jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/survRateGroup.cpp@2d160770d2e5 (annotated)

src/share/vm/gc_implementation/g1/survRateGroup.cpp@2d160770d2e5 (annotated)

src/share/vm/gc_implementation/g1/survRateGroup.cpp

Mon, 02 Aug 2010 12:51:43 -0700

author: johnc
date: Mon, 02 Aug 2010 12:51:43 -0700
changeset 2060: 2d160770d2e5
parent 1907: c18cbe5936b8
child 2314: f95d63e2154a
permissions: -rw-r--r--

6814437: G1: remove the _new_refs array
Summary: The per-worker _new_refs array is used to hold references that point into the collection set. It is populated during RSet updating and subsequently processed. In the event of an evacuation failure it processed again to recreate the RSets of regions in the collection set. Remove the per-worker _new_refs array by processing the references directly. Use a DirtyCardQueue to hold the cards containing the references so that the RSets of regions in the collection set can be recreated when handling an evacuation failure.
Reviewed-by: iveresov, jmasa, tonyp

 /*
  * Copyright (c) 2001, 2010, 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 "incls/_precompiled.incl"
 #include "incls/_survRateGroup.cpp.incl"
 SurvRateGroup::SurvRateGroup(G1CollectorPolicy* g1p,
                              const char* name,
                              size_t summary_surv_rates_len) :
     _g1p(g1p), _name(name),
     _summary_surv_rates_len(summary_surv_rates_len),
     _summary_surv_rates_max_len(0),
     _summary_surv_rates(NULL),
     _surv_rate(NULL),
     _accum_surv_rate_pred(NULL),
     _surv_rate_pred(NULL)
 {
   reset();
   if (summary_surv_rates_len > 0) {
     size_t length = summary_surv_rates_len;
       _summary_surv_rates = NEW_C_HEAP_ARRAY(NumberSeq*, length);
     if (_summary_surv_rates == NULL) {
       vm_exit_out_of_memory(sizeof(NumberSeq*) * length,
                             "Not enough space for surv rate summary");
     }
     for (size_t i = 0; i < length; ++i)
       _summary_surv_rates[i] = new NumberSeq();
   }
   start_adding_regions();
 }
 void SurvRateGroup::reset()
 {
   _all_regions_allocated = 0;
   _setup_seq_num         = 0;
   _stats_arrays_length   = 0;
   _accum_surv_rate       = 0.0;
   _last_pred             = 0.0;
   // the following will set up the arrays with length 1
   _region_num            = 1;
   stop_adding_regions();
   guarantee( _stats_arrays_length == 1, "invariant" );
   guarantee( _surv_rate_pred[0] != NULL, "invariant" );
   _surv_rate_pred[0]->add(0.4);
   all_surviving_words_recorded(false);
   _region_num = 0;
 }
 void
 SurvRateGroup::start_adding_regions() {
   _setup_seq_num   = _stats_arrays_length;
   _region_num      = 0;
   _accum_surv_rate = 0.0;
 #if 0
   gclog_or_tty->print_cr("[%s] start adding regions, seq num %d, length %d",
                          _name, _setup_seq_num, _region_num);
 #endif // 0
 }
 void
 SurvRateGroup::stop_adding_regions() {
 #if 0
   gclog_or_tty->print_cr("[%s] stop adding regions, length %d", _name, _region_num);
 #endif // 0
   if (_region_num > _stats_arrays_length) {
     double* old_surv_rate = _surv_rate;
     double* old_accum_surv_rate_pred = _accum_surv_rate_pred;
     TruncatedSeq** old_surv_rate_pred = _surv_rate_pred;
     _surv_rate = NEW_C_HEAP_ARRAY(double, _region_num);
     if (_surv_rate == NULL) {
       vm_exit_out_of_memory(sizeof(double) * _region_num,
                             "Not enough space for surv rate array.");
     }
     _accum_surv_rate_pred = NEW_C_HEAP_ARRAY(double, _region_num);
     if (_accum_surv_rate_pred == NULL) {
       vm_exit_out_of_memory(sizeof(double) * _region_num,
                          "Not enough space for accum surv rate pred array.");
     }
     _surv_rate_pred = NEW_C_HEAP_ARRAY(TruncatedSeq*, _region_num);
     if (_surv_rate == NULL) {
       vm_exit_out_of_memory(sizeof(TruncatedSeq*) * _region_num,
                             "Not enough space for surv rate pred array.");
     }
     for (size_t i = 0; i < _stats_arrays_length; ++i)
       _surv_rate_pred[i] = old_surv_rate_pred[i];
 #if 0
     gclog_or_tty->print_cr("[%s] stop adding regions, new seqs %d to %d",
                   _name, _array_length, _region_num - 1);
 #endif // 0
     for (size_t i = _stats_arrays_length; i < _region_num; ++i) {
       _surv_rate_pred[i] = new TruncatedSeq(10);
       // _surv_rate_pred[i]->add(last_pred);
     }
     _stats_arrays_length = _region_num;
     if (old_surv_rate != NULL)
       FREE_C_HEAP_ARRAY(double, old_surv_rate);
     if (old_accum_surv_rate_pred != NULL)
