diff -r e45861098f5a -r fec48bf5a827 hotspot/src/share/vm/gc/shared/ageTable.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hotspot/src/share/vm/gc/shared/ageTable.cpp Wed May 13 15:16:06 2015 +0200 @@ -0,0 +1,136 @@ +/* + * Copyright (c) 1997, 2015, 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/shared/ageTable.hpp" +#include "gc/shared/collectedHeap.hpp" +#include "gc/shared/collectorPolicy.hpp" +#include "gc/shared/gcPolicyCounters.hpp" +#include "memory/resourceArea.hpp" +#include "runtime/atomic.inline.hpp" +#include "utilities/copy.hpp" + +/* Copyright (c) 1992, 2015, 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, GCPolicyCounters* gc_counters) { + size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100); + uint result; + + if (AlwaysTenure || NeverTenure) { + assert(MaxTenuringThreshold == 0 || MaxTenuringThreshold == markOopDesc::max_age + 1, + err_msg("MaxTenuringThreshold should be 0 or markOopDesc::max_age + 1, but is " UINTX_FORMAT, MaxTenuringThreshold)); + result = MaxTenuringThreshold; + } else { + 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++; + } + 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 " + UINTX_FORMAT " (max threshold " UINTX_FORMAT ")", + desired_survivor_size*oopSize, (uintx) result, MaxTenuringThreshold); + } + + size_t total = 0; + uint 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) { + gc_counters->tenuring_threshold()->set_value(result); + gc_counters->desired_survivor_size()->set_value( + desired_survivor_size*oopSize); + } + } + + return result; +}