8211388: Make OtherRegionsTable independent of the region it is for

Reviewed-by: sjohanss, sangheki

src/hotspot/share/gc/g1/heapRegionRemSet.cpp

@@ -239,10 +239,9 @@ size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0;
 size_t OtherRegionsTable::_fine_eviction_stride = 0;
 size_t OtherRegionsTable::_fine_eviction_sample_size = 0;
 
-OtherRegionsTable::OtherRegionsTable(HeapRegion* hr, Mutex* m) :
+OtherRegionsTable::OtherRegionsTable(Mutex* m) :
   _g1h(G1CollectedHeap::heap()),
   _m(m),
-  _hr(hr),
   _coarse_map(G1CollectedHeap::heap()->max_regions(), mtGC),
   _n_coarse_entries(0),
   _fine_grain_regions(NULL),
@@ -250,7 +249,7 @@ OtherRegionsTable::OtherRegionsTable(HeapRegion* hr, Mutex* m) :
   _first_all_fine_prts(NULL),
   _last_all_fine_prts(NULL),
   _fine_eviction_start(0),
-  _sparse_table(hr)
+  _sparse_table()
 {
   typedef PerRegionTable* PerRegionTablePtr;
 
@@ -348,15 +347,6 @@ CardIdx_t OtherRegionsTable::card_within_region(OopOrNarrowOopStar within_region
 }
 
 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, uint tid) {
-  uint cur_hrm_ind = _hr->hrm_index();
-
-  uintptr_t from_card = uintptr_t(from) >> CardTable::card_shift;
-
-  if (G1FromCardCache::contains_or_replace(tid, cur_hrm_ind, from_card)) {
-    assert(contains_reference(from), "We just found " PTR_FORMAT " in the FromCardCache", p2i(from));
-    return;
-  }
-
   // Note that this may be a continued H region.
   HeapRegion* from_hr = _g1h->heap_region_containing(from);
   RegionIdx_t from_hrm_ind = (RegionIdx_t) from_hr->hrm_index();
@@ -569,10 +559,6 @@ size_t OtherRegionsTable::fl_mem_size() {
   return PerRegionTable::fl_mem_size();
 }
 
-void OtherRegionsTable::clear_fcc() {
-  G1FromCardCache::clear(_hr->hrm_index());
-}
-
 void OtherRegionsTable::clear() {
   // if there are no entries, skip this step
   if (_first_all_fine_prts != NULL) {
@@ -590,8 +576,6 @@ void OtherRegionsTable::clear() {
   }
   _n_fine_entries = 0;
   _n_coarse_entries = 0;
-
-  clear_fcc();
 }
 
 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const {
@@ -627,11 +611,16 @@ HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetTable* bot,
   : _bot(bot),
     _code_roots(),
     _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #%u", hr->hrm_index()), true, Monitor::_safepoint_check_never),
-    _other_regions(hr, &_m),
+    _other_regions(&_m),
+    _hr(hr),
     _state(Untracked)
 {
 }
 
+void HeapRegionRemSet::clear_fcc() {
+  G1FromCardCache::clear(_hr->hrm_index());
+}
+
 void HeapRegionRemSet::setup_remset_size() {
   // Setup sparse and fine-grain tables sizes.
   // table_size = base * (log(region_size / 1M) + 1)
@@ -659,6 +648,7 @@ void HeapRegionRemSet::clear_locked(bool only_cardset) {
   if (!only_cardset) {
     _code_roots.clear();
   }
+  clear_fcc();
   _other_regions.clear();
   set_state_empty();
   assert(occupied_locked() == 0, "Should be clear.");

src/hotspot/share/gc/g1/heapRegionRemSet.hpp

@@ -76,7 +76,6 @@ class OtherRegionsTable {
 
   G1CollectedHeap* _g1h;
   Mutex*           _m;
-  HeapRegion*      _hr;
 
   // These are protected by "_m".
   CHeapBitMap _coarse_map;
@@ -124,11 +123,8 @@ class OtherRegionsTable {
   bool contains_reference_locked(OopOrNarrowOopStar from) const;
 
 public:
-  // Clear the from_card_cache entries for this region.
-  void clear_fcc();
-  // Create a new remembered set for the given heap region. The given mutex should
-  // be used to ensure consistency.
-  OtherRegionsTable(HeapRegion* hr, Mutex* m);
+  // Create a new remembered set. The given mutex is used to ensure consistency.
+  OtherRegionsTable(Mutex* m);
 
   // Returns the card index of the given within_region pointer relative to the bottom
   // of the given heap region.
@@ -182,6 +178,10 @@ private:
 
   OtherRegionsTable _other_regions;
 
+  HeapRegion* _hr;
+
+  void clear_fcc();
+
 public:
   HeapRegionRemSet(G1BlockOffsetTable* bot, HeapRegion* hr);
 
@@ -243,18 +243,18 @@ public:
     if (_state == Untracked) {
       return;
     }
-    _other_regions.clear_fcc();
+    clear_fcc();
     _state = Untracked;
   }
 
   void set_state_updating() {
     guarantee(SafepointSynchronize::is_at_safepoint() && !is_tracked(), "Should only set to Updating from Untracked during safepoint but is %s", get_state_str());
-    _other_regions.clear_fcc();
+    clear_fcc();
     _state = Updating;
   }
 
   void set_state_complete() {
-    _other_regions.clear_fcc();
+    clear_fcc();
     _state = Complete;
   }
 
@@ -269,6 +269,15 @@ public:
     if (state == Untracked) {
       return;
     }
+
+    uint cur_idx = _hr->hrm_index();
+    uintptr_t from_card = uintptr_t(from) >> CardTable::card_shift;
+
+    if (G1FromCardCache::contains_or_replace(tid, cur_idx, from_card)) {
+      assert(contains_reference(from), "We just found " PTR_FORMAT " in the FromCardCache", p2i(from));
+      return;
+    }
+
     _other_regions.add_reference(from, tid);
   }
 

src/hotspot/share/gc/g1/sparsePRT.cpp

@@ -361,8 +361,8 @@ void SparsePRT::cleanup_all() {
 }
 
 
-SparsePRT::SparsePRT(HeapRegion* hr) :
-  _hr(hr), _expanded(false), _next_expanded(NULL)
+SparsePRT::SparsePRT() :
+  _expanded(false), _next_expanded(NULL)
 {
   _cur = new RSHashTable(InitialCapacity);
   _next = _cur;

src/hotspot/share/gc/g1/sparsePRT.hpp

@@ -231,8 +231,6 @@ class SparsePRT {
   RSHashTable* _cur;
   RSHashTable* _next;
 
-  HeapRegion* _hr;
-
   enum SomeAdditionalPrivateConstants {
     InitialCapacity = 16
   };
@@ -254,7 +252,7 @@ class SparsePRT {
   static SparsePRT* volatile _head_expanded_list;
 
 public:
-  SparsePRT(HeapRegion* hr);
+  SparsePRT();
 
   ~SparsePRT();