| /* |
| * Copyright (c) 1997, 2014, 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]); |
| } |
| } |
| |
| uint ageTable::compute_tenuring_threshold(size_t survivor_capacity) { |
| size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100); |
| size_t total = 0; |
| uint 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++; |
| } |
| uint result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold; |
| |
| if (PrintTenuringDistribution || UsePerfData) { |
| |
| if (PrintTenuringDistribution) { |
| gclog_or_tty->cr(); |
| gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold %u (max %u)", |
| desired_survivor_size*oopSize, result, (int) MaxTenuringThreshold); |
| } |
| |
| total = 0; |
| age = 1; |
| while (age < table_size) { |
| total += sizes[age]; |
| if (sizes[age] > 0) { |
| if (PrintTenuringDistribution) { |
| gclog_or_tty->print_cr("- age %3u: " SIZE_FORMAT_W(10) " bytes, " SIZE_FORMAT_W(10) " 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; |
| } |