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From: Randy Dunlap <randy.dunlap@oracle.com>
To: Ben Pfaff <blp@cs.stanford.edu>
Cc: Bruno Randolf <br1@einfach.org>,
	linux-kernel@vger.kernel.org, akpm <akpm@linux-foundation.org>
Subject: Re: [PATCH] Add generic exponentially weighted moving average function
Date: Fri, 15 Oct 2010 07:41:08 -0700	[thread overview]
Message-ID: <4CB86804.7090600@oracle.com> (raw)
In-Reply-To: <87y6a0unrr.fsf@benpfaff.org>

On 10/14/10 20:40, Ben Pfaff wrote:
> Randy Dunlap <randy.dunlap@oracle.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

Thanks, nice writeup.

-- 
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***

  reply	other threads:[~2010-10-15 14:42 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-06  9:32 Bruno Randolf
2010-10-13  0:33 ` Randy Dunlap
2010-10-13  2:10   ` Bruno Randolf
2010-10-13 16:33     ` Randy Dunlap
2010-10-15  3:40   ` Ben Pfaff
2010-10-15 14:41     ` Randy Dunlap [this message]
2010-10-13 14:01 ` kevin granade
2010-10-14  1:19   ` Bruno Randolf
2010-10-15 13:55     ` kevin granade
2010-10-18  3:27       ` Bruno Randolf

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