--- a/src/share/vm/runtime/thread.hpp	Thu Jan 26 14:14:55 2012 -0800
+++ b/src/share/vm/runtime/thread.hpp	Fri Jan 27 09:04:57 2012 +0100
@@ -41,6 +41,7 @@
 #include "runtime/stubRoutines.hpp"
 #include "runtime/threadLocalStorage.hpp"
 #include "runtime/unhandledOops.hpp"
+#include "trace/tracing.hpp"
 #include "utilities/exceptions.hpp"
 #include "utilities/top.hpp"
 #ifndef SERIALGC
@@ -246,6 +247,8 @@
   jlong _allocated_bytes;                       // Cumulative number of bytes allocated on
                                                 // the Java heap
 
+  TRACE_BUFFER _trace_buffer;                   // Thread-local buffer for tracing
+
   int   _vm_operation_started_count;            // VM_Operation support
   int   _vm_operation_completed_count;          // VM_Operation support
 
@@ -414,6 +417,9 @@
     return allocated_bytes;
   }
 
+  TRACE_BUFFER trace_buffer()              { return _trace_buffer; }
+  void set_trace_buffer(TRACE_BUFFER buf)  { _trace_buffer = buf; }
+
   // VM operation support
   int vm_operation_ticket()                      { return ++_vm_operation_started_count; }
   int vm_operation_completed_count()             { return _vm_operation_completed_count; }