--- old/src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp	2011-08-16 14:07:02.969082600 +0200
+++ new/src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp	2011-08-16 14:07:02.547881800 +0200
@@ -201,7 +201,6 @@
 
   // </NEW PREDICTION>
 
-  _in_young_gc_mode(false),
   _full_young_gcs(true),
   _full_young_pause_num(0),
   _partial_young_pause_num(0),
@@ -468,27 +467,20 @@
 
   initialize_gc_policy_counters();
 
-  if (G1Gen) {
-    _in_young_gc_mode = true;
+  G1YoungGenSizer sizer;
+  size_t initial_region_num = sizer.initial_young_region_num();
 
-    G1YoungGenSizer sizer;
-    size_t initial_region_num = sizer.initial_young_region_num();
-
-    if (UseAdaptiveSizePolicy) {
-      set_adaptive_young_list_length(true);
-      _young_list_fixed_length = 0;
-    } else {
-      set_adaptive_young_list_length(false);
-      _young_list_fixed_length = initial_region_num;
-    }
-    _free_regions_at_end_of_collection = _g1->free_regions();
-    calculate_young_list_min_length();
-    guarantee( _young_list_min_length == 0, "invariant, not enough info" );
-    calculate_young_list_target_length();
+  if (UseAdaptiveSizePolicy) {
+    set_adaptive_young_list_length(true);
+    _young_list_fixed_length = 0;
   } else {
-     _young_list_fixed_length = 0;
-    _in_young_gc_mode = false;
+    set_adaptive_young_list_length(false);
+    _young_list_fixed_length = initial_region_num;
   }
+  _free_regions_at_end_of_collection = _g1->free_regions();
+  calculate_young_list_min_length();
+  guarantee( _young_list_min_length == 0, "invariant, not enough info" );
+  calculate_young_list_target_length();
 
   // We may immediately start allocating regions and placing them on the
   // collection set list. Initialize the per-collection set info
@@ -498,7 +490,7 @@
 // Create the jstat counters for the policy.
 void G1CollectorPolicy::initialize_gc_policy_counters()
 {
-  _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen);
+  _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3);
 }
 
 void G1CollectorPolicy::calculate_young_list_min_length() {
@@ -868,8 +860,7 @@
   if (PrintGCDetails) {
     gclog_or_tty->stamp(PrintGCTimeStamps);
     gclog_or_tty->print("[GC pause");
-    if (in_young_gc_mode())
-      gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial");
+    gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial");
   }
 
   assert(_g1->used() == _g1->recalculate_used(),
@@ -921,8 +912,7 @@
   _satb_drain_time_set = false;
   _last_satb_drain_processed_buffers = -1;
 
-  if (in_young_gc_mode())
-    _last_young_gc_full = false;
+  _last_young_gc_full = false;
 
   // do that for any other surv rate groups
   _short_lived_surv_rate_group->stop_adding_regions();
@@ -937,7 +927,6 @@
 
 void G1CollectorPolicy::record_concurrent_mark_init_start() {
   _mark_init_start_sec = os::elapsedTime();
-  guarantee(!in_young_gc_mode(), "should not do be here in young GC mode");
 }
 
 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double
@@ -1019,13 +1008,11 @@
 
 void
 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() {
-  if (in_young_gc_mode()) {
-    _should_revert_to_full_young_gcs = false;
-    _last_full_young_gc = true;
-    _in_marking_window = false;
-    if (adaptive_young_list_length())
-      calculate_young_list_target_length();
-  }
+  _should_revert_to_full_young_gcs = false;
+  _last_full_young_gc = true;
+  _in_marking_window = false;
+  if (adaptive_young_list_length())
+    calculate_young_list_target_length();
 }
 
 void G1CollectorPolicy::record_concurrent_pause() {
@@ -1174,31 +1161,29 @@
   }
 #endif // PRODUCT
 
-  if (in_young_gc_mode()) {
-    last_pause_included_initial_mark = during_initial_mark_pause();
-    if (last_pause_included_initial_mark)
-      record_concurrent_mark_init_end_pre(0.0);
-
-    size_t min_used_targ =
-      (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent;
+  last_pause_included_initial_mark = during_initial_mark_pause();
+  if (last_pause_included_initial_mark)
+    record_concurrent_mark_init_end_pre(0.0);
+
+  size_t min_used_targ =
+    (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent;
 
