--- a/src/share/vm/gc_implementation/g1/survRateGroup.cpp	Thu Feb 05 11:42:10 2009 -0800
+++ b/src/share/vm/gc_implementation/g1/survRateGroup.cpp	Fri Feb 06 01:38:50 2009 +0300
@@ -29,23 +29,14 @@
                              const char* name,
                              size_t summary_surv_rates_len) :
     _g1p(g1p), _name(name),
-    _all_regions_allocated(0),
-    _curr_length(0), _scan_only_prefix(0), _setup_seq_num(0),
-    _array_length(0), _surv_rate(NULL), _accum_surv_rate_pred(NULL),
-    _accum_surv_rate(0.0), _surv_rate_pred(NULL), _last_pred(0.0),
     _summary_surv_rates_len(summary_surv_rates_len),
     _summary_surv_rates_max_len(0),
-    _summary_surv_rates(NULL) {
-
-  // the following will set up the arrays with length 1
-  _curr_length = 1;
-  stop_adding_regions();
-  guarantee( _array_length == 1, "invariant" );
-  guarantee( _surv_rate_pred[0] != NULL, "invariant" );
-  _surv_rate_pred[0]->add(0.4);
-  all_surviving_words_recorded(false);
-  _curr_length = 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);
@@ -60,61 +51,80 @@
   start_adding_regions();
 }
 
+
+void SurvRateGroup::reset()
+{
+  _all_regions_allocated = 0;
+  _scan_only_prefix      = 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   = _array_length;
-  _curr_length     = _scan_only_prefix;
+  _setup_seq_num   = _stats_arrays_length;
+  _region_num      = _scan_only_prefix;
   _accum_surv_rate = 0.0;
 
 #if 0
-  gclog_or_tty->print_cr("start adding regions, seq num %d, length %d",
-                         _setup_seq_num, _curr_length);
+  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() {
-  size_t length = _curr_length;
 
 #if 0
-  gclog_or_tty->print_cr("stop adding regions, length %d", length);
+  gclog_or_tty->print_cr("[%s] stop adding regions, length %d", _name, _region_num);
 #endif // 0
 
-  if (length > _array_length) {
+  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, length);
+    _surv_rate = NEW_C_HEAP_ARRAY(double, _region_num);
     if (_surv_rate == NULL) {
-      vm_exit_out_of_memory(sizeof(double) * length,
+      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, length);
+    _accum_surv_rate_pred = NEW_C_HEAP_ARRAY(double, _region_num);
     if (_accum_surv_rate_pred == NULL) {
-      vm_exit_out_of_memory(sizeof(double) * length,
+      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*, length);
+    _surv_rate_pred = NEW_C_HEAP_ARRAY(TruncatedSeq*, _region_num);
     if (_surv_rate == NULL) {
-      vm_exit_out_of_memory(sizeof(TruncatedSeq*) * length,
+      vm_exit_out_of_memory(sizeof(TruncatedSeq*) * _region_num,
                             "Not enough space for surv rate pred array.");
     }
 
-    for (size_t i = 0; i < _array_length; ++i)
+    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("stop adding regions, new seqs %d to %d",
-                  _array_length, length - 1);
+    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 = _array_length; i < length; ++i) {
+    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);
     }
 
-    _array_length = length;
+    _stats_arrays_length = _region_num;
 
     if (old_surv_rate != NULL)
       FREE_C_HEAP_ARRAY(double, old_surv_rate);
@@ -124,7 +134,7 @@
       FREE_C_HEAP_ARRAY(NumberSeq*, old_surv_rate_pred);
   }
 
-  for (size_t i = 0; i < _array_length; ++i)
+  for (size_t i = 0; i < _stats_arrays_length; ++i)
     _surv_rate[i] = 0.0;
 }
 
@@ -135,7 +145,7 @@
 
   double ret = _accum_surv_rate;
   if (adjustment > 0) {
-    TruncatedSeq* seq = get_seq(_curr_length+1);
+    TruncatedSeq* seq = get_seq(_region_num+1);
     double surv_rate = _g1p->get_new_prediction(seq);
     ret += surv_rate;
   }
@@ -145,23 +155,23 @@
 
 int
 SurvRateGroup::next_age_index() {
-  TruncatedSeq* seq = get_seq(_curr_length);
+  TruncatedSeq* seq = get_seq(_region_num);
   double surv_rate = _g1p->get_new_prediction(seq);
   _accum_surv_rate += surv_rate;
 
-  ++_curr_length;
+  ++_region_num;
   return (int) ++_all_regions_allocated;
 }
 
 void
 SurvRateGroup::record_scan_only_prefix(size_t scan_only_prefix) {
-  guarantee( scan_only_prefix <= _curr_length, "pre-condition" );
+  guarantee( scan_only_prefix <= _region_num, "pre-condition" );
   _scan_only_prefix = scan_only_prefix;
 }
 
 void
 SurvRateGroup::record_surviving_words(int age_in_group, size_t surv_words) {
-  guarantee( 0 <= age_in_group && (size_t) age_in_group < _curr_length,
+  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" );
@@ -178,15 +188,15 @@
 
 void
 SurvRateGroup::all_surviving_words_recorded(bool propagate) {
-  if (propagate && _curr_length > 0) { // conservative
-    double surv_rate = _surv_rate_pred[_curr_length-1]->last();
+  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 = _curr_length; i < _array_length; ++i) {
+    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);
@@ -195,7 +205,7 @@
 
   double accum = 0.0;
   double pred = 0.0;
-  for (size_t i = 0; i < _array_length; ++i) {
+  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;
@@ -209,8 +219,8 @@
 void
 SurvRateGroup::print() {
   gclog_or_tty->print_cr("Surv Rate Group: %s (%d entries, %d scan-only)",
-                _name, _curr_length, _scan_only_prefix);
-  for (size_t i = 0; i < _curr_length; ++i) {
+                _name, _region_num, _scan_only_prefix);
+  for (size_t i = 0; i < _region_num; ++i) {
     gclog_or_tty->print_cr("    age %4d   surv rate %6.2lf %%   pred %6.2lf %%%s",
                   i, _surv_rate[i] * 100.0,
                   _g1p->get_new_prediction(_surv_rate_pred[i]) * 100.0,