1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/shared/ageTable.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,118 @@
1.4 +/*
1.5 + * Copyright 1997-2004 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +/* Copyright 1992 Sun Microsystems, Inc. and Stanford University.
1.29 + See the LICENSE file for license information. */
1.30 +
1.31 +# include "incls/_precompiled.incl"
1.32 +# include "incls/_ageTable.cpp.incl"
1.33 +
1.34 +ageTable::ageTable(bool global) {
1.35 +
1.36 + clear();
1.37 +
1.38 + if (UsePerfData && global) {
1.39 +
1.40 + ResourceMark rm;
1.41 + EXCEPTION_MARK;
1.42 +
1.43 + const char* agetable_ns = "generation.0.agetable";
1.44 + const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes");
1.45 +
1.46 + for(int age = 0; age < table_size; age ++) {
1.47 + char age_name[10];
1.48 + jio_snprintf(age_name, sizeof(age_name), "%2.2d", age);
1.49 + const char* cname = PerfDataManager::counter_name(bytes_ns, age_name);
1.50 + _perf_sizes[age] = PerfDataManager::create_variable(SUN_GC, cname,
1.51 + PerfData::U_Bytes,
1.52 + CHECK);
1.53 + }
1.54 +
1.55 + const char* cname = PerfDataManager::counter_name(agetable_ns, "size");
1.56 + PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None,
1.57 + table_size, CHECK);
1.58 + }
1.59 +}
1.60 +
1.61 +void ageTable::clear() {
1.62 + for (size_t* p = sizes; p < sizes + table_size; ++p) {
1.63 + *p = 0;
1.64 + }
1.65 +}
1.66 +
1.67 +void ageTable::merge(ageTable* subTable) {
1.68 + for (int i = 0; i < table_size; i++) {
1.69 + sizes[i]+= subTable->sizes[i];
1.70 + }
1.71 +}
1.72 +
1.73 +int ageTable::compute_tenuring_threshold(size_t survivor_capacity) {
1.74 + size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);
1.75 + size_t total = 0;
1.76 + int age = 1;
1.77 + assert(sizes[0] == 0, "no objects with age zero should be recorded");
1.78 + while (age < table_size) {
1.79 + total += sizes[age];
1.80 + // check if including objects of age 'age' made us pass the desired
1.81 + // size, if so 'age' is the new threshold
1.82 + if (total > desired_survivor_size) break;
1.83 + age++;
1.84 + }
1.85 + int result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;
1.86 +
1.87 + if (PrintTenuringDistribution || UsePerfData) {
1.88 +
1.89 + if (PrintTenuringDistribution) {
1.90 + gclog_or_tty->cr();
1.91 + gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %d (max %d)",
1.92 + desired_survivor_size*oopSize, result, MaxTenuringThreshold);
1.93 + }
1.94 +
1.95 + total = 0;
1.96 + age = 1;
1.97 + while (age < table_size) {
1.98 + total += sizes[age];
1.99 + if (sizes[age] > 0) {
1.100 + if (PrintTenuringDistribution) {
1.101 + gclog_or_tty->print_cr("- age %3d: %10ld bytes, %10ld total",
1.102 + age, sizes[age]*oopSize, total*oopSize);
1.103 + }
1.104 + }
1.105 + if (UsePerfData) {
1.106 + _perf_sizes[age]->set_value(sizes[age]*oopSize);
1.107 + }
1.108 + age++;
1.109 + }
1.110 + if (UsePerfData) {
1.111 + SharedHeap* sh = SharedHeap::heap();
1.112 + CollectorPolicy* policy = sh->collector_policy();
1.113 + GCPolicyCounters* gc_counters = policy->counters();
1.114 + gc_counters->tenuring_threshold()->set_value(result);
1.115 + gc_counters->desired_survivor_size()->set_value(
1.116 + desired_survivor_size*oopSize);
1.117 + }
1.118 + }
1.119 +
1.120 + return result;
1.121 +}
