linux-kernel - Re: [linux-usb-devel] [PATCH] usbmon: add binary interface

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Message-ID: <Pine.LNX.4.44L0.0610111649440.6437-100000@iolanthe.rowland.org>
Date:	Wed, 11 Oct 2006 16:51:09 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Pete Zaitcev <zaitcev@...hat.com>
cc:	Pavel Machek <pavel@...e.cz>, <gregkh@...e.de>,
	Paolo Abeni <paolo.abeni@...il.it>,
	<linux-usb-devel@...ts.sourceforge.net>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] [PATCH] usbmon: add binary interface

On Wed, 11 Oct 2006, Pete Zaitcev wrote:

> On Wed, 11 Oct 2006 19:44:43 +0000, Pavel Machek <pavel@...e.cz> wrote:
> 
> > Does it mean text interface is now deprecated? Or perhaps ioctl should
> > be added to text interface too? Or maybe we do not need binary
> > interface if we allow resizing on text interface?
> 
> I haven't reviewed Paolo's patch yet, but with that in mind:
>  - No, text is not deprecated yet. That is only possible when a simplified
>    command-line tool is written and distributed (e.g. usbmon(8)).
>  - No, I do not think an ioctl in debugfs or a text API is a good idea.
>  - Resizing on text interface magnifies sprintf contribution to CPU burn,
>    so once we have the binary one, there's only disadvantage and
>    no advantage in implementing that.

Would relayfs be a better choice than debugfs for exporting potentially
large quantities of binary data?

Alan Stern

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