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diff --git a/indra/llcommon/lltracesampler.h b/indra/llcommon/lltracesampler.h
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+/** 
+ * @file lltracesampler.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_LLTRACESAMPLER_H
+#define LL_LLTRACESAMPLER_H
+
+#include "stdtypes.h"
+#include "llpreprocessor.h"
+
+#include "lltrace.h"
+
+namespace LLTrace
+{
+	class LL_COMMON_API Sampler
+	{
+	public:
+		~Sampler();
+
+		void makePrimary();
+
+		void start();
+		void stop();
+		void resume();
+
+		void mergeFrom(const Sampler* other);
+
+		void reset();
+
+		bool isStarted() { return mIsStarted; }
+
+		F32 getSum(Stat<F32>& stat) { return stat.getAccumulator(mF32Stats).getSum(); }
+		F32 getMin(Stat<F32>& stat) { return stat.getAccumulator(mF32Stats).getMin(); }
+		F32 getMax(Stat<F32>& stat) { return stat.getAccumulator(mF32Stats).getMax(); }
+		F32 getMean(Stat<F32>& stat) { return stat.getAccumulator(mF32Stats).getMean(); }
+
+		S32 getSum(Stat<S32>& stat) { return stat.getAccumulator(mS32Stats).getSum(); }
+		S32 getMin(Stat<S32>& stat) { return stat.getAccumulator(mS32Stats).getMin(); }
+		S32 getMax(Stat<S32>& stat) { return stat.getAccumulator(mS32Stats).getMax(); }
+		S32 getMean(Stat<S32>& stat) { return stat.getAccumulator(mS32Stats).getMean(); }
+
+		F64 getSampleTime() { return mElapsedSeconds; }
+
+	private:
+		friend class ThreadTrace;
+		Sampler(class ThreadTrace* thread_trace);
+
+		// no copy
+		Sampler(const Sampler& other) {}
+		// returns data for current thread
+		class ThreadTrace* getThreadTrace(); 
+
+		//TODO: take snapshot at sampler start so we can simplify updates
+		//AccumulatorBuffer<StatAccumulator<F32> >	mF32StatsStart;
+		//AccumulatorBuffer<StatAccumulator<S32> >	mS32StatsStart;
+		//AccumulatorBuffer<TimerAccumulator>			mStackTimersStart;
+
+		AccumulatorBuffer<StatAccumulator<F32> >	mF32Stats;
+		AccumulatorBuffer<StatAccumulator<S32> >	mS32Stats;
+		AccumulatorBuffer<TimerAccumulator>			mStackTimers;
+
+		bool										mIsStarted;
+		LLTimer										mSamplingTimer;
+		F64											mElapsedSeconds;
+		ThreadTrace*								mThreadTrace;
+	};
+}
+
+#endif // LL_LLTRACESAMPLER_H