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diff --git a/indra/llcommon/lltracerecording.h b/indra/llcommon/lltracerecording.h
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+/** 
+ * @file lltracerecording.h
+ * @brief Sampling object for collecting runtime statistics originating from lltrace.
+ *
+ * $LicenseInfo:firstyear=2001&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2012, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLTRACERECORDING_H
+#define LL_LLTRACERECORDING_H
+
+#include "stdtypes.h"
+#include "llpreprocessor.h"
+
+#include "llpointer.h"
+#include "lltimer.h"
+
+namespace LLTrace
+{
+	template<typename T> class Rate;
+	template<typename T> class Measurement;
+	template<typename T> class AccumulatorBuffer;
+	template<typename T> class RateAccumulator;
+	template<typename T> class MeasurementAccumulator;
+	class TimerAccumulator;
+
+	class LL_COMMON_API Recording
+	{
+	public:
+		Recording();
+
+		~Recording();
+
+		void makePrimary();
+		bool isPrimary();
+
+		void start();
+		void stop();
+		void resume();
+
+		void mergeSamples(const Recording& other);
+		void initDeltas(const Recording& other);
+		void mergeDeltas(const Recording& other);
+
+		void reset();
+
+		bool isStarted() { return mIsStarted; }
+
+		F32 getSum(Rate<F32>& stat);
+		F32 getPerSec(Rate<F32>& stat);
+
+		F32 getSum(Measurement<F32>& stat);
+		F32 getMin(Measurement<F32>& stat);
+		F32 getMax(Measurement<F32>& stat);
+		F32 getMean(Measurement<F32>& stat);
+		F32 getStandardDeviation(Measurement<F32>& stat);
+
+		F64 getSampleTime() { return mElapsedSeconds; }
+
+	private:
+		friend class ThreadRecorder;
+		// returns data for current thread
+		class ThreadRecorder* getThreadRecorder(); 
+
+		LLCopyOnWritePointer<AccumulatorBuffer<RateAccumulator<F32> > >			mRatesStart;
+		LLCopyOnWritePointer<AccumulatorBuffer<RateAccumulator<F32> > >			mRates;
+		LLCopyOnWritePointer<AccumulatorBuffer<MeasurementAccumulator<F32> > >	mMeasurements;
+		LLCopyOnWritePointer<AccumulatorBuffer<TimerAccumulator> >				mStackTimersStart;
+		LLCopyOnWritePointer<AccumulatorBuffer<TimerAccumulator> >				mStackTimers;
+
+		bool			mIsStarted;
+		LLTimer			mSamplingTimer;
+		F64				mElapsedSeconds;
+	};
+
+	class LL_COMMON_API PeriodicRecording
+	{
+
+	};
+}
+
+#endif // LL_LLTRACERECORDING_H