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1 /*
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579
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2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 /* Copyright 1992-2009 Sun Microsystems, Inc. and Stanford University.
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26 See the LICENSE file for license information. */
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27
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28 # include "incls/_precompiled.incl"
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29 # include "incls/_ageTable.cpp.incl"
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30
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31 ageTable::ageTable(bool global) {
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32
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33 clear();
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34
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35 if (UsePerfData && global) {
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36
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37 ResourceMark rm;
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38 EXCEPTION_MARK;
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39
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40 const char* agetable_ns = "generation.0.agetable";
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41 const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes");
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42
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43 for(int age = 0; age < table_size; age ++) {
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44 char age_name[10];
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45 jio_snprintf(age_name, sizeof(age_name), "%2.2d", age);
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46 const char* cname = PerfDataManager::counter_name(bytes_ns, age_name);
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47 _perf_sizes[age] = PerfDataManager::create_variable(SUN_GC, cname,
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48 PerfData::U_Bytes,
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49 CHECK);
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50 }
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51
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52 const char* cname = PerfDataManager::counter_name(agetable_ns, "size");
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53 PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None,
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54 table_size, CHECK);
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55 }
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56 }
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57
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58 void ageTable::clear() {
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59 for (size_t* p = sizes; p < sizes + table_size; ++p) {
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60 *p = 0;
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61 }
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62 }
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63
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64 void ageTable::merge(ageTable* subTable) {
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65 for (int i = 0; i < table_size; i++) {
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66 sizes[i]+= subTable->sizes[i];
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67 }
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68 }
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69
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70 void ageTable::merge_par(ageTable* subTable) {
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71 for (int i = 0; i < table_size; i++) {
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72 Atomic::add_ptr(subTable->sizes[i], &sizes[i]);
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73 }
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74 }
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75
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76 int ageTable::compute_tenuring_threshold(size_t survivor_capacity) {
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77 size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);
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78 size_t total = 0;
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79 int age = 1;
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80 assert(sizes[0] == 0, "no objects with age zero should be recorded");
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81 while (age < table_size) {
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82 total += sizes[age];
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83 // check if including objects of age 'age' made us pass the desired
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84 // size, if so 'age' is the new threshold
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85 if (total > desired_survivor_size) break;
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86 age++;
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87 }
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88 int result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;
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89
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90 if (PrintTenuringDistribution || UsePerfData) {
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91
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92 if (PrintTenuringDistribution) {
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93 gclog_or_tty->cr();
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94 gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %d (max %d)",
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95 desired_survivor_size*oopSize, result, MaxTenuringThreshold);
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96 }
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97
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98 total = 0;
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99 age = 1;
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100 while (age < table_size) {
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101 total += sizes[age];
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102 if (sizes[age] > 0) {
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103 if (PrintTenuringDistribution) {
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104 gclog_or_tty->print_cr("- age %3d: %10ld bytes, %10ld total",
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105 age, sizes[age]*oopSize, total*oopSize);
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106 }
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107 }
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108 if (UsePerfData) {
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109 _perf_sizes[age]->set_value(sizes[age]*oopSize);
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110 }
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111 age++;
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112 }
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113 if (UsePerfData) {
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114 SharedHeap* sh = SharedHeap::heap();
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115 CollectorPolicy* policy = sh->collector_policy();
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116 GCPolicyCounters* gc_counters = policy->counters();
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117 gc_counters->tenuring_threshold()->set_value(result);
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118 gc_counters->desired_survivor_size()->set_value(
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119 desired_survivor_size*oopSize);
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120 }
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121 }
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122
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123 return result;
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124 }
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