no need to set_mutator_free_after_updaterefs

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

@@ -2590,12 +2590,12 @@ void ShenandoahFreeSet::prepare_to_rebuild(size_t &young_trashed_regions, size_t
 }
 
 // Return mutator free
-size_t ShenandoahFreeSet::finish_rebuild(size_t young_trashed_regions, size_t old_trashed_regions, size_t old_region_count) {
+void ShenandoahFreeSet::finish_rebuild(size_t young_trashed_regions, size_t old_trashed_regions, size_t old_region_count) {
   shenandoah_assert_heaplocked();
   size_t young_reserve(0), old_reserve(0);
 
   if (_heap->mode()->is_generational()) {
-    compute_young_and_old_reserves(young_cset_regions, old_cset_regions, young_reserve, old_reserve);
+    compute_young_and_old_reserves(young_trashed_regions, old_trashed_regions, young_reserve, old_reserve);
   } else {
     young_reserve = (_heap->max_capacity() / 100) * ShenandoahEvacReserve;
     old_reserve = 0;
@@ -2604,8 +2604,8 @@ size_t ShenandoahFreeSet::finish_rebuild(size_t young_trashed_regions, size_t ol
   // Move some of the mutator regions into the Collector and OldCollector partitions in order to satisfy
   // young_reserve and old_reserve.
   size_t young_used_regions, old_used_regions, young_used_bytes, old_used_bytes;
-  size_t mutator_free = reserve_regions(young_reserve, old_reserve, old_region_count, young_used_regions, old_used_regions,
+  reserve_regions(young_reserve, old_reserve, old_region_count, young_used_regions, old_used_regions,
-                                        young_used_bytes, old_used_bytes);
+                  young_used_bytes, old_used_bytes);
   _total_young_regions = _heap->num_regions() - old_region_count;
   _total_global_regions = _heap->num_regions();
   establish_old_collector_alloc_bias();
@@ -2618,7 +2618,6 @@ size_t ShenandoahFreeSet::finish_rebuild(size_t young_trashed_regions, size_t ol
     // Clear the region balance until it is adjusted in preparation for a subsequent GC cycle.
     _heap->old_generation()->set_region_balance(0);
   }
-  return mutator_free;
 }
 
 

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

@@ -802,9 +802,7 @@ public:
   //   old_trashed_regions is the number of trashed regions
   //                       (immediate garbage at final old mark, cset regions after update refs for mixed evac)
   //    num_old_regions is the number of old-gen regions that have available memory for further allocations (excluding old cset)
-  //
+  void finish_rebuild(size_t young_trashed_regions, size_t old_trashed_regions, size_t num_old_regions);
-  // Returns allocatable memory within Mutator partition, in words.
-  size_t finish_rebuild(size_t young_trashed_regions, size_t old_trashed_regions, size_t num_old_regions);
 
   // When a region is promoted in place, we add the region's available memory if it is greater than plab_min_size()
   // into the old collector partition by invoking this method.

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

@@ -1125,8 +1125,7 @@ void ShenandoahFullGC::phase5_epilog() {
       if (heap->mode()->is_generational()) {
         ShenandoahGenerationalFullGC::compute_balances();
       }
-      size_t mutator_free = heap->free_set()->finish_rebuild(young_trashed_regions, old_trashed_regions, num_old);
+      heap->free_set()->finish_rebuild(young_trashed_regions, old_trashed_regions, num_old);
-      heap->set_mutator_free_after_updaterefs(mutator_free);
     }
 
     // Set mark incomplete because the marking bitmaps have been reset except pinned regions.

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

@@ -684,7 +684,6 @@ protected:
   inline HeapWord* allocate_from_gclab(Thread* thread, size_t size);
 
 private:
-  size_t _mutator_free_after_updaterefs;
   HeapWord* allocate_memory_under_lock(ShenandoahAllocRequest& request, bool& in_new_region);
   HeapWord* allocate_from_gclab_slow(Thread* thread, size_t size);
   HeapWord* allocate_new_gclab(size_t min_size, size_t word_size, size_t* actual_size);
@@ -711,9 +710,6 @@ public:
   void tlabs_retire(bool resize);
   void gclabs_retire(bool resize);
 
-  inline void set_mutator_free_after_updaterefs(size_t val) { _mutator_free_after_updaterefs = val; };
-  inline size_t get_mutator_free_after_updaterefs() const   { return _mutator_free_after_updaterefs; };
-
 // ---------- Marking support
 //
 private: