linux-kernel - Re: [PATCH] Add generic exponentially weighted moving average function

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Message-ID: <87y6a0unrr.fsf@benpfaff.org>
Date:	Thu, 14 Oct 2010 20:40:24 -0700
From:	Ben Pfaff <blp@...stanford.edu>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Bruno Randolf <br1@...fach.org>, linux-kernel@...r.kernel.org,
	akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Add generic exponentially weighted moving average function

Randy Dunlap <randy.dunlap@...cle.com> writes:

> On Wed, 06 Oct 2010 18:32:25 +0900 Bruno Randolf wrote:
>
>> This adds a generic exponentially weighted moving average function. This
>> implementation makes use of a structure which keeps a scaled up internal
>> representation to reduce rounding errors.
>> 
>> The idea for this implementation comes from the rt2x00 driver (rt2x00link.c)
>> and i would like to use it in several places in the mac80211 and ath5k code.
>
> I guess I don't understand "exponentially weighted" or why that would
> be desirable.  Please try to explain (briefly).

I wrote up a fairly non-brief explanation of exponentially
weighted moving averages a few years ago:
        http://www.stanford.edu/class/cs140/projects/pintos/pintos_7.html#SEC134
-- 
Ben Pfaff 
http://benpfaff.org
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