diff -r 7e9ffb1fe1df -r 1572c9f03fb9 hotspot/src/os/windows/vm/os_windows.cpp
--- a/hotspot/src/os/windows/vm/os_windows.cpp	Tue Aug 05 14:18:44 2014 +0000
+++ b/hotspot/src/os/windows/vm/os_windows.cpp	Thu Aug 07 12:18:58 2014 -0700
@@ -138,9 +138,8 @@
       // Workaround for issue when a custom launcher doesn't call
       // DestroyJavaVM and NMT is trying to track memory when free is
       // called from a static destructor
-      if (MemTracker::is_on()) {
-          MemTracker::shutdown(MemTracker::NMT_normal);
-      }
+      MemTracker::shutdown();
+
       break;
     default:
       break;
@@ -163,6 +162,10 @@
  return result > 0 && result < len;
 }
 
+bool os::unsetenv(const char* name) {
+  assert(name != NULL, "Null pointer");
+  return (SetEnvironmentVariable(name, NULL) == TRUE);
+}
 
 // No setuid programs under Windows.
 bool os::have_special_privileges() {
@@ -319,15 +322,16 @@
  * So far, this method is only used by Native Memory Tracking, which is
  * only supported on Windows XP or later.
  */
-address os::get_caller_pc(int n) {
+int os::get_native_stack(address* stack, int frames, int toSkip) {
 #ifdef _NMT_NOINLINE_
-  n++;
+  toSkip ++;
 #endif
-  address pc;
-  if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) {
-    return pc;
-  }
-  return NULL;
+  int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
+    (PVOID*)stack, NULL);
+  for (int index = captured; index < frames; index ++) {
+    stack[index] = NULL;
+  }
+  return captured;
 }
 
 
@@ -2901,7 +2905,7 @@
                                 PAGE_READWRITE);
   // If reservation failed, return NULL
   if (p_buf == NULL) return NULL;
-  MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, mtNone, CALLER_PC);
+  MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
   os::release_memory(p_buf, bytes + chunk_size);
 
   // we still need to round up to a page boundary (in case we are using large pages)
@@ -2967,7 +2971,7 @@
         // need to create a dummy 'reserve' record to match
         // the release.
         MemTracker::record_virtual_memory_reserve((address)p_buf,
-          bytes_to_release, mtNone, CALLER_PC);
+          bytes_to_release, CALLER_PC);
         os::release_memory(p_buf, bytes_to_release);
       }
 #ifdef ASSERT
@@ -2986,11 +2990,10 @@
   }
   // Although the memory is allocated individually, it is returned as one.
   // NMT records it as one block.
-  address pc = CALLER_PC;
   if ((flags & MEM_COMMIT) != 0) {
-    MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, mtNone, pc);
+    MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
   } else {
-    MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, mtNone, pc);
+    MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
   }
 
   // made it this far, success
@@ -3188,8 +3191,7 @@
     DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
     char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
     if (res != NULL) {
-      address pc = CALLER_PC;
-      MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, mtNone, pc);
+      MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
     }
 
     return res;