diff -r fde3feaaa4ed -r 7194eb9e8f19 src/hotspot/share/services/virtualMemoryTracker.hpp
--- a/src/hotspot/share/services/virtualMemoryTracker.hpp	Tue Mar 06 17:15:16 2018 -0500
+++ b/src/hotspot/share/services/virtualMemoryTracker.hpp	Tue Mar 06 17:45:31 2018 -0500
@@ -160,7 +160,9 @@
     as_snapshot()->by_type(to)->commit_memory(size);
   }
 
-  static void snapshot(VirtualMemorySnapshot* s);
+  static inline void snapshot(VirtualMemorySnapshot* s) {
+    as_snapshot()->copy_to(s);
+  }
 
   static VirtualMemorySnapshot* as_snapshot() {
     return (VirtualMemorySnapshot*)_snapshot;
@@ -334,9 +336,6 @@
     return compare(rgn) == 0;
   }
 
-  // uncommitted thread stack bottom, above guard pages if there is any.
-  address thread_stack_uncommitted_bottom() const;
-
   bool    add_committed_region(address addr, size_t size, const NativeCallStack& stack);
   bool    remove_uncommitted_region(address addr, size_t size);
 
@@ -390,7 +389,6 @@
 // Main class called from MemTracker to track virtual memory allocations, commits and releases.
 class VirtualMemoryTracker : AllStatic {
   friend class VirtualMemoryTrackerTest;
-  friend class ThreadStackTrackingTest;
 
  public:
   static bool initialize(NMT_TrackingLevel level);
@@ -410,9 +408,6 @@
 
   static bool transition(NMT_TrackingLevel from, NMT_TrackingLevel to);
 
-  // Snapshot current thread stacks
-  static void snapshot_thread_stacks();
-
  private:
   static SortedLinkedList<ReservedMemoryRegion, compare_reserved_region_base>* _reserved_regions;
 };