Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2001, 2012, 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_implementation/g1/g1CollectedHeap.inline.hpp"

 #include "gc_implementation/g1/g1CollectorPolicy.hpp"

 #include "gc_implementation/g1/heapRegion.hpp"

 #include "gc_implementation/g1/survRateGroup.hpp"

 #include "memory/allocation.hpp"

 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),

     _stats_arrays_length(0) {

   reset();

   if (summary_surv_rates_len > 0) {

     size_t length = summary_surv_rates_len;

       _summary_surv_rates = NEW_C_HEAP_ARRAY(NumberSeq*, length, mtGC);

     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;

   _accum_surv_rate       = 0.0;

   _last_pred             = 0.0;

   // the following will set up the arrays with length 1

   _region_num            = 1;

   // The call to stop_adding_regions() will use "new" to refill

   // the _surv_rate_pred array, so we need to make sure to call

   // "delete".

   for (size_t i = 0; i < _stats_arrays_length; ++i) {

     delete _surv_rate_pred[i];

   }

   _stats_arrays_length = 0;

   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;

 }

 void

 SurvRateGroup::stop_adding_regions() {

   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, mtGC);

     _accum_surv_rate_pred = NEW_C_HEAP_ARRAY(double, _region_num, mtGC);

     _surv_rate_pred = NEW_C_HEAP_ARRAY(TruncatedSeq*, _region_num, mtGC);

     for (size_t i = 0; i < _stats_arrays_length; ++i) {

       _surv_rate_pred[i] = old_surv_rate_pred[i];

     }

     for (size_t i = _stats_arrays_length; i < _region_num; ++i) {

       _surv_rate_pred[i] = new TruncatedSeq(10);

     }

     _stats_arrays_length = _region_num;

     if (old_surv_rate != NULL) {

       FREE_C_HEAP_ARRAY(double, old_surv_rate, mtGC);

     }

     if (old_accum_surv_rate_pred != NULL) {

       FREE_C_HEAP_ARRAY(double, old_accum_surv_rate_pred, mtGC);

     }

     if (old_surv_rate_pred != NULL) {

       FREE_C_HEAP_ARRAY(TruncatedSeq*, old_surv_rate_pred, mtGC);

     }

   }

   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();

     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