netdev - Re: [PATCH 1/2] average: provide macro to create static EWMA

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Message-Id: <20150813.172655.794541030036505262.davem@davemloft.net>
Date:	Thu, 13 Aug 2015 17:26:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	johannes@...solutions.net
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	johannes.berg@...el.com
Subject: Re: [PATCH 1/2] average: provide macro to create static EWMA

From: Johannes Berg <johannes@...solutions.net>
Date: Thu, 13 Aug 2015 11:11:48 +0200

> From: Johannes Berg <johannes.berg@...el.com>
> 
> Having the EWMA parameters stored in the runtime struct imposes
> memory requirements for the constant values that could just be
> inlined in the code. This particularly makes sense if there are
> a lot of such structs, for example in mac80211 in the station
> table where each station has a number of these in an array, and
> there can be many stations.
> 
> Provide a macro DECLARE_EWMA() that declares the necessary struct
> and inline functions to access it with the parameters hard-coded;
> using this also means the user no longer needs to 'select AVERAGE'
> as it's entirely self-contained.
> 
> In the mac80211 case, on x86-64, this actually slightly *reduces*
> code size, while also saving 80 bytes of runtime memory per sta.
> 
> Signed-off-by: Johannes Berg <johannes.berg@...el.com>
> ---
> As the next patch relies on this, I'll take this through my tree
> unless I hear objections.

This looks fine to me.
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