_action = shrink_msg;
a61af66fc99e Initial load duke parents: diff changeset	629 tenured_gen_action = shrink_msg;
a61af66fc99e Initial load duke parents: diff changeset	630 }
a61af66fc99e Initial load duke parents: diff changeset	631
a61af66fc99e Initial load duke parents: diff changeset	632 st->print_cr(" UseAdaptiveSizePolicy actions to meet %s", action);
a61af66fc99e Initial load duke parents: diff changeset	633 st->print_cr(" GC overhead (%%)");
a61af66fc99e Initial load duke parents: diff changeset	634 st->print_cr(" Young generation: %7.2f\t %s",
a61af66fc99e Initial load duke parents: diff changeset	635 100.0 * avg_minor_gc_cost()->average(),
a61af66fc99e Initial load duke parents: diff changeset	636 young_gen_action);
a61af66fc99e Initial load duke parents: diff changeset	637 st->print_cr(" Tenured generation: %7.2f\t %s",
a61af66fc99e Initial load duke parents: diff changeset	638 100.0 * avg_major_gc_cost()->average(),
a61af66fc99e Initial load duke parents: diff changeset	639 tenured_gen_action);
a61af66fc99e Initial load duke parents: diff changeset	640 return true;
a61af66fc99e Initial load duke parents: diff changeset	641 }
a61af66fc99e Initial load duke parents: diff changeset	642
a61af66fc99e Initial load duke parents: diff changeset	643 bool AdaptiveSizePolicy::print_adaptive_size_policy_on(
a61af66fc99e Initial load duke parents: diff changeset	644 outputStream* st,
6818 22b8d3d181d9 8000351: Tenuring threshold should be unsigned jwilhelm parents: 4095 diff changeset	645 uint tenuring_threshold_arg) const {
0 a61af66fc99e Initial load duke parents: diff changeset	646 if (!AdaptiveSizePolicy::print_adaptive_size_policy_on(st)) {
a61af66fc99e Initial load duke parents: diff changeset	647 return false;
a61af66fc99e Initial load duke parents: diff changeset	648 }
a61af66fc99e Initial load duke parents: diff changeset	649
a61af66fc99e Initial load duke parents: diff changeset	650 // Tenuring threshold
a61af66fc99e Initial load duke parents: diff changeset	651 bool tenuring_threshold_changed = true;
a61af66fc99e Initial load duke parents: diff changeset	652 if (decrement_tenuring_threshold_for_survivor_limit()) {
a61af66fc99e Initial load duke parents: diff changeset	653 st->print(" Tenuring threshold: (attempted to decrease to avoid"
a61af66fc99e Initial load duke parents: diff changeset	654 " survivor space overflow) = ");
a61af66fc99e Initial load duke parents: diff changeset	655 } else if (decrement_tenuring_threshold_for_gc_cost()) {
a61af66fc99e Initial load duke parents: diff changeset	656 st->print(" Tenuring threshold: (attempted to decrease to balance"
a61af66fc99e Initial load duke parents: diff changeset	657 " GC costs) = ");
a61af66fc99e Initial load duke parents: diff changeset	658 } else if (increment_tenuring_threshold_for_gc_cost()) {
a61af66fc99e Initial load duke parents: diff changeset	659 st->print(" Tenuring threshold: (attempted to increase to balance"
a61af66fc99e Initial load duke parents: diff changeset	660 " GC costs) = ");
a61af66fc99e Initial load duke parents: diff changeset	661 } else {
a61af66fc99e Initial load duke parents: diff changeset	662 tenuring_threshold_changed = false;
a61af66fc99e Initial load duke parents: diff changeset	663 assert(!tenuring_threshold_change(), "(no change was attempted)");
a61af66fc99e Initial load duke parents: diff changeset	664 }
a61af66fc99e Initial load duke parents: diff changeset	665 if (tenuring_threshold_changed) {
6818 22b8d3d181d9 8000351: Tenuring threshold should be unsigned jwilhelm parents: 4095 diff changeset	666 st->print_cr("%u", tenuring_threshold_arg);
0 a61af66fc99e Initial load duke parents: diff changeset	667 }
a61af66fc99e Initial load duke parents: diff changeset	668 return true;
a61af66fc99e Initial load duke parents: diff changeset	669 }

Mercurial > hg > graal-compiler

annotate src/share/vm/gc_implementation/shared/adaptiveSizePolicy.cpp @ 6818:22b8d3d181d9