Mercurial > hg > truffle
diff src/share/vm/gc_implementation/shared/ageTable.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 58054a18d735 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/shared/ageTable.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,118 @@ +/* + * Copyright 1997-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +/* Copyright 1992 Sun Microsystems, Inc. and Stanford University. + See the LICENSE file for license information. */ + +# include "incls/_precompiled.incl" +# include "incls/_ageTable.cpp.incl" + +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]; + } +} + +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; +}