 
-    if (!_g1->mark_in_progress() && !_last_full_young_gc) {
-      assert(!last_pause_included_initial_mark, "invariant");
-      if (cur_used_bytes > min_used_targ &&
-          cur_used_bytes > _prev_collection_pause_used_at_end_bytes) {
+  if (!_g1->mark_in_progress() && !_last_full_young_gc) {
+    assert(!last_pause_included_initial_mark, "invariant");
+    if (cur_used_bytes > min_used_targ &&
+      cur_used_bytes > _prev_collection_pause_used_at_end_bytes) {
         assert(!during_initial_mark_pause(), "we should not see this here");
 
         // Note: this might have already been set, if during the last
         // pause we decided to start a cycle but at the beginning of
         // this pause we decided to postpone it. That's OK.
         set_initiate_conc_mark_if_possible();
-      }
     }
-
-    _prev_collection_pause_used_at_end_bytes = cur_used_bytes;
   }
 
+  _prev_collection_pause_used_at_end_bytes = cur_used_bytes;
+
   _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0,
                           end_time_sec, false);
 
@@ -1468,24 +1453,23 @@
     new_in_marking_window_im = true;
   }
 
-  if (in_young_gc_mode()) {
-    if (_last_full_young_gc) {
-      set_full_young_gcs(false);
-      _last_full_young_gc = false;
-    }
+  if (_last_full_young_gc) {
+    set_full_young_gcs(false);
+    _last_full_young_gc = false;
+  }
 
-    if ( !_last_young_gc_full ) {
-      if ( _should_revert_to_full_young_gcs ||
-           _known_garbage_ratio < 0.05 ||
-           (adaptive_young_list_length() &&
-           (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) {
+  if ( !_last_young_gc_full ) {
+    if ( _should_revert_to_full_young_gcs ||
+      _known_garbage_ratio < 0.05 ||
+      (adaptive_young_list_length() &&
+      (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) {
         set_full_young_gcs(true);
-      }
     }
-    _should_revert_to_full_young_gcs = false;
+  }
+  _should_revert_to_full_young_gcs = false;
 
-    if (_last_young_gc_full && !_during_marking)
-      _young_gc_eff_seq->add(cur_efficiency);
+  if (_last_young_gc_full && !_during_marking) {
+    _young_gc_eff_seq->add(cur_efficiency);
   }
 
   _short_lived_surv_rate_group->start_adding_regions();
@@ -1910,18 +1894,8 @@
   // I don't think we need to do this when in young GC mode since
   // marking will be initiated next time we hit the soft limit anyway...
   if (predicted_time_ms > _expensive_region_limit_ms) {
-    if (!in_young_gc_mode()) {
-        set_full_young_gcs(true);
-        // We might want to do something different here. However,
-        // right now we don't support the non-generational G1 mode
-        // (and in fact we are planning to remove the associated code,
-        // see CR 6814390). So, let's leave it as is and this will be
-        // removed some time in the future
-        ShouldNotReachHere();
-        set_during_initial_mark_pause();
-    } else
-      // no point in doing another partial one
-      _should_revert_to_full_young_gcs = true;
+    // no point in doing another partial one
+    _should_revert_to_full_young_gcs = true;
   }
 }
 
@@ -2617,9 +2591,7 @@
   _inc_cset_size = 0;
   _inc_cset_bytes_used_before = 0;
 
-  if (in_young_gc_mode()) {
-    _inc_cset_young_index = 0;
-  }
+  _inc_cset_young_index = 0;
 
   _inc_cset_max_finger = 0;
   _inc_cset_recorded_young_bytes = 0;
@@ -2848,86 +2820,84 @@
   max_live_bytes = max_live_bytes + expansion_bytes;
 
   HeapRegion* hr;
-  if (in_young_gc_mode()) {
-    double young_start_time_sec = os::elapsedTime();
+  double young_start_time_sec = os::elapsedTime();
 
-    if (G1PolicyVerbose > 0) {
-      gclog_or_tty->print_cr("Adding %d young regions to the CSet",
-                    _g1->young_list()->length());
-    }
+  if (G1PolicyVerbose > 0) {
+    gclog_or_tty->print_cr("Adding %d young regions to the CSet",
+      _g1->young_list()->length());
+  }
 
-    _young_cset_length  = 0;
-    _last_young_gc_full = full_young_gcs() ? true : false;
+  _young_cset_length  = 0;
+  _last_young_gc_full = full_young_gcs() ? true : false;
 
