137 lines
4.6 KiB
C++
137 lines
4.6 KiB
C++
/*
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* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "gc/shared/ageTable.hpp"
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#include "gc/shared/collectedHeap.hpp"
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#include "gc/shared/collectorPolicy.hpp"
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#include "gc/shared/gcPolicyCounters.hpp"
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#include "memory/resourceArea.hpp"
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#include "runtime/atomic.inline.hpp"
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#include "utilities/copy.hpp"
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/* Copyright (c) 1992, 2015, Oracle and/or its affiliates, and Stanford University.
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See the LICENSE file for license information. */
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ageTable::ageTable(bool global) {
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clear();
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if (UsePerfData && global) {
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ResourceMark rm;
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EXCEPTION_MARK;
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const char* agetable_ns = "generation.0.agetable";
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const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes");
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for(int age = 0; age < table_size; age ++) {
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char age_name[10];
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jio_snprintf(age_name, sizeof(age_name), "%2.2d", age);
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const char* cname = PerfDataManager::counter_name(bytes_ns, age_name);
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_perf_sizes[age] = PerfDataManager::create_variable(SUN_GC, cname,
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PerfData::U_Bytes,
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CHECK);
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}
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const char* cname = PerfDataManager::counter_name(agetable_ns, "size");
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PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None,
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table_size, CHECK);
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}
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}
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void ageTable::clear() {
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for (size_t* p = sizes; p < sizes + table_size; ++p) {
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*p = 0;
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}
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}
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void ageTable::merge(ageTable* subTable) {
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for (int i = 0; i < table_size; i++) {
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sizes[i]+= subTable->sizes[i];
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}
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}
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void ageTable::merge_par(ageTable* subTable) {
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for (int i = 0; i < table_size; i++) {
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Atomic::add_ptr(subTable->sizes[i], &sizes[i]);
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}
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}
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uint ageTable::compute_tenuring_threshold(size_t survivor_capacity, GCPolicyCounters* gc_counters) {
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size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);
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uint result;
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if (AlwaysTenure || NeverTenure) {
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assert(MaxTenuringThreshold == 0 || MaxTenuringThreshold == markOopDesc::max_age + 1,
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err_msg("MaxTenuringThreshold should be 0 or markOopDesc::max_age + 1, but is " UINTX_FORMAT, MaxTenuringThreshold));
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result = MaxTenuringThreshold;
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} else {
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size_t total = 0;
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uint age = 1;
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assert(sizes[0] == 0, "no objects with age zero should be recorded");
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while (age < table_size) {
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total += sizes[age];
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// check if including objects of age 'age' made us pass the desired
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// size, if so 'age' is the new threshold
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if (total > desired_survivor_size) break;
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age++;
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}
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result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;
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}
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if (PrintTenuringDistribution || UsePerfData) {
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if (PrintTenuringDistribution) {
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gclog_or_tty->cr();
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gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold "
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UINTX_FORMAT " (max threshold " UINTX_FORMAT ")",
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desired_survivor_size*oopSize, (uintx) result, MaxTenuringThreshold);
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}
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size_t total = 0;
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uint age = 1;
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while (age < table_size) {
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total += sizes[age];
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if (sizes[age] > 0) {
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if (PrintTenuringDistribution) {
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gclog_or_tty->print_cr("- age %3u: " SIZE_FORMAT_W(10) " bytes, " SIZE_FORMAT_W(10) " total",
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age, sizes[age]*oopSize, total*oopSize);
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}
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}
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if (UsePerfData) {
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_perf_sizes[age]->set_value(sizes[age]*oopSize);
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}
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age++;
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}
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if (UsePerfData) {
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gc_counters->tenuring_threshold()->set_value(result);
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gc_counters->desired_survivor_size()->set_value(
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desired_survivor_size*oopSize);
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}
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}
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return result;
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}
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