--- old/src/share/vm/runtime/thread.hpp	2015-09-09 16:12:53.679861763 +0200
+++ new/src/share/vm/runtime/thread.hpp	2015-09-09 16:12:53.567861767 +0200
@@ -266,7 +266,6 @@
   ThreadLocalAllocBuffer _tlab;                 // Thread-local eden
   jlong _allocated_bytes;                       // Cumulative number of bytes allocated on
                                                 // the Java heap
-  uint _gc_id;                                  // The current GC id when a thread takes part in GC
 
   TRACE_DATA _trace_data;                       // Thread-local data for tracing
 
@@ -426,9 +425,6 @@
   void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
   inline jlong cooked_allocated_bytes();
 
-  void set_gc_id(uint gc_id) { _gc_id = gc_id; }
-  uint gc_id() { return _gc_id; }
-
   TRACE_DATA* trace_data()              { return &_trace_data; }
 
   const ThreadExt& ext() const          { return _ext; }