linux-kernel - Re: [PATCH] detour TTY driver

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Message-ID: <20100825181108.1dcd0d80@lxorguk.ukuu.org.uk>
Date:	Wed, 25 Aug 2010 18:11:08 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Greg KH <gregkh@...e.de>
Cc:	Kay Sievers <kay.sievers@...y.org>,
	Samo Pogacnik <samo_pogacnik@....net>,
	linux kernel <linux-kernel@...r.kernel.org>,
	linux-embedded <linux-embedded@...r.kernel.org>
Subject: Re: [PATCH] detour TTY driver - now ttyprintk

> Would that work for this driver in use as a console?

Yes

>   exec < /dev/console > /dev/kmsg 2>&1
> 
> That's one extra process, not that much, right?

About 150K or so way too much and its not robust.

> > You also want errors to get out (or stored) even if there are crashes -
> > which the Fedora one is not very good at. To be fair in the Fedora world
> > its not a big deal to say 'Oh dear, boot with ....'. Embedded isn't the
> > same, and you want to capture the odd rare error reliably.
> 
> again, the above exec line should work for what the embedded people
> want, right?

We didn't *need* devtmpfs either - that was a little bit of user space.
It's a similar thing - you can do the job better in 1.5K of kernel code
than 150K or more of user space - which is not trivial on a box with no
swap.

Alan
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