/*
* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "gc_implementation/shared/ageTable.hpp"
#include "gc_implementation/shared/gcPolicyCounters.hpp"
#include "memory/collectorPolicy.hpp"
#include "memory/resourceArea.hpp"
#include "memory/sharedHeap.hpp"
#include "utilities/copy.hpp"
/* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University.
See the LICENSE file for license information. */
ageTable::ageTable(bool global) {
clear();
if (UsePerfData && global) {
ResourceMark rm;
EXCEPTION_MARK;
const char* agetable_ns = "generation.0.agetable";
const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes");
for(int age = 0; age < table_size; age ++) {
char age_name[10];
jio_snprintf(age_name, sizeof(age_name), "%2.2d", age);
const char* cname = PerfDataManager::counter_name(bytes_ns, age_name);
_perf_sizes[age] = PerfDataManager::create_variable(SUN_GC, cname,
PerfData::U_Bytes,
CHECK);
}
const char* cname = PerfDataManager::counter_name(agetable_ns, "size");
PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None,
table_size, CHECK);
}
}
void ageTable::clear() {
for (size_t* p = sizes; p < sizes + table_size; ++p) {
*p = 0;
}
}
void ageTable::merge(ageTable* subTable) {
for (int i = 0; i < table_size; i++) {
sizes[i]+= subTable->sizes[i];
}
}
void ageTable::merge_par(ageTable* subTable) {
for (int i = 0; i < table_size; i++) {
Atomic::add_ptr(subTable->sizes[i], &sizes[i]);
}
}
int ageTable::compute_tenuring_threshold(size_t survivor_capacity) {
size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);
size_t total = 0;
int age = 1;
assert(sizes[0] == 0, "no objects with age zero should be recorded");
while (age < table_size) {
total += sizes[age];
// check if including objects of age 'age' made us pass the desired
// size, if so 'age' is the new threshold
if (total > desired_survivor_size) break;
age++;
}
int result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;
if (PrintTenuringDistribution || UsePerfData) {
if (PrintTenuringDistribution) {
gclog_or_tty->cr();
gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %d (max %d)",
desired_survivor_size*oopSize, result, MaxTenuringThreshold);
}
total = 0;
age = 1;
while (age < table_size) {
total += sizes[age];
if (sizes[age] > 0) {
if (PrintTenuringDistribution) {
gclog_or_tty->print_cr("- age %3d: %10ld bytes, %10ld total",
age, sizes[age]*oopSize, total*oopSize);
}
}
if (UsePerfData) {
_perf_sizes[age]->set_value(sizes[age]*oopSize);
}
age++;
}
if (UsePerfData) {
SharedHeap* sh = SharedHeap::heap();
CollectorPolicy* policy = sh->collector_policy();
GCPolicyCounters* gc_counters = policy->counters();
gc_counters->tenuring_threshold()->set_value(result);
gc_counters->desired_survivor_size()->set_value(
desired_survivor_size*oopSize);
}
}
return result;
}