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diff --git a/src/trace.h b/src/trace.h
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+// Copyright (c) 2009-2013, Tor M. Aamodt, Timothy Rogers,
+// The University of British Columbia
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// Redistributions of source code must retain the above copyright notice, this
+// list of conditions and the following disclaimer.
+// Redistributions in binary form must reproduce the above copyright notice, this
+// list of conditions and the following disclaimer in the documentation and/or
+// other materials provided with the distribution.
+// Neither the name of The University of British Columbia nor the names of its
+// contributors may be used to endorse or promote products derived from this
+// software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// This file is inspired by the trace system in gem5.
+// This is a highly simplified version adpated for gpgpusim
+
+#ifndef __TRACE_H__
+#define __TRACE_H__
+
+extern unsigned long long  gpu_sim_cycle;
+extern unsigned long long  gpu_tot_sim_cycle;
+
+namespace Trace {
+
+#define TS_TUP_BEGIN(X) enum X {
+#define TS_TUP(X) X
+#define TS_TUP_END(X) };
+#include "trace_streams.tup"
+#undef TS_TUP_BEGIN
+#undef TS_TUP
+#undef TS_TUP_END
+
+    extern bool enabled;
+    extern int sampling_core;
+    extern const char* trace_streams_str[];
+    extern bool trace_streams_enabled[NUM_TRACE_STREAMS];
+    extern const char* config_str;
+
+    void init();
+
+} // namespace Trace
+
+
+#if TRACING_ON
+
+#define SIM_PRINT_STR "GPGPU-Sim Cycle %llu: %s - "
+#define DTRACE(x) ((Trace::trace_streams_enabled[Trace::x]) && Trace::enabled)
+#define DPRINTF(x, ...) do {\
+    if (DTRACE(x)) {\
+        printf( SIM_PRINT_STR,\
+                gpu_sim_cycle + gpu_tot_sim_cycle,\
+                Trace::trace_streams_str[Trace::x] );\
+        printf(__VA_ARGS__);\
+    }\
+} while (0)
+
+
+#else 
+
+#define DTRACE(x) (false)
+#define DPRINTF(x, ...) do {} while (0)
+
+#endif  
+
+#endif