diff --git a/src/hotspot/share/gc/serial/serialHeap.cpp b/src/hotspot/share/gc/serial/serialHeap.cpp
index 104924c1cad..08d730bf877 100644
--- a/src/hotspot/share/gc/serial/serialHeap.cpp
+++ b/src/hotspot/share/gc/serial/serialHeap.cpp
@@ -91,14 +91,16 @@ SerialHeap::SerialHeap() :
     CollectedHeap(),
     _young_gen(nullptr),
     _old_gen(nullptr),
+    _young_gen_saved_top(nullptr),
+    _old_gen_saved_top(nullptr),
     _rem_set(nullptr),
     _gc_policy_counters(new GCPolicyCounters("Copy:MSC", 2, 2)),
     _young_manager(nullptr),
     _old_manager(nullptr),
-    _is_heap_almost_full(false),
     _eden_pool(nullptr),
     _survivor_pool(nullptr),
-    _old_pool(nullptr) {
+    _old_pool(nullptr),
+    _is_heap_almost_full(false) {
   _young_manager = new GCMemoryManager("Copy");
   _old_manager = new GCMemoryManager("MarkSweepCompact");
   GCLocker::initialize();
diff --git a/src/hotspot/share/gc/serial/serialHeap.hpp b/src/hotspot/share/gc/serial/serialHeap.hpp
index f5286179abf..36916c3f98e 100644
--- a/src/hotspot/share/gc/serial/serialHeap.hpp
+++ b/src/hotspot/share/gc/serial/serialHeap.hpp
@@ -76,6 +76,8 @@ class SerialHeap : public CollectedHeap {
 private:
   DefNewGeneration* _young_gen;
   TenuredGeneration* _old_gen;
+
+  // Used during young-gc
   HeapWord* _young_gen_saved_top;
   HeapWord* _old_gen_saved_top;
 
@@ -94,6 +96,10 @@ private:
   GCMemoryManager* _young_manager;
   GCMemoryManager* _old_manager;
 
+  MemoryPool* _eden_pool;
+  MemoryPool* _survivor_pool;
+  MemoryPool* _old_pool;
+
   // Indicate whether heap is almost or approaching full.
   // Usually, there is some memory headroom for application/gc to run properly.
   // However, in extreme cases, e.g. young-gen is non-empty after a full gc, we
@@ -113,6 +119,19 @@ private:
 
   static void verify_not_in_native_if_java_thread() NOT_DEBUG_RETURN;
 
+  // Try to allocate space by expanding the heap.
+  HeapWord* expand_heap_and_allocate(size_t size, bool is_tlab);
+
+  HeapWord* mem_allocate_cas_noexpand(size_t size, bool is_tlab);
+  HeapWord* mem_allocate_work(size_t size, bool is_tlab);
+
+  void initialize_serviceability() override;
+
+  // Set the saved marks of generations, if that makes sense.
+  // In particular, if any generation might iterate over the oops
+  // in other generations, it should call this method.
+  void save_marks();
+
 public:
   // Returns JNI_OK on success
   jint initialize() override;
@@ -211,26 +230,6 @@ public:
   // generations in a fully generational heap.
   CardTableRS* rem_set() { return _rem_set; }
 
- public:
-  // Set the saved marks of generations, if that makes sense.
-  // In particular, if any generation might iterate over the oops
-  // in other generations, it should call this method.
-  void save_marks();
-
-private:
-  // Try to allocate space by expanding the heap.
-  HeapWord* expand_heap_and_allocate(size_t size, bool is_tlab);
-
-  HeapWord* mem_allocate_cas_noexpand(size_t size, bool is_tlab);
-  HeapWord* mem_allocate_work(size_t size, bool is_tlab);
-
-  MemoryPool* _eden_pool;
-  MemoryPool* _survivor_pool;
-  MemoryPool* _old_pool;
-
-  void initialize_serviceability() override;
-
-public:
   static SerialHeap* heap();
 
   SerialHeap();