8241841: Shenandoah: ditch one of allocation type counters in Shenand…

…oahHeapRegion

Reviewed-by: rkennke

src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.cpp

@@ -65,7 +65,6 @@ ShenandoahHeapRegion::ShenandoahHeapRegion(HeapWord* start, size_t index, bool c
   _top(start),
   _tlab_allocs(0),
   _gclab_allocs(0),
-  _shared_allocs(0),
   _seqnum_last_alloc_mutator(0),
   _live_data(0),
   _critical_pins(0),
@@ -315,15 +314,13 @@ void ShenandoahHeapRegion::clear_live_data() {
 void ShenandoahHeapRegion::reset_alloc_metadata() {
   _tlab_allocs = 0;
   _gclab_allocs = 0;
-  _shared_allocs = 0;
   _seqnum_last_alloc_mutator = 0;
 }
 
 void ShenandoahHeapRegion::reset_alloc_metadata_to_shared() {
   if (used() > 0) {
     _tlab_allocs = 0;
     _gclab_allocs = 0;
-    _shared_allocs = used() >> LogHeapWordSize;
     if (ShenandoahHeap::heap()->is_traversal_mode()) {
       update_seqnum_last_alloc_mutator();
     }
@@ -339,7 +336,7 @@ void ShenandoahHeapRegion::update_seqnum_last_alloc_mutator() {
 }
 
 size_t ShenandoahHeapRegion::get_shared_allocs() const {
-  return _shared_allocs * HeapWordSize;
+  return used() - (_tlab_allocs + _gclab_allocs) * HeapWordSize;
 }
 
 size_t ShenandoahHeapRegion::get_tlab_allocs() const {

src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.hpp

@@ -254,7 +254,6 @@ class ShenandoahHeapRegion : public CHeapObj<mtGC> {
 
   size_t _tlab_allocs;
   size_t _gclab_allocs;
-  size_t _shared_allocs;
 
   uint64_t _seqnum_last_alloc_mutator;
 

src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.inline.hpp

@@ -55,7 +55,7 @@ inline void ShenandoahHeapRegion::adjust_alloc_metadata(ShenandoahAllocRequest::
   switch (type) {
     case ShenandoahAllocRequest::_alloc_shared:
     case ShenandoahAllocRequest::_alloc_shared_gc:
-      _shared_allocs += size;
+      // Counted implicitly by tlab/gclab allocs
       break;
     case ShenandoahAllocRequest::_alloc_tlab:
       _tlab_allocs += size;