linux-kernel - Re: [PATCH] mac80211_hwsim: use dyndbg for debug messages

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Date:   Wed, 28 Jun 2017 12:23:36 -0700
From:   Joe Perches <joe@...ches.com>
To:     Lubomir Rintel <lkundrak@...sk>,
        Johannes Berg <johannes@...solutions.net>
Cc:     Kalle Valo <kvalo@...eaurora.org>, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mac80211_hwsim: use dyndbg for debug messages

On Wed, 2017-06-28 at 21:10 +0200, Lubomir Rintel wrote:
> On Wed, 2017-06-28 at 17:02 +0200, Johannes Berg wrote:
> > On Wed, 2017-06-28 at 15:17 +0200, Lubomir Rintel wrote:
> > > The mac80211_hwsim doesn't offer a way to disable the debugging
> > > output.
> > > Unfortunately, it's pretty chatty, dumping a  lot of stuff into the
> > > message buffer.
> > 
> > Why is this a problem? It's pretty much a testing tool only, and much
> > of the point is to have message about it's internal state?
> 
> I do use it as a development tool. I find it very convenient to always
> have a bunch of libvirt-managed LXC containers, some running hostapd
> instances with various access point configurations and some used for
> NetworkManager development and a mac80211_hwsim radio in each of them.
> 
> An unfortunate side-effect is that my dmesg becomes next to useless due
> to the overwhelming amount of mac80211_hwsim logging.

Perhaps convert some of these to debugfs output?

Otherwise, many or most of these seem to be function
tracing type calls that could or should use ftrace.