-    if (_last_young_gc_full)
-      ++_full_young_pause_num;
-    else
-      ++_partial_young_pause_num;
+  if (_last_young_gc_full)
+    ++_full_young_pause_num;
+  else
+    ++_partial_young_pause_num;
+
+  // The young list is laid with the survivor regions from the previous
+  // pause are appended to the RHS of the young list, i.e.
+  //   [Newly Young Regions ++ Survivors from last pause].
+
+  hr = _g1->young_list()->first_survivor_region();
+  while (hr != NULL) {
+    assert(hr->is_survivor(), "badly formed young list");
+    hr->set_young();
+    hr = hr->get_next_young_region();
+  }
+
+  // Clear the fields that point to the survivor list - they are
+  // all young now.
+  _g1->young_list()->clear_survivors();
+
+  if (_g1->mark_in_progress())
+    _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger);
 
-    // The young list is laid with the survivor regions from the previous
-    // pause are appended to the RHS of the young list, i.e.
-    //   [Newly Young Regions ++ Survivors from last pause].
-
-    hr = _g1->young_list()->first_survivor_region();
-    while (hr != NULL) {
-      assert(hr->is_survivor(), "badly formed young list");
-      hr->set_young();
-      hr = hr->get_next_young_region();
-    }
-
-    // Clear the fields that point to the survivor list - they are
-    // all young now.
-    _g1->young_list()->clear_survivors();
-
-    if (_g1->mark_in_progress())
-      _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger);
-
-    _young_cset_length = _inc_cset_young_index;
-    _collection_set = _inc_cset_head;
-    _collection_set_size = _inc_cset_size;
-    _collection_set_bytes_used_before = _inc_cset_bytes_used_before;
-
-    // For young regions in the collection set, we assume the worst
-    // case of complete survival
-    max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes;
-
-    time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms;
-    predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms;
-
-    // The number of recorded young regions is the incremental
-    // collection set's current size
-    set_recorded_young_regions(_inc_cset_size);
-    set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths);
-    set_recorded_young_bytes(_inc_cset_recorded_young_bytes);
+  _young_cset_length = _inc_cset_young_index;
+  _collection_set = _inc_cset_head;
+  _collection_set_size = _inc_cset_size;
+  _collection_set_bytes_used_before = _inc_cset_bytes_used_before;
+
+  // For young regions in the collection set, we assume the worst
+  // case of complete survival
+  max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes;
+
+  time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms;
+  predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms;
+
+  // The number of recorded young regions is the incremental
+  // collection set's current size
+  set_recorded_young_regions(_inc_cset_size);
+  set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths);
+  set_recorded_young_bytes(_inc_cset_recorded_young_bytes);
 #if PREDICTIONS_VERBOSE
-    set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy);
+  set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy);
 #endif // PREDICTIONS_VERBOSE
 
-    if (G1PolicyVerbose > 0) {
-      gclog_or_tty->print_cr("  Added " PTR_FORMAT " Young Regions to CS.",
-                             _inc_cset_size);
-      gclog_or_tty->print_cr("    (" SIZE_FORMAT " KB left in heap.)",
-                            max_live_bytes/K);
-    }
+  if (G1PolicyVerbose > 0) {
+    gclog_or_tty->print_cr("  Added " PTR_FORMAT " Young Regions to CS.",
+      _inc_cset_size);
+    gclog_or_tty->print_cr("    (" SIZE_FORMAT " KB left in heap.)",
+      max_live_bytes/K);
+  }
 
-    assert(_inc_cset_size == _g1->young_list()->length(), "Invariant");
+  assert(_inc_cset_size == _g1->young_list()->length(), "Invariant");
 
-    double young_end_time_sec = os::elapsedTime();
-    _recorded_young_cset_choice_time_ms =
-      (young_end_time_sec - young_start_time_sec) * 1000.0;
+  double young_end_time_sec = os::elapsedTime();
+  _recorded_young_cset_choice_time_ms =
+    (young_end_time_sec - young_start_time_sec) * 1000.0;
 
-    // We are doing young collections so reset this.
-    non_young_start_time_sec = young_end_time_sec;
+  // We are doing young collections so reset this.
+  non_young_start_time_sec = young_end_time_sec;
 
-    // Note we can use either _collection_set_size or
-    // _young_cset_length here
-    if (_collection_set_size > 0 && _last_young_gc_full) {
-      // don't bother adding more regions...
-      goto choose_collection_set_end;
-    }
+  // Note we can use either _collection_set_size or
+  // _young_cset_length here
+  if (_collection_set_size > 0 && _last_young_gc_full) {
+    // don't bother adding more regions...
+    goto choose_collection_set_end;
   }
 
-  if (!in_young_gc_mode() || !full_young_gcs()) {
+  if (!full_young_gcs()) {
     bool should_continue = true;
     NumberSeq seq;
     double avg_prediction = 100000000000000000.0; // something very large