linux-kernel - Re: [PATCH] Use tty

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Message-Id: <1178656361.14867.7.camel@x2.microgate.com>
Date:	Tue, 08 May 2007 15:32:41 -0500
From:	Paul Fulghum <paulkf@...rogate.com>
To:	James Simmons <jsimmons@...radead.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux console project <linuxconsole-dev@...ts.sourceforge.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] Use tty_schedule in VT code.

On Tue, 2007-05-08 at 21:10 +0100, James Simmons wrote:
> 
> This patch has the VT subsystem use tty_schedule_flip instead of 
> con_schedule_flip. There are two ways we can approach this. We can
> do the below path or extend tty_schedule_flip to accept a time field.
> Comments welcomed.

This looks reasonable.

I don't think a time field is necessary. In fact, I think the
scheduled_delayed_work() in tty_schedule_flip() should use a
time of 0 just like con_schedule_flip().

As the tty flip buffer code has evolved, that delay value of 1
was carried along. It may have had some historical purpose, but
I can't figure it out and it appears to have no use currently.

It would be better for performance to process the receive data
as soon as possible (delay value of 0).

--
Paul Fulghum
Microgate Systems, Ltd

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