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diff --git a/indra/llcommon/llstat.h b/indra/llcommon/llstat.h
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+/** 
+ * @file llstat.h
+ * @brief Runtime statistics accumulation.
+ *
+ * Copyright (c) 2001-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LL_LLSTAT_H
+#define LL_LLSTAT_H
+
+#include <deque>
+
+#include "lltimer.h"
+#include "llframetimer.h"
+
+//
+// Accumulates statistics for an arbitrary length of time.
+// Does this by maintaining a chain of accumulators, each one
+// accumulation the results of the parent.  Can scale to arbitrary
+// amounts of time with very low memory cost.
+//
+
+class LLStatAccum
+{
+protected:
+	LLStatAccum(bool use_frame_timer);
+	virtual ~LLStatAccum();
+
+public:
+	enum TimeScale {
+		SCALE_SECOND,
+		SCALE_MINUTE,
+		SCALE_TWO_MINUTE,
+		SCALE_HOUR,
+		SCALE_DAY,
+		SCALE_WEEK,
+
+		NUM_SCALES
+	};
+
+	F32 meanValue(TimeScale scale) const;
+		// see the subclasses for the specific meaning of value
+
+	F32 meanValueOverLastSecond() const	{ return meanValue(SCALE_SECOND); }
+	F32 meanValueOverLastMinute() const	{ return meanValue(SCALE_MINUTE); }
+
+protected:
+	class impl;
+	impl& m;
+};
+
+class LLStatMeasure : public LLStatAccum
+	// gathers statistics about things that are measured
+	// ex.: tempature, time dilation
+{
+public:
+	LLStatMeasure(bool use_frame_timer = true);
+
+	void sample(F64);
+	void sample(S32 v) { sample((F64)v); }
+	void sample(U32 v) { sample((F64)v); }
+	void sample(S64 v) { sample((F64)v); }
+	void sample(U64 v) { sample((F64)v); }
+};
+
+
+class LLStatRate : public LLStatAccum
+	// gathers statistics about things that can be counted over time
+	// ex.: LSL instructions executed, messages sent, simulator frames completed
+	// renders it in terms of rate of thing per second
+{
+public:
+	LLStatRate(bool use_frame_timer = true);
+
+	void count(U32);
+		// used to note that n items have occured
+	
+	void mark() { count(1); }
+		// used for counting the rate thorugh a point in the code
+};
+
+
+class LLTimeBlock;
+
+class LLStatTime : public LLStatAccum
+	// gathers statistics about time spent in a block of code
+	// measure average duration per second in the block
+{
+public:
+	LLStatTime(bool use_frame_timer = false);
+
+private:
+	void start();
+	void stop();
+	friend class LLTimeBlock;
+};
+
+class LLTimeBlock
+{
+public:
+	LLTimeBlock(LLStatTime& stat) : mStat(stat) { mStat.start(); }
+	~LLTimeBlock()								{ mStat.stop(); }
+private:
+	LLStatTime& mStat;
+};
+
+
+
+
+
+class LLStat
+{
+public:
+	LLStat(const U32 num_bins = 32, BOOL use_frame_timer = FALSE);
+	~LLStat();
+
+	void reset();
+
+	void start();	// Start the timer for the current "frame", otherwise uses the time tracked from
+					// the last addValue
+	void addValue(const F32 value = 1.f); // Adds the current value being tracked, and tracks the DT.
+	void addValue(const S32 value) { addValue((F32)value); }
+	void addValue(const U32 value) { addValue((F32)value); }
+
+	void setBeginTime(const F64 time);
+	void addValueTime(const F64 time, const F32 value = 1.f);
+	
+	S32 getCurBin() const;
+	S32 getNextBin() const;
+	
+	F32 getCurrent() const;
+	F32 getCurrentPerSec() const;
+	F64 getCurrentBeginTime() const;
+	F64 getCurrentTime() const;
+	F32 getCurrentDuration() const;
+	
+	F32 getPrev(S32 age) const;				// Age is how many "addValues" previously - zero is current
+	F32 getPrevPerSec(S32 age) const;		// Age is how many "addValues" previously - zero is current
+	F64 getPrevBeginTime(S32 age) const;
+	F64 getPrevTime(S32 age) const;
+	
+	F32 getBin(S32 bin) const;
+	F32 getBinPerSec(S32 bin) const;
+	F64 getBinBeginTime(S32 bin) const;
+	F64 getBinTime(S32 bin) const;
+
+	F32 getMax() const;
+	F32 getMaxPerSec() const;
+	
+	F32 getMean() const;
+	F32 getMeanPerSec() const;
+	F32 getMeanDuration() const;
+
+	F32 getMin() const;
+	F32 getMinPerSec() const;
+	F32 getMinDuration() const;
+
+	F32 getSum() const;
+	F32 getSumDuration() const;
+
+	U32 getNumValues() const;
+	S32 getNumBins() const;
+
+	F64 getLastTime() const;
+private:
+	BOOL mUseFrameTimer;
+	U32 mNumValues;
+	U32 mNumBins;
+	F32 mLastValue;
+	F64 mLastTime;
+	F32 *mBins;
+	F64 *mBeginTime;
+	F64 *mTime;
+	F32 *mDT;
+	S32 mCurBin;
+	S32 mNextBin;
+	static LLTimer sTimer;
+	static LLFrameTimer sFrameTimer;
+};
+
+#endif // LL_STAT_