duke@435: /*
duke@435:  * Copyright 1997-2004 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: /* Copyright 1992 Sun Microsystems, Inc. and Stanford University.
duke@435:    See the LICENSE file for license information. */
duke@435: 
duke@435: # include "incls/_precompiled.incl"
duke@435: # include "incls/_ageTable.cpp.incl"
duke@435: 
duke@435: ageTable::ageTable(bool global) {
duke@435: 
duke@435:   clear();
duke@435: 
duke@435:   if (UsePerfData && global) {
duke@435: 
duke@435:     ResourceMark rm;
duke@435:     EXCEPTION_MARK;
duke@435: 
duke@435:     const char* agetable_ns = "generation.0.agetable";
duke@435:     const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes");
duke@435: 
duke@435:     for(int age = 0; age < table_size; age ++) {
duke@435:       char age_name[10];
duke@435:       jio_snprintf(age_name, sizeof(age_name), "%2.2d", age);
duke@435:       const char* cname = PerfDataManager::counter_name(bytes_ns, age_name);
duke@435:       _perf_sizes[age] = PerfDataManager::create_variable(SUN_GC, cname,
duke@435:                                                           PerfData::U_Bytes,
duke@435:                                                           CHECK);
duke@435:     }
duke@435: 
duke@435:     const char* cname = PerfDataManager::counter_name(agetable_ns, "size");
duke@435:     PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None,
duke@435:                                      table_size, CHECK);
duke@435:   }
duke@435: }
duke@435: 
duke@435: void ageTable::clear() {
duke@435:   for (size_t* p = sizes; p < sizes + table_size; ++p) {
duke@435:     *p = 0;
duke@435:   }
duke@435: }
duke@435: 
duke@435: void ageTable::merge(ageTable* subTable) {
duke@435:   for (int i = 0; i < table_size; i++) {
duke@435:     sizes[i]+= subTable->sizes[i];
duke@435:   }
duke@435: }
duke@435: 
duke@435: int ageTable::compute_tenuring_threshold(size_t survivor_capacity) {
duke@435:   size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);
duke@435:   size_t total = 0;
duke@435:   int age = 1;
duke@435:   assert(sizes[0] == 0, "no objects with age zero should be recorded");
duke@435:   while (age < table_size) {
duke@435:     total += sizes[age];
duke@435:     // check if including objects of age 'age' made us pass the desired
duke@435:     // size, if so 'age' is the new threshold
duke@435:     if (total > desired_survivor_size) break;
duke@435:     age++;
duke@435:   }
duke@435:   int result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;
duke@435: 
duke@435:   if (PrintTenuringDistribution || UsePerfData) {
duke@435: 
duke@435:     if (PrintTenuringDistribution) {
duke@435:       gclog_or_tty->cr();
duke@435:       gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %d (max %d)",
duke@435:         desired_survivor_size*oopSize, result, MaxTenuringThreshold);
duke@435:     }
duke@435: 
duke@435:     total = 0;
duke@435:     age = 1;
duke@435:     while (age < table_size) {
duke@435:       total += sizes[age];
duke@435:       if (sizes[age] > 0) {
duke@435:         if (PrintTenuringDistribution) {
duke@435:           gclog_or_tty->print_cr("- age %3d: %10ld bytes, %10ld total",
duke@435:             age, sizes[age]*oopSize, total*oopSize);
duke@435:         }
duke@435:       }
duke@435:       if (UsePerfData) {
duke@435:         _perf_sizes[age]->set_value(sizes[age]*oopSize);
duke@435:       }
duke@435:       age++;
duke@435:     }
duke@435:     if (UsePerfData) {
duke@435:       SharedHeap* sh = SharedHeap::heap();
duke@435:       CollectorPolicy* policy = sh->collector_policy();
duke@435:       GCPolicyCounters* gc_counters = policy->counters();
duke@435:       gc_counters->tenuring_threshold()->set_value(result);
duke@435:       gc_counters->desired_survivor_size()->set_value(
duke@435:         desired_survivor_size*oopSize);
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   return result;
duke@435: }