--- old/src/share/vm/runtime/mutexLocker.hpp	2015-03-26 15:13:39.035041311 -0700
+++ new/src/share/vm/runtime/mutexLocker.hpp	2015-03-26 15:13:38.894034278 -0700
@@ -55,6 +55,7 @@
 extern Mutex*   StringDedupTable_lock;           // a lock on the string deduplication table
 extern Monitor* CodeCache_lock;                  // a lock on the CodeCache, rank is special, use MutexLockerEx
 extern Mutex*   MethodData_lock;                 // a lock on installation of method data
+extern Mutex*   MethodUsage_lock;                // a lock on allocation of TraceMethodUsage info
 extern Mutex*   RetData_lock;                    // a lock on installation of RetData inside method data
 extern Mutex*   DerivedPointerTableGC_lock;      // a lock to protect the derived pointer table
 extern Monitor* VMOperationQueue_lock;           // a lock on queue of vm_operations waiting to execute