/*

 * 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;

}