diff --git a/src/coreclr/gc/gc.cpp b/src/coreclr/gc/gc.cpp
index 58b645ffd67e7f..bf7d5a07c12b21 100644
--- a/src/coreclr/gc/gc.cpp
+++ b/src/coreclr/gc/gc.cpp
@@ -2336,9 +2336,6 @@ size_t      gc_heap::heap_hard_limit_oh[total_oh_count];
 
 size_t      gc_heap::regions_range = 0;
 
-size_t      gc_heap::heap_hard_limit_for_heap = 0;
-size_t      gc_heap::heap_hard_limit_for_bookkeeping = 0;
-
 #endif //USE_REGIONS
 
 bool        affinity_config_specified_p = false;
@@ -6956,10 +6953,6 @@ bool gc_heap::virtual_commit (void* address, size_t size, int bucket, int h_numb
 
         if (heap_hard_limit_oh[soh] != 0)
         {
-#ifdef USE_REGIONS
-            assert (heap_hard_limit_for_heap == 0);
-            assert (heap_hard_limit_for_bookkeeping == 0);
-#endif //USE_REGIONS
             if ((bucket < total_oh_count) && (committed_by_oh[bucket] + size) > heap_hard_limit_oh[bucket])
             {
                 exceeded_p = true;
@@ -6967,23 +6960,9 @@ bool gc_heap::virtual_commit (void* address, size_t size, int bucket, int h_numb
         }
         else
         {
-            size_t base;
-            size_t limit;
-#ifdef USE_REGIONS
-            if (h_number < 0)
-            {
-                base = current_total_committed_bookkeeping;
-                limit = heap_hard_limit_for_bookkeeping;
-            }
-            else
-            {
-                base = current_total_committed - current_total_committed_bookkeeping;
-                limit = heap_hard_limit_for_heap;
-            }
-#else
-            base = current_total_committed;
-            limit = heap_hard_limit;
-#endif //USE_REGIONS
+            size_t base = current_total_committed;
+            size_t limit = heap_hard_limit;
+
             if ((base + size) > limit)
             {
                 dprintf (1, ("%zd + %zd = %zd > limit %zd ", base, size, (base + size), limit));
@@ -11339,12 +11318,6 @@ void gc_heap::clear_region_info (heap_segment* region)
                         seg_deleted);
 
     bgc_verify_mark_array_cleared (region);
-
-    if (dt_high_memory_load_p())
-    {
-        decommit_mark_array_by_seg (region);
-        region->flags &= ~(heap_segment_flags_ma_committed);
-    }
 #endif //BACKGROUND_GC
 }
 
@@ -13671,26 +13644,6 @@ HRESULT gc_heap::initialize_gc (size_t soh_segment_size,
 #endif //BACKGROUND_GC
 #endif //WRITE_WATCH
 
-#ifdef USE_REGIONS
-    if (gc_heap::heap_hard_limit && gc_heap::heap_hard_limit_oh[soh] == 0)
-    {
-        size_t gc_region_size = (size_t)1 << min_segment_size_shr;
-        size_t sizes[total_bookkeeping_elements];
-        size_t bookkeeping_size_per_region = 0;
-        uint8_t* temp_lowest_address = (uint8_t*)gc_region_size;
-        gc_heap::get_card_table_element_sizes(temp_lowest_address, temp_lowest_address + gc_region_size, sizes);
-        for (int i = 0; i < total_bookkeeping_elements; i++)
-        {
-            bookkeeping_size_per_region += sizes[i];
-        }
-        size_t total_size_per_region = gc_region_size + bookkeeping_size_per_region;
-        size_t max_region_count = gc_heap::heap_hard_limit / total_size_per_region; // implictly rounded down
-        gc_heap::heap_hard_limit_for_heap = max_region_count * gc_region_size;
-        gc_heap::heap_hard_limit_for_bookkeeping = max_region_count * bookkeeping_size_per_region;
-        dprintf (REGIONS_LOG, ("bookkeeping_size_per_region = %zd", bookkeeping_size_per_region));
-    }
-#endif //USE_REGIONS
-
 #ifdef BACKGROUND_GC
     // leave the first page to contain only segment info
     // because otherwise we could need to revisit the first page frequently in
@@ -14450,6 +14403,8 @@ gc_heap::init_gc_heap (int h_number)
 #endif //CARD_BUNDLE
 
 #ifdef BACKGROUND_GC
+    background_saved_highest_address = nullptr;
+    background_saved_lowest_address = nullptr;
     if (gc_can_use_concurrent)
         mark_array = translate_mark_array (card_table_mark_array (&g_gc_card_table[card_word (card_of (g_gc_lowest_address))]));
     else
@@ -20370,20 +20325,17 @@ bool gc_heap::try_get_new_free_region()
 bool gc_heap::init_table_for_region (int gen_number, heap_segment* region)
 {
 #ifdef BACKGROUND_GC
-        if (is_bgc_in_progress())
+        dprintf (GC_TABLE_LOG, ("new seg %Ix, mark_array is %Ix",
+            heap_segment_mem (region), mark_array));
+        if (((region->flags & heap_segment_flags_ma_committed) == 0) &&
+            !commit_mark_array_new_seg (__this, region))
         {
-            dprintf (GC_TABLE_LOG, ("new seg %p, mark_array is %p",
-                heap_segment_mem (region), mark_array));
-            if (((region->flags & heap_segment_flags_ma_committed) == 0) &&
-                !commit_mark_array_new_seg (__this, region))
-            {
-                dprintf (GC_TABLE_LOG, ("failed to commit mark array for the new region %p-%p",
-                    get_region_start (region), heap_segment_reserved (region)));
+            dprintf (GC_TABLE_LOG, ("failed to commit mark array for the new region %Ix-%Ix",
+                get_region_start (region), heap_segment_reserved (region)));
 
-                // We don't have memory to commit the mark array so we cannot use the new region.
-                global_region_allocator.delete_region (get_region_start (region));
-                return false;
-            }
+            // We don't have memory to commit the mark array so we cannot use the new region.
+            global_region_allocator.delete_region (get_region_start (region));
+            return false;
         }
         if ((region->flags & heap_segment_flags_ma_committed) != 0)
         {
diff --git a/src/coreclr/gc/gcpriv.h b/src/coreclr/gc/gcpriv.h
index 599a5b86908492..6514729366da23 100644
--- a/src/coreclr/gc/gcpriv.h
+++ b/src/coreclr/gc/gcpriv.h
@@ -4115,12 +4115,6 @@ class gc_heap
     PER_HEAP_ISOLATED
     size_t heap_hard_limit_oh[total_oh_count];
 
-    PER_HEAP_ISOLATED
-    size_t heap_hard_limit_for_heap;
-
-    PER_HEAP_ISOLATED
-    size_t heap_hard_limit_for_bookkeeping;
-
     PER_HEAP_ISOLATED
     CLRCriticalSection check_commit_cs;