       FREE_C_HEAP_ARRAY(double, old_accum_surv_rate_pred);
     if (old_surv_rate_pred != NULL)
       FREE_C_HEAP_ARRAY(NumberSeq*, old_surv_rate_pred);
   }
   for (size_t i = 0; i < _stats_arrays_length; ++i)
     _surv_rate[i] = 0.0;
 }
 double
 SurvRateGroup::accum_surv_rate(size_t adjustment) {
   // we might relax this one in the future...
   guarantee( adjustment == 0 || adjustment == 1, "pre-condition" );
   double ret = _accum_surv_rate;
   if (adjustment > 0) {
     TruncatedSeq* seq = get_seq(_region_num+1);
     double surv_rate = _g1p->get_new_prediction(seq);
     ret += surv_rate;
   }
   return ret;
 }
 int
 SurvRateGroup::next_age_index() {
   TruncatedSeq* seq = get_seq(_region_num);
   double surv_rate = _g1p->get_new_prediction(seq);
   _accum_surv_rate += surv_rate;
   ++_region_num;
   return (int) ++_all_regions_allocated;
 }
 void
 SurvRateGroup::record_surviving_words(int age_in_group, size_t surv_words) {
   guarantee( 0 <= age_in_group && (size_t) age_in_group < _region_num,
              "pre-condition" );
   guarantee( _surv_rate[age_in_group] <= 0.00001,
              "should only update each slot once" );
   double surv_rate = (double) surv_words / (double) HeapRegion::GrainWords;
   _surv_rate[age_in_group] = surv_rate;
   _surv_rate_pred[age_in_group]->add(surv_rate);
   if ((size_t)age_in_group < _summary_surv_rates_len) {
     _summary_surv_rates[age_in_group]->add(surv_rate);
     if ((size_t)(age_in_group+1) > _summary_surv_rates_max_len)
       _summary_surv_rates_max_len = age_in_group+1;
   }
 }
 void
 SurvRateGroup::all_surviving_words_recorded(bool propagate) {
   if (propagate && _region_num > 0) { // conservative
     double surv_rate = _surv_rate_pred[_region_num-1]->last();
 #if 0
     gclog_or_tty->print_cr("propagating %1.2lf from %d to %d",
                   surv_rate, _curr_length, _array_length - 1);
 #endif // 0
     for (size_t i = _region_num; i < _stats_arrays_length; ++i) {
       guarantee( _surv_rate[i] <= 0.00001,
                  "the slot should not have been updated" );
       _surv_rate_pred[i]->add(surv_rate);
     }
   }
   double accum = 0.0;
   double pred = 0.0;
   for (size_t i = 0; i < _stats_arrays_length; ++i) {
     pred = _g1p->get_new_prediction(_surv_rate_pred[i]);
     if (pred > 1.0) pred = 1.0;
     accum += pred;
     _accum_surv_rate_pred[i] = accum;
     // gclog_or_tty->print_cr("age %3d, accum %10.2lf", i, accum);
   }
   _last_pred = pred;
 }
 #ifndef PRODUCT
 void
 SurvRateGroup::print() {
   gclog_or_tty->print_cr("Surv Rate Group: %s (%d entries)",
                 _name, _region_num);
   for (size_t i = 0; i < _region_num; ++i) {
     gclog_or_tty->print_cr("    age %4d   surv rate %6.2lf %%   pred %6.2lf %%",
                   i, _surv_rate[i] * 100.0,
                   _g1p->get_new_prediction(_surv_rate_pred[i]) * 100.0);
   }
 }
 void
 SurvRateGroup::print_surv_rate_summary() {
   size_t length = _summary_surv_rates_max_len;
   if (length == 0)
     return;
   gclog_or_tty->print_cr("");
   gclog_or_tty->print_cr("%s Rate Summary (for up to age %d)", _name, length-1);
   gclog_or_tty->print_cr("      age range     survival rate (avg)      samples (avg)");
   gclog_or_tty->print_cr("  ---------------------------------------------------------");
   size_t index = 0;
   size_t limit = MIN2((int) length, 10);
   while (index < limit) {
     gclog_or_tty->print_cr("           %4d                 %6.2lf%%             %6.2lf",
                   index, _summary_surv_rates[index]->avg() * 100.0,
                   (double) _summary_surv_rates[index]->num());
     ++index;
   }
   gclog_or_tty->print_cr("  ---------------------------------------------------------");
   int num = 0;
   double sum = 0.0;
   int samples = 0;
   while (index < length) {
     ++num;
     sum += _summary_surv_rates[index]->avg() * 100.0;
     samples += _summary_surv_rates[index]->num();
     ++index;
     if (index == length || num % 10 == 0) {
       gclog_or_tty->print_cr("   %4d .. %4d                 %6.2lf%%             %6.2lf",
                     (index-1) / 10 * 10, index-1, sum / (double) num,
                     (double) samples / (double) num);
       sum = 0.0;
       num = 0;
       samples = 0;
     }
   }
   gclog_or_tty->print_cr("  ---------------------------------------------------------");
 }
 #endif // PRODUCT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/survRateGroup.cpp@2d160770d2e5 (annotated)

src/share/vm/gc_implementation/g1/survRateGroup.cpp